Release 0.26.1

maintenance release, rolling up all the version updates.

Signed-off-by: Matthias Rampke <matthias@prometheus.io>

.circleci/config.yml

@@ -1,115 +1,48 @@
----
 version: 2.1
-
+orbs:
+  prometheus: prometheus/prometheus@0.17.1
 executors:
-  # Whenever the Go version is updated here, .travis.yml and .promu.yml
-  # should also be updated.
+  # Whenever the Go version is updated here, .promu.yml should also be updated.
   golang:
     docker:
-    - image: circleci/golang:1.11
-
+      - image: cimg/go:1.21
 jobs:
   test:
     executor: golang
-
     steps:
-    - checkout
-    - run: make promu
-    - run: make
-    - run: git diff --exit-code
-    - store_artifacts:
-        path: statsd_exporter
-        destination: /build/statsd_exporter
-    - run: rm -v statsd_exporter
-
-  build:
-    machine: true
-
-    steps:
-    - checkout
-    - run: make promu
-    - run: promu crossbuild -v
-    - persist_to_workspace:
-        root: .
-        paths:
-        - .build
-    - store_artifacts:
-        path: .build
-        destination: /build
-
-  docker_hub_master:
-    executor: golang
-
-    steps:
-    - checkout
-    - setup_remote_docker
-    - attach_workspace:
-        at: .
-    - run: ln -s .build/linux-amd64/statsd_exporter statsd_exporter
-    - run: make docker
-    - run: make docker DOCKER_REPO=quay.io/prometheus
-    - run: docker images
-    - run: docker login -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
-    - run: docker login -u $QUAY_LOGIN -p $QUAY_PASSWORD quay.io
-    - run: make docker-publish
-    - run: make docker-publish DOCKER_REPO=quay.io/prometheus
-
-  docker_hub_release_tags:
-    executor: golang
-
-    steps:
-    - checkout
-    - setup_remote_docker
-    - run: mkdir -v -p ${HOME}/bin
-    - run: curl -L 'https://github.com/aktau/github-release/releases/download/v0.7.2/linux-amd64-github-release.tar.bz2' | tar xvjf - --strip-components 3 -C ${HOME}/bin
-    - run: echo 'export PATH=${HOME}/bin:${PATH}' >> ${BASH_ENV}
-    - attach_workspace:
-        at: .
-    - run: make promu
-    - run: promu crossbuild tarballs
-    - run: promu checksum .tarballs
-    - run: promu release .tarballs
-    - store_artifacts:
-        path: .tarballs
-        destination: releases
-    - run: ln -s .build/linux-amd64/statsd_exporter statsd_exporter
-    - run: make docker DOCKER_IMAGE_TAG=$CIRCLE_TAG
-    - run: make docker DOCKER_IMAGE_TAG=$CIRCLE_TAG DOCKER_REPO=quay.io/prometheus
-    - run: docker login -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
-    - run: docker login -u $QUAY_LOGIN -p $QUAY_PASSWORD quay.io
-    - run: |
-        if [[ "$CIRCLE_TAG" =~ ^v[0-9]+(\.[0-9]+){2}$ ]]; then
-          make docker-tag-latest DOCKER_IMAGE_TAG="$CIRCLE_TAG"
-          make docker-tag-latest DOCKER_IMAGE_TAG="$CIRCLE_TAG" DOCKER_REPO=quay.io/prometheus
-        fi
-    - run: make docker-publish
-    - run: make docker-publish DOCKER_REPO=quay.io/prometheus
-
+      - prometheus/setup_environment
+      - run: make
+      - run: git diff --exit-code
+      - prometheus/store_artifact:
+          file: statsd_exporter
 workflows:
   version: 2
   statsd_exporter:
     jobs:
-    - test:
-        filters:
-          tags:
-            only: /.*/
-    - build:
-        filters:
-          tags:
-            only: /.*/
-    - docker_hub_master:
-        requires:
-        - test
-        - build
-        filters:
-          branches:
-            only: master
-    - docker_hub_release_tags:
-        requires:
-        - test
-        - build
-        filters:
-          tags:
-            only: /^v[0-9]+(\.[0-9]+){2}(-.+|[^-.]*)$/
-          branches:
-            ignore: /.*/
+      - test:
+          filters:
+            tags:
+              only: /.*/
+      - prometheus/build:
+          name: build
+          filters:
+            tags:
+              only: /.*/
+      - prometheus/publish_master:
+          context: org-context
+          requires:
+            - test
+            - build
+          filters:
+            branches:
+              only: master
+      - prometheus/publish_release:
+          context: org-context
+          requires:
+            - test
+            - build
+          filters:
+            tags:
+              only: /^v[0-9]+(\.[0-9]+){2}(-.+|[^-.]*)$/
+            branches:
+              ignore: /.*/

.dockerignore

@@ -2,3 +2,5 @@
 .tarballs/
 
 !.build/linux-amd64
+!.build/linux-armv7
+!.build/linux-arm64

.gitattributes

@@ -0,0 +1,4 @@
+# Managing line ending conversions
+# See http://git-scm.com/docs/gitattributes#_end-of-line_conversion
+* text=auto
+* eol=lf

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/container_description.yml

@@ -0,0 +1,52 @@
+---
+name: Push README to Docker Hub
+on:
+  push:
+    paths:
+      - "README.md"
+      - ".github/workflows/container_description.yml"
+    branches: [ main, master ]
+
+permissions:
+  contents: read
+
+jobs:
+  PushDockerHubReadme:
+    runs-on: ubuntu-latest
+    name: Push README to Docker Hub
+    if: github.repository_owner == 'prometheus' || github.repository_owner == 'prometheus-community' # Don't run this workflow on forks.
+    steps:
+      - name: git checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: Set docker hub repo name
+        run: echo "DOCKER_REPO_NAME=$(make docker-repo-name)" >> $GITHUB_ENV
+      - name: Push README to Dockerhub
+        uses: christian-korneck/update-container-description-action@d36005551adeaba9698d8d67a296bd16fa91f8e8 # v1
+        env:
+          DOCKER_USER: ${{ secrets.DOCKER_HUB_LOGIN }}
+          DOCKER_PASS: ${{ secrets.DOCKER_HUB_PASSWORD }}
+        with:
+          destination_container_repo: ${{ env.DOCKER_REPO_NAME }}
+          provider: dockerhub
+          short_description: ${{ env.DOCKER_REPO_NAME }}
+          readme_file: 'README.md'
+
+  PushQuayIoReadme:
+    runs-on: ubuntu-latest
+    name: Push README to quay.io
+    if: github.repository_owner == 'prometheus' || github.repository_owner == 'prometheus-community' # Don't run this workflow on forks.
+    steps:
+      - name: git checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: Set quay.io org name
+        run: echo "DOCKER_REPO=$(echo quay.io/${GITHUB_REPOSITORY_OWNER} | tr -d '-')" >> $GITHUB_ENV
+      - name: Set quay.io repo name
+        run: echo "DOCKER_REPO_NAME=$(make docker-repo-name)" >> $GITHUB_ENV
+      - name: Push README to quay.io
+        uses: christian-korneck/update-container-description-action@d36005551adeaba9698d8d67a296bd16fa91f8e8 # v1
+        env:
+          DOCKER_APIKEY: ${{ secrets.QUAY_IO_API_TOKEN }}
+        with:
+          destination_container_repo: ${{ env.DOCKER_REPO_NAME }}
+          provider: quay
+          readme_file: 'README.md'

.github/workflows/golangci-lint.yml

@@ -0,0 +1,38 @@
+---
+# This action is synced from https://github.com/prometheus/prometheus
+name: golangci-lint
+on:
+  push:
+    paths:
+      - "go.sum"
+      - "go.mod"
+      - "**.go"
+      - "scripts/errcheck_excludes.txt"
+      - ".github/workflows/golangci-lint.yml"
+      - ".golangci.yml"
+  pull_request:
+
+permissions:  # added using https://github.com/step-security/secure-repo
+  contents: read
+
+jobs:
+  golangci:
+    permissions:
+      contents: read  # for actions/checkout to fetch code
+      pull-requests: read  # for golangci/golangci-lint-action to fetch pull requests
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: install Go
+        uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
+        with:
+          go-version: 1.22.x
+      - name: Install snmp_exporter/generator dependencies
+        run: sudo apt-get update && sudo apt-get -y install libsnmp-dev
+        if: github.repository == 'prometheus/snmp_exporter'
+      - name: Lint
+        uses: golangci/golangci-lint-action@3cfe3a4abbb849e10058ce4af15d205b6da42804 # v4.0.0
+        with:
+          version: v1.56.2

.gitignore

@@ -4,3 +4,5 @@ dependencies-stamp
 /.deps
 /.release
 /.tarballs
+*~
+/vendor

.gitpod.Dockerfile

@@ -0,0 +1,6 @@
+FROM gitpod/workspace-full
+
+RUN sudo apt-get update && \
+    sudo apt-get install -y netcat-traditional socat && \
+    sudo apt-get clean && \
+    sudo rm -rf /var/lib/apt/lists/*

.gitpod.yml

@@ -0,0 +1,13 @@
+tasks:
+  - init: go get
+    command: go build . && ./statsd_exporter
+  - command: printf 'Try:\n\n\techo "test.gauge:42|g" | socat - TCP:127.0.0.1:9125\n\n'
+
+ports:
+  - port: 9102
+    onOpen: open-preview
+  - port: 9125
+    onOpen: ignore
+
+image:
+  file: .gitpod.Dockerfile

.golangci.yml

@@ -0,0 +1,27 @@
+run:
+  issues-exit-code: 1
+  tests: true
+linters:
+  disable:
+    - errcheck
+  enable:
+    - deadcode
+    - goimports
+    - gosimple
+    - govet
+    - ineffassign
+    - nakedret
+    - staticcheck
+    - structcheck
+    - unused
+    - varcheck
+    - whitespace
+linters-settings:
+  govet:
+    check-shadowing: true
+issues:
+  exclude-use-default: false
+  exclude:
+    - 'shadow: declaration of "err" shadows declaration at line (\d+)'
+  max-issues-per-linter: 0
+  max-same-issues: 0

.promu.yml

@@ -1,11 +1,10 @@
 go:
-    # Whenever the Go version is updated here, .travis.yml and
-    # .circle/config.yml should also be updated.
-    version: 1.11
+    # Whenever the Go version is updated here, .circle/config.yml should also
+    # be updated.
+    version: 1.21
 repository:
     path: github.com/prometheus/statsd_exporter
 build:
-    flags: -mod=vendor -a -tags 'netgo static_build'
     ldflags: |
         -X github.com/prometheus/common/version.Version={{.Version}}
         -X github.com/prometheus/common/version.Revision={{.Revision}}

.travis.yml

@@ -1,13 +0,0 @@
-sudo: false
-
-language: go
-# Whenever the Go version is updated here, .circleci/config.yml and .promu.yml
-# should also be updated.
-go:
-- 1.11.x
-
-go_import_path: github.com/prometheus/statsd_exporter
-
-script:
-- make
-- git diff --exit-code

.yamllint

@@ -0,0 +1,25 @@
+---
+extends: default
+ignore: |
+  ui/react-app/node_modules
+
+rules:
+  braces:
+    max-spaces-inside: 1
+    level: error
+  brackets:
+    max-spaces-inside: 1
+    level: error
+  commas: disable
+  comments: disable
+  comments-indentation: disable
+  document-start: disable
+  indentation:
+    spaces: consistent
+    indent-sequences: consistent
+  key-duplicates:
+    ignore: |
+      config/testdata/section_key_dup.bad.yml
+  line-length: disable
+  truthy:
+    check-keys: false

CHANGELOG.md

@@ -1,4 +1,332 @@
-## v0.9.0 / 2019-03-11
+## 0.26.1 / 2024-03-22
+
+* [SECURITY] Update dependencies, including `google.golang.org/protobuf` for CVE-2024-24786
+
+This is a maintenance release.
+
+## 0.26.0 / 2023-12-06
+
+* [CHANGE] Update dependencies: prometheus/common, client model, and Go 1.21
+* [FEATURE] Add option to honor original labels from event tags over labels specified in mapping configuration ([#521](https://github.com/prometheus/statsd_exporter/pull/521))
+
+Thank you @rabenhorst for the `honor_labels` contribution!
+
+## 0.25.0 / 2023-10-23
+
+* [CHANGE] Update `client_golang` ([#508](https://github.com/prometheus/statsd_exporter/pull/508), [#513](https://github.com/prometheus/statsd_exporter/pull/513))
+* [ENHANCEMENT] Process UDP packets asynchronously ([#511](https://github.com/prometheus/statsd_exporter/pull/511))
+* [BUGFIX] Debug-log incoming lines in cleartext ([#510](https://github.com/prometheus/statsd_exporter/pull/510))
+* [SECURITY] Update `golang.org/x/net` ([#516](https://github.com/prometheus/statsd_exporter/pull/516))
+
+This release is less likely to drop UDP packets under very high traffic.
+Additionally, when it does, it now attempts to record that this happened in the metric `statsd_exporter_udp_packet_drops_total`, where previously this could only be detected from operating system metrics.
+If you are already monitoring for OS-level UDP packet drops, you _must_ also monitor this metric.
+The exporter will pull packets from the UDP socket queue much more quickly and queue them internally before processing.
+Existing monitoring for packet drops will no longer be sufficient to detect dropped events, but attribution to the exporter is easier with this new metric.
+
+Many thanks to @sumeshpremraj and @kullanici0606 for their contributions, and @pedro-stanaka for helping with the async UDP processing!
+
+## 0.24.0 / 2023-06-02
+
+* [FEATURE] Improve the landing page experience ([#504](https://github.com/prometheus/statsd_exporter/pull/504))
+* [FEATURE] Support scaling parameter in mapping ([#499](https://github.com/prometheus/statsd_exporter/pull/499))
+
+## 0.23.3 / 2023-06-02
+
+* [SECURITY] Maintenance release, updating dependencies
+* [ENHANCEMENT][library] Allow instantiating configuration without going through YAML ([#491](https://github.com/prometheus/statsd_exporter/pull/491))
+
+Version 0.23.2 was mistagged and thus skipped.
+
+## 0.23.1 / 2023-03-08
+
+* [SECURITY] Update all dependencies ([#489](https://github.com/prometheus/statsd_exporter/pull/489))
+
+## 0.23.0 / 2022-12-07
+
+* [CHANGE] Print help and version to standard out ([#469](https://github.com/prometheus/statsd_exporter/pull/469))
+* [FEATURE] Support experimental native histograms ([#474](https://github.com/prometheus/statsd_exporter/pull/474))
+
+## 0.22.8 / 2022-09-13
+
+* [BUGFIX] Prevent poisoning with gauge/distribution naming collision ([#461](https://github.com/prometheus/statsd_exporter/pull/461))
+* [CHANGE] Update `client_golang` dependency ([#463](https://github.com/prometheus/statsd_exporter/pull/463))
+
+## 0.22.7 / 2022-07-08
+
+* [CHANGE] Build with Go 1.18 ([#450](https://github.com/prometheus/statsd_exporter/pull/450))
+
+## 0.22.6 / 2022-07-08
+
+* [CHANGE] Update dependencies ([#449](https://github.com/prometheus/statsd_exporter/pull/449))
+
+This is another housekeeping release.
+
+## 0.22.5 / 2022-05-06
+
+* [ENHANCEMENT] Add metric for total lines relayed ([#434](https://github.com/prometheus/statsd_exporter/pull/434))
+
+This release is built with Go 1.17.9, to address security issues in Go.
+
+## 0.22.4 / 2021-11-26
+
+* [BUGFIX] Make Docker image compatible with the runAsNonRoot setting in Kubernetes pods ([#409](https://github.com/prometheus/statsd_exporter/pull/409))
+* [BUGFIX] Library: fix support for custom Registerers with histograms and summaries ([#410](https://github.com/prometheus/statsd_exporter/pull/410))
+
+## 0.22.3 / 2021-10-26
+
+* [BUGFIX] Accept metrics with multiple dashes even if not mapped ([#402](https://github.com/prometheus/statsd_exporter/pull/402))
+
+## 0.22.2 / 2021-09-10
+
+* [ENHANCEMENT] Add metrics to relay ([#393](https://github.com/prometheus/statsd_exporter/pull/393))
+
+## 0.22.1 / 2021-09-01
+
+* [ENHANCEMENT] Accept incoming metrics with multiple dashes (with mapping) ([#381](https://github.com/prometheus/statsd_exporter//pull/381))
+* [ENHANCEMENT] Allow forwarding messages to statsd for easier transition ([#388](https://github.com/prometheus/statsd_exporter/pull/388))
+* [BUGFIX] Actually expose pprof endpoints ([#386](https://github.com/prometheus/statsd_exporter/pull/386))
+* [BUGFIX] Fix performance regression on metric ingestion ([#390](https://github.com/prometheus/statsd_exporter/pull/390))
+
+## 0.21.0 / 2021-06-10
+
+* [ENHANCEMENT] Update dependencies & switch to go-kit/log ([#379](https://github.com/prometheus/statsd_exporter/pull/379))
+
+This release changes the log format to be more structured, in line with other Prometheus projects.
+
+## 0.20.3 / 2021-06-04
+
+* [ENHANCEMENT] Use extracted go-kit/log to reduce transitive dependencies ([#378](https://github.com/prometheus/statsd_exporter/pull/378))
+
+Once again there is no functional change.
+For library users, the dependency tree shrinks considerably.
+See [prometheus/common#255](https://github.com/prometheus/common/issues/255) for more details.
+
+## 0.20.2 / 2021-05-03
+
+* [BUGFIX] Remove copyleft licensed dependency ([#375](https://github.com/prometheus/statsd_exporter/pull/375))
+
+There is no functional change for exporter users.
+Removing this dependency reduces uncertainty for anyone reusing the mapping code.
+
+## 0.20.1 / 2021-03-26
+
+* [CHANGE] [library] Split mapper caches out from mapper ([#363](https://github.com/prometheus/statsd_exporter/pull/363))
+* [BUGFIX] Accept metric segments that start with numbers ([#365](https://github.com/prometheus/statsd_exporter/pull/365))
+
+## 0.20.0 / 2021-02-05
+
+* [ENHANCEMENT] Support full defaults for summaries and histograms ([#361](https://github.com/prometheus/statsd_exporter/pull/361))
+
+This completes support for `summary_options` and `histogram_options`.
+Change the legacy configuration attributes throughout the mapping configuration as follows:
+
+* `quantiles: …` to `summary_options: { quantiles: … }`
+* `buckets: …` to `histogram_options: { buckets: … }`
+* `timer_type` to `observer_type`.
+
+Support for the deprecated attributes will be removed in a future release.
+
+## 0.19.1 / 2021-01-29
+
+* [BUGFIX] Don't return empty responses to lifecycle api requests ([#360](https://github.com/prometheus/statsd_exporter/pull/360))
+
+## 0.19.0 / 2021-01-22
+
+* [CHANGE] [library] Require explicit Registerer ([#347](https://github.com/prometheus/statsd_exporter/pull/347))
+* [ENHANCEMENT] Add /-/healthy and /-/ready endpoints ([#339](https://github.com/prometheus/statsd_exporter/pull/339))
+* [BUGFIX] Do not open network ports when only checking config ([#357](https://github.com/prometheus/statsd_exporter/pull/357))
+
+## 0.18.0 / 2020-08-21
+
+* [ENHANCEMENT] Allow turning off tagging extensions ([#325](https://github.com/prometheus/statsd_exporter/pull/325))
+* [ENHANCEMENT] Add a lifecycle API for configuration reloads and restarts ([#329](https://github.com/prometheus/statsd_exporter/pull/329))
+
+This release changes the interface for the [`github.com/prometheus/statsd_exporter/pkg/line` library package](https://pkg.go.dev/github.com/prometheus/statsd_exporter@v0.18.0/pkg/line?tab=doc) to support the new configurability.
+
+## 0.17.0 / 2020-06-26
+
+* [CHANGE] Support non-timer distributions without unit conversion ([#314](https://github.com/prometheus/statsd_exporter/pull/314))
+* [ENHANCEMENT] Offline configuration check ([#312](https://github.com/prometheus/statsd_exporter/pull/312))
+* [ENHANCEMENT] Support the SignalFX tagging extension ([#315](https://github.com/prometheus/statsd_exporter/pull/315))
+* [BUGFIX] Allow matching single-letter metric name components ([#309](https://github.com/prometheus/statsd_exporter/pull/309))
+
+Distribution and histogram events (type `d`, `h`) are now treated as distinct from timer events (type `ms`).
+Their values are observed as they are, while timer events are converted from milliseconds to seconds.
+
+To reflect this generalization, the `observer_type` mapping option replaces `timer_type`.
+Similary, change `match_metric_type: timer` to `match_metric_type: observer`.
+The old name remains available for compatibility.
+
+For users of the mapper library, the `ObserverEvent` replaces `TimerEvent`.
+For timer metrics, it is emitted by the mapper already converted to seconds.
+
+## 0.16.0 / 2020-05-29
+
+* [CHANGE] Break out much of the exporter into reusable packages ([#298](https://github.com/prometheus/statsd_exporter/pull/298))
+* [ENHANCEMENT] Log ingested lines at debug level ([#305](https://github.com/prometheus/statsd_exporter/pull/305))
+
+This release mainly consists of an internal reorganization of the exporter.
+This should not have any impact on users of the binary, if it does, please file
+an issue.
+
+For users of the existing library packages, nothing changes.
+
+There are now multiple new packages available, exposing functionality that had
+been locked away in the main package. Consider the interfaces of these
+libraries preliminary; we will change them as we gain experience in how they
+are used.
+
+## 0.15.0 / 2020-03-05
+
+* [ENHANCEMENT] Allow setting granularity for summary metrics ([#290](https://github.com/prometheus/statsd_exporter/pull/290))
+* [ENHANCEMENT] Support a random-replacement cache invalidation strategy ([#281](https://github.com/prometheus/statsd_exporter/pull/281)
+
+To facilitate the expanded settings for summaries, the configuration format changes from
+
+```yaml
+mappings:
+- match: …
+  timer_type: summary
+  quantiles:
+    - quantile: 0.99
+      error: 0.001
+    - quantile: 0.95
+      error: 0.01
+  …
+```
+
+to
+
+```yaml
+mappings:
+- match: …
+  timer_type: summary
+  summary_options:
+    quantiles:
+      - quantile: 0.99
+        error: 0.001
+      - quantile: 0.95
+        error: 0.01
+      …
+    max_summary_age: 30s
+    summary_age_buckets: 3
+    stream_buffer_size: 1000
+  …
+```
+
+For consistency, the format for histogram buckets also changes from
+
+```yaml
+mappings:
+- match: …
+  timer_type: histogram
+  buckets: [ 0.01, 0.025, 0.05, 0.1 ]
+```
+
+to
+
+```yaml
+mappings:
+- match: …
+  timer_type: histogram
+  histogram_options:
+    buckets: [ 0.01, 0.025, 0.05, 0.1 ]
+```
+
+Transitionally, the old format will still work but is *deprecated*. The new
+settings are optional.
+
+For users of the [mapper](https://pkg.go.dev/github.com/prometheus/statsd_exporter/pkg/mapper?tab=doc)
+as a library, this is a breaking change. To adjust your code, replace
+`mapping.Buckets` with `mapping.HistogramOptions.Buckets` and
+`mapping.Quantiles` with `mapping.SummaryOptions.Quantiles`.
+
+## 0.14.1 / 2020-01-13
+
+* [BUGFIX] Mapper cache poisoning when name is variable ([#286](https://github.com/prometheus/statsd_exporter/pull/286))
+* [BUGFIX] nil pointer dereference in UDP listener ([#287](https://github.com/prometheus/statsd_exporter/pull/287))
+
+Thank you to everyone who reported these, and @bakins for the mapper cache fix!
+
+## 0.14.0 / 2020-01-10
+
+* [CHANGE] Switch logging to go-kit ([#283](https://github.com/prometheus/statsd_exporter/pull/283))
+* [CHANGE] Rename existing metric for mapping cache size ([#284](https://github.com/prometheus/statsd_exporter/pull/284))
+* [ENHANCEMENT] Add metrics for mapping cache hits ([#280](https://github.com/prometheus/statsd_exporter/pull/280))
+
+Logs are more structured now. The `fatal` log level no longer exists; use `--log.level=error` instead. The valid log formats are `logfmt` and `json`.
+
+The metric `statsd_exporter_cache_length` is now called `statsd_metric_mapper_cache_length`.
+
+## 0.13.0 / 2019-12-06
+
+* [ENHANCEMENT] Support sampling factors for all statsd metric types ([#264](https://github.com/prometheus/statsd_exporter/issues/250))
+* [ENHANCEMENT] Support Librato and InfluxDB labeling formats ([#267](https://github.com/prometheus/statsd_exporter/pull/267))
+
+## 0.12.2 / 2019-07-25
+
+* [BUGFIX] Fix Unix socket handler ([#252](https://github.com/prometheus/statsd_exporter/pull/252))
+* [BUGFIX] Fix panic under high load ([#253](https://github.com/prometheus/statsd_exporter/pull/253))
+
+Thank you to everyone who reported and helped debug these issues!
+
+## 0.12.1 / 2019-07-08
+
+* [BUGFIX] Renew TTL when a metric receives updates ([#246](https://github.com/prometheus/statsd_exporter/pull/246))
+* [CHANGE] Reload on SIGHUP instead of watching the file ([#243](https://github.com/prometheus/statsd_exporter/pull/243))
+
+## 0.11.2 / 2019-06-14
+
+* [BUGFIX] Fix TCP handler ([#235](https://github.com/prometheus/statsd_exporter/pull/235))
+
+## 0.11.1 / 2019-06-14
+
+* [ENHANCEMENT] Batch event processing for improved ingestion performance ([#227](https://github.com/prometheus/statsd_exporter/pull/227))
+* [ENHANCEMENT] Switch Prometheus client to promhttp, freeing the standard HTTP metrics ([#233](https://github.com/prometheus/statsd_exporter/pull/233))
+
+With #233, the exporter no longer exports metrics about its own HTTP status. These were not helpful since you could not get them when scraping fails. This allows mapping to metric names like `http_requests_total` that are useful as application metrics.
+
+## 0.10.6 / 2019-06-07
+
+* [BUGFIX] Fix mapping collision for metrics with different types, but the same name ([#229](https://github.com/prometheus/statsd_exporter/pull/229))
+
+## 0.10.5 / 2019-05-27
+
+* [BUGFIX] Fix "Error: inconsistent label cardinality: expected 0 label values but got N in prometheus.Labels" ([#224](https://github.com/prometheus/statsd_exporter/pull/224))
+
+## 0.10.4 / 2019-05-20
+
+* [BUGFIX] Revert #218 due to a race condition ([#221](https://github.com/prometheus/statsd_exporter/pull/221))
+
+## 0.10.3 / 2019-05-17
+
+* [ENHANCEMENT] Reduce allocations when escaping metric names ([#217](https://github.com/prometheus/statsd_exporter/pull/217))
+* [ENHANCEMENT] Reduce allocations when handling packets ([#218](https://github.com/prometheus/statsd_exporter/pull/218))
+* [ENHANCEMENT] Optimize label sorting ([#219](https://github.com/prometheus/statsd_exporter/pull/219))
+
+This release is entirely powered by @claytono. Kudos!
+
+## 0.10.2 / 2019-05-17
+
+* [CHANGE] Do not run as root in the Docker container by default ([#202](https://github.com/prometheus/statsd_exporter/pull/202))
+* [FEATURE] Add metric for count of events by action ([#193](https://github.com/prometheus/statsd_exporter/pull/193))
+* [FEATURE] Add metric for count of distinct metric names ([#200](https://github.com/prometheus/statsd_exporter/pull/200))
+* [FEATURE] Add UNIX socket listener support ([#199](https://github.com/prometheus/statsd_exporter/pull/199))
+* [FEATURE] Accept Datadog [distributions](https://docs.datadoghq.com/graphing/metrics/distributions/) ([#211](https://github.com/prometheus/statsd_exporter/pull/211))
+* [ENHANCEMENT] Add a health check to the Docker container ([#182](https://github.com/prometheus/statsd_exporter/pull/182))
+* [ENHANCEMENT] Allow inconsistent label sets ([#194](https://github.com/prometheus/statsd_exporter/pull/194))
+* [ENHANCEMENT] Speed up sanitization of metric names ([#197](https://github.com/prometheus/statsd_exporter/pull/197))
+* [ENHANCEMENT] Enable pprof endpoints ([#205](https://github.com/prometheus/statsd_exporter/pull/205))
+* [ENHANCEMENT] DogStatsD tag parsing is faster ([#210](https://github.com/prometheus/statsd_exporter/pull/210))
+* [ENHANCEMENT] Cache mapped metrics ([#198](https://github.com/prometheus/statsd_exporter/pull/198))
+* [BUGFIX] Fix panic if a mapping resulted in an empty name ([#192](https://github.com/prometheus/statsd_exporter/pull/192))
+* [BUGFIX] Ensure that there are always default quantiles if using summaries ([#212](https://github.com/prometheus/statsd_exporter/pull/212))
+* [BUGFIX] Prevent ingesting conflicting metric types that would make scraping fail ([#213](https://github.com/prometheus/statsd_exporter/pull/213))
+
+With #192, the count of events rejected because of negative counter increments has moved into the `statsd_exporter_events_error_total` metric, instead of being lumped in with the different kinds of successful events.
+
+## 0.9.0 / 2019-03-11
 
 * [ENHANCEMENT] Update the Prometheus client library to 0.9.2 ([#171](https://github.com/prometheus/statsd_exporter/pull/171))
 * [FEATURE] Metrics can now be expired with a per-mapping TTL ([#164](https://github.com/prometheus/statsd_exporter/pull/164))
@@ -7,12 +335,12 @@
 If you are using summaries, all your quantiles and `_total` will change by a factor of 1000.
 Adjust your queries and dashboards, or consider switching to histograms altogether.
 
-## v0.8.1 / 2018-12-05
+## 0.8.1 / 2018-12-05
 
 * [BUGFIX] Expose the counter for unmapped matches ([#161](https://github.com/prometheus/statsd_exporter/pull/161))
 * [BUGFIX] Unsuccessful backtracking does not clobber captures ([#169](https://github.com/prometheus/statsd_exporter/pull/169), fixes [#168](https://github.com/prometheus/statsd_exporter/issues/168))
 
-## v0.8.0 / 2018-10-12
+## 0.8.0 / 2018-10-12
 
 * [ENHANCEMENT] Speed up glob matching ([#157](https://github.com/prometheus/statsd_exporter/pull/157))
 
@@ -22,7 +350,7 @@ is logged.
 
 This major enhancement was contributed by [Wangchong Zhou](https://github.com/fffonion).
 
-## v0.7.0 / 2018-08-22
+## 0.7.0 / 2018-08-22
 
 This is a breaking release, but the migration is easy: command line flags now
 require two dashes (`--help` instead of `-help`). The previous flag library
@@ -37,12 +365,12 @@ The deprecated `--statsd.listen-address` flag has been removed, use
 * [ENHANCEMENT] Summary quantiles can be configured ([#135](https://github.com/prometheus/statsd_exporter/pulls/135))
 * [BUGFIX] Fix panic if an invalid regular expression is supplied ([#126](https://github.com/prometheus/statsd_exporter/pulls/126))
 
-## v0.6.0 / 2018-01-17
+## 0.6.0 / 2018-01-17
 
 * [ENHANCEMENT] Add a drop action ([#115](https://github.com/prometheus/statsd_exporter/pulls/115))
 * [ENHANCEMENT] Allow templating metric names ([#117](https://github.com/prometheus/statsd_exporter/pulls/117))
 
-## v0.5.0 / 2017-11-16
+## 0.5.0 / 2017-11-16
 
 NOTE: This release breaks backward compatibility. `statsd_exporter` now uses
 a YAML configuration file. You must convert your mappings configuration to
@@ -105,7 +433,7 @@ There is a [tool](https://github.com/bakins/statsd-exporter-convert) available t
 * [BUGFIX] Conflicting label sets no longer crash the exporter and will be
   ignored. Restart to clear the remembered label set. [#72](https://github.com/prometheus/statsd_exporter/pulls/72)
 
-## v0.4.0 / 2017-05-12
+## 0.4.0 / 2017-05-12
 
 * [ENHANCEMENT] Improve mapping configuration parser [#61](https://github.com/prometheus/statsd_exporter/pulls/61)
 * [ENHANCEMENT] Add increment/decrement support to Gauges [#65](https://github.com/prometheus/statsd_exporter/pulls/65)
@@ -131,7 +459,6 @@ NOTE: This release renames `statsd_bridge` to `statsd_exporter`
 * [ENHANCEMENT] add root endpoint with redirect ([#25](https://github.com/prometheus/statsd_exporter/pulls/25))
 * [CHANGE] rename bridge to exporter ([#26](https://github.com/prometheus/statsd_exporter/pulls/26))
 
-
 ## 0.1.0 / 2015-04-17
 
 * Initial release

CODE_OF_CONDUCT.md

@@ -0,0 +1,3 @@
+# Prometheus Community Code of Conduct
+
+Prometheus follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/main/code-of-conduct.md).

CONTRIBUTING.md

@@ -16,3 +16,5 @@ Prometheus uses GitHub to manage reviews of pull requests.
   and the _Formatting and style_ section of Peter Bourgon's [Go: Best
   Practices for Production
   Environments](http://peter.bourgon.org/go-in-production/#formatting-and-style).
+
+* [![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/prometheus/statsd_exporter)

Dockerfile

@@ -1,7 +1,13 @@
-FROM  quay.io/prometheus/busybox:latest
+ARG ARCH="amd64"
+ARG OS="linux"
+FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
 LABEL maintainer="The Prometheus Authors <prometheus-developers@googlegroups.com>"
 
-COPY statsd_exporter /bin/statsd_exporter
+ARG ARCH="amd64"
+ARG OS="linux"
+COPY .build/${OS}-${ARCH}/statsd_exporter /bin/statsd_exporter
 
+USER        65534
 EXPOSE      9102 9125 9125/udp
+HEALTHCHECK CMD wget --spider -S "http://localhost:9102/metrics" -T 60 2>&1 || exit 1
 ENTRYPOINT  [ "/bin/statsd_exporter" ]

MAINTAINERS.md

@@ -1 +1 @@
-* Matthias Rampke <mr@soundcloud.com>
+* Matthias Rampke <matthias@prometheus.io>

Makefile

@@ -11,6 +11,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Needs to be defined before including Makefile.common to auto-generate targets
+DOCKER_ARCHS ?= amd64 armv7 arm64
+
 include Makefile.common
 
 STATICCHECK_IGNORE =

Makefile.common

@@ -36,32 +36,7 @@ GO_VERSION        ?= $(shell $(GO) version)
 GO_VERSION_NUMBER ?= $(word 3, $(GO_VERSION))
 PRE_GO_111        ?= $(shell echo $(GO_VERSION_NUMBER) | grep -E 'go1\.(10|[0-9])\.')
 
-unexport GOVENDOR
-ifeq (, $(PRE_GO_111))
-	ifneq (,$(wildcard go.mod))
-		# Enforce Go modules support just in case the directory is inside GOPATH (and for Travis CI).
-		GO111MODULE := on
-
-		ifneq (,$(wildcard vendor))
-			# Always use the local vendor/ directory to satisfy the dependencies.
-			GOOPTS := $(GOOPTS) -mod=vendor
-		endif
-	endif
-else
-	ifneq (,$(wildcard go.mod))
-		ifneq (,$(wildcard vendor))
-$(warning This repository requires Go >= 1.11 because of Go modules)
-$(warning Some recipes may not work as expected as the current Go runtime is '$(GO_VERSION_NUMBER)')
-		endif
-	else
-		# This repository isn't using Go modules (yet).
-		GOVENDOR := $(FIRST_GOPATH)/bin/govendor
-	endif
-
-	unexport GO111MODULE
-endif
 PROMU        := $(FIRST_GOPATH)/bin/promu
-STATICCHECK  := $(FIRST_GOPATH)/bin/staticcheck
 pkgs          = ./...
 
 ifeq (arm, $(GOHOSTARCH))
@@ -71,16 +46,53 @@ else
 	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)
 endif
 
-PROMU_VERSION ?= 0.2.0
+GOTEST := $(GO) test
+GOTEST_DIR :=
+ifneq ($(CIRCLE_JOB),)
+ifneq ($(shell command -v gotestsum 2> /dev/null),)
+	GOTEST_DIR := test-results
+	GOTEST := gotestsum --junitfile $(GOTEST_DIR)/unit-tests.xml --
+endif
+endif
+
+PROMU_VERSION ?= 0.15.0
 PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz
-STATICCHECK_VERSION ?= 2019.1
-STATICCHECK_URL     := https://github.com/dominikh/go-tools/releases/download/$(STATICCHECK_VERSION)/staticcheck_$(GOHOSTOS)_$(GOHOSTARCH)
+
+SKIP_GOLANGCI_LINT :=
+GOLANGCI_LINT :=
+GOLANGCI_LINT_OPTS ?=
+GOLANGCI_LINT_VERSION ?= v1.56.2
+# golangci-lint only supports linux, darwin and windows platforms on i386/amd64/arm64.
+# windows isn't included here because of the path separator being different.
+ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux darwin))
+	ifeq ($(GOHOSTARCH),$(filter $(GOHOSTARCH),amd64 i386 arm64))
+		# If we're in CI and there is an Actions file, that means the linter
+		# is being run in Actions, so we don't need to run it here.
+		ifneq (,$(SKIP_GOLANGCI_LINT))
+			GOLANGCI_LINT :=
+		else ifeq (,$(CIRCLE_JOB))
+			GOLANGCI_LINT := $(FIRST_GOPATH)/bin/golangci-lint
+		else ifeq (,$(wildcard .github/workflows/golangci-lint.yml))
+			GOLANGCI_LINT := $(FIRST_GOPATH)/bin/golangci-lint
+		endif
+	endif
+endif
 
 PREFIX                  ?= $(shell pwd)
 BIN_DIR                 ?= $(shell pwd)
 DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
+DOCKERFILE_PATH         ?= ./Dockerfile
+DOCKERBUILD_CONTEXT     ?= ./
 DOCKER_REPO             ?= prom
 
+DOCKER_ARCHS            ?= amd64
+
+BUILD_DOCKER_ARCHS = $(addprefix common-docker-,$(DOCKER_ARCHS))
+PUBLISH_DOCKER_ARCHS = $(addprefix common-docker-publish-,$(DOCKER_ARCHS))
+TAG_DOCKER_ARCHS = $(addprefix common-docker-tag-latest-,$(DOCKER_ARCHS))
+
+SANITIZED_DOCKER_IMAGE_TAG := $(subst +,-,$(DOCKER_IMAGE_TAG))
+
 ifeq ($(GOHOSTARCH),amd64)
         ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux freebsd darwin windows))
                 # Only supported on amd64
@@ -88,14 +100,14 @@ ifeq ($(GOHOSTARCH),amd64)
         endif
 endif
 
-.PHONY: all
-all: precheck style staticcheck unused build test
-
 # This rule is used to forward a target like "build" to "common-build".  This
 # allows a new "build" target to be defined in a Makefile which includes this
 # one and override "common-build" without override warnings.
 %: common-% ;
 
+.PHONY: common-all
+common-all: precheck style check_license lint yamllint unused build test
+
 .PHONY: common-style
 common-style:
 	@echo ">> checking code style"
@@ -117,79 +129,114 @@ common-check_license:
                exit 1; \
        fi
 
+.PHONY: common-deps
+common-deps:
+	@echo ">> getting dependencies"
+	$(GO) mod download
+
+.PHONY: update-go-deps
+update-go-deps:
+	@echo ">> updating Go dependencies"
+	@for m in $$($(GO) list -mod=readonly -m -f '{{ if and (not .Indirect) (not .Main)}}{{.Path}}{{end}}' all); do \
+		$(GO) get -d $$m; \
+	done
+	$(GO) mod tidy
+
 .PHONY: common-test-short
-common-test-short:
+common-test-short: $(GOTEST_DIR)
 	@echo ">> running short tests"
-	GO111MODULE=$(GO111MODULE) $(GO) test -short $(GOOPTS) $(pkgs)
+	$(GOTEST) -short $(GOOPTS) $(pkgs)
 
 .PHONY: common-test
-common-test:
+common-test: $(GOTEST_DIR)
 	@echo ">> running all tests"
-	GO111MODULE=$(GO111MODULE) $(GO) test $(test-flags) $(GOOPTS) $(pkgs)
+	$(GOTEST) $(test-flags) $(GOOPTS) $(pkgs)
+
+$(GOTEST_DIR):
+	@mkdir -p $@
 
 .PHONY: common-format
 common-format:
 	@echo ">> formatting code"
-	GO111MODULE=$(GO111MODULE) $(GO) fmt $(pkgs)
+	$(GO) fmt $(pkgs)
 
 .PHONY: common-vet
 common-vet:
 	@echo ">> vetting code"
-	GO111MODULE=$(GO111MODULE) $(GO) vet $(GOOPTS) $(pkgs)
+	$(GO) vet $(GOOPTS) $(pkgs)
 
-.PHONY: common-staticcheck
-common-staticcheck: $(STATICCHECK)
-	@echo ">> running staticcheck"
-	chmod +x $(STATICCHECK)
-ifdef GO111MODULE
-# 'go list' needs to be executed before staticcheck to prepopulate the modules cache.
-# Otherwise staticcheck might fail randomly for some reason not yet explained.
-	GO111MODULE=$(GO111MODULE) $(GO) list -e -compiled -test=true -export=false -deps=true -find=false -tags= -- ./... > /dev/null
-	GO111MODULE=$(GO111MODULE) $(STATICCHECK) -ignore "$(STATICCHECK_IGNORE)" $(pkgs)
-else
-	$(STATICCHECK) -ignore "$(STATICCHECK_IGNORE)" $(pkgs)
+.PHONY: common-lint
+common-lint: $(GOLANGCI_LINT)
+ifdef GOLANGCI_LINT
+	@echo ">> running golangci-lint"
+	$(GOLANGCI_LINT) run $(GOLANGCI_LINT_OPTS) $(pkgs)
 endif
 
+.PHONY: common-lint-fix
+common-lint-fix: $(GOLANGCI_LINT)
+ifdef GOLANGCI_LINT
+	@echo ">> running golangci-lint fix"
+	$(GOLANGCI_LINT) run --fix $(GOLANGCI_LINT_OPTS) $(pkgs)
+endif
+
+.PHONY: common-yamllint
+common-yamllint:
+	@echo ">> running yamllint on all YAML files in the repository"
+ifeq (, $(shell command -v yamllint 2> /dev/null))
+	@echo "yamllint not installed so skipping"
+else
+	yamllint .
+endif
+
+# For backward-compatibility.
+.PHONY: common-staticcheck
+common-staticcheck: lint
+
 .PHONY: common-unused
-common-unused: $(GOVENDOR)
-ifdef GOVENDOR
-	@echo ">> running check for unused packages"
-	@$(GOVENDOR) list +unused | grep . && exit 1 || echo 'No unused packages'
-else
-ifdef GO111MODULE
+common-unused:
 	@echo ">> running check for unused/missing packages in go.mod"
-	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
-ifeq (,$(wildcard vendor))
+	$(GO) mod tidy
 	@git diff --exit-code -- go.sum go.mod
-else
-	@echo ">> running check for unused packages in vendor/"
-	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
-	@git diff --exit-code -- go.sum go.mod vendor/
-endif
-endif
-endif
 
 .PHONY: common-build
 common-build: promu
 	@echo ">> building binaries"
-	GO111MODULE=$(GO111MODULE) $(PROMU) build --prefix $(PREFIX)
+	$(PROMU) build --prefix $(PREFIX) $(PROMU_BINARIES)
 
 .PHONY: common-tarball
 common-tarball: promu
 	@echo ">> building release tarball"
 	$(PROMU) tarball --prefix $(PREFIX) $(BIN_DIR)
 
-.PHONY: common-docker
-common-docker:
-	docker build -t "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" .
+.PHONY: common-docker-repo-name
+common-docker-repo-name:
+	@echo "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)"
 
-.PHONY: common-docker-publish
-common-docker-publish:
-	docker push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)"
+.PHONY: common-docker $(BUILD_DOCKER_ARCHS)
+common-docker: $(BUILD_DOCKER_ARCHS)
+$(BUILD_DOCKER_ARCHS): common-docker-%:
+	docker build -t "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(SANITIZED_DOCKER_IMAGE_TAG)" \
+		-f $(DOCKERFILE_PATH) \
+		--build-arg ARCH="$*" \
+		--build-arg OS="linux" \
+		$(DOCKERBUILD_CONTEXT)
 
-.PHONY: common-docker-tag-latest
-common-docker-tag-latest:
-	docker tag "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(DOCKER_IMAGE_TAG)" "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):latest"
+.PHONY: common-docker-publish $(PUBLISH_DOCKER_ARCHS)
+common-docker-publish: $(PUBLISH_DOCKER_ARCHS)
+$(PUBLISH_DOCKER_ARCHS): common-docker-publish-%:
+	docker push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(SANITIZED_DOCKER_IMAGE_TAG)"
+
+DOCKER_MAJOR_VERSION_TAG = $(firstword $(subst ., ,$(shell cat VERSION)))
+.PHONY: common-docker-tag-latest $(TAG_DOCKER_ARCHS)
+common-docker-tag-latest: $(TAG_DOCKER_ARCHS)
+$(TAG_DOCKER_ARCHS): common-docker-tag-latest-%:
+	docker tag "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(SANITIZED_DOCKER_IMAGE_TAG)" "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:latest"
+	docker tag "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:$(SANITIZED_DOCKER_IMAGE_TAG)" "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$*:v$(DOCKER_MAJOR_VERSION_TAG)"
+
+.PHONY: common-docker-manifest
+common-docker-manifest:
+	DOCKER_CLI_EXPERIMENTAL=enabled docker manifest create -a "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(SANITIZED_DOCKER_IMAGE_TAG)" $(foreach ARCH,$(DOCKER_ARCHS),$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME)-linux-$(ARCH):$(SANITIZED_DOCKER_IMAGE_TAG))
+	DOCKER_CLI_EXPERIMENTAL=enabled docker manifest push "$(DOCKER_REPO)/$(DOCKER_IMAGE_NAME):$(SANITIZED_DOCKER_IMAGE_TAG)"
 
 .PHONY: promu
 promu: $(PROMU)
@@ -206,14 +253,12 @@ proto:
 	@echo ">> generating code from proto files"
 	@./scripts/genproto.sh
 
-$(STATICCHECK):
+ifdef GOLANGCI_LINT
+$(GOLANGCI_LINT):
 	mkdir -p $(FIRST_GOPATH)/bin
-	curl -s -L $(STATICCHECK_URL) > $(STATICCHECK)
-
-ifdef GOVENDOR
-.PHONY: $(GOVENDOR)
-$(GOVENDOR):
-	GOOS= GOARCH= $(GO) get -u github.com/kardianos/govendor
+	curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/$(GOLANGCI_LINT_VERSION)/install.sh \
+		| sed -e '/install -d/d' \
+		| sh -s -- -b $(FIRST_GOPATH)/bin $(GOLANGCI_LINT_VERSION)
 endif
 
 .PHONY: precheck
@@ -222,7 +267,6 @@ precheck::
 define PRECHECK_COMMAND_template =
 precheck:: $(1)_precheck
 
-
 PRECHECK_COMMAND_$(1) ?= $(1) $$(strip $$(PRECHECK_OPTIONS_$(1)))
 .PHONY: $(1)_precheck
 $(1)_precheck:

README.md

@@ -8,81 +8,116 @@
 
 ## Overview
 
-### With StatsD
+The StatsD exporter is a drop-in replacement for StatsD.
+This exporter translates StatsD metrics to Prometheus metrics via configured mapping rules.
 
-To pipe metrics from an existing StatsD environment into Prometheus, configure
-StatsD's repeater backend to repeat all received metrics to a `statsd_exporter`
-process. This exporter translates StatsD metrics to Prometheus metrics via
-configured mapping rules.
+We recommend using the exporter only as an intermediate solution, and switching to [native Prometheus instrumentation](http://prometheus.io/docs/instrumenting/clientlibs/) in the long term.
+While it is common to run centralized StatsD servers, the exporter works best as a [sidecar](https://docs.microsoft.com/en-us/azure/architecture/patterns/sidecar).
+
+### Transitioning from an existing StatsD setup
+
+The relay feature allows for a gradual transition.
+
+Introduce the exporter by adding it as a sidecar alongside the application instances.
+In Kubernetes, this means adding it to the [pod](https://kubernetes.io/docs/concepts/workloads/pods/).
+Use the `--statsd.relay.address` to forward metrics to your existing StatsD UDP endpoint.
+Relaying forwards statsd events unmodified, preserving the original metric name and tags in any format.
+
+    +-------------+    +----------+                  +------------+
+    | Application +--->| Exporter +----------------->|  StatsD    |
+    +-------------+    +----------+                  +------------+
+                              ^
+                              |                      +------------+
+                              +----------------------+ Prometheus |
+                                                     +------------+
+
+### Relaying from StatsD
+
+To pipe metrics from an existing StatsD environment into Prometheus, configure StatsD's repeater backend to repeat all received metrics to a `statsd_exporter` process.
 
     +----------+                         +-------------------+                        +--------------+
     |  StatsD  |---(UDP/TCP repeater)--->|  statsd_exporter  |<---(scrape /metrics)---|  Prometheus  |
     +----------+                         +-------------------+                        +--------------+
 
-### Without StatsD
+This allows trying out the exporter with minimal effort, but does not provide the per-instance metrics of the sidecar pattern.
 
-Since the StatsD exporter uses the same line protocol as StatsD itself, you can
-also configure your applications to send StatsD metrics directly to the exporter.
-In that case, you don't need to run a StatsD server anymore.
+### Tagging Extensions
 
-We recommend this only as an intermediate solution and recommend switching to
-[native Prometheus instrumentation](http://prometheus.io/docs/instrumenting/clientlibs/)
-in the long term.
+The exporter supports Librato, InfluxDB, DogStatsD, and SignalFX-style tags,
+which will be converted into Prometheus labels.
 
-### DogStatsD extensions
+For Librato-style tags, they must be appended to the metric name with a
+delimiting `#`, as so:
 
-The exporter will convert DogStatsD-style tags to prometheus labels. See
-[Tags](http://docs.datadoghq.com/guides/dogstatsd/#tags) in the DogStatsD
-documentation for the concept description and
-[Datagram Format](http://docs.datadoghq.com/guides/dogstatsd/#datagram-format)
-for specifics. It boils down to appending
-`|#tag:value,another_tag:another_value` to the normal StatsD format.  Tags
-without values (`#some_tag`) are not supported.
+```
+metric.name#tagName=val,tag2Name=val2:0|c
+```
+
+See the [statsd-librato-backend README](https://github.com/librato/statsd-librato-backend#tags)
+for a more complete description.
+
+For InfluxDB-style tags, they must be appended to the metric name with a
+delimiting comma, as so:
+
+```
+metric.name,tagName=val,tag2Name=val2:0|c
+```
+
+See [this InfluxDB blog post](https://www.influxdata.com/blog/getting-started-with-sending-statsd-metrics-to-telegraf-influxdb/#introducing-influx-statsd)
+for a larger overview.
+
+
+For DogStatsD-style tags, they're appended as a `|#` delimited section at the
+end of the metric, as so:
+
+```
+metric.name:0|c|#tagName:val,tag2Name:val2
+```
+
+See [Tags](https://docs.datadoghq.com/developers/dogstatsd/data_types/#tagging)
+in the DogStatsD documentation for the concept description and
+[Datagram Format](https://docs.datadoghq.com/developers/dogstatsd/datagram_shell/).
+If you encounter problems, note that this tagging style is incompatible with
+the original `statsd` implementation.
+
+For [SignalFX dimension](https://github.com/signalfx/signalfx-agent/blob/main/docs/monitors/collectd-statsd.md#adding-dimensions-to-statsd-metrics), add the tags to the metric name in square brackets, as so:
+
+```
+metric.name[tagName=val,tag2Name=val2]:0|c
+```
+
+Be aware: If you mix tag styles (e.g., Librato/InfluxDB with DogStatsD), the exporter will consider this an error and the behavior is undefined.
+Also, tags without values (`#some_tag`) are not supported and will be ignored.
+
+The exporter parses all tagging formats by default, but individual tagging formats can be disabled with command line flags:
+```
+--no-statsd.parse-dogstatsd-tags
+--no-statsd.parse-influxdb-tags
+--no-statsd.parse-librato-tags
+--no-statsd.parse-signalfx-tags
+```
+
+By default, labels explicitly specified in configuration take precedence over labels from tags.
+To set the label from the statsd event tag, use [`honor_labels`](#honor-labels).
 
 ## Building and Running
 
 NOTE: Version 0.7.0 switched to the [kingpin](https://github.com/alecthomas/kingpin) flags library. With this change, flag behaviour is POSIX-ish:
 
 * long flags start with two dashes (`--version`)
+* boolean long flags are disabled by prefixing with no (`--flag-name` is true, `--no-flag-name` is false)
 * multiple short flags can be combined (but there currently is only one)
 * flag processing stops at the first `--`
+* see `--help` for a full list of flags
 
-    ```
-    $ go build
-    $ ./statsd_exporter --help
-    usage: statsd_exporter [<flags>]
+## Lifecycle API
 
-    Flags:
-      -h, --help              Show context-sensitive help (also try --help-long and
-                              --help-man).
-          --web.listen-address=":9102"  
-                              The address on which to expose the web interface and
-                              generated Prometheus metrics.
-          --web.telemetry-path="/metrics"  
-                              Path under which to expose metrics.
-          --statsd.listen-udp=":9125"  
-                              The UDP address on which to receive statsd metric
-                              lines. "" disables it.
-          --statsd.listen-tcp=":9125"  
-                              The TCP address on which to receive statsd metric
-                              lines. "" disables it.
-          --statsd.mapping-config=STATSD.MAPPING-CONFIG  
-                              Metric mapping configuration file name.
-          --statsd.read-buffer=STATSD.READ-BUFFER  
-                              Size (in bytes) of the operating system's transmit
-                              read buffer associated with the UDP connection. Please
-                              make sure the kernel parameters net.core.rmem_max is
-                              set to a value greater than the value specified.
-          --debug.dump-fsm="" The path to dump internal FSM generated for glob
-                              matching as Dot file.
-          --log.level="info"  Only log messages with the given severity or above.
-                              Valid levels: [debug, info, warn, error, fatal]
-          --log.format="logger:stderr"  
-                              Set the log target and format. Example:
-                              "logger:syslog?appname=bob&local=7" or
-                              "logger:stdout?json=true"
-          --version           Show application version.
-    ```
+The `statsd_exporter` has an optional lifecycle API (disabled by default) that can be used to reload or quit the exporter 
+by sending a `PUT` or `POST` request to the `/-/reload` or `/-/quit` endpoints.
+
+## Relay
+
+The `statsd_exporter` has an optional mode that will buffer and relay incoming statsd lines to a remote server. This is useful to "tee" the data when migrating to using the exporter. The relay will flush the buffer at least once per second to avoid delaying delivery of metrics.
 
 ## Tests
 
@@ -92,7 +127,7 @@ NOTE: Version 0.7.0 switched to the [kingpin](https://github.com/alecthomas/king
 
 The `statsd_exporter` can be configured to translate specific dot-separated StatsD
 metrics into labeled Prometheus metrics via a simple mapping language. The config
-file is watched for changes and automatically reloaded.
+file is reloaded on SIGHUP.
 
 A mapping definition starts with a line matching the StatsD metric in question,
 with `*`s acting as wildcards for each dot-separated metric component. The
@@ -113,22 +148,25 @@ In general, the different metric types are translated as follows:
 
     StatsD counter -> Prometheus counter
 
-    StatsD timer   -> Prometheus summary                    <-- indicates timer quantiles
-                   -> Prometheus counter (suffix `_total`)  <-- indicates total time spent
-                   -> Prometheus counter (suffix `_count`)  <-- indicates total number of timer events
+    StatsD timer, histogram, distribution   -> Prometheus summary or histogram
+
+### Glob matching
+
+The default (and fastest) `glob` mapping style uses `*` to denote parts of the statsd metric name that may vary.
+These varying parts can then be referenced in the construction of the Prometheus metric name and labels.
 
 An example mapping configuration:
 
 ```yaml
 mappings:
-- match: test.dispatcher.*.*.*
+- match: "test.dispatcher.*.*.*"
   name: "dispatcher_events_total"
   labels:
     processor: "$1"
     action: "$2"
     outcome: "$3"
     job: "test_dispatcher"
-- match: *.signup.*.*
+- match: "*.signup.*.*"
   name: "signup_events_total"
   labels:
     provider: "$2"
@@ -154,94 +192,50 @@ wildcard match in the matching line. That allows for dynamic rewrites, such as:
 
 ```yaml
 mappings:
-- match: test.*.*.counter
+- match: "test.*.*.counter"
   name: "${2}_total"
   labels:
     provider: "$1"
 ```
 
+Glob matching offers the best performance for common mappings.
+
+#### Ordering glob rules
+
+List more specific matches before wildcards, from left to right:
+
+    a.b.c
+    a.b.*
+    a.*.d
+    a.*.*
+
+This avoids unexpected shadowing of later rules, and performance impact from backtracking.
+
+Alternatively, you can disable mapping ordering altogether.
+With unordered mapping, at each hierarchy level the most specific match wins.
+This has the same effect as using the recommended ordering.
+
+### Regular expression matching
+
+The `regex` mapping style uses regular expressions to match the full statsd metric name.
+Use it if the glob mapping is not flexible enough to pull structured data from the available statsd metric names.
+
+Regular expression matching is significantly slower than glob mapping as all mappings must be tested in order.
+Because of this, **regex mappings are only executed after all glob mappings**.
+In other words, glob mappings take preference over regex matches, irrespective of the order in which they are specified.
+Regular expression matches are always evaluated in order, and the first match wins.
+
 The metric name can also contain references to regex matches. The mapping above
 could be written as:
 
-```
+```yaml
 mappings:
-- match: test\.(\w+)\.(\w+)\.counter
+- match: "test\\.(\\w+)\\.(\\w+)\\.counter"
   match_type: regex
   name: "${2}_total"
   labels:
     provider: "$1"
-```
-
-Please note that metrics with the same name must also have the same set of
-label names.
-
-If the default metric help text is insufficient for your needs you may use the YAML
-configuration to specify a custom help text for each mapping:
-
-```yaml
-mappings:
-- match: http.request.*
-  help: "Total number of http requests"
-  name: "http_requests_total"
-  labels:
-    code: "$1"
-```
-
-### StatsD timers
-
-By default, statsd timers are represented as a Prometheus summary with
-quantiles. You may optionally configure the [quantiles and acceptable
-error](https://prometheus.io/docs/practices/histograms/#quantiles):
-
-```yaml
-mappings:
-- match: test.timing.*.*.*
-  timer_type: summary
-  name: "my_timer"
-  labels:
-    provider: "$2"
-    outcome: "$3"
-    job: "${1}_server"
-  quantiles:
-    - quantile: 0.99
-      error: 0.001
-    - quantile: 0.95
-      error: 0.01
-    - quantile: 0.9
-      error: 0.05
-    - quantile: 0.5
-      error: 0.005
-```
-
-The default quantiles are 0.99, 0.9, and 0.5.
-
-In the configuration, one may also set the timer type to "histogram". The
-default is "summary" as in the plain text configuration format.  For example,
-to set the timer type for a single metric:
-
-```yaml
-mappings:
-- match: test.timing.*.*.*
-  timer_type: histogram
-  buckets: [ 0.01, 0.025, 0.05, 0.1 ]
-  name: "my_timer"
-  labels:
-    provider: "$2"
-    outcome: "$3"
-    job: "${1}_server"
-```
-
-### Regular expression matching
-
-Another capability when using YAML configuration is the ability to define matches
-using raw regular expressions as opposed to the default globbing style of match.
-This may allow for pulling structured data from otherwise poorly named statsd
-metrics AND allow for more precise targetting of match rules. When no `match_type`
-paramter is specified the default value of `glob` will be assumed:
-
-```yaml
-mappings:
-- match: (.*)\.(.*)--(.*)\.status\.(.*)\.count
+- match: "(.*)\\.(.*)--(.*)\\.status\.(.*)\\.count"
   match_type: regex
   name: "request_total"
   labels:
@@ -251,69 +245,219 @@ mappings:
     code: "$4"
 ```
 
-Note, that one may also set the histogram buckets.  If not set, then the default
-[Prometheus client values](https://godoc.org/github.com/prometheus/client_golang/prometheus#pkg-variables) are used: `[.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10]`. `+Inf` is added
-automatically.
+Be aware about yaml escape rules as a mapping like the following one will not work.
+```yaml
+mappings:
+- match: "test\\.(\w+)\\.(\w+)\\.counter"
+  match_type: regex
+  name: "${2}_total"
+  labels:
+    provider: "$1"
+```
 
-`timer_type` is only used when the statsd metric type is a timer. `buckets` is
-only used when the statsd metric type is a timerand the `timer_type` is set to
-"histogram."
+#### Special match groups
 
-### Global defaults
-
-One may also set defaults for the timer type, buckets or quantiles, and match_type. These will be used
-by all mappings that do not define these.
-
-An option that can only be configured in `defaults` is `glob_disable_ordering`, which is `false` if omitted. By setting this to `true`, `glob` match type will not honor the occurance of rules in the mapping rules file and always treat `*` as lower priority than a general string.
+When using regex, the match group `0` is the full match and can be used to attach labels to the metric.
+Example:
 
 ```yaml
-defaults:
-  timer_type: histogram
-  buckets: [.005, .01, .025, .05, .1, .25, .5, 1, 2.5 ]
-  match_type: glob
-  glob_disable_ordering: false
-  ttl: 0 # metrics do not expire
 mappings:
-# This will be a histogram using the buckets set in `defaults`.
-- match: test.timing.*.*.*
+- match: ".+"
+  match_type: regex
+  name: "$0"
+  labels:
+    statsd_metric_name: "$0"
+```
+
+If a metric `my.statsd_counter` is received, the metric name will **still** be mapped to `my_statsd_counter` (Prometheus compatible name).
+But the metric will also have the label `statsd_metric_name` with the value `my.statsd_counter` (unchanged value).
+
+Note: If you use the `match` like the example (i.e. `.+`), be aware that it will be a "catch-all" block. So it should come at the very end of the mapping list.
+
+The same is not achievable with glob matching, for more details check [this issue](https://github.com/prometheus/statsd_exporter/issues/444).
+
+### Naming, labels, and help
+
+Please note that metrics with the same name must also have the same set of
+label names.
+
+If the default metric help text is insufficient for your needs you may use the YAML
+configuration to specify a custom help text for each mapping:
+
+```yaml
+mappings:
+- match: "http.request.*"
+  help: "Total number of http requests"
+  name: "http_requests_total"
+  labels:
+    code: "$1"
+```
+
+### Honor labels
+
+By default, labels specified in the mapping configuration take precedence over tags in the statsd event.
+
+To set the label value to the original tag value, if present, specify `honor_labels: true` in the mapping configuration.
+In this case, the label specified in the mapping acts as a default.
+
+### StatsD timers and distributions
+
+By default, statsd timers and distributions (collectively "observers") are
+represented as a Prometheus summary with quantiles. You may optionally
+configure the [quantiles and acceptable
+error](https://prometheus.io/docs/practices/histograms/#quantiles), as well
+as adjusting how the summary metric is aggregated:
+
+```yaml
+mappings:
+- match: "test.timing.*.*.*"
+  observer_type: summary
   name: "my_timer"
   labels:
     provider: "$2"
     outcome: "$3"
     job: "${1}_server"
-# This will be a summary timer.
-- match: other.timing.*.*.*
-  timer_type: summary
-  name: "other_timer"
+  summary_options:
+    quantiles:
+      - quantile: 0.99
+        error: 0.001
+      - quantile: 0.95
+        error: 0.01
+      - quantile: 0.9
+        error: 0.05
+      - quantile: 0.5
+        error: 0.005
+    max_age: 30s
+    age_buckets: 3
+    buf_cap: 1000
+```
+
+The default quantiles are 0.99, 0.9, and 0.5.
+
+The default summary age is 10 minutes, the default number of buckets
+is 5 and the default buffer size is 500.
+See also the [`golang_client` docs](https://godoc.org/github.com/prometheus/client_golang/prometheus#SummaryOpts).
+The `max_summary_age` corresponds to `SummaryOptions.MaxAge`, `summary_age_buckets` to `SummaryOptions.AgeBuckets` and `stream_buffer_size` to `SummaryOptions.BufCap`.
+
+In the configuration, one may also set the observer type to "histogram". For example,
+to set the observer type for a single timer metric:
+
+```yaml
+mappings:
+- match: "test.timing.*.*.*"
+  observer_type: histogram
+  histogram_options:
+    buckets: [ 0.01, 0.025, 0.05, 0.1 ]
+    native_histogram_bucket_factor: 1.1
+    native_histogram_max_buckets: 256
+  name: "my_timer"
+  labels:
+    provider: "$2"
+    outcome: "$3"
+    job: "${1}_server"
+```
+
+If not set, then the default
+[Prometheus client 
+values](https://godoc.org/github.com/prometheus/client_golang/prometheus#pkg-variables) 
+are used for the histogram buckets:
+`[.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10]`.
+`+Inf` is added automatically.
+If your Prometheus server is enabled to scrape native histograms (v2.40.0+), 
+then you can set the `native_histogram_bucket_factor` to configure precision of the
+buckets in the sparse histogram. More about this in the original [client_golang docs](https://github.com/prometheus/client_golang/blob/449b46435075e6e069e05af920fe028b941033cf/prometheus/histogram.go#L399-L430).
+Also, a configuration of the maximum number of buckets can be set with `native_histogram_max_buckets`, this
+avoids the histograms to grow too large in memory. More about this in the original [client_golang docs](https://github.com/prometheus/client_golang/blob/449b46435075e6e069e05af920fe028b941033cf/prometheus/histogram.go#L443-L467).
+
+`observer_type` is only used when the statsd metric type is a timer, histogram, or distribution.
+`buckets` is only used when the statsd metric type is one of these, and the `observer_type` is set to `histogram`.
+
+Timers will be accepted with the `ms` statsd type.
+Statsd timer data is transmitted in milliseconds, while Prometheus expects the unit to be seconds.
+The exporter converts all timer observations to seconds.
+
+Histogram and distribution events (`h` and `d` metric type) are not subject to unit conversion.
+
+### DogStatsD Client Behavior
+
+#### `timed()` decorator
+
+The DogStatsD client's [timed](https://datadogpy.readthedocs.io/en/latest/#datadog.threadstats.base.ThreadStats.timed) decorator emits the metric in seconds but uses the `ms` type.
+Set [`use_ms=True`](https://datadogpy.readthedocs.io/en/latest/index.html?highlight=use_ms) to send the correct units.
+
+### Regular expression matching
+
+Another capability when using YAML configuration is the ability to define matches
+using raw regular expressions as opposed to the default globbing style of match.
+This may allow for pulling structured data from otherwise poorly named statsd
+metrics AND allow for more precise targetting of match rules. When no `match_type`
+parameter is specified the default value of `glob` will be assumed:
+
+```yaml
+mappings:
+- match: "(.*)\\.(.*)--(.*)\\.status\\.(.*)\\.count"
+  match_type: regex
+  name: "request_total"
+  labels:
+    hostname: "$1"
+    exec: "$2"
+    protocol: "$3"
+    code: "$4"
+```
+
+### Global defaults
+
+One may also set defaults for the observer type, histogram options, summary options, and match type.
+These will be used by all mappings that do not define them.
+
+An option that can only be configured in `defaults` is `glob_disable_ordering`, which is `false` if omitted.
+By setting this to `true`, `glob` match type will not honor the occurance of rules in the mapping rules file and always treat `*` as lower priority than a concrete string.
+
+Setting `buckets` or `quantiles` in the defaults is deprecated in favor of `histogram_options` and `summary_options`, which will override the deprecated values.
+
+If `summary_options` is present in a mapping config, it will only override the fields set in the mapping. Unset fields in the mapping will take the values from the defaults. 
+
+```yaml
+defaults:
+  observer_type: histogram
+  histogram_options:
+    buckets: [.005, .01, .025, .05, .1, .25, .5, 1, 2.5 ]
+    native_histogram_bucket_factor: 1.1
+    native_histogram_max_buckets: 256
+  summary_options:
+    quantiles:
+      - quantile: 0.99
+        error: 0.001
+      - quantile: 0.95
+        error: 0.01
+      - quantile: 0.9
+        error: 0.05
+      - quantile: 0.5
+        error: 0.005
+    max_age: 5m
+    age_buckets: 2
+    buf_cap: 1000
+  match_type: glob
+  glob_disable_ordering: false
+  ttl: 0 # metrics do not expire
+mappings:
+# This will be a histogram using the buckets set in `defaults`.
+- match: "test.timing.*.*.*"
+  name: "my_timer"
+  labels:
+    provider: "$2"
+    outcome: "$3"
+    job: "${1}_server"
+# This will be a summary using the summary_options set in `defaults`
+- match: "other.distribution.*.*.*"
+  observer_type: summary
+  name: "other_distribution"
   labels:
     provider: "$2"
     outcome: "$3"
     job: "${1}_server_other"
 ```
 
-### Choosing between glob or regex match type
-
-Despite from the missing flexibility of using regular expression in mapping and
-formatting labels, `glob` matching is optimized to have better performance than
-`regex` in certain use cases. In short, glob will have best performance if the
-rules amount is not so less and captures (using of `*`) is not to much in a
-single rule. Whether disabling ordering in glob or not won't have a noticable
-effect on performance in general use cases. In edge cases like the below however,
-disabling ordering will be beneficial:
-
-    a.*.*.*.*
-    a.b.*.*.*
-    a.b.c.*.*
-    a.b.c.d.*
-
-The reason is that the list assignment of captures (using of `*`) is the most
-expensive operation in glob. Honoring ordering will result in up to 10 list
-assignments, while without ordering it will need only 4 at most.
-
-For details, see [pkg/mapper/fsm/README.md](pkg/mapper/fsm/README.md).
-Running `go test -bench .` in **pkg/mapper** directory will produce
-a detailed comparison between the two match type.
-
 ### `drop` action
 
 You may also drop metrics by specifying a "drop" action on a match. For
@@ -322,14 +466,14 @@ example:
 ```yaml
 mappings:
 # This metric would match as normal.
-- match: test.timing.*.*.*
+- match: "test.timing.*.*.*"
   name: "my_timer"
   labels:
     provider: "$2"
     outcome: "$3"
     job: "${1}_server"
 # Any metric not matched will be dropped because "." matches all metrics.
-- match: .
+- match: "."
   match_type: regex
   action: drop
   name: "dropped"
@@ -346,14 +490,26 @@ mapping definition allows you to specify which metric type to match:
 
 ```
 mappings:
-- match: test.foo.*
+- match: "test.foo.*"
   name: "test_foo"
   match_metric_type: counter
   labels:
     provider: "$1"
 ```
 
-Possible values for `match_metric_type` are `gauge`, `counter` and `timer`.
+Possible values for `match_metric_type` are `gauge`, `counter` and `observer`.
+
+### Mapping cache size and cache replacement policy
+
+There is a cache used to improve the performance of the metric mapping, that can greatly improvement performance.
+The cache has a default maximum of 1000 unique statsd metric names -> prometheus metrics mappings that it can store.
+This maximum can be adjusted using the `statsd.cache-size` flag.
+
+If the maximum is reached, entries are by default rotated using the [least recently used replacement policy](https://en.wikipedia.org/wiki/Cache_replacement_policies#Least_recently_used_(LRU)). This strategy is optimal when memory is constrained as only the most recent entries are retained.
+
+Alternatively, you can choose a [random-replacement cache strategy](https://en.wikipedia.org/wiki/Cache_replacement_policies#Random_replacement_(RR)). This is less optimal if the cache is smaller than the cacheable set, but requires less locking. Use this for very high throughput, but make sure to allow for a cache that holds all metrics.
+
+The optimal cache size is determined by the cardinality of the _incoming_ metrics.
 
 ### Time series expiration
 
@@ -367,9 +523,30 @@ metrics that do not expire.
  expire a metric only by changing the mapping configuration. At least one
  sample must be received for updated mappings to take effect.
 
+### Unit conversions
+
+The `scale` parameter can be used to define unit conversions for metric values. The value is a floating point number to scale metric values by. This can be useful for converting non-base units (e.g. milliseconds, kilobytes) to base units (e.g. seconds, bytes) as recommended in [prometheus best practices](https://prometheus.io/docs/practices/naming/).
+
+```yaml
+mappings:
+- match: foo.latency_ms
+  name: foo_latency_seconds
+  scale: 0.001
+- match: bar.processed_kb
+  name: bar_processed_bytes
+  scale: 1024
+- match: baz.latency_us
+  name: baz_latency_seconds
+  scale: 1e-6
+```
+
+### Event flushing configuration
+
+ Internally `statsd_exporter` runs a goroutine for each network listener (UDP, TCP & Unix Socket).  These each receive and parse metrics received into an event.  For performance purposes, these events are queued internally and flushed to the main exporter goroutine periodically in batches.  The size of this queue and the flush criteria can be tuned with the `--statsd.event-queue-size`, `--statsd.event-flush-threshold` and `--statsd.event-flush-interval`.  However, the defaults should perform well even for very high traffic environments.
+
 ## Using Docker
 
-You can deploy this exporter using the [prom/statsd-exporter](https://registry.hub.docker.com/u/prom/statsd-exporter/) Docker image.
+You can deploy this exporter using the [prom/statsd-exporter](https://registry.hub.docker.com/r/prom/statsd-exporter) Docker image.
 
 For example:
 
@@ -381,8 +558,17 @@ docker run -d -p 9102:9102 -p 9125:9125 -p 9125:9125/udp \
         prom/statsd-exporter --statsd.mapping-config=/tmp/statsd_mapping.yml
 ```
 
+## Library packages
+
+Parts of the implementation of this exporter are available as separate packages.
+See the [documentation](https://pkg.go.dev/github.com/prometheus/statsd_exporter/pkg) for details.
+
+For the time being, there are *no stability guarantees* for library interfaces.
+We will try to call out any significant changes in the [changelog](https://github.com/prometheus/statsd_exporter/blob/master/CHANGELOG.md).
+Semantic versioning of the exporter is based on the impact on users of the exporter, not users of the library.
+
+We encourage re-use of these packages and welcome [issues](https://github.com/prometheus/statsd_exporter/issues?q=is%3Aopen+is%3Aissue+label%3Alibrary) related to their usability as a library.
 
-[travis]: https://travis-ci.org/prometheus/statsd_exporter
 [circleci]: https://circleci.com/gh/prometheus/statsd_exporter
 [quay]: https://quay.io/repository/prometheus/statsd-exporter
 [hub]: https://hub.docker.com/r/prom/statsd-exporter/

SECURITY.md

@@ -0,0 +1,6 @@
+# Reporting a security issue
+
+The Prometheus security policy, including how to report vulnerabilities, can be
+found here:
+
+<https://prometheus.io/docs/operating/security/>

VERSION

@@ -1 +1 @@
-0.9.0
+0.26.1

bridge_test.go

@@ -14,137 +14,419 @@
 package main
 
 import (
+	"fmt"
+	"net"
 	"reflect"
 	"testing"
+	"time"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+	dto "github.com/prometheus/client_model/go"
+
+	"github.com/prometheus/statsd_exporter/pkg/clock"
+	"github.com/prometheus/statsd_exporter/pkg/event"
+	"github.com/prometheus/statsd_exporter/pkg/exporter"
+	"github.com/prometheus/statsd_exporter/pkg/line"
+	"github.com/prometheus/statsd_exporter/pkg/listener"
+	"github.com/prometheus/statsd_exporter/pkg/mapper"
 )
 
 func TestHandlePacket(t *testing.T) {
 	scenarios := []struct {
 		name string
 		in   string
-		out  Events
+		out  event.Events
 	}{
 		{
 			name: "empty",
 		}, {
 			name: "simple counter",
 			in:   "foo:2|c",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      2,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      2,
+					CLabels:     map[string]string{},
 				},
 			},
 		}, {
 			name: "simple gauge",
 			in:   "foo:3|g",
-			out: Events{
-				&GaugeEvent{
-					metricName: "foo",
-					value:      3,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.GaugeEvent{
+					GMetricName: "foo",
+					GValue:      3,
+					GLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "gauge with sampling",
+			in:   "foo:3|g|@0.2",
+			out: event.Events{
+				&event.GaugeEvent{
+					GMetricName: "foo",
+					GValue:      3,
+					GLabels:     map[string]string{},
 				},
 			},
 		}, {
 			name: "gauge decrement",
 			in:   "foo:-10|g",
-			out: Events{
-				&GaugeEvent{
-					metricName: "foo",
-					value:      -10,
-					relative:   true,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.GaugeEvent{
+					GMetricName: "foo",
+					GValue:      -10,
+					GRelative:   true,
+					GLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "gauge increment",
+			in:   "foo:+10|g",
+			out: event.Events{
+				&event.GaugeEvent{
+					GMetricName: "foo",
+					GValue:      10,
+					GRelative:   true,
+					GLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "gauge set negative",
+			in:   "foo:0|g\nfoo:-1|g",
+			out: event.Events{
+				&event.GaugeEvent{
+					GMetricName: "foo",
+					GValue:      0,
+					GRelative:   false,
+					GLabels:     map[string]string{},
+				},
+				&event.GaugeEvent{
+					GMetricName: "foo",
+					GValue:      -1,
+					GRelative:   true,
+					GLabels:     map[string]string{},
+				},
+			},
+		}, {
+			// Test the sequence given here https://github.com/statsd/statsd/blob/master/docs/metric_types.md#gauges
+			name: "gauge up and down",
+			in:   "gaugor:333|g\ngaugor:-10|g\ngaugor:+4|g",
+			out: event.Events{
+				&event.GaugeEvent{
+					GMetricName: "gaugor",
+					GValue:      333,
+					GRelative:   false,
+					GLabels:     map[string]string{},
+				},
+				&event.GaugeEvent{
+					GMetricName: "gaugor",
+					GValue:      -10,
+					GRelative:   true,
+					GLabels:     map[string]string{},
+				},
+				&event.GaugeEvent{
+					GMetricName: "gaugor",
+					GValue:      4,
+					GRelative:   true,
+					GLabels:     map[string]string{},
 				},
 			},
 		}, {
 			name: "simple timer",
 			in:   "foo:200|ms",
-			out: Events{
-				&TimerEvent{
-					metricName: "foo",
-					value:      200,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.2,
+					OLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "simple histogram",
+			in:   "foo:200|h",
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      200,
+					OLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "simple distribution",
+			in:   "foo:200|d",
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      200,
+					OLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "distribution with sampling",
+			in:   "foo:0.01|d|@0.2|#tag1:bar,#tag2:baz",
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+			},
+		}, {
+			name: "librato tag extension",
+			in:   "foo#tag1=bar,tag2=baz:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+			},
+		}, {
+			name: "librato tag extension with tag keys unsupported by prometheus",
+			in:   "foo#09digits=0,tag.with.dots=1:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"_09digits": "0", "tag_with_dots": "1"},
+				},
+			},
+		}, {
+			name: "influxdb tag extension",
+			in:   "foo,tag1=bar,tag2=baz:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+			},
+		}, {
+			name: "SignalFx tag extension",
+			in:   "foo.[tag1=bar,tag2=baz]test:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo.test",
+					CValue:      100,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+			},
+		}, {
+			name: "SignalFx tag extension, tags at end of name",
+			in:   "foo.test[tag1=bar,tag2=baz]:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo.test",
+					CValue:      100,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+			},
+		}, {
+			name: "SignalFx tag extension, tags at beginning of name",
+			in:   "[tag1=bar,tag2=baz]foo.test:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo.test",
+					CValue:      100,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+			},
+		}, {
+			name: "SignalFx tag extension, no tags",
+			in:   "foo.[]test:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo.test",
+					CValue:      100,
+					CLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "SignalFx tag extension, non-kv tags",
+			in:   "foo.[tag1,tag2]test:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo.test",
+					CValue:      100,
+					CLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "SignalFx tag extension, missing closing bracket",
+			in:   "[tag1=bar,tag2=bazfoo.test:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "[tag1=bar,tag2=bazfoo.test",
+					CValue:      100,
+					CLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "SignalFx tag extension, missing opening bracket",
+			in:   "tag1=bar,tag2=baz]foo.test:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "tag1=bar,tag2=baz]foo.test",
+					CValue:      100,
+					CLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "influxdb tag extension with tag keys unsupported by prometheus",
+			in:   "foo,09digits=0,tag.with.dots=1:100|c",
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"_09digits": "0", "tag_with_dots": "1"},
 				},
 			},
 		}, {
 			name: "datadog tag extension",
 			in:   "foo:100|c|#tag1:bar,tag2:baz",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      100,
-					labels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
 				},
 			},
 		}, {
 			name: "datadog tag extension with # in all keys (as sent by datadog php client)",
 			in:   "foo:100|c|#tag1:bar,#tag2:baz",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      100,
-					labels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
 				},
 			},
 		}, {
 			name: "datadog tag extension with tag keys unsupported by prometheus",
 			in:   "foo:100|c|#09digits:0,tag.with.dots:1",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      100,
-					labels:     map[string]string{"_09digits": "0", "tag_with_dots": "1"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"_09digits": "0", "tag_with_dots": "1"},
 				},
 			},
 		}, {
 			name: "datadog tag extension with valueless tags: ignored",
 			in:   "foo:100|c|#tag_without_a_value",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      100,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{},
 				},
 			},
 		}, {
 			name: "datadog tag extension with valueless tags (edge case)",
 			in:   "foo:100|c|#tag_without_a_value,tag:value",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      100,
-					labels:     map[string]string{"tag": "value"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"tag": "value"},
 				},
 			},
 		}, {
 			name: "datadog tag extension with empty tags (edge case)",
 			in:   "foo:100|c|#tag:value,,",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      100,
-					labels:     map[string]string{"tag": "value"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      100,
+					CLabels:     map[string]string{"tag": "value"},
 				},
 			},
 		}, {
 			name: "datadog tag extension with sampling",
 			in:   "foo:100|c|@0.1|#tag1:bar,#tag2:baz",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      1000,
-					labels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      1000,
+					CLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+			},
+		}, {
+			name: "librato/dogstatsd mixed tag styles without sampling",
+			in:   "foo#tag1=foo,tag3=bing:100|c|#tag1:bar,#tag2:baz",
+			out:  event.Events{},
+		}, {
+			name: "signalfx/dogstatsd mixed tag styles without sampling",
+			in:   "foo[tag1=foo,tag3=bing]:100|c|#tag1:bar,#tag2:baz",
+			out:  event.Events{},
+		}, {
+			name: "influxdb/dogstatsd mixed tag styles without sampling",
+			in:   "foo,tag1=foo,tag3=bing:100|c|#tag1:bar,#tag2:baz",
+			out:  event.Events{},
+		}, {
+			name: "mixed tag styles with sampling",
+			in:   "foo#tag1=foo,tag3=bing:100|c|@0.1|#tag1:bar,#tag2:baz",
+			out:  event.Events{},
+		}, {
+			name: "histogram with sampling",
+			in:   "foo:0.01|h|@0.2|#tag1:bar,#tag2:baz",
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
+				},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.01,
+					OLabels:     map[string]string{"tag1": "bar", "tag2": "baz"},
 				},
 			},
 		}, {
 			name: "datadog tag extension with multiple colons",
 			in:   "foo:100|c|@0.1|#tag1:foo:bar",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      1000,
-					labels:     map[string]string{"tag1": "foo:bar"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      1000,
+					CLabels:     map[string]string{"tag1": "foo:bar"},
 				},
 			},
 		}, {
@@ -156,62 +438,62 @@ func TestHandlePacket(t *testing.T) {
 		}, {
 			name: "multiple metrics with invalid datadog utf8 tag values",
 			in:   "foo:200|c|#tag:value\nfoo:300|c|#tag:\xc3\x28invalid",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      200,
-					labels:     map[string]string{"tag": "value"},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      200,
+					CLabels:     map[string]string{"tag": "value"},
 				},
 			},
 		}, {
 			name: "combined multiline metrics",
 			in:   "foo:200|ms:300|ms:5|c|@0.1:6|g\nbar:1|c:5|ms",
-			out: Events{
-				&TimerEvent{
-					metricName: "foo",
-					value:      200,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      .200,
+					OLabels:     map[string]string{},
 				},
-				&TimerEvent{
-					metricName: "foo",
-					value:      300,
-					labels:     map[string]string{},
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      .300,
+					OLabels:     map[string]string{},
 				},
-				&CounterEvent{
-					metricName: "foo",
-					value:      50,
-					labels:     map[string]string{},
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      50,
+					CLabels:     map[string]string{},
 				},
-				&GaugeEvent{
-					metricName: "foo",
-					value:      6,
-					labels:     map[string]string{},
+				&event.GaugeEvent{
+					GMetricName: "foo",
+					GValue:      6,
+					GLabels:     map[string]string{},
 				},
-				&CounterEvent{
-					metricName: "bar",
-					value:      1,
-					labels:     map[string]string{},
+				&event.CounterEvent{
+					CMetricName: "bar",
+					CValue:      1,
+					CLabels:     map[string]string{},
 				},
-				&TimerEvent{
-					metricName: "bar",
-					value:      5,
-					labels:     map[string]string{},
+				&event.ObserverEvent{
+					OMetricName: "bar",
+					OValue:      .005,
+					OLabels:     map[string]string{},
 				},
 			},
 		}, {
 			name: "timings with sampling factor",
 			in:   "foo.timing:0.5|ms|@0.1",
-			out: Events{
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
-				&TimerEvent{metricName: "foo.timing", value: 0.5, labels: map[string]string{}},
+			out: event.Events{
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
+				&event.ObserverEvent{OMetricName: "foo.timing", OValue: 0.0005, OLabels: map[string]string{}},
 			},
 		}, {
 			name: "bad line",
@@ -225,21 +507,21 @@ func TestHandlePacket(t *testing.T) {
 		}, {
 			name: "illegal sampling factor",
 			in:   "foo:1|c|@bar",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      1,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      1,
+					CLabels:     map[string]string{},
 				},
 			},
 		}, {
 			name: "zero sampling factor",
 			in:   "foo:2|c|@0",
-			out: Events{
-				&CounterEvent{
-					metricName: "foo",
-					value:      2,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "foo",
+					CValue:      2,
+					CLabels:     map[string]string{},
 				},
 			},
 		}, {
@@ -261,25 +543,89 @@ func TestHandlePacket(t *testing.T) {
 		{
 			name: "some invalid utf8",
 			in:   "valid_utf8:1|c\ninvalid\xc3\x28utf8:1|c",
-			out: Events{
-				&CounterEvent{
-					metricName: "valid_utf8",
-					value:      1,
-					labels:     map[string]string{},
+			out: event.Events{
+				&event.CounterEvent{
+					CMetricName: "valid_utf8",
+					CValue:      1,
+					CLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "ms timer with conversion to seconds",
+			in:   "foo:200|ms",
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      0.2,
+					OLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "histogram with no unit conversion",
+			in:   "foo:200|h",
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      200,
+					OLabels:     map[string]string{},
+				},
+			},
+		}, {
+			name: "distribution with no unit conversion",
+			in:   "foo:200|d",
+			out: event.Events{
+				&event.ObserverEvent{
+					OMetricName: "foo",
+					OValue:      200,
+					OLabels:     map[string]string{},
 				},
 			},
 		},
 	}
 
-	for k, l := range []statsDPacketHandler{&StatsDUDPListener{}, &mockStatsDTCPListener{}} {
-		events := make(chan Events, 32)
+	parser := line.NewParser()
+	parser.EnableDogstatsdParsing()
+	parser.EnableInfluxdbParsing()
+	parser.EnableLibratoParsing()
+	parser.EnableSignalFXParsing()
+
+	for k, l := range []statsDPacketHandler{&listener.StatsDUDPListener{
+		Conn:            nil,
+		EventHandler:    nil,
+		Logger:          log.NewNopLogger(),
+		LineParser:      parser,
+		UDPPackets:      udpPackets,
+		UDPPacketDrops:  udpPacketDrops,
+		LinesReceived:   linesReceived,
+		EventsFlushed:   eventsFlushed,
+		SampleErrors:    *sampleErrors,
+		SamplesReceived: samplesReceived,
+		TagErrors:       tagErrors,
+		TagsReceived:    tagsReceived,
+	}, &mockStatsDTCPListener{listener.StatsDTCPListener{
+		Conn:            nil,
+		EventHandler:    nil,
+		Logger:          log.NewNopLogger(),
+		LineParser:      parser,
+		LinesReceived:   linesReceived,
+		EventsFlushed:   eventsFlushed,
+		SampleErrors:    *sampleErrors,
+		SamplesReceived: samplesReceived,
+		TagErrors:       tagErrors,
+		TagsReceived:    tagsReceived,
+		TCPConnections:  tcpConnections,
+		TCPErrors:       tcpErrors,
+		TCPLineTooLong:  tcpLineTooLong,
+	}, log.NewNopLogger()}} {
+		events := make(chan event.Events, 32)
+		l.SetEventHandler(&event.UnbufferedEventHandler{C: events})
 		for i, scenario := range scenarios {
-			l.handlePacket([]byte(scenario.in), events)
+			l.HandlePacket([]byte(scenario.in))
 
 			le := len(events)
 			// Flatten actual events.
-			actual := Events{}
-			for i := 0; i < le; i++ {
+			actual := event.Events{}
+			for j := 0; j < le; j++ {
 				actual = append(actual, <-events...)
 			}
 
@@ -295,3 +641,225 @@ func TestHandlePacket(t *testing.T) {
 		}
 	}
 }
+
+type statsDPacketHandler interface {
+	HandlePacket(packet []byte)
+	SetEventHandler(eh event.EventHandler)
+}
+
+type mockStatsDTCPListener struct {
+	listener.StatsDTCPListener
+	log.Logger
+}
+
+func (ml *mockStatsDTCPListener) HandlePacket(packet []byte) {
+	// Forcing IPv4 because the TravisCI build environment does not have IPv6
+	// addresses.
+	lc, err := net.ListenTCP("tcp4", nil)
+	if err != nil {
+		panic(fmt.Sprintf("mockStatsDTCPListener: listen failed: %v", err))
+	}
+
+	defer lc.Close()
+
+	go func() {
+		cc, err := net.DialTCP("tcp", nil, lc.Addr().(*net.TCPAddr))
+		if err != nil {
+			panic(fmt.Sprintf("mockStatsDTCPListener: dial failed: %v", err))
+		}
+
+		defer cc.Close()
+
+		n, err := cc.Write(packet)
+		if err != nil || n != len(packet) {
+			panic(fmt.Sprintf("mockStatsDTCPListener: write failed: %v,%d", err, n))
+		}
+	}()
+
+	sc, err := lc.AcceptTCP()
+	if err != nil {
+		panic(fmt.Sprintf("mockStatsDTCPListener: accept failed: %v", err))
+	}
+	ml.HandleConn(sc)
+}
+
+// TestTtlExpiration validates expiration of time series.
+// foobar metric without mapping should expire with default ttl of 1s
+// bazqux metric should expire with ttl of 2s
+func TestTtlExpiration(t *testing.T) {
+	// Mock a time.NewTicker
+	tickerCh := make(chan time.Time)
+	clock.ClockInstance = &clock.Clock{
+		TickerCh: tickerCh,
+	}
+
+	config := `
+defaults:
+  ttl: 1s
+mappings:
+- match: bazqux.*
+  name: bazqux
+  ttl: 2s
+`
+	// Create mapper from config and start an Exporter with a synchronous channel
+	testMapper := &mapper.MetricMapper{}
+	err := testMapper.InitFromYAMLString(config)
+	if err != nil {
+		t.Fatalf("Config load error: %s %s", config, err)
+	}
+	events := make(chan event.Events)
+	defer close(events)
+	go func() {
+		ex := exporter.NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex.Listen(events)
+	}()
+
+	ev := event.Events{
+		// event with default ttl = 1s
+		&event.GaugeEvent{
+			GMetricName: "foobar",
+			GValue:      200,
+		},
+		// event with ttl = 2s from a mapping
+		&event.ObserverEvent{
+			OMetricName: "bazqux.main",
+			OValue:      42,
+		},
+	}
+
+	var metrics []*dto.MetricFamily
+	var foobarValue *float64
+	var bazquxValue *float64
+
+	// Step 1. Send events with statsd metrics.
+	// Send empty Events to wait for events are handled.
+	// saveLabelValues will use fake instant as a lastRegisteredAt time.
+	clock.ClockInstance.Instant = time.Unix(0, 0)
+	events <- ev
+	events <- event.Events{}
+
+	// Check values
+	metrics, err = prometheus.DefaultGatherer.Gather()
+	if err != nil {
+		t.Fatal("Gather should not fail")
+	}
+	foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
+	bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
+	if foobarValue == nil || bazquxValue == nil {
+		t.Fatalf("Gauge `foobar` and Summary `bazqux` should be gathered")
+	}
+	if *foobarValue != 200 {
+		t.Fatalf("Gauge `foobar` observation %f is not expected. Should be 200", *foobarValue)
+	}
+	if *bazquxValue != 42 {
+		t.Fatalf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
+	}
+
+	// Step 2. Increase Instant to emulate metrics expiration after 1s
+	clock.ClockInstance.Instant = time.Unix(1, 10)
+	clock.ClockInstance.TickerCh <- time.Unix(0, 0)
+	events <- event.Events{}
+
+	// Check values
+	metrics, err = prometheus.DefaultGatherer.Gather()
+	if err != nil {
+		t.Fatal("Gather should not fail")
+	}
+	foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
+	bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
+	if foobarValue != nil {
+		t.Fatalf("Gauge `foobar` should be expired")
+	}
+	if bazquxValue == nil {
+		t.Fatalf("Summary `bazqux` should be gathered")
+	}
+	if *bazquxValue != 42 {
+		t.Fatalf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
+	}
+
+	// Step 3. Increase Instant to emulate metrics expiration after 2s
+	clock.ClockInstance.Instant = time.Unix(2, 200)
+	clock.ClockInstance.TickerCh <- time.Unix(0, 0)
+	events <- event.Events{}
+
+	// Check values
+	metrics, err = prometheus.DefaultGatherer.Gather()
+	if err != nil {
+		t.Fatal("Gather should not fail")
+	}
+	foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
+	bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
+	if bazquxValue != nil {
+		t.Fatalf("Summary `bazqux` should be expired")
+	}
+	if foobarValue != nil {
+		t.Fatalf("Gauge `foobar` should not be gathered after expiration")
+	}
+}
+
+// getFloat64 search for metric by name in array of MetricFamily and then search a value by labels.
+// Method returns a value or nil if metric is not found.
+func getFloat64(metrics []*dto.MetricFamily, name string, labels prometheus.Labels) *float64 {
+	var metricFamily *dto.MetricFamily
+	for _, m := range metrics {
+		if *m.Name == name {
+			metricFamily = m
+			break
+		}
+	}
+	if metricFamily == nil {
+		return nil
+	}
+
+	var metric *dto.Metric
+	labelStr := fmt.Sprintf("%v", labels)
+	for _, m := range metricFamily.Metric {
+		l := labelPairsAsLabels(m.GetLabel())
+		ls := fmt.Sprintf("%v", l)
+		if labelStr == ls {
+			metric = m
+			break
+		}
+	}
+	if metric == nil {
+		return nil
+	}
+
+	var value float64
+	if metric.Gauge != nil {
+		value = metric.Gauge.GetValue()
+		return &value
+	}
+	if metric.Counter != nil {
+		value = metric.Counter.GetValue()
+		return &value
+	}
+	if metric.Histogram != nil {
+		value = metric.Histogram.GetSampleSum()
+		return &value
+	}
+	if metric.Summary != nil {
+		value = metric.Summary.GetSampleSum()
+		return &value
+	}
+	if metric.Untyped != nil {
+		value = metric.Untyped.GetValue()
+		return &value
+	}
+	panic(fmt.Errorf("collected a non-gauge/counter/histogram/summary/untyped metric: %s", metric))
+}
+
+func labelPairsAsLabels(pairs []*dto.LabelPair) (labels prometheus.Labels) {
+	labels = prometheus.Labels{}
+	for _, pair := range pairs {
+		if pair.Name == nil {
+			continue
+		}
+		value := ""
+		if pair.Value != nil {
+			value = *pair.Value
+		}
+		labels[*pair.Name] = value
+	}
+	return
+}

exporter.go

@@ -1,704 +0,0 @@
-// Copyright 2013 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package main
-
-import (
-	"bufio"
-	"bytes"
-	"encoding/binary"
-	"fmt"
-	"hash/fnv"
-	"io"
-	"net"
-	"regexp"
-	"sort"
-	"strconv"
-	"strings"
-	"time"
-	"unicode/utf8"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/common/log"
-	"github.com/prometheus/common/model"
-
-	"github.com/prometheus/statsd_exporter/pkg/clock"
-	"github.com/prometheus/statsd_exporter/pkg/mapper"
-)
-
-const (
-	defaultHelp = "Metric autogenerated by statsd_exporter."
-	regErrF     = "A change of configuration created inconsistent metrics for " +
-		"%q. You have to restart the statsd_exporter, and you should " +
-		"consider the effects on your monitoring setup. Error: %s"
-)
-
-var (
-	illegalCharsRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
-
-	hash   = fnv.New64a()
-	strBuf bytes.Buffer // Used for hashing.
-	intBuf = make([]byte, 8)
-)
-
-func labelNames(labels prometheus.Labels) []string {
-	names := make([]string, 0, len(labels))
-	for labelName := range labels {
-		names = append(names, labelName)
-	}
-	sort.Strings(names)
-	return names
-}
-
-// hashNameAndLabels returns a hash value of the provided name string and all
-// the label names and values in the provided labels map.
-//
-// Not safe for concurrent use! (Uses a shared buffer and hasher to save on
-// allocations.)
-func hashNameAndLabels(name string, labels prometheus.Labels) uint64 {
-	hash.Reset()
-	strBuf.Reset()
-	strBuf.WriteString(name)
-	hash.Write(strBuf.Bytes())
-	binary.BigEndian.PutUint64(intBuf, model.LabelsToSignature(labels))
-	hash.Write(intBuf)
-	return hash.Sum64()
-}
-
-type CounterContainer struct {
-	//           metric name
-	Elements map[string]*prometheus.CounterVec
-}
-
-func NewCounterContainer() *CounterContainer {
-	return &CounterContainer{
-		Elements: make(map[string]*prometheus.CounterVec),
-	}
-}
-
-func (c *CounterContainer) Get(metricName string, labels prometheus.Labels, help string) (prometheus.Counter, error) {
-	counterVec, ok := c.Elements[metricName]
-	if !ok {
-		counterVec = prometheus.NewCounterVec(prometheus.CounterOpts{
-			Name: metricName,
-			Help: help,
-		}, labelNames(labels))
-		if err := prometheus.Register(counterVec); err != nil {
-			return nil, err
-		}
-		c.Elements[metricName] = counterVec
-	}
-	return counterVec.GetMetricWith(labels)
-}
-
-func (c *CounterContainer) Delete(metricName string, labels prometheus.Labels) {
-	if _, ok := c.Elements[metricName]; ok {
-		c.Elements[metricName].Delete(labels)
-	}
-}
-
-type GaugeContainer struct {
-	Elements map[string]*prometheus.GaugeVec
-}
-
-func NewGaugeContainer() *GaugeContainer {
-	return &GaugeContainer{
-		Elements: make(map[string]*prometheus.GaugeVec),
-	}
-}
-
-func (c *GaugeContainer) Get(metricName string, labels prometheus.Labels, help string) (prometheus.Gauge, error) {
-	gaugeVec, ok := c.Elements[metricName]
-	if !ok {
-		gaugeVec = prometheus.NewGaugeVec(prometheus.GaugeOpts{
-			Name: metricName,
-			Help: help,
-		}, labelNames(labels))
-		if err := prometheus.Register(gaugeVec); err != nil {
-			return nil, err
-		}
-		c.Elements[metricName] = gaugeVec
-	}
-	return gaugeVec.GetMetricWith(labels)
-}
-
-func (c *GaugeContainer) Delete(metricName string, labels prometheus.Labels) {
-	if _, ok := c.Elements[metricName]; ok {
-		c.Elements[metricName].Delete(labels)
-	}
-}
-
-type SummaryContainer struct {
-	Elements map[string]*prometheus.SummaryVec
-	mapper   *mapper.MetricMapper
-}
-
-func NewSummaryContainer(mapper *mapper.MetricMapper) *SummaryContainer {
-	return &SummaryContainer{
-		Elements: make(map[string]*prometheus.SummaryVec),
-		mapper:   mapper,
-	}
-}
-
-func (c *SummaryContainer) Get(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping) (prometheus.Observer, error) {
-	summaryVec, ok := c.Elements[metricName]
-	if !ok {
-		quantiles := c.mapper.Defaults.Quantiles
-		if mapping != nil && mapping.Quantiles != nil && len(mapping.Quantiles) > 0 {
-			quantiles = mapping.Quantiles
-		}
-		objectives := make(map[float64]float64)
-		for _, q := range quantiles {
-			objectives[q.Quantile] = q.Error
-		}
-		summaryVec = prometheus.NewSummaryVec(
-			prometheus.SummaryOpts{
-				Name:       metricName,
-				Help:       help,
-				Objectives: objectives,
-			}, labelNames(labels))
-		if err := prometheus.Register(summaryVec); err != nil {
-			return nil, err
-		}
-		c.Elements[metricName] = summaryVec
-	}
-	return summaryVec.GetMetricWith(labels)
-}
-
-func (c *SummaryContainer) Delete(metricName string, labels prometheus.Labels) {
-	if _, ok := c.Elements[metricName]; ok {
-		c.Elements[metricName].Delete(labels)
-	}
-}
-
-type HistogramContainer struct {
-	Elements map[string]*prometheus.HistogramVec
-	mapper   *mapper.MetricMapper
-}
-
-func NewHistogramContainer(mapper *mapper.MetricMapper) *HistogramContainer {
-	return &HistogramContainer{
-		Elements: make(map[string]*prometheus.HistogramVec),
-		mapper:   mapper,
-	}
-}
-
-func (c *HistogramContainer) Get(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping) (prometheus.Observer, error) {
-	histogramVec, ok := c.Elements[metricName]
-	if !ok {
-		buckets := c.mapper.Defaults.Buckets
-		if mapping != nil && mapping.Buckets != nil && len(mapping.Buckets) > 0 {
-			buckets = mapping.Buckets
-		}
-		histogramVec = prometheus.NewHistogramVec(
-			prometheus.HistogramOpts{
-				Name:    metricName,
-				Help:    help,
-				Buckets: buckets,
-			}, labelNames(labels))
-		if err := prometheus.Register(histogramVec); err != nil {
-			return nil, err
-		}
-		c.Elements[metricName] = histogramVec
-	}
-	return histogramVec.GetMetricWith(labels)
-}
-
-func (c *HistogramContainer) Delete(metricName string, labels prometheus.Labels) {
-	if _, ok := c.Elements[metricName]; ok {
-		c.Elements[metricName].Delete(labels)
-	}
-}
-
-type Event interface {
-	MetricName() string
-	Value() float64
-	Labels() map[string]string
-	MetricType() mapper.MetricType
-}
-
-type CounterEvent struct {
-	metricName string
-	value      float64
-	labels     map[string]string
-}
-
-func (c *CounterEvent) MetricName() string            { return c.metricName }
-func (c *CounterEvent) Value() float64                { return c.value }
-func (c *CounterEvent) Labels() map[string]string     { return c.labels }
-func (c *CounterEvent) MetricType() mapper.MetricType { return mapper.MetricTypeCounter }
-
-type GaugeEvent struct {
-	metricName string
-	value      float64
-	relative   bool
-	labels     map[string]string
-}
-
-func (g *GaugeEvent) MetricName() string            { return g.metricName }
-func (g *GaugeEvent) Value() float64                { return g.value }
-func (c *GaugeEvent) Labels() map[string]string     { return c.labels }
-func (c *GaugeEvent) MetricType() mapper.MetricType { return mapper.MetricTypeGauge }
-
-type TimerEvent struct {
-	metricName string
-	value      float64
-	labels     map[string]string
-}
-
-func (t *TimerEvent) MetricName() string            { return t.metricName }
-func (t *TimerEvent) Value() float64                { return t.value }
-func (c *TimerEvent) Labels() map[string]string     { return c.labels }
-func (c *TimerEvent) MetricType() mapper.MetricType { return mapper.MetricTypeTimer }
-
-type Events []Event
-
-type LabelValues struct {
-	lastRegisteredAt time.Time
-	labels           prometheus.Labels
-	ttl              time.Duration
-}
-
-type Exporter struct {
-	Counters    *CounterContainer
-	Gauges      *GaugeContainer
-	Summaries   *SummaryContainer
-	Histograms  *HistogramContainer
-	mapper      *mapper.MetricMapper
-	labelValues map[string]map[uint64]*LabelValues
-}
-
-func escapeMetricName(metricName string) string {
-	// If a metric starts with a digit, prepend an underscore.
-	if metricName[0] >= '0' && metricName[0] <= '9' {
-		metricName = "_" + metricName
-	}
-
-	// Replace all illegal metric chars with underscores.
-	metricName = illegalCharsRE.ReplaceAllString(metricName, "_")
-	return metricName
-}
-
-// Listen handles all events sent to the given channel sequentially. It
-// terminates when the channel is closed.
-func (b *Exporter) Listen(e <-chan Events) {
-	removeStaleMetricsTicker := clock.NewTicker(time.Second)
-
-	for {
-		select {
-		case <-removeStaleMetricsTicker.C:
-			b.removeStaleMetrics()
-		case events, ok := <-e:
-			if !ok {
-				log.Debug("Channel is closed. Break out of Exporter.Listener.")
-				removeStaleMetricsTicker.Stop()
-				return
-			}
-			for _, event := range events {
-				b.handleEvent(event)
-			}
-		}
-	}
-}
-
-// handleEvent processes a single Event according to the configured mapping.
-func (b *Exporter) handleEvent(event Event) {
-	mapping, labels, present := b.mapper.GetMapping(event.MetricName(), event.MetricType())
-	if mapping == nil {
-		mapping = &mapper.MetricMapping{}
-		if b.mapper.Defaults.Ttl != 0 {
-			mapping.Ttl = b.mapper.Defaults.Ttl
-		}
-	}
-
-	if mapping.Action == mapper.ActionTypeDrop {
-		return
-	}
-
-	help := defaultHelp
-	if mapping.HelpText != "" {
-		help = mapping.HelpText
-	}
-
-	metricName := ""
-	prometheusLabels := event.Labels()
-	if present {
-		metricName = escapeMetricName(mapping.Name)
-		for label, value := range labels {
-			prometheusLabels[label] = value
-		}
-	} else {
-		eventsUnmapped.Inc()
-		metricName = escapeMetricName(event.MetricName())
-	}
-
-	switch ev := event.(type) {
-	case *CounterEvent:
-		// We don't accept negative values for counters. Incrementing the counter with a negative number
-		// will cause the exporter to panic. Instead we will warn and continue to the next event.
-		if event.Value() < 0.0 {
-			log.Debugf("Counter %q is: '%f' (counter must be non-negative value)", metricName, event.Value())
-			eventStats.WithLabelValues("illegal_negative_counter").Inc()
-			return
-		}
-
-		counter, err := b.Counters.Get(
-			metricName,
-			prometheusLabels,
-			help,
-		)
-		if err == nil {
-			counter.Add(event.Value())
-			b.saveLabelValues(metricName, prometheusLabels, mapping.Ttl)
-			eventStats.WithLabelValues("counter").Inc()
-		} else {
-			log.Debugf(regErrF, metricName, err)
-			conflictingEventStats.WithLabelValues("counter").Inc()
-		}
-
-	case *GaugeEvent:
-		gauge, err := b.Gauges.Get(
-			metricName,
-			prometheusLabels,
-			help,
-		)
-
-		if err == nil {
-			if ev.relative {
-				gauge.Add(event.Value())
-			} else {
-				gauge.Set(event.Value())
-			}
-			b.saveLabelValues(metricName, prometheusLabels, mapping.Ttl)
-			eventStats.WithLabelValues("gauge").Inc()
-		} else {
-			log.Debugf(regErrF, metricName, err)
-			conflictingEventStats.WithLabelValues("gauge").Inc()
-		}
-
-	case *TimerEvent:
-		t := mapper.TimerTypeDefault
-		if mapping != nil {
-			t = mapping.TimerType
-		}
-		if t == mapper.TimerTypeDefault {
-			t = b.mapper.Defaults.TimerType
-		}
-
-		switch t {
-		case mapper.TimerTypeHistogram:
-			histogram, err := b.Histograms.Get(
-				metricName,
-				prometheusLabels,
-				help,
-				mapping,
-			)
-			if err == nil {
-				histogram.Observe(event.Value() / 1000) // prometheus presumes seconds, statsd millisecond
-				b.saveLabelValues(metricName, prometheusLabels, mapping.Ttl)
-				eventStats.WithLabelValues("timer").Inc()
-			} else {
-				log.Debugf(regErrF, metricName, err)
-				conflictingEventStats.WithLabelValues("timer").Inc()
-			}
-
-		case mapper.TimerTypeDefault, mapper.TimerTypeSummary:
-			summary, err := b.Summaries.Get(
-				metricName,
-				prometheusLabels,
-				help,
-				mapping,
-			)
-			if err == nil {
-				summary.Observe(event.Value() / 1000) // prometheus presumes seconds, statsd millisecond
-				b.saveLabelValues(metricName, prometheusLabels, mapping.Ttl)
-				eventStats.WithLabelValues("timer").Inc()
-			} else {
-				log.Debugf(regErrF, metricName, err)
-				conflictingEventStats.WithLabelValues("timer").Inc()
-			}
-
-		default:
-			panic(fmt.Sprintf("unknown timer type '%s'", t))
-		}
-
-	default:
-		log.Debugln("Unsupported event type")
-		eventStats.WithLabelValues("illegal").Inc()
-	}
-}
-
-// removeStaleMetrics removes label values set from metric with stale values
-func (b *Exporter) removeStaleMetrics() {
-	now := clock.Now()
-	// delete timeseries with expired ttl
-	for metricName := range b.labelValues {
-		for hash, lvs := range b.labelValues[metricName] {
-			if lvs.ttl == 0 {
-				continue
-			}
-			if lvs.lastRegisteredAt.Add(lvs.ttl).Before(now) {
-				b.Counters.Delete(metricName, lvs.labels)
-				b.Gauges.Delete(metricName, lvs.labels)
-				b.Summaries.Delete(metricName, lvs.labels)
-				b.Histograms.Delete(metricName, lvs.labels)
-				delete(b.labelValues[metricName], hash)
-			}
-		}
-	}
-}
-
-// saveLabelValues stores label values set to labelValues and update lastRegisteredAt time and ttl value
-func (b *Exporter) saveLabelValues(metricName string, labels prometheus.Labels, ttl time.Duration) {
-	metric, hasMetric := b.labelValues[metricName]
-	if !hasMetric {
-		metric = make(map[uint64]*LabelValues)
-		b.labelValues[metricName] = metric
-	}
-	hash := hashNameAndLabels(metricName, labels)
-	metricLabelValues, ok := metric[hash]
-	if !ok {
-		metricLabelValues = &LabelValues{
-			labels: labels,
-			ttl:    ttl,
-		}
-		b.labelValues[metricName][hash] = metricLabelValues
-	}
-	now := clock.Now()
-	metricLabelValues.lastRegisteredAt = now
-	// Update ttl from mapping
-	metricLabelValues.ttl = ttl
-}
-
-func NewExporter(mapper *mapper.MetricMapper) *Exporter {
-	return &Exporter{
-		Counters:    NewCounterContainer(),
-		Gauges:      NewGaugeContainer(),
-		Summaries:   NewSummaryContainer(mapper),
-		Histograms:  NewHistogramContainer(mapper),
-		mapper:      mapper,
-		labelValues: make(map[string]map[uint64]*LabelValues),
-	}
-}
-
-func buildEvent(statType, metric string, value float64, relative bool, labels map[string]string) (Event, error) {
-	switch statType {
-	case "c":
-		return &CounterEvent{
-			metricName: metric,
-			value:      float64(value),
-			labels:     labels,
-		}, nil
-	case "g":
-		return &GaugeEvent{
-			metricName: metric,
-			value:      float64(value),
-			relative:   relative,
-			labels:     labels,
-		}, nil
-	case "ms", "h":
-		return &TimerEvent{
-			metricName: metric,
-			value:      float64(value),
-			labels:     labels,
-		}, nil
-	case "s":
-		return nil, fmt.Errorf("no support for StatsD sets")
-	default:
-		return nil, fmt.Errorf("bad stat type %s", statType)
-	}
-}
-
-func parseDogStatsDTagsToLabels(component string) map[string]string {
-	labels := map[string]string{}
-	tagsReceived.Inc()
-	tags := strings.Split(component, ",")
-	for _, t := range tags {
-		t = strings.TrimPrefix(t, "#")
-		kv := strings.SplitN(t, ":", 2)
-
-		if len(kv) < 2 || len(kv[1]) == 0 {
-			tagErrors.Inc()
-			log.Debugf("Malformed or empty DogStatsD tag %s in component %s", t, component)
-			continue
-		}
-
-		labels[escapeMetricName(kv[0])] = kv[1]
-	}
-	return labels
-}
-
-func lineToEvents(line string) Events {
-	events := Events{}
-	if line == "" {
-		return events
-	}
-
-	elements := strings.SplitN(line, ":", 2)
-	if len(elements) < 2 || len(elements[0]) == 0 || !utf8.ValidString(line) {
-		sampleErrors.WithLabelValues("malformed_line").Inc()
-		log.Debugln("Bad line from StatsD:", line)
-		return events
-	}
-	metric := elements[0]
-	var samples []string
-	if strings.Contains(elements[1], "|#") {
-		// using datadog extensions, disable multi-metrics
-		samples = elements[1:]
-	} else {
-		samples = strings.Split(elements[1], ":")
-	}
-samples:
-	for _, sample := range samples {
-		samplesReceived.Inc()
-		components := strings.Split(sample, "|")
-		samplingFactor := 1.0
-		if len(components) < 2 || len(components) > 4 {
-			sampleErrors.WithLabelValues("malformed_component").Inc()
-			log.Debugln("Bad component on line:", line)
-			continue
-		}
-		valueStr, statType := components[0], components[1]
-
-		var relative = false
-		if strings.Index(valueStr, "+") == 0 || strings.Index(valueStr, "-") == 0 {
-			relative = true
-		}
-
-		value, err := strconv.ParseFloat(valueStr, 64)
-		if err != nil {
-			log.Debugf("Bad value %s on line: %s", valueStr, line)
-			sampleErrors.WithLabelValues("malformed_value").Inc()
-			continue
-		}
-
-		multiplyEvents := 1
-		labels := map[string]string{}
-		if len(components) >= 3 {
-			for _, component := range components[2:] {
-				if len(component) == 0 {
-					log.Debugln("Empty component on line: ", line)
-					sampleErrors.WithLabelValues("malformed_component").Inc()
-					continue samples
-				}
-			}
-
-			for _, component := range components[2:] {
-				switch component[0] {
-				case '@':
-					if statType != "c" && statType != "ms" {
-						log.Debugln("Illegal sampling factor for non-counter metric on line", line)
-						sampleErrors.WithLabelValues("illegal_sample_factor").Inc()
-						continue
-					}
-					samplingFactor, err = strconv.ParseFloat(component[1:], 64)
-					if err != nil {
-						log.Debugf("Invalid sampling factor %s on line %s", component[1:], line)
-						sampleErrors.WithLabelValues("invalid_sample_factor").Inc()
-					}
-					if samplingFactor == 0 {
-						samplingFactor = 1
-					}
-
-					if statType == "c" {
-						value /= samplingFactor
-					} else if statType == "ms" {
-						multiplyEvents = int(1 / samplingFactor)
-					}
-				case '#':
-					labels = parseDogStatsDTagsToLabels(component)
-				default:
-					log.Debugf("Invalid sampling factor or tag section %s on line %s", components[2], line)
-					sampleErrors.WithLabelValues("invalid_sample_factor").Inc()
-					continue
-				}
-			}
-		}
-
-		for i := 0; i < multiplyEvents; i++ {
-			event, err := buildEvent(statType, metric, value, relative, labels)
-			if err != nil {
-				log.Debugf("Error building event on line %s: %s", line, err)
-				sampleErrors.WithLabelValues("illegal_event").Inc()
-				continue
-			}
-			events = append(events, event)
-		}
-	}
-	return events
-}
-
-type StatsDUDPListener struct {
-	conn *net.UDPConn
-}
-
-func (l *StatsDUDPListener) Listen(e chan<- Events) {
-	buf := make([]byte, 65535)
-	for {
-		n, _, err := l.conn.ReadFromUDP(buf)
-		if err != nil {
-			log.Fatal(err)
-		}
-		l.handlePacket(buf[0:n], e)
-	}
-}
-
-func (l *StatsDUDPListener) handlePacket(packet []byte, e chan<- Events) {
-	udpPackets.Inc()
-	lines := strings.Split(string(packet), "\n")
-	events := Events{}
-	for _, line := range lines {
-		linesReceived.Inc()
-		events = append(events, lineToEvents(line)...)
-	}
-	e <- events
-}
-
-type StatsDTCPListener struct {
-	conn *net.TCPListener
-}
-
-func (l *StatsDTCPListener) Listen(e chan<- Events) {
-	for {
-		c, err := l.conn.AcceptTCP()
-		if err != nil {
-			log.Fatalf("AcceptTCP failed: %v", err)
-		}
-		go l.handleConn(c, e)
-	}
-}
-
-func (l *StatsDTCPListener) handleConn(c *net.TCPConn, e chan<- Events) {
-	defer c.Close()
-
-	tcpConnections.Inc()
-
-	r := bufio.NewReader(c)
-	for {
-		line, isPrefix, err := r.ReadLine()
-		if err != nil {
-			if err != io.EOF {
-				tcpErrors.Inc()
-				log.Debugf("Read %s failed: %v", c.RemoteAddr(), err)
-			}
-			break
-		}
-		if isPrefix {
-			tcpLineTooLong.Inc()
-			log.Debugf("Read %s failed: line too long", c.RemoteAddr())
-			break
-		}
-		linesReceived.Inc()
-		e <- lineToEvents(string(line))
-	}
-}

exporter_benchmark_test.go

@@ -16,9 +16,19 @@ package main
 import (
 	"fmt"
 	"testing"
+
+	"github.com/go-kit/log"
+
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/prometheus/statsd_exporter/pkg/event"
+	"github.com/prometheus/statsd_exporter/pkg/exporter"
+	"github.com/prometheus/statsd_exporter/pkg/line"
+	"github.com/prometheus/statsd_exporter/pkg/listener"
+	"github.com/prometheus/statsd_exporter/pkg/mapper"
 )
 
-func benchmarkExporter(times int, b *testing.B) {
+func benchmarkUDPListener(times int, b *testing.B) {
 	input := []string{
 		"foo1:2|c",
 		"foo2:3|g",
@@ -28,34 +38,164 @@ func benchmarkExporter(times int, b *testing.B) {
 		"foo6:100|c|#09digits:0,tag.with.dots:1",
 		"foo10:100|c|@0.1|#tag1:bar,#tag2:baz",
 		"foo11:100|c|@0.1|#tag1:foo:bar",
+		"foo.[foo=bar,dim=val]test:1|g",
 		"foo15:200|ms:300|ms:5|c|@0.1:6|g\nfoo15a:1|c:5|ms",
 		"some_very_useful_metrics_with_quite_a_log_name:13|c",
 	}
 	bytesInput := make([]string, len(input)*times)
+	logger := log.NewNopLogger()
 	for run := 0; run < times; run++ {
 		for i := 0; i < len(input); i++ {
 			bytesInput[run*len(input)+i] = fmt.Sprintf("run%d%s", run, input[i])
 		}
 	}
+
+	parser := line.NewParser()
+	parser.EnableDogstatsdParsing()
+	parser.EnableInfluxdbParsing()
+	parser.EnableLibratoParsing()
+	parser.EnableSignalFXParsing()
+
+	// reset benchmark timer to not measure startup costs
+	b.ResetTimer()
+
 	for n := 0; n < b.N; n++ {
-		l := StatsDUDPListener{}
+		// pause benchmark timer for creating the chan and listener
+		b.StopTimer()
+
 		// there are more events than input lines, need bigger buffer
-		events := make(chan Events, len(bytesInput)*times*2)
+		events := make(chan event.Events, len(bytesInput)*times*2)
+		udpChan := make(chan []byte, len(bytesInput)*times*2)
+
+		l := listener.StatsDUDPListener{
+			EventHandler:    &event.UnbufferedEventHandler{C: events},
+			Logger:          logger,
+			LineParser:      parser,
+			UDPPackets:      udpPackets,
+			LinesReceived:   linesReceived,
+			SamplesReceived: samplesReceived,
+			TagsReceived:    tagsReceived,
+			UdpPacketQueue:  udpChan,
+		}
+
+		// resume benchmark timer
+		b.StartTimer()
 
 		for i := 0; i < times; i++ {
 			for _, line := range bytesInput {
-				l.handlePacket([]byte(line), events)
+				l.HandlePacket([]byte(line))
 			}
 		}
 	}
 }
 
-func BenchmarkExporter1(b *testing.B) {
-	benchmarkExporter(1, b)
+func BenchmarkUDPListener1(b *testing.B) {
+	benchmarkUDPListener(1, b)
 }
-func BenchmarkExporter5(b *testing.B) {
-	benchmarkExporter(5, b)
+func BenchmarkUDPListener5(b *testing.B) {
+	benchmarkUDPListener(5, b)
 }
-func BenchmarkExporter50(b *testing.B) {
-	benchmarkExporter(50, b)
+func BenchmarkUDPListener50(b *testing.B) {
+	benchmarkUDPListener(50, b)
+}
+
+func BenchmarkExporterListener(b *testing.B) {
+	events := event.Events{
+		&event.CounterEvent{ // simple counter
+			CMetricName: "counter",
+			CValue:      2,
+		},
+		&event.GaugeEvent{ // simple gauge
+			GMetricName: "gauge",
+			GValue:      10,
+		},
+		&event.ObserverEvent{ // simple timer
+			OMetricName: "timer",
+			OValue:      200,
+		},
+		&event.ObserverEvent{ // simple histogram
+			OMetricName: "histogram.test",
+			OValue:      200,
+		},
+		&event.CounterEvent{ // simple_tags
+			CMetricName: "simple_tags",
+			CValue:      100,
+			CLabels: map[string]string{
+				"alpha": "bar",
+				"bravo": "baz",
+			},
+		},
+		&event.CounterEvent{ // slightly different tags
+			CMetricName: "simple_tags",
+			CValue:      100,
+			CLabels: map[string]string{
+				"alpha":   "bar",
+				"charlie": "baz",
+			},
+		},
+		&event.CounterEvent{ // and even more different tags
+			CMetricName: "simple_tags",
+			CValue:      100,
+			CLabels: map[string]string{
+				"alpha": "bar",
+				"bravo": "baz",
+				"golf":  "looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong",
+			},
+		},
+		&event.CounterEvent{ // datadog tag extension with complex tags
+			CMetricName: "foo",
+			CValue:      100,
+			CLabels: map[string]string{
+				"action":                "test",
+				"application":           "testapp",
+				"application_component": "testcomp",
+				"application_role":      "test_role",
+				"category":              "category",
+				"controller":            "controller",
+				"deployed_to":           "production",
+				"kube_deployment":       "deploy",
+				"kube_namespace":        "kube-production",
+				"method":                "get",
+				"version":               "5.2.8374",
+				"status":                "200",
+				"status_range":          "2xx",
+			},
+		},
+	}
+	config := `
+mappings:
+- match: histogram.test
+  timer_type: histogram
+  name: "histogram_test"
+`
+
+	testMapper := &mapper.MetricMapper{}
+	err := testMapper.InitFromYAMLString(config)
+	if err != nil {
+		b.Fatalf("Config load error: %s %s", config, err)
+	}
+
+	ex := exporter.NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+
+	// reset benchmark timer to not measure startup costs
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		// pause benchmark timer for creating the chan
+		b.StopTimer()
+
+		ec := make(chan event.Events, 1000)
+
+		// resume benchmark timer
+		b.StartTimer()
+
+		go func() {
+			for i := 0; i < 1000; i++ {
+				ec <- events
+			}
+			close(ec)
+		}()
+
+		ex.Listen(ec)
+	}
 }

exporter_test.go

@@ -1,357 +0,0 @@
-// Copyright 2013 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package main
-
-import (
-	"fmt"
-	"net"
-	"testing"
-	"time"
-
-	"github.com/prometheus/client_golang/prometheus"
-	dto "github.com/prometheus/client_model/go"
-
-	"github.com/prometheus/statsd_exporter/pkg/clock"
-	"github.com/prometheus/statsd_exporter/pkg/mapper"
-)
-
-// TestNegativeCounter validates when we send a negative
-// number to a counter that we no longer panic the Exporter Listener.
-func TestNegativeCounter(t *testing.T) {
-	defer func() {
-		if e := recover(); e != nil {
-			err := e.(error)
-			if err.Error() == "counter cannot decrease in value" {
-				t.Fatalf("Counter was negative and causes a panic.")
-			} else {
-				t.Fatalf("Unknown panic and error: %q", err.Error())
-			}
-		}
-	}()
-
-	events := make(chan Events)
-	go func() {
-		c := Events{
-			&CounterEvent{
-				metricName: "foo",
-				value:      -1,
-			},
-		}
-		events <- c
-		close(events)
-	}()
-
-	ex := NewExporter(&mapper.MetricMapper{})
-	ex.Listen(events)
-}
-
-// TestInvalidUtf8InDatadogTagValue validates robustness of exporter listener
-// against datadog tags with invalid tag values.
-// It sends the same tags first with a valid value, then with an invalid one.
-// The exporter should not panic, but drop the invalid event
-func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
-	defer func() {
-		if e := recover(); e != nil {
-			err := e.(error)
-			t.Fatalf("Exporter listener should not panic on bad utf8: %q", err.Error())
-		}
-	}()
-
-	events := make(chan Events)
-
-	go func() {
-		for _, l := range []statsDPacketHandler{&StatsDUDPListener{}, &mockStatsDTCPListener{}} {
-			l.handlePacket([]byte("bar:200|c|#tag:value\nbar:200|c|#tag:\xc3\x28invalid"), events)
-		}
-		close(events)
-	}()
-
-	ex := NewExporter(&mapper.MetricMapper{})
-	ex.Listen(events)
-}
-
-func TestHistogramUnits(t *testing.T) {
-	// Start exporter with a synchronous channel
-	events := make(chan Events)
-	go func() {
-		ex := NewExporter(&mapper.MetricMapper{})
-		ex.mapper.Defaults.TimerType = mapper.TimerTypeHistogram
-		ex.Listen(events)
-	}()
-
-	// Synchronously send a statsd event to wait for handleEvent execution.
-	// Then close events channel to stop a listener.
-	name := "foo"
-	c := Events{
-		&TimerEvent{
-			metricName: name,
-			value:      300,
-		},
-	}
-	events <- c
-	events <- Events{}
-	close(events)
-
-	// Check histogram value
-	metrics, err := prometheus.DefaultGatherer.Gather()
-	if err != nil {
-		t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
-	}
-	value := getFloat64(metrics, name, prometheus.Labels{})
-	if value == nil {
-		t.Fatal("Histogram value should not be nil")
-	}
-	if *value == 300 {
-		t.Fatalf("Histogram observations not scaled into Seconds")
-	} else if *value != .300 {
-		t.Fatalf("Received unexpected value for histogram observation %f != .300", *value)
-	}
-}
-
-type statsDPacketHandler interface {
-	handlePacket(packet []byte, e chan<- Events)
-}
-
-type mockStatsDTCPListener struct {
-	StatsDTCPListener
-}
-
-func (ml *mockStatsDTCPListener) handlePacket(packet []byte, e chan<- Events) {
-	// Forcing IPv4 because the TravisCI build environment does not have IPv6
-	// addresses.
-	lc, err := net.ListenTCP("tcp4", nil)
-	if err != nil {
-		panic(fmt.Sprintf("mockStatsDTCPListener: listen failed: %v", err))
-	}
-
-	defer lc.Close()
-
-	go func() {
-		cc, err := net.DialTCP("tcp", nil, lc.Addr().(*net.TCPAddr))
-		if err != nil {
-			panic(fmt.Sprintf("mockStatsDTCPListener: dial failed: %v", err))
-		}
-
-		defer cc.Close()
-
-		n, err := cc.Write(packet)
-		if err != nil || n != len(packet) {
-			panic(fmt.Sprintf("mockStatsDTCPListener: write failed: %v,%d", err, n))
-		}
-	}()
-
-	sc, err := lc.AcceptTCP()
-	if err != nil {
-		panic(fmt.Sprintf("mockStatsDTCPListener: accept failed: %v", err))
-	}
-	ml.handleConn(sc, e)
-}
-
-func TestEscapeMetricName(t *testing.T) {
-	scenarios := map[string]string{
-		"clean":                   "clean",
-		"0starts_with_digit":      "_0starts_with_digit",
-		"with_underscore":         "with_underscore",
-		"with.dot":                "with_dot",
-		"with😱emoji":              "with_emoji",
-		"with.*.multiple":         "with___multiple",
-		"test.web-server.foo.bar": "test_web_server_foo_bar",
-	}
-
-	for in, want := range scenarios {
-		if got := escapeMetricName(in); want != got {
-			t.Errorf("expected `%s` to be escaped to `%s`, got `%s`", in, want, got)
-		}
-	}
-}
-
-// TestTtlExpiration validates expiration of time series.
-// foobar metric without mapping should expire with default ttl of 1s
-// bazqux metric should expire with ttl of 2s
-func TestTtlExpiration(t *testing.T) {
-	// Mock a time.NewTicker
-	tickerCh := make(chan time.Time)
-	clock.ClockInstance = &clock.Clock{
-		TickerCh: tickerCh,
-	}
-
-	config := `
-defaults:
-  ttl: 1s
-mappings:
-- match: bazqux.*
-  name: bazqux
-  ttl: 2s
-`
-	// Create mapper from config and start an Exporter with a synchronous channel
-	testMapper := &mapper.MetricMapper{}
-	err := testMapper.InitFromYAMLString(config)
-	if err != nil {
-		t.Fatalf("Config load error: %s %s", config, err)
-	}
-	events := make(chan Events)
-	defer close(events)
-	go func() {
-		ex := NewExporter(testMapper)
-		ex.Listen(events)
-	}()
-
-	ev := Events{
-		// event with default ttl = 1s
-		&GaugeEvent{
-			metricName: "foobar",
-			value:      200,
-		},
-		// event with ttl = 2s from a mapping
-		&TimerEvent{
-			metricName: "bazqux.main",
-			value:      42000,
-		},
-	}
-
-	var metrics []*dto.MetricFamily
-	var foobarValue *float64
-	var bazquxValue *float64
-
-	// Step 1. Send events with statsd metrics.
-	// Send empty Events to wait for events are handled.
-	// saveLabelValues will use fake instant as a lastRegisteredAt time.
-	clock.ClockInstance.Instant = time.Unix(0, 0)
-	events <- ev
-	events <- Events{}
-
-	// Check values
-	metrics, err = prometheus.DefaultGatherer.Gather()
-	if err != nil {
-		t.Fatal("Gather should not fail")
-	}
-	foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
-	bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
-	if foobarValue == nil || bazquxValue == nil {
-		t.Fatalf("Gauge `foobar` and Summary `bazqux` should be gathered")
-	}
-	if *foobarValue != 200 {
-		t.Fatalf("Gauge `foobar` observation %f is not expected. Should be 200", *foobarValue)
-	}
-	if *bazquxValue != 42 {
-		t.Fatalf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
-	}
-
-	// Step 2. Increase Instant to emulate metrics expiration after 1s
-	clock.ClockInstance.Instant = time.Unix(1, 10)
-	clock.ClockInstance.TickerCh <- time.Unix(0, 0)
-	events <- Events{}
-
-	// Check values
-	metrics, err = prometheus.DefaultGatherer.Gather()
-	if err != nil {
-		t.Fatal("Gather should not fail")
-	}
-	foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
-	bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
-	if foobarValue != nil {
-		t.Fatalf("Gauge `foobar` should be expired")
-	}
-	if bazquxValue == nil {
-		t.Fatalf("Summary `bazqux` should be gathered")
-	}
-	if *bazquxValue != 42 {
-		t.Fatalf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
-	}
-
-	// Step 3. Increase Instant to emulate metrics expiration after 2s
-	clock.ClockInstance.Instant = time.Unix(2, 200)
-	clock.ClockInstance.TickerCh <- time.Unix(0, 0)
-	events <- Events{}
-
-	// Check values
-	metrics, err = prometheus.DefaultGatherer.Gather()
-	if err != nil {
-		t.Fatal("Gather should not fail")
-	}
-	foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
-	bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
-	if bazquxValue != nil {
-		t.Fatalf("Summary `bazqux` should be expired")
-	}
-	if foobarValue != nil {
-		t.Fatalf("Gauge `foobar` should not be gathered after expiration")
-	}
-}
-
-// getFloat64 search for metric by name in array of MetricFamily and then search a value by labels.
-// Method returns a value or nil if metric is not found.
-func getFloat64(metrics []*dto.MetricFamily, name string, labels prometheus.Labels) *float64 {
-	var metricFamily *dto.MetricFamily
-	for _, m := range metrics {
-		if *m.Name == name {
-			metricFamily = m
-			break
-		}
-	}
-	if metricFamily == nil {
-		return nil
-	}
-
-	var metric *dto.Metric
-	labelsHash := hashNameAndLabels(name, labels)
-	for _, m := range metricFamily.Metric {
-		h := hashNameAndLabels(name, labelPairsAsLabels(m.GetLabel()))
-		if h == labelsHash {
-			metric = m
-			break
-		}
-	}
-	if metric == nil {
-		return nil
-	}
-
-	var value float64
-	if metric.Gauge != nil {
-		value = metric.Gauge.GetValue()
-		return &value
-	}
-	if metric.Counter != nil {
-		value = metric.Counter.GetValue()
-		return &value
-	}
-	if metric.Histogram != nil {
-		value = metric.Histogram.GetSampleSum()
-		return &value
-	}
-	if metric.Summary != nil {
-		value = metric.Summary.GetSampleSum()
-		return &value
-	}
-	if metric.Untyped != nil {
-		value = metric.Untyped.GetValue()
-		return &value
-	}
-	panic(fmt.Errorf("collected a non-gauge/counter/histogram/summary/untyped metric: %s", metric))
-}
-
-func labelPairsAsLabels(pairs []*dto.LabelPair) (labels prometheus.Labels) {
-	labels = prometheus.Labels{}
-	for _, pair := range pairs {
-		if pair.Name == nil {
-			continue
-		}
-		value := ""
-		if pair.Value != nil {
-			value = *pair.Value
-		}
-		labels[*pair.Name] = value
-	}
-	return
-}

go.mod

@@ -1,28 +1,36 @@
 module github.com/prometheus/statsd_exporter
 
+go 1.20
+
 require (
-	github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38 // indirect
-	github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721 // indirect
-	github.com/alecthomas/repr v0.0.0-20181024024818-d37bc2a10ba1 // indirect
-	github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc // indirect
-	github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/howeyc/fsnotify v0.0.0-20151003194602-f0c08ee9c607
-	github.com/kr/pretty v0.1.0 // indirect
-	github.com/mattn/go-isatty v0.0.4 // indirect
-	github.com/onsi/ginkgo v1.7.0 // indirect
-	github.com/onsi/gomega v1.4.3 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_golang v0.9.2
-	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910
-	github.com/prometheus/common v0.0.0-20181126121408-4724e9255275
-	github.com/sergi/go-diff v1.0.0 // indirect
-	github.com/sirupsen/logrus v1.0.3 // indirect
-	github.com/stretchr/testify v1.2.2 // indirect
-	golang.org/x/crypto v0.0.0-20170825220121-81e90905daef // indirect
-	gopkg.in/airbrake/gobrake.v2 v2.0.9 // indirect
-	gopkg.in/alecthomas/kingpin.v2 v2.2.5
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
-	gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 // indirect
-	gopkg.in/yaml.v2 v2.2.1
+	github.com/alecthomas/kingpin/v2 v2.4.0
+	github.com/go-kit/log v0.2.1
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
+	github.com/prometheus/client_golang v1.19.0
+	github.com/prometheus/client_model v0.6.0
+	github.com/prometheus/common v0.48.0
+	github.com/prometheus/exporter-toolkit v0.11.0
+	github.com/stvp/go-udp-testing v0.0.0-20201019212854-469649b16807
+	gopkg.in/yaml.v2 v2.4.0
+)
+
+require (
+	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
+	github.com/go-logfmt/logfmt v0.6.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/xhit/go-str2duration/v2 v2.1.0 // indirect
+	golang.org/x/crypto v0.18.0 // indirect
+	golang.org/x/net v0.20.0 // indirect
+	golang.org/x/oauth2 v0.16.0 // indirect
+	golang.org/x/sync v0.5.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
 )

go.sum

@@ -1,80 +1,82 @@
-github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38 h1:smF2tmSOzy2Mm+0dGI2AIUHY+w0BUc+4tn40djz7+6U=
-github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38/go.mod h1:r7bzyVFMNntcxPZXK3/+KdruV1H5KSlyVY0gc+NgInI=
-github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721 h1:JHZL0hZKJ1VENNfmXvHbgYlbUOvpzYzvy2aZU5gXVeo=
-github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721/go.mod h1:QO9JBoKquHd+jz9nshCh40fOfO+JzsoXy8qTHF68zU0=
-github.com/alecthomas/repr v0.0.0-20181024024818-d37bc2a10ba1 h1:GDQdwm/gAcJcLAKQQZGOJ4knlw+7rfEQQcmwTbt4p5E=
-github.com/alecthomas/repr v0.0.0-20181024024818-d37bc2a10ba1/go.mod h1:xTS7Pm1pD1mvyM075QCDSRqH6qRLXylzS24ZTpRiSzQ=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc h1:cAKDfWh5VpdgMhJosfJnn5/FoN2SRZ4p7fJNX58YPaU=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf h1:qet1QNfXsQxTZqLG4oE62mJzwPIB8+Tee4RNCL9ulrY=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/alecthomas/kingpin/v2 v2.4.0 h1:f48lwail6p8zpO1bC4TxtqACaGqHYA22qkHjHpqDjYY=
+github.com/alecthomas/kingpin/v2 v2.4.0/go.mod h1:0gyi0zQnjuFk8xrkNKamJoyUo382HRL7ATRpFZCw6tE=
+github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 h1:s6gZFSlWYmbqAuRjVTiNNhvNRfY2Wxp9nhfyel4rklc=
+github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
+github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/howeyc/fsnotify v0.0.0-20151003194602-f0c08ee9c607 h1:+7wvV++11s0Okyl1dekihkIiCIYDz+Qk2LvxAShINU4=
-github.com/howeyc/fsnotify v0.0.0-20151003194602-f0c08ee9c607/go.mod h1:41HzSPxBGeFRQKEEwgh49TRw/nKBsYZ2cF1OzPjSJsA=
-github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
-github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
-github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
-github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
-github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
-github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
-github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
-github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
-github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
-github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+github.com/go-kit/log v0.2.1 h1:MRVx0/zhvdseW+Gza6N9rVzU/IVzaeE1SFI4raAhmBU=
+github.com/go-kit/log v0.2.1/go.mod h1:NwTd00d/i8cPZ3xOwwiv2PO5MOcx78fFErGNcVmBjv0=
+github.com/go-logfmt/logfmt v0.6.0 h1:wGYYu3uicYdqXVgoYbvnkrPVXkuLM1p1ifugDMEdRi4=
+github.com/go-logfmt/logfmt v0.6.0/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/jpillora/backoff v1.0.0 h1:uvFg412JmmHBHw7iwprIxkPMI+sGQ4kzOWsMeHnm2EA=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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-github.com/prometheus/common v0.0.0-20181126121408-4724e9255275 h1:PnBWHBf+6L0jOqq0gIVUe6Yk0/QMZ640k6NvkxcBf+8=
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-golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20181201002055-351d144fa1fc h1:a3CU5tJYVj92DY2LaA1kUkrsqD5/3mLDhx2NcNqyW+0=
-golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ=
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-golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e h1:o3PsSEY8E4eXWkXrIP9YJALUkVZqzHJT5DOasTyn8Vs=
-golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+github.com/prometheus/client_golang v1.19.0 h1:ygXvpU1AoN1MhdzckN+PyD9QJOSD4x7kmXYlnfbA6JU=
+github.com/prometheus/client_golang v1.19.0/go.mod h1:ZRM9uEAypZakd+q/x7+gmsvXdURP+DABIEIjnmDdp+k=
+github.com/prometheus/client_model v0.6.0 h1:k1v3CzpSRUTrKMppY35TLwPvxHqBu0bYgxZzqGIgaos=
+github.com/prometheus/client_model v0.6.0/go.mod h1:NTQHnmxFpouOD0DpvP4XujX3CdOAGQPoaGhyTchlyt8=
+github.com/prometheus/common v0.48.0 h1:QO8U2CdOzSn1BBsmXJXduaaW+dY/5QLjfB8svtSzKKE=
+github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
+github.com/prometheus/exporter-toolkit v0.11.0 h1:yNTsuZ0aNCNFQ3aFTD2uhPOvr4iD7fdBvKPAEGkNf+g=
+github.com/prometheus/exporter-toolkit v0.11.0/go.mod h1:BVnENhnNecpwoTLiABx7mrPB/OLRIgN74qlQbV+FK1Q=
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+github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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+github.com/stvp/go-udp-testing v0.0.0-20201019212854-469649b16807 h1:LUsDduamlucuNnWcaTbXQ6aLILFcLXADpOzeEH3U+OI=
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+github.com/xhit/go-str2duration/v2 v2.1.0 h1:lxklc02Drh6ynqX+DdPyp5pCKLUQpRT8bp8Ydu2Bstc=
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+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.18.0 h1:PGVlW0xEltQnzFZ55hkuX5+KLyrMYhHld1YHO4AKcdc=
+golang.org/x/crypto v0.18.0/go.mod h1:R0j02AL6hcrfOiy9T4ZYp/rcWeMxM3L6QYxlOuEG1mg=
+golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.20.0 h1:aCL9BSgETF1k+blQaYUBx9hJ9LOGP3gAVemcZlf1Kpo=
+golang.org/x/net v0.20.0/go.mod h1:z8BVo6PvndSri0LbOE3hAn0apkU+1YvI6E70E9jsnvY=
+golang.org/x/oauth2 v0.16.0 h1:aDkGMBSYxElaoP81NpoUoz2oo2R2wHdZpGToUxfyQrQ=
+golang.org/x/oauth2 v0.16.0/go.mod h1:hqZ+0LWXsiVoZpeld6jVt06P3adbS2Uu911W1SsJv2o=
+golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
+golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
+golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-gopkg.in/airbrake/gobrake.v2 v2.0.9 h1:7z2uVWwn7oVeeugY1DtlPAy5H+KYgB1KeKTnqjNatLo=
-gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
-gopkg.in/alecthomas/kingpin.v2 v2.2.5 h1:qskSCq465uEvC3oGocwvZNsO3RF3SpLVLumOAhL0bXo=
-gopkg.in/alecthomas/kingpin.v2 v2.2.5/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/appengine v1.6.7 h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=
+google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 h1:OAj3g0cR6Dx/R07QgQe8wkA9RNjB2u4i700xBkIT4e0=
-gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

line_benchmark_test.go

@@ -0,0 +1,105 @@
+// Copyright 2020 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"testing"
+
+	"github.com/go-kit/log"
+
+	"github.com/prometheus/statsd_exporter/pkg/line"
+)
+
+var (
+	// just a grab bag of mixed formats, valid, invalid
+	mixedLines = []string{
+		"foo1:2|c",
+		"foo2:3|g",
+		"foo3:200|ms",
+		"foo4:100|c|#tag1:bar,tag2:baz",
+		"foo5:100|c|#tag1:bar,#tag2:baz",
+		"foo6:100|c|#09digits:0,tag.with.dots:1",
+		"foo10:100|c|@0.1|#tag1:bar,#tag2:baz",
+		"foo11:100|c|@0.1|#tag1:foo:bar",
+		"foo.[foo=bar,dim=val]test:1|g",
+		"foo15:200|ms:300|ms:5|c|@0.1:6|g\nfoo15a:1|c:5|ms",
+		"some_very_useful_metrics_with_quite_a_log_name:13|c",
+	}
+	nopLogger = log.NewNopLogger()
+)
+
+func benchmarkLinesToEvents(times int, b *testing.B, input []string) {
+	// always report allocations since this is a hot path
+	b.ReportAllocs()
+
+	parser := line.NewParser()
+	parser.EnableDogstatsdParsing()
+	parser.EnableInfluxdbParsing()
+	parser.EnableLibratoParsing()
+	parser.EnableSignalFXParsing()
+
+	// reset benchmark timer to not measure startup costs
+	b.ResetTimer()
+
+	for n := 0; n < b.N; n++ {
+		for i := 0; i < times; i++ {
+			for _, l := range input {
+				parser.LineToEvents(l, *sampleErrors, samplesReceived, tagErrors, tagsReceived, nopLogger)
+			}
+		}
+	}
+}
+
+// Mixed statsd formats
+func BenchmarkLineToEventsMixed1(b *testing.B) {
+	benchmarkLinesToEvents(1, b, mixedLines)
+}
+func BenchmarkLineToEventsMixed5(b *testing.B) {
+	benchmarkLinesToEvents(5, b, mixedLines)
+}
+func BenchmarkLineToEventsMixed50(b *testing.B) {
+	benchmarkLinesToEvents(50, b, mixedLines)
+}
+
+func BenchmarkLineFormats(b *testing.B) {
+	input := map[string]string{
+		"statsd":           "foo1:2|c",
+		"invalidStatsd":    "foo1:2|c||",
+		"dogStatsd":        "foo1:100|c|#tag1:bar,tag2:baz",
+		"invalidDogStatsd": "foo3:100|c|#09digits:0,tag.with.dots:1",
+		"signalFx":         "foo1.[foo=bar1,dim=val1]test:1|g",
+		"invalidSignalFx":  "foo1.[foo=bar1,dim=val1test:1|g",
+		"influxDb":         "foo1,tag1=bar,tag2=baz:100|c",
+		"invalidInfluxDb":  "foo3,tag1=bar,tag2:100|c",
+	}
+
+	parser := line.NewParser()
+	parser.EnableDogstatsdParsing()
+	parser.EnableInfluxdbParsing()
+	parser.EnableLibratoParsing()
+	parser.EnableSignalFXParsing()
+
+	// reset benchmark timer to not measure startup costs
+	b.ResetTimer()
+
+	for name, l := range input {
+		b.Run(name, func(b *testing.B) {
+			// always report allocations since this is a hot path
+			b.ReportAllocs()
+			for n := 0; n < b.N; n++ {
+				parser.LineToEvents(l, *sampleErrors, samplesReceived, tagErrors, tagsReceived, nopLogger)
+			}
+		})
+	}
+}

main.go

@@ -15,200 +15,554 @@ package main
 
 import (
 	"bufio"
+	"fmt"
 	"net"
 	"net/http"
+	_ "net/http/pprof"
 	"os"
+	"os/signal"
 	"strconv"
+	"syscall"
 
-	"github.com/howeyc/fsnotify"
+	"github.com/alecthomas/kingpin/v2"
+	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/common/log"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/prometheus/common/promlog"
+	"github.com/prometheus/common/promlog/flag"
 	"github.com/prometheus/common/version"
-	"gopkg.in/alecthomas/kingpin.v2"
+	"github.com/prometheus/exporter-toolkit/web"
 
+	"github.com/prometheus/statsd_exporter/pkg/address"
+	"github.com/prometheus/statsd_exporter/pkg/event"
+	"github.com/prometheus/statsd_exporter/pkg/exporter"
+	"github.com/prometheus/statsd_exporter/pkg/level"
+	"github.com/prometheus/statsd_exporter/pkg/line"
+	"github.com/prometheus/statsd_exporter/pkg/listener"
 	"github.com/prometheus/statsd_exporter/pkg/mapper"
+	"github.com/prometheus/statsd_exporter/pkg/mappercache/lru"
+	"github.com/prometheus/statsd_exporter/pkg/mappercache/randomreplacement"
+	"github.com/prometheus/statsd_exporter/pkg/relay"
 )
 
-func init() {
-	prometheus.MustRegister(version.NewCollector("statsd_exporter"))
-}
-
-func serveHTTP(listenAddress, metricsEndpoint string) {
-	//lint:ignore SA1019 prometheus.Handler() is deprecated.
-	http.Handle(metricsEndpoint, prometheus.Handler())
-	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte(`<html>
-			<head><title>StatsD Exporter</title></head>
-			<body>
-			<h1>StatsD Exporter</h1>
-			<p><a href="` + metricsEndpoint + `">Metrics</a></p>
-			</body>
-			</html>`))
+var (
+	eventStats = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_events_total",
+			Help: "The total number of StatsD events seen.",
+		},
+		[]string{"type"},
+	)
+	eventsFlushed = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_event_queue_flushed_total",
+			Help: "Number of times events were flushed to exporter",
+		},
+	)
+	eventsUnmapped = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_events_unmapped_total",
+			Help: "The total number of StatsD events no mapping was found for.",
+		})
+	udpPackets = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_udp_packets_total",
+			Help: "The total number of StatsD packets received over UDP.",
+		},
+	)
+	udpPacketDrops = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_udp_packet_drops_total",
+			Help: "The total number of dropped StatsD packets which received over UDP.",
+		},
+	)
+	tcpConnections = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_tcp_connections_total",
+			Help: "The total number of TCP connections handled.",
+		},
+	)
+	tcpErrors = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_tcp_connection_errors_total",
+			Help: "The number of errors encountered reading from TCP.",
+		},
+	)
+	tcpLineTooLong = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_tcp_too_long_lines_total",
+			Help: "The number of lines discarded due to being too long.",
+		},
+	)
+	unixgramPackets = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_unixgram_packets_total",
+			Help: "The total number of StatsD packets received over Unixgram.",
+		},
+	)
+	linesReceived = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_lines_total",
+			Help: "The total number of StatsD lines received.",
+		},
+	)
+	samplesReceived = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_samples_total",
+			Help: "The total number of StatsD samples received.",
+		},
+	)
+	sampleErrors = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_sample_errors_total",
+			Help: "The total number of errors parsing StatsD samples.",
+		},
+		[]string{"reason"},
+	)
+	tagsReceived = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_tags_total",
+			Help: "The total number of DogStatsD tags processed.",
+		},
+	)
+	tagErrors = promauto.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_tag_errors_total",
+			Help: "The number of errors parsing DogStatsD tags.",
+		},
+	)
+	configLoads = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_config_reloads_total",
+			Help: "The number of configuration reloads.",
+		},
+		[]string{"outcome"},
+	)
+	mappingsCount = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "statsd_exporter_loaded_mappings",
+		Help: "The current number of configured metric mappings.",
 	})
-	log.Fatal(http.ListenAndServe(listenAddress, nil))
+	conflictingEventStats = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_events_conflict_total",
+			Help: "The total number of StatsD events with conflicting names.",
+		},
+		[]string{"type"},
+	)
+	errorEventStats = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_events_error_total",
+			Help: "The total number of StatsD events discarded due to errors.",
+		},
+		[]string{"reason"},
+	)
+	eventsActions = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_events_actions_total",
+			Help: "The total number of StatsD events by action.",
+		},
+		[]string{"action"},
+	)
+	metricsCount = promauto.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "statsd_exporter_metrics_total",
+			Help: "The total number of metrics.",
+		},
+		[]string{"type"},
+	)
+)
+
+func serveHTTP(mux http.Handler, listenAddress string, logger log.Logger) {
+	level.Error(logger).Log("msg", http.ListenAndServe(listenAddress, mux))
+	os.Exit(1)
 }
 
-func ipPortFromString(addr string) (*net.IPAddr, int) {
-	host, portStr, err := net.SplitHostPort(addr)
-	if err != nil {
-		log.Fatal("Bad StatsD listening address", addr)
-	}
+func sighupConfigReloader(fileName string, mapper *mapper.MetricMapper, logger log.Logger) {
+	signals := make(chan os.Signal, 1)
+	signal.Notify(signals, syscall.SIGHUP)
 
-	if host == "" {
-		host = "0.0.0.0"
-	}
-	ip, err := net.ResolveIPAddr("ip", host)
-	if err != nil {
-		log.Fatalf("Unable to resolve %s: %s", host, err)
-	}
-
-	port, err := strconv.Atoi(portStr)
-	if err != nil || port < 0 || port > 65535 {
-		log.Fatalf("Bad port %s: %s", portStr, err)
-	}
-
-	return ip, port
-}
-
-func udpAddrFromString(addr string) *net.UDPAddr {
-	ip, port := ipPortFromString(addr)
-	return &net.UDPAddr{
-		IP:   ip.IP,
-		Port: port,
-		Zone: ip.Zone,
-	}
-}
-
-func tcpAddrFromString(addr string) *net.TCPAddr {
-	ip, port := ipPortFromString(addr)
-	return &net.TCPAddr{
-		IP:   ip.IP,
-		Port: port,
-		Zone: ip.Zone,
-	}
-}
-
-func watchConfig(fileName string, mapper *mapper.MetricMapper) {
-	watcher, err := fsnotify.NewWatcher()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	err = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	for {
-		select {
-		case ev := <-watcher.Event:
-			log.Infof("Config file changed (%s), attempting reload", ev)
-			err = mapper.InitFromFile(fileName)
-			if err != nil {
-				log.Errorln("Error reloading config:", err)
-				configLoads.WithLabelValues("failure").Inc()
-			} else {
-				log.Infoln("Config reloaded successfully")
-				configLoads.WithLabelValues("success").Inc()
-			}
-			// Re-add the file watcher since it can get lost on some changes. E.g.
-			// saving a file with vim results in a RENAME-MODIFY-DELETE event
-			// sequence, after which the newly written file is no longer watched.
-			_ = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
-		case err := <-watcher.Error:
-			log.Errorln("Error watching config:", err)
+	for s := range signals {
+		if fileName == "" {
+			level.Warn(logger).Log("msg", "Received signal but no mapping config to reload", "signal", s)
+			continue
 		}
+
+		level.Info(logger).Log("msg", "Received signal, attempting reload", "signal", s)
+
+		reloadConfig(fileName, mapper, logger)
 	}
 }
 
-func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string) error {
+func reloadConfig(fileName string, mapper *mapper.MetricMapper, logger log.Logger) {
+	err := mapper.InitFromFile(fileName)
+	if err != nil {
+		level.Info(logger).Log("msg", "Error reloading config", "error", err)
+		configLoads.WithLabelValues("failure").Inc()
+	} else {
+		level.Info(logger).Log("msg", "Config reloaded successfully")
+		configLoads.WithLabelValues("success").Inc()
+	}
+}
+
+func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string, logger log.Logger) error {
 	f, err := os.Create(dumpFilename)
 	if err != nil {
 		return err
 	}
-	log.Infoln("Start dumping FSM to", dumpFilename)
+	level.Info(logger).Log("msg", "Start dumping FSM", "file_name", dumpFilename)
 	w := bufio.NewWriter(f)
 	mapper.FSM.DumpFSM(w)
 	w.Flush()
 	f.Close()
-	log.Infoln("Finish dumping FSM")
+	level.Info(logger).Log("msg", "Finish dumping FSM")
 	return nil
 }
 
+func getCache(cacheSize int, cacheType string, registerer prometheus.Registerer) (mapper.MetricMapperCache, error) {
+	var cache mapper.MetricMapperCache
+	var err error
+	if cacheSize == 0 {
+		return nil, nil
+	} else {
+		switch cacheType {
+		case "lru":
+			cache, err = lru.NewMetricMapperLRUCache(registerer, cacheSize)
+		case "random":
+			cache, err = randomreplacement.NewMetricMapperRRCache(registerer, cacheSize)
+		default:
+			err = fmt.Errorf("unsupported cache type %q", cacheType)
+		}
+
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return cache, nil
+}
+
 func main() {
 	var (
-		listenAddress   = kingpin.Flag("web.listen-address", "The address on which to expose the web interface and generated Prometheus metrics.").Default(":9102").String()
-		metricsEndpoint = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
-		statsdListenUDP = kingpin.Flag("statsd.listen-udp", "The UDP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
-		statsdListenTCP = kingpin.Flag("statsd.listen-tcp", "The TCP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
-		mappingConfig   = kingpin.Flag("statsd.mapping-config", "Metric mapping configuration file name.").String()
-		readBuffer      = kingpin.Flag("statsd.read-buffer", "Size (in bytes) of the operating system's transmit read buffer associated with the UDP connection. Please make sure the kernel parameters net.core.rmem_max is set to a value greater than the value specified.").Int()
-		dumpFSMPath     = kingpin.Flag("debug.dump-fsm", "The path to dump internal FSM generated for glob matching as Dot file.").Default("").String()
+		listenAddress        = kingpin.Flag("web.listen-address", "The address on which to expose the web interface and generated Prometheus metrics.").Default(":9102").String()
+		enableLifecycle      = kingpin.Flag("web.enable-lifecycle", "Enable shutdown and reload via HTTP request.").Default("false").Bool()
+		metricsEndpoint      = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
+		statsdListenUDP      = kingpin.Flag("statsd.listen-udp", "The UDP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
+		statsdListenTCP      = kingpin.Flag("statsd.listen-tcp", "The TCP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
+		statsdListenUnixgram = kingpin.Flag("statsd.listen-unixgram", "The Unixgram socket path to receive statsd metric lines in datagram. \"\" disables it.").Default("").String()
+		// not using Int here because flag displays default in decimal, 0755 will show as 493
+		statsdUnixSocketMode = kingpin.Flag("statsd.unixsocket-mode", "The permission mode of the unix socket.").Default("755").String()
+		mappingConfig        = kingpin.Flag("statsd.mapping-config", "Metric mapping configuration file name.").String()
+		readBuffer           = kingpin.Flag("statsd.read-buffer", "Size (in bytes) of the operating system's transmit read buffer associated with the UDP or Unixgram connection. Please make sure the kernel parameters net.core.rmem_max is set to a value greater than the value specified.").Int()
+		cacheSize            = kingpin.Flag("statsd.cache-size", "Maximum size of your metric mapping cache. Relies on least recently used replacement policy if max size is reached.").Default("1000").Int()
+		cacheType            = kingpin.Flag("statsd.cache-type", "Metric mapping cache type. Valid options are \"lru\" and \"random\"").Default("lru").Enum("lru", "random")
+		eventQueueSize       = kingpin.Flag("statsd.event-queue-size", "Size of internal queue for processing events.").Default("10000").Uint()
+		eventFlushThreshold  = kingpin.Flag("statsd.event-flush-threshold", "Number of events to hold in queue before flushing.").Default("1000").Int()
+		eventFlushInterval   = kingpin.Flag("statsd.event-flush-interval", "Maximum time between event queue flushes.").Default("200ms").Duration()
+		dumpFSMPath          = kingpin.Flag("debug.dump-fsm", "The path to dump internal FSM generated for glob matching as Dot file.").Default("").String()
+		checkConfig          = kingpin.Flag("check-config", "Check configuration and exit.").Default("false").Bool()
+		dogstatsdTagsEnabled = kingpin.Flag("statsd.parse-dogstatsd-tags", "Parse DogStatsd style tags. Enabled by default.").Default("true").Bool()
+		influxdbTagsEnabled  = kingpin.Flag("statsd.parse-influxdb-tags", "Parse InfluxDB style tags. Enabled by default.").Default("true").Bool()
+		libratoTagsEnabled   = kingpin.Flag("statsd.parse-librato-tags", "Parse Librato style tags. Enabled by default.").Default("true").Bool()
+		signalFXTagsEnabled  = kingpin.Flag("statsd.parse-signalfx-tags", "Parse SignalFX style tags. Enabled by default.").Default("true").Bool()
+		relayAddr            = kingpin.Flag("statsd.relay.address", "The UDP relay target address (host:port)").String()
+		relayPacketLen       = kingpin.Flag("statsd.relay.packet-length", "Maximum relay output packet length to avoid fragmentation").Default("1400").Uint()
+		udpPacketQueueSize   = kingpin.Flag("statsd.udp-packet-queue-size", "Size of internal queue for processing UDP packets.").Default("10000").Int()
 	)
 
-	log.AddFlags(kingpin.CommandLine)
+	promlogConfig := &promlog.Config{}
+	flag.AddFlags(kingpin.CommandLine, promlogConfig)
 	kingpin.Version(version.Print("statsd_exporter"))
+	kingpin.CommandLine.UsageWriter(os.Stdout)
 	kingpin.HelpFlag.Short('h')
 	kingpin.Parse()
+	logger := promlog.New(promlogConfig)
+	if err := level.SetLogLevel(promlogConfig.Level.String()); err != nil {
+		level.Error(logger).Log("msg", "failed to set log level", "error", err)
+		os.Exit(1)
+	}
+	prometheus.MustRegister(version.NewCollector("statsd_exporter"))
 
-	if *statsdListenUDP == "" && *statsdListenTCP == "" {
-		log.Fatalln("At least one of UDP/TCP listeners must be specified.")
+	parser := line.NewParser()
+	if *dogstatsdTagsEnabled {
+		parser.EnableDogstatsdParsing()
+	}
+	if *influxdbTagsEnabled {
+		parser.EnableInfluxdbParsing()
+	}
+	if *libratoTagsEnabled {
+		parser.EnableLibratoParsing()
+	}
+	if *signalFXTagsEnabled {
+		parser.EnableSignalFXParsing()
 	}
 
-	log.Infoln("Starting StatsD -> Prometheus Exporter", version.Info())
-	log.Infoln("Build context", version.BuildContext())
-	log.Infof("Accepting StatsD Traffic: UDP %v, TCP %v", *statsdListenUDP, *statsdListenTCP)
-	log.Infoln("Accepting Prometheus Requests on", *listenAddress)
+	level.Info(logger).Log("msg", "Starting StatsD -> Prometheus Exporter", "version", version.Info())
+	level.Info(logger).Log("msg", "Build context", "context", version.BuildContext())
 
-	go serveHTTP(*listenAddress, *metricsEndpoint)
-
-	events := make(chan Events, 1024)
+	events := make(chan event.Events, *eventQueueSize)
 	defer close(events)
+	eventQueue := event.NewEventQueue(events, *eventFlushThreshold, *eventFlushInterval, eventsFlushed)
+
+	thisMapper := &mapper.MetricMapper{Registerer: prometheus.DefaultRegisterer, MappingsCount: mappingsCount, Logger: logger}
+
+	cache, err := getCache(*cacheSize, *cacheType, thisMapper.Registerer)
+	if err != nil {
+		level.Error(logger).Log("msg", "Unable to setup metric mapper cache", "error", err)
+		os.Exit(1)
+	}
+	thisMapper.UseCache(cache)
+
+	if *mappingConfig != "" {
+		err := thisMapper.InitFromFile(*mappingConfig)
+		if err != nil {
+			level.Error(logger).Log("msg", "error loading config", "error", err)
+			os.Exit(1)
+		}
+		if *dumpFSMPath != "" {
+			err := dumpFSM(thisMapper, *dumpFSMPath, logger)
+			if err != nil {
+				level.Error(logger).Log("msg", "error dumping FSM", "error", err)
+				// Failure to dump the FSM is an error (the user asked for it and it
+				// didn't happen) but not fatal (the exporter is fully functional
+				// afterwards).
+			}
+		}
+	}
+
+	exporter := exporter.NewExporter(prometheus.DefaultRegisterer, thisMapper, logger, eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+
+	if *checkConfig {
+		level.Info(logger).Log("msg", "Configuration check successful, exiting")
+		return
+	}
+
+	var relayTarget *relay.Relay
+	if *relayAddr != "" {
+		var err error
+		relayTarget, err = relay.NewRelay(logger, *relayAddr, *relayPacketLen)
+		if err != nil {
+			level.Error(logger).Log("msg", "Unable to create relay", "err", err)
+			os.Exit(1)
+		}
+	}
+
+	level.Info(logger).Log("msg", "Accepting StatsD Traffic", "udp", *statsdListenUDP, "tcp", *statsdListenTCP, "unixgram", *statsdListenUnixgram)
+	level.Info(logger).Log("msg", "Accepting Prometheus Requests", "addr", *listenAddress)
+
+	if *statsdListenUDP == "" && *statsdListenTCP == "" && *statsdListenUnixgram == "" {
+		level.Error(logger).Log("At least one of UDP/TCP/Unixgram listeners must be specified.")
+		os.Exit(1)
+	}
 
 	if *statsdListenUDP != "" {
-		udpListenAddr := udpAddrFromString(*statsdListenUDP)
+		udpListenAddr, err := address.UDPAddrFromString(*statsdListenUDP)
+		if err != nil {
+			level.Error(logger).Log("msg", "invalid UDP listen address", "address", *statsdListenUDP, "error", err)
+			os.Exit(1)
+		}
 		uconn, err := net.ListenUDP("udp", udpListenAddr)
 		if err != nil {
-			log.Fatal(err)
+			level.Error(logger).Log("msg", "failed to start UDP listener", "error", err)
+			os.Exit(1)
 		}
 
 		if *readBuffer != 0 {
 			err = uconn.SetReadBuffer(*readBuffer)
 			if err != nil {
-				log.Fatal("Error setting UDP read buffer:", err)
+				level.Error(logger).Log("msg", "error setting UDP read buffer", "error", err)
+				os.Exit(1)
 			}
 		}
 
-		ul := &StatsDUDPListener{conn: uconn}
-		go ul.Listen(events)
+		udpPacketQueue := make(chan []byte, *udpPacketQueueSize)
+
+		ul := &listener.StatsDUDPListener{
+			Conn:            uconn,
+			EventHandler:    eventQueue,
+			Logger:          logger,
+			LineParser:      parser,
+			UDPPackets:      udpPackets,
+			UDPPacketDrops:  udpPacketDrops,
+			LinesReceived:   linesReceived,
+			EventsFlushed:   eventsFlushed,
+			Relay:           relayTarget,
+			SampleErrors:    *sampleErrors,
+			SamplesReceived: samplesReceived,
+			TagErrors:       tagErrors,
+			TagsReceived:    tagsReceived,
+			UdpPacketQueue:  udpPacketQueue,
+		}
+
+		go ul.Listen()
 	}
 
 	if *statsdListenTCP != "" {
-		tcpListenAddr := tcpAddrFromString(*statsdListenTCP)
+		tcpListenAddr, err := address.TCPAddrFromString(*statsdListenTCP)
+		if err != nil {
+			level.Error(logger).Log("msg", "invalid TCP listen address", "address", *statsdListenUDP, "error", err)
+			os.Exit(1)
+		}
 		tconn, err := net.ListenTCP("tcp", tcpListenAddr)
 		if err != nil {
-			log.Fatal(err)
+			level.Error(logger).Log("msg", err)
+			os.Exit(1)
 		}
 		defer tconn.Close()
 
-		tl := &StatsDTCPListener{conn: tconn}
-		go tl.Listen(events)
+		tl := &listener.StatsDTCPListener{
+			Conn:            tconn,
+			EventHandler:    eventQueue,
+			Logger:          logger,
+			LineParser:      parser,
+			LinesReceived:   linesReceived,
+			EventsFlushed:   eventsFlushed,
+			Relay:           relayTarget,
+			SampleErrors:    *sampleErrors,
+			SamplesReceived: samplesReceived,
+			TagErrors:       tagErrors,
+			TagsReceived:    tagsReceived,
+			TCPConnections:  tcpConnections,
+			TCPErrors:       tcpErrors,
+			TCPLineTooLong:  tcpLineTooLong,
+		}
+
+		go tl.Listen()
 	}
 
-	mapper := &mapper.MetricMapper{MappingsCount: mappingsCount}
-	if *mappingConfig != "" {
-		err := mapper.InitFromFile(*mappingConfig)
-		if err != nil {
-			log.Fatal("Error loading config:", err)
+	if *statsdListenUnixgram != "" {
+		var err error
+		if _, err = os.Stat(*statsdListenUnixgram); !os.IsNotExist(err) {
+			level.Error(logger).Log("msg", "Unixgram socket already exists", "socket_name", *statsdListenUnixgram)
+			os.Exit(1)
 		}
-		if *dumpFSMPath != "" {
-			err := dumpFSM(mapper, *dumpFSMPath)
+		uxgconn, err := net.ListenUnixgram("unixgram", &net.UnixAddr{
+			Net:  "unixgram",
+			Name: *statsdListenUnixgram,
+		})
+		if err != nil {
+			level.Error(logger).Log("msg", "failed to listen on Unixgram socket", "error", err)
+			os.Exit(1)
+		}
+
+		defer uxgconn.Close()
+
+		if *readBuffer != 0 {
+			err = uxgconn.SetReadBuffer(*readBuffer)
 			if err != nil {
-				log.Fatal("Error dumping FSM:", err)
+				level.Error(logger).Log("msg", "error setting Unixgram read buffer", "error", err)
+				os.Exit(1)
+			}
+		}
+
+		ul := &listener.StatsDUnixgramListener{
+			Conn:            uxgconn,
+			EventHandler:    eventQueue,
+			Logger:          logger,
+			LineParser:      parser,
+			UnixgramPackets: unixgramPackets,
+			LinesReceived:   linesReceived,
+			EventsFlushed:   eventsFlushed,
+			Relay:           relayTarget,
+			SampleErrors:    *sampleErrors,
+			SamplesReceived: samplesReceived,
+			TagErrors:       tagErrors,
+			TagsReceived:    tagsReceived,
+		}
+
+		go ul.Listen()
+
+		// if it's an abstract unix domain socket, it won't exist on fs
+		// so we can't chmod it either
+		if _, err := os.Stat(*statsdListenUnixgram); !os.IsNotExist(err) {
+			defer os.Remove(*statsdListenUnixgram)
+
+			// convert the string to octet
+			perm, err := strconv.ParseInt("0"+string(*statsdUnixSocketMode), 8, 32)
+			if err != nil {
+				level.Warn(logger).Log("Bad permission %s: %v, ignoring\n", *statsdUnixSocketMode, err)
+			} else {
+				err = os.Chmod(*statsdListenUnixgram, os.FileMode(perm))
+				if err != nil {
+					level.Warn(logger).Log("Failed to change unixgram socket permission: %v", err)
+				}
 			}
 		}
-		go watchConfig(*mappingConfig, mapper)
 	}
-	exporter := NewExporter(mapper)
-	exporter.Listen(events)
+
+	mux := http.DefaultServeMux
+	mux.Handle(*metricsEndpoint, promhttp.Handler())
+	if *metricsEndpoint != "/" && *metricsEndpoint != "" {
+		landingConfig := web.LandingConfig{
+			Name:        "StatsD Exporter",
+			Description: "Prometheus Exporter for converting StatsD to Prometheus metrics",
+			Version:     version.Info(),
+			Links: []web.LandingLinks{
+				{
+					Address: *metricsEndpoint,
+					Text:    "Metrics",
+				},
+			},
+		}
+		landingPage, err := web.NewLandingPage(landingConfig)
+		if err != nil {
+			level.Error(logger).Log("err", err)
+			os.Exit(1)
+		}
+		mux.Handle("/", landingPage)
+	}
+
+	quitChan := make(chan struct{}, 1)
+
+	if *enableLifecycle {
+		mux.HandleFunc("/-/reload", func(w http.ResponseWriter, r *http.Request) {
+			if r.Method == http.MethodPut || r.Method == http.MethodPost {
+				fmt.Fprintf(w, "Requesting reload")
+				if *mappingConfig == "" {
+					level.Warn(logger).Log("msg", "Received lifecycle api reload but no mapping config to reload")
+					return
+				}
+				level.Info(logger).Log("msg", "Received lifecycle api reload, attempting reload")
+				reloadConfig(*mappingConfig, thisMapper, logger)
+			}
+		})
+		mux.HandleFunc("/-/quit", func(w http.ResponseWriter, r *http.Request) {
+			if r.Method == http.MethodPut || r.Method == http.MethodPost {
+				fmt.Fprintf(w, "Requesting termination... Goodbye!")
+				quitChan <- struct{}{}
+			}
+		})
+	}
+
+	mux.HandleFunc("/-/healthy", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == http.MethodGet {
+			level.Debug(logger).Log("msg", "Received health check")
+			w.WriteHeader(http.StatusOK)
+			fmt.Fprintf(w, "Statsd Exporter is Healthy.\n")
+		}
+	})
+
+	mux.HandleFunc("/-/ready", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == http.MethodGet {
+			level.Debug(logger).Log("msg", "Received ready check")
+			w.WriteHeader(http.StatusOK)
+			fmt.Fprintf(w, "Statsd Exporter is Ready.\n")
+		}
+	})
+
+	go serveHTTP(mux, *listenAddress, logger)
+
+	go sighupConfigReloader(*mappingConfig, thisMapper, logger)
+	go exporter.Listen(events)
+
+	signals := make(chan os.Signal, 1)
+	signal.Notify(signals, os.Interrupt, syscall.SIGTERM)
+
+	// quit if we get a message on either channel
+	select {
+	case sig := <-signals:
+		level.Info(logger).Log("msg", "Received os signal, exiting", "signal", sig.String())
+	case <-quitChan:
+		level.Info(logger).Log("msg", "Received lifecycle api quit, exiting")
+	}
 }

pkg/README.md

@@ -0,0 +1,3 @@
+The `pkg` directory is deprecated.
+Please do not add new packages to this directory.
+Existing packages will be moved elsewhere eventually.

pkg/address/address.go

@@ -0,0 +1,66 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package address
+
+import (
+	"fmt"
+	"net"
+	"strconv"
+)
+
+func IPPortFromString(addr string) (*net.IPAddr, int, error) {
+	host, portStr, err := net.SplitHostPort(addr)
+	if err != nil {
+		return nil, 0, fmt.Errorf("bad StatsD listening address: %s", addr)
+	}
+
+	if host == "" {
+		host = "0.0.0.0"
+	}
+	ip, err := net.ResolveIPAddr("ip", host)
+	if err != nil {
+		return nil, 0, fmt.Errorf("unable to resolve %s: %s", host, err)
+	}
+
+	port, err := strconv.Atoi(portStr)
+	if err != nil || port < 0 || port > 65535 {
+		return nil, 0, fmt.Errorf("bad port %s: %s", portStr, err)
+	}
+
+	return ip, port, nil
+}
+
+func UDPAddrFromString(addr string) (*net.UDPAddr, error) {
+	ip, port, err := IPPortFromString(addr)
+	if err != nil {
+		return nil, err
+	}
+	return &net.UDPAddr{
+		IP:   ip.IP,
+		Port: port,
+		Zone: ip.Zone,
+	}, nil
+}
+
+func TCPAddrFromString(addr string) (*net.TCPAddr, error) {
+	ip, port, err := IPPortFromString(addr)
+	if err != nil {
+		return nil, err
+	}
+	return &net.TCPAddr{
+		IP:   ip.IP,
+		Port: port,
+		Zone: ip.Zone,
+	}, nil
+}

pkg/clock/clock.go

@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package clock
 
 import (

pkg/event/event.go

@@ -0,0 +1,138 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package event
+
+import (
+	"sync"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/statsd_exporter/pkg/clock"
+	"github.com/prometheus/statsd_exporter/pkg/mapper"
+)
+
+type Event interface {
+	MetricName() string
+	Value() float64
+	Labels() map[string]string
+	MetricType() mapper.MetricType
+}
+
+type CounterEvent struct {
+	CMetricName string
+	CValue      float64
+	CLabels     map[string]string
+}
+
+func (c *CounterEvent) MetricName() string            { return c.CMetricName }
+func (c *CounterEvent) Value() float64                { return c.CValue }
+func (c *CounterEvent) Labels() map[string]string     { return c.CLabels }
+func (c *CounterEvent) MetricType() mapper.MetricType { return mapper.MetricTypeCounter }
+
+type GaugeEvent struct {
+	GMetricName string
+	GValue      float64
+	GRelative   bool
+	GLabels     map[string]string
+}
+
+func (g *GaugeEvent) MetricName() string            { return g.GMetricName }
+func (g *GaugeEvent) Value() float64                { return g.GValue }
+func (g *GaugeEvent) Labels() map[string]string     { return g.GLabels }
+func (g *GaugeEvent) MetricType() mapper.MetricType { return mapper.MetricTypeGauge }
+
+type ObserverEvent struct {
+	OMetricName string
+	OValue      float64
+	OLabels     map[string]string
+}
+
+func (o *ObserverEvent) MetricName() string            { return o.OMetricName }
+func (o *ObserverEvent) Value() float64                { return o.OValue }
+func (o *ObserverEvent) Labels() map[string]string     { return o.OLabels }
+func (o *ObserverEvent) MetricType() mapper.MetricType { return mapper.MetricTypeObserver }
+
+type Events []Event
+
+type EventQueue struct {
+	C              chan Events
+	q              Events
+	m              sync.Mutex
+	flushTicker    *time.Ticker
+	flushThreshold int
+	flushInterval  time.Duration
+	eventsFlushed  prometheus.Counter
+}
+
+type EventHandler interface {
+	Queue(event Events)
+}
+
+func NewEventQueue(c chan Events, flushThreshold int, flushInterval time.Duration, eventsFlushed prometheus.Counter) *EventQueue {
+	ticker := clock.NewTicker(flushInterval)
+	eq := &EventQueue{
+		C:              c,
+		flushThreshold: flushThreshold,
+		flushInterval:  flushInterval,
+		flushTicker:    ticker,
+		q:              make([]Event, 0, flushThreshold),
+		eventsFlushed:  eventsFlushed,
+	}
+	go func() {
+		for {
+			<-ticker.C
+			eq.Flush()
+		}
+	}()
+	return eq
+}
+
+func (eq *EventQueue) Queue(events Events) {
+	eq.m.Lock()
+	defer eq.m.Unlock()
+
+	for _, e := range events {
+		eq.q = append(eq.q, e)
+		if len(eq.q) >= eq.flushThreshold {
+			eq.FlushUnlocked()
+		}
+	}
+}
+
+func (eq *EventQueue) Flush() {
+	eq.m.Lock()
+	defer eq.m.Unlock()
+	eq.FlushUnlocked()
+}
+
+func (eq *EventQueue) FlushUnlocked() {
+	eq.C <- eq.q
+	eq.q = make([]Event, 0, cap(eq.q))
+	eq.eventsFlushed.Inc()
+}
+
+func (eq *EventQueue) Len() int {
+	eq.m.Lock()
+	defer eq.m.Unlock()
+
+	return len(eq.q)
+}
+
+type UnbufferedEventHandler struct {
+	C chan Events
+}
+
+func (ueh *UnbufferedEventHandler) Queue(events Events) {
+	ueh.C <- events
+}

pkg/event/event_test.go

@@ -0,0 +1,87 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package event
+
+import (
+	"testing"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/statsd_exporter/pkg/clock"
+)
+
+var eventsFlushed = prometheus.NewCounter(
+	prometheus.CounterOpts{
+		Name: "statsd_exporter_event_queue_flushed_total",
+		Help: "Number of times events were flushed to exporter",
+	},
+)
+
+func TestEventThresholdFlush(t *testing.T) {
+	c := make(chan Events, 100)
+	// We're not going to flush during this test, so the duration doesn't matter.
+	eq := NewEventQueue(c, 5, time.Second, eventsFlushed)
+	e := make(Events, 13)
+	go func() {
+		eq.Queue(e)
+	}()
+
+	batch := <-c
+	if len(batch) != 5 {
+		t.Fatalf("Expected event batch to be 5 elements, but got %v", len(batch))
+	}
+	batch = <-c
+	if len(batch) != 5 {
+		t.Fatalf("Expected event batch to be 5 elements, but got %v", len(batch))
+	}
+	batch = <-c
+	if len(batch) != 3 {
+		t.Fatalf("Expected event batch to be 3 elements, but got %v", len(batch))
+	}
+}
+
+func TestEventIntervalFlush(t *testing.T) {
+	// Mock a time.NewTicker
+	tickerCh := make(chan time.Time)
+	clock.ClockInstance = &clock.Clock{
+		TickerCh: tickerCh,
+	}
+	clock.ClockInstance.Instant = time.Unix(0, 0)
+
+	c := make(chan Events, 100)
+	eq := NewEventQueue(c, 1000, time.Second*1000, eventsFlushed)
+	e := make(Events, 10)
+	eq.Queue(e)
+
+	if eq.Len() != 10 {
+		t.Fatal("Expected 10 events to be queued, but got", eq.Len())
+	}
+
+	if len(eq.C) != 0 {
+		t.Fatal("Expected 0 events in the event channel, but got", len(eq.C))
+	}
+
+	// Tick time forward to trigger a flush
+	clock.ClockInstance.Instant = time.Unix(10000, 0)
+	clock.ClockInstance.TickerCh <- time.Unix(10000, 0)
+
+	events := <-eq.C
+	if eq.Len() != 0 {
+		t.Fatal("Expected 0 events to be queued, but got", eq.Len())
+	}
+
+	if len(events) != 10 {
+		t.Fatal("Expected 10 events in the event channel, but got", len(events))
+	}
+}

pkg/exporter/exporter.go

@@ -0,0 +1,212 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package exporter
+
+import (
+	"os"
+	"time"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/prometheus/statsd_exporter/pkg/clock"
+	"github.com/prometheus/statsd_exporter/pkg/event"
+	"github.com/prometheus/statsd_exporter/pkg/level"
+	"github.com/prometheus/statsd_exporter/pkg/mapper"
+	"github.com/prometheus/statsd_exporter/pkg/registry"
+)
+
+const (
+	defaultHelp = "Metric autogenerated by statsd_exporter."
+	regErrF     = "Failed to update metric"
+)
+
+type Registry interface {
+	GetCounter(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Counter, error)
+	GetGauge(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Gauge, error)
+	GetHistogram(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Observer, error)
+	GetSummary(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Observer, error)
+	RemoveStaleMetrics()
+}
+
+type Exporter struct {
+	Mapper                *mapper.MetricMapper
+	Registry              Registry
+	Logger                log.Logger
+	EventsActions         *prometheus.CounterVec
+	EventsUnmapped        prometheus.Counter
+	ErrorEventStats       *prometheus.CounterVec
+	EventStats            *prometheus.CounterVec
+	ConflictingEventStats *prometheus.CounterVec
+	MetricsCount          *prometheus.GaugeVec
+}
+
+// Listen handles all events sent to the given channel sequentially. It
+// terminates when the channel is closed.
+func (b *Exporter) Listen(e <-chan event.Events) {
+	removeStaleMetricsTicker := clock.NewTicker(time.Second)
+
+	for {
+		select {
+		case <-removeStaleMetricsTicker.C:
+			b.Registry.RemoveStaleMetrics()
+		case events, ok := <-e:
+			if !ok {
+				level.Debug(b.Logger).Log("msg", "Channel is closed. Break out of Exporter.Listener.")
+				removeStaleMetricsTicker.Stop()
+				return
+			}
+			for _, event := range events {
+				b.handleEvent(event)
+			}
+		}
+	}
+}
+
+// handleEvent processes a single Event according to the configured mapping.
+func (b *Exporter) handleEvent(thisEvent event.Event) {
+	mapping, labels, present := b.Mapper.GetMapping(thisEvent.MetricName(), thisEvent.MetricType())
+	if mapping == nil {
+		mapping = &mapper.MetricMapping{}
+		if b.Mapper.Defaults.Ttl != 0 {
+			mapping.Ttl = b.Mapper.Defaults.Ttl
+		}
+	}
+
+	if mapping.Action == mapper.ActionTypeDrop {
+		b.EventsActions.WithLabelValues("drop").Inc()
+		return
+	}
+
+	metricName := ""
+
+	help := defaultHelp
+	if mapping.HelpText != "" {
+		help = mapping.HelpText
+	}
+
+	prometheusLabels := thisEvent.Labels()
+	if present {
+		if mapping.Name == "" {
+			level.Debug(b.Logger).Log("msg", "The mapping generates an empty metric name", "metric_name", thisEvent.MetricName(), "match", mapping.Match)
+			b.ErrorEventStats.WithLabelValues("empty_metric_name").Inc()
+			return
+		}
+		metricName = mapper.EscapeMetricName(mapping.Name)
+		for label, value := range labels {
+			if _, ok := prometheusLabels[label]; mapping.HonorLabels && ok {
+				continue
+			}
+
+			prometheusLabels[label] = value
+		}
+		b.EventsActions.WithLabelValues(string(mapping.Action)).Inc()
+	} else {
+		b.EventsUnmapped.Inc()
+		metricName = mapper.EscapeMetricName(thisEvent.MetricName())
+	}
+
+	eventValue := thisEvent.Value()
+	if mapping.Scale.Set {
+		eventValue *= mapping.Scale.Val
+	}
+
+	switch ev := thisEvent.(type) {
+	case *event.CounterEvent:
+		// We don't accept negative values for counters. Incrementing the counter with a negative number
+		// will cause the exporter to panic. Instead we will warn and continue to the next event.
+		if eventValue < 0.0 {
+			level.Debug(b.Logger).Log("msg", "counter must be non-negative value", "metric", metricName, "event_value", eventValue)
+			b.ErrorEventStats.WithLabelValues("illegal_negative_counter").Inc()
+			return
+		}
+
+		counter, err := b.Registry.GetCounter(metricName, prometheusLabels, help, mapping, b.MetricsCount)
+		if err == nil {
+			counter.Add(eventValue)
+			b.EventStats.WithLabelValues("counter").Inc()
+		} else {
+			level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+			b.ConflictingEventStats.WithLabelValues("counter").Inc()
+		}
+
+	case *event.GaugeEvent:
+		gauge, err := b.Registry.GetGauge(metricName, prometheusLabels, help, mapping, b.MetricsCount)
+
+		if err == nil {
+			if ev.GRelative {
+				gauge.Add(eventValue)
+			} else {
+				gauge.Set(eventValue)
+			}
+			b.EventStats.WithLabelValues("gauge").Inc()
+		} else {
+			level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+			b.ConflictingEventStats.WithLabelValues("gauge").Inc()
+		}
+
+	case *event.ObserverEvent:
+		t := mapper.ObserverTypeDefault
+		if mapping != nil {
+			t = mapping.ObserverType
+		}
+		if t == mapper.ObserverTypeDefault {
+			t = b.Mapper.Defaults.ObserverType
+		}
+
+		switch t {
+		case mapper.ObserverTypeHistogram:
+			histogram, err := b.Registry.GetHistogram(metricName, prometheusLabels, help, mapping, b.MetricsCount)
+			if err == nil {
+				histogram.Observe(eventValue)
+				b.EventStats.WithLabelValues("observer").Inc()
+			} else {
+				level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+				b.ConflictingEventStats.WithLabelValues("observer").Inc()
+			}
+
+		case mapper.ObserverTypeDefault, mapper.ObserverTypeSummary:
+			summary, err := b.Registry.GetSummary(metricName, prometheusLabels, help, mapping, b.MetricsCount)
+			if err == nil {
+				summary.Observe(eventValue)
+				b.EventStats.WithLabelValues("observer").Inc()
+			} else {
+				level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+				b.ConflictingEventStats.WithLabelValues("observer").Inc()
+			}
+
+		default:
+			level.Error(b.Logger).Log("msg", "unknown observer type", "type", t)
+			os.Exit(1)
+		}
+
+	default:
+		level.Debug(b.Logger).Log("msg", "Unsupported event type")
+		b.EventStats.WithLabelValues("illegal").Inc()
+	}
+}
+
+func NewExporter(reg prometheus.Registerer, mapper *mapper.MetricMapper, logger log.Logger, eventsActions *prometheus.CounterVec, eventsUnmapped prometheus.Counter, errorEventStats *prometheus.CounterVec, eventStats *prometheus.CounterVec, conflictingEventStats *prometheus.CounterVec, metricsCount *prometheus.GaugeVec) *Exporter {
+	return &Exporter{
+		Mapper:                mapper,
+		Registry:              registry.NewRegistry(reg, mapper),
+		Logger:                logger,
+		EventsActions:         eventsActions,
+		EventsUnmapped:        eventsUnmapped,
+		ErrorEventStats:       errorEventStats,
+		EventStats:            eventStats,
+		ConflictingEventStats: conflictingEventStats,
+		MetricsCount:          metricsCount,
+	}
+}

pkg/level/level.go

@@ -0,0 +1,97 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package level
+
+import (
+	"fmt"
+
+	"github.com/go-kit/log"
+	"github.com/go-kit/log/level"
+)
+
+var logLevel = LevelInfo
+
+// A Level is a logging priority. Higher levels are more important.
+type Level int
+
+const (
+	// LevelDebug logs are typically voluminous, and are usually disabled in
+	// production.
+	LevelDebug Level = iota
+	// LevelInfo is the default logging priority.
+	LevelInfo
+	// LevelWarn logs are more important than Info, but don't need individual
+	// human review.
+	LevelWarn
+	// LevelError logs are high-priority. If an application is running smoothly,
+	// it shouldn't generate any error-level logs.
+	LevelError
+)
+
+var emptyLogger = &EmptyLogger{}
+
+type EmptyLogger struct{}
+
+func (l *EmptyLogger) Log(keyvals ...interface{}) error {
+	return nil
+}
+
+// SetLogLevel sets the log level.
+func SetLogLevel(level string) error {
+	switch level {
+	case "debug":
+		logLevel = LevelDebug
+	case "info":
+		logLevel = LevelInfo
+	case "warn":
+		logLevel = LevelWarn
+	case "error":
+		logLevel = LevelError
+	default:
+		return fmt.Errorf("unrecognized log level %s", level)
+	}
+	return nil
+}
+
+// Error returns a logger that includes a Key/ErrorValue pair.
+func Error(logger log.Logger) log.Logger {
+	if logLevel <= LevelError {
+		return level.Error(logger)
+	}
+	return emptyLogger
+}
+
+// Warn returns a logger that includes a Key/WarnValue pair.
+func Warn(logger log.Logger) log.Logger {
+	if logLevel <= LevelWarn {
+		return level.Warn(logger)
+	}
+	return emptyLogger
+}
+
+// Info returns a logger that includes a Key/InfoValue pair.
+func Info(logger log.Logger) log.Logger {
+	if logLevel <= LevelInfo {
+		return level.Info(logger)
+	}
+	return emptyLogger
+}
+
+// Debug returns a logger that includes a Key/DebugValue pair.
+func Debug(logger log.Logger) log.Logger {
+	if logLevel <= LevelDebug {
+		return level.Debug(logger)
+	}
+	return emptyLogger
+}

pkg/level/level_test.go

@@ -0,0 +1,110 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package level
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/go-kit/log"
+)
+
+func TestSetLogLevel(t *testing.T) {
+	tests := []struct {
+		name     string
+		level    string
+		logLevel Level
+		wantErr  bool
+	}{
+		{"wrong level", "foo", LevelInfo, true},
+		{"level debug", "debug", LevelDebug, false},
+		{"level info", "info", LevelInfo, false},
+		{"level warn", "warn", LevelWarn, false},
+		{"level error", "error", LevelError, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := SetLogLevel(tt.level); (err != nil) != tt.wantErr {
+				t.Fatalf("Expected log level to be set successfully, but got %v", err)
+			}
+			if tt.logLevel != logLevel {
+				t.Fatalf("Expected log level %v, but got %v", tt.logLevel, logLevel)
+			}
+		})
+	}
+}
+
+func TestVariousLevels(t *testing.T) {
+	tests := []struct {
+		name  string
+		level string
+		want  string
+	}{
+		{
+			"level debug",
+			"debug",
+			strings.Join([]string{
+				"level=debug log=debug",
+				"level=info log=info",
+				"level=warn log=warn",
+				"level=error log=error",
+			}, "\n"),
+		},
+		{
+			"level info",
+			"info",
+			strings.Join([]string{
+				"level=info log=info",
+				"level=warn log=warn",
+				"level=error log=error",
+			}, "\n"),
+		},
+		{
+			"level warn",
+			"warn",
+			strings.Join([]string{
+				"level=warn log=warn",
+				"level=error log=error",
+			}, "\n"),
+		},
+		{
+			"level error",
+			"error",
+			strings.Join([]string{
+				"level=error log=error",
+			}, "\n"),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			logger := log.NewLogfmtLogger(&buf)
+
+			if err := SetLogLevel(tt.level); err != nil {
+				t.Fatalf("Expected log level to be set successfully, but got %v", err)
+			}
+
+			Debug(logger).Log("log", "debug")
+			Info(logger).Log("log", "info")
+			Warn(logger).Log("log", "warn")
+			Error(logger).Log("log", "error")
+
+			got := strings.TrimSpace(buf.String())
+			if tt.want != got {
+				t.Fatalf("Expected log output %v, but got %v", tt.want, got)
+			}
+		})
+	}
+}

pkg/line/line.go

@@ -0,0 +1,316 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package line
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/prometheus/statsd_exporter/pkg/event"
+	"github.com/prometheus/statsd_exporter/pkg/level"
+	"github.com/prometheus/statsd_exporter/pkg/mapper"
+)
+
+// Parser is a struct to hold configuration for parsing behavior
+type Parser struct {
+	DogstatsdTagsEnabled bool
+	InfluxdbTagsEnabled  bool
+	LibratoTagsEnabled   bool
+	SignalFXTagsEnabled  bool
+}
+
+// NewParser returns a new line parser
+func NewParser() *Parser {
+	p := Parser{}
+	return &p
+}
+
+// EnableDogstatsdParsing option to enable dogstatsd tag parsing
+func (p *Parser) EnableDogstatsdParsing() {
+	p.DogstatsdTagsEnabled = true
+}
+
+// EnableInfluxdbParsing option to enable influxdb tag parsing
+func (p *Parser) EnableInfluxdbParsing() {
+	p.InfluxdbTagsEnabled = true
+}
+
+// EnableLibratoParsing option to enable librato tag parsing
+func (p *Parser) EnableLibratoParsing() {
+	p.LibratoTagsEnabled = true
+}
+
+// EnableSignalFXParsing option to enable signalfx tag parsing
+func (p *Parser) EnableSignalFXParsing() {
+	p.SignalFXTagsEnabled = true
+}
+
+func buildEvent(statType, metric string, value float64, relative bool, labels map[string]string) (event.Event, error) {
+	switch statType {
+	case "c":
+		return &event.CounterEvent{
+			CMetricName: metric,
+			CValue:      float64(value),
+			CLabels:     labels,
+		}, nil
+	case "g":
+		return &event.GaugeEvent{
+			GMetricName: metric,
+			GValue:      float64(value),
+			GRelative:   relative,
+			GLabels:     labels,
+		}, nil
+	case "ms":
+		return &event.ObserverEvent{
+			OMetricName: metric,
+			OValue:      float64(value) / 1000, // prometheus presumes seconds, statsd millisecond
+			OLabels:     labels,
+		}, nil
+	case "h", "d":
+		return &event.ObserverEvent{
+			OMetricName: metric,
+			OValue:      float64(value),
+			OLabels:     labels,
+		}, nil
+	case "s":
+		return nil, fmt.Errorf("no support for StatsD sets")
+	default:
+		return nil, fmt.Errorf("bad stat type %s", statType)
+	}
+}
+
+func parseTag(component, tag string, separator rune, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) {
+	// Entirely empty tag is an error
+	if len(tag) == 0 {
+		tagErrors.Inc()
+		level.Debug(logger).Log("msg", "Empty name tag", "component", component)
+		return
+	}
+
+	for i, c := range tag {
+		if c == separator {
+			k := tag[:i]
+			v := tag[i+1:]
+
+			if len(k) == 0 || len(v) == 0 {
+				// Empty key or value is an error
+				tagErrors.Inc()
+				level.Debug(logger).Log("msg", "Malformed name tag", "k", k, "v", v, "component", component)
+			} else {
+				labels[mapper.EscapeMetricName(k)] = v
+			}
+			return
+		}
+	}
+
+	// Missing separator (no value) is an error
+	tagErrors.Inc()
+	level.Debug(logger).Log("msg", "Malformed name tag", "tag", tag, "component", component)
+}
+
+func parseNameTags(component string, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) {
+	lastTagEndIndex := 0
+	for i, c := range component {
+		if c == ',' {
+			tag := component[lastTagEndIndex:i]
+			lastTagEndIndex = i + 1
+			parseTag(component, tag, '=', labels, tagErrors, logger)
+		}
+	}
+
+	// If we're not off the end of the string, add the last tag
+	if lastTagEndIndex < len(component) {
+		tag := component[lastTagEndIndex:]
+		parseTag(component, tag, '=', labels, tagErrors, logger)
+	}
+}
+
+func trimLeftHash(s string) string {
+	if s != "" && s[0] == '#' {
+		return s[1:]
+	}
+	return s
+}
+
+func (p *Parser) ParseDogStatsDTags(component string, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) {
+	if p.DogstatsdTagsEnabled {
+		lastTagEndIndex := 0
+		for i, c := range component {
+			if c == ',' {
+				tag := component[lastTagEndIndex:i]
+				lastTagEndIndex = i + 1
+				parseTag(component, trimLeftHash(tag), ':', labels, tagErrors, logger)
+			}
+		}
+
+		// If we're not off the end of the string, add the last tag
+		if lastTagEndIndex < len(component) {
+			tag := component[lastTagEndIndex:]
+			parseTag(component, trimLeftHash(tag), ':', labels, tagErrors, logger)
+		}
+	}
+}
+
+func (p *Parser) parseNameAndTags(name string, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) string {
+	if p.SignalFXTagsEnabled {
+		// check for SignalFx tags first
+		// `[` delimits start of tags by SignalFx
+		// `]` delimits end of tags by SignalFx
+		// https://docs.signalfx.com/en/latest/integrations/agent/monitors/collectd-statsd.html
+		startIdx := strings.IndexRune(name, '[')
+		endIdx := strings.IndexRune(name, ']')
+
+		switch {
+		case startIdx != -1 && endIdx != -1:
+			// good signalfx tags
+			parseNameTags(name[startIdx+1:endIdx], labels, tagErrors, logger)
+			return name[:startIdx] + name[endIdx+1:]
+		case (startIdx != -1) != (endIdx != -1):
+			// only one bracket, return unparsed
+			level.Debug(logger).Log("msg", "invalid SignalFx tags, not parsing", "metric", name)
+			tagErrors.Inc()
+			return name
+		}
+	}
+
+	for i, c := range name {
+		// `#` delimits start of tags by Librato
+		// https://www.librato.com/docs/kb/collect/collection_agents/stastd/#stat-level-tags
+		// `,` delimits start of tags by InfluxDB
+		// https://www.influxdata.com/blog/getting-started-with-sending-statsd-metrics-to-telegraf-influxdb/#introducing-influx-statsd
+		if (c == '#' && p.LibratoTagsEnabled) || (c == ',' && p.InfluxdbTagsEnabled) {
+			parseNameTags(name[i+1:], labels, tagErrors, logger)
+			return name[:i]
+		}
+	}
+	return name
+}
+
+func (p *Parser) LineToEvents(line string, sampleErrors prometheus.CounterVec, samplesReceived prometheus.Counter, tagErrors prometheus.Counter, tagsReceived prometheus.Counter, logger log.Logger) event.Events {
+	events := event.Events{}
+	if line == "" {
+		return events
+	}
+
+	elements := strings.SplitN(line, ":", 2)
+	if len(elements) < 2 || len(elements[0]) == 0 || !utf8.ValidString(line) {
+		sampleErrors.WithLabelValues("malformed_line").Inc()
+		level.Debug(logger).Log("msg", "Bad line from StatsD", "line", line)
+		return events
+	}
+
+	labels := map[string]string{}
+	metric := p.parseNameAndTags(elements[0], labels, tagErrors, logger)
+
+	var samples []string
+	if strings.Contains(elements[1], "|#") {
+		// using DogStatsD tags
+
+		// don't allow mixed tagging styles
+		if len(labels) > 0 {
+			sampleErrors.WithLabelValues("mixed_tagging_styles").Inc()
+			level.Debug(logger).Log("msg", "Bad line (multiple tagging styles) from StatsD", "line", line)
+			return events
+		}
+
+		// disable multi-metrics
+		samples = elements[1:]
+	} else {
+		samples = strings.Split(elements[1], ":")
+	}
+
+samples:
+	for _, sample := range samples {
+		samplesReceived.Inc()
+		components := strings.Split(sample, "|")
+		if len(components) < 2 || len(components) > 4 {
+			sampleErrors.WithLabelValues("malformed_component").Inc()
+			level.Debug(logger).Log("msg", "Bad component", "line", line)
+			continue
+		}
+		valueStr, statType := components[0], components[1]
+
+		var relative = false
+		if strings.Index(valueStr, "+") == 0 || strings.Index(valueStr, "-") == 0 {
+			relative = true
+		}
+
+		value, err := strconv.ParseFloat(valueStr, 64)
+		if err != nil {
+			level.Debug(logger).Log("msg", "Bad value", "value", valueStr, "line", line)
+			sampleErrors.WithLabelValues("malformed_value").Inc()
+			continue
+		}
+
+		multiplyEvents := 1
+		if len(components) >= 3 {
+			for _, component := range components[2:] {
+				if len(component) == 0 {
+					level.Debug(logger).Log("msg", "Empty component", "line", line)
+					sampleErrors.WithLabelValues("malformed_component").Inc()
+					continue samples
+				}
+			}
+
+			for _, component := range components[2:] {
+				switch component[0] {
+				case '@':
+
+					samplingFactor, err := strconv.ParseFloat(component[1:], 64)
+					if err != nil {
+						level.Debug(logger).Log("msg", "Invalid sampling factor", "component", component[1:], "line", line)
+						sampleErrors.WithLabelValues("invalid_sample_factor").Inc()
+					}
+					if samplingFactor == 0 {
+						samplingFactor = 1
+					}
+
+					if statType == "g" {
+						continue
+					} else if statType == "c" {
+						value /= samplingFactor
+					} else if statType == "ms" || statType == "h" || statType == "d" {
+						multiplyEvents = int(1 / samplingFactor)
+					}
+				case '#':
+					p.ParseDogStatsDTags(component[1:], labels, tagErrors, logger)
+				default:
+					level.Debug(logger).Log("msg", "Invalid sampling factor or tag section", "component", components[2], "line", line)
+					sampleErrors.WithLabelValues("invalid_sample_factor").Inc()
+					continue
+				}
+			}
+		}
+
+		if len(labels) > 0 {
+			tagsReceived.Inc()
+		}
+
+		for i := 0; i < multiplyEvents; i++ {
+			event, err := buildEvent(statType, metric, value, relative, labels)
+			if err != nil {
+				level.Debug(logger).Log("msg", "Error building event", "line", line, "error", err)
+				sampleErrors.WithLabelValues("illegal_event").Inc()
+				continue
+			}
+			events = append(events, event)
+		}
+	}
+	return events
+}

pkg/listener/listener.go

@@ -0,0 +1,219 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package listener
+
+import (
+	"bufio"
+	"io"
+	"net"
+	"os"
+	"strings"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/prometheus/statsd_exporter/pkg/event"
+	"github.com/prometheus/statsd_exporter/pkg/level"
+	"github.com/prometheus/statsd_exporter/pkg/relay"
+)
+
+type Parser interface {
+	LineToEvents(line string, sampleErrors prometheus.CounterVec, samplesReceived prometheus.Counter, tagErrors prometheus.Counter, tagsReceived prometheus.Counter, logger log.Logger) event.Events
+}
+
+type StatsDUDPListener struct {
+	Conn            *net.UDPConn
+	EventHandler    event.EventHandler
+	Logger          log.Logger
+	LineParser      Parser
+	UDPPackets      prometheus.Counter
+	UDPPacketDrops  prometheus.Counter
+	LinesReceived   prometheus.Counter
+	EventsFlushed   prometheus.Counter
+	Relay           *relay.Relay
+	SampleErrors    prometheus.CounterVec
+	SamplesReceived prometheus.Counter
+	TagErrors       prometheus.Counter
+	TagsReceived    prometheus.Counter
+	UdpPacketQueue  chan []byte
+}
+
+func (l *StatsDUDPListener) SetEventHandler(eh event.EventHandler) {
+	l.EventHandler = eh
+}
+
+func (l *StatsDUDPListener) Listen() {
+	buf := make([]byte, 65535)
+	go l.ProcessUdpPacketQueue()
+	for {
+		n, _, err := l.Conn.ReadFromUDP(buf)
+		if err != nil {
+			// https://github.com/golang/go/issues/4373
+			// ignore net: errClosing error as it will occur during shutdown
+			if strings.HasSuffix(err.Error(), "use of closed network connection") {
+				return
+			}
+			level.Error(l.Logger).Log("error", err)
+			return
+		}
+
+		l.EnqueueUdpPacket(buf, n)
+	}
+}
+
+func (l *StatsDUDPListener) EnqueueUdpPacket(packet []byte, n int) {
+	l.UDPPackets.Inc()
+	packetCopy := make([]byte, n)
+	copy(packetCopy, packet)
+	select {
+	case l.UdpPacketQueue <- packetCopy:
+		// do nothing
+	default:
+		l.UDPPacketDrops.Inc()
+	}
+}
+
+func (l *StatsDUDPListener) ProcessUdpPacketQueue() {
+	for {
+		packet := <-l.UdpPacketQueue
+		l.HandlePacket(packet)
+	}
+}
+
+func (l *StatsDUDPListener) HandlePacket(packet []byte) {
+	lines := strings.Split(string(packet), "\n")
+	for _, line := range lines {
+		level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "udp", "line", line)
+		l.LinesReceived.Inc()
+		if l.Relay != nil && len(line) > 0 {
+			l.Relay.RelayLine(line)
+		}
+		l.EventHandler.Queue(l.LineParser.LineToEvents(line, l.SampleErrors, l.SamplesReceived, l.TagErrors, l.TagsReceived, l.Logger))
+	}
+}
+
+type StatsDTCPListener struct {
+	Conn            *net.TCPListener
+	EventHandler    event.EventHandler
+	Logger          log.Logger
+	LineParser      Parser
+	LinesReceived   prometheus.Counter
+	EventsFlushed   prometheus.Counter
+	Relay           *relay.Relay
+	SampleErrors    prometheus.CounterVec
+	SamplesReceived prometheus.Counter
+	TagErrors       prometheus.Counter
+	TagsReceived    prometheus.Counter
+	TCPConnections  prometheus.Counter
+	TCPErrors       prometheus.Counter
+	TCPLineTooLong  prometheus.Counter
+}
+
+func (l *StatsDTCPListener) SetEventHandler(eh event.EventHandler) {
+	l.EventHandler = eh
+}
+
+func (l *StatsDTCPListener) Listen() {
+	for {
+		c, err := l.Conn.AcceptTCP()
+		if err != nil {
+			// https://github.com/golang/go/issues/4373
+			// ignore net: errClosing error as it will occur during shutdown
+			if strings.HasSuffix(err.Error(), "use of closed network connection") {
+				return
+			}
+			level.Error(l.Logger).Log("msg", "AcceptTCP failed", "error", err)
+			os.Exit(1)
+		}
+		go l.HandleConn(c)
+	}
+}
+
+func (l *StatsDTCPListener) HandleConn(c *net.TCPConn) {
+	defer c.Close()
+
+	l.TCPConnections.Inc()
+
+	r := bufio.NewReader(c)
+	for {
+		line, isPrefix, err := r.ReadLine()
+		if err != nil {
+			if err != io.EOF {
+				l.TCPErrors.Inc()
+				level.Debug(l.Logger).Log("msg", "Read failed", "addr", c.RemoteAddr(), "error", err)
+			}
+			break
+		}
+		level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "tcp", "line", string(line))
+		if isPrefix {
+			l.TCPLineTooLong.Inc()
+			level.Debug(l.Logger).Log("msg", "Read failed: line too long", "addr", c.RemoteAddr())
+			break
+		}
+		l.LinesReceived.Inc()
+		if l.Relay != nil && len(line) > 0 {
+			l.Relay.RelayLine(string(line))
+		}
+		l.EventHandler.Queue(l.LineParser.LineToEvents(string(line), l.SampleErrors, l.SamplesReceived, l.TagErrors, l.TagsReceived, l.Logger))
+	}
+}
+
+type StatsDUnixgramListener struct {
+	Conn            *net.UnixConn
+	EventHandler    event.EventHandler
+	Logger          log.Logger
+	LineParser      Parser
+	UnixgramPackets prometheus.Counter
+	LinesReceived   prometheus.Counter
+	EventsFlushed   prometheus.Counter
+	Relay           *relay.Relay
+	SampleErrors    prometheus.CounterVec
+	SamplesReceived prometheus.Counter
+	TagErrors       prometheus.Counter
+	TagsReceived    prometheus.Counter
+}
+
+func (l *StatsDUnixgramListener) SetEventHandler(eh event.EventHandler) {
+	l.EventHandler = eh
+}
+
+func (l *StatsDUnixgramListener) Listen() {
+	buf := make([]byte, 65535)
+	for {
+		n, _, err := l.Conn.ReadFromUnix(buf)
+		if err != nil {
+			// https://github.com/golang/go/issues/4373
+			// ignore net: errClosing error as it will occur during shutdown
+			if strings.HasSuffix(err.Error(), "use of closed network connection") {
+				return
+			}
+			level.Error(l.Logger).Log(err)
+			os.Exit(1)
+		}
+		l.HandlePacket(buf[:n])
+	}
+}
+
+func (l *StatsDUnixgramListener) HandlePacket(packet []byte) {
+	l.UnixgramPackets.Inc()
+	lines := strings.Split(string(packet), "\n")
+	for _, line := range lines {
+		level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "unixgram", "line", line)
+		l.LinesReceived.Inc()
+		if l.Relay != nil && len(line) > 0 {
+			l.Relay.RelayLine(line)
+		}
+		l.EventHandler.Queue(l.LineParser.LineToEvents(line, l.SampleErrors, l.SamplesReceived, l.TagErrors, l.TagsReceived, l.Logger))
+	}
+}

pkg/mapper/escape.go

@@ -0,0 +1,86 @@
+// Copyright 2020 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mapper
+
+import (
+	"strings"
+	"unicode/utf8"
+)
+
+// EscapeMetricName replaces invalid characters in the metric name with "_"
+// Valid characters are a-z, A-Z, 0-9, and _
+func EscapeMetricName(metricName string) string {
+	metricLen := len(metricName)
+	if metricLen == 0 {
+		return ""
+	}
+
+	escaped := false
+	var sb strings.Builder
+	// If a metric starts with a digit, allocate the memory and prepend an
+	// underscore.
+	if metricName[0] >= '0' && metricName[0] <= '9' {
+		escaped = true
+		sb.Grow(metricLen + 1)
+		sb.WriteByte('_')
+	}
+
+	// This is an character replacement method optimized for this limited
+	// use case.  It is much faster than using a regex.
+	offset := 0
+
+	var prevChar rune
+
+	for i, c := range metricName {
+		// Seek forward, skipping valid characters until we find one that needs
+		// to be replaced, then add all the characters we've seen so far to the
+		// string.Builder.
+		if (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
+			(c >= '0' && c <= '9') || (c == '_') {
+			// Character is valid, so skip over it without doing anything.
+		} else {
+			// Double-dashes are allowed if there is a corresponding mapping.
+			// For consistency, double-dashes should also be allowed in the default case.
+			if c == '-' && prevChar == '-' {
+				offset = i + utf8.RuneLen(c)
+				continue
+			}
+
+			if !escaped {
+				// Up until now we've been lazy and avoided actually allocating
+				// memory.  Unfortunately we've now determined this string needs
+				// escaping, so allocate the buffer for the whole string.
+				escaped = true
+				sb.Grow(metricLen)
+			}
+			sb.WriteString(metricName[offset:i])
+			offset = i + utf8.RuneLen(c)
+			sb.WriteByte('_')
+		}
+
+		prevChar = c
+	}
+
+	if !escaped {
+		// This is the happy path where nothing had to be escaped, so we can
+		// avoid doing anything.
+		return metricName
+	}
+
+	if offset < metricLen {
+		sb.WriteString(metricName[offset:])
+	}
+
+	return sb.String()
+}

pkg/mapper/escape_test.go

@@ -0,0 +1,60 @@
+// Copyright 2020 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mapper
+
+import "testing"
+
+func TestEscapeMetricName(t *testing.T) {
+	scenarios := map[string]string{
+		"clean":                   "clean",
+		"0starts_with_digit":      "_0starts_with_digit",
+		"with_underscore":         "with_underscore",
+		"with--doubledash":        "with_doubledash",
+		"with---multiple-dashes":  "with_multiple_dashes",
+		"with.dot":                "with_dot",
+		"with😱emoji":              "with_emoji",
+		"with.*.multiple":         "with___multiple",
+		"test.web-server.foo.bar": "test_web_server_foo_bar",
+		"":                        "",
+	}
+
+	for in, want := range scenarios {
+		if got := EscapeMetricName(in); want != got {
+			t.Errorf("expected `%s` to be escaped to `%s`, got `%s`", in, want, got)
+		}
+	}
+}
+
+func BenchmarkEscapeMetricName(b *testing.B) {
+	scenarios := []string{
+		"clean",
+		"0starts_with_digit",
+		"with_underscore",
+		"with--doubledash",
+		"with---multiple-dashes",
+		"with.dot",
+		"with😱emoji",
+		"with.*.multiple",
+		"test.web-server.foo.bar",
+		"",
+	}
+
+	for _, s := range scenarios {
+		b.Run(s, func(b *testing.B) {
+			for n := 0; n < b.N; n++ {
+				EscapeMetricName(s)
+			}
+		})
+	}
+}

pkg/mapper/fsm/README.md

@@ -40,7 +40,7 @@ At first, the FSM only contains three states, representing three possible metric
           /
     (start)---- [counter]
           \
-           '--- [ timer ]
+           '--- [observer]
 
 
 Adding a rule `client.*.request.count` with type `counter` will make the FSM to be:
@@ -50,7 +50,7 @@ Adding a rule `client.*.request.count` with type `counter` will make the FSM to
           /
     (start)---- [counter] -- [client] -- [*] -- [request] -- [count] -- {R1}
           \
-           '--- [timer]
+           '--- [observer]
 
 `{R1}` is short for result 1, which is the match result for `client.*.request.count`.
 
@@ -60,7 +60,7 @@ Adding a rule `client.*.*.size` with type `counter` will make the FSM to be:
           /                                 /
     (start)---- [counter] -- [client] -- [*]
           \                                  \__ [*] -- [size] -- {R2}
-           '--- [timer]
+           '--- [observer]
 
 
 ### Finding a result state in FSM
@@ -76,7 +76,7 @@ FSM, the `^1` to `^7` symbols indicate how FSM will traversal in its tree:
           /                                 /       ^5        ^6         ^7
     (start)---- [counter] -- [client] -- [*]
        ^1 \          ^2           ^3        \__ [*] -- [size] -- {R2}
-           '--- [timer]                   ^4 
+           '--- [observer]                ^4 
 
 
 To map `client.bbb.request.size`, FSM will do a backtracking:
@@ -86,7 +86,7 @@ To map `client.bbb.request.size`, FSM will do a backtracking:
           /                                 /       ^5         ^6
     (start)---- [counter] -- [client] -- [*]
        ^1 \          ^2           ^3        \__ [*] -- [size] -- {R2}
-           '--- [timer]                   ^4
+           '--- [observer]                ^4
                                                  ^7      ^8        ^9
 
 

pkg/mapper/fsm/dump.go

@@ -43,6 +43,6 @@ func (f *FSM) DumpFSM(w io.Writer) {
 		idx++
 	}
 	// color for start state
-	w.Write([]byte(fmt.Sprintf("0 [color=\"#a94442\",fillcolor=\"#f2dede\"];\n")))
+	w.Write([]byte(fmt.Sprintln("0 [color=\"#a94442\",fillcolor=\"#f2dede\"];")))
 	w.Write([]byte("}"))
 }

pkg/mapper/fsm/fsm.go

@@ -17,7 +17,9 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/prometheus/common/log"
+	"github.com/go-kit/log"
+
+	"github.com/prometheus/statsd_exporter/pkg/level"
 )
 
 type mappingState struct {
@@ -232,7 +234,7 @@ func (f *FSM) GetMapping(statsdMetric string, statsdMetricType string) (*mapping
 
 // TestIfNeedBacktracking tests if backtrack is needed for given list of mappings
 // and whether ordering is disabled.
-func TestIfNeedBacktracking(mappings []string, orderingDisabled bool) bool {
+func TestIfNeedBacktracking(mappings []string, orderingDisabled bool, logger log.Logger) bool {
 	backtrackingNeeded := false
 	// A has * in rules, but there's other transisitions at the same state,
 	// this makes A the cause of backtracking
@@ -248,7 +250,7 @@ func TestIfNeedBacktracking(mappings []string, orderingDisabled bool) bool {
 		metricRe = strings.Replace(metricRe, "*", "([^.]*)", -1)
 		regex, err := regexp.Compile("^" + metricRe + "$")
 		if err != nil {
-			log.Warnf("invalid match %s. cannot compile regex in mapping: %v", mapping, err)
+			level.Warn(logger).Log("msg", "Invalid match, cannot compile regex in mapping", "mapping", mapping, "err", err)
 		}
 		// put into array no matter there's error or not, we will skip later if regex is nil
 		ruleREByLength[l] = append(ruleREByLength[l], regex)
@@ -291,8 +293,7 @@ func TestIfNeedBacktracking(mappings []string, orderingDisabled bool) bool {
 				if i2 != i1 && len(re1.FindStringSubmatchIndex(r2)) > 0 {
 					// log if we care about ordering and the superset occurs before
 					if !orderingDisabled && i1 < i2 {
-						log.Warnf("match \"%s\" is a super set of match \"%s\" but in a lower order, "+
-							"the first will never be matched", r1, r2)
+						level.Warn(logger).Log("msg", "match is a super set of match but in a lower order, the first will never be matched", "first_match", r1, "second_match", r2)
 					}
 					currentRuleNeedBacktrack = false
 				}
@@ -310,8 +311,7 @@ func TestIfNeedBacktracking(mappings []string, orderingDisabled bool) bool {
 			}
 
 			if currentRuleNeedBacktrack {
-				log.Warnf("backtracking required because of match \"%s\", "+
-					"matching performance may be degraded", r1)
+				level.Warn(logger).Log("msg", "backtracking required because of match. Performance may be degraded", "match", r1)
 				backtrackingNeeded = true
 			}
 		}

pkg/mapper/mapper.go

@@ -15,69 +15,66 @@ package mapper
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"regexp"
 	"sync"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
-	yaml "gopkg.in/yaml.v2"
 	"time"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+	"gopkg.in/yaml.v2"
+
+	"github.com/prometheus/statsd_exporter/pkg/level"
+	"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
 )
 
 var (
-	statsdMetricRE    = `[a-zA-Z_](-?[a-zA-Z0-9_])+`
-	templateReplaceRE = `(\$\{?\d+\}?)`
+	// The first segment of a match cannot start with a number
+	statsdMetricRE = `[a-zA-Z_]([a-zA-Z0-9_\-])*`
+	// The subsequent segments of a match can start with a number
+	// See https://github.com/prometheus/statsd_exporter/issues/328
+	statsdMetricSubsequentRE = `[a-zA-Z0-9_]([a-zA-Z0-9_\-])*`
+	templateReplaceRE        = `(\$\{?\d+\}?)`
 
-	metricLineRE = regexp.MustCompile(`^(\*\.|` + statsdMetricRE + `\.)+(\*|` + statsdMetricRE + `)$`)
+	metricLineRE = regexp.MustCompile(`^(\*|` + statsdMetricRE + `)(\.\*|\.` + statsdMetricSubsequentRE + `)*$`)
 	metricNameRE = regexp.MustCompile(`^([a-zA-Z_]|` + templateReplaceRE + `)([a-zA-Z0-9_]|` + templateReplaceRE + `)*$`)
 	labelNameRE  = regexp.MustCompile(`^[a-zA-Z_][a-zA-Z0-9_]+$`)
 )
 
-type mapperConfigDefaults struct {
-	TimerType           TimerType         `yaml:"timer_type"`
-	Buckets             []float64         `yaml:"buckets"`
-	Quantiles           []metricObjective `yaml:"quantiles"`
-	MatchType           MatchType         `yaml:"match_type"`
-	GlobDisableOrdering bool              `yaml:"glob_disable_ordering"`
-	Ttl                 time.Duration     `yaml:"ttl"`
-}
-
 type MetricMapper struct {
-	Defaults mapperConfigDefaults `yaml:"defaults"`
-	Mappings []MetricMapping      `yaml:"mappings"`
-	FSM      *fsm.FSM
-	doFSM    bool
-	doRegex  bool
-	mutex    sync.Mutex
+	Registerer prometheus.Registerer
+	Defaults   MapperConfigDefaults `yaml:"defaults"`
+	Mappings   []MetricMapping      `yaml:"mappings"`
+	FSM        *fsm.FSM
+	doFSM      bool
+	doRegex    bool
+	cache      MetricMapperCache
+	mutex      sync.RWMutex
 
 	MappingsCount prometheus.Gauge
+
+	Logger log.Logger
 }
 
-type MetricMapping struct {
-	Match           string `yaml:"match"`
-	Name            string `yaml:"name"`
-	nameFormatter   *fsm.TemplateFormatter
-	regex           *regexp.Regexp
-	Labels          prometheus.Labels `yaml:"labels"`
-	labelKeys       []string
-	labelFormatters []*fsm.TemplateFormatter
-	TimerType       TimerType         `yaml:"timer_type"`
-	Buckets         []float64         `yaml:"buckets"`
-	Quantiles       []metricObjective `yaml:"quantiles"`
-	MatchType       MatchType         `yaml:"match_type"`
-	HelpText        string            `yaml:"help"`
-	Action          ActionType        `yaml:"action"`
-	MatchMetricType MetricType        `yaml:"match_metric_type"`
-	Ttl             time.Duration     `yaml:"ttl"`
+type SummaryOptions struct {
+	Quantiles  []MetricObjective `yaml:"quantiles"`
+	MaxAge     time.Duration     `yaml:"max_age"`
+	AgeBuckets uint32            `yaml:"age_buckets"`
+	BufCap     uint32            `yaml:"buf_cap"`
 }
 
-type metricObjective struct {
+type HistogramOptions struct {
+	Buckets                     []float64 `yaml:"buckets"`
+	NativeHistogramBucketFactor float64   `yaml:"native_histogram_bucket_factor"`
+	NativeHistogramMaxBuckets   uint32    `yaml:"native_histogram_max_buckets"`
+}
+
+type MetricObjective struct {
 	Quantile float64 `yaml:"quantile"`
 	Error    float64 `yaml:"error"`
 }
 
-var defaultQuantiles = []metricObjective{
+var defaultQuantiles = []MetricObjective{
 	{Quantile: 0.5, Error: 0.05},
 	{Quantile: 0.9, Error: 0.01},
 	{Quantile: 0.99, Error: 0.001},
@@ -90,12 +87,18 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 		return err
 	}
 
-	if n.Defaults.Buckets == nil || len(n.Defaults.Buckets) == 0 {
-		n.Defaults.Buckets = prometheus.DefBuckets
+	if len(n.Defaults.HistogramOptions.Buckets) == 0 {
+		n.Defaults.HistogramOptions.Buckets = prometheus.DefBuckets
+	}
+	if n.Defaults.HistogramOptions.NativeHistogramBucketFactor == 0 {
+		n.Defaults.HistogramOptions.NativeHistogramBucketFactor = 1.1
+	}
+	if n.Defaults.HistogramOptions.NativeHistogramMaxBuckets <= 0 {
+		n.Defaults.HistogramOptions.NativeHistogramMaxBuckets = 256
 	}
 
-	if n.Defaults.Quantiles == nil || len(n.Defaults.Quantiles) == 0 {
-		n.Defaults.Quantiles = defaultQuantiles
+	if len(n.Defaults.SummaryOptions.Quantiles) == 0 {
+		n.Defaults.SummaryOptions.Quantiles = defaultQuantiles
 	}
 
 	if n.Defaults.MatchType == MatchTypeDefault {
@@ -104,7 +107,7 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 
 	remainingMappingsCount := len(n.Mappings)
 
-	n.FSM = fsm.NewFSM([]string{string(MetricTypeCounter), string(MetricTypeGauge), string(MetricTypeTimer)},
+	n.FSM = fsm.NewFSM([]string{string(MetricTypeCounter), string(MetricTypeGauge), string(MetricTypeObserver)},
 		remainingMappingsCount, n.Defaults.GlobDisableOrdering)
 
 	for i := range n.Mappings {
@@ -156,7 +159,6 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 			}
 			currentMapping.labelFormatters = labelFormatters
 			currentMapping.labelKeys = labelKeys
-
 		} else {
 			if regex, err := regexp.Compile(currentMapping.Match); err != nil {
 				return fmt.Errorf("invalid regex %s in mapping: %v", currentMapping.Match, err)
@@ -166,29 +168,91 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 			n.doRegex = true
 		}
 
-		if currentMapping.TimerType == "" {
-			currentMapping.TimerType = n.Defaults.TimerType
+		if currentMapping.ObserverType == "" {
+			currentMapping.ObserverType = n.Defaults.ObserverType
 		}
 
-		if currentMapping.Buckets == nil || len(currentMapping.Buckets) == 0 {
-			currentMapping.Buckets = n.Defaults.Buckets
+		if currentMapping.LegacyQuantiles != nil &&
+			(currentMapping.SummaryOptions == nil || currentMapping.SummaryOptions.Quantiles != nil) {
+			level.Warn(m.Logger).Log("msg", "using the top level quantiles is deprecated.  Please use quantiles in the summary_options hierarchy")
 		}
 
-		if currentMapping.Quantiles == nil || len(currentMapping.Quantiles) == 0 {
-			currentMapping.Quantiles = n.Defaults.Quantiles
+		if currentMapping.LegacyBuckets != nil &&
+			(currentMapping.HistogramOptions == nil || currentMapping.HistogramOptions.Buckets != nil) {
+			level.Warn(m.Logger).Log("msg", "using the top level buckets is deprecated.  Please use buckets in the histogram_options hierarchy")
+		}
+
+		if currentMapping.SummaryOptions != nil &&
+			currentMapping.LegacyQuantiles != nil &&
+			currentMapping.SummaryOptions.Quantiles != nil {
+			return fmt.Errorf("cannot use quantiles in both the top level and summary options at the same time in %s", currentMapping.Match)
+		}
+
+		if currentMapping.HistogramOptions != nil &&
+			currentMapping.LegacyBuckets != nil &&
+			currentMapping.HistogramOptions.Buckets != nil {
+			return fmt.Errorf("cannot use buckets in both the top level and histogram options at the same time in %s", currentMapping.Match)
+		}
+
+		if currentMapping.ObserverType == ObserverTypeHistogram {
+			if currentMapping.SummaryOptions != nil {
+				return fmt.Errorf("cannot use histogram observer and summary options at the same time")
+			}
+			if currentMapping.HistogramOptions == nil {
+				currentMapping.HistogramOptions = &HistogramOptions{}
+			}
+			if currentMapping.LegacyBuckets != nil && len(currentMapping.LegacyBuckets) != 0 {
+				currentMapping.HistogramOptions.Buckets = currentMapping.LegacyBuckets
+			}
+			if currentMapping.HistogramOptions.Buckets == nil || len(currentMapping.HistogramOptions.Buckets) == 0 {
+				currentMapping.HistogramOptions.Buckets = n.Defaults.HistogramOptions.Buckets
+			}
+		}
+
+		if currentMapping.ObserverType == ObserverTypeSummary {
+			if currentMapping.HistogramOptions != nil {
+				return fmt.Errorf("cannot use summary observer and histogram options at the same time")
+			}
+			if currentMapping.SummaryOptions == nil {
+				currentMapping.SummaryOptions = &SummaryOptions{}
+			}
+			if currentMapping.LegacyQuantiles != nil && len(currentMapping.LegacyQuantiles) != 0 {
+				currentMapping.SummaryOptions.Quantiles = currentMapping.LegacyQuantiles
+			}
+			if currentMapping.SummaryOptions.Quantiles == nil || len(currentMapping.SummaryOptions.Quantiles) == 0 {
+				currentMapping.SummaryOptions.Quantiles = n.Defaults.SummaryOptions.Quantiles
+			}
+			if currentMapping.SummaryOptions.MaxAge == 0 {
+				currentMapping.SummaryOptions.MaxAge = n.Defaults.SummaryOptions.MaxAge
+			}
+			if currentMapping.SummaryOptions.AgeBuckets == 0 {
+				currentMapping.SummaryOptions.AgeBuckets = n.Defaults.SummaryOptions.AgeBuckets
+			}
+			if currentMapping.SummaryOptions.BufCap == 0 {
+				currentMapping.SummaryOptions.BufCap = n.Defaults.SummaryOptions.BufCap
+			}
 		}
 
 		if currentMapping.Ttl == 0 && n.Defaults.Ttl > 0 {
 			currentMapping.Ttl = n.Defaults.Ttl
 		}
-
 	}
 
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
+	if m.Logger == nil {
+		m.Logger = log.NewNopLogger()
+	}
+
 	m.Defaults = n.Defaults
 	m.Mappings = n.Mappings
+
+	// Reset the cache since this function can be used to reload config
+	if m.cache != nil {
+		m.cache.Reset()
+	}
+
 	if n.doFSM {
 		var mappings []string
 		for _, mapping := range n.Mappings {
@@ -196,7 +260,7 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 				mappings = append(mappings, mapping.Match)
 			}
 		}
-		n.FSM.BacktrackingNeeded = fsm.TestIfNeedBacktracking(mappings, n.FSM.OrderingDisabled)
+		n.FSM.BacktrackingNeeded = fsm.TestIfNeedBacktracking(mappings, n.FSM.OrderingDisabled, m.Logger)
 
 		m.FSM = n.FSM
 		m.doRegex = n.doRegex
@@ -211,36 +275,70 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 }
 
 func (m *MetricMapper) InitFromFile(fileName string) error {
-	mappingStr, err := ioutil.ReadFile(fileName)
+	mappingStr, err := os.ReadFile(fileName)
 	if err != nil {
 		return err
 	}
+
 	return m.InitFromYAMLString(string(mappingStr))
 }
 
+// UseCache tells the mapper to use a cache that implements the MetricMapperCache interface.
+// This cache MUST be thread-safe!
+func (m *MetricMapper) UseCache(cache MetricMapperCache) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	m.cache = cache
+}
+
 func (m *MetricMapper) GetMapping(statsdMetric string, statsdMetricType MetricType) (*MetricMapping, prometheus.Labels, bool) {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	// only use a cache if one is present
+	if m.cache != nil {
+		result, cached := m.cache.Get(formatKey(statsdMetric, statsdMetricType))
+		if cached {
+			r := result.(MetricMapperCacheResult)
+			return r.Mapping, r.Labels, r.Matched
+		}
+	}
+
 	// glob matching
 	if m.doFSM {
 		finalState, captures := m.FSM.GetMapping(statsdMetric, string(statsdMetricType))
 		if finalState != nil && finalState.Result != nil {
-			result := finalState.Result.(*MetricMapping)
+			v := finalState.Result.(*MetricMapping)
+			result := copyMetricMapping(v)
 			result.Name = result.nameFormatter.Format(captures)
 
 			labels := prometheus.Labels{}
 			for index, formatter := range result.labelFormatters {
 				labels[result.labelKeys[index]] = formatter.Format(captures)
 			}
+
+			r := MetricMapperCacheResult{
+				Mapping: result,
+				Matched: true,
+				Labels:  labels,
+			}
+			// add match to cache
+			if m.cache != nil {
+				m.cache.Add(formatKey(statsdMetric, statsdMetricType), r)
+			}
+
 			return result, labels, true
 		} else if !m.doRegex {
 			// if there's no regex match type, return immediately
+			// Add miss to cache
+			if m.cache != nil {
+				m.cache.Add(formatKey(statsdMetric, statsdMetricType), MetricMapperCacheResult{})
+			}
 			return nil, nil, false
 		}
 	}
 
 	// regex matching
-	m.mutex.Lock()
-	defer m.mutex.Unlock()
-
 	for _, mapping := range m.Mappings {
 		// if a rule don't have regex matching type, the regex field is unset
 		if mapping.regex == nil {
@@ -268,8 +366,29 @@ func (m *MetricMapper) GetMapping(statsdMetric string, statsdMetricType MetricTy
 			labels[label] = string(value)
 		}
 
+		r := MetricMapperCacheResult{
+			Mapping: &mapping,
+			Matched: true,
+			Labels:  labels,
+		}
+		// Add Match to cache
+		if m.cache != nil {
+			m.cache.Add(formatKey(statsdMetric, statsdMetricType), r)
+		}
+
 		return &mapping, labels, true
 	}
 
+	// Add Miss to cache
+	if m.cache != nil {
+		m.cache.Add(formatKey(statsdMetric, statsdMetricType), MetricMapperCacheResult{})
+	}
 	return nil, nil, false
 }
+
+// make a shallow copy so that we do not overwrite name
+// as multiple names can be matched by same mapping
+func copyMetricMapping(in *MetricMapping) *MetricMapping {
+	out := *in
+	return &out
+}

pkg/mapper/mapper_benchmark_test.go

@@ -15,7 +15,13 @@ package mapper
 
 import (
 	"fmt"
+	"math/rand"
 	"testing"
+
+	"github.com/go-kit/log"
+
+	"github.com/prometheus/statsd_exporter/pkg/mappercache/lru"
+	"github.com/prometheus/statsd_exporter/pkg/mappercache/randomreplacement"
 )
 
 var (
@@ -238,7 +244,9 @@ mappings:
 		"foo.bar.baz",
 	}
 
-	mapper := MetricMapper{}
+	mapper := MetricMapper{
+		Logger: log.NewNopLogger(),
+	}
 	err := mapper.InitFromYAMLString(config)
 	if err != nil {
 		b.Fatalf("Config load error: %s %s", config, err)
@@ -573,6 +581,32 @@ mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
 	}
 }
 
+func BenchmarkGlob10RulesCached(b *testing.B) {
+	config := `---
+mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
+	mappings := []string{
+		"metric100.a",
+	}
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := newTestMapperWithCache(cacheType, 1000)
+
+		b.Run(cacheType, func(b *testing.B) {
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}
+
 func BenchmarkRegex10RulesAverage(b *testing.B) {
 	config := `---
 defaults:
@@ -596,6 +630,43 @@ mappings:` + duplicateRules(10, ruleTemplateSingleMatchRegex)
 	}
 }
 
+func BenchmarkRegex10RulesAverageCached(b *testing.B) {
+	config := `---
+defaults:
+  match_type: regex
+mappings:` + duplicateRules(10, ruleTemplateSingleMatchRegex)
+	mappings := []string{
+		"metric5.a",
+	}
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := MetricMapper{}
+		var cache MetricMapperCache
+		switch cacheType {
+		case "lru":
+			cache, _ = lru.NewMetricMapperLRUCache(mapper.Registerer, 1000)
+		case "random":
+			cache, _ = randomreplacement.NewMetricMapperRRCache(mapper.Registerer, 1000)
+		}
+		mapper.UseCache(cache)
+
+		b.Run(cacheType, func(b *testing.B) {
+			mapper := MetricMapper{}
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}
+
 func BenchmarkGlob100Rules(b *testing.B) {
 	config := `---
 mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
@@ -617,6 +688,32 @@ mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
 	}
 }
 
+func BenchmarkGlob100RulesCached(b *testing.B) {
+	config := `---
+mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
+	mappings := []string{
+		"metric100.a",
+	}
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := newTestMapperWithCache(cacheType, 1000)
+
+		b.Run(cacheType, func(b *testing.B) {
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}
+
 func BenchmarkGlob100RulesNoMatch(b *testing.B) {
 	config := `---
 mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
@@ -728,6 +825,32 @@ mappings:` + duplicateRules(100, ruleTemplateMultipleMatchGlob)
 	}
 }
 
+func BenchmarkGlob100RulesMultipleCapturesCached(b *testing.B) {
+	config := `---
+mappings:` + duplicateRules(100, ruleTemplateMultipleMatchGlob)
+	mappings := []string{
+		"metric50.a.b.c.d.e.f.g.h.i.j.k.l",
+	}
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := newTestMapperWithCache(cacheType, 1000)
+
+		b.Run(cacheType, func(b *testing.B) {
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}
+
 func BenchmarkRegex100RulesMultipleCapturesAverage(b *testing.B) {
 	config := `---
 defaults:
@@ -773,3 +896,128 @@ mappings:` + duplicateRules(100, ruleTemplateMultipleMatchRegex)
 		}
 	}
 }
+
+func BenchmarkRegex100RulesMultipleCapturesWorstCached(b *testing.B) {
+	config := `---
+defaults:
+  match_type: regex
+mappings:` + duplicateRules(100, ruleTemplateMultipleMatchRegex)
+	mappings := []string{
+		"metric100.a.b.c.d.e.f.g.h.i.j.k.l",
+	}
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := newTestMapperWithCache(cacheType, 1000)
+
+		b.Run(cacheType, func(b *testing.B) {
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}
+
+func duplicateMetrics(count int, template string) []string {
+	var out []string
+	for i := 0; i < count; i++ {
+		out = append(out, fmt.Sprintf(template, i))
+	}
+	return out
+}
+
+func BenchmarkGlob100RulesCached100Metrics(b *testing.B) {
+	config := `---
+mappings:` + duplicateRules(101, ruleTemplateSingleMatchGlob)
+
+	mappings := duplicateMetrics(100, "metric100")
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := newTestMapperWithCache(cacheType, 1000)
+
+		b.Run(cacheType, func(b *testing.B) {
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}
+
+func BenchmarkGlob100RulesCached100MetricsSmallCache(b *testing.B) {
+	// This benchmark is the worst case for the LRU cache.
+	// The cache is smaller than the total number of metrics and
+	// we iterate linearly through the metrics, so we will
+	// constantly evict cache entries.
+	config := `---
+mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
+
+	mappings := duplicateMetrics(100, "metric100")
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := newTestMapperWithCache(cacheType, 1000)
+
+		b.Run(cacheType, func(b *testing.B) {
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}
+
+func BenchmarkGlob100RulesCached100MetricsRandomSmallCache(b *testing.B) {
+	// Slighly more realistic benchmark with a smaller cache.
+	// Randomly match metrics so we should have some cache hits.
+	config := `---
+mappings:` + duplicateRules(100, ruleTemplateSingleMatchGlob)
+
+	base := duplicateMetrics(100, "metric100")
+	var mappings []string
+	for i := 0; i < 10; i++ {
+		mappings = append(mappings, base...)
+	}
+
+	r := rand.New(rand.NewSource(42))
+	r.Shuffle(len(mappings), func(i, j int) {
+		mappings[i], mappings[j] = mappings[j], mappings[i]
+	})
+
+	for _, cacheType := range []string{"lru", "random"} {
+		mapper := newTestMapperWithCache(cacheType, 50)
+		b.Run(cacheType, func(b *testing.B) {
+			err := mapper.InitFromYAMLString(config)
+			if err != nil {
+				b.Fatalf("Config load error: %s %s", config, err)
+			}
+
+			b.ResetTimer()
+			for j := 0; j < b.N; j++ {
+				for _, metric := range mappings {
+					mapper.GetMapping(metric, MetricTypeCounter)
+				}
+			}
+		})
+	}
+}

pkg/mapper/mapper_cache.go

@@ -0,0 +1,74 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mapper
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type CacheMetrics struct {
+	CacheLength    prometheus.Gauge
+	CacheGetsTotal prometheus.Counter
+	CacheHitsTotal prometheus.Counter
+}
+
+func NewCacheMetrics(reg prometheus.Registerer) *CacheMetrics {
+	var m CacheMetrics
+
+	m.CacheLength = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "statsd_metric_mapper_cache_length",
+			Help: "The count of unique metrics currently cached.",
+		},
+	)
+	m.CacheGetsTotal = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_metric_mapper_cache_gets_total",
+			Help: "The count of total metric cache gets.",
+		},
+	)
+	m.CacheHitsTotal = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_metric_mapper_cache_hits_total",
+			Help: "The count of total metric cache hits.",
+		},
+	)
+
+	if reg != nil {
+		reg.MustRegister(m.CacheLength)
+		reg.MustRegister(m.CacheGetsTotal)
+		reg.MustRegister(m.CacheHitsTotal)
+	}
+	return &m
+}
+
+type MetricMapperCacheResult struct {
+	Mapping *MetricMapping
+	Matched bool
+	Labels  prometheus.Labels
+}
+
+// MetricMapperCache MUST be thread-safe and should be instrumented with CacheMetrics
+type MetricMapperCache interface {
+	// Get a cached result
+	Get(metricKey string) (interface{}, bool)
+	// Add a statsd MetricMapperResult to the cache
+	Add(metricKey string, result interface{}) // Add an item to the cache
+	// Reset clears the cache for config reloads
+	Reset()
+}
+
+func formatKey(metricString string, metricType MetricType) string {
+	return string(metricType) + "." + metricString
+}

pkg/mapper/mapper_defaults.go

@@ -0,0 +1,72 @@
+// Copyright 2020 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mapper
+
+import "time"
+
+type MapperConfigDefaults struct {
+	ObserverType        ObserverType     `yaml:"observer_type"`
+	MatchType           MatchType        `yaml:"match_type"`
+	GlobDisableOrdering bool             `yaml:"glob_disable_ordering"`
+	Ttl                 time.Duration    `yaml:"ttl"`
+	SummaryOptions      SummaryOptions   `yaml:"summary_options"`
+	HistogramOptions    HistogramOptions `yaml:"histogram_options"`
+}
+
+// mapperConfigDefaultsAlias is used to unmarshal the yaml config into mapperConfigDefaults and allows deprecated fields
+type mapperConfigDefaultsAlias struct {
+	ObserverType        ObserverType      `yaml:"observer_type"`
+	TimerType           ObserverType      `yaml:"timer_type,omitempty"` // DEPRECATED - field only present to preserve backwards compatibility in configs
+	Buckets             []float64         `yaml:"buckets"`              // DEPRECATED - field only present to preserve backwards compatibility in configs
+	Quantiles           []MetricObjective `yaml:"quantiles"`            // DEPRECATED - field only present to preserve backwards compatibility in configs
+	MatchType           MatchType         `yaml:"match_type"`
+	GlobDisableOrdering bool              `yaml:"glob_disable_ordering"`
+	Ttl                 time.Duration     `yaml:"ttl"`
+	SummaryOptions      SummaryOptions    `yaml:"summary_options"`
+	HistogramOptions    HistogramOptions  `yaml:"histogram_options"`
+}
+
+// UnmarshalYAML is a custom unmarshal function to allow use of deprecated config keys
+// observer_type will override timer_type
+func (d *MapperConfigDefaults) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var tmp mapperConfigDefaultsAlias
+	if err := unmarshal(&tmp); err != nil {
+		return err
+	}
+
+	// Copy defaults
+	d.ObserverType = tmp.ObserverType
+	d.MatchType = tmp.MatchType
+	d.GlobDisableOrdering = tmp.GlobDisableOrdering
+	d.Ttl = tmp.Ttl
+	d.SummaryOptions = tmp.SummaryOptions
+	d.HistogramOptions = tmp.HistogramOptions
+
+	// Use deprecated TimerType if necessary
+	if tmp.ObserverType == "" {
+		d.ObserverType = tmp.TimerType
+	}
+
+	// Use deprecated quantiles if necessary
+	if len(tmp.SummaryOptions.Quantiles) == 0 && len(tmp.Quantiles) > 0 {
+		d.SummaryOptions = SummaryOptions{Quantiles: tmp.Quantiles}
+	}
+
+	// Use deprecated buckets if necessary
+	if len(tmp.HistogramOptions.Buckets) == 0 && len(tmp.Buckets) > 0 {
+		d.HistogramOptions = HistogramOptions{Buckets: tmp.Buckets}
+	}
+
+	return nil
+}

pkg/mapper/mapping.go

@@ -0,0 +1,102 @@
+// Copyright 2020 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either xpress or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mapper
+
+import (
+	"regexp"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
+)
+
+type MetricMapping struct {
+	Match            string `yaml:"match"`
+	Name             string `yaml:"name"`
+	nameFormatter    *fsm.TemplateFormatter
+	regex            *regexp.Regexp
+	Labels           prometheus.Labels `yaml:"labels"`
+	HonorLabels      bool              `yaml:"honor_labels"`
+	labelKeys        []string
+	labelFormatters  []*fsm.TemplateFormatter
+	ObserverType     ObserverType      `yaml:"observer_type"`
+	TimerType        ObserverType      `yaml:"timer_type,omitempty"` // DEPRECATED - field only present to preserve backwards compatibility in configs. Always empty
+	LegacyBuckets    []float64         `yaml:"buckets"`
+	LegacyQuantiles  []MetricObjective `yaml:"quantiles"`
+	MatchType        MatchType         `yaml:"match_type"`
+	HelpText         string            `yaml:"help"`
+	Action           ActionType        `yaml:"action"`
+	MatchMetricType  MetricType        `yaml:"match_metric_type"`
+	Ttl              time.Duration     `yaml:"ttl"`
+	SummaryOptions   *SummaryOptions   `yaml:"summary_options"`
+	HistogramOptions *HistogramOptions `yaml:"histogram_options"`
+	Scale            MaybeFloat64      `yaml:"scale"`
+}
+
+// UnmarshalYAML is a custom unmarshal function to allow use of deprecated config keys
+// observer_type will override timer_type
+func (m *MetricMapping) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type MetricMappingAlias MetricMapping
+	var tmp MetricMappingAlias
+	if err := unmarshal(&tmp); err != nil {
+		return err
+	}
+
+	// Copy defaults
+	m.Match = tmp.Match
+	m.Name = tmp.Name
+	m.Labels = tmp.Labels
+	m.HonorLabels = tmp.HonorLabels
+	m.ObserverType = tmp.ObserverType
+	m.LegacyBuckets = tmp.LegacyBuckets
+	m.LegacyQuantiles = tmp.LegacyQuantiles
+	m.MatchType = tmp.MatchType
+	m.HelpText = tmp.HelpText
+	m.Action = tmp.Action
+	m.MatchMetricType = tmp.MatchMetricType
+	m.Ttl = tmp.Ttl
+	m.SummaryOptions = tmp.SummaryOptions
+	m.HistogramOptions = tmp.HistogramOptions
+	m.Scale = tmp.Scale
+
+	// Use deprecated TimerType if necessary
+	if tmp.ObserverType == "" {
+		m.ObserverType = tmp.TimerType
+	}
+
+	return nil
+}
+
+type MaybeFloat64 struct {
+	Set bool
+	Val float64
+}
+
+func (m *MaybeFloat64) MarshalYAML() (interface{}, error) {
+	if m.Set {
+		return m.Val, nil
+	}
+	return nil, nil
+}
+
+func (m *MaybeFloat64) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var tmp float64
+	if err := unmarshal(&tmp); err != nil {
+		return err
+	}
+	m.Val = tmp
+	m.Set = true
+	return nil
+}

pkg/mapper/metric_type.go

@@ -18,9 +18,10 @@ import "fmt"
 type MetricType string
 
 const (
-	MetricTypeCounter MetricType = "counter"
-	MetricTypeGauge   MetricType = "gauge"
-	MetricTypeTimer   MetricType = "timer"
+	MetricTypeCounter  MetricType = "counter"
+	MetricTypeGauge    MetricType = "gauge"
+	MetricTypeObserver MetricType = "observer"
+	MetricTypeTimer    MetricType = "timer" // DEPRECATED
 )
 
 func (m *MetricType) UnmarshalYAML(unmarshal func(interface{}) error) error {
@@ -34,8 +35,10 @@ func (m *MetricType) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		*m = MetricTypeCounter
 	case MetricTypeGauge:
 		*m = MetricTypeGauge
+	case MetricTypeObserver:
+		*m = MetricTypeObserver
 	case MetricTypeTimer:
-		*m = MetricTypeTimer
+		*m = MetricTypeObserver
 	default:
 		return fmt.Errorf("invalid metric type '%s'", v)
 	}

pkg/mapper/observer.go

@@ -15,27 +15,27 @@ package mapper
 
 import "fmt"
 
-type TimerType string
+type ObserverType string
 
 const (
-	TimerTypeHistogram TimerType = "histogram"
-	TimerTypeSummary   TimerType = "summary"
-	TimerTypeDefault   TimerType = ""
+	ObserverTypeHistogram ObserverType = "histogram"
+	ObserverTypeSummary   ObserverType = "summary"
+	ObserverTypeDefault   ObserverType = ""
 )
 
-func (t *TimerType) UnmarshalYAML(unmarshal func(interface{}) error) error {
+func (t *ObserverType) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	var v string
 	if err := unmarshal(&v); err != nil {
 		return err
 	}
 
-	switch TimerType(v) {
-	case TimerTypeHistogram:
-		*t = TimerTypeHistogram
-	case TimerTypeSummary, TimerTypeDefault:
-		*t = TimerTypeSummary
+	switch ObserverType(v) {
+	case ObserverTypeHistogram:
+		*t = ObserverTypeHistogram
+	case ObserverTypeSummary, ObserverTypeDefault:
+		*t = ObserverTypeSummary
 	default:
-		return fmt.Errorf("invalid timer type '%s'", v)
+		return fmt.Errorf("invalid observer type '%s'", v)
 	}
 	return nil
 }

pkg/mappercache/lru/lru.go

@@ -0,0 +1,103 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package lru
+
+import (
+	"sync"
+
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/golang/groupcache/lru"
+
+	"github.com/prometheus/statsd_exporter/pkg/mappercache"
+)
+
+type metricMapperLRUCache struct {
+	cache   *lruCache
+	metrics *mappercache.CacheMetrics
+}
+
+func NewMetricMapperLRUCache(reg prometheus.Registerer, size int) (*metricMapperLRUCache, error) {
+	if size <= 0 {
+		return nil, nil
+	}
+
+	metrics := mappercache.NewCacheMetrics(reg)
+	cache := newLruCache(size)
+
+	return &metricMapperLRUCache{metrics: metrics, cache: cache}, nil
+}
+
+func (m *metricMapperLRUCache) Get(metricKey string) (interface{}, bool) {
+	m.metrics.CacheGetsTotal.Inc()
+	if result, ok := m.cache.Get(metricKey); ok {
+		m.metrics.CacheHitsTotal.Inc()
+		return result, true
+	} else {
+		return nil, false
+	}
+}
+
+func (m *metricMapperLRUCache) Add(metricKey string, result interface{}) {
+	go m.trackCacheLength()
+	m.cache.Add(metricKey, result)
+}
+
+func (m *metricMapperLRUCache) trackCacheLength() {
+	m.metrics.CacheLength.Set(float64(m.cache.Len()))
+}
+
+func (m *metricMapperLRUCache) Reset() {
+	m.cache.Clear()
+	m.metrics.CacheLength.Set(0)
+}
+
+type lruCache struct {
+	cache *lru.Cache
+	lock  sync.RWMutex
+}
+
+func newLruCache(maxEntries int) *lruCache {
+	return &lruCache{
+		cache: lru.New(maxEntries),
+	}
+}
+
+func (l *lruCache) Get(key string) (interface{}, bool) {
+	l.lock.RLock()
+	defer l.lock.RUnlock()
+
+	return l.cache.Get(key)
+}
+
+func (l *lruCache) Add(key string, value interface{}) {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	l.cache.Add(key, value)
+}
+
+func (l *lruCache) Len() int {
+	l.lock.RLock()
+	defer l.lock.RUnlock()
+
+	return l.cache.Len()
+}
+
+func (l *lruCache) Clear() {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	l.cache.Clear()
+}

pkg/mappercache/metrics.go

@@ -0,0 +1,52 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mappercache
+
+import "github.com/prometheus/client_golang/prometheus"
+
+type CacheMetrics struct {
+	CacheLength    prometheus.Gauge
+	CacheGetsTotal prometheus.Counter
+	CacheHitsTotal prometheus.Counter
+}
+
+func NewCacheMetrics(reg prometheus.Registerer) *CacheMetrics {
+	var m CacheMetrics
+
+	m.CacheLength = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "statsd_metric_mapper_cache_length",
+			Help: "The count of unique metrics currently cached.",
+		},
+	)
+	m.CacheGetsTotal = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_metric_mapper_cache_gets_total",
+			Help: "The count of total metric cache gets.",
+		},
+	)
+	m.CacheHitsTotal = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "statsd_metric_mapper_cache_hits_total",
+			Help: "The count of total metric cache hits.",
+		},
+	)
+
+	if reg != nil {
+		reg.MustRegister(m.CacheLength)
+		reg.MustRegister(m.CacheGetsTotal)
+		reg.MustRegister(m.CacheHitsTotal)
+	}
+	return &m
+}

pkg/mappercache/randomreplacement/randomreplacement.go

@@ -0,0 +1,83 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package randomreplacement
+
+import (
+	"sync"
+
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/prometheus/statsd_exporter/pkg/mappercache"
+)
+
+type metricMapperRRCache struct {
+	lock    sync.RWMutex
+	size    int
+	items   map[string]interface{}
+	metrics *mappercache.CacheMetrics
+}
+
+func NewMetricMapperRRCache(reg prometheus.Registerer, size int) (*metricMapperRRCache, error) {
+	if size <= 0 {
+		return nil, nil
+	}
+
+	metrics := mappercache.NewCacheMetrics(reg)
+	c := &metricMapperRRCache{
+		items:   make(map[string]interface{}, size+1),
+		size:    size,
+		metrics: metrics,
+	}
+	return c, nil
+}
+
+func (m *metricMapperRRCache) Get(metricKey string) (interface{}, bool) {
+	m.lock.RLock()
+	result, ok := m.items[metricKey]
+	m.lock.RUnlock()
+
+	return result, ok
+}
+
+func (m *metricMapperRRCache) Add(metricKey string, result interface{}) {
+	go m.trackCacheLength()
+
+	m.lock.Lock()
+
+	m.items[metricKey] = result
+
+	// evict an item if needed
+	if len(m.items) > m.size {
+		for k := range m.items {
+			delete(m.items, k)
+			break
+		}
+	}
+
+	m.lock.Unlock()
+}
+
+func (m *metricMapperRRCache) Reset() {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	m.items = make(map[string]interface{}, m.size+1)
+	m.metrics.CacheLength.Set(0)
+}
+
+func (m *metricMapperRRCache) trackCacheLength() {
+	m.lock.RLock()
+	length := len(m.items)
+	m.lock.RUnlock()
+	m.metrics.CacheLength.Set(float64(length))
+}

pkg/metrics/metrics.go

@@ -0,0 +1,67 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package metrics
+
+import (
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type MetricType int
+
+const (
+	CounterMetricType MetricType = iota
+	GaugeMetricType
+	SummaryMetricType
+	HistogramMetricType
+)
+
+type NameHash uint64
+
+type ValueHash uint64
+
+type LabelHash struct {
+	// This is a hash over the label names
+	Names NameHash
+	// This is a hash over the label names + label values
+	Values ValueHash
+}
+
+type MetricHolder interface{}
+
+type VectorHolder interface {
+	Delete(label prometheus.Labels) bool
+}
+
+type Vector struct {
+	Holder   VectorHolder
+	RefCount uint64
+}
+
+type Metric struct {
+	MetricType MetricType
+	// Vectors key is the hash of the label names
+	Vectors map[NameHash]*Vector
+	// Metrics key is a hash of the label names + label values
+	Metrics map[ValueHash]*RegisteredMetric
+}
+
+type RegisteredMetric struct {
+	LastRegisteredAt time.Time
+	Labels           prometheus.Labels
+	TTL              time.Duration
+	Metric           MetricHolder
+	VecKey           NameHash
+}

pkg/registry/registry.go

@@ -0,0 +1,428 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package registry
+
+import (
+	"bytes"
+	"fmt"
+	"hash"
+	"hash/fnv"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/model"
+
+	"github.com/prometheus/statsd_exporter/pkg/clock"
+	"github.com/prometheus/statsd_exporter/pkg/mapper"
+	"github.com/prometheus/statsd_exporter/pkg/metrics"
+)
+
+// uncheckedCollector wraps a Collector but its Describe method yields no Desc.
+// This allows incoming metrics to have inconsistent label sets
+type uncheckedCollector struct {
+	c prometheus.Collector
+}
+
+func (u uncheckedCollector) Describe(_ chan<- *prometheus.Desc) {}
+func (u uncheckedCollector) Collect(c chan<- prometheus.Metric) {
+	u.c.Collect(c)
+}
+
+type Registry struct {
+	Registerer prometheus.Registerer
+	Metrics    map[string]metrics.Metric
+	Mapper     *mapper.MetricMapper
+	// The below value and label variables are allocated in the registry struct
+	// so that we don't have to allocate them every time have to compute a label
+	// hash.
+	ValueBuf, NameBuf bytes.Buffer
+	Hasher            hash.Hash64
+}
+
+func NewRegistry(reg prometheus.Registerer, mapper *mapper.MetricMapper) *Registry {
+	return &Registry{
+		Registerer: reg,
+		Metrics:    make(map[string]metrics.Metric),
+		Mapper:     mapper,
+		Hasher:     fnv.New64a(),
+	}
+}
+
+func (r *Registry) MetricConflicts(metricName string, metricType metrics.MetricType) bool {
+	vector, hasMetrics := r.Metrics[metricName]
+	if !hasMetrics {
+		// No metrics.Metric with this name exists
+		return false
+	}
+
+	if vector.MetricType == metricType {
+		// We've found a copy of this metrics.Metric with this type, but different
+		// labels, so it's safe to create a new one.
+		return false
+	}
+
+	// The metrics.Metric exists, but it's of a different type than we're trying to
+	// create.
+	return true
+}
+
+func (r *Registry) StoreCounter(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.CounterVec, c prometheus.Counter, ttl time.Duration) {
+	r.Store(metricName, hash, labels, vec, c, metrics.CounterMetricType, ttl)
+}
+
+func (r *Registry) StoreGauge(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.GaugeVec, g prometheus.Gauge, ttl time.Duration) {
+	r.Store(metricName, hash, labels, vec, g, metrics.GaugeMetricType, ttl)
+}
+
+func (r *Registry) StoreHistogram(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.HistogramVec, o prometheus.Observer, ttl time.Duration) {
+	r.Store(metricName, hash, labels, vec, o, metrics.HistogramMetricType, ttl)
+}
+
+func (r *Registry) StoreSummary(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.SummaryVec, o prometheus.Observer, ttl time.Duration) {
+	r.Store(metricName, hash, labels, vec, o, metrics.SummaryMetricType, ttl)
+}
+
+func (r *Registry) Store(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vh metrics.VectorHolder, mh metrics.MetricHolder, metricType metrics.MetricType, ttl time.Duration) {
+	metric, hasMetrics := r.Metrics[metricName]
+	if !hasMetrics {
+		metric.MetricType = metricType
+		metric.Vectors = make(map[metrics.NameHash]*metrics.Vector)
+		metric.Metrics = make(map[metrics.ValueHash]*metrics.RegisteredMetric)
+
+		r.Metrics[metricName] = metric
+	}
+
+	v, ok := metric.Vectors[hash.Names]
+	if !ok {
+		v = &metrics.Vector{Holder: vh}
+		metric.Vectors[hash.Names] = v
+	}
+
+	now := clock.Now()
+	rm, ok := metric.Metrics[hash.Values]
+	if !ok {
+		rm = &metrics.RegisteredMetric{
+			LastRegisteredAt: now,
+			Labels:           labels,
+			TTL:              ttl,
+			Metric:           mh,
+			VecKey:           hash.Names,
+		}
+		metric.Metrics[hash.Values] = rm
+		v.RefCount++
+		return
+	}
+	rm.LastRegisteredAt = now
+	// Update ttl from mapping
+	rm.TTL = ttl
+}
+
+func (r *Registry) Get(metricName string, hash metrics.LabelHash, metricType metrics.MetricType) (metrics.VectorHolder, metrics.MetricHolder) {
+	metric, hasMetric := r.Metrics[metricName]
+
+	if !hasMetric {
+		return nil, nil
+	}
+	if metric.MetricType != metricType {
+		return nil, nil
+	}
+
+	rm, ok := metric.Metrics[hash.Values]
+	if ok {
+		now := clock.Now()
+		rm.LastRegisteredAt = now
+		return metric.Vectors[hash.Names].Holder, rm.Metric
+	}
+
+	vector, ok := metric.Vectors[hash.Names]
+	if ok {
+		return vector.Holder, nil
+	}
+
+	return nil, nil
+}
+
+func (r *Registry) GetCounter(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Counter, error) {
+	hash, labelNames := r.HashLabels(labels)
+	vh, mh := r.Get(metricName, hash, metrics.CounterMetricType)
+	if mh != nil {
+		return mh.(prometheus.Counter), nil
+	}
+
+	if r.MetricConflicts(metricName, metrics.CounterMetricType) {
+		return nil, fmt.Errorf("metric with name %s is already registered", metricName)
+	}
+
+	err := r.checkHistogramNameCollision(metricName)
+	if err != nil {
+		return nil, err
+	}
+
+	var counterVec *prometheus.CounterVec
+	if vh == nil {
+		metricsCount.WithLabelValues("counter").Inc()
+		counterVec = prometheus.NewCounterVec(prometheus.CounterOpts{
+			Name: metricName,
+			Help: help,
+		}, labelNames)
+
+		if err := r.Registerer.Register(uncheckedCollector{counterVec}); err != nil {
+			return nil, err
+		}
+	} else {
+		counterVec = vh.(*prometheus.CounterVec)
+	}
+
+	var counter prometheus.Counter
+	if counter, err = counterVec.GetMetricWith(labels); err != nil {
+		return nil, err
+	}
+	r.StoreCounter(metricName, hash, labels, counterVec, counter, mapping.Ttl)
+
+	return counter, nil
+}
+
+func (r *Registry) checkHistogramNameCollision(metricName string) error {
+	histogramSuffixes := []string{"_bucket", "_count", "_sum"}
+	for _, suffix := range histogramSuffixes {
+		if strings.HasSuffix(metricName, suffix) {
+			if r.MetricConflicts(strings.TrimSuffix(metricName, suffix), metrics.CounterMetricType) {
+				return fmt.Errorf("metric with name %s is already registered", metricName)
+			}
+		}
+	}
+	return nil
+}
+
+func (r *Registry) GetGauge(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Gauge, error) {
+	hash, labelNames := r.HashLabels(labels)
+	vh, mh := r.Get(metricName, hash, metrics.GaugeMetricType)
+	if mh != nil {
+		return mh.(prometheus.Gauge), nil
+	}
+
+	if r.MetricConflicts(metricName, metrics.GaugeMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+
+	err := r.checkHistogramNameCollision(metricName)
+	if err != nil {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+
+	var gaugeVec *prometheus.GaugeVec
+	if vh == nil {
+		metricsCount.WithLabelValues("gauge").Inc()
+		gaugeVec = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Name: metricName,
+			Help: help,
+		}, labelNames)
+
+		if err := r.Registerer.Register(uncheckedCollector{gaugeVec}); err != nil {
+			return nil, err
+		}
+	} else {
+		gaugeVec = vh.(*prometheus.GaugeVec)
+	}
+
+	var gauge prometheus.Gauge
+	if gauge, err = gaugeVec.GetMetricWith(labels); err != nil {
+		return nil, err
+	}
+	r.StoreGauge(metricName, hash, labels, gaugeVec, gauge, mapping.Ttl)
+
+	return gauge, nil
+}
+
+func (r *Registry) GetHistogram(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Observer, error) {
+	hash, labelNames := r.HashLabels(labels)
+	vh, mh := r.Get(metricName, hash, metrics.HistogramMetricType)
+	if mh != nil {
+		return mh.(prometheus.Observer), nil
+	}
+
+	if r.MetricConflicts(metricName, metrics.HistogramMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+	if r.MetricConflicts(metricName+"_sum", metrics.HistogramMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+	if r.MetricConflicts(metricName+"_count", metrics.HistogramMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+	if r.MetricConflicts(metricName+"_bucket", metrics.HistogramMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+
+	var histogramVec *prometheus.HistogramVec
+	if vh == nil {
+		metricsCount.WithLabelValues("histogram").Inc()
+		buckets := r.Mapper.Defaults.HistogramOptions.Buckets
+		if mapping.HistogramOptions != nil && len(mapping.HistogramOptions.Buckets) > 0 {
+			buckets = mapping.HistogramOptions.Buckets
+		}
+
+		bucketFactor := r.Mapper.Defaults.HistogramOptions.NativeHistogramBucketFactor
+		if mapping.HistogramOptions != nil && mapping.HistogramOptions.NativeHistogramBucketFactor > 0 {
+			bucketFactor = mapping.HistogramOptions.NativeHistogramBucketFactor
+		}
+
+		maxBuckets := r.Mapper.Defaults.HistogramOptions.NativeHistogramMaxBuckets
+		if mapping.HistogramOptions != nil && mapping.HistogramOptions.NativeHistogramMaxBuckets > 0 {
+			maxBuckets = mapping.HistogramOptions.NativeHistogramMaxBuckets
+		}
+		histogramVec = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+			Name:                           metricName,
+			Help:                           help,
+			Buckets:                        buckets,
+			NativeHistogramBucketFactor:    bucketFactor,
+			NativeHistogramMaxBucketNumber: maxBuckets,
+		}, labelNames)
+
+		if err := r.Registerer.Register(uncheckedCollector{histogramVec}); err != nil {
+			return nil, err
+		}
+	} else {
+		histogramVec = vh.(*prometheus.HistogramVec)
+	}
+
+	var observer prometheus.Observer
+	var err error
+	if observer, err = histogramVec.GetMetricWith(labels); err != nil {
+		return nil, err
+	}
+	r.StoreHistogram(metricName, hash, labels, histogramVec, observer, mapping.Ttl)
+
+	return observer, nil
+}
+
+func (r *Registry) GetSummary(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Observer, error) {
+	hash, labelNames := r.HashLabels(labels)
+	vh, mh := r.Get(metricName, hash, metrics.SummaryMetricType)
+	if mh != nil {
+		return mh.(prometheus.Observer), nil
+	}
+
+	if r.MetricConflicts(metricName, metrics.SummaryMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+	if r.MetricConflicts(metricName+"_sum", metrics.SummaryMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+	if r.MetricConflicts(metricName+"_count", metrics.SummaryMetricType) {
+		return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
+	}
+
+	var summaryVec *prometheus.SummaryVec
+	if vh == nil {
+		metricsCount.WithLabelValues("summary").Inc()
+		quantiles := r.Mapper.Defaults.SummaryOptions.Quantiles
+		if mapping != nil && mapping.SummaryOptions != nil && len(mapping.SummaryOptions.Quantiles) > 0 {
+			quantiles = mapping.SummaryOptions.Quantiles
+		}
+
+		summaryOptions := mapper.SummaryOptions{
+			MaxAge:     r.Mapper.Defaults.SummaryOptions.MaxAge,
+			AgeBuckets: r.Mapper.Defaults.SummaryOptions.AgeBuckets,
+			BufCap:     r.Mapper.Defaults.SummaryOptions.BufCap,
+		}
+
+		if mapping != nil && mapping.SummaryOptions != nil {
+			summaryOptions = *mapping.SummaryOptions
+		}
+
+		objectives := make(map[float64]float64)
+		for _, q := range quantiles {
+			objectives[q.Quantile] = q.Error
+		}
+		// In the case of no mapping file, explicitly define the default quantiles
+		if len(objectives) == 0 {
+			objectives = map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001}
+		}
+		summaryVec = prometheus.NewSummaryVec(prometheus.SummaryOpts{
+			Name:       metricName,
+			Help:       help,
+			Objectives: objectives,
+			MaxAge:     summaryOptions.MaxAge,
+			AgeBuckets: summaryOptions.AgeBuckets,
+			BufCap:     summaryOptions.BufCap,
+		}, labelNames)
+
+		if err := r.Registerer.Register(uncheckedCollector{summaryVec}); err != nil {
+			return nil, err
+		}
+	} else {
+		summaryVec = vh.(*prometheus.SummaryVec)
+	}
+
+	var observer prometheus.Observer
+	var err error
+	if observer, err = summaryVec.GetMetricWith(labels); err != nil {
+		return nil, err
+	}
+	r.StoreSummary(metricName, hash, labels, summaryVec, observer, mapping.Ttl)
+
+	return observer, nil
+}
+
+func (r *Registry) RemoveStaleMetrics() {
+	now := clock.Now()
+	// delete timeseries with expired ttl
+	for _, metric := range r.Metrics {
+		for hash, rm := range metric.Metrics {
+			if rm.TTL == 0 {
+				continue
+			}
+			if rm.LastRegisteredAt.Add(rm.TTL).Before(now) {
+				metric.Vectors[rm.VecKey].Holder.Delete(rm.Labels)
+				metric.Vectors[rm.VecKey].RefCount--
+				delete(metric.Metrics, hash)
+			}
+		}
+	}
+}
+
+// Calculates a hash of both the label names and values.
+func (r *Registry) HashLabels(labels prometheus.Labels) (metrics.LabelHash, []string) {
+	r.Hasher.Reset()
+	r.NameBuf.Reset()
+	r.ValueBuf.Reset()
+	labelNames := make([]string, 0, len(labels))
+
+	for labelName := range labels {
+		labelNames = append(labelNames, labelName)
+	}
+	sort.Strings(labelNames)
+
+	r.ValueBuf.WriteByte(model.SeparatorByte)
+	for _, labelName := range labelNames {
+		r.ValueBuf.WriteString(labels[labelName])
+		r.ValueBuf.WriteByte(model.SeparatorByte)
+
+		r.NameBuf.WriteString(labelName)
+		r.NameBuf.WriteByte(model.SeparatorByte)
+	}
+
+	lh := metrics.LabelHash{}
+	r.Hasher.Write(r.NameBuf.Bytes())
+	lh.Names = metrics.NameHash(r.Hasher.Sum64())
+
+	// Now add the values to the names we've already hashed.
+	r.Hasher.Write(r.ValueBuf.Bytes())
+	lh.Values = metrics.ValueHash(r.Hasher.Sum64())
+
+	return lh, labelNames
+}

pkg/relay/relay.go

@@ -0,0 +1,167 @@
+// Copyright 2021 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package relay
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/prometheus/statsd_exporter/pkg/clock"
+
+	"github.com/go-kit/log"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/statsd_exporter/pkg/level"
+)
+
+type Relay struct {
+	addr          *net.UDPAddr
+	bufferChannel chan []byte
+	conn          *net.UDPConn
+	logger        log.Logger
+	packetLength  uint
+
+	packetsTotal      prometheus.Counter
+	longLinesTotal    prometheus.Counter
+	relayedLinesTotal prometheus.Counter
+}
+
+var (
+	relayPacketsTotal = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_relay_packets_total",
+			Help: "The number of StatsD packets relayed.",
+		},
+		[]string{"target"},
+	)
+	relayLongLinesTotal = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_relay_long_lines_total",
+			Help: "The number lines that were too long to relay.",
+		},
+		[]string{"target"},
+	)
+	relayLinesRelayedTotal = promauto.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "statsd_exporter_relay_lines_relayed_total",
+			Help: "The number of lines that were buffered to be relayed.",
+		},
+		[]string{"target"},
+	)
+)
+
+// NewRelay creates a statsd UDP relay. It can be used to send copies of statsd raw
+// lines to a separate service.
+func NewRelay(l log.Logger, target string, packetLength uint) (*Relay, error) {
+	addr, err := net.ResolveUDPAddr("udp", target)
+	if err != nil {
+		return nil, fmt.Errorf("unable to resolve target %s, err: %w", target, err)
+	}
+	conn, err := net.ListenUDP("udp", nil)
+	if err != nil {
+		return nil, fmt.Errorf("unable to listen on UDP, err: %w", err)
+	}
+
+	c := make(chan []byte, 100)
+
+	r := Relay{
+		addr:          addr,
+		bufferChannel: c,
+		conn:          conn,
+		logger:        l,
+		packetLength:  packetLength,
+
+		packetsTotal:      relayPacketsTotal.WithLabelValues(target),
+		longLinesTotal:    relayLongLinesTotal.WithLabelValues(target),
+		relayedLinesTotal: relayLinesRelayedTotal.WithLabelValues(target),
+	}
+
+	// Startup the UDP sender.
+	go r.relayOutput()
+
+	return &r, nil
+}
+
+// relayOutput buffers statsd lines and sends them to the relay target.
+func (r *Relay) relayOutput() {
+	var buffer bytes.Buffer
+	var err error
+
+	relayInterval := clock.NewTicker(1 * time.Second)
+	defer relayInterval.Stop()
+
+	for {
+		select {
+		case <-relayInterval.C:
+			err = r.sendPacket(buffer.Bytes())
+			if err != nil {
+				level.Error(r.logger).Log("msg", "Error sending UDP packet", "error", err)
+				return
+			}
+			// Clear out the buffer.
+			buffer.Reset()
+		case b := <-r.bufferChannel:
+			if uint(len(b)+buffer.Len()) > r.packetLength {
+				level.Debug(r.logger).Log("msg", "Buffer full, sending packet", "length", buffer.Len())
+				err = r.sendPacket(buffer.Bytes())
+				if err != nil {
+					level.Error(r.logger).Log("msg", "Error sending UDP packet", "error", err)
+					return
+				}
+				// Seed the new buffer with the new line.
+				buffer.Reset()
+				buffer.Write(b)
+			} else {
+				level.Debug(r.logger).Log("msg", "Adding line to buffer", "line", string(b))
+				buffer.Write(b)
+			}
+		}
+	}
+}
+
+// sendPacket sends a single relay line to the destination target.
+func (r *Relay) sendPacket(buf []byte) error {
+	if len(buf) == 0 {
+		level.Debug(r.logger).Log("msg", "Empty buffer, nothing to send")
+		return nil
+	}
+	level.Debug(r.logger).Log("msg", "Sending packet", "length", len(buf), "data", string(buf))
+	_, err := r.conn.WriteToUDP(buf, r.addr)
+	r.packetsTotal.Inc()
+	return err
+}
+
+// RelayLine processes a single statsd line and forwards it to the relay target.
+func (r *Relay) RelayLine(l string) {
+	lineLength := uint(len(l))
+	if lineLength == 0 {
+		level.Debug(r.logger).Log("msg", "Empty line, not relaying")
+		return
+	}
+	if lineLength > r.packetLength-1 {
+		level.Warn(r.logger).Log("msg", "line too long, not relaying", "length", lineLength, "max", r.packetLength)
+		r.longLinesTotal.Inc()
+		return
+	}
+	level.Debug(r.logger).Log("msg", "Relaying line", "line", string(l))
+	if !strings.HasSuffix(l, "\n") {
+		l = l + "\n"
+	}
+	r.relayedLinesTotal.Inc()
+	r.bufferChannel <- []byte(l)
+}

pkg/relay/relay_test.go

@@ -0,0 +1,176 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package relay
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+	"time"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+	dto "github.com/prometheus/client_model/go"
+	"github.com/prometheus/statsd_exporter/pkg/clock"
+	"github.com/stvp/go-udp-testing"
+)
+
+func TestRelay_RelayLine(t *testing.T) {
+	type args struct {
+		lines    []string
+		expected string
+	}
+
+	tests := []struct {
+		name string
+		args args
+	}{
+		{
+			name: "multiple lines",
+			args: args{
+				lines:    []string{"foo5:100|c|#tag1:bar,#tag2:baz", "foo2:200|c|#tag1:bar,#tag2:baz"},
+				expected: "foo5:100|c|#tag1:bar,#tag2:baz\n",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		udp.SetAddr(":1160")
+		t.Run(tt.name, func(t *testing.T) {
+			tickerCh := make(chan time.Time)
+			clock.ClockInstance = &clock.Clock{
+				TickerCh: tickerCh,
+			}
+			clock.ClockInstance.Instant = time.Unix(0, 0)
+
+			logger := log.NewNopLogger()
+			r, err := NewRelay(
+				logger,
+				"localhost:1160",
+				200,
+			)
+
+			if err != nil {
+				t.Errorf("Did not expect error while creating relay.")
+			}
+
+			udp.ShouldReceive(t, tt.args.expected, func() {
+				for _, line := range tt.args.lines {
+					r.RelayLine(line)
+				}
+
+				for goSchedTimes := 0; goSchedTimes < 1000; goSchedTimes++ {
+					if len(r.bufferChannel) == 0 {
+						break
+					}
+					runtime.Gosched()
+				}
+
+				// Tick time forward to trigger a packet send.
+				clock.ClockInstance.Instant = time.Unix(1, 10)
+				clock.ClockInstance.TickerCh <- time.Unix(0, 0)
+			})
+
+			metrics, err := prometheus.DefaultGatherer.Gather()
+			if err != nil {
+				t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
+			}
+
+			metricNames := map[string]float64{
+				"statsd_exporter_relay_long_lines_total":    0,
+				"statsd_exporter_relay_lines_relayed_total": float64(len(tt.args.lines)),
+			}
+			for metricName, expectedValue := range metricNames {
+				metric := getFloat64(metrics, metricName, prometheus.Labels{"target": "localhost:1160"})
+
+				if metric == nil {
+					t.Fatalf("Could not find time series with first label set for metric: %s", metricName)
+				}
+				if *metric != expectedValue {
+					t.Errorf("Expected metric %s to be %f, got %f", metricName, expectedValue, *metric)
+				}
+			}
+
+			prometheus.Unregister(relayLongLinesTotal)
+			prometheus.Unregister(relayLinesRelayedTotal)
+		})
+	}
+}
+
+// getFloat64 search for metric by name in array of MetricFamily and then search a value by labels.
+// Method returns a value or nil if metric is not found.
+func getFloat64(metrics []*dto.MetricFamily, name string, labels prometheus.Labels) *float64 {
+	var metricFamily *dto.MetricFamily
+	for _, m := range metrics {
+		if *m.Name == name {
+			metricFamily = m
+			break
+		}
+	}
+	if metricFamily == nil {
+		return nil
+	}
+
+	var metric *dto.Metric
+	labelStr := fmt.Sprintf("%v", labels)
+	for _, m := range metricFamily.Metric {
+		l := labelPairsAsLabels(m.GetLabel())
+		ls := fmt.Sprintf("%v", l)
+		if labelStr == ls {
+			metric = m
+			break
+		}
+	}
+	if metric == nil {
+		return nil
+	}
+
+	var value float64
+	if metric.Gauge != nil {
+		value = metric.Gauge.GetValue()
+		return &value
+	}
+	if metric.Counter != nil {
+		value = metric.Counter.GetValue()
+		return &value
+	}
+	if metric.Histogram != nil {
+		value = metric.Histogram.GetSampleSum()
+		return &value
+	}
+	if metric.Summary != nil {
+		value = metric.Summary.GetSampleSum()
+		return &value
+	}
+	if metric.Untyped != nil {
+		value = metric.Untyped.GetValue()
+		return &value
+	}
+	panic(fmt.Errorf("collected a non-gauge/counter/histogram/summary/untyped metric: %s", metric))
+}
+
+func labelPairsAsLabels(pairs []*dto.LabelPair) (labels prometheus.Labels) {
+	labels = prometheus.Labels{}
+	for _, pair := range pairs {
+		if pair.Name == nil {
+			continue
+		}
+		value := ""
+		if pair.Value != nil {
+			value = *pair.Value
+		}
+		labels[*pair.Name] = value
+	}
+	return
+}

telemetry.go

@@ -1,122 +0,0 @@
-// Copyright 2013 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package main
-
-import (
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-var (
-	eventStats = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_events_total",
-			Help: "The total number of StatsD events seen.",
-		},
-		[]string{"type"},
-	)
-	eventsUnmapped = prometheus.NewCounter(prometheus.CounterOpts{
-		Name: "statsd_exporter_events_unmapped_total",
-		Help: "The total number of StatsD events no mapping was found for.",
-	})
-	udpPackets = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_udp_packets_total",
-			Help: "The total number of StatsD packets received over UDP.",
-		},
-	)
-	tcpConnections = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_tcp_connections_total",
-			Help: "The total number of TCP connections handled.",
-		},
-	)
-	tcpErrors = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_tcp_connection_errors_total",
-			Help: "The number of errors encountered reading from TCP.",
-		},
-	)
-	tcpLineTooLong = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_tcp_too_long_lines_total",
-			Help: "The number of lines discarded due to being too long.",
-		},
-	)
-	linesReceived = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_lines_total",
-			Help: "The total number of StatsD lines received.",
-		},
-	)
-	samplesReceived = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_samples_total",
-			Help: "The total number of StatsD samples received.",
-		},
-	)
-	sampleErrors = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_sample_errors_total",
-			Help: "The total number of errors parsing StatsD samples.",
-		},
-		[]string{"reason"},
-	)
-	tagsReceived = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_tags_total",
-			Help: "The total number of DogStatsD tags processed.",
-		},
-	)
-	tagErrors = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_tag_errors_total",
-			Help: "The number of errors parsign DogStatsD tags.",
-		},
-	)
-	configLoads = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_config_reloads_total",
-			Help: "The number of configuration reloads.",
-		},
-		[]string{"outcome"},
-	)
-	mappingsCount = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "statsd_exporter_loaded_mappings",
-		Help: "The current number of configured metric mappings.",
-	})
-	conflictingEventStats = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "statsd_exporter_events_conflict_total",
-			Help: "The total number of StatsD events with conflicting names.",
-		},
-		[]string{"type"},
-	)
-)
-
-func init() {
-	prometheus.MustRegister(eventStats)
-	prometheus.MustRegister(eventsUnmapped)
-	prometheus.MustRegister(udpPackets)
-	prometheus.MustRegister(tcpConnections)
-	prometheus.MustRegister(tcpErrors)
-	prometheus.MustRegister(tcpLineTooLong)
-	prometheus.MustRegister(linesReceived)
-	prometheus.MustRegister(samplesReceived)
-	prometheus.MustRegister(sampleErrors)
-	prometheus.MustRegister(tagsReceived)
-	prometheus.MustRegister(tagErrors)
-	prometheus.MustRegister(configLoads)
-	prometheus.MustRegister(mappingsCount)
-	prometheus.MustRegister(conflictingEventStats)
-}

vendor/github.com/alecthomas/template/LICENSE

@@ -1,27 +0,0 @@
-Copyright (c) 2012 The Go Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/alecthomas/template/README.md

@@ -1,25 +0,0 @@
-# Go's `text/template` package with newline elision
-
-This is a fork of Go 1.4's [text/template](http://golang.org/pkg/text/template/) package with one addition: a backslash immediately after a closing delimiter will delete all subsequent newlines until a non-newline.
-
-eg.
-
-```
-{{if true}}\
-hello
-{{end}}\
-```
-
-Will result in:
-
-```
-hello\n
-```
-
-Rather than:
-
-```
-\n
-hello\n
-\n
-```

vendor/github.com/alecthomas/template/doc.go

@@ -1,406 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-/*
-Package template implements data-driven templates for generating textual output.
-
-To generate HTML output, see package html/template, which has the same interface
-as this package but automatically secures HTML output against certain attacks.
-
-Templates are executed by applying them to a data structure. Annotations in the
-template refer to elements of the data structure (typically a field of a struct
-or a key in a map) to control execution and derive values to be displayed.
-Execution of the template walks the structure and sets the cursor, represented
-by a period '.' and called "dot", to the value at the current location in the
-structure as execution proceeds.
-
-The input text for a template is UTF-8-encoded text in any format.
-"Actions"--data evaluations or control structures--are delimited by
-"{{" and "}}"; all text outside actions is copied to the output unchanged.
-Actions may not span newlines, although comments can.
-
-Once parsed, a template may be executed safely in parallel.
-
-Here is a trivial example that prints "17 items are made of wool".
-
-	type Inventory struct {
-		Material string
-		Count    uint
-	}
-	sweaters := Inventory{"wool", 17}
-	tmpl, err := template.New("test").Parse("{{.Count}} items are made of {{.Material}}")
-	if err != nil { panic(err) }
-	err = tmpl.Execute(os.Stdout, sweaters)
-	if err != nil { panic(err) }
-
-More intricate examples appear below.
-
-Actions
-
-Here is the list of actions. "Arguments" and "pipelines" are evaluations of
-data, defined in detail below.
-
-*/
-//	{{/* a comment */}}
-//		A comment; discarded. May contain newlines.
-//		Comments do not nest and must start and end at the
-//		delimiters, as shown here.
-/*
-
-	{{pipeline}}
-		The default textual representation of the value of the pipeline
-		is copied to the output.
-
-	{{if pipeline}} T1 {{end}}
-		If the value of the pipeline is empty, no output is generated;
-		otherwise, T1 is executed.  The empty values are false, 0, any
-		nil pointer or interface value, and any array, slice, map, or
-		string of length zero.
-		Dot is unaffected.
-
-	{{if pipeline}} T1 {{else}} T0 {{end}}
-		If the value of the pipeline is empty, T0 is executed;
-		otherwise, T1 is executed.  Dot is unaffected.
-
-	{{if pipeline}} T1 {{else if pipeline}} T0 {{end}}
-		To simplify the appearance of if-else chains, the else action
-		of an if may include another if directly; the effect is exactly
-		the same as writing
-			{{if pipeline}} T1 {{else}}{{if pipeline}} T0 {{end}}{{end}}
-
-	{{range pipeline}} T1 {{end}}
-		The value of the pipeline must be an array, slice, map, or channel.
-		If the value of the pipeline has length zero, nothing is output;
-		otherwise, dot is set to the successive elements of the array,
-		slice, or map and T1 is executed. If the value is a map and the
-		keys are of basic type with a defined order ("comparable"), the
-		elements will be visited in sorted key order.
-
-	{{range pipeline}} T1 {{else}} T0 {{end}}
-		The value of the pipeline must be an array, slice, map, or channel.
-		If the value of the pipeline has length zero, dot is unaffected and
-		T0 is executed; otherwise, dot is set to the successive elements
-		of the array, slice, or map and T1 is executed.
-
-	{{template "name"}}
-		The template with the specified name is executed with nil data.
-
-	{{template "name" pipeline}}
-		The template with the specified name is executed with dot set
-		to the value of the pipeline.
-
-	{{with pipeline}} T1 {{end}}
-		If the value of the pipeline is empty, no output is generated;
-		otherwise, dot is set to the value of the pipeline and T1 is
-		executed.
-
-	{{with pipeline}} T1 {{else}} T0 {{end}}
-		If the value of the pipeline is empty, dot is unaffected and T0
-		is executed; otherwise, dot is set to the value of the pipeline
-		and T1 is executed.
-
-Arguments
-
-An argument is a simple value, denoted by one of the following.
-
-	- A boolean, string, character, integer, floating-point, imaginary
-	  or complex constant in Go syntax. These behave like Go's untyped
-	  constants, although raw strings may not span newlines.
-	- The keyword nil, representing an untyped Go nil.
-	- The character '.' (period):
-		.
-	  The result is the value of dot.
-	- A variable name, which is a (possibly empty) alphanumeric string
-	  preceded by a dollar sign, such as
-		$piOver2
-	  or
-		$
-	  The result is the value of the variable.
-	  Variables are described below.
-	- The name of a field of the data, which must be a struct, preceded
-	  by a period, such as
-		.Field
-	  The result is the value of the field. Field invocations may be
-	  chained:
-	    .Field1.Field2
-	  Fields can also be evaluated on variables, including chaining:
-	    $x.Field1.Field2
-	- The name of a key of the data, which must be a map, preceded
-	  by a period, such as
-		.Key
-	  The result is the map element value indexed by the key.
-	  Key invocations may be chained and combined with fields to any
-	  depth:
-	    .Field1.Key1.Field2.Key2
-	  Although the key must be an alphanumeric identifier, unlike with
-	  field names they do not need to start with an upper case letter.
-	  Keys can also be evaluated on variables, including chaining:
-	    $x.key1.key2
-	- The name of a niladic method of the data, preceded by a period,
-	  such as
-		.Method
-	  The result is the value of invoking the method with dot as the
-	  receiver, dot.Method(). Such a method must have one return value (of
-	  any type) or two return values, the second of which is an error.
-	  If it has two and the returned error is non-nil, execution terminates
-	  and an error is returned to the caller as the value of Execute.
-	  Method invocations may be chained and combined with fields and keys
-	  to any depth:
-	    .Field1.Key1.Method1.Field2.Key2.Method2
-	  Methods can also be evaluated on variables, including chaining:
-	    $x.Method1.Field
-	- The name of a niladic function, such as
-		fun
-	  The result is the value of invoking the function, fun(). The return
-	  types and values behave as in methods. Functions and function
-	  names are described below.
-	- A parenthesized instance of one the above, for grouping. The result
-	  may be accessed by a field or map key invocation.
-		print (.F1 arg1) (.F2 arg2)
-		(.StructValuedMethod "arg").Field
-
-Arguments may evaluate to any type; if they are pointers the implementation
-automatically indirects to the base type when required.
-If an evaluation yields a function value, such as a function-valued
-field of a struct, the function is not invoked automatically, but it
-can be used as a truth value for an if action and the like. To invoke
-it, use the call function, defined below.
-
-A pipeline is a possibly chained sequence of "commands". A command is a simple
-value (argument) or a function or method call, possibly with multiple arguments:
-
-	Argument
-		The result is the value of evaluating the argument.
-	.Method [Argument...]
-		The method can be alone or the last element of a chain but,
-		unlike methods in the middle of a chain, it can take arguments.
-		The result is the value of calling the method with the
-		arguments:
-			dot.Method(Argument1, etc.)
-	functionName [Argument...]
-		The result is the value of calling the function associated
-		with the name:
-			function(Argument1, etc.)
-		Functions and function names are described below.
-
-Pipelines
-
-A pipeline may be "chained" by separating a sequence of commands with pipeline
-characters '|'. In a chained pipeline, the result of the each command is
-passed as the last argument of the following command. The output of the final
-command in the pipeline is the value of the pipeline.
-
-The output of a command will be either one value or two values, the second of
-which has type error. If that second value is present and evaluates to
-non-nil, execution terminates and the error is returned to the caller of
-Execute.
-
-Variables
-
-A pipeline inside an action may initialize a variable to capture the result.
-The initialization has syntax
-
-	$variable := pipeline
-
-where $variable is the name of the variable. An action that declares a
-variable produces no output.
-
-If a "range" action initializes a variable, the variable is set to the
-successive elements of the iteration.  Also, a "range" may declare two
-variables, separated by a comma:
-
-	range $index, $element := pipeline
-
-in which case $index and $element are set to the successive values of the
-array/slice index or map key and element, respectively.  Note that if there is
-only one variable, it is assigned the element; this is opposite to the
-convention in Go range clauses.
-
-A variable's scope extends to the "end" action of the control structure ("if",
-"with", or "range") in which it is declared, or to the end of the template if
-there is no such control structure.  A template invocation does not inherit
-variables from the point of its invocation.
-
-When execution begins, $ is set to the data argument passed to Execute, that is,
-to the starting value of dot.
-
-Examples
-
-Here are some example one-line templates demonstrating pipelines and variables.
-All produce the quoted word "output":
-
-	{{"\"output\""}}
-		A string constant.
-	{{`"output"`}}
-		A raw string constant.
-	{{printf "%q" "output"}}
-		A function call.
-	{{"output" | printf "%q"}}
-		A function call whose final argument comes from the previous
-		command.
-	{{printf "%q" (print "out" "put")}}
-		A parenthesized argument.
-	{{"put" | printf "%s%s" "out" | printf "%q"}}
-		A more elaborate call.
-	{{"output" | printf "%s" | printf "%q"}}
-		A longer chain.
-	{{with "output"}}{{printf "%q" .}}{{end}}
-		A with action using dot.
-	{{with $x := "output" | printf "%q"}}{{$x}}{{end}}
-		A with action that creates and uses a variable.
-	{{with $x := "output"}}{{printf "%q" $x}}{{end}}
-		A with action that uses the variable in another action.
-	{{with $x := "output"}}{{$x | printf "%q"}}{{end}}
-		The same, but pipelined.
-
-Functions
-
-During execution functions are found in two function maps: first in the
-template, then in the global function map. By default, no functions are defined
-in the template but the Funcs method can be used to add them.
-
-Predefined global functions are named as follows.
-
-	and
-		Returns the boolean AND of its arguments by returning the
-		first empty argument or the last argument, that is,
-		"and x y" behaves as "if x then y else x". All the
-		arguments are evaluated.
-	call
-		Returns the result of calling the first argument, which
-		must be a function, with the remaining arguments as parameters.
-		Thus "call .X.Y 1 2" is, in Go notation, dot.X.Y(1, 2) where
-		Y is a func-valued field, map entry, or the like.
-		The first argument must be the result of an evaluation
-		that yields a value of function type (as distinct from
-		a predefined function such as print). The function must
-		return either one or two result values, the second of which
-		is of type error. If the arguments don't match the function
-		or the returned error value is non-nil, execution stops.
-	html
-		Returns the escaped HTML equivalent of the textual
-		representation of its arguments.
-	index
-		Returns the result of indexing its first argument by the
-		following arguments. Thus "index x 1 2 3" is, in Go syntax,
-		x[1][2][3]. Each indexed item must be a map, slice, or array.
-	js
-		Returns the escaped JavaScript equivalent of the textual
-		representation of its arguments.
-	len
-		Returns the integer length of its argument.
-	not
-		Returns the boolean negation of its single argument.
-	or
-		Returns the boolean OR of its arguments by returning the
-		first non-empty argument or the last argument, that is,
-		"or x y" behaves as "if x then x else y". All the
-		arguments are evaluated.
-	print
-		An alias for fmt.Sprint
-	printf
-		An alias for fmt.Sprintf
-	println
-		An alias for fmt.Sprintln
-	urlquery
-		Returns the escaped value of the textual representation of
-		its arguments in a form suitable for embedding in a URL query.
-
-The boolean functions take any zero value to be false and a non-zero
-value to be true.
-
-There is also a set of binary comparison operators defined as
-functions:
-
-	eq
-		Returns the boolean truth of arg1 == arg2
-	ne
-		Returns the boolean truth of arg1 != arg2
-	lt
-		Returns the boolean truth of arg1 < arg2
-	le
-		Returns the boolean truth of arg1 <= arg2
-	gt
-		Returns the boolean truth of arg1 > arg2
-	ge
-		Returns the boolean truth of arg1 >= arg2
-
-For simpler multi-way equality tests, eq (only) accepts two or more
-arguments and compares the second and subsequent to the first,
-returning in effect
-
-	arg1==arg2 || arg1==arg3 || arg1==arg4 ...
-
-(Unlike with || in Go, however, eq is a function call and all the
-arguments will be evaluated.)
-
-The comparison functions work on basic types only (or named basic
-types, such as "type Celsius float32"). They implement the Go rules
-for comparison of values, except that size and exact type are
-ignored, so any integer value, signed or unsigned, may be compared
-with any other integer value. (The arithmetic value is compared,
-not the bit pattern, so all negative integers are less than all
-unsigned integers.) However, as usual, one may not compare an int
-with a float32 and so on.
-
-Associated templates
-
-Each template is named by a string specified when it is created. Also, each
-template is associated with zero or more other templates that it may invoke by
-name; such associations are transitive and form a name space of templates.
-
-A template may use a template invocation to instantiate another associated
-template; see the explanation of the "template" action above. The name must be
-that of a template associated with the template that contains the invocation.
-
-Nested template definitions
-
-When parsing a template, another template may be defined and associated with the
-template being parsed. Template definitions must appear at the top level of the
-template, much like global variables in a Go program.
-
-The syntax of such definitions is to surround each template declaration with a
-"define" and "end" action.
-
-The define action names the template being created by providing a string
-constant. Here is a simple example:
-
-	`{{define "T1"}}ONE{{end}}
-	{{define "T2"}}TWO{{end}}
-	{{define "T3"}}{{template "T1"}} {{template "T2"}}{{end}}
-	{{template "T3"}}`
-
-This defines two templates, T1 and T2, and a third T3 that invokes the other two
-when it is executed. Finally it invokes T3. If executed this template will
-produce the text
-
-	ONE TWO
-
-By construction, a template may reside in only one association. If it's
-necessary to have a template addressable from multiple associations, the
-template definition must be parsed multiple times to create distinct *Template
-values, or must be copied with the Clone or AddParseTree method.
-
-Parse may be called multiple times to assemble the various associated templates;
-see the ParseFiles and ParseGlob functions and methods for simple ways to parse
-related templates stored in files.
-
-A template may be executed directly or through ExecuteTemplate, which executes
-an associated template identified by name. To invoke our example above, we
-might write,
-
-	err := tmpl.Execute(os.Stdout, "no data needed")
-	if err != nil {
-		log.Fatalf("execution failed: %s", err)
-	}
-
-or to invoke a particular template explicitly by name,
-
-	err := tmpl.ExecuteTemplate(os.Stdout, "T2", "no data needed")
-	if err != nil {
-		log.Fatalf("execution failed: %s", err)
-	}
-
-*/
-package template

vendor/github.com/alecthomas/template/exec.go

@@ -1,845 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package template
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"reflect"
-	"runtime"
-	"sort"
-	"strings"
-
-	"github.com/alecthomas/template/parse"
-)
-
-// state represents the state of an execution. It's not part of the
-// template so that multiple executions of the same template
-// can execute in parallel.
-type state struct {
-	tmpl *Template
-	wr   io.Writer
-	node parse.Node // current node, for errors
-	vars []variable // push-down stack of variable values.
-}
-
-// variable holds the dynamic value of a variable such as $, $x etc.
-type variable struct {
-	name  string
-	value reflect.Value
-}
-
-// push pushes a new variable on the stack.
-func (s *state) push(name string, value reflect.Value) {
-	s.vars = append(s.vars, variable{name, value})
-}
-
-// mark returns the length of the variable stack.
-func (s *state) mark() int {
-	return len(s.vars)
-}
-
-// pop pops the variable stack up to the mark.
-func (s *state) pop(mark int) {
-	s.vars = s.vars[0:mark]
-}
-
-// setVar overwrites the top-nth variable on the stack. Used by range iterations.
-func (s *state) setVar(n int, value reflect.Value) {
-	s.vars[len(s.vars)-n].value = value
-}
-
-// varValue returns the value of the named variable.
-func (s *state) varValue(name string) reflect.Value {
-	for i := s.mark() - 1; i >= 0; i-- {
-		if s.vars[i].name == name {
-			return s.vars[i].value
-		}
-	}
-	s.errorf("undefined variable: %s", name)
-	return zero
-}
-
-var zero reflect.Value
-
-// at marks the state to be on node n, for error reporting.
-func (s *state) at(node parse.Node) {
-	s.node = node
-}
-
-// doublePercent returns the string with %'s replaced by %%, if necessary,
-// so it can be used safely inside a Printf format string.
-func doublePercent(str string) string {
-	if strings.Contains(str, "%") {
-		str = strings.Replace(str, "%", "%%", -1)
-	}
-	return str
-}
-
-// errorf formats the error and terminates processing.
-func (s *state) errorf(format string, args ...interface{}) {
-	name := doublePercent(s.tmpl.Name())
-	if s.node == nil {
-		format = fmt.Sprintf("template: %s: %s", name, format)
-	} else {
-		location, context := s.tmpl.ErrorContext(s.node)
-		format = fmt.Sprintf("template: %s: executing %q at <%s>: %s", location, name, doublePercent(context), format)
-	}
-	panic(fmt.Errorf(format, args...))
-}
-
-// errRecover is the handler that turns panics into returns from the top
-// level of Parse.
-func errRecover(errp *error) {
-	e := recover()
-	if e != nil {
-		switch err := e.(type) {
-		case runtime.Error:
-			panic(e)
-		case error:
-			*errp = err
-		default:
-			panic(e)
-		}
-	}
-}
-
-// ExecuteTemplate applies the template associated with t that has the given name
-// to the specified data object and writes the output to wr.
-// If an error occurs executing the template or writing its output,
-// execution stops, but partial results may already have been written to
-// the output writer.
-// A template may be executed safely in parallel.
-func (t *Template) ExecuteTemplate(wr io.Writer, name string, data interface{}) error {
-	tmpl := t.tmpl[name]
-	if tmpl == nil {
-		return fmt.Errorf("template: no template %q associated with template %q", name, t.name)
-	}
-	return tmpl.Execute(wr, data)
-}
-
-// Execute applies a parsed template to the specified data object,
-// and writes the output to wr.
-// If an error occurs executing the template or writing its output,
-// execution stops, but partial results may already have been written to
-// the output writer.
-// A template may be executed safely in parallel.
-func (t *Template) Execute(wr io.Writer, data interface{}) (err error) {
-	defer errRecover(&err)
-	value := reflect.ValueOf(data)
-	state := &state{
-		tmpl: t,
-		wr:   wr,
-		vars: []variable{{"$", value}},
-	}
-	t.init()
-	if t.Tree == nil || t.Root == nil {
-		var b bytes.Buffer
-		for name, tmpl := range t.tmpl {
-			if tmpl.Tree == nil || tmpl.Root == nil {
-				continue
-			}
-			if b.Len() > 0 {
-				b.WriteString(", ")
-			}
-			fmt.Fprintf(&b, "%q", name)
-		}
-		var s string
-		if b.Len() > 0 {
-			s = "; defined templates are: " + b.String()
-		}
-		state.errorf("%q is an incomplete or empty template%s", t.Name(), s)
-	}
-	state.walk(value, t.Root)
-	return
-}
-
-// Walk functions step through the major pieces of the template structure,
-// generating output as they go.
-func (s *state) walk(dot reflect.Value, node parse.Node) {
-	s.at(node)
-	switch node := node.(type) {
-	case *parse.ActionNode:
-		// Do not pop variables so they persist until next end.
-		// Also, if the action declares variables, don't print the result.
-		val := s.evalPipeline(dot, node.Pipe)
-		if len(node.Pipe.Decl) == 0 {
-			s.printValue(node, val)
-		}
-	case *parse.IfNode:
-		s.walkIfOrWith(parse.NodeIf, dot, node.Pipe, node.List, node.ElseList)
-	case *parse.ListNode:
-		for _, node := range node.Nodes {
-			s.walk(dot, node)
-		}
-	case *parse.RangeNode:
-		s.walkRange(dot, node)
-	case *parse.TemplateNode:
-		s.walkTemplate(dot, node)
-	case *parse.TextNode:
-		if _, err := s.wr.Write(node.Text); err != nil {
-			s.errorf("%s", err)
-		}
-	case *parse.WithNode:
-		s.walkIfOrWith(parse.NodeWith, dot, node.Pipe, node.List, node.ElseList)
-	default:
-		s.errorf("unknown node: %s", node)
-	}
-}
-
-// walkIfOrWith walks an 'if' or 'with' node. The two control structures
-// are identical in behavior except that 'with' sets dot.
-func (s *state) walkIfOrWith(typ parse.NodeType, dot reflect.Value, pipe *parse.PipeNode, list, elseList *parse.ListNode) {
-	defer s.pop(s.mark())
-	val := s.evalPipeline(dot, pipe)
-	truth, ok := isTrue(val)
-	if !ok {
-		s.errorf("if/with can't use %v", val)
-	}
-	if truth {
-		if typ == parse.NodeWith {
-			s.walk(val, list)
-		} else {
-			s.walk(dot, list)
-		}
-	} else if elseList != nil {
-		s.walk(dot, elseList)
-	}
-}
-
-// isTrue reports whether the value is 'true', in the sense of not the zero of its type,
-// and whether the value has a meaningful truth value.
-func isTrue(val reflect.Value) (truth, ok bool) {
-	if !val.IsValid() {
-		// Something like var x interface{}, never set. It's a form of nil.
-		return false, true
-	}
-	switch val.Kind() {
-	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
-		truth = val.Len() > 0
-	case reflect.Bool:
-		truth = val.Bool()
-	case reflect.Complex64, reflect.Complex128:
-		truth = val.Complex() != 0
-	case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Interface:
-		truth = !val.IsNil()
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		truth = val.Int() != 0
-	case reflect.Float32, reflect.Float64:
-		truth = val.Float() != 0
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		truth = val.Uint() != 0
-	case reflect.Struct:
-		truth = true // Struct values are always true.
-	default:
-		return
-	}
-	return truth, true
-}
-
-func (s *state) walkRange(dot reflect.Value, r *parse.RangeNode) {
-	s.at(r)
-	defer s.pop(s.mark())
-	val, _ := indirect(s.evalPipeline(dot, r.Pipe))
-	// mark top of stack before any variables in the body are pushed.
-	mark := s.mark()
-	oneIteration := func(index, elem reflect.Value) {
-		// Set top var (lexically the second if there are two) to the element.
-		if len(r.Pipe.Decl) > 0 {
-			s.setVar(1, elem)
-		}
-		// Set next var (lexically the first if there are two) to the index.
-		if len(r.Pipe.Decl) > 1 {
-			s.setVar(2, index)
-		}
-		s.walk(elem, r.List)
-		s.pop(mark)
-	}
-	switch val.Kind() {
-	case reflect.Array, reflect.Slice:
-		if val.Len() == 0 {
-			break
-		}
-		for i := 0; i < val.Len(); i++ {
-			oneIteration(reflect.ValueOf(i), val.Index(i))
-		}
-		return
-	case reflect.Map:
-		if val.Len() == 0 {
-			break
-		}
-		for _, key := range sortKeys(val.MapKeys()) {
-			oneIteration(key, val.MapIndex(key))
-		}
-		return
-	case reflect.Chan:
-		if val.IsNil() {
-			break
-		}
-		i := 0
-		for ; ; i++ {
-			elem, ok := val.Recv()
-			if !ok {
-				break
-			}
-			oneIteration(reflect.ValueOf(i), elem)
-		}
-		if i == 0 {
-			break
-		}
-		return
-	case reflect.Invalid:
-		break // An invalid value is likely a nil map, etc. and acts like an empty map.
-	default:
-		s.errorf("range can't iterate over %v", val)
-	}
-	if r.ElseList != nil {
-		s.walk(dot, r.ElseList)
-	}
-}
-
-func (s *state) walkTemplate(dot reflect.Value, t *parse.TemplateNode) {
-	s.at(t)
-	tmpl := s.tmpl.tmpl[t.Name]
-	if tmpl == nil {
-		s.errorf("template %q not defined", t.Name)
-	}
-	// Variables declared by the pipeline persist.
-	dot = s.evalPipeline(dot, t.Pipe)
-	newState := *s
-	newState.tmpl = tmpl
-	// No dynamic scoping: template invocations inherit no variables.
-	newState.vars = []variable{{"$", dot}}
-	newState.walk(dot, tmpl.Root)
-}
-
-// Eval functions evaluate pipelines, commands, and their elements and extract
-// values from the data structure by examining fields, calling methods, and so on.
-// The printing of those values happens only through walk functions.
-
-// evalPipeline returns the value acquired by evaluating a pipeline. If the
-// pipeline has a variable declaration, the variable will be pushed on the
-// stack. Callers should therefore pop the stack after they are finished
-// executing commands depending on the pipeline value.
-func (s *state) evalPipeline(dot reflect.Value, pipe *parse.PipeNode) (value reflect.Value) {
-	if pipe == nil {
-		return
-	}
-	s.at(pipe)
-	for _, cmd := range pipe.Cmds {
-		value = s.evalCommand(dot, cmd, value) // previous value is this one's final arg.
-		// If the object has type interface{}, dig down one level to the thing inside.
-		if value.Kind() == reflect.Interface && value.Type().NumMethod() == 0 {
-			value = reflect.ValueOf(value.Interface()) // lovely!
-		}
-	}
-	for _, variable := range pipe.Decl {
-		s.push(variable.Ident[0], value)
-	}
-	return value
-}
-
-func (s *state) notAFunction(args []parse.Node, final reflect.Value) {
-	if len(args) > 1 || final.IsValid() {
-		s.errorf("can't give argument to non-function %s", args[0])
-	}
-}
-
-func (s *state) evalCommand(dot reflect.Value, cmd *parse.CommandNode, final reflect.Value) reflect.Value {
-	firstWord := cmd.Args[0]
-	switch n := firstWord.(type) {
-	case *parse.FieldNode:
-		return s.evalFieldNode(dot, n, cmd.Args, final)
-	case *parse.ChainNode:
-		return s.evalChainNode(dot, n, cmd.Args, final)
-	case *parse.IdentifierNode:
-		// Must be a function.
-		return s.evalFunction(dot, n, cmd, cmd.Args, final)
-	case *parse.PipeNode:
-		// Parenthesized pipeline. The arguments are all inside the pipeline; final is ignored.
-		return s.evalPipeline(dot, n)
-	case *parse.VariableNode:
-		return s.evalVariableNode(dot, n, cmd.Args, final)
-	}
-	s.at(firstWord)
-	s.notAFunction(cmd.Args, final)
-	switch word := firstWord.(type) {
-	case *parse.BoolNode:
-		return reflect.ValueOf(word.True)
-	case *parse.DotNode:
-		return dot
-	case *parse.NilNode:
-		s.errorf("nil is not a command")
-	case *parse.NumberNode:
-		return s.idealConstant(word)
-	case *parse.StringNode:
-		return reflect.ValueOf(word.Text)
-	}
-	s.errorf("can't evaluate command %q", firstWord)
-	panic("not reached")
-}
-
-// idealConstant is called to return the value of a number in a context where
-// we don't know the type. In that case, the syntax of the number tells us
-// its type, and we use Go rules to resolve.  Note there is no such thing as
-// a uint ideal constant in this situation - the value must be of int type.
-func (s *state) idealConstant(constant *parse.NumberNode) reflect.Value {
-	// These are ideal constants but we don't know the type
-	// and we have no context.  (If it was a method argument,
-	// we'd know what we need.) The syntax guides us to some extent.
-	s.at(constant)
-	switch {
-	case constant.IsComplex:
-		return reflect.ValueOf(constant.Complex128) // incontrovertible.
-	case constant.IsFloat && !isHexConstant(constant.Text) && strings.IndexAny(constant.Text, ".eE") >= 0:
-		return reflect.ValueOf(constant.Float64)
-	case constant.IsInt:
-		n := int(constant.Int64)
-		if int64(n) != constant.Int64 {
-			s.errorf("%s overflows int", constant.Text)
-		}
-		return reflect.ValueOf(n)
-	case constant.IsUint:
-		s.errorf("%s overflows int", constant.Text)
-	}
-	return zero
-}
-
-func isHexConstant(s string) bool {
-	return len(s) > 2 && s[0] == '0' && (s[1] == 'x' || s[1] == 'X')
-}
-
-func (s *state) evalFieldNode(dot reflect.Value, field *parse.FieldNode, args []parse.Node, final reflect.Value) reflect.Value {
-	s.at(field)
-	return s.evalFieldChain(dot, dot, field, field.Ident, args, final)
-}
-
-func (s *state) evalChainNode(dot reflect.Value, chain *parse.ChainNode, args []parse.Node, final reflect.Value) reflect.Value {
-	s.at(chain)
-	// (pipe).Field1.Field2 has pipe as .Node, fields as .Field. Eval the pipeline, then the fields.
-	pipe := s.evalArg(dot, nil, chain.Node)
-	if len(chain.Field) == 0 {
-		s.errorf("internal error: no fields in evalChainNode")
-	}
-	return s.evalFieldChain(dot, pipe, chain, chain.Field, args, final)
-}
-
-func (s *state) evalVariableNode(dot reflect.Value, variable *parse.VariableNode, args []parse.Node, final reflect.Value) reflect.Value {
-	// $x.Field has $x as the first ident, Field as the second. Eval the var, then the fields.
-	s.at(variable)
-	value := s.varValue(variable.Ident[0])
-	if len(variable.Ident) == 1 {
-		s.notAFunction(args, final)
-		return value
-	}
-	return s.evalFieldChain(dot, value, variable, variable.Ident[1:], args, final)
-}
-
-// evalFieldChain evaluates .X.Y.Z possibly followed by arguments.
-// dot is the environment in which to evaluate arguments, while
-// receiver is the value being walked along the chain.
-func (s *state) evalFieldChain(dot, receiver reflect.Value, node parse.Node, ident []string, args []parse.Node, final reflect.Value) reflect.Value {
-	n := len(ident)
-	for i := 0; i < n-1; i++ {
-		receiver = s.evalField(dot, ident[i], node, nil, zero, receiver)
-	}
-	// Now if it's a method, it gets the arguments.
-	return s.evalField(dot, ident[n-1], node, args, final, receiver)
-}
-
-func (s *state) evalFunction(dot reflect.Value, node *parse.IdentifierNode, cmd parse.Node, args []parse.Node, final reflect.Value) reflect.Value {
-	s.at(node)
-	name := node.Ident
-	function, ok := findFunction(name, s.tmpl)
-	if !ok {
-		s.errorf("%q is not a defined function", name)
-	}
-	return s.evalCall(dot, function, cmd, name, args, final)
-}
-
-// evalField evaluates an expression like (.Field) or (.Field arg1 arg2).
-// The 'final' argument represents the return value from the preceding
-// value of the pipeline, if any.
-func (s *state) evalField(dot reflect.Value, fieldName string, node parse.Node, args []parse.Node, final, receiver reflect.Value) reflect.Value {
-	if !receiver.IsValid() {
-		return zero
-	}
-	typ := receiver.Type()
-	receiver, _ = indirect(receiver)
-	// Unless it's an interface, need to get to a value of type *T to guarantee
-	// we see all methods of T and *T.
-	ptr := receiver
-	if ptr.Kind() != reflect.Interface && ptr.CanAddr() {
-		ptr = ptr.Addr()
-	}
-	if method := ptr.MethodByName(fieldName); method.IsValid() {
-		return s.evalCall(dot, method, node, fieldName, args, final)
-	}
-	hasArgs := len(args) > 1 || final.IsValid()
-	// It's not a method; must be a field of a struct or an element of a map. The receiver must not be nil.
-	receiver, isNil := indirect(receiver)
-	if isNil {
-		s.errorf("nil pointer evaluating %s.%s", typ, fieldName)
-	}
-	switch receiver.Kind() {
-	case reflect.Struct:
-		tField, ok := receiver.Type().FieldByName(fieldName)
-		if ok {
-			field := receiver.FieldByIndex(tField.Index)
-			if tField.PkgPath != "" { // field is unexported
-				s.errorf("%s is an unexported field of struct type %s", fieldName, typ)
-			}
-			// If it's a function, we must call it.
-			if hasArgs {
-				s.errorf("%s has arguments but cannot be invoked as function", fieldName)
-			}
-			return field
-		}
-		s.errorf("%s is not a field of struct type %s", fieldName, typ)
-	case reflect.Map:
-		// If it's a map, attempt to use the field name as a key.
-		nameVal := reflect.ValueOf(fieldName)
-		if nameVal.Type().AssignableTo(receiver.Type().Key()) {
-			if hasArgs {
-				s.errorf("%s is not a method but has arguments", fieldName)
-			}
-			return receiver.MapIndex(nameVal)
-		}
-	}
-	s.errorf("can't evaluate field %s in type %s", fieldName, typ)
-	panic("not reached")
-}
-
-var (
-	errorType       = reflect.TypeOf((*error)(nil)).Elem()
-	fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
-)
-
-// evalCall executes a function or method call. If it's a method, fun already has the receiver bound, so
-// it looks just like a function call.  The arg list, if non-nil, includes (in the manner of the shell), arg[0]
-// as the function itself.
-func (s *state) evalCall(dot, fun reflect.Value, node parse.Node, name string, args []parse.Node, final reflect.Value) reflect.Value {
-	if args != nil {
-		args = args[1:] // Zeroth arg is function name/node; not passed to function.
-	}
-	typ := fun.Type()
-	numIn := len(args)
-	if final.IsValid() {
-		numIn++
-	}
-	numFixed := len(args)
-	if typ.IsVariadic() {
-		numFixed = typ.NumIn() - 1 // last arg is the variadic one.
-		if numIn < numFixed {
-			s.errorf("wrong number of args for %s: want at least %d got %d", name, typ.NumIn()-1, len(args))
-		}
-	} else if numIn < typ.NumIn()-1 || !typ.IsVariadic() && numIn != typ.NumIn() {
-		s.errorf("wrong number of args for %s: want %d got %d", name, typ.NumIn(), len(args))
-	}
-	if !goodFunc(typ) {
-		// TODO: This could still be a confusing error; maybe goodFunc should provide info.
-		s.errorf("can't call method/function %q with %d results", name, typ.NumOut())
-	}
-	// Build the arg list.
-	argv := make([]reflect.Value, numIn)
-	// Args must be evaluated. Fixed args first.
-	i := 0
-	for ; i < numFixed && i < len(args); i++ {
-		argv[i] = s.evalArg(dot, typ.In(i), args[i])
-	}
-	// Now the ... args.
-	if typ.IsVariadic() {
-		argType := typ.In(typ.NumIn() - 1).Elem() // Argument is a slice.
-		for ; i < len(args); i++ {
-			argv[i] = s.evalArg(dot, argType, args[i])
-		}
-	}
-	// Add final value if necessary.
-	if final.IsValid() {
-		t := typ.In(typ.NumIn() - 1)
-		if typ.IsVariadic() {
-			t = t.Elem()
-		}
-		argv[i] = s.validateType(final, t)
-	}
-	result := fun.Call(argv)
-	// If we have an error that is not nil, stop execution and return that error to the caller.
-	if len(result) == 2 && !result[1].IsNil() {
-		s.at(node)
-		s.errorf("error calling %s: %s", name, result[1].Interface().(error))
-	}
-	return result[0]
-}
-
-// canBeNil reports whether an untyped nil can be assigned to the type. See reflect.Zero.
-func canBeNil(typ reflect.Type) bool {
-	switch typ.Kind() {
-	case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
-		return true
-	}
-	return false
-}
-
-// validateType guarantees that the value is valid and assignable to the type.
-func (s *state) validateType(value reflect.Value, typ reflect.Type) reflect.Value {
-	if !value.IsValid() {
-		if typ == nil || canBeNil(typ) {
-			// An untyped nil interface{}. Accept as a proper nil value.
-			return reflect.Zero(typ)
-		}
-		s.errorf("invalid value; expected %s", typ)
-	}
-	if typ != nil && !value.Type().AssignableTo(typ) {
-		if value.Kind() == reflect.Interface && !value.IsNil() {
-			value = value.Elem()
-			if value.Type().AssignableTo(typ) {
-				return value
-			}
-			// fallthrough
-		}
-		// Does one dereference or indirection work? We could do more, as we
-		// do with method receivers, but that gets messy and method receivers
-		// are much more constrained, so it makes more sense there than here.
-		// Besides, one is almost always all you need.
-		switch {
-		case value.Kind() == reflect.Ptr && value.Type().Elem().AssignableTo(typ):
-			value = value.Elem()
-			if !value.IsValid() {
-				s.errorf("dereference of nil pointer of type %s", typ)
-			}
-		case reflect.PtrTo(value.Type()).AssignableTo(typ) && value.CanAddr():
-			value = value.Addr()
-		default:
-			s.errorf("wrong type for value; expected %s; got %s", typ, value.Type())
-		}
-	}
-	return value
-}
-
-func (s *state) evalArg(dot reflect.Value, typ reflect.Type, n parse.Node) reflect.Value {
-	s.at(n)
-	switch arg := n.(type) {
-	case *parse.DotNode:
-		return s.validateType(dot, typ)
-	case *parse.NilNode:
-		if canBeNil(typ) {
-			return reflect.Zero(typ)
-		}
-		s.errorf("cannot assign nil to %s", typ)
-	case *parse.FieldNode:
-		return s.validateType(s.evalFieldNode(dot, arg, []parse.Node{n}, zero), typ)
-	case *parse.VariableNode:
-		return s.validateType(s.evalVariableNode(dot, arg, nil, zero), typ)
-	case *parse.PipeNode:
-		return s.validateType(s.evalPipeline(dot, arg), typ)
-	case *parse.IdentifierNode:
-		return s.evalFunction(dot, arg, arg, nil, zero)
-	case *parse.ChainNode:
-		return s.validateType(s.evalChainNode(dot, arg, nil, zero), typ)
-	}
-	switch typ.Kind() {
-	case reflect.Bool:
-		return s.evalBool(typ, n)
-	case reflect.Complex64, reflect.Complex128:
-		return s.evalComplex(typ, n)
-	case reflect.Float32, reflect.Float64:
-		return s.evalFloat(typ, n)
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return s.evalInteger(typ, n)
-	case reflect.Interface:
-		if typ.NumMethod() == 0 {
-			return s.evalEmptyInterface(dot, n)
-		}
-	case reflect.String:
-		return s.evalString(typ, n)
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		return s.evalUnsignedInteger(typ, n)
-	}
-	s.errorf("can't handle %s for arg of type %s", n, typ)
-	panic("not reached")
-}
-
-func (s *state) evalBool(typ reflect.Type, n parse.Node) reflect.Value {
-	s.at(n)
-	if n, ok := n.(*parse.BoolNode); ok {
-		value := reflect.New(typ).Elem()
-		value.SetBool(n.True)
-		return value
-	}
-	s.errorf("expected bool; found %s", n)
-	panic("not reached")
-}
-
-func (s *state) evalString(typ reflect.Type, n parse.Node) reflect.Value {
-	s.at(n)
-	if n, ok := n.(*parse.StringNode); ok {
-		value := reflect.New(typ).Elem()
-		value.SetString(n.Text)
-		return value
-	}
-	s.errorf("expected string; found %s", n)
-	panic("not reached")
-}
-
-func (s *state) evalInteger(typ reflect.Type, n parse.Node) reflect.Value {
-	s.at(n)
-	if n, ok := n.(*parse.NumberNode); ok && n.IsInt {
-		value := reflect.New(typ).Elem()
-		value.SetInt(n.Int64)
-		return value
-	}
-	s.errorf("expected integer; found %s", n)
-	panic("not reached")
-}
-
-func (s *state) evalUnsignedInteger(typ reflect.Type, n parse.Node) reflect.Value {
-	s.at(n)
-	if n, ok := n.(*parse.NumberNode); ok && n.IsUint {
-		value := reflect.New(typ).Elem()
-		value.SetUint(n.Uint64)
-		return value
-	}
-	s.errorf("expected unsigned integer; found %s", n)
-	panic("not reached")
-}
-
-func (s *state) evalFloat(typ reflect.Type, n parse.Node) reflect.Value {
-	s.at(n)
-	if n, ok := n.(*parse.NumberNode); ok && n.IsFloat {
-		value := reflect.New(typ).Elem()
-		value.SetFloat(n.Float64)
-		return value
-	}
-	s.errorf("expected float; found %s", n)
-	panic("not reached")
-}
-
-func (s *state) evalComplex(typ reflect.Type, n parse.Node) reflect.Value {
-	if n, ok := n.(*parse.NumberNode); ok && n.IsComplex {
-		value := reflect.New(typ).Elem()
-		value.SetComplex(n.Complex128)
-		return value
-	}
-	s.errorf("expected complex; found %s", n)
-	panic("not reached")
-}
-
-func (s *state) evalEmptyInterface(dot reflect.Value, n parse.Node) reflect.Value {
-	s.at(n)
-	switch n := n.(type) {
-	case *parse.BoolNode:
-		return reflect.ValueOf(n.True)
-	case *parse.DotNode:
-		return dot
-	case *parse.FieldNode:
-		return s.evalFieldNode(dot, n, nil, zero)
-	case *parse.IdentifierNode:
-		return s.evalFunction(dot, n, n, nil, zero)
-	case *parse.NilNode:
-		// NilNode is handled in evalArg, the only place that calls here.
-		s.errorf("evalEmptyInterface: nil (can't happen)")
-	case *parse.NumberNode:
-		return s.idealConstant(n)
-	case *parse.StringNode:
-		return reflect.ValueOf(n.Text)
-	case *parse.VariableNode:
-		return s.evalVariableNode(dot, n, nil, zero)
-	case *parse.PipeNode:
-		return s.evalPipeline(dot, n)
-	}
-	s.errorf("can't handle assignment of %s to empty interface argument", n)
-	panic("not reached")
-}
-
-// indirect returns the item at the end of indirection, and a bool to indicate if it's nil.
-// We indirect through pointers and empty interfaces (only) because
-// non-empty interfaces have methods we might need.
-func indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
-	for ; v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface; v = v.Elem() {
-		if v.IsNil() {
-			return v, true
-		}
-		if v.Kind() == reflect.Interface && v.NumMethod() > 0 {
-			break
-		}
-	}
-	return v, false
-}
-
-// printValue writes the textual representation of the value to the output of
-// the template.
-func (s *state) printValue(n parse.Node, v reflect.Value) {
-	s.at(n)
-	iface, ok := printableValue(v)
-	if !ok {
-		s.errorf("can't print %s of type %s", n, v.Type())
-	}
-	fmt.Fprint(s.wr, iface)
-}
-
-// printableValue returns the, possibly indirected, interface value inside v that
-// is best for a call to formatted printer.
-func printableValue(v reflect.Value) (interface{}, bool) {
-	if v.Kind() == reflect.Ptr {
-		v, _ = indirect(v) // fmt.Fprint handles nil.
-	}
-	if !v.IsValid() {
-		return "<no value>", true
-	}
-
-	if !v.Type().Implements(errorType) && !v.Type().Implements(fmtStringerType) {
-		if v.CanAddr() && (reflect.PtrTo(v.Type()).Implements(errorType) || reflect.PtrTo(v.Type()).Implements(fmtStringerType)) {
-			v = v.Addr()
-		} else {
-			switch v.Kind() {
-			case reflect.Chan, reflect.Func:
-				return nil, false
-			}
-		}
-	}
-	return v.Interface(), true
-}
-
-// Types to help sort the keys in a map for reproducible output.
-
-type rvs []reflect.Value
-
-func (x rvs) Len() int      { return len(x) }
-func (x rvs) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
-
-type rvInts struct{ rvs }
-
-func (x rvInts) Less(i, j int) bool { return x.rvs[i].Int() < x.rvs[j].Int() }
-
-type rvUints struct{ rvs }
-
-func (x rvUints) Less(i, j int) bool { return x.rvs[i].Uint() < x.rvs[j].Uint() }
-
-type rvFloats struct{ rvs }
-
-func (x rvFloats) Less(i, j int) bool { return x.rvs[i].Float() < x.rvs[j].Float() }
-
-type rvStrings struct{ rvs }
-
-func (x rvStrings) Less(i, j int) bool { return x.rvs[i].String() < x.rvs[j].String() }
-
-// sortKeys sorts (if it can) the slice of reflect.Values, which is a slice of map keys.
-func sortKeys(v []reflect.Value) []reflect.Value {
-	if len(v) <= 1 {
-		return v
-	}
-	switch v[0].Kind() {
-	case reflect.Float32, reflect.Float64:
-		sort.Sort(rvFloats{v})
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		sort.Sort(rvInts{v})
-	case reflect.String:
-		sort.Sort(rvStrings{v})
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		sort.Sort(rvUints{v})
-	}
-	return v
-}

vendor/github.com/alecthomas/template/funcs.go

@@ -1,598 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package template
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"net/url"
-	"reflect"
-	"strings"
-	"unicode"
-	"unicode/utf8"
-)
-
-// FuncMap is the type of the map defining the mapping from names to functions.
-// Each function must have either a single return value, or two return values of
-// which the second has type error. In that case, if the second (error)
-// return value evaluates to non-nil during execution, execution terminates and
-// Execute returns that error.
-type FuncMap map[string]interface{}
-
-var builtins = FuncMap{
-	"and":      and,
-	"call":     call,
-	"html":     HTMLEscaper,
-	"index":    index,
-	"js":       JSEscaper,
-	"len":      length,
-	"not":      not,
-	"or":       or,
-	"print":    fmt.Sprint,
-	"printf":   fmt.Sprintf,
-	"println":  fmt.Sprintln,
-	"urlquery": URLQueryEscaper,
-
-	// Comparisons
-	"eq": eq, // ==
-	"ge": ge, // >=
-	"gt": gt, // >
-	"le": le, // <=
-	"lt": lt, // <
-	"ne": ne, // !=
-}
-
-var builtinFuncs = createValueFuncs(builtins)
-
-// createValueFuncs turns a FuncMap into a map[string]reflect.Value
-func createValueFuncs(funcMap FuncMap) map[string]reflect.Value {
-	m := make(map[string]reflect.Value)
-	addValueFuncs(m, funcMap)
-	return m
-}
-
-// addValueFuncs adds to values the functions in funcs, converting them to reflect.Values.
-func addValueFuncs(out map[string]reflect.Value, in FuncMap) {
-	for name, fn := range in {
-		v := reflect.ValueOf(fn)
-		if v.Kind() != reflect.Func {
-			panic("value for " + name + " not a function")
-		}
-		if !goodFunc(v.Type()) {
-			panic(fmt.Errorf("can't install method/function %q with %d results", name, v.Type().NumOut()))
-		}
-		out[name] = v
-	}
-}
-
-// addFuncs adds to values the functions in funcs. It does no checking of the input -
-// call addValueFuncs first.
-func addFuncs(out, in FuncMap) {
-	for name, fn := range in {
-		out[name] = fn
-	}
-}
-
-// goodFunc checks that the function or method has the right result signature.
-func goodFunc(typ reflect.Type) bool {
-	// We allow functions with 1 result or 2 results where the second is an error.
-	switch {
-	case typ.NumOut() == 1:
-		return true
-	case typ.NumOut() == 2 && typ.Out(1) == errorType:
-		return true
-	}
-	return false
-}
-
-// findFunction looks for a function in the template, and global map.
-func findFunction(name string, tmpl *Template) (reflect.Value, bool) {
-	if tmpl != nil && tmpl.common != nil {
-		if fn := tmpl.execFuncs[name]; fn.IsValid() {
-			return fn, true
-		}
-	}
-	if fn := builtinFuncs[name]; fn.IsValid() {
-		return fn, true
-	}
-	return reflect.Value{}, false
-}
-
-// Indexing.
-
-// index returns the result of indexing its first argument by the following
-// arguments.  Thus "index x 1 2 3" is, in Go syntax, x[1][2][3]. Each
-// indexed item must be a map, slice, or array.
-func index(item interface{}, indices ...interface{}) (interface{}, error) {
-	v := reflect.ValueOf(item)
-	for _, i := range indices {
-		index := reflect.ValueOf(i)
-		var isNil bool
-		if v, isNil = indirect(v); isNil {
-			return nil, fmt.Errorf("index of nil pointer")
-		}
-		switch v.Kind() {
-		case reflect.Array, reflect.Slice, reflect.String:
-			var x int64
-			switch index.Kind() {
-			case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-				x = index.Int()
-			case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-				x = int64(index.Uint())
-			default:
-				return nil, fmt.Errorf("cannot index slice/array with type %s", index.Type())
-			}
-			if x < 0 || x >= int64(v.Len()) {
-				return nil, fmt.Errorf("index out of range: %d", x)
-			}
-			v = v.Index(int(x))
-		case reflect.Map:
-			if !index.IsValid() {
-				index = reflect.Zero(v.Type().Key())
-			}
-			if !index.Type().AssignableTo(v.Type().Key()) {
-				return nil, fmt.Errorf("%s is not index type for %s", index.Type(), v.Type())
-			}
-			if x := v.MapIndex(index); x.IsValid() {
-				v = x
-			} else {
-				v = reflect.Zero(v.Type().Elem())
-			}
-		default:
-			return nil, fmt.Errorf("can't index item of type %s", v.Type())
-		}
-	}
-	return v.Interface(), nil
-}
-
-// Length
-
-// length returns the length of the item, with an error if it has no defined length.
-func length(item interface{}) (int, error) {
-	v, isNil := indirect(reflect.ValueOf(item))
-	if isNil {
-		return 0, fmt.Errorf("len of nil pointer")
-	}
-	switch v.Kind() {
-	case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String:
-		return v.Len(), nil
-	}
-	return 0, fmt.Errorf("len of type %s", v.Type())
-}
-
-// Function invocation
-
-// call returns the result of evaluating the first argument as a function.
-// The function must return 1 result, or 2 results, the second of which is an error.
-func call(fn interface{}, args ...interface{}) (interface{}, error) {
-	v := reflect.ValueOf(fn)
-	typ := v.Type()
-	if typ.Kind() != reflect.Func {
-		return nil, fmt.Errorf("non-function of type %s", typ)
-	}
-	if !goodFunc(typ) {
-		return nil, fmt.Errorf("function called with %d args; should be 1 or 2", typ.NumOut())
-	}
-	numIn := typ.NumIn()
-	var dddType reflect.Type
-	if typ.IsVariadic() {
-		if len(args) < numIn-1 {
-			return nil, fmt.Errorf("wrong number of args: got %d want at least %d", len(args), numIn-1)
-		}
-		dddType = typ.In(numIn - 1).Elem()
-	} else {
-		if len(args) != numIn {
-			return nil, fmt.Errorf("wrong number of args: got %d want %d", len(args), numIn)
-		}
-	}
-	argv := make([]reflect.Value, len(args))
-	for i, arg := range args {
-		value := reflect.ValueOf(arg)
-		// Compute the expected type. Clumsy because of variadics.
-		var argType reflect.Type
-		if !typ.IsVariadic() || i < numIn-1 {
-			argType = typ.In(i)
-		} else {
-			argType = dddType
-		}
-		if !value.IsValid() && canBeNil(argType) {
-			value = reflect.Zero(argType)
-		}
-		if !value.Type().AssignableTo(argType) {
-			return nil, fmt.Errorf("arg %d has type %s; should be %s", i, value.Type(), argType)
-		}
-		argv[i] = value
-	}
-	result := v.Call(argv)
-	if len(result) == 2 && !result[1].IsNil() {
-		return result[0].Interface(), result[1].Interface().(error)
-	}
-	return result[0].Interface(), nil
-}
-
-// Boolean logic.
-
-func truth(a interface{}) bool {
-	t, _ := isTrue(reflect.ValueOf(a))
-	return t
-}
-
-// and computes the Boolean AND of its arguments, returning
-// the first false argument it encounters, or the last argument.
-func and(arg0 interface{}, args ...interface{}) interface{} {
-	if !truth(arg0) {
-		return arg0
-	}
-	for i := range args {
-		arg0 = args[i]
-		if !truth(arg0) {
-			break
-		}
-	}
-	return arg0
-}
-
-// or computes the Boolean OR of its arguments, returning
-// the first true argument it encounters, or the last argument.
-func or(arg0 interface{}, args ...interface{}) interface{} {
-	if truth(arg0) {
-		return arg0
-	}
-	for i := range args {
-		arg0 = args[i]
-		if truth(arg0) {
-			break
-		}
-	}
-	return arg0
-}
-
-// not returns the Boolean negation of its argument.
-func not(arg interface{}) (truth bool) {
-	truth, _ = isTrue(reflect.ValueOf(arg))
-	return !truth
-}
-
-// Comparison.
-
-// TODO: Perhaps allow comparison between signed and unsigned integers.
-
-var (
-	errBadComparisonType = errors.New("invalid type for comparison")
-	errBadComparison     = errors.New("incompatible types for comparison")
-	errNoComparison      = errors.New("missing argument for comparison")
-)
-
-type kind int
-
-const (
-	invalidKind kind = iota
-	boolKind
-	complexKind
-	intKind
-	floatKind
-	integerKind
-	stringKind
-	uintKind
-)
-
-func basicKind(v reflect.Value) (kind, error) {
-	switch v.Kind() {
-	case reflect.Bool:
-		return boolKind, nil
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return intKind, nil
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		return uintKind, nil
-	case reflect.Float32, reflect.Float64:
-		return floatKind, nil
-	case reflect.Complex64, reflect.Complex128:
-		return complexKind, nil
-	case reflect.String:
-		return stringKind, nil
-	}
-	return invalidKind, errBadComparisonType
-}
-
-// eq evaluates the comparison a == b || a == c || ...
-func eq(arg1 interface{}, arg2 ...interface{}) (bool, error) {
-	v1 := reflect.ValueOf(arg1)
-	k1, err := basicKind(v1)
-	if err != nil {
-		return false, err
-	}
-	if len(arg2) == 0 {
-		return false, errNoComparison
-	}
-	for _, arg := range arg2 {
-		v2 := reflect.ValueOf(arg)
-		k2, err := basicKind(v2)
-		if err != nil {
-			return false, err
-		}
-		truth := false
-		if k1 != k2 {
-			// Special case: Can compare integer values regardless of type's sign.
-			switch {
-			case k1 == intKind && k2 == uintKind:
-				truth = v1.Int() >= 0 && uint64(v1.Int()) == v2.Uint()
-			case k1 == uintKind && k2 == intKind:
-				truth = v2.Int() >= 0 && v1.Uint() == uint64(v2.Int())
-			default:
-				return false, errBadComparison
-			}
-		} else {
-			switch k1 {
-			case boolKind:
-				truth = v1.Bool() == v2.Bool()
-			case complexKind:
-				truth = v1.Complex() == v2.Complex()
-			case floatKind:
-				truth = v1.Float() == v2.Float()
-			case intKind:
-				truth = v1.Int() == v2.Int()
-			case stringKind:
-				truth = v1.String() == v2.String()
-			case uintKind:
-				truth = v1.Uint() == v2.Uint()
-			default:
-				panic("invalid kind")
-			}
-		}
-		if truth {
-			return true, nil
-		}
-	}
-	return false, nil
-}
-
-// ne evaluates the comparison a != b.
-func ne(arg1, arg2 interface{}) (bool, error) {
-	// != is the inverse of ==.
-	equal, err := eq(arg1, arg2)
-	return !equal, err
-}
-
-// lt evaluates the comparison a < b.
-func lt(arg1, arg2 interface{}) (bool, error) {
-	v1 := reflect.ValueOf(arg1)
-	k1, err := basicKind(v1)
-	if err != nil {
-		return false, err
-	}
-	v2 := reflect.ValueOf(arg2)
-	k2, err := basicKind(v2)
-	if err != nil {
-		return false, err
-	}
-	truth := false
-	if k1 != k2 {
-		// Special case: Can compare integer values regardless of type's sign.
-		switch {
-		case k1 == intKind && k2 == uintKind:
-			truth = v1.Int() < 0 || uint64(v1.Int()) < v2.Uint()
-		case k1 == uintKind && k2 == intKind:
-			truth = v2.Int() >= 0 && v1.Uint() < uint64(v2.Int())
-		default:
-			return false, errBadComparison
-		}
-	} else {
-		switch k1 {
-		case boolKind, complexKind:
-			return false, errBadComparisonType
-		case floatKind:
-			truth = v1.Float() < v2.Float()
-		case intKind:
-			truth = v1.Int() < v2.Int()
-		case stringKind:
-			truth = v1.String() < v2.String()
-		case uintKind:
-			truth = v1.Uint() < v2.Uint()
-		default:
-			panic("invalid kind")
-		}
-	}
-	return truth, nil
-}
-
-// le evaluates the comparison <= b.
-func le(arg1, arg2 interface{}) (bool, error) {
-	// <= is < or ==.
-	lessThan, err := lt(arg1, arg2)
-	if lessThan || err != nil {
-		return lessThan, err
-	}
-	return eq(arg1, arg2)
-}
-
-// gt evaluates the comparison a > b.
-func gt(arg1, arg2 interface{}) (bool, error) {
-	// > is the inverse of <=.
-	lessOrEqual, err := le(arg1, arg2)
-	if err != nil {
-		return false, err
-	}
-	return !lessOrEqual, nil
-}
-
-// ge evaluates the comparison a >= b.
-func ge(arg1, arg2 interface{}) (bool, error) {
-	// >= is the inverse of <.
-	lessThan, err := lt(arg1, arg2)
-	if err != nil {
-		return false, err
-	}
-	return !lessThan, nil
-}
-
-// HTML escaping.
-
-var (
-	htmlQuot = []byte("&#34;") // shorter than "&quot;"
-	htmlApos = []byte("&#39;") // shorter than "&apos;" and apos was not in HTML until HTML5
-	htmlAmp  = []byte("&amp;")
-	htmlLt   = []byte("&lt;")
-	htmlGt   = []byte("&gt;")
-)
-
-// HTMLEscape writes to w the escaped HTML equivalent of the plain text data b.
-func HTMLEscape(w io.Writer, b []byte) {
-	last := 0
-	for i, c := range b {
-		var html []byte
-		switch c {
-		case '"':
-			html = htmlQuot
-		case '\'':
-			html = htmlApos
-		case '&':
-			html = htmlAmp
-		case '<':
-			html = htmlLt
-		case '>':
-			html = htmlGt
-		default:
-			continue
-		}
-		w.Write(b[last:i])
-		w.Write(html)
-		last = i + 1
-	}
-	w.Write(b[last:])
-}
-
-// HTMLEscapeString returns the escaped HTML equivalent of the plain text data s.
-func HTMLEscapeString(s string) string {
-	// Avoid allocation if we can.
-	if strings.IndexAny(s, `'"&<>`) < 0 {
-		return s
-	}
-	var b bytes.Buffer
-	HTMLEscape(&b, []byte(s))
-	return b.String()
-}
-
-// HTMLEscaper returns the escaped HTML equivalent of the textual
-// representation of its arguments.
-func HTMLEscaper(args ...interface{}) string {
-	return HTMLEscapeString(evalArgs(args))
-}
-
-// JavaScript escaping.
-
-var (
-	jsLowUni = []byte(`\u00`)
-	hex      = []byte("0123456789ABCDEF")
-
-	jsBackslash = []byte(`\\`)
-	jsApos      = []byte(`\'`)
-	jsQuot      = []byte(`\"`)
-	jsLt        = []byte(`\x3C`)
-	jsGt        = []byte(`\x3E`)
-)
-
-// JSEscape writes to w the escaped JavaScript equivalent of the plain text data b.
-func JSEscape(w io.Writer, b []byte) {
-	last := 0
-	for i := 0; i < len(b); i++ {
-		c := b[i]
-
-		if !jsIsSpecial(rune(c)) {
-			// fast path: nothing to do
-			continue
-		}
-		w.Write(b[last:i])
-
-		if c < utf8.RuneSelf {
-			// Quotes, slashes and angle brackets get quoted.
-			// Control characters get written as \u00XX.
-			switch c {
-			case '\\':
-				w.Write(jsBackslash)
-			case '\'':
-				w.Write(jsApos)
-			case '"':
-				w.Write(jsQuot)
-			case '<':
-				w.Write(jsLt)
-			case '>':
-				w.Write(jsGt)
-			default:
-				w.Write(jsLowUni)
-				t, b := c>>4, c&0x0f
-				w.Write(hex[t : t+1])
-				w.Write(hex[b : b+1])
-			}
-		} else {
-			// Unicode rune.
-			r, size := utf8.DecodeRune(b[i:])
-			if unicode.IsPrint(r) {
-				w.Write(b[i : i+size])
-			} else {
-				fmt.Fprintf(w, "\\u%04X", r)
-			}
-			i += size - 1
-		}
-		last = i + 1
-	}
-	w.Write(b[last:])
-}
-
-// JSEscapeString returns the escaped JavaScript equivalent of the plain text data s.
-func JSEscapeString(s string) string {
-	// Avoid allocation if we can.
-	if strings.IndexFunc(s, jsIsSpecial) < 0 {
-		return s
-	}
-	var b bytes.Buffer
-	JSEscape(&b, []byte(s))
-	return b.String()
-}
-
-func jsIsSpecial(r rune) bool {
-	switch r {
-	case '\\', '\'', '"', '<', '>':
-		return true
-	}
-	return r < ' ' || utf8.RuneSelf <= r
-}
-
-// JSEscaper returns the escaped JavaScript equivalent of the textual
-// representation of its arguments.
-func JSEscaper(args ...interface{}) string {
-	return JSEscapeString(evalArgs(args))
-}
-
-// URLQueryEscaper returns the escaped value of the textual representation of
-// its arguments in a form suitable for embedding in a URL query.
-func URLQueryEscaper(args ...interface{}) string {
-	return url.QueryEscape(evalArgs(args))
-}
-
-// evalArgs formats the list of arguments into a string. It is therefore equivalent to
-//	fmt.Sprint(args...)
-// except that each argument is indirected (if a pointer), as required,
-// using the same rules as the default string evaluation during template
-// execution.
-func evalArgs(args []interface{}) string {
-	ok := false
-	var s string
-	// Fast path for simple common case.
-	if len(args) == 1 {
-		s, ok = args[0].(string)
-	}
-	if !ok {
-		for i, arg := range args {
-			a, ok := printableValue(reflect.ValueOf(arg))
-			if ok {
-				args[i] = a
-			} // else left fmt do its thing
-		}
-		s = fmt.Sprint(args...)
-	}
-	return s
-}

vendor/github.com/alecthomas/template/helper.go

@@ -1,108 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Helper functions to make constructing templates easier.
-
-package template
-
-import (
-	"fmt"
-	"io/ioutil"
-	"path/filepath"
-)
-
-// Functions and methods to parse templates.
-
-// Must is a helper that wraps a call to a function returning (*Template, error)
-// and panics if the error is non-nil. It is intended for use in variable
-// initializations such as
-//	var t = template.Must(template.New("name").Parse("text"))
-func Must(t *Template, err error) *Template {
-	if err != nil {
-		panic(err)
-	}
-	return t
-}
-
-// ParseFiles creates a new Template and parses the template definitions from
-// the named files. The returned template's name will have the (base) name and
-// (parsed) contents of the first file. There must be at least one file.
-// If an error occurs, parsing stops and the returned *Template is nil.
-func ParseFiles(filenames ...string) (*Template, error) {
-	return parseFiles(nil, filenames...)
-}
-
-// ParseFiles parses the named files and associates the resulting templates with
-// t. If an error occurs, parsing stops and the returned template is nil;
-// otherwise it is t. There must be at least one file.
-func (t *Template) ParseFiles(filenames ...string) (*Template, error) {
-	return parseFiles(t, filenames...)
-}
-
-// parseFiles is the helper for the method and function. If the argument
-// template is nil, it is created from the first file.
-func parseFiles(t *Template, filenames ...string) (*Template, error) {
-	if len(filenames) == 0 {
-		// Not really a problem, but be consistent.
-		return nil, fmt.Errorf("template: no files named in call to ParseFiles")
-	}
-	for _, filename := range filenames {
-		b, err := ioutil.ReadFile(filename)
-		if err != nil {
-			return nil, err
-		}
-		s := string(b)
-		name := filepath.Base(filename)
-		// First template becomes return value if not already defined,
-		// and we use that one for subsequent New calls to associate
-		// all the templates together. Also, if this file has the same name
-		// as t, this file becomes the contents of t, so
-		//  t, err := New(name).Funcs(xxx).ParseFiles(name)
-		// works. Otherwise we create a new template associated with t.
-		var tmpl *Template
-		if t == nil {
-			t = New(name)
-		}
-		if name == t.Name() {
-			tmpl = t
-		} else {
-			tmpl = t.New(name)
-		}
-		_, err = tmpl.Parse(s)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return t, nil
-}
-
-// ParseGlob creates a new Template and parses the template definitions from the
-// files identified by the pattern, which must match at least one file. The
-// returned template will have the (base) name and (parsed) contents of the
-// first file matched by the pattern. ParseGlob is equivalent to calling
-// ParseFiles with the list of files matched by the pattern.
-func ParseGlob(pattern string) (*Template, error) {
-	return parseGlob(nil, pattern)
-}
-
-// ParseGlob parses the template definitions in the files identified by the
-// pattern and associates the resulting templates with t. The pattern is
-// processed by filepath.Glob and must match at least one file. ParseGlob is
-// equivalent to calling t.ParseFiles with the list of files matched by the
-// pattern.
-func (t *Template) ParseGlob(pattern string) (*Template, error) {
-	return parseGlob(t, pattern)
-}
-
-// parseGlob is the implementation of the function and method ParseGlob.
-func parseGlob(t *Template, pattern string) (*Template, error) {
-	filenames, err := filepath.Glob(pattern)
-	if err != nil {
-		return nil, err
-	}
-	if len(filenames) == 0 {
-		return nil, fmt.Errorf("template: pattern matches no files: %#q", pattern)
-	}
-	return parseFiles(t, filenames...)
-}

vendor/github.com/alecthomas/template/parse/lex.go

@@ -1,556 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package parse
-
-import (
-	"fmt"
-	"strings"
-	"unicode"
-	"unicode/utf8"
-)
-
-// item represents a token or text string returned from the scanner.
-type item struct {
-	typ itemType // The type of this item.
-	pos Pos      // The starting position, in bytes, of this item in the input string.
-	val string   // The value of this item.
-}
-
-func (i item) String() string {
-	switch {
-	case i.typ == itemEOF:
-		return "EOF"
-	case i.typ == itemError:
-		return i.val
-	case i.typ > itemKeyword:
-		return fmt.Sprintf("<%s>", i.val)
-	case len(i.val) > 10:
-		return fmt.Sprintf("%.10q...", i.val)
-	}
-	return fmt.Sprintf("%q", i.val)
-}
-
-// itemType identifies the type of lex items.
-type itemType int
-
-const (
-	itemError        itemType = iota // error occurred; value is text of error
-	itemBool                         // boolean constant
-	itemChar                         // printable ASCII character; grab bag for comma etc.
-	itemCharConstant                 // character constant
-	itemComplex                      // complex constant (1+2i); imaginary is just a number
-	itemColonEquals                  // colon-equals (':=') introducing a declaration
-	itemEOF
-	itemField        // alphanumeric identifier starting with '.'
-	itemIdentifier   // alphanumeric identifier not starting with '.'
-	itemLeftDelim    // left action delimiter
-	itemLeftParen    // '(' inside action
-	itemNumber       // simple number, including imaginary
-	itemPipe         // pipe symbol
-	itemRawString    // raw quoted string (includes quotes)
-	itemRightDelim   // right action delimiter
-	itemElideNewline // elide newline after right delim
-	itemRightParen   // ')' inside action
-	itemSpace        // run of spaces separating arguments
-	itemString       // quoted string (includes quotes)
-	itemText         // plain text
-	itemVariable     // variable starting with '$', such as '$' or  '$1' or '$hello'
-	// Keywords appear after all the rest.
-	itemKeyword  // used only to delimit the keywords
-	itemDot      // the cursor, spelled '.'
-	itemDefine   // define keyword
-	itemElse     // else keyword
-	itemEnd      // end keyword
-	itemIf       // if keyword
-	itemNil      // the untyped nil constant, easiest to treat as a keyword
-	itemRange    // range keyword
-	itemTemplate // template keyword
-	itemWith     // with keyword
-)
-
-var key = map[string]itemType{
-	".":        itemDot,
-	"define":   itemDefine,
-	"else":     itemElse,
-	"end":      itemEnd,
-	"if":       itemIf,
-	"range":    itemRange,
-	"nil":      itemNil,
-	"template": itemTemplate,
-	"with":     itemWith,
-}
-
-const eof = -1
-
-// stateFn represents the state of the scanner as a function that returns the next state.
-type stateFn func(*lexer) stateFn
-
-// lexer holds the state of the scanner.
-type lexer struct {
-	name       string    // the name of the input; used only for error reports
-	input      string    // the string being scanned
-	leftDelim  string    // start of action
-	rightDelim string    // end of action
-	state      stateFn   // the next lexing function to enter
-	pos        Pos       // current position in the input
-	start      Pos       // start position of this item
-	width      Pos       // width of last rune read from input
-	lastPos    Pos       // position of most recent item returned by nextItem
-	items      chan item // channel of scanned items
-	parenDepth int       // nesting depth of ( ) exprs
-}
-
-// next returns the next rune in the input.
-func (l *lexer) next() rune {
-	if int(l.pos) >= len(l.input) {
-		l.width = 0
-		return eof
-	}
-	r, w := utf8.DecodeRuneInString(l.input[l.pos:])
-	l.width = Pos(w)
-	l.pos += l.width
-	return r
-}
-
-// peek returns but does not consume the next rune in the input.
-func (l *lexer) peek() rune {
-	r := l.next()
-	l.backup()
-	return r
-}
-
-// backup steps back one rune. Can only be called once per call of next.
-func (l *lexer) backup() {
-	l.pos -= l.width
-}
-
-// emit passes an item back to the client.
-func (l *lexer) emit(t itemType) {
-	l.items <- item{t, l.start, l.input[l.start:l.pos]}
-	l.start = l.pos
-}
-
-// ignore skips over the pending input before this point.
-func (l *lexer) ignore() {
-	l.start = l.pos
-}
-
-// accept consumes the next rune if it's from the valid set.
-func (l *lexer) accept(valid string) bool {
-	if strings.IndexRune(valid, l.next()) >= 0 {
-		return true
-	}
-	l.backup()
-	return false
-}
-
-// acceptRun consumes a run of runes from the valid set.
-func (l *lexer) acceptRun(valid string) {
-	for strings.IndexRune(valid, l.next()) >= 0 {
-	}
-	l.backup()
-}
-
-// lineNumber reports which line we're on, based on the position of
-// the previous item returned by nextItem. Doing it this way
-// means we don't have to worry about peek double counting.
-func (l *lexer) lineNumber() int {
-	return 1 + strings.Count(l.input[:l.lastPos], "\n")
-}
-
-// errorf returns an error token and terminates the scan by passing
-// back a nil pointer that will be the next state, terminating l.nextItem.
-func (l *lexer) errorf(format string, args ...interface{}) stateFn {
-	l.items <- item{itemError, l.start, fmt.Sprintf(format, args...)}
-	return nil
-}
-
-// nextItem returns the next item from the input.
-func (l *lexer) nextItem() item {
-	item := <-l.items
-	l.lastPos = item.pos
-	return item
-}
-
-// lex creates a new scanner for the input string.
-func lex(name, input, left, right string) *lexer {
-	if left == "" {
-		left = leftDelim
-	}
-	if right == "" {
-		right = rightDelim
-	}
-	l := &lexer{
-		name:       name,
-		input:      input,
-		leftDelim:  left,
-		rightDelim: right,
-		items:      make(chan item),
-	}
-	go l.run()
-	return l
-}
-
-// run runs the state machine for the lexer.
-func (l *lexer) run() {
-	for l.state = lexText; l.state != nil; {
-		l.state = l.state(l)
-	}
-}
-
-// state functions
-
-const (
-	leftDelim    = "{{"
-	rightDelim   = "}}"
-	leftComment  = "/*"
-	rightComment = "*/"
-)
-
-// lexText scans until an opening action delimiter, "{{".
-func lexText(l *lexer) stateFn {
-	for {
-		if strings.HasPrefix(l.input[l.pos:], l.leftDelim) {
-			if l.pos > l.start {
-				l.emit(itemText)
-			}
-			return lexLeftDelim
-		}
-		if l.next() == eof {
-			break
-		}
-	}
-	// Correctly reached EOF.
-	if l.pos > l.start {
-		l.emit(itemText)
-	}
-	l.emit(itemEOF)
-	return nil
-}
-
-// lexLeftDelim scans the left delimiter, which is known to be present.
-func lexLeftDelim(l *lexer) stateFn {
-	l.pos += Pos(len(l.leftDelim))
-	if strings.HasPrefix(l.input[l.pos:], leftComment) {
-		return lexComment
-	}
-	l.emit(itemLeftDelim)
-	l.parenDepth = 0
-	return lexInsideAction
-}
-
-// lexComment scans a comment. The left comment marker is known to be present.
-func lexComment(l *lexer) stateFn {
-	l.pos += Pos(len(leftComment))
-	i := strings.Index(l.input[l.pos:], rightComment)
-	if i < 0 {
-		return l.errorf("unclosed comment")
-	}
-	l.pos += Pos(i + len(rightComment))
-	if !strings.HasPrefix(l.input[l.pos:], l.rightDelim) {
-		return l.errorf("comment ends before closing delimiter")
-
-	}
-	l.pos += Pos(len(l.rightDelim))
-	l.ignore()
-	return lexText
-}
-
-// lexRightDelim scans the right delimiter, which is known to be present.
-func lexRightDelim(l *lexer) stateFn {
-	l.pos += Pos(len(l.rightDelim))
-	l.emit(itemRightDelim)
-	if l.peek() == '\\' {
-		l.pos++
-		l.emit(itemElideNewline)
-	}
-	return lexText
-}
-
-// lexInsideAction scans the elements inside action delimiters.
-func lexInsideAction(l *lexer) stateFn {
-	// Either number, quoted string, or identifier.
-	// Spaces separate arguments; runs of spaces turn into itemSpace.
-	// Pipe symbols separate and are emitted.
-	if strings.HasPrefix(l.input[l.pos:], l.rightDelim+"\\") || strings.HasPrefix(l.input[l.pos:], l.rightDelim) {
-		if l.parenDepth == 0 {
-			return lexRightDelim
-		}
-		return l.errorf("unclosed left paren")
-	}
-	switch r := l.next(); {
-	case r == eof || isEndOfLine(r):
-		return l.errorf("unclosed action")
-	case isSpace(r):
-		return lexSpace
-	case r == ':':
-		if l.next() != '=' {
-			return l.errorf("expected :=")
-		}
-		l.emit(itemColonEquals)
-	case r == '|':
-		l.emit(itemPipe)
-	case r == '"':
-		return lexQuote
-	case r == '`':
-		return lexRawQuote
-	case r == '$':
-		return lexVariable
-	case r == '\'':
-		return lexChar
-	case r == '.':
-		// special look-ahead for ".field" so we don't break l.backup().
-		if l.pos < Pos(len(l.input)) {
-			r := l.input[l.pos]
-			if r < '0' || '9' < r {
-				return lexField
-			}
-		}
-		fallthrough // '.' can start a number.
-	case r == '+' || r == '-' || ('0' <= r && r <= '9'):
-		l.backup()
-		return lexNumber
-	case isAlphaNumeric(r):
-		l.backup()
-		return lexIdentifier
-	case r == '(':
-		l.emit(itemLeftParen)
-		l.parenDepth++
-		return lexInsideAction
-	case r == ')':
-		l.emit(itemRightParen)
-		l.parenDepth--
-		if l.parenDepth < 0 {
-			return l.errorf("unexpected right paren %#U", r)
-		}
-		return lexInsideAction
-	case r <= unicode.MaxASCII && unicode.IsPrint(r):
-		l.emit(itemChar)
-		return lexInsideAction
-	default:
-		return l.errorf("unrecognized character in action: %#U", r)
-	}
-	return lexInsideAction
-}
-
-// lexSpace scans a run of space characters.
-// One space has already been seen.
-func lexSpace(l *lexer) stateFn {
-	for isSpace(l.peek()) {
-		l.next()
-	}
-	l.emit(itemSpace)
-	return lexInsideAction
-}
-
-// lexIdentifier scans an alphanumeric.
-func lexIdentifier(l *lexer) stateFn {
-Loop:
-	for {
-		switch r := l.next(); {
-		case isAlphaNumeric(r):
-			// absorb.
-		default:
-			l.backup()
-			word := l.input[l.start:l.pos]
-			if !l.atTerminator() {
-				return l.errorf("bad character %#U", r)
-			}
-			switch {
-			case key[word] > itemKeyword:
-				l.emit(key[word])
-			case word[0] == '.':
-				l.emit(itemField)
-			case word == "true", word == "false":
-				l.emit(itemBool)
-			default:
-				l.emit(itemIdentifier)
-			}
-			break Loop
-		}
-	}
-	return lexInsideAction
-}
-
-// lexField scans a field: .Alphanumeric.
-// The . has been scanned.
-func lexField(l *lexer) stateFn {
-	return lexFieldOrVariable(l, itemField)
-}
-
-// lexVariable scans a Variable: $Alphanumeric.
-// The $ has been scanned.
-func lexVariable(l *lexer) stateFn {
-	if l.atTerminator() { // Nothing interesting follows -> "$".
-		l.emit(itemVariable)
-		return lexInsideAction
-	}
-	return lexFieldOrVariable(l, itemVariable)
-}
-
-// lexVariable scans a field or variable: [.$]Alphanumeric.
-// The . or $ has been scanned.
-func lexFieldOrVariable(l *lexer, typ itemType) stateFn {
-	if l.atTerminator() { // Nothing interesting follows -> "." or "$".
-		if typ == itemVariable {
-			l.emit(itemVariable)
-		} else {
-			l.emit(itemDot)
-		}
-		return lexInsideAction
-	}
-	var r rune
-	for {
-		r = l.next()
-		if !isAlphaNumeric(r) {
-			l.backup()
-			break
-		}
-	}
-	if !l.atTerminator() {
-		return l.errorf("bad character %#U", r)
-	}
-	l.emit(typ)
-	return lexInsideAction
-}
-
-// atTerminator reports whether the input is at valid termination character to
-// appear after an identifier. Breaks .X.Y into two pieces. Also catches cases
-// like "$x+2" not being acceptable without a space, in case we decide one
-// day to implement arithmetic.
-func (l *lexer) atTerminator() bool {
-	r := l.peek()
-	if isSpace(r) || isEndOfLine(r) {
-		return true
-	}
-	switch r {
-	case eof, '.', ',', '|', ':', ')', '(':
-		return true
-	}
-	// Does r start the delimiter? This can be ambiguous (with delim=="//", $x/2 will
-	// succeed but should fail) but only in extremely rare cases caused by willfully
-	// bad choice of delimiter.
-	if rd, _ := utf8.DecodeRuneInString(l.rightDelim); rd == r {
-		return true
-	}
-	return false
-}
-
-// lexChar scans a character constant. The initial quote is already
-// scanned. Syntax checking is done by the parser.
-func lexChar(l *lexer) stateFn {
-Loop:
-	for {
-		switch l.next() {
-		case '\\':
-			if r := l.next(); r != eof && r != '\n' {
-				break
-			}
-			fallthrough
-		case eof, '\n':
-			return l.errorf("unterminated character constant")
-		case '\'':
-			break Loop
-		}
-	}
-	l.emit(itemCharConstant)
-	return lexInsideAction
-}
-
-// lexNumber scans a number: decimal, octal, hex, float, or imaginary. This
-// isn't a perfect number scanner - for instance it accepts "." and "0x0.2"
-// and "089" - but when it's wrong the input is invalid and the parser (via
-// strconv) will notice.
-func lexNumber(l *lexer) stateFn {
-	if !l.scanNumber() {
-		return l.errorf("bad number syntax: %q", l.input[l.start:l.pos])
-	}
-	if sign := l.peek(); sign == '+' || sign == '-' {
-		// Complex: 1+2i. No spaces, must end in 'i'.
-		if !l.scanNumber() || l.input[l.pos-1] != 'i' {
-			return l.errorf("bad number syntax: %q", l.input[l.start:l.pos])
-		}
-		l.emit(itemComplex)
-	} else {
-		l.emit(itemNumber)
-	}
-	return lexInsideAction
-}
-
-func (l *lexer) scanNumber() bool {
-	// Optional leading sign.
-	l.accept("+-")
-	// Is it hex?
-	digits := "0123456789"
-	if l.accept("0") && l.accept("xX") {
-		digits = "0123456789abcdefABCDEF"
-	}
-	l.acceptRun(digits)
-	if l.accept(".") {
-		l.acceptRun(digits)
-	}
-	if l.accept("eE") {
-		l.accept("+-")
-		l.acceptRun("0123456789")
-	}
-	// Is it imaginary?
-	l.accept("i")
-	// Next thing mustn't be alphanumeric.
-	if isAlphaNumeric(l.peek()) {
-		l.next()
-		return false
-	}
-	return true
-}
-
-// lexQuote scans a quoted string.
-func lexQuote(l *lexer) stateFn {
-Loop:
-	for {
-		switch l.next() {
-		case '\\':
-			if r := l.next(); r != eof && r != '\n' {
-				break
-			}
-			fallthrough
-		case eof, '\n':
-			return l.errorf("unterminated quoted string")
-		case '"':
-			break Loop
-		}
-	}
-	l.emit(itemString)
-	return lexInsideAction
-}
-
-// lexRawQuote scans a raw quoted string.
-func lexRawQuote(l *lexer) stateFn {
-Loop:
-	for {
-		switch l.next() {
-		case eof, '\n':
-			return l.errorf("unterminated raw quoted string")
-		case '`':
-			break Loop
-		}
-	}
-	l.emit(itemRawString)
-	return lexInsideAction
-}
-
-// isSpace reports whether r is a space character.
-func isSpace(r rune) bool {
-	return r == ' ' || r == '\t'
-}
-
-// isEndOfLine reports whether r is an end-of-line character.
-func isEndOfLine(r rune) bool {
-	return r == '\r' || r == '\n'
-}
-
-// isAlphaNumeric reports whether r is an alphabetic, digit, or underscore.
-func isAlphaNumeric(r rune) bool {
-	return r == '_' || unicode.IsLetter(r) || unicode.IsDigit(r)
-}

vendor/github.com/alecthomas/template/parse/node.go

@@ -1,834 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Parse nodes.
-
-package parse
-
-import (
-	"bytes"
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-var textFormat = "%s" // Changed to "%q" in tests for better error messages.
-
-// A Node is an element in the parse tree. The interface is trivial.
-// The interface contains an unexported method so that only
-// types local to this package can satisfy it.
-type Node interface {
-	Type() NodeType
-	String() string
-	// Copy does a deep copy of the Node and all its components.
-	// To avoid type assertions, some XxxNodes also have specialized
-	// CopyXxx methods that return *XxxNode.
-	Copy() Node
-	Position() Pos // byte position of start of node in full original input string
-	// tree returns the containing *Tree.
-	// It is unexported so all implementations of Node are in this package.
-	tree() *Tree
-}
-
-// NodeType identifies the type of a parse tree node.
-type NodeType int
-
-// Pos represents a byte position in the original input text from which
-// this template was parsed.
-type Pos int
-
-func (p Pos) Position() Pos {
-	return p
-}
-
-// Type returns itself and provides an easy default implementation
-// for embedding in a Node. Embedded in all non-trivial Nodes.
-func (t NodeType) Type() NodeType {
-	return t
-}
-
-const (
-	NodeText       NodeType = iota // Plain text.
-	NodeAction                     // A non-control action such as a field evaluation.
-	NodeBool                       // A boolean constant.
-	NodeChain                      // A sequence of field accesses.
-	NodeCommand                    // An element of a pipeline.
-	NodeDot                        // The cursor, dot.
-	nodeElse                       // An else action. Not added to tree.
-	nodeEnd                        // An end action. Not added to tree.
-	NodeField                      // A field or method name.
-	NodeIdentifier                 // An identifier; always a function name.
-	NodeIf                         // An if action.
-	NodeList                       // A list of Nodes.
-	NodeNil                        // An untyped nil constant.
-	NodeNumber                     // A numerical constant.
-	NodePipe                       // A pipeline of commands.
-	NodeRange                      // A range action.
-	NodeString                     // A string constant.
-	NodeTemplate                   // A template invocation action.
-	NodeVariable                   // A $ variable.
-	NodeWith                       // A with action.
-)
-
-// Nodes.
-
-// ListNode holds a sequence of nodes.
-type ListNode struct {
-	NodeType
-	Pos
-	tr    *Tree
-	Nodes []Node // The element nodes in lexical order.
-}
-
-func (t *Tree) newList(pos Pos) *ListNode {
-	return &ListNode{tr: t, NodeType: NodeList, Pos: pos}
-}
-
-func (l *ListNode) append(n Node) {
-	l.Nodes = append(l.Nodes, n)
-}
-
-func (l *ListNode) tree() *Tree {
-	return l.tr
-}
-
-func (l *ListNode) String() string {
-	b := new(bytes.Buffer)
-	for _, n := range l.Nodes {
-		fmt.Fprint(b, n)
-	}
-	return b.String()
-}
-
-func (l *ListNode) CopyList() *ListNode {
-	if l == nil {
-		return l
-	}
-	n := l.tr.newList(l.Pos)
-	for _, elem := range l.Nodes {
-		n.append(elem.Copy())
-	}
-	return n
-}
-
-func (l *ListNode) Copy() Node {
-	return l.CopyList()
-}
-
-// TextNode holds plain text.
-type TextNode struct {
-	NodeType
-	Pos
-	tr   *Tree
-	Text []byte // The text; may span newlines.
-}
-
-func (t *Tree) newText(pos Pos, text string) *TextNode {
-	return &TextNode{tr: t, NodeType: NodeText, Pos: pos, Text: []byte(text)}
-}
-
-func (t *TextNode) String() string {
-	return fmt.Sprintf(textFormat, t.Text)
-}
-
-func (t *TextNode) tree() *Tree {
-	return t.tr
-}
-
-func (t *TextNode) Copy() Node {
-	return &TextNode{tr: t.tr, NodeType: NodeText, Pos: t.Pos, Text: append([]byte{}, t.Text...)}
-}
-
-// PipeNode holds a pipeline with optional declaration
-type PipeNode struct {
-	NodeType
-	Pos
-	tr   *Tree
-	Line int             // The line number in the input (deprecated; kept for compatibility)
-	Decl []*VariableNode // Variable declarations in lexical order.
-	Cmds []*CommandNode  // The commands in lexical order.
-}
-
-func (t *Tree) newPipeline(pos Pos, line int, decl []*VariableNode) *PipeNode {
-	return &PipeNode{tr: t, NodeType: NodePipe, Pos: pos, Line: line, Decl: decl}
-}
-
-func (p *PipeNode) append(command *CommandNode) {
-	p.Cmds = append(p.Cmds, command)
-}
-
-func (p *PipeNode) String() string {
-	s := ""
-	if len(p.Decl) > 0 {
-		for i, v := range p.Decl {
-			if i > 0 {
-				s += ", "
-			}
-			s += v.String()
-		}
-		s += " := "
-	}
-	for i, c := range p.Cmds {
-		if i > 0 {
-			s += " | "
-		}
-		s += c.String()
-	}
-	return s
-}
-
-func (p *PipeNode) tree() *Tree {
-	return p.tr
-}
-
-func (p *PipeNode) CopyPipe() *PipeNode {
-	if p == nil {
-		return p
-	}
-	var decl []*VariableNode
-	for _, d := range p.Decl {
-		decl = append(decl, d.Copy().(*VariableNode))
-	}
-	n := p.tr.newPipeline(p.Pos, p.Line, decl)
-	for _, c := range p.Cmds {
-		n.append(c.Copy().(*CommandNode))
-	}
-	return n
-}
-
-func (p *PipeNode) Copy() Node {
-	return p.CopyPipe()
-}
-
-// ActionNode holds an action (something bounded by delimiters).
-// Control actions have their own nodes; ActionNode represents simple
-// ones such as field evaluations and parenthesized pipelines.
-type ActionNode struct {
-	NodeType
-	Pos
-	tr   *Tree
-	Line int       // The line number in the input (deprecated; kept for compatibility)
-	Pipe *PipeNode // The pipeline in the action.
-}
-
-func (t *Tree) newAction(pos Pos, line int, pipe *PipeNode) *ActionNode {
-	return &ActionNode{tr: t, NodeType: NodeAction, Pos: pos, Line: line, Pipe: pipe}
-}
-
-func (a *ActionNode) String() string {
-	return fmt.Sprintf("{{%s}}", a.Pipe)
-
-}
-
-func (a *ActionNode) tree() *Tree {
-	return a.tr
-}
-
-func (a *ActionNode) Copy() Node {
-	return a.tr.newAction(a.Pos, a.Line, a.Pipe.CopyPipe())
-
-}
-
-// CommandNode holds a command (a pipeline inside an evaluating action).
-type CommandNode struct {
-	NodeType
-	Pos
-	tr   *Tree
-	Args []Node // Arguments in lexical order: Identifier, field, or constant.
-}
-
-func (t *Tree) newCommand(pos Pos) *CommandNode {
-	return &CommandNode{tr: t, NodeType: NodeCommand, Pos: pos}
-}
-
-func (c *CommandNode) append(arg Node) {
-	c.Args = append(c.Args, arg)
-}
-
-func (c *CommandNode) String() string {
-	s := ""
-	for i, arg := range c.Args {
-		if i > 0 {
-			s += " "
-		}
-		if arg, ok := arg.(*PipeNode); ok {
-			s += "(" + arg.String() + ")"
-			continue
-		}
-		s += arg.String()
-	}
-	return s
-}
-
-func (c *CommandNode) tree() *Tree {
-	return c.tr
-}
-
-func (c *CommandNode) Copy() Node {
-	if c == nil {
-		return c
-	}
-	n := c.tr.newCommand(c.Pos)
-	for _, c := range c.Args {
-		n.append(c.Copy())
-	}
-	return n
-}
-
-// IdentifierNode holds an identifier.
-type IdentifierNode struct {
-	NodeType
-	Pos
-	tr    *Tree
-	Ident string // The identifier's name.
-}
-
-// NewIdentifier returns a new IdentifierNode with the given identifier name.
-func NewIdentifier(ident string) *IdentifierNode {
-	return &IdentifierNode{NodeType: NodeIdentifier, Ident: ident}
-}
-
-// SetPos sets the position. NewIdentifier is a public method so we can't modify its signature.
-// Chained for convenience.
-// TODO: fix one day?
-func (i *IdentifierNode) SetPos(pos Pos) *IdentifierNode {
-	i.Pos = pos
-	return i
-}
-
-// SetTree sets the parent tree for the node. NewIdentifier is a public method so we can't modify its signature.
-// Chained for convenience.
-// TODO: fix one day?
-func (i *IdentifierNode) SetTree(t *Tree) *IdentifierNode {
-	i.tr = t
-	return i
-}
-
-func (i *IdentifierNode) String() string {
-	return i.Ident
-}
-
-func (i *IdentifierNode) tree() *Tree {
-	return i.tr
-}
-
-func (i *IdentifierNode) Copy() Node {
-	return NewIdentifier(i.Ident).SetTree(i.tr).SetPos(i.Pos)
-}
-
-// VariableNode holds a list of variable names, possibly with chained field
-// accesses. The dollar sign is part of the (first) name.
-type VariableNode struct {
-	NodeType
-	Pos
-	tr    *Tree
-	Ident []string // Variable name and fields in lexical order.
-}
-
-func (t *Tree) newVariable(pos Pos, ident string) *VariableNode {
-	return &VariableNode{tr: t, NodeType: NodeVariable, Pos: pos, Ident: strings.Split(ident, ".")}
-}
-
-func (v *VariableNode) String() string {
-	s := ""
-	for i, id := range v.Ident {
-		if i > 0 {
-			s += "."
-		}
-		s += id
-	}
-	return s
-}
-
-func (v *VariableNode) tree() *Tree {
-	return v.tr
-}
-
-func (v *VariableNode) Copy() Node {
-	return &VariableNode{tr: v.tr, NodeType: NodeVariable, Pos: v.Pos, Ident: append([]string{}, v.Ident...)}
-}
-
-// DotNode holds the special identifier '.'.
-type DotNode struct {
-	NodeType
-	Pos
-	tr *Tree
-}
-
-func (t *Tree) newDot(pos Pos) *DotNode {
-	return &DotNode{tr: t, NodeType: NodeDot, Pos: pos}
-}
-
-func (d *DotNode) Type() NodeType {
-	// Override method on embedded NodeType for API compatibility.
-	// TODO: Not really a problem; could change API without effect but
-	// api tool complains.
-	return NodeDot
-}
-
-func (d *DotNode) String() string {
-	return "."
-}
-
-func (d *DotNode) tree() *Tree {
-	return d.tr
-}
-
-func (d *DotNode) Copy() Node {
-	return d.tr.newDot(d.Pos)
-}
-
-// NilNode holds the special identifier 'nil' representing an untyped nil constant.
-type NilNode struct {
-	NodeType
-	Pos
-	tr *Tree
-}
-
-func (t *Tree) newNil(pos Pos) *NilNode {
-	return &NilNode{tr: t, NodeType: NodeNil, Pos: pos}
-}
-
-func (n *NilNode) Type() NodeType {
-	// Override method on embedded NodeType for API compatibility.
-	// TODO: Not really a problem; could change API without effect but
-	// api tool complains.
-	return NodeNil
-}
-
-func (n *NilNode) String() string {
-	return "nil"
-}
-
-func (n *NilNode) tree() *Tree {
-	return n.tr
-}
-
-func (n *NilNode) Copy() Node {
-	return n.tr.newNil(n.Pos)
-}
-
-// FieldNode holds a field (identifier starting with '.').
-// The names may be chained ('.x.y').
-// The period is dropped from each ident.
-type FieldNode struct {
-	NodeType
-	Pos
-	tr    *Tree
-	Ident []string // The identifiers in lexical order.
-}
-
-func (t *Tree) newField(pos Pos, ident string) *FieldNode {
-	return &FieldNode{tr: t, NodeType: NodeField, Pos: pos, Ident: strings.Split(ident[1:], ".")} // [1:] to drop leading period
-}
-
-func (f *FieldNode) String() string {
-	s := ""
-	for _, id := range f.Ident {
-		s += "." + id
-	}
-	return s
-}
-
-func (f *FieldNode) tree() *Tree {
-	return f.tr
-}
-
-func (f *FieldNode) Copy() Node {
-	return &FieldNode{tr: f.tr, NodeType: NodeField, Pos: f.Pos, Ident: append([]string{}, f.Ident...)}
-}
-
-// ChainNode holds a term followed by a chain of field accesses (identifier starting with '.').
-// The names may be chained ('.x.y').
-// The periods are dropped from each ident.
-type ChainNode struct {
-	NodeType
-	Pos
-	tr    *Tree
-	Node  Node
-	Field []string // The identifiers in lexical order.
-}
-
-func (t *Tree) newChain(pos Pos, node Node) *ChainNode {
-	return &ChainNode{tr: t, NodeType: NodeChain, Pos: pos, Node: node}
-}
-
-// Add adds the named field (which should start with a period) to the end of the chain.
-func (c *ChainNode) Add(field string) {
-	if len(field) == 0 || field[0] != '.' {
-		panic("no dot in field")
-	}
-	field = field[1:] // Remove leading dot.
-	if field == "" {
-		panic("empty field")
-	}
-	c.Field = append(c.Field, field)
-}
-
-func (c *ChainNode) String() string {
-	s := c.Node.String()
-	if _, ok := c.Node.(*PipeNode); ok {
-		s = "(" + s + ")"
-	}
-	for _, field := range c.Field {
-		s += "." + field
-	}
-	return s
-}
-
-func (c *ChainNode) tree() *Tree {
-	return c.tr
-}
-
-func (c *ChainNode) Copy() Node {
-	return &ChainNode{tr: c.tr, NodeType: NodeChain, Pos: c.Pos, Node: c.Node, Field: append([]string{}, c.Field...)}
-}
-
-// BoolNode holds a boolean constant.
-type BoolNode struct {
-	NodeType
-	Pos
-	tr   *Tree
-	True bool // The value of the boolean constant.
-}
-
-func (t *Tree) newBool(pos Pos, true bool) *BoolNode {
-	return &BoolNode{tr: t, NodeType: NodeBool, Pos: pos, True: true}
-}
-
-func (b *BoolNode) String() string {
-	if b.True {
-		return "true"
-	}
-	return "false"
-}
-
-func (b *BoolNode) tree() *Tree {
-	return b.tr
-}
-
-func (b *BoolNode) Copy() Node {
-	return b.tr.newBool(b.Pos, b.True)
-}
-
-// NumberNode holds a number: signed or unsigned integer, float, or complex.
-// The value is parsed and stored under all the types that can represent the value.
-// This simulates in a small amount of code the behavior of Go's ideal constants.
-type NumberNode struct {
-	NodeType
-	Pos
-	tr         *Tree
-	IsInt      bool       // Number has an integral value.
-	IsUint     bool       // Number has an unsigned integral value.
-	IsFloat    bool       // Number has a floating-point value.
-	IsComplex  bool       // Number is complex.
-	Int64      int64      // The signed integer value.
-	Uint64     uint64     // The unsigned integer value.
-	Float64    float64    // The floating-point value.
-	Complex128 complex128 // The complex value.
-	Text       string     // The original textual representation from the input.
-}
-
-func (t *Tree) newNumber(pos Pos, text string, typ itemType) (*NumberNode, error) {
-	n := &NumberNode{tr: t, NodeType: NodeNumber, Pos: pos, Text: text}
-	switch typ {
-	case itemCharConstant:
-		rune, _, tail, err := strconv.UnquoteChar(text[1:], text[0])
-		if err != nil {
-			return nil, err
-		}
-		if tail != "'" {
-			return nil, fmt.Errorf("malformed character constant: %s", text)
-		}
-		n.Int64 = int64(rune)
-		n.IsInt = true
-		n.Uint64 = uint64(rune)
-		n.IsUint = true
-		n.Float64 = float64(rune) // odd but those are the rules.
-		n.IsFloat = true
-		return n, nil
-	case itemComplex:
-		// fmt.Sscan can parse the pair, so let it do the work.
-		if _, err := fmt.Sscan(text, &n.Complex128); err != nil {
-			return nil, err
-		}
-		n.IsComplex = true
-		n.simplifyComplex()
-		return n, nil
-	}
-	// Imaginary constants can only be complex unless they are zero.
-	if len(text) > 0 && text[len(text)-1] == 'i' {
-		f, err := strconv.ParseFloat(text[:len(text)-1], 64)
-		if err == nil {
-			n.IsComplex = true
-			n.Complex128 = complex(0, f)
-			n.simplifyComplex()
-			return n, nil
-		}
-	}
-	// Do integer test first so we get 0x123 etc.
-	u, err := strconv.ParseUint(text, 0, 64) // will fail for -0; fixed below.
-	if err == nil {
-		n.IsUint = true
-		n.Uint64 = u
-	}
-	i, err := strconv.ParseInt(text, 0, 64)
-	if err == nil {
-		n.IsInt = true
-		n.Int64 = i
-		if i == 0 {
-			n.IsUint = true // in case of -0.
-			n.Uint64 = u
-		}
-	}
-	// If an integer extraction succeeded, promote the float.
-	if n.IsInt {
-		n.IsFloat = true
-		n.Float64 = float64(n.Int64)
-	} else if n.IsUint {
-		n.IsFloat = true
-		n.Float64 = float64(n.Uint64)
-	} else {
-		f, err := strconv.ParseFloat(text, 64)
-		if err == nil {
-			n.IsFloat = true
-			n.Float64 = f
-			// If a floating-point extraction succeeded, extract the int if needed.
-			if !n.IsInt && float64(int64(f)) == f {
-				n.IsInt = true
-				n.Int64 = int64(f)
-			}
-			if !n.IsUint && float64(uint64(f)) == f {
-				n.IsUint = true
-				n.Uint64 = uint64(f)
-			}
-		}
-	}
-	if !n.IsInt && !n.IsUint && !n.IsFloat {
-		return nil, fmt.Errorf("illegal number syntax: %q", text)
-	}
-	return n, nil
-}
-
-// simplifyComplex pulls out any other types that are represented by the complex number.
-// These all require that the imaginary part be zero.
-func (n *NumberNode) simplifyComplex() {
-	n.IsFloat = imag(n.Complex128) == 0
-	if n.IsFloat {
-		n.Float64 = real(n.Complex128)
-		n.IsInt = float64(int64(n.Float64)) == n.Float64
-		if n.IsInt {
-			n.Int64 = int64(n.Float64)
-		}
-		n.IsUint = float64(uint64(n.Float64)) == n.Float64
-		if n.IsUint {
-			n.Uint64 = uint64(n.Float64)
-		}
-	}
-}
-
-func (n *NumberNode) String() string {
-	return n.Text
-}
-
-func (n *NumberNode) tree() *Tree {
-	return n.tr
-}
-
-func (n *NumberNode) Copy() Node {
-	nn := new(NumberNode)
-	*nn = *n // Easy, fast, correct.
-	return nn
-}
-
-// StringNode holds a string constant. The value has been "unquoted".
-type StringNode struct {
-	NodeType
-	Pos
-	tr     *Tree
-	Quoted string // The original text of the string, with quotes.
-	Text   string // The string, after quote processing.
-}
-
-func (t *Tree) newString(pos Pos, orig, text string) *StringNode {
-	return &StringNode{tr: t, NodeType: NodeString, Pos: pos, Quoted: orig, Text: text}
-}
-
-func (s *StringNode) String() string {
-	return s.Quoted
-}
-
-func (s *StringNode) tree() *Tree {
-	return s.tr
-}
-
-func (s *StringNode) Copy() Node {
-	return s.tr.newString(s.Pos, s.Quoted, s.Text)
-}
-
-// endNode represents an {{end}} action.
-// It does not appear in the final parse tree.
-type endNode struct {
-	NodeType
-	Pos
-	tr *Tree
-}
-
-func (t *Tree) newEnd(pos Pos) *endNode {
-	return &endNode{tr: t, NodeType: nodeEnd, Pos: pos}
-}
-
-func (e *endNode) String() string {
-	return "{{end}}"
-}
-
-func (e *endNode) tree() *Tree {
-	return e.tr
-}
-
-func (e *endNode) Copy() Node {
-	return e.tr.newEnd(e.Pos)
-}
-
-// elseNode represents an {{else}} action. Does not appear in the final tree.
-type elseNode struct {
-	NodeType
-	Pos
-	tr   *Tree
-	Line int // The line number in the input (deprecated; kept for compatibility)
-}
-
-func (t *Tree) newElse(pos Pos, line int) *elseNode {
-	return &elseNode{tr: t, NodeType: nodeElse, Pos: pos, Line: line}
-}
-
-func (e *elseNode) Type() NodeType {
-	return nodeElse
-}
-
-func (e *elseNode) String() string {
-	return "{{else}}"
-}
-
-func (e *elseNode) tree() *Tree {
-	return e.tr
-}
-
-func (e *elseNode) Copy() Node {
-	return e.tr.newElse(e.Pos, e.Line)
-}
-
-// BranchNode is the common representation of if, range, and with.
-type BranchNode struct {
-	NodeType
-	Pos
-	tr       *Tree
-	Line     int       // The line number in the input (deprecated; kept for compatibility)
-	Pipe     *PipeNode // The pipeline to be evaluated.
-	List     *ListNode // What to execute if the value is non-empty.
-	ElseList *ListNode // What to execute if the value is empty (nil if absent).
-}
-
-func (b *BranchNode) String() string {
-	name := ""
-	switch b.NodeType {
-	case NodeIf:
-		name = "if"
-	case NodeRange:
-		name = "range"
-	case NodeWith:
-		name = "with"
-	default:
-		panic("unknown branch type")
-	}
-	if b.ElseList != nil {
-		return fmt.Sprintf("{{%s %s}}%s{{else}}%s{{end}}", name, b.Pipe, b.List, b.ElseList)
-	}
-	return fmt.Sprintf("{{%s %s}}%s{{end}}", name, b.Pipe, b.List)
-}
-
-func (b *BranchNode) tree() *Tree {
-	return b.tr
-}
-
-func (b *BranchNode) Copy() Node {
-	switch b.NodeType {
-	case NodeIf:
-		return b.tr.newIf(b.Pos, b.Line, b.Pipe, b.List, b.ElseList)
-	case NodeRange:
-		return b.tr.newRange(b.Pos, b.Line, b.Pipe, b.List, b.ElseList)
-	case NodeWith:
-		return b.tr.newWith(b.Pos, b.Line, b.Pipe, b.List, b.ElseList)
-	default:
-		panic("unknown branch type")
-	}
-}
-
-// IfNode represents an {{if}} action and its commands.
-type IfNode struct {
-	BranchNode
-}
-
-func (t *Tree) newIf(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *IfNode {
-	return &IfNode{BranchNode{tr: t, NodeType: NodeIf, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}}
-}
-
-func (i *IfNode) Copy() Node {
-	return i.tr.newIf(i.Pos, i.Line, i.Pipe.CopyPipe(), i.List.CopyList(), i.ElseList.CopyList())
-}
-
-// RangeNode represents a {{range}} action and its commands.
-type RangeNode struct {
-	BranchNode
-}
-
-func (t *Tree) newRange(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *RangeNode {
-	return &RangeNode{BranchNode{tr: t, NodeType: NodeRange, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}}
-}
-
-func (r *RangeNode) Copy() Node {
-	return r.tr.newRange(r.Pos, r.Line, r.Pipe.CopyPipe(), r.List.CopyList(), r.ElseList.CopyList())
-}
-
-// WithNode represents a {{with}} action and its commands.
-type WithNode struct {
-	BranchNode
-}
-
-func (t *Tree) newWith(pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) *WithNode {
-	return &WithNode{BranchNode{tr: t, NodeType: NodeWith, Pos: pos, Line: line, Pipe: pipe, List: list, ElseList: elseList}}
-}
-
-func (w *WithNode) Copy() Node {
-	return w.tr.newWith(w.Pos, w.Line, w.Pipe.CopyPipe(), w.List.CopyList(), w.ElseList.CopyList())
-}
-
-// TemplateNode represents a {{template}} action.
-type TemplateNode struct {
-	NodeType
-	Pos
-	tr   *Tree
-	Line int       // The line number in the input (deprecated; kept for compatibility)
-	Name string    // The name of the template (unquoted).
-	Pipe *PipeNode // The command to evaluate as dot for the template.
-}
-
-func (t *Tree) newTemplate(pos Pos, line int, name string, pipe *PipeNode) *TemplateNode {
-	return &TemplateNode{tr: t, NodeType: NodeTemplate, Pos: pos, Line: line, Name: name, Pipe: pipe}
-}
-
-func (t *TemplateNode) String() string {
-	if t.Pipe == nil {
-		return fmt.Sprintf("{{template %q}}", t.Name)
-	}
-	return fmt.Sprintf("{{template %q %s}}", t.Name, t.Pipe)
-}
-
-func (t *TemplateNode) tree() *Tree {
-	return t.tr
-}
-
-func (t *TemplateNode) Copy() Node {
-	return t.tr.newTemplate(t.Pos, t.Line, t.Name, t.Pipe.CopyPipe())
-}

vendor/github.com/alecthomas/template/parse/parse.go

@@ -1,700 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package parse builds parse trees for templates as defined by text/template
-// and html/template. Clients should use those packages to construct templates
-// rather than this one, which provides shared internal data structures not
-// intended for general use.
-package parse
-
-import (
-	"bytes"
-	"fmt"
-	"runtime"
-	"strconv"
-	"strings"
-)
-
-// Tree is the representation of a single parsed template.
-type Tree struct {
-	Name      string    // name of the template represented by the tree.
-	ParseName string    // name of the top-level template during parsing, for error messages.
-	Root      *ListNode // top-level root of the tree.
-	text      string    // text parsed to create the template (or its parent)
-	// Parsing only; cleared after parse.
-	funcs     []map[string]interface{}
-	lex       *lexer
-	token     [3]item // three-token lookahead for parser.
-	peekCount int
-	vars      []string // variables defined at the moment.
-}
-
-// Copy returns a copy of the Tree. Any parsing state is discarded.
-func (t *Tree) Copy() *Tree {
-	if t == nil {
-		return nil
-	}
-	return &Tree{
-		Name:      t.Name,
-		ParseName: t.ParseName,
-		Root:      t.Root.CopyList(),
-		text:      t.text,
-	}
-}
-
-// Parse returns a map from template name to parse.Tree, created by parsing the
-// templates described in the argument string. The top-level template will be
-// given the specified name. If an error is encountered, parsing stops and an
-// empty map is returned with the error.
-func Parse(name, text, leftDelim, rightDelim string, funcs ...map[string]interface{}) (treeSet map[string]*Tree, err error) {
-	treeSet = make(map[string]*Tree)
-	t := New(name)
-	t.text = text
-	_, err = t.Parse(text, leftDelim, rightDelim, treeSet, funcs...)
-	return
-}
-
-// next returns the next token.
-func (t *Tree) next() item {
-	if t.peekCount > 0 {
-		t.peekCount--
-	} else {
-		t.token[0] = t.lex.nextItem()
-	}
-	return t.token[t.peekCount]
-}
-
-// backup backs the input stream up one token.
-func (t *Tree) backup() {
-	t.peekCount++
-}
-
-// backup2 backs the input stream up two tokens.
-// The zeroth token is already there.
-func (t *Tree) backup2(t1 item) {
-	t.token[1] = t1
-	t.peekCount = 2
-}
-
-// backup3 backs the input stream up three tokens
-// The zeroth token is already there.
-func (t *Tree) backup3(t2, t1 item) { // Reverse order: we're pushing back.
-	t.token[1] = t1
-	t.token[2] = t2
-	t.peekCount = 3
-}
-
-// peek returns but does not consume the next token.
-func (t *Tree) peek() item {
-	if t.peekCount > 0 {
-		return t.token[t.peekCount-1]
-	}
-	t.peekCount = 1
-	t.token[0] = t.lex.nextItem()
-	return t.token[0]
-}
-
-// nextNonSpace returns the next non-space token.
-func (t *Tree) nextNonSpace() (token item) {
-	for {
-		token = t.next()
-		if token.typ != itemSpace {
-			break
-		}
-	}
-	return token
-}
-
-// peekNonSpace returns but does not consume the next non-space token.
-func (t *Tree) peekNonSpace() (token item) {
-	for {
-		token = t.next()
-		if token.typ != itemSpace {
-			break
-		}
-	}
-	t.backup()
-	return token
-}
-
-// Parsing.
-
-// New allocates a new parse tree with the given name.
-func New(name string, funcs ...map[string]interface{}) *Tree {
-	return &Tree{
-		Name:  name,
-		funcs: funcs,
-	}
-}
-
-// ErrorContext returns a textual representation of the location of the node in the input text.
-// The receiver is only used when the node does not have a pointer to the tree inside,
-// which can occur in old code.
-func (t *Tree) ErrorContext(n Node) (location, context string) {
-	pos := int(n.Position())
-	tree := n.tree()
-	if tree == nil {
-		tree = t
-	}
-	text := tree.text[:pos]
-	byteNum := strings.LastIndex(text, "\n")
-	if byteNum == -1 {
-		byteNum = pos // On first line.
-	} else {
-		byteNum++ // After the newline.
-		byteNum = pos - byteNum
-	}
-	lineNum := 1 + strings.Count(text, "\n")
-	context = n.String()
-	if len(context) > 20 {
-		context = fmt.Sprintf("%.20s...", context)
-	}
-	return fmt.Sprintf("%s:%d:%d", tree.ParseName, lineNum, byteNum), context
-}
-
-// errorf formats the error and terminates processing.
-func (t *Tree) errorf(format string, args ...interface{}) {
-	t.Root = nil
-	format = fmt.Sprintf("template: %s:%d: %s", t.ParseName, t.lex.lineNumber(), format)
-	panic(fmt.Errorf(format, args...))
-}
-
-// error terminates processing.
-func (t *Tree) error(err error) {
-	t.errorf("%s", err)
-}
-
-// expect consumes the next token and guarantees it has the required type.
-func (t *Tree) expect(expected itemType, context string) item {
-	token := t.nextNonSpace()
-	if token.typ != expected {
-		t.unexpected(token, context)
-	}
-	return token
-}
-
-// expectOneOf consumes the next token and guarantees it has one of the required types.
-func (t *Tree) expectOneOf(expected1, expected2 itemType, context string) item {
-	token := t.nextNonSpace()
-	if token.typ != expected1 && token.typ != expected2 {
-		t.unexpected(token, context)
-	}
-	return token
-}
-
-// unexpected complains about the token and terminates processing.
-func (t *Tree) unexpected(token item, context string) {
-	t.errorf("unexpected %s in %s", token, context)
-}
-
-// recover is the handler that turns panics into returns from the top level of Parse.
-func (t *Tree) recover(errp *error) {
-	e := recover()
-	if e != nil {
-		if _, ok := e.(runtime.Error); ok {
-			panic(e)
-		}
-		if t != nil {
-			t.stopParse()
-		}
-		*errp = e.(error)
-	}
-	return
-}
-
-// startParse initializes the parser, using the lexer.
-func (t *Tree) startParse(funcs []map[string]interface{}, lex *lexer) {
-	t.Root = nil
-	t.lex = lex
-	t.vars = []string{"$"}
-	t.funcs = funcs
-}
-
-// stopParse terminates parsing.
-func (t *Tree) stopParse() {
-	t.lex = nil
-	t.vars = nil
-	t.funcs = nil
-}
-
-// Parse parses the template definition string to construct a representation of
-// the template for execution. If either action delimiter string is empty, the
-// default ("{{" or "}}") is used. Embedded template definitions are added to
-// the treeSet map.
-func (t *Tree) Parse(text, leftDelim, rightDelim string, treeSet map[string]*Tree, funcs ...map[string]interface{}) (tree *Tree, err error) {
-	defer t.recover(&err)
-	t.ParseName = t.Name
-	t.startParse(funcs, lex(t.Name, text, leftDelim, rightDelim))
-	t.text = text
-	t.parse(treeSet)
-	t.add(treeSet)
-	t.stopParse()
-	return t, nil
-}
-
-// add adds tree to the treeSet.
-func (t *Tree) add(treeSet map[string]*Tree) {
-	tree := treeSet[t.Name]
-	if tree == nil || IsEmptyTree(tree.Root) {
-		treeSet[t.Name] = t
-		return
-	}
-	if !IsEmptyTree(t.Root) {
-		t.errorf("template: multiple definition of template %q", t.Name)
-	}
-}
-
-// IsEmptyTree reports whether this tree (node) is empty of everything but space.
-func IsEmptyTree(n Node) bool {
-	switch n := n.(type) {
-	case nil:
-		return true
-	case *ActionNode:
-	case *IfNode:
-	case *ListNode:
-		for _, node := range n.Nodes {
-			if !IsEmptyTree(node) {
-				return false
-			}
-		}
-		return true
-	case *RangeNode:
-	case *TemplateNode:
-	case *TextNode:
-		return len(bytes.TrimSpace(n.Text)) == 0
-	case *WithNode:
-	default:
-		panic("unknown node: " + n.String())
-	}
-	return false
-}
-
-// parse is the top-level parser for a template, essentially the same
-// as itemList except it also parses {{define}} actions.
-// It runs to EOF.
-func (t *Tree) parse(treeSet map[string]*Tree) (next Node) {
-	t.Root = t.newList(t.peek().pos)
-	for t.peek().typ != itemEOF {
-		if t.peek().typ == itemLeftDelim {
-			delim := t.next()
-			if t.nextNonSpace().typ == itemDefine {
-				newT := New("definition") // name will be updated once we know it.
-				newT.text = t.text
-				newT.ParseName = t.ParseName
-				newT.startParse(t.funcs, t.lex)
-				newT.parseDefinition(treeSet)
-				continue
-			}
-			t.backup2(delim)
-		}
-		n := t.textOrAction()
-		if n.Type() == nodeEnd {
-			t.errorf("unexpected %s", n)
-		}
-		t.Root.append(n)
-	}
-	return nil
-}
-
-// parseDefinition parses a {{define}} ...  {{end}} template definition and
-// installs the definition in the treeSet map.  The "define" keyword has already
-// been scanned.
-func (t *Tree) parseDefinition(treeSet map[string]*Tree) {
-	const context = "define clause"
-	name := t.expectOneOf(itemString, itemRawString, context)
-	var err error
-	t.Name, err = strconv.Unquote(name.val)
-	if err != nil {
-		t.error(err)
-	}
-	t.expect(itemRightDelim, context)
-	var end Node
-	t.Root, end = t.itemList()
-	if end.Type() != nodeEnd {
-		t.errorf("unexpected %s in %s", end, context)
-	}
-	t.add(treeSet)
-	t.stopParse()
-}
-
-// itemList:
-//	textOrAction*
-// Terminates at {{end}} or {{else}}, returned separately.
-func (t *Tree) itemList() (list *ListNode, next Node) {
-	list = t.newList(t.peekNonSpace().pos)
-	for t.peekNonSpace().typ != itemEOF {
-		n := t.textOrAction()
-		switch n.Type() {
-		case nodeEnd, nodeElse:
-			return list, n
-		}
-		list.append(n)
-	}
-	t.errorf("unexpected EOF")
-	return
-}
-
-// textOrAction:
-//	text | action
-func (t *Tree) textOrAction() Node {
-	switch token := t.nextNonSpace(); token.typ {
-	case itemElideNewline:
-		return t.elideNewline()
-	case itemText:
-		return t.newText(token.pos, token.val)
-	case itemLeftDelim:
-		return t.action()
-	default:
-		t.unexpected(token, "input")
-	}
-	return nil
-}
-
-// elideNewline:
-// Remove newlines trailing rightDelim if \\ is present.
-func (t *Tree) elideNewline() Node {
-	token := t.peek()
-	if token.typ != itemText {
-		t.unexpected(token, "input")
-		return nil
-	}
-
-	t.next()
-	stripped := strings.TrimLeft(token.val, "\n\r")
-	diff := len(token.val) - len(stripped)
-	if diff > 0 {
-		// This is a bit nasty. We mutate the token in-place to remove
-		// preceding newlines.
-		token.pos += Pos(diff)
-		token.val = stripped
-	}
-	return t.newText(token.pos, token.val)
-}
-
-// Action:
-//	control
-//	command ("|" command)*
-// Left delim is past. Now get actions.
-// First word could be a keyword such as range.
-func (t *Tree) action() (n Node) {
-	switch token := t.nextNonSpace(); token.typ {
-	case itemElse:
-		return t.elseControl()
-	case itemEnd:
-		return t.endControl()
-	case itemIf:
-		return t.ifControl()
-	case itemRange:
-		return t.rangeControl()
-	case itemTemplate:
-		return t.templateControl()
-	case itemWith:
-		return t.withControl()
-	}
-	t.backup()
-	// Do not pop variables; they persist until "end".
-	return t.newAction(t.peek().pos, t.lex.lineNumber(), t.pipeline("command"))
-}
-
-// Pipeline:
-//	declarations? command ('|' command)*
-func (t *Tree) pipeline(context string) (pipe *PipeNode) {
-	var decl []*VariableNode
-	pos := t.peekNonSpace().pos
-	// Are there declarations?
-	for {
-		if v := t.peekNonSpace(); v.typ == itemVariable {
-			t.next()
-			// Since space is a token, we need 3-token look-ahead here in the worst case:
-			// in "$x foo" we need to read "foo" (as opposed to ":=") to know that $x is an
-			// argument variable rather than a declaration. So remember the token
-			// adjacent to the variable so we can push it back if necessary.
-			tokenAfterVariable := t.peek()
-			if next := t.peekNonSpace(); next.typ == itemColonEquals || (next.typ == itemChar && next.val == ",") {
-				t.nextNonSpace()
-				variable := t.newVariable(v.pos, v.val)
-				decl = append(decl, variable)
-				t.vars = append(t.vars, v.val)
-				if next.typ == itemChar && next.val == "," {
-					if context == "range" && len(decl) < 2 {
-						continue
-					}
-					t.errorf("too many declarations in %s", context)
-				}
-			} else if tokenAfterVariable.typ == itemSpace {
-				t.backup3(v, tokenAfterVariable)
-			} else {
-				t.backup2(v)
-			}
-		}
-		break
-	}
-	pipe = t.newPipeline(pos, t.lex.lineNumber(), decl)
-	for {
-		switch token := t.nextNonSpace(); token.typ {
-		case itemRightDelim, itemRightParen:
-			if len(pipe.Cmds) == 0 {
-				t.errorf("missing value for %s", context)
-			}
-			if token.typ == itemRightParen {
-				t.backup()
-			}
-			return
-		case itemBool, itemCharConstant, itemComplex, itemDot, itemField, itemIdentifier,
-			itemNumber, itemNil, itemRawString, itemString, itemVariable, itemLeftParen:
-			t.backup()
-			pipe.append(t.command())
-		default:
-			t.unexpected(token, context)
-		}
-	}
-}
-
-func (t *Tree) parseControl(allowElseIf bool, context string) (pos Pos, line int, pipe *PipeNode, list, elseList *ListNode) {
-	defer t.popVars(len(t.vars))
-	line = t.lex.lineNumber()
-	pipe = t.pipeline(context)
-	var next Node
-	list, next = t.itemList()
-	switch next.Type() {
-	case nodeEnd: //done
-	case nodeElse:
-		if allowElseIf {
-			// Special case for "else if". If the "else" is followed immediately by an "if",
-			// the elseControl will have left the "if" token pending. Treat
-			//	{{if a}}_{{else if b}}_{{end}}
-			// as
-			//	{{if a}}_{{else}}{{if b}}_{{end}}{{end}}.
-			// To do this, parse the if as usual and stop at it {{end}}; the subsequent{{end}}
-			// is assumed. This technique works even for long if-else-if chains.
-			// TODO: Should we allow else-if in with and range?
-			if t.peek().typ == itemIf {
-				t.next() // Consume the "if" token.
-				elseList = t.newList(next.Position())
-				elseList.append(t.ifControl())
-				// Do not consume the next item - only one {{end}} required.
-				break
-			}
-		}
-		elseList, next = t.itemList()
-		if next.Type() != nodeEnd {
-			t.errorf("expected end; found %s", next)
-		}
-	}
-	return pipe.Position(), line, pipe, list, elseList
-}
-
-// If:
-//	{{if pipeline}} itemList {{end}}
-//	{{if pipeline}} itemList {{else}} itemList {{end}}
-// If keyword is past.
-func (t *Tree) ifControl() Node {
-	return t.newIf(t.parseControl(true, "if"))
-}
-
-// Range:
-//	{{range pipeline}} itemList {{end}}
-//	{{range pipeline}} itemList {{else}} itemList {{end}}
-// Range keyword is past.
-func (t *Tree) rangeControl() Node {
-	return t.newRange(t.parseControl(false, "range"))
-}
-
-// With:
-//	{{with pipeline}} itemList {{end}}
-//	{{with pipeline}} itemList {{else}} itemList {{end}}
-// If keyword is past.
-func (t *Tree) withControl() Node {
-	return t.newWith(t.parseControl(false, "with"))
-}
-
-// End:
-//	{{end}}
-// End keyword is past.
-func (t *Tree) endControl() Node {
-	return t.newEnd(t.expect(itemRightDelim, "end").pos)
-}
-
-// Else:
-//	{{else}}
-// Else keyword is past.
-func (t *Tree) elseControl() Node {
-	// Special case for "else if".
-	peek := t.peekNonSpace()
-	if peek.typ == itemIf {
-		// We see "{{else if ... " but in effect rewrite it to {{else}}{{if ... ".
-		return t.newElse(peek.pos, t.lex.lineNumber())
-	}
-	return t.newElse(t.expect(itemRightDelim, "else").pos, t.lex.lineNumber())
-}
-
-// Template:
-//	{{template stringValue pipeline}}
-// Template keyword is past.  The name must be something that can evaluate
-// to a string.
-func (t *Tree) templateControl() Node {
-	var name string
-	token := t.nextNonSpace()
-	switch token.typ {
-	case itemString, itemRawString:
-		s, err := strconv.Unquote(token.val)
-		if err != nil {
-			t.error(err)
-		}
-		name = s
-	default:
-		t.unexpected(token, "template invocation")
-	}
-	var pipe *PipeNode
-	if t.nextNonSpace().typ != itemRightDelim {
-		t.backup()
-		// Do not pop variables; they persist until "end".
-		pipe = t.pipeline("template")
-	}
-	return t.newTemplate(token.pos, t.lex.lineNumber(), name, pipe)
-}
-
-// command:
-//	operand (space operand)*
-// space-separated arguments up to a pipeline character or right delimiter.
-// we consume the pipe character but leave the right delim to terminate the action.
-func (t *Tree) command() *CommandNode {
-	cmd := t.newCommand(t.peekNonSpace().pos)
-	for {
-		t.peekNonSpace() // skip leading spaces.
-		operand := t.operand()
-		if operand != nil {
-			cmd.append(operand)
-		}
-		switch token := t.next(); token.typ {
-		case itemSpace:
-			continue
-		case itemError:
-			t.errorf("%s", token.val)
-		case itemRightDelim, itemRightParen:
-			t.backup()
-		case itemPipe:
-		default:
-			t.errorf("unexpected %s in operand; missing space?", token)
-		}
-		break
-	}
-	if len(cmd.Args) == 0 {
-		t.errorf("empty command")
-	}
-	return cmd
-}
-
-// operand:
-//	term .Field*
-// An operand is a space-separated component of a command,
-// a term possibly followed by field accesses.
-// A nil return means the next item is not an operand.
-func (t *Tree) operand() Node {
-	node := t.term()
-	if node == nil {
-		return nil
-	}
-	if t.peek().typ == itemField {
-		chain := t.newChain(t.peek().pos, node)
-		for t.peek().typ == itemField {
-			chain.Add(t.next().val)
-		}
-		// Compatibility with original API: If the term is of type NodeField
-		// or NodeVariable, just put more fields on the original.
-		// Otherwise, keep the Chain node.
-		// TODO: Switch to Chains always when we can.
-		switch node.Type() {
-		case NodeField:
-			node = t.newField(chain.Position(), chain.String())
-		case NodeVariable:
-			node = t.newVariable(chain.Position(), chain.String())
-		default:
-			node = chain
-		}
-	}
-	return node
-}
-
-// term:
-//	literal (number, string, nil, boolean)
-//	function (identifier)
-//	.
-//	.Field
-//	$
-//	'(' pipeline ')'
-// A term is a simple "expression".
-// A nil return means the next item is not a term.
-func (t *Tree) term() Node {
-	switch token := t.nextNonSpace(); token.typ {
-	case itemError:
-		t.errorf("%s", token.val)
-	case itemIdentifier:
-		if !t.hasFunction(token.val) {
-			t.errorf("function %q not defined", token.val)
-		}
-		return NewIdentifier(token.val).SetTree(t).SetPos(token.pos)
-	case itemDot:
-		return t.newDot(token.pos)
-	case itemNil:
-		return t.newNil(token.pos)
-	case itemVariable:
-		return t.useVar(token.pos, token.val)
-	case itemField:
-		return t.newField(token.pos, token.val)
-	case itemBool:
-		return t.newBool(token.pos, token.val == "true")
-	case itemCharConstant, itemComplex, itemNumber:
-		number, err := t.newNumber(token.pos, token.val, token.typ)
-		if err != nil {
-			t.error(err)
-		}
-		return number
-	case itemLeftParen:
-		pipe := t.pipeline("parenthesized pipeline")
-		if token := t.next(); token.typ != itemRightParen {
-			t.errorf("unclosed right paren: unexpected %s", token)
-		}
-		return pipe
-	case itemString, itemRawString:
-		s, err := strconv.Unquote(token.val)
-		if err != nil {
-			t.error(err)
-		}
-		return t.newString(token.pos, token.val, s)
-	}
-	t.backup()
-	return nil
-}
-
-// hasFunction reports if a function name exists in the Tree's maps.
-func (t *Tree) hasFunction(name string) bool {
-	for _, funcMap := range t.funcs {
-		if funcMap == nil {
-			continue
-		}
-		if funcMap[name] != nil {
-			return true
-		}
-	}
-	return false
-}
-
-// popVars trims the variable list to the specified length
-func (t *Tree) popVars(n int) {
-	t.vars = t.vars[:n]
-}
-
-// useVar returns a node for a variable reference. It errors if the
-// variable is not defined.
-func (t *Tree) useVar(pos Pos, name string) Node {
-	v := t.newVariable(pos, name)
-	for _, varName := range t.vars {
-		if varName == v.Ident[0] {
-			return v
-		}
-	}
-	t.errorf("undefined variable %q", v.Ident[0])
-	return nil
-}

vendor/github.com/alecthomas/template/template.go

@@ -1,218 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package template
-
-import (
-	"fmt"
-	"reflect"
-
-	"github.com/alecthomas/template/parse"
-)
-
-// common holds the information shared by related templates.
-type common struct {
-	tmpl map[string]*Template
-	// We use two maps, one for parsing and one for execution.
-	// This separation makes the API cleaner since it doesn't
-	// expose reflection to the client.
-	parseFuncs FuncMap
-	execFuncs  map[string]reflect.Value
-}
-
-// Template is the representation of a parsed template. The *parse.Tree
-// field is exported only for use by html/template and should be treated
-// as unexported by all other clients.
-type Template struct {
-	name string
-	*parse.Tree
-	*common
-	leftDelim  string
-	rightDelim string
-}
-
-// New allocates a new template with the given name.
-func New(name string) *Template {
-	return &Template{
-		name: name,
-	}
-}
-
-// Name returns the name of the template.
-func (t *Template) Name() string {
-	return t.name
-}
-
-// New allocates a new template associated with the given one and with the same
-// delimiters. The association, which is transitive, allows one template to
-// invoke another with a {{template}} action.
-func (t *Template) New(name string) *Template {
-	t.init()
-	return &Template{
-		name:       name,
-		common:     t.common,
-		leftDelim:  t.leftDelim,
-		rightDelim: t.rightDelim,
-	}
-}
-
-func (t *Template) init() {
-	if t.common == nil {
-		t.common = new(common)
-		t.tmpl = make(map[string]*Template)
-		t.parseFuncs = make(FuncMap)
-		t.execFuncs = make(map[string]reflect.Value)
-	}
-}
-
-// Clone returns a duplicate of the template, including all associated
-// templates. The actual representation is not copied, but the name space of
-// associated templates is, so further calls to Parse in the copy will add
-// templates to the copy but not to the original. Clone can be used to prepare
-// common templates and use them with variant definitions for other templates
-// by adding the variants after the clone is made.
-func (t *Template) Clone() (*Template, error) {
-	nt := t.copy(nil)
-	nt.init()
-	nt.tmpl[t.name] = nt
-	for k, v := range t.tmpl {
-		if k == t.name { // Already installed.
-			continue
-		}
-		// The associated templates share nt's common structure.
-		tmpl := v.copy(nt.common)
-		nt.tmpl[k] = tmpl
-	}
-	for k, v := range t.parseFuncs {
-		nt.parseFuncs[k] = v
-	}
-	for k, v := range t.execFuncs {
-		nt.execFuncs[k] = v
-	}
-	return nt, nil
-}
-
-// copy returns a shallow copy of t, with common set to the argument.
-func (t *Template) copy(c *common) *Template {
-	nt := New(t.name)
-	nt.Tree = t.Tree
-	nt.common = c
-	nt.leftDelim = t.leftDelim
-	nt.rightDelim = t.rightDelim
-	return nt
-}
-
-// AddParseTree creates a new template with the name and parse tree
-// and associates it with t.
-func (t *Template) AddParseTree(name string, tree *parse.Tree) (*Template, error) {
-	if t.common != nil && t.tmpl[name] != nil {
-		return nil, fmt.Errorf("template: redefinition of template %q", name)
-	}
-	nt := t.New(name)
-	nt.Tree = tree
-	t.tmpl[name] = nt
-	return nt, nil
-}
-
-// Templates returns a slice of the templates associated with t, including t
-// itself.
-func (t *Template) Templates() []*Template {
-	if t.common == nil {
-		return nil
-	}
-	// Return a slice so we don't expose the map.
-	m := make([]*Template, 0, len(t.tmpl))
-	for _, v := range t.tmpl {
-		m = append(m, v)
-	}
-	return m
-}
-
-// Delims sets the action delimiters to the specified strings, to be used in
-// subsequent calls to Parse, ParseFiles, or ParseGlob. Nested template
-// definitions will inherit the settings. An empty delimiter stands for the
-// corresponding default: {{ or }}.
-// The return value is the template, so calls can be chained.
-func (t *Template) Delims(left, right string) *Template {
-	t.leftDelim = left
-	t.rightDelim = right
-	return t
-}
-
-// Funcs adds the elements of the argument map to the template's function map.
-// It panics if a value in the map is not a function with appropriate return
-// type. However, it is legal to overwrite elements of the map. The return
-// value is the template, so calls can be chained.
-func (t *Template) Funcs(funcMap FuncMap) *Template {
-	t.init()
-	addValueFuncs(t.execFuncs, funcMap)
-	addFuncs(t.parseFuncs, funcMap)
-	return t
-}
-
-// Lookup returns the template with the given name that is associated with t,
-// or nil if there is no such template.
-func (t *Template) Lookup(name string) *Template {
-	if t.common == nil {
-		return nil
-	}
-	return t.tmpl[name]
-}
-
-// Parse parses a string into a template. Nested template definitions will be
-// associated with the top-level template t. Parse may be called multiple times
-// to parse definitions of templates to associate with t. It is an error if a
-// resulting template is non-empty (contains content other than template
-// definitions) and would replace a non-empty template with the same name.
-// (In multiple calls to Parse with the same receiver template, only one call
-// can contain text other than space, comments, and template definitions.)
-func (t *Template) Parse(text string) (*Template, error) {
-	t.init()
-	trees, err := parse.Parse(t.name, text, t.leftDelim, t.rightDelim, t.parseFuncs, builtins)
-	if err != nil {
-		return nil, err
-	}
-	// Add the newly parsed trees, including the one for t, into our common structure.
-	for name, tree := range trees {
-		// If the name we parsed is the name of this template, overwrite this template.
-		// The associate method checks it's not a redefinition.
-		tmpl := t
-		if name != t.name {
-			tmpl = t.New(name)
-		}
-		// Even if t == tmpl, we need to install it in the common.tmpl map.
-		if replace, err := t.associate(tmpl, tree); err != nil {
-			return nil, err
-		} else if replace {
-			tmpl.Tree = tree
-		}
-		tmpl.leftDelim = t.leftDelim
-		tmpl.rightDelim = t.rightDelim
-	}
-	return t, nil
-}
-
-// associate installs the new template into the group of templates associated
-// with t. It is an error to reuse a name except to overwrite an empty
-// template. The two are already known to share the common structure.
-// The boolean return value reports wither to store this tree as t.Tree.
-func (t *Template) associate(new *Template, tree *parse.Tree) (bool, error) {
-	if new.common != t.common {
-		panic("internal error: associate not common")
-	}
-	name := new.name
-	if old := t.tmpl[name]; old != nil {
-		oldIsEmpty := parse.IsEmptyTree(old.Root)
-		newIsEmpty := parse.IsEmptyTree(tree.Root)
-		if newIsEmpty {
-			// Whether old is empty or not, new is empty; no reason to replace old.
-			return false, nil
-		}
-		if !oldIsEmpty {
-			return false, fmt.Errorf("template: redefinition of template %q", name)
-		}
-	}
-	t.tmpl[name] = new
-	return true, nil
-}

vendor/github.com/alecthomas/units/COPYING

@@ -1,19 +0,0 @@
-Copyright (C) 2014 Alec Thomas
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

vendor/github.com/alecthomas/units/README.md

@@ -1,11 +0,0 @@
-# Units - Helpful unit multipliers and functions for Go
-
-The goal of this package is to have functionality similar to the [time](http://golang.org/pkg/time/) package.
-
-It allows for code like this:
-
-```go
-n, err := ParseBase2Bytes("1KB")
-// n == 1024
-n = units.Mebibyte * 512
-```

vendor/github.com/alecthomas/units/bytes.go

@@ -1,83 +0,0 @@
-package units
-
-// Base2Bytes is the old non-SI power-of-2 byte scale (1024 bytes in a kilobyte,
-// etc.).
-type Base2Bytes int64
-
-// Base-2 byte units.
-const (
-	Kibibyte Base2Bytes = 1024
-	KiB                 = Kibibyte
-	Mebibyte            = Kibibyte * 1024
-	MiB                 = Mebibyte
-	Gibibyte            = Mebibyte * 1024
-	GiB                 = Gibibyte
-	Tebibyte            = Gibibyte * 1024
-	TiB                 = Tebibyte
-	Pebibyte            = Tebibyte * 1024
-	PiB                 = Pebibyte
-	Exbibyte            = Pebibyte * 1024
-	EiB                 = Exbibyte
-)
-
-var (
-	bytesUnitMap    = MakeUnitMap("iB", "B", 1024)
-	oldBytesUnitMap = MakeUnitMap("B", "B", 1024)
-)
-
-// ParseBase2Bytes supports both iB and B in base-2 multipliers. That is, KB
-// and KiB are both 1024.
-func ParseBase2Bytes(s string) (Base2Bytes, error) {
-	n, err := ParseUnit(s, bytesUnitMap)
-	if err != nil {
-		n, err = ParseUnit(s, oldBytesUnitMap)
-	}
-	return Base2Bytes(n), err
-}
-
-func (b Base2Bytes) String() string {
-	return ToString(int64(b), 1024, "iB", "B")
-}
-
-var (
-	metricBytesUnitMap = MakeUnitMap("B", "B", 1000)
-)
-
-// MetricBytes are SI byte units (1000 bytes in a kilobyte).
-type MetricBytes SI
-
-// SI base-10 byte units.
-const (
-	Kilobyte MetricBytes = 1000
-	KB                   = Kilobyte
-	Megabyte             = Kilobyte * 1000
-	MB                   = Megabyte
-	Gigabyte             = Megabyte * 1000
-	GB                   = Gigabyte
-	Terabyte             = Gigabyte * 1000
-	TB                   = Terabyte
-	Petabyte             = Terabyte * 1000
-	PB                   = Petabyte
-	Exabyte              = Petabyte * 1000
-	EB                   = Exabyte
-)
-
-// ParseMetricBytes parses base-10 metric byte units. That is, KB is 1000 bytes.
-func ParseMetricBytes(s string) (MetricBytes, error) {
-	n, err := ParseUnit(s, metricBytesUnitMap)
-	return MetricBytes(n), err
-}
-
-func (m MetricBytes) String() string {
-	return ToString(int64(m), 1000, "B", "B")
-}
-
-// ParseStrictBytes supports both iB and B suffixes for base 2 and metric,
-// respectively. That is, KiB represents 1024 and KB represents 1000.
-func ParseStrictBytes(s string) (int64, error) {
-	n, err := ParseUnit(s, bytesUnitMap)
-	if err != nil {
-		n, err = ParseUnit(s, metricBytesUnitMap)
-	}
-	return int64(n), err
-}

vendor/github.com/alecthomas/units/doc.go

@@ -1,13 +0,0 @@
-// Package units provides helpful unit multipliers and functions for Go.
-//
-// The goal of this package is to have functionality similar to the time [1] package.
-//
-//
-// [1] http://golang.org/pkg/time/
-//
-// It allows for code like this:
-//
-//     n, err := ParseBase2Bytes("1KB")
-//     // n == 1024
-//     n = units.Mebibyte * 512
-package units

vendor/github.com/alecthomas/units/si.go

@@ -1,26 +0,0 @@
-package units
-
-// SI units.
-type SI int64
-
-// SI unit multiples.
-const (
-	Kilo SI = 1000
-	Mega    = Kilo * 1000
-	Giga    = Mega * 1000
-	Tera    = Giga * 1000
-	Peta    = Tera * 1000
-	Exa     = Peta * 1000
-)
-
-func MakeUnitMap(suffix, shortSuffix string, scale int64) map[string]float64 {
-	return map[string]float64{
-		shortSuffix:  1,
-		"K" + suffix: float64(scale),
-		"M" + suffix: float64(scale * scale),
-		"G" + suffix: float64(scale * scale * scale),
-		"T" + suffix: float64(scale * scale * scale * scale),
-		"P" + suffix: float64(scale * scale * scale * scale * scale),
-		"E" + suffix: float64(scale * scale * scale * scale * scale * scale),
-	}
-}

vendor/github.com/alecthomas/units/util.go

@@ -1,138 +0,0 @@
-package units
-
-import (
-	"errors"
-	"fmt"
-	"strings"
-)
-
-var (
-	siUnits = []string{"", "K", "M", "G", "T", "P", "E"}
-)
-
-func ToString(n int64, scale int64, suffix, baseSuffix string) string {
-	mn := len(siUnits)
-	out := make([]string, mn)
-	for i, m := range siUnits {
-		if n%scale != 0 || i == 0 && n == 0 {
-			s := suffix
-			if i == 0 {
-				s = baseSuffix
-			}
-			out[mn-1-i] = fmt.Sprintf("%d%s%s", n%scale, m, s)
-		}
-		n /= scale
-		if n == 0 {
-			break
-		}
-	}
-	return strings.Join(out, "")
-}
-
-// Below code ripped straight from http://golang.org/src/pkg/time/format.go?s=33392:33438#L1123
-var errLeadingInt = errors.New("units: bad [0-9]*") // never printed
-
-// leadingInt consumes the leading [0-9]* from s.
-func leadingInt(s string) (x int64, rem string, err error) {
-	i := 0
-	for ; i < len(s); i++ {
-		c := s[i]
-		if c < '0' || c > '9' {
-			break
-		}
-		if x >= (1<<63-10)/10 {
-			// overflow
-			return 0, "", errLeadingInt
-		}
-		x = x*10 + int64(c) - '0'
-	}
-	return x, s[i:], nil
-}
-
-func ParseUnit(s string, unitMap map[string]float64) (int64, error) {
-	// [-+]?([0-9]*(\.[0-9]*)?[a-z]+)+
-	orig := s
-	f := float64(0)
-	neg := false
-
-	// Consume [-+]?
-	if s != "" {
-		c := s[0]
-		if c == '-' || c == '+' {
-			neg = c == '-'
-			s = s[1:]
-		}
-	}
-	// Special case: if all that is left is "0", this is zero.
-	if s == "0" {
-		return 0, nil
-	}
-	if s == "" {
-		return 0, errors.New("units: invalid " + orig)
-	}
-	for s != "" {
-		g := float64(0) // this element of the sequence
-
-		var x int64
-		var err error
-
-		// The next character must be [0-9.]
-		if !(s[0] == '.' || ('0' <= s[0] && s[0] <= '9')) {
-			return 0, errors.New("units: invalid " + orig)
-		}
-		// Consume [0-9]*
-		pl := len(s)
-		x, s, err = leadingInt(s)
-		if err != nil {
-			return 0, errors.New("units: invalid " + orig)
-		}
-		g = float64(x)
-		pre := pl != len(s) // whether we consumed anything before a period
-
-		// Consume (\.[0-9]*)?
-		post := false
-		if s != "" && s[0] == '.' {
-			s = s[1:]
-			pl := len(s)
-			x, s, err = leadingInt(s)
-			if err != nil {
-				return 0, errors.New("units: invalid " + orig)
-			}
-			scale := 1.0
-			for n := pl - len(s); n > 0; n-- {
-				scale *= 10
-			}
-			g += float64(x) / scale
-			post = pl != len(s)
-		}
-		if !pre && !post {
-			// no digits (e.g. ".s" or "-.s")
-			return 0, errors.New("units: invalid " + orig)
-		}
-
-		// Consume unit.
-		i := 0
-		for ; i < len(s); i++ {
-			c := s[i]
-			if c == '.' || ('0' <= c && c <= '9') {
-				break
-			}
-		}
-		u := s[:i]
-		s = s[i:]
-		unit, ok := unitMap[u]
-		if !ok {
-			return 0, errors.New("units: unknown unit " + u + " in " + orig)
-		}
-
-		f += g * unit
-	}
-
-	if neg {
-		f = -f
-	}
-	if f < float64(-1<<63) || f > float64(1<<63-1) {
-		return 0, errors.New("units: overflow parsing unit")
-	}
-	return int64(f), nil
-}

vendor/github.com/beorn7/perks/LICENSE

@@ -1,20 +0,0 @@
-Copyright (C) 2013 Blake Mizerany
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/beorn7/perks/quantile/stream.go

@@ -1,316 +0,0 @@
-// Package quantile computes approximate quantiles over an unbounded data
-// stream within low memory and CPU bounds.
-//
-// A small amount of accuracy is traded to achieve the above properties.
-//
-// Multiple streams can be merged before calling Query to generate a single set
-// of results. This is meaningful when the streams represent the same type of
-// data. See Merge and Samples.
-//
-// For more detailed information about the algorithm used, see:
-//
-// Effective Computation of Biased Quantiles over Data Streams
-//
-// http://www.cs.rutgers.edu/~muthu/bquant.pdf
-package quantile
-
-import (
-	"math"
-	"sort"
-)
-
-// Sample holds an observed value and meta information for compression. JSON
-// tags have been added for convenience.
-type Sample struct {
-	Value float64 `json:",string"`
-	Width float64 `json:",string"`
-	Delta float64 `json:",string"`
-}
-
-// Samples represents a slice of samples. It implements sort.Interface.
-type Samples []Sample
-
-func (a Samples) Len() int           { return len(a) }
-func (a Samples) Less(i, j int) bool { return a[i].Value < a[j].Value }
-func (a Samples) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
-
-type invariant func(s *stream, r float64) float64
-
-// NewLowBiased returns an initialized Stream for low-biased quantiles
-// (e.g. 0.01, 0.1, 0.5) where the needed quantiles are not known a priori, but
-// error guarantees can still be given even for the lower ranks of the data
-// distribution.
-//
-// The provided epsilon is a relative error, i.e. the true quantile of a value
-// returned by a query is guaranteed to be within (1±Epsilon)*Quantile.
-//
-// See http://www.cs.rutgers.edu/~muthu/bquant.pdf for time, space, and error
-// properties.
-func NewLowBiased(epsilon float64) *Stream {
-	ƒ := func(s *stream, r float64) float64 {
-		return 2 * epsilon * r
-	}
-	return newStream(ƒ)
-}
-
-// NewHighBiased returns an initialized Stream for high-biased quantiles
-// (e.g. 0.01, 0.1, 0.5) where the needed quantiles are not known a priori, but
-// error guarantees can still be given even for the higher ranks of the data
-// distribution.
-//
-// The provided epsilon is a relative error, i.e. the true quantile of a value
-// returned by a query is guaranteed to be within 1-(1±Epsilon)*(1-Quantile).
-//
-// See http://www.cs.rutgers.edu/~muthu/bquant.pdf for time, space, and error
-// properties.
-func NewHighBiased(epsilon float64) *Stream {
-	ƒ := func(s *stream, r float64) float64 {
-		return 2 * epsilon * (s.n - r)
-	}
-	return newStream(ƒ)
-}
-
-// NewTargeted returns an initialized Stream concerned with a particular set of
-// quantile values that are supplied a priori. Knowing these a priori reduces
-// space and computation time. The targets map maps the desired quantiles to
-// their absolute errors, i.e. the true quantile of a value returned by a query
-// is guaranteed to be within (Quantile±Epsilon).
-//
-// See http://www.cs.rutgers.edu/~muthu/bquant.pdf for time, space, and error properties.
-func NewTargeted(targetMap map[float64]float64) *Stream {
-	// Convert map to slice to avoid slow iterations on a map.
-	// ƒ is called on the hot path, so converting the map to a slice
-	// beforehand results in significant CPU savings.
-	targets := targetMapToSlice(targetMap)
-
-	ƒ := func(s *stream, r float64) float64 {
-		var m = math.MaxFloat64
-		var f float64
-		for _, t := range targets {
-			if t.quantile*s.n <= r {
-				f = (2 * t.epsilon * r) / t.quantile
-			} else {
-				f = (2 * t.epsilon * (s.n - r)) / (1 - t.quantile)
-			}
-			if f < m {
-				m = f
-			}
-		}
-		return m
-	}
-	return newStream(ƒ)
-}
-
-type target struct {
-	quantile float64
-	epsilon  float64
-}
-
-func targetMapToSlice(targetMap map[float64]float64) []target {
-	targets := make([]target, 0, len(targetMap))
-
-	for quantile, epsilon := range targetMap {
-		t := target{
-			quantile: quantile,
-			epsilon:  epsilon,
-		}
-		targets = append(targets, t)
-	}
-
-	return targets
-}
-
-// Stream computes quantiles for a stream of float64s. It is not thread-safe by
-// design. Take care when using across multiple goroutines.
-type Stream struct {
-	*stream
-	b      Samples
-	sorted bool
-}
-
-func newStream(ƒ invariant) *Stream {
-	x := &stream{ƒ: ƒ}
-	return &Stream{x, make(Samples, 0, 500), true}
-}
-
-// Insert inserts v into the stream.
-func (s *Stream) Insert(v float64) {
-	s.insert(Sample{Value: v, Width: 1})
-}
-
-func (s *Stream) insert(sample Sample) {
-	s.b = append(s.b, sample)
-	s.sorted = false
-	if len(s.b) == cap(s.b) {
-		s.flush()
-	}
-}
-
-// Query returns the computed qth percentiles value. If s was created with
-// NewTargeted, and q is not in the set of quantiles provided a priori, Query
-// will return an unspecified result.
-func (s *Stream) Query(q float64) float64 {
-	if !s.flushed() {
-		// Fast path when there hasn't been enough data for a flush;
-		// this also yields better accuracy for small sets of data.
-		l := len(s.b)
-		if l == 0 {
-			return 0
-		}
-		i := int(math.Ceil(float64(l) * q))
-		if i > 0 {
-			i -= 1
-		}
-		s.maybeSort()
-		return s.b[i].Value
-	}
-	s.flush()
-	return s.stream.query(q)
-}
-
-// Merge merges samples into the underlying streams samples. This is handy when
-// merging multiple streams from separate threads, database shards, etc.
-//
-// ATTENTION: This method is broken and does not yield correct results. The
-// underlying algorithm is not capable of merging streams correctly.
-func (s *Stream) Merge(samples Samples) {
-	sort.Sort(samples)
-	s.stream.merge(samples)
-}
-
-// Reset reinitializes and clears the list reusing the samples buffer memory.
-func (s *Stream) Reset() {
-	s.stream.reset()
-	s.b = s.b[:0]
-}
-
-// Samples returns stream samples held by s.
-func (s *Stream) Samples() Samples {
-	if !s.flushed() {
-		return s.b
-	}
-	s.flush()
-	return s.stream.samples()
-}
-
-// Count returns the total number of samples observed in the stream
-// since initialization.
-func (s *Stream) Count() int {
-	return len(s.b) + s.stream.count()
-}
-
-func (s *Stream) flush() {
-	s.maybeSort()
-	s.stream.merge(s.b)
-	s.b = s.b[:0]
-}
-
-func (s *Stream) maybeSort() {
-	if !s.sorted {
-		s.sorted = true
-		sort.Sort(s.b)
-	}
-}
-
-func (s *Stream) flushed() bool {
-	return len(s.stream.l) > 0
-}
-
-type stream struct {
-	n float64
-	l []Sample
-	ƒ invariant
-}
-
-func (s *stream) reset() {
-	s.l = s.l[:0]
-	s.n = 0
-}
-
-func (s *stream) insert(v float64) {
-	s.merge(Samples{{v, 1, 0}})
-}
-
-func (s *stream) merge(samples Samples) {
-	// TODO(beorn7): This tries to merge not only individual samples, but
-	// whole summaries. The paper doesn't mention merging summaries at
-	// all. Unittests show that the merging is inaccurate. Find out how to
-	// do merges properly.
-	var r float64
-	i := 0
-	for _, sample := range samples {
-		for ; i < len(s.l); i++ {
-			c := s.l[i]
-			if c.Value > sample.Value {
-				// Insert at position i.
-				s.l = append(s.l, Sample{})
-				copy(s.l[i+1:], s.l[i:])
-				s.l[i] = Sample{
-					sample.Value,
-					sample.Width,
-					math.Max(sample.Delta, math.Floor(s.ƒ(s, r))-1),
-					// TODO(beorn7): How to calculate delta correctly?
-				}
-				i++
-				goto inserted
-			}
-			r += c.Width
-		}
-		s.l = append(s.l, Sample{sample.Value, sample.Width, 0})
-		i++
-	inserted:
-		s.n += sample.Width
-		r += sample.Width
-	}
-	s.compress()
-}
-
-func (s *stream) count() int {
-	return int(s.n)
-}
-
-func (s *stream) query(q float64) float64 {
-	t := math.Ceil(q * s.n)
-	t += math.Ceil(s.ƒ(s, t) / 2)
-	p := s.l[0]
-	var r float64
-	for _, c := range s.l[1:] {
-		r += p.Width
-		if r+c.Width+c.Delta > t {
-			return p.Value
-		}
-		p = c
-	}
-	return p.Value
-}
-
-func (s *stream) compress() {
-	if len(s.l) < 2 {
-		return
-	}
-	x := s.l[len(s.l)-1]
-	xi := len(s.l) - 1
-	r := s.n - 1 - x.Width
-
-	for i := len(s.l) - 2; i >= 0; i-- {
-		c := s.l[i]
-		if c.Width+x.Width+x.Delta <= s.ƒ(s, r) {
-			x.Width += c.Width
-			s.l[xi] = x
-			// Remove element at i.
-			copy(s.l[i:], s.l[i+1:])
-			s.l = s.l[:len(s.l)-1]
-			xi -= 1
-		} else {
-			x = c
-			xi = i
-		}
-		r -= c.Width
-	}
-}
-
-func (s *stream) samples() Samples {
-	samples := make(Samples, len(s.l))
-	copy(samples, s.l)
-	return samples
-}

vendor/github.com/golang/protobuf/AUTHORS

@@ -1,3 +0,0 @@
-# This source code refers to The Go Authors for copyright purposes.
-# The master list of authors is in the main Go distribution,
-# visible at http://tip.golang.org/AUTHORS.

vendor/github.com/golang/protobuf/CONTRIBUTORS

@@ -1,3 +0,0 @@
-# This source code was written by the Go contributors.
-# The master list of contributors is in the main Go distribution,
-# visible at http://tip.golang.org/CONTRIBUTORS.

vendor/github.com/golang/protobuf/LICENSE

@@ -1,28 +0,0 @@
-Copyright 2010 The Go Authors.  All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-    * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-    * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-

vendor/github.com/golang/protobuf/proto/clone.go

@@ -1,253 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2011 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Protocol buffer deep copy and merge.
-// TODO: RawMessage.
-
-package proto
-
-import (
-	"fmt"
-	"log"
-	"reflect"
-	"strings"
-)
-
-// Clone returns a deep copy of a protocol buffer.
-func Clone(src Message) Message {
-	in := reflect.ValueOf(src)
-	if in.IsNil() {
-		return src
-	}
-	out := reflect.New(in.Type().Elem())
-	dst := out.Interface().(Message)
-	Merge(dst, src)
-	return dst
-}
-
-// Merger is the interface representing objects that can merge messages of the same type.
-type Merger interface {
-	// Merge merges src into this message.
-	// Required and optional fields that are set in src will be set to that value in dst.
-	// Elements of repeated fields will be appended.
-	//
-	// Merge may panic if called with a different argument type than the receiver.
-	Merge(src Message)
-}
-
-// generatedMerger is the custom merge method that generated protos will have.
-// We must add this method since a generate Merge method will conflict with
-// many existing protos that have a Merge data field already defined.
-type generatedMerger interface {
-	XXX_Merge(src Message)
-}
-
-// Merge merges src into dst.
-// Required and optional fields that are set in src will be set to that value in dst.
-// Elements of repeated fields will be appended.
-// Merge panics if src and dst are not the same type, or if dst is nil.
-func Merge(dst, src Message) {
-	if m, ok := dst.(Merger); ok {
-		m.Merge(src)
-		return
-	}
-
-	in := reflect.ValueOf(src)
-	out := reflect.ValueOf(dst)
-	if out.IsNil() {
-		panic("proto: nil destination")
-	}
-	if in.Type() != out.Type() {
-		panic(fmt.Sprintf("proto.Merge(%T, %T) type mismatch", dst, src))
-	}
-	if in.IsNil() {
-		return // Merge from nil src is a noop
-	}
-	if m, ok := dst.(generatedMerger); ok {
-		m.XXX_Merge(src)
-		return
-	}
-	mergeStruct(out.Elem(), in.Elem())
-}
-
-func mergeStruct(out, in reflect.Value) {
-	sprop := GetProperties(in.Type())
-	for i := 0; i < in.NumField(); i++ {
-		f := in.Type().Field(i)
-		if strings.HasPrefix(f.Name, "XXX_") {
-			continue
-		}
-		mergeAny(out.Field(i), in.Field(i), false, sprop.Prop[i])
-	}
-
-	if emIn, err := extendable(in.Addr().Interface()); err == nil {
-		emOut, _ := extendable(out.Addr().Interface())
-		mIn, muIn := emIn.extensionsRead()
-		if mIn != nil {
-			mOut := emOut.extensionsWrite()
-			muIn.Lock()
-			mergeExtension(mOut, mIn)
-			muIn.Unlock()
-		}
-	}
-
-	uf := in.FieldByName("XXX_unrecognized")
-	if !uf.IsValid() {
-		return
-	}
-	uin := uf.Bytes()
-	if len(uin) > 0 {
-		out.FieldByName("XXX_unrecognized").SetBytes(append([]byte(nil), uin...))
-	}
-}
-
-// mergeAny performs a merge between two values of the same type.
-// viaPtr indicates whether the values were indirected through a pointer (implying proto2).
-// prop is set if this is a struct field (it may be nil).
-func mergeAny(out, in reflect.Value, viaPtr bool, prop *Properties) {
-	if in.Type() == protoMessageType {
-		if !in.IsNil() {
-			if out.IsNil() {
-				out.Set(reflect.ValueOf(Clone(in.Interface().(Message))))
-			} else {
-				Merge(out.Interface().(Message), in.Interface().(Message))
-			}
-		}
-		return
-	}
-	switch in.Kind() {
-	case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64,
-		reflect.String, reflect.Uint32, reflect.Uint64:
-		if !viaPtr && isProto3Zero(in) {
-			return
-		}
-		out.Set(in)
-	case reflect.Interface:
-		// Probably a oneof field; copy non-nil values.
-		if in.IsNil() {
-			return
-		}
-		// Allocate destination if it is not set, or set to a different type.
-		// Otherwise we will merge as normal.
-		if out.IsNil() || out.Elem().Type() != in.Elem().Type() {
-			out.Set(reflect.New(in.Elem().Elem().Type())) // interface -> *T -> T -> new(T)
-		}
-		mergeAny(out.Elem(), in.Elem(), false, nil)
-	case reflect.Map:
-		if in.Len() == 0 {
-			return
-		}
-		if out.IsNil() {
-			out.Set(reflect.MakeMap(in.Type()))
-		}
-		// For maps with value types of *T or []byte we need to deep copy each value.
-		elemKind := in.Type().Elem().Kind()
-		for _, key := range in.MapKeys() {
-			var val reflect.Value
-			switch elemKind {
-			case reflect.Ptr:
-				val = reflect.New(in.Type().Elem().Elem())
-				mergeAny(val, in.MapIndex(key), false, nil)
-			case reflect.Slice:
-				val = in.MapIndex(key)
-				val = reflect.ValueOf(append([]byte{}, val.Bytes()...))
-			default:
-				val = in.MapIndex(key)
-			}
-			out.SetMapIndex(key, val)
-		}
-	case reflect.Ptr:
-		if in.IsNil() {
-			return
-		}
-		if out.IsNil() {
-			out.Set(reflect.New(in.Elem().Type()))
-		}
-		mergeAny(out.Elem(), in.Elem(), true, nil)
-	case reflect.Slice:
-		if in.IsNil() {
-			return
-		}
-		if in.Type().Elem().Kind() == reflect.Uint8 {
-			// []byte is a scalar bytes field, not a repeated field.
-
-			// Edge case: if this is in a proto3 message, a zero length
-			// bytes field is considered the zero value, and should not
-			// be merged.
-			if prop != nil && prop.proto3 && in.Len() == 0 {
-				return
-			}
-
-			// Make a deep copy.
-			// Append to []byte{} instead of []byte(nil) so that we never end up
-			// with a nil result.
-			out.SetBytes(append([]byte{}, in.Bytes()...))
-			return
-		}
-		n := in.Len()
-		if out.IsNil() {
-			out.Set(reflect.MakeSlice(in.Type(), 0, n))
-		}
-		switch in.Type().Elem().Kind() {
-		case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64,
-			reflect.String, reflect.Uint32, reflect.Uint64:
-			out.Set(reflect.AppendSlice(out, in))
-		default:
-			for i := 0; i < n; i++ {
-				x := reflect.Indirect(reflect.New(in.Type().Elem()))
-				mergeAny(x, in.Index(i), false, nil)
-				out.Set(reflect.Append(out, x))
-			}
-		}
-	case reflect.Struct:
-		mergeStruct(out, in)
-	default:
-		// unknown type, so not a protocol buffer
-		log.Printf("proto: don't know how to copy %v", in)
-	}
-}
-
-func mergeExtension(out, in map[int32]Extension) {
-	for extNum, eIn := range in {
-		eOut := Extension{desc: eIn.desc}
-		if eIn.value != nil {
-			v := reflect.New(reflect.TypeOf(eIn.value)).Elem()
-			mergeAny(v, reflect.ValueOf(eIn.value), false, nil)
-			eOut.value = v.Interface()
-		}
-		if eIn.enc != nil {
-			eOut.enc = make([]byte, len(eIn.enc))
-			copy(eOut.enc, eIn.enc)
-		}
-
-		out[extNum] = eOut
-	}
-}

vendor/github.com/golang/protobuf/proto/decode.go

@@ -1,428 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package proto
-
-/*
- * Routines for decoding protocol buffer data to construct in-memory representations.
- */
-
-import (
-	"errors"
-	"fmt"
-	"io"
-)
-
-// errOverflow is returned when an integer is too large to be represented.
-var errOverflow = errors.New("proto: integer overflow")
-
-// ErrInternalBadWireType is returned by generated code when an incorrect
-// wire type is encountered. It does not get returned to user code.
-var ErrInternalBadWireType = errors.New("proto: internal error: bad wiretype for oneof")
-
-// DecodeVarint reads a varint-encoded integer from the slice.
-// It returns the integer and the number of bytes consumed, or
-// zero if there is not enough.
-// This is the format for the
-// int32, int64, uint32, uint64, bool, and enum
-// protocol buffer types.
-func DecodeVarint(buf []byte) (x uint64, n int) {
-	for shift := uint(0); shift < 64; shift += 7 {
-		if n >= len(buf) {
-			return 0, 0
-		}
-		b := uint64(buf[n])
-		n++
-		x |= (b & 0x7F) << shift
-		if (b & 0x80) == 0 {
-			return x, n
-		}
-	}
-
-	// The number is too large to represent in a 64-bit value.
-	return 0, 0
-}
-
-func (p *Buffer) decodeVarintSlow() (x uint64, err error) {
-	i := p.index
-	l := len(p.buf)
-
-	for shift := uint(0); shift < 64; shift += 7 {
-		if i >= l {
-			err = io.ErrUnexpectedEOF
-			return
-		}
-		b := p.buf[i]
-		i++
-		x |= (uint64(b) & 0x7F) << shift
-		if b < 0x80 {
-			p.index = i
-			return
-		}
-	}
-
-	// The number is too large to represent in a 64-bit value.
-	err = errOverflow
-	return
-}
-
-// DecodeVarint reads a varint-encoded integer from the Buffer.
-// This is the format for the
-// int32, int64, uint32, uint64, bool, and enum
-// protocol buffer types.
-func (p *Buffer) DecodeVarint() (x uint64, err error) {
-	i := p.index
-	buf := p.buf
-
-	if i >= len(buf) {
-		return 0, io.ErrUnexpectedEOF
-	} else if buf[i] < 0x80 {
-		p.index++
-		return uint64(buf[i]), nil
-	} else if len(buf)-i < 10 {
-		return p.decodeVarintSlow()
-	}
-
-	var b uint64
-	// we already checked the first byte
-	x = uint64(buf[i]) - 0x80
-	i++
-
-	b = uint64(buf[i])
-	i++
-	x += b << 7
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 7
-
-	b = uint64(buf[i])
-	i++
-	x += b << 14
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 14
-
-	b = uint64(buf[i])
-	i++
-	x += b << 21
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 21
-
-	b = uint64(buf[i])
-	i++
-	x += b << 28
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 28
-
-	b = uint64(buf[i])
-	i++
-	x += b << 35
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 35
-
-	b = uint64(buf[i])
-	i++
-	x += b << 42
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 42
-
-	b = uint64(buf[i])
-	i++
-	x += b << 49
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 49
-
-	b = uint64(buf[i])
-	i++
-	x += b << 56
-	if b&0x80 == 0 {
-		goto done
-	}
-	x -= 0x80 << 56
-
-	b = uint64(buf[i])
-	i++
-	x += b << 63
-	if b&0x80 == 0 {
-		goto done
-	}
-	// x -= 0x80 << 63 // Always zero.
-
-	return 0, errOverflow
-
-done:
-	p.index = i
-	return x, nil
-}
-
-// DecodeFixed64 reads a 64-bit integer from the Buffer.
-// This is the format for the
-// fixed64, sfixed64, and double protocol buffer types.
-func (p *Buffer) DecodeFixed64() (x uint64, err error) {
-	// x, err already 0
-	i := p.index + 8
-	if i < 0 || i > len(p.buf) {
-		err = io.ErrUnexpectedEOF
-		return
-	}
-	p.index = i
-
-	x = uint64(p.buf[i-8])
-	x |= uint64(p.buf[i-7]) << 8
-	x |= uint64(p.buf[i-6]) << 16
-	x |= uint64(p.buf[i-5]) << 24
-	x |= uint64(p.buf[i-4]) << 32
-	x |= uint64(p.buf[i-3]) << 40
-	x |= uint64(p.buf[i-2]) << 48
-	x |= uint64(p.buf[i-1]) << 56
-	return
-}
-
-// DecodeFixed32 reads a 32-bit integer from the Buffer.
-// This is the format for the
-// fixed32, sfixed32, and float protocol buffer types.
-func (p *Buffer) DecodeFixed32() (x uint64, err error) {
-	// x, err already 0
-	i := p.index + 4
-	if i < 0 || i > len(p.buf) {
-		err = io.ErrUnexpectedEOF
-		return
-	}
-	p.index = i
-
-	x = uint64(p.buf[i-4])
-	x |= uint64(p.buf[i-3]) << 8
-	x |= uint64(p.buf[i-2]) << 16
-	x |= uint64(p.buf[i-1]) << 24
-	return
-}
-
-// DecodeZigzag64 reads a zigzag-encoded 64-bit integer
-// from the Buffer.
-// This is the format used for the sint64 protocol buffer type.
-func (p *Buffer) DecodeZigzag64() (x uint64, err error) {
-	x, err = p.DecodeVarint()
-	if err != nil {
-		return
-	}
-	x = (x >> 1) ^ uint64((int64(x&1)<<63)>>63)
-	return
-}
-
-// DecodeZigzag32 reads a zigzag-encoded 32-bit integer
-// from  the Buffer.
-// This is the format used for the sint32 protocol buffer type.
-func (p *Buffer) DecodeZigzag32() (x uint64, err error) {
-	x, err = p.DecodeVarint()
-	if err != nil {
-		return
-	}
-	x = uint64((uint32(x) >> 1) ^ uint32((int32(x&1)<<31)>>31))
-	return
-}
-
-// DecodeRawBytes reads a count-delimited byte buffer from the Buffer.
-// This is the format used for the bytes protocol buffer
-// type and for embedded messages.
-func (p *Buffer) DecodeRawBytes(alloc bool) (buf []byte, err error) {
-	n, err := p.DecodeVarint()
-	if err != nil {
-		return nil, err
-	}
-
-	nb := int(n)
-	if nb < 0 {
-		return nil, fmt.Errorf("proto: bad byte length %d", nb)
-	}
-	end := p.index + nb
-	if end < p.index || end > len(p.buf) {
-		return nil, io.ErrUnexpectedEOF
-	}
-
-	if !alloc {
-		// todo: check if can get more uses of alloc=false
-		buf = p.buf[p.index:end]
-		p.index += nb
-		return
-	}
-
-	buf = make([]byte, nb)
-	copy(buf, p.buf[p.index:])
-	p.index += nb
-	return
-}
-
-// DecodeStringBytes reads an encoded string from the Buffer.
-// This is the format used for the proto2 string type.
-func (p *Buffer) DecodeStringBytes() (s string, err error) {
-	buf, err := p.DecodeRawBytes(false)
-	if err != nil {
-		return
-	}
-	return string(buf), nil
-}
-
-// Unmarshaler is the interface representing objects that can
-// unmarshal themselves.  The argument points to data that may be
-// overwritten, so implementations should not keep references to the
-// buffer.
-// Unmarshal implementations should not clear the receiver.
-// Any unmarshaled data should be merged into the receiver.
-// Callers of Unmarshal that do not want to retain existing data
-// should Reset the receiver before calling Unmarshal.
-type Unmarshaler interface {
-	Unmarshal([]byte) error
-}
-
-// newUnmarshaler is the interface representing objects that can
-// unmarshal themselves. The semantics are identical to Unmarshaler.
-//
-// This exists to support protoc-gen-go generated messages.
-// The proto package will stop type-asserting to this interface in the future.
-//
-// DO NOT DEPEND ON THIS.
-type newUnmarshaler interface {
-	XXX_Unmarshal([]byte) error
-}
-
-// Unmarshal parses the protocol buffer representation in buf and places the
-// decoded result in pb.  If the struct underlying pb does not match
-// the data in buf, the results can be unpredictable.
-//
-// Unmarshal resets pb before starting to unmarshal, so any
-// existing data in pb is always removed. Use UnmarshalMerge
-// to preserve and append to existing data.
-func Unmarshal(buf []byte, pb Message) error {
-	pb.Reset()
-	if u, ok := pb.(newUnmarshaler); ok {
-		return u.XXX_Unmarshal(buf)
-	}
-	if u, ok := pb.(Unmarshaler); ok {
-		return u.Unmarshal(buf)
-	}
-	return NewBuffer(buf).Unmarshal(pb)
-}
-
-// UnmarshalMerge parses the protocol buffer representation in buf and
-// writes the decoded result to pb.  If the struct underlying pb does not match
-// the data in buf, the results can be unpredictable.
-//
-// UnmarshalMerge merges into existing data in pb.
-// Most code should use Unmarshal instead.
-func UnmarshalMerge(buf []byte, pb Message) error {
-	if u, ok := pb.(newUnmarshaler); ok {
-		return u.XXX_Unmarshal(buf)
-	}
-	if u, ok := pb.(Unmarshaler); ok {
-		// NOTE: The history of proto have unfortunately been inconsistent
-		// whether Unmarshaler should or should not implicitly clear itself.
-		// Some implementations do, most do not.
-		// Thus, calling this here may or may not do what people want.
-		//
-		// See https://github.com/golang/protobuf/issues/424
-		return u.Unmarshal(buf)
-	}
-	return NewBuffer(buf).Unmarshal(pb)
-}
-
-// DecodeMessage reads a count-delimited message from the Buffer.
-func (p *Buffer) DecodeMessage(pb Message) error {
-	enc, err := p.DecodeRawBytes(false)
-	if err != nil {
-		return err
-	}
-	return NewBuffer(enc).Unmarshal(pb)
-}
-
-// DecodeGroup reads a tag-delimited group from the Buffer.
-// StartGroup tag is already consumed. This function consumes
-// EndGroup tag.
-func (p *Buffer) DecodeGroup(pb Message) error {
-	b := p.buf[p.index:]
-	x, y := findEndGroup(b)
-	if x < 0 {
-		return io.ErrUnexpectedEOF
-	}
-	err := Unmarshal(b[:x], pb)
-	p.index += y
-	return err
-}
-
-// Unmarshal parses the protocol buffer representation in the
-// Buffer and places the decoded result in pb.  If the struct
-// underlying pb does not match the data in the buffer, the results can be
-// unpredictable.
-//
-// Unlike proto.Unmarshal, this does not reset pb before starting to unmarshal.
-func (p *Buffer) Unmarshal(pb Message) error {
-	// If the object can unmarshal itself, let it.
-	if u, ok := pb.(newUnmarshaler); ok {
-		err := u.XXX_Unmarshal(p.buf[p.index:])
-		p.index = len(p.buf)
-		return err
-	}
-	if u, ok := pb.(Unmarshaler); ok {
-		// NOTE: The history of proto have unfortunately been inconsistent
-		// whether Unmarshaler should or should not implicitly clear itself.
-		// Some implementations do, most do not.
-		// Thus, calling this here may or may not do what people want.
-		//
-		// See https://github.com/golang/protobuf/issues/424
-		err := u.Unmarshal(p.buf[p.index:])
-		p.index = len(p.buf)
-		return err
-	}
-
-	// Slow workaround for messages that aren't Unmarshalers.
-	// This includes some hand-coded .pb.go files and
-	// bootstrap protos.
-	// TODO: fix all of those and then add Unmarshal to
-	// the Message interface. Then:
-	// The cast above and code below can be deleted.
-	// The old unmarshaler can be deleted.
-	// Clients can call Unmarshal directly (can already do that, actually).
-	var info InternalMessageInfo
-	err := info.Unmarshal(pb, p.buf[p.index:])
-	p.index = len(p.buf)
-	return err
-}

vendor/github.com/golang/protobuf/proto/discard.go

@@ -1,350 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2017 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package proto
-
-import (
-	"fmt"
-	"reflect"
-	"strings"
-	"sync"
-	"sync/atomic"
-)
-
-type generatedDiscarder interface {
-	XXX_DiscardUnknown()
-}
-
-// DiscardUnknown recursively discards all unknown fields from this message
-// and all embedded messages.
-//
-// When unmarshaling a message with unrecognized fields, the tags and values
-// of such fields are preserved in the Message. This allows a later call to
-// marshal to be able to produce a message that continues to have those
-// unrecognized fields. To avoid this, DiscardUnknown is used to
-// explicitly clear the unknown fields after unmarshaling.
-//
-// For proto2 messages, the unknown fields of message extensions are only
-// discarded from messages that have been accessed via GetExtension.
-func DiscardUnknown(m Message) {
-	if m, ok := m.(generatedDiscarder); ok {
-		m.XXX_DiscardUnknown()
-		return
-	}
-	// TODO: Dynamically populate a InternalMessageInfo for legacy messages,
-	// but the master branch has no implementation for InternalMessageInfo,
-	// so it would be more work to replicate that approach.
-	discardLegacy(m)
-}
-
-// DiscardUnknown recursively discards all unknown fields.
-func (a *InternalMessageInfo) DiscardUnknown(m Message) {
-	di := atomicLoadDiscardInfo(&a.discard)
-	if di == nil {
-		di = getDiscardInfo(reflect.TypeOf(m).Elem())
-		atomicStoreDiscardInfo(&a.discard, di)
-	}
-	di.discard(toPointer(&m))
-}
-
-type discardInfo struct {
-	typ reflect.Type
-
-	initialized int32 // 0: only typ is valid, 1: everything is valid
-	lock        sync.Mutex
-
-	fields       []discardFieldInfo
-	unrecognized field
-}
-
-type discardFieldInfo struct {
-	field   field // Offset of field, guaranteed to be valid
-	discard func(src pointer)
-}
-
-var (
-	discardInfoMap  = map[reflect.Type]*discardInfo{}
-	discardInfoLock sync.Mutex
-)
-
-func getDiscardInfo(t reflect.Type) *discardInfo {
-	discardInfoLock.Lock()
-	defer discardInfoLock.Unlock()
-	di := discardInfoMap[t]
-	if di == nil {
-		di = &discardInfo{typ: t}
-		discardInfoMap[t] = di
-	}
-	return di
-}
-
-func (di *discardInfo) discard(src pointer) {
-	if src.isNil() {
-		return // Nothing to do.
-	}
-
-	if atomic.LoadInt32(&di.initialized) == 0 {
-		di.computeDiscardInfo()
-	}
-
-	for _, fi := range di.fields {
-		sfp := src.offset(fi.field)
-		fi.discard(sfp)
-	}
-
-	// For proto2 messages, only discard unknown fields in message extensions
-	// that have been accessed via GetExtension.
-	if em, err := extendable(src.asPointerTo(di.typ).Interface()); err == nil {
-		// Ignore lock since DiscardUnknown is not concurrency safe.
-		emm, _ := em.extensionsRead()
-		for _, mx := range emm {
-			if m, ok := mx.value.(Message); ok {
-				DiscardUnknown(m)
-			}
-		}
-	}
-
-	if di.unrecognized.IsValid() {
-		*src.offset(di.unrecognized).toBytes() = nil
-	}
-}
-
-func (di *discardInfo) computeDiscardInfo() {
-	di.lock.Lock()
-	defer di.lock.Unlock()
-	if di.initialized != 0 {
-		return
-	}
-	t := di.typ
-	n := t.NumField()
-
-	for i := 0; i < n; i++ {
-		f := t.Field(i)
-		if strings.HasPrefix(f.Name, "XXX_") {
-			continue
-		}
-
-		dfi := discardFieldInfo{field: toField(&f)}
-		tf := f.Type
-
-		// Unwrap tf to get its most basic type.
-		var isPointer, isSlice bool
-		if tf.Kind() == reflect.Slice && tf.Elem().Kind() != reflect.Uint8 {
-			isSlice = true
-			tf = tf.Elem()
-		}
-		if tf.Kind() == reflect.Ptr {
-			isPointer = true
-			tf = tf.Elem()
-		}
-		if isPointer && isSlice && tf.Kind() != reflect.Struct {
-			panic(fmt.Sprintf("%v.%s cannot be a slice of pointers to primitive types", t, f.Name))
-		}
-
-		switch tf.Kind() {
-		case reflect.Struct:
-			switch {
-			case !isPointer:
-				panic(fmt.Sprintf("%v.%s cannot be a direct struct value", t, f.Name))
-			case isSlice: // E.g., []*pb.T
-				di := getDiscardInfo(tf)
-				dfi.discard = func(src pointer) {
-					sps := src.getPointerSlice()
-					for _, sp := range sps {
-						if !sp.isNil() {
-							di.discard(sp)
-						}
-					}
-				}
-			default: // E.g., *pb.T
-				di := getDiscardInfo(tf)
-				dfi.discard = func(src pointer) {
-					sp := src.getPointer()
-					if !sp.isNil() {
-						di.discard(sp)
-					}
-				}
-			}
-		case reflect.Map:
-			switch {
-			case isPointer || isSlice:
-				panic(fmt.Sprintf("%v.%s cannot be a pointer to a map or a slice of map values", t, f.Name))
-			default: // E.g., map[K]V
-				if tf.Elem().Kind() == reflect.Ptr { // Proto struct (e.g., *T)
-					dfi.discard = func(src pointer) {
-						sm := src.asPointerTo(tf).Elem()
-						if sm.Len() == 0 {
-							return
-						}
-						for _, key := range sm.MapKeys() {
-							val := sm.MapIndex(key)
-							DiscardUnknown(val.Interface().(Message))
-						}
-					}
-				} else {
-					dfi.discard = func(pointer) {} // Noop
-				}
-			}
-		case reflect.Interface:
-			// Must be oneof field.
-			switch {
-			case isPointer || isSlice:
-				panic(fmt.Sprintf("%v.%s cannot be a pointer to a interface or a slice of interface values", t, f.Name))
-			default: // E.g., interface{}
-				// TODO: Make this faster?
-				dfi.discard = func(src pointer) {
-					su := src.asPointerTo(tf).Elem()
-					if !su.IsNil() {
-						sv := su.Elem().Elem().Field(0)
-						if sv.Kind() == reflect.Ptr && sv.IsNil() {
-							return
-						}
-						switch sv.Type().Kind() {
-						case reflect.Ptr: // Proto struct (e.g., *T)
-							DiscardUnknown(sv.Interface().(Message))
-						}
-					}
-				}
-			}
-		default:
-			continue
-		}
-		di.fields = append(di.fields, dfi)
-	}
-
-	di.unrecognized = invalidField
-	if f, ok := t.FieldByName("XXX_unrecognized"); ok {
-		if f.Type != reflect.TypeOf([]byte{}) {
-			panic("expected XXX_unrecognized to be of type []byte")
-		}
-		di.unrecognized = toField(&f)
-	}
-
-	atomic.StoreInt32(&di.initialized, 1)
-}
-
-func discardLegacy(m Message) {
-	v := reflect.ValueOf(m)
-	if v.Kind() != reflect.Ptr || v.IsNil() {
-		return
-	}
-	v = v.Elem()
-	if v.Kind() != reflect.Struct {
-		return
-	}
-	t := v.Type()
-
-	for i := 0; i < v.NumField(); i++ {
-		f := t.Field(i)
-		if strings.HasPrefix(f.Name, "XXX_") {
-			continue
-		}
-		vf := v.Field(i)
-		tf := f.Type
-
-		// Unwrap tf to get its most basic type.
-		var isPointer, isSlice bool
-		if tf.Kind() == reflect.Slice && tf.Elem().Kind() != reflect.Uint8 {
-			isSlice = true
-			tf = tf.Elem()
-		}
-		if tf.Kind() == reflect.Ptr {
-			isPointer = true
-			tf = tf.Elem()
-		}
-		if isPointer && isSlice && tf.Kind() != reflect.Struct {
-			panic(fmt.Sprintf("%T.%s cannot be a slice of pointers to primitive types", m, f.Name))
-		}
-
-		switch tf.Kind() {
-		case reflect.Struct:
-			switch {
-			case !isPointer:
-				panic(fmt.Sprintf("%T.%s cannot be a direct struct value", m, f.Name))
-			case isSlice: // E.g., []*pb.T
-				for j := 0; j < vf.Len(); j++ {
-					discardLegacy(vf.Index(j).Interface().(Message))
-				}
-			default: // E.g., *pb.T
-				discardLegacy(vf.Interface().(Message))
-			}
-		case reflect.Map:
-			switch {
-			case isPointer || isSlice:
-				panic(fmt.Sprintf("%T.%s cannot be a pointer to a map or a slice of map values", m, f.Name))
-			default: // E.g., map[K]V
-				tv := vf.Type().Elem()
-				if tv.Kind() == reflect.Ptr && tv.Implements(protoMessageType) { // Proto struct (e.g., *T)
-					for _, key := range vf.MapKeys() {
-						val := vf.MapIndex(key)
-						discardLegacy(val.Interface().(Message))
-					}
-				}
-			}
-		case reflect.Interface:
-			// Must be oneof field.
-			switch {
-			case isPointer || isSlice:
-				panic(fmt.Sprintf("%T.%s cannot be a pointer to a interface or a slice of interface values", m, f.Name))
-			default: // E.g., test_proto.isCommunique_Union interface
-				if !vf.IsNil() && f.Tag.Get("protobuf_oneof") != "" {
-					vf = vf.Elem() // E.g., *test_proto.Communique_Msg
-					if !vf.IsNil() {
-						vf = vf.Elem()   // E.g., test_proto.Communique_Msg
-						vf = vf.Field(0) // E.g., Proto struct (e.g., *T) or primitive value
-						if vf.Kind() == reflect.Ptr {
-							discardLegacy(vf.Interface().(Message))
-						}
-					}
-				}
-			}
-		}
-	}
-
-	if vf := v.FieldByName("XXX_unrecognized"); vf.IsValid() {
-		if vf.Type() != reflect.TypeOf([]byte{}) {
-			panic("expected XXX_unrecognized to be of type []byte")
-		}
-		vf.Set(reflect.ValueOf([]byte(nil)))
-	}
-
-	// For proto2 messages, only discard unknown fields in message extensions
-	// that have been accessed via GetExtension.
-	if em, err := extendable(m); err == nil {
-		// Ignore lock since discardLegacy is not concurrency safe.
-		emm, _ := em.extensionsRead()
-		for _, mx := range emm {
-			if m, ok := mx.value.(Message); ok {
-				discardLegacy(m)
-			}
-		}
-	}
-}

vendor/github.com/golang/protobuf/proto/encode.go

@@ -1,203 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package proto
-
-/*
- * Routines for encoding data into the wire format for protocol buffers.
- */
-
-import (
-	"errors"
-	"reflect"
-)
-
-var (
-	// errRepeatedHasNil is the error returned if Marshal is called with
-	// a struct with a repeated field containing a nil element.
-	errRepeatedHasNil = errors.New("proto: repeated field has nil element")
-
-	// errOneofHasNil is the error returned if Marshal is called with
-	// a struct with a oneof field containing a nil element.
-	errOneofHasNil = errors.New("proto: oneof field has nil value")
-
-	// ErrNil is the error returned if Marshal is called with nil.
-	ErrNil = errors.New("proto: Marshal called with nil")
-
-	// ErrTooLarge is the error returned if Marshal is called with a
-	// message that encodes to >2GB.
-	ErrTooLarge = errors.New("proto: message encodes to over 2 GB")
-)
-
-// The fundamental encoders that put bytes on the wire.
-// Those that take integer types all accept uint64 and are
-// therefore of type valueEncoder.
-
-const maxVarintBytes = 10 // maximum length of a varint
-
-// EncodeVarint returns the varint encoding of x.
-// This is the format for the
-// int32, int64, uint32, uint64, bool, and enum
-// protocol buffer types.
-// Not used by the package itself, but helpful to clients
-// wishing to use the same encoding.
-func EncodeVarint(x uint64) []byte {
-	var buf [maxVarintBytes]byte
-	var n int
-	for n = 0; x > 127; n++ {
-		buf[n] = 0x80 | uint8(x&0x7F)
-		x >>= 7
-	}
-	buf[n] = uint8(x)
-	n++
-	return buf[0:n]
-}
-
-// EncodeVarint writes a varint-encoded integer to the Buffer.
-// This is the format for the
-// int32, int64, uint32, uint64, bool, and enum
-// protocol buffer types.
-func (p *Buffer) EncodeVarint(x uint64) error {
-	for x >= 1<<7 {
-		p.buf = append(p.buf, uint8(x&0x7f|0x80))
-		x >>= 7
-	}
-	p.buf = append(p.buf, uint8(x))
-	return nil
-}
-
-// SizeVarint returns the varint encoding size of an integer.
-func SizeVarint(x uint64) int {
-	switch {
-	case x < 1<<7:
-		return 1
-	case x < 1<<14:
-		return 2
-	case x < 1<<21:
-		return 3
-	case x < 1<<28:
-		return 4
-	case x < 1<<35:
-		return 5
-	case x < 1<<42:
-		return 6
-	case x < 1<<49:
-		return 7
-	case x < 1<<56:
-		return 8
-	case x < 1<<63:
-		return 9
-	}
-	return 10
-}
-
-// EncodeFixed64 writes a 64-bit integer to the Buffer.
-// This is the format for the
-// fixed64, sfixed64, and double protocol buffer types.
-func (p *Buffer) EncodeFixed64(x uint64) error {
-	p.buf = append(p.buf,
-		uint8(x),
-		uint8(x>>8),
-		uint8(x>>16),
-		uint8(x>>24),
-		uint8(x>>32),
-		uint8(x>>40),
-		uint8(x>>48),
-		uint8(x>>56))
-	return nil
-}
-
-// EncodeFixed32 writes a 32-bit integer to the Buffer.
-// This is the format for the
-// fixed32, sfixed32, and float protocol buffer types.
-func (p *Buffer) EncodeFixed32(x uint64) error {
-	p.buf = append(p.buf,
-		uint8(x),
-		uint8(x>>8),
-		uint8(x>>16),
-		uint8(x>>24))
-	return nil
-}
-
-// EncodeZigzag64 writes a zigzag-encoded 64-bit integer
-// to the Buffer.
-// This is the format used for the sint64 protocol buffer type.
-func (p *Buffer) EncodeZigzag64(x uint64) error {
-	// use signed number to get arithmetic right shift.
-	return p.EncodeVarint(uint64((x << 1) ^ uint64((int64(x) >> 63))))
-}
-
-// EncodeZigzag32 writes a zigzag-encoded 32-bit integer
-// to the Buffer.
-// This is the format used for the sint32 protocol buffer type.
-func (p *Buffer) EncodeZigzag32(x uint64) error {
-	// use signed number to get arithmetic right shift.
-	return p.EncodeVarint(uint64((uint32(x) << 1) ^ uint32((int32(x) >> 31))))
-}
-
-// EncodeRawBytes writes a count-delimited byte buffer to the Buffer.
-// This is the format used for the bytes protocol buffer
-// type and for embedded messages.
-func (p *Buffer) EncodeRawBytes(b []byte) error {
-	p.EncodeVarint(uint64(len(b)))
-	p.buf = append(p.buf, b...)
-	return nil
-}
-
-// EncodeStringBytes writes an encoded string to the Buffer.
-// This is the format used for the proto2 string type.
-func (p *Buffer) EncodeStringBytes(s string) error {
-	p.EncodeVarint(uint64(len(s)))
-	p.buf = append(p.buf, s...)
-	return nil
-}
-
-// Marshaler is the interface representing objects that can marshal themselves.
-type Marshaler interface {
-	Marshal() ([]byte, error)
-}
-
-// EncodeMessage writes the protocol buffer to the Buffer,
-// prefixed by a varint-encoded length.
-func (p *Buffer) EncodeMessage(pb Message) error {
-	siz := Size(pb)
-	p.EncodeVarint(uint64(siz))
-	return p.Marshal(pb)
-}
-
-// All protocol buffer fields are nillable, but be careful.
-func isNil(v reflect.Value) bool {
-	switch v.Kind() {
-	case reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
-		return v.IsNil()
-	}
-	return false
-}

vendor/github.com/golang/protobuf/proto/equal.go

@@ -1,300 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2011 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Protocol buffer comparison.
-
-package proto
-
-import (
-	"bytes"
-	"log"
-	"reflect"
-	"strings"
-)
-
-/*
-Equal returns true iff protocol buffers a and b are equal.
-The arguments must both be pointers to protocol buffer structs.
-
-Equality is defined in this way:
-  - Two messages are equal iff they are the same type,
-    corresponding fields are equal, unknown field sets
-    are equal, and extensions sets are equal.
-  - Two set scalar fields are equal iff their values are equal.
-    If the fields are of a floating-point type, remember that
-    NaN != x for all x, including NaN. If the message is defined
-    in a proto3 .proto file, fields are not "set"; specifically,
-    zero length proto3 "bytes" fields are equal (nil == {}).
-  - Two repeated fields are equal iff their lengths are the same,
-    and their corresponding elements are equal. Note a "bytes" field,
-    although represented by []byte, is not a repeated field and the
-    rule for the scalar fields described above applies.
-  - Two unset fields are equal.
-  - Two unknown field sets are equal if their current
-    encoded state is equal.
-  - Two extension sets are equal iff they have corresponding
-    elements that are pairwise equal.
-  - Two map fields are equal iff their lengths are the same,
-    and they contain the same set of elements. Zero-length map
-    fields are equal.
-  - Every other combination of things are not equal.
-
-The return value is undefined if a and b are not protocol buffers.
-*/
-func Equal(a, b Message) bool {
-	if a == nil || b == nil {
-		return a == b
-	}
-	v1, v2 := reflect.ValueOf(a), reflect.ValueOf(b)
-	if v1.Type() != v2.Type() {
-		return false
-	}
-	if v1.Kind() == reflect.Ptr {
-		if v1.IsNil() {
-			return v2.IsNil()
-		}
-		if v2.IsNil() {
-			return false
-		}
-		v1, v2 = v1.Elem(), v2.Elem()
-	}
-	if v1.Kind() != reflect.Struct {
-		return false
-	}
-	return equalStruct(v1, v2)
-}
-
-// v1 and v2 are known to have the same type.
-func equalStruct(v1, v2 reflect.Value) bool {
-	sprop := GetProperties(v1.Type())
-	for i := 0; i < v1.NumField(); i++ {
-		f := v1.Type().Field(i)
-		if strings.HasPrefix(f.Name, "XXX_") {
-			continue
-		}
-		f1, f2 := v1.Field(i), v2.Field(i)
-		if f.Type.Kind() == reflect.Ptr {
-			if n1, n2 := f1.IsNil(), f2.IsNil(); n1 && n2 {
-				// both unset
-				continue
-			} else if n1 != n2 {
-				// set/unset mismatch
-				return false
-			}
-			f1, f2 = f1.Elem(), f2.Elem()
-		}
-		if !equalAny(f1, f2, sprop.Prop[i]) {
-			return false
-		}
-	}
-
-	if em1 := v1.FieldByName("XXX_InternalExtensions"); em1.IsValid() {
-		em2 := v2.FieldByName("XXX_InternalExtensions")
-		if !equalExtensions(v1.Type(), em1.Interface().(XXX_InternalExtensions), em2.Interface().(XXX_InternalExtensions)) {
-			return false
-		}
-	}
-
-	if em1 := v1.FieldByName("XXX_extensions"); em1.IsValid() {
-		em2 := v2.FieldByName("XXX_extensions")
-		if !equalExtMap(v1.Type(), em1.Interface().(map[int32]Extension), em2.Interface().(map[int32]Extension)) {
-			return false
-		}
-	}
-
-	uf := v1.FieldByName("XXX_unrecognized")
-	if !uf.IsValid() {
-		return true
-	}
-
-	u1 := uf.Bytes()
-	u2 := v2.FieldByName("XXX_unrecognized").Bytes()
-	return bytes.Equal(u1, u2)
-}
-
-// v1 and v2 are known to have the same type.
-// prop may be nil.
-func equalAny(v1, v2 reflect.Value, prop *Properties) bool {
-	if v1.Type() == protoMessageType {
-		m1, _ := v1.Interface().(Message)
-		m2, _ := v2.Interface().(Message)
-		return Equal(m1, m2)
-	}
-	switch v1.Kind() {
-	case reflect.Bool:
-		return v1.Bool() == v2.Bool()
-	case reflect.Float32, reflect.Float64:
-		return v1.Float() == v2.Float()
-	case reflect.Int32, reflect.Int64:
-		return v1.Int() == v2.Int()
-	case reflect.Interface:
-		// Probably a oneof field; compare the inner values.
-		n1, n2 := v1.IsNil(), v2.IsNil()
-		if n1 || n2 {
-			return n1 == n2
-		}
-		e1, e2 := v1.Elem(), v2.Elem()
-		if e1.Type() != e2.Type() {
-			return false
-		}
-		return equalAny(e1, e2, nil)
-	case reflect.Map:
-		if v1.Len() != v2.Len() {
-			return false
-		}
-		for _, key := range v1.MapKeys() {
-			val2 := v2.MapIndex(key)
-			if !val2.IsValid() {
-				// This key was not found in the second map.
-				return false
-			}
-			if !equalAny(v1.MapIndex(key), val2, nil) {
-				return false
-			}
-		}
-		return true
-	case reflect.Ptr:
-		// Maps may have nil values in them, so check for nil.
-		if v1.IsNil() && v2.IsNil() {
-			return true
-		}
-		if v1.IsNil() != v2.IsNil() {
-			return false
-		}
-		return equalAny(v1.Elem(), v2.Elem(), prop)
-	case reflect.Slice:
-		if v1.Type().Elem().Kind() == reflect.Uint8 {
-			// short circuit: []byte
-
-			// Edge case: if this is in a proto3 message, a zero length
-			// bytes field is considered the zero value.
-			if prop != nil && prop.proto3 && v1.Len() == 0 && v2.Len() == 0 {
-				return true
-			}
-			if v1.IsNil() != v2.IsNil() {
-				return false
-			}
-			return bytes.Equal(v1.Interface().([]byte), v2.Interface().([]byte))
-		}
-
-		if v1.Len() != v2.Len() {
-			return false
-		}
-		for i := 0; i < v1.Len(); i++ {
-			if !equalAny(v1.Index(i), v2.Index(i), prop) {
-				return false
-			}
-		}
-		return true
-	case reflect.String:
-		return v1.Interface().(string) == v2.Interface().(string)
-	case reflect.Struct:
-		return equalStruct(v1, v2)
-	case reflect.Uint32, reflect.Uint64:
-		return v1.Uint() == v2.Uint()
-	}
-
-	// unknown type, so not a protocol buffer
-	log.Printf("proto: don't know how to compare %v", v1)
-	return false
-}
-
-// base is the struct type that the extensions are based on.
-// x1 and x2 are InternalExtensions.
-func equalExtensions(base reflect.Type, x1, x2 XXX_InternalExtensions) bool {
-	em1, _ := x1.extensionsRead()
-	em2, _ := x2.extensionsRead()
-	return equalExtMap(base, em1, em2)
-}
-
-func equalExtMap(base reflect.Type, em1, em2 map[int32]Extension) bool {
-	if len(em1) != len(em2) {
-		return false
-	}
-
-	for extNum, e1 := range em1 {
-		e2, ok := em2[extNum]
-		if !ok {
-			return false
-		}
-
-		m1, m2 := e1.value, e2.value
-
-		if m1 == nil && m2 == nil {
-			// Both have only encoded form.
-			if bytes.Equal(e1.enc, e2.enc) {
-				continue
-			}
-			// The bytes are different, but the extensions might still be
-			// equal. We need to decode them to compare.
-		}
-
-		if m1 != nil && m2 != nil {
-			// Both are unencoded.
-			if !equalAny(reflect.ValueOf(m1), reflect.ValueOf(m2), nil) {
-				return false
-			}
-			continue
-		}
-
-		// At least one is encoded. To do a semantically correct comparison
-		// we need to unmarshal them first.
-		var desc *ExtensionDesc
-		if m := extensionMaps[base]; m != nil {
-			desc = m[extNum]
-		}
-		if desc == nil {
-			// If both have only encoded form and the bytes are the same,
-			// it is handled above. We get here when the bytes are different.
-			// We don't know how to decode it, so just compare them as byte
-			// slices.
-			log.Printf("proto: don't know how to compare extension %d of %v", extNum, base)
-			return false
-		}
-		var err error
-		if m1 == nil {
-			m1, err = decodeExtension(e1.enc, desc)
-		}
-		if m2 == nil && err == nil {
-			m2, err = decodeExtension(e2.enc, desc)
-		}
-		if err != nil {
-			// The encoded form is invalid.
-			log.Printf("proto: badly encoded extension %d of %v: %v", extNum, base, err)
-			return false
-		}
-		if !equalAny(reflect.ValueOf(m1), reflect.ValueOf(m2), nil) {
-			return false
-		}
-	}
-
-	return true
-}

vendor/github.com/golang/protobuf/proto/extensions.go

@@ -1,543 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package proto
-
-/*
- * Types and routines for supporting protocol buffer extensions.
- */
-
-import (
-	"errors"
-	"fmt"
-	"io"
-	"reflect"
-	"strconv"
-	"sync"
-)
-
-// ErrMissingExtension is the error returned by GetExtension if the named extension is not in the message.
-var ErrMissingExtension = errors.New("proto: missing extension")
-
-// ExtensionRange represents a range of message extensions for a protocol buffer.
-// Used in code generated by the protocol compiler.
-type ExtensionRange struct {
-	Start, End int32 // both inclusive
-}
-
-// extendableProto is an interface implemented by any protocol buffer generated by the current
-// proto compiler that may be extended.
-type extendableProto interface {
-	Message
-	ExtensionRangeArray() []ExtensionRange
-	extensionsWrite() map[int32]Extension
-	extensionsRead() (map[int32]Extension, sync.Locker)
-}
-
-// extendableProtoV1 is an interface implemented by a protocol buffer generated by the previous
-// version of the proto compiler that may be extended.
-type extendableProtoV1 interface {
-	Message
-	ExtensionRangeArray() []ExtensionRange
-	ExtensionMap() map[int32]Extension
-}
-
-// extensionAdapter is a wrapper around extendableProtoV1 that implements extendableProto.
-type extensionAdapter struct {
-	extendableProtoV1
-}
-
-func (e extensionAdapter) extensionsWrite() map[int32]Extension {
-	return e.ExtensionMap()
-}
-
-func (e extensionAdapter) extensionsRead() (map[int32]Extension, sync.Locker) {
-	return e.ExtensionMap(), notLocker{}
-}
-
-// notLocker is a sync.Locker whose Lock and Unlock methods are nops.
-type notLocker struct{}
-
-func (n notLocker) Lock()   {}
-func (n notLocker) Unlock() {}
-
-// extendable returns the extendableProto interface for the given generated proto message.
-// If the proto message has the old extension format, it returns a wrapper that implements
-// the extendableProto interface.
-func extendable(p interface{}) (extendableProto, error) {
-	switch p := p.(type) {
-	case extendableProto:
-		if isNilPtr(p) {
-			return nil, fmt.Errorf("proto: nil %T is not extendable", p)
-		}
-		return p, nil
-	case extendableProtoV1:
-		if isNilPtr(p) {
-			return nil, fmt.Errorf("proto: nil %T is not extendable", p)
-		}
-		return extensionAdapter{p}, nil
-	}
-	// Don't allocate a specific error containing %T:
-	// this is the hot path for Clone and MarshalText.
-	return nil, errNotExtendable
-}
-
-var errNotExtendable = errors.New("proto: not an extendable proto.Message")
-
-func isNilPtr(x interface{}) bool {
-	v := reflect.ValueOf(x)
-	return v.Kind() == reflect.Ptr && v.IsNil()
-}
-
-// XXX_InternalExtensions is an internal representation of proto extensions.
-//
-// Each generated message struct type embeds an anonymous XXX_InternalExtensions field,
-// thus gaining the unexported 'extensions' method, which can be called only from the proto package.
-//
-// The methods of XXX_InternalExtensions are not concurrency safe in general,
-// but calls to logically read-only methods such as has and get may be executed concurrently.
-type XXX_InternalExtensions struct {
-	// The struct must be indirect so that if a user inadvertently copies a
-	// generated message and its embedded XXX_InternalExtensions, they
-	// avoid the mayhem of a copied mutex.
-	//
-	// The mutex serializes all logically read-only operations to p.extensionMap.
-	// It is up to the client to ensure that write operations to p.extensionMap are
-	// mutually exclusive with other accesses.
-	p *struct {
-		mu           sync.Mutex
-		extensionMap map[int32]Extension
-	}
-}
-
-// extensionsWrite returns the extension map, creating it on first use.
-func (e *XXX_InternalExtensions) extensionsWrite() map[int32]Extension {
-	if e.p == nil {
-		e.p = new(struct {
-			mu           sync.Mutex
-			extensionMap map[int32]Extension
-		})
-		e.p.extensionMap = make(map[int32]Extension)
-	}
-	return e.p.extensionMap
-}
-
-// extensionsRead returns the extensions map for read-only use.  It may be nil.
-// The caller must hold the returned mutex's lock when accessing Elements within the map.
-func (e *XXX_InternalExtensions) extensionsRead() (map[int32]Extension, sync.Locker) {
-	if e.p == nil {
-		return nil, nil
-	}
-	return e.p.extensionMap, &e.p.mu
-}
-
-// ExtensionDesc represents an extension specification.
-// Used in generated code from the protocol compiler.
-type ExtensionDesc struct {
-	ExtendedType  Message     // nil pointer to the type that is being extended
-	ExtensionType interface{} // nil pointer to the extension type
-	Field         int32       // field number
-	Name          string      // fully-qualified name of extension, for text formatting
-	Tag           string      // protobuf tag style
-	Filename      string      // name of the file in which the extension is defined
-}
-
-func (ed *ExtensionDesc) repeated() bool {
-	t := reflect.TypeOf(ed.ExtensionType)
-	return t.Kind() == reflect.Slice && t.Elem().Kind() != reflect.Uint8
-}
-
-// Extension represents an extension in a message.
-type Extension struct {
-	// When an extension is stored in a message using SetExtension
-	// only desc and value are set. When the message is marshaled
-	// enc will be set to the encoded form of the message.
-	//
-	// When a message is unmarshaled and contains extensions, each
-	// extension will have only enc set. When such an extension is
-	// accessed using GetExtension (or GetExtensions) desc and value
-	// will be set.
-	desc  *ExtensionDesc
-	value interface{}
-	enc   []byte
-}
-
-// SetRawExtension is for testing only.
-func SetRawExtension(base Message, id int32, b []byte) {
-	epb, err := extendable(base)
-	if err != nil {
-		return
-	}
-	extmap := epb.extensionsWrite()
-	extmap[id] = Extension{enc: b}
-}
-
-// isExtensionField returns true iff the given field number is in an extension range.
-func isExtensionField(pb extendableProto, field int32) bool {
-	for _, er := range pb.ExtensionRangeArray() {
-		if er.Start <= field && field <= er.End {
-			return true
-		}
-	}
-	return false
-}
-
-// checkExtensionTypes checks that the given extension is valid for pb.
-func checkExtensionTypes(pb extendableProto, extension *ExtensionDesc) error {
-	var pbi interface{} = pb
-	// Check the extended type.
-	if ea, ok := pbi.(extensionAdapter); ok {
-		pbi = ea.extendableProtoV1
-	}
-	if a, b := reflect.TypeOf(pbi), reflect.TypeOf(extension.ExtendedType); a != b {
-		return fmt.Errorf("proto: bad extended type; %v does not extend %v", b, a)
-	}
-	// Check the range.
-	if !isExtensionField(pb, extension.Field) {
-		return errors.New("proto: bad extension number; not in declared ranges")
-	}
-	return nil
-}
-
-// extPropKey is sufficient to uniquely identify an extension.
-type extPropKey struct {
-	base  reflect.Type
-	field int32
-}
-
-var extProp = struct {
-	sync.RWMutex
-	m map[extPropKey]*Properties
-}{
-	m: make(map[extPropKey]*Properties),
-}
-
-func extensionProperties(ed *ExtensionDesc) *Properties {
-	key := extPropKey{base: reflect.TypeOf(ed.ExtendedType), field: ed.Field}
-
-	extProp.RLock()
-	if prop, ok := extProp.m[key]; ok {
-		extProp.RUnlock()
-		return prop
-	}
-	extProp.RUnlock()
-
-	extProp.Lock()
-	defer extProp.Unlock()
-	// Check again.
-	if prop, ok := extProp.m[key]; ok {
-		return prop
-	}
-
-	prop := new(Properties)
-	prop.Init(reflect.TypeOf(ed.ExtensionType), "unknown_name", ed.Tag, nil)
-	extProp.m[key] = prop
-	return prop
-}
-
-// HasExtension returns whether the given extension is present in pb.
-func HasExtension(pb Message, extension *ExtensionDesc) bool {
-	// TODO: Check types, field numbers, etc.?
-	epb, err := extendable(pb)
-	if err != nil {
-		return false
-	}
-	extmap, mu := epb.extensionsRead()
-	if extmap == nil {
-		return false
-	}
-	mu.Lock()
-	_, ok := extmap[extension.Field]
-	mu.Unlock()
-	return ok
-}
-
-// ClearExtension removes the given extension from pb.
-func ClearExtension(pb Message, extension *ExtensionDesc) {
-	epb, err := extendable(pb)
-	if err != nil {
-		return
-	}
-	// TODO: Check types, field numbers, etc.?
-	extmap := epb.extensionsWrite()
-	delete(extmap, extension.Field)
-}
-
-// GetExtension retrieves a proto2 extended field from pb.
-//
-// If the descriptor is type complete (i.e., ExtensionDesc.ExtensionType is non-nil),
-// then GetExtension parses the encoded field and returns a Go value of the specified type.
-// If the field is not present, then the default value is returned (if one is specified),
-// otherwise ErrMissingExtension is reported.
-//
-// If the descriptor is not type complete (i.e., ExtensionDesc.ExtensionType is nil),
-// then GetExtension returns the raw encoded bytes of the field extension.
-func GetExtension(pb Message, extension *ExtensionDesc) (interface{}, error) {
-	epb, err := extendable(pb)
-	if err != nil {
-		return nil, err
-	}
-
-	if extension.ExtendedType != nil {
-		// can only check type if this is a complete descriptor
-		if err := checkExtensionTypes(epb, extension); err != nil {
-			return nil, err
-		}
-	}
-
-	emap, mu := epb.extensionsRead()
-	if emap == nil {
-		return defaultExtensionValue(extension)
-	}
-	mu.Lock()
-	defer mu.Unlock()
-	e, ok := emap[extension.Field]
-	if !ok {
-		// defaultExtensionValue returns the default value or
-		// ErrMissingExtension if there is no default.
-		return defaultExtensionValue(extension)
-	}
-
-	if e.value != nil {
-		// Already decoded. Check the descriptor, though.
-		if e.desc != extension {
-			// This shouldn't happen. If it does, it means that
-			// GetExtension was called twice with two different
-			// descriptors with the same field number.
-			return nil, errors.New("proto: descriptor conflict")
-		}
-		return e.value, nil
-	}
-
-	if extension.ExtensionType == nil {
-		// incomplete descriptor
-		return e.enc, nil
-	}
-
-	v, err := decodeExtension(e.enc, extension)
-	if err != nil {
-		return nil, err
-	}
-
-	// Remember the decoded version and drop the encoded version.
-	// That way it is safe to mutate what we return.
-	e.value = v
-	e.desc = extension
-	e.enc = nil
-	emap[extension.Field] = e
-	return e.value, nil
-}
-
-// defaultExtensionValue returns the default value for extension.
-// If no default for an extension is defined ErrMissingExtension is returned.
-func defaultExtensionValue(extension *ExtensionDesc) (interface{}, error) {
-	if extension.ExtensionType == nil {
-		// incomplete descriptor, so no default
-		return nil, ErrMissingExtension
-	}
-
-	t := reflect.TypeOf(extension.ExtensionType)
-	props := extensionProperties(extension)
-
-	sf, _, err := fieldDefault(t, props)
-	if err != nil {
-		return nil, err
-	}
-
-	if sf == nil || sf.value == nil {
-		// There is no default value.
-		return nil, ErrMissingExtension
-	}
-
-	if t.Kind() != reflect.Ptr {
-		// We do not need to return a Ptr, we can directly return sf.value.
-		return sf.value, nil
-	}
-
-	// We need to return an interface{} that is a pointer to sf.value.
-	value := reflect.New(t).Elem()
-	value.Set(reflect.New(value.Type().Elem()))
-	if sf.kind == reflect.Int32 {
-		// We may have an int32 or an enum, but the underlying data is int32.
-		// Since we can't set an int32 into a non int32 reflect.value directly
-		// set it as a int32.
-		value.Elem().SetInt(int64(sf.value.(int32)))
-	} else {
-		value.Elem().Set(reflect.ValueOf(sf.value))
-	}
-	return value.Interface(), nil
-}
-
-// decodeExtension decodes an extension encoded in b.
-func decodeExtension(b []byte, extension *ExtensionDesc) (interface{}, error) {
-	t := reflect.TypeOf(extension.ExtensionType)
-	unmarshal := typeUnmarshaler(t, extension.Tag)
-
-	// t is a pointer to a struct, pointer to basic type or a slice.
-	// Allocate space to store the pointer/slice.
-	value := reflect.New(t).Elem()
-
-	var err error
-	for {
-		x, n := decodeVarint(b)
-		if n == 0 {
-			return nil, io.ErrUnexpectedEOF
-		}
-		b = b[n:]
-		wire := int(x) & 7
-
-		b, err = unmarshal(b, valToPointer(value.Addr()), wire)
-		if err != nil {
-			return nil, err
-		}
-
-		if len(b) == 0 {
-			break
-		}
-	}
-	return value.Interface(), nil
-}
-
-// GetExtensions returns a slice of the extensions present in pb that are also listed in es.
-// The returned slice has the same length as es; missing extensions will appear as nil elements.
-func GetExtensions(pb Message, es []*ExtensionDesc) (extensions []interface{}, err error) {
-	epb, err := extendable(pb)
-	if err != nil {
-		return nil, err
-	}
-	extensions = make([]interface{}, len(es))
-	for i, e := range es {
-		extensions[i], err = GetExtension(epb, e)
-		if err == ErrMissingExtension {
-			err = nil
-		}
-		if err != nil {
-			return
-		}
-	}
-	return
-}
-
-// ExtensionDescs returns a new slice containing pb's extension descriptors, in undefined order.
-// For non-registered extensions, ExtensionDescs returns an incomplete descriptor containing
-// just the Field field, which defines the extension's field number.
-func ExtensionDescs(pb Message) ([]*ExtensionDesc, error) {
-	epb, err := extendable(pb)
-	if err != nil {
-		return nil, err
-	}
-	registeredExtensions := RegisteredExtensions(pb)
-
-	emap, mu := epb.extensionsRead()
-	if emap == nil {
-		return nil, nil
-	}
-	mu.Lock()
-	defer mu.Unlock()
-	extensions := make([]*ExtensionDesc, 0, len(emap))
-	for extid, e := range emap {
-		desc := e.desc
-		if desc == nil {
-			desc = registeredExtensions[extid]
-			if desc == nil {
-				desc = &ExtensionDesc{Field: extid}
-			}
-		}
-
-		extensions = append(extensions, desc)
-	}
-	return extensions, nil
-}
-
-// SetExtension sets the specified extension of pb to the specified value.
-func SetExtension(pb Message, extension *ExtensionDesc, value interface{}) error {
-	epb, err := extendable(pb)
-	if err != nil {
-		return err
-	}
-	if err := checkExtensionTypes(epb, extension); err != nil {
-		return err
-	}
-	typ := reflect.TypeOf(extension.ExtensionType)
-	if typ != reflect.TypeOf(value) {
-		return errors.New("proto: bad extension value type")
-	}
-	// nil extension values need to be caught early, because the
-	// encoder can't distinguish an ErrNil due to a nil extension
-	// from an ErrNil due to a missing field. Extensions are
-	// always optional, so the encoder would just swallow the error
-	// and drop all the extensions from the encoded message.
-	if reflect.ValueOf(value).IsNil() {
-		return fmt.Errorf("proto: SetExtension called with nil value of type %T", value)
-	}
-
-	extmap := epb.extensionsWrite()
-	extmap[extension.Field] = Extension{desc: extension, value: value}
-	return nil
-}
-
-// ClearAllExtensions clears all extensions from pb.
-func ClearAllExtensions(pb Message) {
-	epb, err := extendable(pb)
-	if err != nil {
-		return
-	}
-	m := epb.extensionsWrite()
-	for k := range m {
-		delete(m, k)
-	}
-}
-
-// A global registry of extensions.
-// The generated code will register the generated descriptors by calling RegisterExtension.
-
-var extensionMaps = make(map[reflect.Type]map[int32]*ExtensionDesc)
-
-// RegisterExtension is called from the generated code.
-func RegisterExtension(desc *ExtensionDesc) {
-	st := reflect.TypeOf(desc.ExtendedType).Elem()
-	m := extensionMaps[st]
-	if m == nil {
-		m = make(map[int32]*ExtensionDesc)
-		extensionMaps[st] = m
-	}
-	if _, ok := m[desc.Field]; ok {
-		panic("proto: duplicate extension registered: " + st.String() + " " + strconv.Itoa(int(desc.Field)))
-	}
-	m[desc.Field] = desc
-}
-
-// RegisteredExtensions returns a map of the registered extensions of a
-// protocol buffer struct, indexed by the extension number.
-// The argument pb should be a nil pointer to the struct type.
-func RegisteredExtensions(pb Message) map[int32]*ExtensionDesc {
-	return extensionMaps[reflect.TypeOf(pb).Elem()]
-}

vendor/github.com/golang/protobuf/proto/lib.go

@@ -1,979 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-/*
-Package proto converts data structures to and from the wire format of
-protocol buffers.  It works in concert with the Go source code generated
-for .proto files by the protocol compiler.
-
-A summary of the properties of the protocol buffer interface
-for a protocol buffer variable v:
-
-  - Names are turned from camel_case to CamelCase for export.
-  - There are no methods on v to set fields; just treat
-	them as structure fields.
-  - There are getters that return a field's value if set,
-	and return the field's default value if unset.
-	The getters work even if the receiver is a nil message.
-  - The zero value for a struct is its correct initialization state.
-	All desired fields must be set before marshaling.
-  - A Reset() method will restore a protobuf struct to its zero state.
-  - Non-repeated fields are pointers to the values; nil means unset.
-	That is, optional or required field int32 f becomes F *int32.
-  - Repeated fields are slices.
-  - Helper functions are available to aid the setting of fields.
-	msg.Foo = proto.String("hello") // set field
-  - Constants are defined to hold the default values of all fields that
-	have them.  They have the form Default_StructName_FieldName.
-	Because the getter methods handle defaulted values,
-	direct use of these constants should be rare.
-  - Enums are given type names and maps from names to values.
-	Enum values are prefixed by the enclosing message's name, or by the
-	enum's type name if it is a top-level enum. Enum types have a String
-	method, and a Enum method to assist in message construction.
-  - Nested messages, groups and enums have type names prefixed with the name of
-	the surrounding message type.
-  - Extensions are given descriptor names that start with E_,
-	followed by an underscore-delimited list of the nested messages
-	that contain it (if any) followed by the CamelCased name of the
-	extension field itself.  HasExtension, ClearExtension, GetExtension
-	and SetExtension are functions for manipulating extensions.
-  - Oneof field sets are given a single field in their message,
-	with distinguished wrapper types for each possible field value.
-  - Marshal and Unmarshal are functions to encode and decode the wire format.
-
-When the .proto file specifies `syntax="proto3"`, there are some differences:
-
-  - Non-repeated fields of non-message type are values instead of pointers.
-  - Enum types do not get an Enum method.
-
-The simplest way to describe this is to see an example.
-Given file test.proto, containing
-
-	package example;
-
-	enum FOO { X = 17; }
-
-	message Test {
-	  required string label = 1;
-	  optional int32 type = 2 [default=77];
-	  repeated int64 reps = 3;
-	  optional group OptionalGroup = 4 {
-	    required string RequiredField = 5;
-	  }
-	  oneof union {
-	    int32 number = 6;
-	    string name = 7;
-	  }
-	}
-
-The resulting file, test.pb.go, is:
-
-	package example
-
-	import proto "github.com/golang/protobuf/proto"
-	import math "math"
-
-	type FOO int32
-	const (
-		FOO_X FOO = 17
-	)
-	var FOO_name = map[int32]string{
-		17: "X",
-	}
-	var FOO_value = map[string]int32{
-		"X": 17,
-	}
-
-	func (x FOO) Enum() *FOO {
-		p := new(FOO)
-		*p = x
-		return p
-	}
-	func (x FOO) String() string {
-		return proto.EnumName(FOO_name, int32(x))
-	}
-	func (x *FOO) UnmarshalJSON(data []byte) error {
-		value, err := proto.UnmarshalJSONEnum(FOO_value, data)
-		if err != nil {
-			return err
-		}
-		*x = FOO(value)
-		return nil
-	}
-
-	type Test struct {
-		Label         *string             `protobuf:"bytes,1,req,name=label" json:"label,omitempty"`
-		Type          *int32              `protobuf:"varint,2,opt,name=type,def=77" json:"type,omitempty"`
-		Reps          []int64             `protobuf:"varint,3,rep,name=reps" json:"reps,omitempty"`
-		Optionalgroup *Test_OptionalGroup `protobuf:"group,4,opt,name=OptionalGroup" json:"optionalgroup,omitempty"`
-		// Types that are valid to be assigned to Union:
-		//	*Test_Number
-		//	*Test_Name
-		Union            isTest_Union `protobuf_oneof:"union"`
-		XXX_unrecognized []byte       `json:"-"`
-	}
-	func (m *Test) Reset()         { *m = Test{} }
-	func (m *Test) String() string { return proto.CompactTextString(m) }
-	func (*Test) ProtoMessage() {}
-
-	type isTest_Union interface {
-		isTest_Union()
-	}
-
-	type Test_Number struct {
-		Number int32 `protobuf:"varint,6,opt,name=number"`
-	}
-	type Test_Name struct {
-		Name string `protobuf:"bytes,7,opt,name=name"`
-	}
-
-	func (*Test_Number) isTest_Union() {}
-	func (*Test_Name) isTest_Union()   {}
-
-	func (m *Test) GetUnion() isTest_Union {
-		if m != nil {
-			return m.Union
-		}
-		return nil
-	}
-	const Default_Test_Type int32 = 77
-
-	func (m *Test) GetLabel() string {
-		if m != nil && m.Label != nil {
-			return *m.Label
-		}
-		return ""
-	}
-
-	func (m *Test) GetType() int32 {
-		if m != nil && m.Type != nil {
-			return *m.Type
-		}
-		return Default_Test_Type
-	}
-
-	func (m *Test) GetOptionalgroup() *Test_OptionalGroup {
-		if m != nil {
-			return m.Optionalgroup
-		}
-		return nil
-	}
-
-	type Test_OptionalGroup struct {
-		RequiredField *string `protobuf:"bytes,5,req" json:"RequiredField,omitempty"`
-	}
-	func (m *Test_OptionalGroup) Reset()         { *m = Test_OptionalGroup{} }
-	func (m *Test_OptionalGroup) String() string { return proto.CompactTextString(m) }
-
-	func (m *Test_OptionalGroup) GetRequiredField() string {
-		if m != nil && m.RequiredField != nil {
-			return *m.RequiredField
-		}
-		return ""
-	}
-
-	func (m *Test) GetNumber() int32 {
-		if x, ok := m.GetUnion().(*Test_Number); ok {
-			return x.Number
-		}
-		return 0
-	}
-
-	func (m *Test) GetName() string {
-		if x, ok := m.GetUnion().(*Test_Name); ok {
-			return x.Name
-		}
-		return ""
-	}
-
-	func init() {
-		proto.RegisterEnum("example.FOO", FOO_name, FOO_value)
-	}
-
-To create and play with a Test object:
-
-	package main
-
-	import (
-		"log"
-
-		"github.com/golang/protobuf/proto"
-		pb "./example.pb"
-	)
-
-	func main() {
-		test := &pb.Test{
-			Label: proto.String("hello"),
-			Type:  proto.Int32(17),
-			Reps:  []int64{1, 2, 3},
-			Optionalgroup: &pb.Test_OptionalGroup{
-				RequiredField: proto.String("good bye"),
-			},
-			Union: &pb.Test_Name{"fred"},
-		}
-		data, err := proto.Marshal(test)
-		if err != nil {
-			log.Fatal("marshaling error: ", err)
-		}
-		newTest := &pb.Test{}
-		err = proto.Unmarshal(data, newTest)
-		if err != nil {
-			log.Fatal("unmarshaling error: ", err)
-		}
-		// Now test and newTest contain the same data.
-		if test.GetLabel() != newTest.GetLabel() {
-			log.Fatalf("data mismatch %q != %q", test.GetLabel(), newTest.GetLabel())
-		}
-		// Use a type switch to determine which oneof was set.
-		switch u := test.Union.(type) {
-		case *pb.Test_Number: // u.Number contains the number.
-		case *pb.Test_Name: // u.Name contains the string.
-		}
-		// etc.
-	}
-*/
-package proto
-
-import (
-	"encoding/json"
-	"fmt"
-	"log"
-	"reflect"
-	"sort"
-	"strconv"
-	"sync"
-)
-
-// RequiredNotSetError is an error type returned by either Marshal or Unmarshal.
-// Marshal reports this when a required field is not initialized.
-// Unmarshal reports this when a required field is missing from the wire data.
-type RequiredNotSetError struct{ field string }
-
-func (e *RequiredNotSetError) Error() string {
-	if e.field == "" {
-		return fmt.Sprintf("proto: required field not set")
-	}
-	return fmt.Sprintf("proto: required field %q not set", e.field)
-}
-func (e *RequiredNotSetError) RequiredNotSet() bool {
-	return true
-}
-
-type invalidUTF8Error struct{ field string }
-
-func (e *invalidUTF8Error) Error() string {
-	if e.field == "" {
-		return "proto: invalid UTF-8 detected"
-	}
-	return fmt.Sprintf("proto: field %q contains invalid UTF-8", e.field)
-}
-func (e *invalidUTF8Error) InvalidUTF8() bool {
-	return true
-}
-
-// errInvalidUTF8 is a sentinel error to identify fields with invalid UTF-8.
-// This error should not be exposed to the external API as such errors should
-// be recreated with the field information.
-var errInvalidUTF8 = &invalidUTF8Error{}
-
-// isNonFatal reports whether the error is either a RequiredNotSet error
-// or a InvalidUTF8 error.
-func isNonFatal(err error) bool {
-	if re, ok := err.(interface{ RequiredNotSet() bool }); ok && re.RequiredNotSet() {
-		return true
-	}
-	if re, ok := err.(interface{ InvalidUTF8() bool }); ok && re.InvalidUTF8() {
-		return true
-	}
-	return false
-}
-
-type nonFatal struct{ E error }
-
-// Merge merges err into nf and reports whether it was successful.
-// Otherwise it returns false for any fatal non-nil errors.
-func (nf *nonFatal) Merge(err error) (ok bool) {
-	if err == nil {
-		return true // not an error
-	}
-	if !isNonFatal(err) {
-		return false // fatal error
-	}
-	if nf.E == nil {
-		nf.E = err // store first instance of non-fatal error
-	}
-	return true
-}
-
-// Message is implemented by generated protocol buffer messages.
-type Message interface {
-	Reset()
-	String() string
-	ProtoMessage()
-}
-
-// Stats records allocation details about the protocol buffer encoders
-// and decoders.  Useful for tuning the library itself.
-type Stats struct {
-	Emalloc uint64 // mallocs in encode
-	Dmalloc uint64 // mallocs in decode
-	Encode  uint64 // number of encodes
-	Decode  uint64 // number of decodes
-	Chit    uint64 // number of cache hits
-	Cmiss   uint64 // number of cache misses
-	Size    uint64 // number of sizes
-}
-
-// Set to true to enable stats collection.
-const collectStats = false
-
-var stats Stats
-
-// GetStats returns a copy of the global Stats structure.
-func GetStats() Stats { return stats }
-
-// A Buffer is a buffer manager for marshaling and unmarshaling
-// protocol buffers.  It may be reused between invocations to
-// reduce memory usage.  It is not necessary to use a Buffer;
-// the global functions Marshal and Unmarshal create a
-// temporary Buffer and are fine for most applications.
-type Buffer struct {
-	buf   []byte // encode/decode byte stream
-	index int    // read point
-
-	deterministic bool
-}
-
-// NewBuffer allocates a new Buffer and initializes its internal data to
-// the contents of the argument slice.
-func NewBuffer(e []byte) *Buffer {
-	return &Buffer{buf: e}
-}
-
-// Reset resets the Buffer, ready for marshaling a new protocol buffer.
-func (p *Buffer) Reset() {
-	p.buf = p.buf[0:0] // for reading/writing
-	p.index = 0        // for reading
-}
-
-// SetBuf replaces the internal buffer with the slice,
-// ready for unmarshaling the contents of the slice.
-func (p *Buffer) SetBuf(s []byte) {
-	p.buf = s
-	p.index = 0
-}
-
-// Bytes returns the contents of the Buffer.
-func (p *Buffer) Bytes() []byte { return p.buf }
-
-// SetDeterministic sets whether to use deterministic serialization.
-//
-// Deterministic serialization guarantees that for a given binary, equal
-// messages will always be serialized to the same bytes. This implies:
-//
-//   - Repeated serialization of a message will return the same bytes.
-//   - Different processes of the same binary (which may be executing on
-//     different machines) will serialize equal messages to the same bytes.
-//
-// Note that the deterministic serialization is NOT canonical across
-// languages. It is not guaranteed to remain stable over time. It is unstable
-// across different builds with schema changes due to unknown fields.
-// Users who need canonical serialization (e.g., persistent storage in a
-// canonical form, fingerprinting, etc.) should define their own
-// canonicalization specification and implement their own serializer rather
-// than relying on this API.
-//
-// If deterministic serialization is requested, map entries will be sorted
-// by keys in lexographical order. This is an implementation detail and
-// subject to change.
-func (p *Buffer) SetDeterministic(deterministic bool) {
-	p.deterministic = deterministic
-}
-
-/*
- * Helper routines for simplifying the creation of optional fields of basic type.
- */
-
-// Bool is a helper routine that allocates a new bool value
-// to store v and returns a pointer to it.
-func Bool(v bool) *bool {
-	return &v
-}
-
-// Int32 is a helper routine that allocates a new int32 value
-// to store v and returns a pointer to it.
-func Int32(v int32) *int32 {
-	return &v
-}
-
-// Int is a helper routine that allocates a new int32 value
-// to store v and returns a pointer to it, but unlike Int32
-// its argument value is an int.
-func Int(v int) *int32 {
-	p := new(int32)
-	*p = int32(v)
-	return p
-}
-
-// Int64 is a helper routine that allocates a new int64 value
-// to store v and returns a pointer to it.
-func Int64(v int64) *int64 {
-	return &v
-}
-
-// Float32 is a helper routine that allocates a new float32 value
-// to store v and returns a pointer to it.
-func Float32(v float32) *float32 {
-	return &v
-}
-
-// Float64 is a helper routine that allocates a new float64 value
-// to store v and returns a pointer to it.
-func Float64(v float64) *float64 {
-	return &v
-}
-
-// Uint32 is a helper routine that allocates a new uint32 value
-// to store v and returns a pointer to it.
-func Uint32(v uint32) *uint32 {
-	return &v
-}
-
-// Uint64 is a helper routine that allocates a new uint64 value
-// to store v and returns a pointer to it.
-func Uint64(v uint64) *uint64 {
-	return &v
-}
-
-// String is a helper routine that allocates a new string value
-// to store v and returns a pointer to it.
-func String(v string) *string {
-	return &v
-}
-
-// EnumName is a helper function to simplify printing protocol buffer enums
-// by name.  Given an enum map and a value, it returns a useful string.
-func EnumName(m map[int32]string, v int32) string {
-	s, ok := m[v]
-	if ok {
-		return s
-	}
-	return strconv.Itoa(int(v))
-}
-
-// UnmarshalJSONEnum is a helper function to simplify recovering enum int values
-// from their JSON-encoded representation. Given a map from the enum's symbolic
-// names to its int values, and a byte buffer containing the JSON-encoded
-// value, it returns an int32 that can be cast to the enum type by the caller.
-//
-// The function can deal with both JSON representations, numeric and symbolic.
-func UnmarshalJSONEnum(m map[string]int32, data []byte, enumName string) (int32, error) {
-	if data[0] == '"' {
-		// New style: enums are strings.
-		var repr string
-		if err := json.Unmarshal(data, &repr); err != nil {
-			return -1, err
-		}
-		val, ok := m[repr]
-		if !ok {
-			return 0, fmt.Errorf("unrecognized enum %s value %q", enumName, repr)
-		}
-		return val, nil
-	}
-	// Old style: enums are ints.
-	var val int32
-	if err := json.Unmarshal(data, &val); err != nil {
-		return 0, fmt.Errorf("cannot unmarshal %#q into enum %s", data, enumName)
-	}
-	return val, nil
-}
-
-// DebugPrint dumps the encoded data in b in a debugging format with a header
-// including the string s. Used in testing but made available for general debugging.
-func (p *Buffer) DebugPrint(s string, b []byte) {
-	var u uint64
-
-	obuf := p.buf
-	index := p.index
-	p.buf = b
-	p.index = 0
-	depth := 0
-
-	fmt.Printf("\n--- %s ---\n", s)
-
-out:
-	for {
-		for i := 0; i < depth; i++ {
-			fmt.Print("  ")
-		}
-
-		index := p.index
-		if index == len(p.buf) {
-			break
-		}
-
-		op, err := p.DecodeVarint()
-		if err != nil {
-			fmt.Printf("%3d: fetching op err %v\n", index, err)
-			break out
-		}
-		tag := op >> 3
-		wire := op & 7
-
-		switch wire {
-		default:
-			fmt.Printf("%3d: t=%3d unknown wire=%d\n",
-				index, tag, wire)
-			break out
-
-		case WireBytes:
-			var r []byte
-
-			r, err = p.DecodeRawBytes(false)
-			if err != nil {
-				break out
-			}
-			fmt.Printf("%3d: t=%3d bytes [%d]", index, tag, len(r))
-			if len(r) <= 6 {
-				for i := 0; i < len(r); i++ {
-					fmt.Printf(" %.2x", r[i])
-				}
-			} else {
-				for i := 0; i < 3; i++ {
-					fmt.Printf(" %.2x", r[i])
-				}
-				fmt.Printf(" ..")
-				for i := len(r) - 3; i < len(r); i++ {
-					fmt.Printf(" %.2x", r[i])
-				}
-			}
-			fmt.Printf("\n")
-
-		case WireFixed32:
-			u, err = p.DecodeFixed32()
-			if err != nil {
-				fmt.Printf("%3d: t=%3d fix32 err %v\n", index, tag, err)
-				break out
-			}
-			fmt.Printf("%3d: t=%3d fix32 %d\n", index, tag, u)
-
-		case WireFixed64:
-			u, err = p.DecodeFixed64()
-			if err != nil {
-				fmt.Printf("%3d: t=%3d fix64 err %v\n", index, tag, err)
-				break out
-			}
-			fmt.Printf("%3d: t=%3d fix64 %d\n", index, tag, u)
-
-		case WireVarint:
-			u, err = p.DecodeVarint()
-			if err != nil {
-				fmt.Printf("%3d: t=%3d varint err %v\n", index, tag, err)
-				break out
-			}
-			fmt.Printf("%3d: t=%3d varint %d\n", index, tag, u)
-
-		case WireStartGroup:
-			fmt.Printf("%3d: t=%3d start\n", index, tag)
-			depth++
-
-		case WireEndGroup:
-			depth--
-			fmt.Printf("%3d: t=%3d end\n", index, tag)
-		}
-	}
-
-	if depth != 0 {
-		fmt.Printf("%3d: start-end not balanced %d\n", p.index, depth)
-	}
-	fmt.Printf("\n")
-
-	p.buf = obuf
-	p.index = index
-}
-
-// SetDefaults sets unset protocol buffer fields to their default values.
-// It only modifies fields that are both unset and have defined defaults.
-// It recursively sets default values in any non-nil sub-messages.
-func SetDefaults(pb Message) {
-	setDefaults(reflect.ValueOf(pb), true, false)
-}
-
-// v is a pointer to a struct.
-func setDefaults(v reflect.Value, recur, zeros bool) {
-	v = v.Elem()
-
-	defaultMu.RLock()
-	dm, ok := defaults[v.Type()]
-	defaultMu.RUnlock()
-	if !ok {
-		dm = buildDefaultMessage(v.Type())
-		defaultMu.Lock()
-		defaults[v.Type()] = dm
-		defaultMu.Unlock()
-	}
-
-	for _, sf := range dm.scalars {
-		f := v.Field(sf.index)
-		if !f.IsNil() {
-			// field already set
-			continue
-		}
-		dv := sf.value
-		if dv == nil && !zeros {
-			// no explicit default, and don't want to set zeros
-			continue
-		}
-		fptr := f.Addr().Interface() // **T
-		// TODO: Consider batching the allocations we do here.
-		switch sf.kind {
-		case reflect.Bool:
-			b := new(bool)
-			if dv != nil {
-				*b = dv.(bool)
-			}
-			*(fptr.(**bool)) = b
-		case reflect.Float32:
-			f := new(float32)
-			if dv != nil {
-				*f = dv.(float32)
-			}
-			*(fptr.(**float32)) = f
-		case reflect.Float64:
-			f := new(float64)
-			if dv != nil {
-				*f = dv.(float64)
-			}
-			*(fptr.(**float64)) = f
-		case reflect.Int32:
-			// might be an enum
-			if ft := f.Type(); ft != int32PtrType {
-				// enum
-				f.Set(reflect.New(ft.Elem()))
-				if dv != nil {
-					f.Elem().SetInt(int64(dv.(int32)))
-				}
-			} else {
-				// int32 field
-				i := new(int32)
-				if dv != nil {
-					*i = dv.(int32)
-				}
-				*(fptr.(**int32)) = i
-			}
-		case reflect.Int64:
-			i := new(int64)
-			if dv != nil {
-				*i = dv.(int64)
-			}
-			*(fptr.(**int64)) = i
-		case reflect.String:
-			s := new(string)
-			if dv != nil {
-				*s = dv.(string)
-			}
-			*(fptr.(**string)) = s
-		case reflect.Uint8:
-			// exceptional case: []byte
-			var b []byte
-			if dv != nil {
-				db := dv.([]byte)
-				b = make([]byte, len(db))
-				copy(b, db)
-			} else {
-				b = []byte{}
-			}
-			*(fptr.(*[]byte)) = b
-		case reflect.Uint32:
-			u := new(uint32)
-			if dv != nil {
-				*u = dv.(uint32)
-			}
-			*(fptr.(**uint32)) = u
-		case reflect.Uint64:
-			u := new(uint64)
-			if dv != nil {
-				*u = dv.(uint64)
-			}
-			*(fptr.(**uint64)) = u
-		default:
-			log.Printf("proto: can't set default for field %v (sf.kind=%v)", f, sf.kind)
-		}
-	}
-
-	for _, ni := range dm.nested {
-		f := v.Field(ni)
-		// f is *T or []*T or map[T]*T
-		switch f.Kind() {
-		case reflect.Ptr:
-			if f.IsNil() {
-				continue
-			}
-			setDefaults(f, recur, zeros)
-
-		case reflect.Slice:
-			for i := 0; i < f.Len(); i++ {
-				e := f.Index(i)
-				if e.IsNil() {
-					continue
-				}
-				setDefaults(e, recur, zeros)
-			}
-
-		case reflect.Map:
-			for _, k := range f.MapKeys() {
-				e := f.MapIndex(k)
-				if e.IsNil() {
-					continue
-				}
-				setDefaults(e, recur, zeros)
-			}
-		}
-	}
-}
-
-var (
-	// defaults maps a protocol buffer struct type to a slice of the fields,
-	// with its scalar fields set to their proto-declared non-zero default values.
-	defaultMu sync.RWMutex
-	defaults  = make(map[reflect.Type]defaultMessage)
-
-	int32PtrType = reflect.TypeOf((*int32)(nil))
-)
-
-// defaultMessage represents information about the default values of a message.
-type defaultMessage struct {
-	scalars []scalarField
-	nested  []int // struct field index of nested messages
-}
-
-type scalarField struct {
-	index int          // struct field index
-	kind  reflect.Kind // element type (the T in *T or []T)
-	value interface{}  // the proto-declared default value, or nil
-}
-
-// t is a struct type.
-func buildDefaultMessage(t reflect.Type) (dm defaultMessage) {
-	sprop := GetProperties(t)
-	for _, prop := range sprop.Prop {
-		fi, ok := sprop.decoderTags.get(prop.Tag)
-		if !ok {
-			// XXX_unrecognized
-			continue
-		}
-		ft := t.Field(fi).Type
-
-		sf, nested, err := fieldDefault(ft, prop)
-		switch {
-		case err != nil:
-			log.Print(err)
-		case nested:
-			dm.nested = append(dm.nested, fi)
-		case sf != nil:
-			sf.index = fi
-			dm.scalars = append(dm.scalars, *sf)
-		}
-	}
-
-	return dm
-}
-
-// fieldDefault returns the scalarField for field type ft.
-// sf will be nil if the field can not have a default.
-// nestedMessage will be true if this is a nested message.
-// Note that sf.index is not set on return.
-func fieldDefault(ft reflect.Type, prop *Properties) (sf *scalarField, nestedMessage bool, err error) {
-	var canHaveDefault bool
-	switch ft.Kind() {
-	case reflect.Ptr:
-		if ft.Elem().Kind() == reflect.Struct {
-			nestedMessage = true
-		} else {
-			canHaveDefault = true // proto2 scalar field
-		}
-
-	case reflect.Slice:
-		switch ft.Elem().Kind() {
-		case reflect.Ptr:
-			nestedMessage = true // repeated message
-		case reflect.Uint8:
-			canHaveDefault = true // bytes field
-		}
-
-	case reflect.Map:
-		if ft.Elem().Kind() == reflect.Ptr {
-			nestedMessage = true // map with message values
-		}
-	}
-
-	if !canHaveDefault {
-		if nestedMessage {
-			return nil, true, nil
-		}
-		return nil, false, nil
-	}
-
-	// We now know that ft is a pointer or slice.
-	sf = &scalarField{kind: ft.Elem().Kind()}
-
-	// scalar fields without defaults
-	if !prop.HasDefault {
-		return sf, false, nil
-	}
-
-	// a scalar field: either *T or []byte
-	switch ft.Elem().Kind() {
-	case reflect.Bool:
-		x, err := strconv.ParseBool(prop.Default)
-		if err != nil {
-			return nil, false, fmt.Errorf("proto: bad default bool %q: %v", prop.Default, err)
-		}
-		sf.value = x
-	case reflect.Float32:
-		x, err := strconv.ParseFloat(prop.Default, 32)
-		if err != nil {
-			return nil, false, fmt.Errorf("proto: bad default float32 %q: %v", prop.Default, err)
-		}
-		sf.value = float32(x)
-	case reflect.Float64:
-		x, err := strconv.ParseFloat(prop.Default, 64)
-		if err != nil {
-			return nil, false, fmt.Errorf("proto: bad default float64 %q: %v", prop.Default, err)
-		}
-		sf.value = x
-	case reflect.Int32:
-		x, err := strconv.ParseInt(prop.Default, 10, 32)
-		if err != nil {
-			return nil, false, fmt.Errorf("proto: bad default int32 %q: %v", prop.Default, err)
-		}
-		sf.value = int32(x)
-	case reflect.Int64:
-		x, err := strconv.ParseInt(prop.Default, 10, 64)
-		if err != nil {
-			return nil, false, fmt.Errorf("proto: bad default int64 %q: %v", prop.Default, err)
-		}
-		sf.value = x
-	case reflect.String:
-		sf.value = prop.Default
-	case reflect.Uint8:
-		// []byte (not *uint8)
-		sf.value = []byte(prop.Default)
-	case reflect.Uint32:
-		x, err := strconv.ParseUint(prop.Default, 10, 32)
-		if err != nil {
-			return nil, false, fmt.Errorf("proto: bad default uint32 %q: %v", prop.Default, err)
-		}
-		sf.value = uint32(x)
-	case reflect.Uint64:
-		x, err := strconv.ParseUint(prop.Default, 10, 64)
-		if err != nil {
-			return nil, false, fmt.Errorf("proto: bad default uint64 %q: %v", prop.Default, err)
-		}
-		sf.value = x
-	default:
-		return nil, false, fmt.Errorf("proto: unhandled def kind %v", ft.Elem().Kind())
-	}
-
-	return sf, false, nil
-}
-
-// mapKeys returns a sort.Interface to be used for sorting the map keys.
-// Map fields may have key types of non-float scalars, strings and enums.
-func mapKeys(vs []reflect.Value) sort.Interface {
-	s := mapKeySorter{vs: vs}
-
-	// Type specialization per https://developers.google.com/protocol-buffers/docs/proto#maps.
-	if len(vs) == 0 {
-		return s
-	}
-	switch vs[0].Kind() {
-	case reflect.Int32, reflect.Int64:
-		s.less = func(a, b reflect.Value) bool { return a.Int() < b.Int() }
-	case reflect.Uint32, reflect.Uint64:
-		s.less = func(a, b reflect.Value) bool { return a.Uint() < b.Uint() }
-	case reflect.Bool:
-		s.less = func(a, b reflect.Value) bool { return !a.Bool() && b.Bool() } // false < true
-	case reflect.String:
-		s.less = func(a, b reflect.Value) bool { return a.String() < b.String() }
-	default:
-		panic(fmt.Sprintf("unsupported map key type: %v", vs[0].Kind()))
-	}
-
-	return s
-}
-
-type mapKeySorter struct {
-	vs   []reflect.Value
-	less func(a, b reflect.Value) bool
-}
-
-func (s mapKeySorter) Len() int      { return len(s.vs) }
-func (s mapKeySorter) Swap(i, j int) { s.vs[i], s.vs[j] = s.vs[j], s.vs[i] }
-func (s mapKeySorter) Less(i, j int) bool {
-	return s.less(s.vs[i], s.vs[j])
-}
-
-// isProto3Zero reports whether v is a zero proto3 value.
-func isProto3Zero(v reflect.Value) bool {
-	switch v.Kind() {
-	case reflect.Bool:
-		return !v.Bool()
-	case reflect.Int32, reflect.Int64:
-		return v.Int() == 0
-	case reflect.Uint32, reflect.Uint64:
-		return v.Uint() == 0
-	case reflect.Float32, reflect.Float64:
-		return v.Float() == 0
-	case reflect.String:
-		return v.String() == ""
-	}
-	return false
-}
-
-// ProtoPackageIsVersion2 is referenced from generated protocol buffer files
-// to assert that that code is compatible with this version of the proto package.
-const ProtoPackageIsVersion2 = true
-
-// ProtoPackageIsVersion1 is referenced from generated protocol buffer files
-// to assert that that code is compatible with this version of the proto package.
-const ProtoPackageIsVersion1 = true
-
-// InternalMessageInfo is a type used internally by generated .pb.go files.
-// This type is not intended to be used by non-generated code.
-// This type is not subject to any compatibility guarantee.
-type InternalMessageInfo struct {
-	marshal   *marshalInfo
-	unmarshal *unmarshalInfo
-	merge     *mergeInfo
-	discard   *discardInfo
-}

vendor/github.com/golang/protobuf/proto/message_set.go

@@ -1,314 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package proto
-
-/*
- * Support for message sets.
- */
-
-import (
-	"bytes"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"reflect"
-	"sort"
-	"sync"
-)
-
-// errNoMessageTypeID occurs when a protocol buffer does not have a message type ID.
-// A message type ID is required for storing a protocol buffer in a message set.
-var errNoMessageTypeID = errors.New("proto does not have a message type ID")
-
-// The first two types (_MessageSet_Item and messageSet)
-// model what the protocol compiler produces for the following protocol message:
-//   message MessageSet {
-//     repeated group Item = 1 {
-//       required int32 type_id = 2;
-//       required string message = 3;
-//     };
-//   }
-// That is the MessageSet wire format. We can't use a proto to generate these
-// because that would introduce a circular dependency between it and this package.
-
-type _MessageSet_Item struct {
-	TypeId  *int32 `protobuf:"varint,2,req,name=type_id"`
-	Message []byte `protobuf:"bytes,3,req,name=message"`
-}
-
-type messageSet struct {
-	Item             []*_MessageSet_Item `protobuf:"group,1,rep"`
-	XXX_unrecognized []byte
-	// TODO: caching?
-}
-
-// Make sure messageSet is a Message.
-var _ Message = (*messageSet)(nil)
-
-// messageTypeIder is an interface satisfied by a protocol buffer type
-// that may be stored in a MessageSet.
-type messageTypeIder interface {
-	MessageTypeId() int32
-}
-
-func (ms *messageSet) find(pb Message) *_MessageSet_Item {
-	mti, ok := pb.(messageTypeIder)
-	if !ok {
-		return nil
-	}
-	id := mti.MessageTypeId()
-	for _, item := range ms.Item {
-		if *item.TypeId == id {
-			return item
-		}
-	}
-	return nil
-}
-
-func (ms *messageSet) Has(pb Message) bool {
-	return ms.find(pb) != nil
-}
-
-func (ms *messageSet) Unmarshal(pb Message) error {
-	if item := ms.find(pb); item != nil {
-		return Unmarshal(item.Message, pb)
-	}
-	if _, ok := pb.(messageTypeIder); !ok {
-		return errNoMessageTypeID
-	}
-	return nil // TODO: return error instead?
-}
-
-func (ms *messageSet) Marshal(pb Message) error {
-	msg, err := Marshal(pb)
-	if err != nil {
-		return err
-	}
-	if item := ms.find(pb); item != nil {
-		// reuse existing item
-		item.Message = msg
-		return nil
-	}
-
-	mti, ok := pb.(messageTypeIder)
-	if !ok {
-		return errNoMessageTypeID
-	}
-
-	mtid := mti.MessageTypeId()
-	ms.Item = append(ms.Item, &_MessageSet_Item{
-		TypeId:  &mtid,
-		Message: msg,
-	})
-	return nil
-}
-
-func (ms *messageSet) Reset()         { *ms = messageSet{} }
-func (ms *messageSet) String() string { return CompactTextString(ms) }
-func (*messageSet) ProtoMessage()     {}
-
-// Support for the message_set_wire_format message option.
-
-func skipVarint(buf []byte) []byte {
-	i := 0
-	for ; buf[i]&0x80 != 0; i++ {
-	}
-	return buf[i+1:]
-}
-
-// MarshalMessageSet encodes the extension map represented by m in the message set wire format.
-// It is called by generated Marshal methods on protocol buffer messages with the message_set_wire_format option.
-func MarshalMessageSet(exts interface{}) ([]byte, error) {
-	return marshalMessageSet(exts, false)
-}
-
-// marshaMessageSet implements above function, with the opt to turn on / off deterministic during Marshal.
-func marshalMessageSet(exts interface{}, deterministic bool) ([]byte, error) {
-	switch exts := exts.(type) {
-	case *XXX_InternalExtensions:
-		var u marshalInfo
-		siz := u.sizeMessageSet(exts)
-		b := make([]byte, 0, siz)
-		return u.appendMessageSet(b, exts, deterministic)
-
-	case map[int32]Extension:
-		// This is an old-style extension map.
-		// Wrap it in a new-style XXX_InternalExtensions.
-		ie := XXX_InternalExtensions{
-			p: &struct {
-				mu           sync.Mutex
-				extensionMap map[int32]Extension
-			}{
-				extensionMap: exts,
-			},
-		}
-
-		var u marshalInfo
-		siz := u.sizeMessageSet(&ie)
-		b := make([]byte, 0, siz)
-		return u.appendMessageSet(b, &ie, deterministic)
-
-	default:
-		return nil, errors.New("proto: not an extension map")
-	}
-}
-
-// UnmarshalMessageSet decodes the extension map encoded in buf in the message set wire format.
-// It is called by Unmarshal methods on protocol buffer messages with the message_set_wire_format option.
-func UnmarshalMessageSet(buf []byte, exts interface{}) error {
-	var m map[int32]Extension
-	switch exts := exts.(type) {
-	case *XXX_InternalExtensions:
-		m = exts.extensionsWrite()
-	case map[int32]Extension:
-		m = exts
-	default:
-		return errors.New("proto: not an extension map")
-	}
-
-	ms := new(messageSet)
-	if err := Unmarshal(buf, ms); err != nil {
-		return err
-	}
-	for _, item := range ms.Item {
-		id := *item.TypeId
-		msg := item.Message
-
-		// Restore wire type and field number varint, plus length varint.
-		// Be careful to preserve duplicate items.
-		b := EncodeVarint(uint64(id)<<3 | WireBytes)
-		if ext, ok := m[id]; ok {
-			// Existing data; rip off the tag and length varint
-			// so we join the new data correctly.
-			// We can assume that ext.enc is set because we are unmarshaling.
-			o := ext.enc[len(b):]   // skip wire type and field number
-			_, n := DecodeVarint(o) // calculate length of length varint
-			o = o[n:]               // skip length varint
-			msg = append(o, msg...) // join old data and new data
-		}
-		b = append(b, EncodeVarint(uint64(len(msg)))...)
-		b = append(b, msg...)
-
-		m[id] = Extension{enc: b}
-	}
-	return nil
-}
-
-// MarshalMessageSetJSON encodes the extension map represented by m in JSON format.
-// It is called by generated MarshalJSON methods on protocol buffer messages with the message_set_wire_format option.
-func MarshalMessageSetJSON(exts interface{}) ([]byte, error) {
-	var m map[int32]Extension
-	switch exts := exts.(type) {
-	case *XXX_InternalExtensions:
-		var mu sync.Locker
-		m, mu = exts.extensionsRead()
-		if m != nil {
-			// Keep the extensions map locked until we're done marshaling to prevent
-			// races between marshaling and unmarshaling the lazily-{en,de}coded
-			// values.
-			mu.Lock()
-			defer mu.Unlock()
-		}
-	case map[int32]Extension:
-		m = exts
-	default:
-		return nil, errors.New("proto: not an extension map")
-	}
-	var b bytes.Buffer
-	b.WriteByte('{')
-
-	// Process the map in key order for deterministic output.
-	ids := make([]int32, 0, len(m))
-	for id := range m {
-		ids = append(ids, id)
-	}
-	sort.Sort(int32Slice(ids)) // int32Slice defined in text.go
-
-	for i, id := range ids {
-		ext := m[id]
-		msd, ok := messageSetMap[id]
-		if !ok {
-			// Unknown type; we can't render it, so skip it.
-			continue
-		}
-
-		if i > 0 && b.Len() > 1 {
-			b.WriteByte(',')
-		}
-
-		fmt.Fprintf(&b, `"[%s]":`, msd.name)
-
-		x := ext.value
-		if x == nil {
-			x = reflect.New(msd.t.Elem()).Interface()
-			if err := Unmarshal(ext.enc, x.(Message)); err != nil {
-				return nil, err
-			}
-		}
-		d, err := json.Marshal(x)
-		if err != nil {
-			return nil, err
-		}
-		b.Write(d)
-	}
-	b.WriteByte('}')
-	return b.Bytes(), nil
-}
-
-// UnmarshalMessageSetJSON decodes the extension map encoded in buf in JSON format.
-// It is called by generated UnmarshalJSON methods on protocol buffer messages with the message_set_wire_format option.
-func UnmarshalMessageSetJSON(buf []byte, exts interface{}) error {
-	// Common-case fast path.
-	if len(buf) == 0 || bytes.Equal(buf, []byte("{}")) {
-		return nil
-	}
-
-	// This is fairly tricky, and it's not clear that it is needed.
-	return errors.New("TODO: UnmarshalMessageSetJSON not yet implemented")
-}
-
-// A global registry of types that can be used in a MessageSet.
-
-var messageSetMap = make(map[int32]messageSetDesc)
-
-type messageSetDesc struct {
-	t    reflect.Type // pointer to struct
-	name string
-}
-
-// RegisterMessageSetType is called from the generated code.
-func RegisterMessageSetType(m Message, fieldNum int32, name string) {
-	messageSetMap[fieldNum] = messageSetDesc{
-		t:    reflect.TypeOf(m),
-		name: name,
-	}
-}

vendor/github.com/golang/protobuf/proto/pointer_reflect.go

@@ -1,357 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2012 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// +build purego appengine js
-
-// This file contains an implementation of proto field accesses using package reflect.
-// It is slower than the code in pointer_unsafe.go but it avoids package unsafe and can
-// be used on App Engine.
-
-package proto
-
-import (
-	"reflect"
-	"sync"
-)
-
-const unsafeAllowed = false
-
-// A field identifies a field in a struct, accessible from a pointer.
-// In this implementation, a field is identified by the sequence of field indices
-// passed to reflect's FieldByIndex.
-type field []int
-
-// toField returns a field equivalent to the given reflect field.
-func toField(f *reflect.StructField) field {
-	return f.Index
-}
-
-// invalidField is an invalid field identifier.
-var invalidField = field(nil)
-
-// zeroField is a noop when calling pointer.offset.
-var zeroField = field([]int{})
-
-// IsValid reports whether the field identifier is valid.
-func (f field) IsValid() bool { return f != nil }
-
-// The pointer type is for the table-driven decoder.
-// The implementation here uses a reflect.Value of pointer type to
-// create a generic pointer. In pointer_unsafe.go we use unsafe
-// instead of reflect to implement the same (but faster) interface.
-type pointer struct {
-	v reflect.Value
-}
-
-// toPointer converts an interface of pointer type to a pointer
-// that points to the same target.
-func toPointer(i *Message) pointer {
-	return pointer{v: reflect.ValueOf(*i)}
-}
-
-// toAddrPointer converts an interface to a pointer that points to
-// the interface data.
-func toAddrPointer(i *interface{}, isptr bool) pointer {
-	v := reflect.ValueOf(*i)
-	u := reflect.New(v.Type())
-	u.Elem().Set(v)
-	return pointer{v: u}
-}
-
-// valToPointer converts v to a pointer.  v must be of pointer type.
-func valToPointer(v reflect.Value) pointer {
-	return pointer{v: v}
-}
-
-// offset converts from a pointer to a structure to a pointer to
-// one of its fields.
-func (p pointer) offset(f field) pointer {
-	return pointer{v: p.v.Elem().FieldByIndex(f).Addr()}
-}
-
-func (p pointer) isNil() bool {
-	return p.v.IsNil()
-}
-
-// grow updates the slice s in place to make it one element longer.
-// s must be addressable.
-// Returns the (addressable) new element.
-func grow(s reflect.Value) reflect.Value {
-	n, m := s.Len(), s.Cap()
-	if n < m {
-		s.SetLen(n + 1)
-	} else {
-		s.Set(reflect.Append(s, reflect.Zero(s.Type().Elem())))
-	}
-	return s.Index(n)
-}
-
-func (p pointer) toInt64() *int64 {
-	return p.v.Interface().(*int64)
-}
-func (p pointer) toInt64Ptr() **int64 {
-	return p.v.Interface().(**int64)
-}
-func (p pointer) toInt64Slice() *[]int64 {
-	return p.v.Interface().(*[]int64)
-}
-
-var int32ptr = reflect.TypeOf((*int32)(nil))
-
-func (p pointer) toInt32() *int32 {
-	return p.v.Convert(int32ptr).Interface().(*int32)
-}
-
-// The toInt32Ptr/Slice methods don't work because of enums.
-// Instead, we must use set/get methods for the int32ptr/slice case.
-/*
-	func (p pointer) toInt32Ptr() **int32 {
-		return p.v.Interface().(**int32)
-}
-	func (p pointer) toInt32Slice() *[]int32 {
-		return p.v.Interface().(*[]int32)
-}
-*/
-func (p pointer) getInt32Ptr() *int32 {
-	if p.v.Type().Elem().Elem() == reflect.TypeOf(int32(0)) {
-		// raw int32 type
-		return p.v.Elem().Interface().(*int32)
-	}
-	// an enum
-	return p.v.Elem().Convert(int32PtrType).Interface().(*int32)
-}
-func (p pointer) setInt32Ptr(v int32) {
-	// Allocate value in a *int32. Possibly convert that to a *enum.
-	// Then assign it to a **int32 or **enum.
-	// Note: we can convert *int32 to *enum, but we can't convert
-	// **int32 to **enum!
-	p.v.Elem().Set(reflect.ValueOf(&v).Convert(p.v.Type().Elem()))
-}
-
-// getInt32Slice copies []int32 from p as a new slice.
-// This behavior differs from the implementation in pointer_unsafe.go.
-func (p pointer) getInt32Slice() []int32 {
-	if p.v.Type().Elem().Elem() == reflect.TypeOf(int32(0)) {
-		// raw int32 type
-		return p.v.Elem().Interface().([]int32)
-	}
-	// an enum
-	// Allocate a []int32, then assign []enum's values into it.
-	// Note: we can't convert []enum to []int32.
-	slice := p.v.Elem()
-	s := make([]int32, slice.Len())
-	for i := 0; i < slice.Len(); i++ {
-		s[i] = int32(slice.Index(i).Int())
-	}
-	return s
-}
-
-// setInt32Slice copies []int32 into p as a new slice.
-// This behavior differs from the implementation in pointer_unsafe.go.
-func (p pointer) setInt32Slice(v []int32) {
-	if p.v.Type().Elem().Elem() == reflect.TypeOf(int32(0)) {
-		// raw int32 type
-		p.v.Elem().Set(reflect.ValueOf(v))
-		return
-	}
-	// an enum
-	// Allocate a []enum, then assign []int32's values into it.
-	// Note: we can't convert []enum to []int32.
-	slice := reflect.MakeSlice(p.v.Type().Elem(), len(v), cap(v))
-	for i, x := range v {
-		slice.Index(i).SetInt(int64(x))
-	}
-	p.v.Elem().Set(slice)
-}
-func (p pointer) appendInt32Slice(v int32) {
-	grow(p.v.Elem()).SetInt(int64(v))
-}
-
-func (p pointer) toUint64() *uint64 {
-	return p.v.Interface().(*uint64)
-}
-func (p pointer) toUint64Ptr() **uint64 {
-	return p.v.Interface().(**uint64)
-}
-func (p pointer) toUint64Slice() *[]uint64 {
-	return p.v.Interface().(*[]uint64)
-}
-func (p pointer) toUint32() *uint32 {
-	return p.v.Interface().(*uint32)
-}
-func (p pointer) toUint32Ptr() **uint32 {
-	return p.v.Interface().(**uint32)
-}
-func (p pointer) toUint32Slice() *[]uint32 {
-	return p.v.Interface().(*[]uint32)
-}
-func (p pointer) toBool() *bool {
-	return p.v.Interface().(*bool)
-}
-func (p pointer) toBoolPtr() **bool {
-	return p.v.Interface().(**bool)
-}
-func (p pointer) toBoolSlice() *[]bool {
-	return p.v.Interface().(*[]bool)
-}
-func (p pointer) toFloat64() *float64 {
-	return p.v.Interface().(*float64)
-}
-func (p pointer) toFloat64Ptr() **float64 {
-	return p.v.Interface().(**float64)
-}
-func (p pointer) toFloat64Slice() *[]float64 {
-	return p.v.Interface().(*[]float64)
-}
-func (p pointer) toFloat32() *float32 {
-	return p.v.Interface().(*float32)
-}
-func (p pointer) toFloat32Ptr() **float32 {
-	return p.v.Interface().(**float32)
-}
-func (p pointer) toFloat32Slice() *[]float32 {
-	return p.v.Interface().(*[]float32)
-}
-func (p pointer) toString() *string {
-	return p.v.Interface().(*string)
-}
-func (p pointer) toStringPtr() **string {
-	return p.v.Interface().(**string)
-}
-func (p pointer) toStringSlice() *[]string {
-	return p.v.Interface().(*[]string)
-}
-func (p pointer) toBytes() *[]byte {
-	return p.v.Interface().(*[]byte)
-}
-func (p pointer) toBytesSlice() *[][]byte {
-	return p.v.Interface().(*[][]byte)
-}
-func (p pointer) toExtensions() *XXX_InternalExtensions {
-	return p.v.Interface().(*XXX_InternalExtensions)
-}
-func (p pointer) toOldExtensions() *map[int32]Extension {
-	return p.v.Interface().(*map[int32]Extension)
-}
-func (p pointer) getPointer() pointer {
-	return pointer{v: p.v.Elem()}
-}
-func (p pointer) setPointer(q pointer) {
-	p.v.Elem().Set(q.v)
-}
-func (p pointer) appendPointer(q pointer) {
-	grow(p.v.Elem()).Set(q.v)
-}
-
-// getPointerSlice copies []*T from p as a new []pointer.
-// This behavior differs from the implementation in pointer_unsafe.go.
-func (p pointer) getPointerSlice() []pointer {
-	if p.v.IsNil() {
-		return nil
-	}
-	n := p.v.Elem().Len()
-	s := make([]pointer, n)
-	for i := 0; i < n; i++ {
-		s[i] = pointer{v: p.v.Elem().Index(i)}
-	}
-	return s
-}
-
-// setPointerSlice copies []pointer into p as a new []*T.
-// This behavior differs from the implementation in pointer_unsafe.go.
-func (p pointer) setPointerSlice(v []pointer) {
-	if v == nil {
-		p.v.Elem().Set(reflect.New(p.v.Elem().Type()).Elem())
-		return
-	}
-	s := reflect.MakeSlice(p.v.Elem().Type(), 0, len(v))
-	for _, p := range v {
-		s = reflect.Append(s, p.v)
-	}
-	p.v.Elem().Set(s)
-}
-
-// getInterfacePointer returns a pointer that points to the
-// interface data of the interface pointed by p.
-func (p pointer) getInterfacePointer() pointer {
-	if p.v.Elem().IsNil() {
-		return pointer{v: p.v.Elem()}
-	}
-	return pointer{v: p.v.Elem().Elem().Elem().Field(0).Addr()} // *interface -> interface -> *struct -> struct
-}
-
-func (p pointer) asPointerTo(t reflect.Type) reflect.Value {
-	// TODO: check that p.v.Type().Elem() == t?
-	return p.v
-}
-
-func atomicLoadUnmarshalInfo(p **unmarshalInfo) *unmarshalInfo {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	return *p
-}
-func atomicStoreUnmarshalInfo(p **unmarshalInfo, v *unmarshalInfo) {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	*p = v
-}
-func atomicLoadMarshalInfo(p **marshalInfo) *marshalInfo {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	return *p
-}
-func atomicStoreMarshalInfo(p **marshalInfo, v *marshalInfo) {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	*p = v
-}
-func atomicLoadMergeInfo(p **mergeInfo) *mergeInfo {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	return *p
-}
-func atomicStoreMergeInfo(p **mergeInfo, v *mergeInfo) {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	*p = v
-}
-func atomicLoadDiscardInfo(p **discardInfo) *discardInfo {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	return *p
-}
-func atomicStoreDiscardInfo(p **discardInfo, v *discardInfo) {
-	atomicLock.Lock()
-	defer atomicLock.Unlock()
-	*p = v
-}
-
-var atomicLock sync.Mutex

vendor/github.com/golang/protobuf/proto/pointer_unsafe.go

@@ -1,308 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2012 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// +build !purego,!appengine,!js
-
-// This file contains the implementation of the proto field accesses using package unsafe.
-
-package proto
-
-import (
-	"reflect"
-	"sync/atomic"
-	"unsafe"
-)
-
-const unsafeAllowed = true
-
-// A field identifies a field in a struct, accessible from a pointer.
-// In this implementation, a field is identified by its byte offset from the start of the struct.
-type field uintptr
-
-// toField returns a field equivalent to the given reflect field.
-func toField(f *reflect.StructField) field {
-	return field(f.Offset)
-}
-
-// invalidField is an invalid field identifier.
-const invalidField = ^field(0)
-
-// zeroField is a noop when calling pointer.offset.
-const zeroField = field(0)
-
-// IsValid reports whether the field identifier is valid.
-func (f field) IsValid() bool {
-	return f != invalidField
-}
-
-// The pointer type below is for the new table-driven encoder/decoder.
-// The implementation here uses unsafe.Pointer to create a generic pointer.
-// In pointer_reflect.go we use reflect instead of unsafe to implement
-// the same (but slower) interface.
-type pointer struct {
-	p unsafe.Pointer
-}
-
-// size of pointer
-var ptrSize = unsafe.Sizeof(uintptr(0))
-
-// toPointer converts an interface of pointer type to a pointer
-// that points to the same target.
-func toPointer(i *Message) pointer {
-	// Super-tricky - read pointer out of data word of interface value.
-	// Saves ~25ns over the equivalent:
-	// return valToPointer(reflect.ValueOf(*i))
-	return pointer{p: (*[2]unsafe.Pointer)(unsafe.Pointer(i))[1]}
-}
-
-// toAddrPointer converts an interface to a pointer that points to
-// the interface data.
-func toAddrPointer(i *interface{}, isptr bool) pointer {
-	// Super-tricky - read or get the address of data word of interface value.
-	if isptr {
-		// The interface is of pointer type, thus it is a direct interface.
-		// The data word is the pointer data itself. We take its address.
-		return pointer{p: unsafe.Pointer(uintptr(unsafe.Pointer(i)) + ptrSize)}
-	}
-	// The interface is not of pointer type. The data word is the pointer
-	// to the data.
-	return pointer{p: (*[2]unsafe.Pointer)(unsafe.Pointer(i))[1]}
-}
-
-// valToPointer converts v to a pointer. v must be of pointer type.
-func valToPointer(v reflect.Value) pointer {
-	return pointer{p: unsafe.Pointer(v.Pointer())}
-}
-
-// offset converts from a pointer to a structure to a pointer to
-// one of its fields.
-func (p pointer) offset(f field) pointer {
-	// For safety, we should panic if !f.IsValid, however calling panic causes
-	// this to no longer be inlineable, which is a serious performance cost.
-	/*
-		if !f.IsValid() {
-			panic("invalid field")
-		}
-	*/
-	return pointer{p: unsafe.Pointer(uintptr(p.p) + uintptr(f))}
-}
-
-func (p pointer) isNil() bool {
-	return p.p == nil
-}
-
-func (p pointer) toInt64() *int64 {
-	return (*int64)(p.p)
-}
-func (p pointer) toInt64Ptr() **int64 {
-	return (**int64)(p.p)
-}
-func (p pointer) toInt64Slice() *[]int64 {
-	return (*[]int64)(p.p)
-}
-func (p pointer) toInt32() *int32 {
-	return (*int32)(p.p)
-}
-
-// See pointer_reflect.go for why toInt32Ptr/Slice doesn't exist.
-/*
-	func (p pointer) toInt32Ptr() **int32 {
-		return (**int32)(p.p)
-	}
-	func (p pointer) toInt32Slice() *[]int32 {
-		return (*[]int32)(p.p)
-	}
-*/
-func (p pointer) getInt32Ptr() *int32 {
-	return *(**int32)(p.p)
-}
-func (p pointer) setInt32Ptr(v int32) {
-	*(**int32)(p.p) = &v
-}
-
-// getInt32Slice loads a []int32 from p.
-// The value returned is aliased with the original slice.
-// This behavior differs from the implementation in pointer_reflect.go.
-func (p pointer) getInt32Slice() []int32 {
-	return *(*[]int32)(p.p)
-}
-
-// setInt32Slice stores a []int32 to p.
-// The value set is aliased with the input slice.
-// This behavior differs from the implementation in pointer_reflect.go.
-func (p pointer) setInt32Slice(v []int32) {
-	*(*[]int32)(p.p) = v
-}
-
-// TODO: Can we get rid of appendInt32Slice and use setInt32Slice instead?
-func (p pointer) appendInt32Slice(v int32) {
-	s := (*[]int32)(p.p)
-	*s = append(*s, v)
-}
-
-func (p pointer) toUint64() *uint64 {
-	return (*uint64)(p.p)
-}
-func (p pointer) toUint64Ptr() **uint64 {
-	return (**uint64)(p.p)
-}
-func (p pointer) toUint64Slice() *[]uint64 {
-	return (*[]uint64)(p.p)
-}
-func (p pointer) toUint32() *uint32 {
-	return (*uint32)(p.p)
-}
-func (p pointer) toUint32Ptr() **uint32 {
-	return (**uint32)(p.p)
-}
-func (p pointer) toUint32Slice() *[]uint32 {
-	return (*[]uint32)(p.p)
-}
-func (p pointer) toBool() *bool {
-	return (*bool)(p.p)
-}
-func (p pointer) toBoolPtr() **bool {
-	return (**bool)(p.p)
-}
-func (p pointer) toBoolSlice() *[]bool {
-	return (*[]bool)(p.p)
-}
-func (p pointer) toFloat64() *float64 {
-	return (*float64)(p.p)
-}
-func (p pointer) toFloat64Ptr() **float64 {
-	return (**float64)(p.p)
-}
-func (p pointer) toFloat64Slice() *[]float64 {
-	return (*[]float64)(p.p)
-}
-func (p pointer) toFloat32() *float32 {
-	return (*float32)(p.p)
-}
-func (p pointer) toFloat32Ptr() **float32 {
-	return (**float32)(p.p)
-}
-func (p pointer) toFloat32Slice() *[]float32 {
-	return (*[]float32)(p.p)
-}
-func (p pointer) toString() *string {
-	return (*string)(p.p)
-}
-func (p pointer) toStringPtr() **string {
-	return (**string)(p.p)
-}
-func (p pointer) toStringSlice() *[]string {
-	return (*[]string)(p.p)
-}
-func (p pointer) toBytes() *[]byte {
-	return (*[]byte)(p.p)
-}
-func (p pointer) toBytesSlice() *[][]byte {
-	return (*[][]byte)(p.p)
-}
-func (p pointer) toExtensions() *XXX_InternalExtensions {
-	return (*XXX_InternalExtensions)(p.p)
-}
-func (p pointer) toOldExtensions() *map[int32]Extension {
-	return (*map[int32]Extension)(p.p)
-}
-
-// getPointerSlice loads []*T from p as a []pointer.
-// The value returned is aliased with the original slice.
-// This behavior differs from the implementation in pointer_reflect.go.
-func (p pointer) getPointerSlice() []pointer {
-	// Super-tricky - p should point to a []*T where T is a
-	// message type. We load it as []pointer.
-	return *(*[]pointer)(p.p)
-}
-
-// setPointerSlice stores []pointer into p as a []*T.
-// The value set is aliased with the input slice.
-// This behavior differs from the implementation in pointer_reflect.go.
-func (p pointer) setPointerSlice(v []pointer) {
-	// Super-tricky - p should point to a []*T where T is a
-	// message type. We store it as []pointer.
-	*(*[]pointer)(p.p) = v
-}
-
-// getPointer loads the pointer at p and returns it.
-func (p pointer) getPointer() pointer {
-	return pointer{p: *(*unsafe.Pointer)(p.p)}
-}
-
-// setPointer stores the pointer q at p.
-func (p pointer) setPointer(q pointer) {
-	*(*unsafe.Pointer)(p.p) = q.p
-}
-
-// append q to the slice pointed to by p.
-func (p pointer) appendPointer(q pointer) {
-	s := (*[]unsafe.Pointer)(p.p)
-	*s = append(*s, q.p)
-}
-
-// getInterfacePointer returns a pointer that points to the
-// interface data of the interface pointed by p.
-func (p pointer) getInterfacePointer() pointer {
-	// Super-tricky - read pointer out of data word of interface value.
-	return pointer{p: (*(*[2]unsafe.Pointer)(p.p))[1]}
-}
-
-// asPointerTo returns a reflect.Value that is a pointer to an
-// object of type t stored at p.
-func (p pointer) asPointerTo(t reflect.Type) reflect.Value {
-	return reflect.NewAt(t, p.p)
-}
-
-func atomicLoadUnmarshalInfo(p **unmarshalInfo) *unmarshalInfo {
-	return (*unmarshalInfo)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(p))))
-}
-func atomicStoreUnmarshalInfo(p **unmarshalInfo, v *unmarshalInfo) {
-	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(p)), unsafe.Pointer(v))
-}
-func atomicLoadMarshalInfo(p **marshalInfo) *marshalInfo {
-	return (*marshalInfo)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(p))))
-}
-func atomicStoreMarshalInfo(p **marshalInfo, v *marshalInfo) {
-	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(p)), unsafe.Pointer(v))
-}
-func atomicLoadMergeInfo(p **mergeInfo) *mergeInfo {
-	return (*mergeInfo)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(p))))
-}
-func atomicStoreMergeInfo(p **mergeInfo, v *mergeInfo) {
-	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(p)), unsafe.Pointer(v))
-}
-func atomicLoadDiscardInfo(p **discardInfo) *discardInfo {
-	return (*discardInfo)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(p))))
-}
-func atomicStoreDiscardInfo(p **discardInfo, v *discardInfo) {
-	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(p)), unsafe.Pointer(v))
-}

vendor/github.com/golang/protobuf/proto/properties.go

@@ -1,544 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package proto
-
-/*
- * Routines for encoding data into the wire format for protocol buffers.
- */
-
-import (
-	"fmt"
-	"log"
-	"os"
-	"reflect"
-	"sort"
-	"strconv"
-	"strings"
-	"sync"
-)
-
-const debug bool = false
-
-// Constants that identify the encoding of a value on the wire.
-const (
-	WireVarint     = 0
-	WireFixed64    = 1
-	WireBytes      = 2
-	WireStartGroup = 3
-	WireEndGroup   = 4
-	WireFixed32    = 5
-)
-
-// tagMap is an optimization over map[int]int for typical protocol buffer
-// use-cases. Encoded protocol buffers are often in tag order with small tag
-// numbers.
-type tagMap struct {
-	fastTags []int
-	slowTags map[int]int
-}
-
-// tagMapFastLimit is the upper bound on the tag number that will be stored in
-// the tagMap slice rather than its map.
-const tagMapFastLimit = 1024
-
-func (p *tagMap) get(t int) (int, bool) {
-	if t > 0 && t < tagMapFastLimit {
-		if t >= len(p.fastTags) {
-			return 0, false
-		}
-		fi := p.fastTags[t]
-		return fi, fi >= 0
-	}
-	fi, ok := p.slowTags[t]
-	return fi, ok
-}
-
-func (p *tagMap) put(t int, fi int) {
-	if t > 0 && t < tagMapFastLimit {
-		for len(p.fastTags) < t+1 {
-			p.fastTags = append(p.fastTags, -1)
-		}
-		p.fastTags[t] = fi
-		return
-	}
-	if p.slowTags == nil {
-		p.slowTags = make(map[int]int)
-	}
-	p.slowTags[t] = fi
-}
-
-// StructProperties represents properties for all the fields of a struct.
-// decoderTags and decoderOrigNames should only be used by the decoder.
-type StructProperties struct {
-	Prop             []*Properties  // properties for each field
-	reqCount         int            // required count
-	decoderTags      tagMap         // map from proto tag to struct field number
-	decoderOrigNames map[string]int // map from original name to struct field number
-	order            []int          // list of struct field numbers in tag order
-
-	// OneofTypes contains information about the oneof fields in this message.
-	// It is keyed by the original name of a field.
-	OneofTypes map[string]*OneofProperties
-}
-
-// OneofProperties represents information about a specific field in a oneof.
-type OneofProperties struct {
-	Type  reflect.Type // pointer to generated struct type for this oneof field
-	Field int          // struct field number of the containing oneof in the message
-	Prop  *Properties
-}
-
-// Implement the sorting interface so we can sort the fields in tag order, as recommended by the spec.
-// See encode.go, (*Buffer).enc_struct.
-
-func (sp *StructProperties) Len() int { return len(sp.order) }
-func (sp *StructProperties) Less(i, j int) bool {
-	return sp.Prop[sp.order[i]].Tag < sp.Prop[sp.order[j]].Tag
-}
-func (sp *StructProperties) Swap(i, j int) { sp.order[i], sp.order[j] = sp.order[j], sp.order[i] }
-
-// Properties represents the protocol-specific behavior of a single struct field.
-type Properties struct {
-	Name     string // name of the field, for error messages
-	OrigName string // original name before protocol compiler (always set)
-	JSONName string // name to use for JSON; determined by protoc
-	Wire     string
-	WireType int
-	Tag      int
-	Required bool
-	Optional bool
-	Repeated bool
-	Packed   bool   // relevant for repeated primitives only
-	Enum     string // set for enum types only
-	proto3   bool   // whether this is known to be a proto3 field
-	oneof    bool   // whether this is a oneof field
-
-	Default    string // default value
-	HasDefault bool   // whether an explicit default was provided
-
-	stype reflect.Type      // set for struct types only
-	sprop *StructProperties // set for struct types only
-
-	mtype      reflect.Type // set for map types only
-	MapKeyProp *Properties  // set for map types only
-	MapValProp *Properties  // set for map types only
-}
-
-// String formats the properties in the protobuf struct field tag style.
-func (p *Properties) String() string {
-	s := p.Wire
-	s += ","
-	s += strconv.Itoa(p.Tag)
-	if p.Required {
-		s += ",req"
-	}
-	if p.Optional {
-		s += ",opt"
-	}
-	if p.Repeated {
-		s += ",rep"
-	}
-	if p.Packed {
-		s += ",packed"
-	}
-	s += ",name=" + p.OrigName
-	if p.JSONName != p.OrigName {
-		s += ",json=" + p.JSONName
-	}
-	if p.proto3 {
-		s += ",proto3"
-	}
-	if p.oneof {
-		s += ",oneof"
-	}
-	if len(p.Enum) > 0 {
-		s += ",enum=" + p.Enum
-	}
-	if p.HasDefault {
-		s += ",def=" + p.Default
-	}
-	return s
-}
-
-// Parse populates p by parsing a string in the protobuf struct field tag style.
-func (p *Properties) Parse(s string) {
-	// "bytes,49,opt,name=foo,def=hello!"
-	fields := strings.Split(s, ",") // breaks def=, but handled below.
-	if len(fields) < 2 {
-		fmt.Fprintf(os.Stderr, "proto: tag has too few fields: %q\n", s)
-		return
-	}
-
-	p.Wire = fields[0]
-	switch p.Wire {
-	case "varint":
-		p.WireType = WireVarint
-	case "fixed32":
-		p.WireType = WireFixed32
-	case "fixed64":
-		p.WireType = WireFixed64
-	case "zigzag32":
-		p.WireType = WireVarint
-	case "zigzag64":
-		p.WireType = WireVarint
-	case "bytes", "group":
-		p.WireType = WireBytes
-		// no numeric converter for non-numeric types
-	default:
-		fmt.Fprintf(os.Stderr, "proto: tag has unknown wire type: %q\n", s)
-		return
-	}
-
-	var err error
-	p.Tag, err = strconv.Atoi(fields[1])
-	if err != nil {
-		return
-	}
-
-outer:
-	for i := 2; i < len(fields); i++ {
-		f := fields[i]
-		switch {
-		case f == "req":
-			p.Required = true
-		case f == "opt":
-			p.Optional = true
-		case f == "rep":
-			p.Repeated = true
-		case f == "packed":
-			p.Packed = true
-		case strings.HasPrefix(f, "name="):
-			p.OrigName = f[5:]
-		case strings.HasPrefix(f, "json="):
-			p.JSONName = f[5:]
-		case strings.HasPrefix(f, "enum="):
-			p.Enum = f[5:]
-		case f == "proto3":
-			p.proto3 = true
-		case f == "oneof":
-			p.oneof = true
-		case strings.HasPrefix(f, "def="):
-			p.HasDefault = true
-			p.Default = f[4:] // rest of string
-			if i+1 < len(fields) {
-				// Commas aren't escaped, and def is always last.
-				p.Default += "," + strings.Join(fields[i+1:], ",")
-				break outer
-			}
-		}
-	}
-}
-
-var protoMessageType = reflect.TypeOf((*Message)(nil)).Elem()
-
-// setFieldProps initializes the field properties for submessages and maps.
-func (p *Properties) setFieldProps(typ reflect.Type, f *reflect.StructField, lockGetProp bool) {
-	switch t1 := typ; t1.Kind() {
-	case reflect.Ptr:
-		if t1.Elem().Kind() == reflect.Struct {
-			p.stype = t1.Elem()
-		}
-
-	case reflect.Slice:
-		if t2 := t1.Elem(); t2.Kind() == reflect.Ptr && t2.Elem().Kind() == reflect.Struct {
-			p.stype = t2.Elem()
-		}
-
-	case reflect.Map:
-		p.mtype = t1
-		p.MapKeyProp = &Properties{}
-		p.MapKeyProp.init(reflect.PtrTo(p.mtype.Key()), "Key", f.Tag.Get("protobuf_key"), nil, lockGetProp)
-		p.MapValProp = &Properties{}
-		vtype := p.mtype.Elem()
-		if vtype.Kind() != reflect.Ptr && vtype.Kind() != reflect.Slice {
-			// The value type is not a message (*T) or bytes ([]byte),
-			// so we need encoders for the pointer to this type.
-			vtype = reflect.PtrTo(vtype)
-		}
-		p.MapValProp.init(vtype, "Value", f.Tag.Get("protobuf_val"), nil, lockGetProp)
-	}
-
-	if p.stype != nil {
-		if lockGetProp {
-			p.sprop = GetProperties(p.stype)
-		} else {
-			p.sprop = getPropertiesLocked(p.stype)
-		}
-	}
-}
-
-var (
-	marshalerType = reflect.TypeOf((*Marshaler)(nil)).Elem()
-)
-
-// Init populates the properties from a protocol buffer struct tag.
-func (p *Properties) Init(typ reflect.Type, name, tag string, f *reflect.StructField) {
-	p.init(typ, name, tag, f, true)
-}
-
-func (p *Properties) init(typ reflect.Type, name, tag string, f *reflect.StructField, lockGetProp bool) {
-	// "bytes,49,opt,def=hello!"
-	p.Name = name
-	p.OrigName = name
-	if tag == "" {
-		return
-	}
-	p.Parse(tag)
-	p.setFieldProps(typ, f, lockGetProp)
-}
-
-var (
-	propertiesMu  sync.RWMutex
-	propertiesMap = make(map[reflect.Type]*StructProperties)
-)
-
-// GetProperties returns the list of properties for the type represented by t.
-// t must represent a generated struct type of a protocol message.
-func GetProperties(t reflect.Type) *StructProperties {
-	if t.Kind() != reflect.Struct {
-		panic("proto: type must have kind struct")
-	}
-
-	// Most calls to GetProperties in a long-running program will be
-	// retrieving details for types we have seen before.
-	propertiesMu.RLock()
-	sprop, ok := propertiesMap[t]
-	propertiesMu.RUnlock()
-	if ok {
-		if collectStats {
-			stats.Chit++
-		}
-		return sprop
-	}
-
-	propertiesMu.Lock()
-	sprop = getPropertiesLocked(t)
-	propertiesMu.Unlock()
-	return sprop
-}
-
-// getPropertiesLocked requires that propertiesMu is held.
-func getPropertiesLocked(t reflect.Type) *StructProperties {
-	if prop, ok := propertiesMap[t]; ok {
-		if collectStats {
-			stats.Chit++
-		}
-		return prop
-	}
-	if collectStats {
-		stats.Cmiss++
-	}
-
-	prop := new(StructProperties)
-	// in case of recursive protos, fill this in now.
-	propertiesMap[t] = prop
-
-	// build properties
-	prop.Prop = make([]*Properties, t.NumField())
-	prop.order = make([]int, t.NumField())
-
-	for i := 0; i < t.NumField(); i++ {
-		f := t.Field(i)
-		p := new(Properties)
-		name := f.Name
-		p.init(f.Type, name, f.Tag.Get("protobuf"), &f, false)
-
-		oneof := f.Tag.Get("protobuf_oneof") // special case
-		if oneof != "" {
-			// Oneof fields don't use the traditional protobuf tag.
-			p.OrigName = oneof
-		}
-		prop.Prop[i] = p
-		prop.order[i] = i
-		if debug {
-			print(i, " ", f.Name, " ", t.String(), " ")
-			if p.Tag > 0 {
-				print(p.String())
-			}
-			print("\n")
-		}
-	}
-
-	// Re-order prop.order.
-	sort.Sort(prop)
-
-	type oneofMessage interface {
-		XXX_OneofFuncs() (func(Message, *Buffer) error, func(Message, int, int, *Buffer) (bool, error), func(Message) int, []interface{})
-	}
-	if om, ok := reflect.Zero(reflect.PtrTo(t)).Interface().(oneofMessage); ok {
-		var oots []interface{}
-		_, _, _, oots = om.XXX_OneofFuncs()
-
-		// Interpret oneof metadata.
-		prop.OneofTypes = make(map[string]*OneofProperties)
-		for _, oot := range oots {
-			oop := &OneofProperties{
-				Type: reflect.ValueOf(oot).Type(), // *T
-				Prop: new(Properties),
-			}
-			sft := oop.Type.Elem().Field(0)
-			oop.Prop.Name = sft.Name
-			oop.Prop.Parse(sft.Tag.Get("protobuf"))
-			// There will be exactly one interface field that
-			// this new value is assignable to.
-			for i := 0; i < t.NumField(); i++ {
-				f := t.Field(i)
-				if f.Type.Kind() != reflect.Interface {
-					continue
-				}
-				if !oop.Type.AssignableTo(f.Type) {
-					continue
-				}
-				oop.Field = i
-				break
-			}
-			prop.OneofTypes[oop.Prop.OrigName] = oop
-		}
-	}
-
-	// build required counts
-	// build tags
-	reqCount := 0
-	prop.decoderOrigNames = make(map[string]int)
-	for i, p := range prop.Prop {
-		if strings.HasPrefix(p.Name, "XXX_") {
-			// Internal fields should not appear in tags/origNames maps.
-			// They are handled specially when encoding and decoding.
-			continue
-		}
-		if p.Required {
-			reqCount++
-		}
-		prop.decoderTags.put(p.Tag, i)
-		prop.decoderOrigNames[p.OrigName] = i
-	}
-	prop.reqCount = reqCount
-
-	return prop
-}
-
-// A global registry of enum types.
-// The generated code will register the generated maps by calling RegisterEnum.
-
-var enumValueMaps = make(map[string]map[string]int32)
-
-// RegisterEnum is called from the generated code to install the enum descriptor
-// maps into the global table to aid parsing text format protocol buffers.
-func RegisterEnum(typeName string, unusedNameMap map[int32]string, valueMap map[string]int32) {
-	if _, ok := enumValueMaps[typeName]; ok {
-		panic("proto: duplicate enum registered: " + typeName)
-	}
-	enumValueMaps[typeName] = valueMap
-}
-
-// EnumValueMap returns the mapping from names to integers of the
-// enum type enumType, or a nil if not found.
-func EnumValueMap(enumType string) map[string]int32 {
-	return enumValueMaps[enumType]
-}
-
-// A registry of all linked message types.
-// The string is a fully-qualified proto name ("pkg.Message").
-var (
-	protoTypedNils = make(map[string]Message)      // a map from proto names to typed nil pointers
-	protoMapTypes  = make(map[string]reflect.Type) // a map from proto names to map types
-	revProtoTypes  = make(map[reflect.Type]string)
-)
-
-// RegisterType is called from generated code and maps from the fully qualified
-// proto name to the type (pointer to struct) of the protocol buffer.
-func RegisterType(x Message, name string) {
-	if _, ok := protoTypedNils[name]; ok {
-		// TODO: Some day, make this a panic.
-		log.Printf("proto: duplicate proto type registered: %s", name)
-		return
-	}
-	t := reflect.TypeOf(x)
-	if v := reflect.ValueOf(x); v.Kind() == reflect.Ptr && v.Pointer() == 0 {
-		// Generated code always calls RegisterType with nil x.
-		// This check is just for extra safety.
-		protoTypedNils[name] = x
-	} else {
-		protoTypedNils[name] = reflect.Zero(t).Interface().(Message)
-	}
-	revProtoTypes[t] = name
-}
-
-// RegisterMapType is called from generated code and maps from the fully qualified
-// proto name to the native map type of the proto map definition.
-func RegisterMapType(x interface{}, name string) {
-	if reflect.TypeOf(x).Kind() != reflect.Map {
-		panic(fmt.Sprintf("RegisterMapType(%T, %q); want map", x, name))
-	}
-	if _, ok := protoMapTypes[name]; ok {
-		log.Printf("proto: duplicate proto type registered: %s", name)
-		return
-	}
-	t := reflect.TypeOf(x)
-	protoMapTypes[name] = t
-	revProtoTypes[t] = name
-}
-
-// MessageName returns the fully-qualified proto name for the given message type.
-func MessageName(x Message) string {
-	type xname interface {
-		XXX_MessageName() string
-	}
-	if m, ok := x.(xname); ok {
-		return m.XXX_MessageName()
-	}
-	return revProtoTypes[reflect.TypeOf(x)]
-}
-
-// MessageType returns the message type (pointer to struct) for a named message.
-// The type is not guaranteed to implement proto.Message if the name refers to a
-// map entry.
-func MessageType(name string) reflect.Type {
-	if t, ok := protoTypedNils[name]; ok {
-		return reflect.TypeOf(t)
-	}
-	return protoMapTypes[name]
-}
-
-// A registry of all linked proto files.
-var (
-	protoFiles = make(map[string][]byte) // file name => fileDescriptor
-)
-
-// RegisterFile is called from generated code and maps from the
-// full file name of a .proto file to its compressed FileDescriptorProto.
-func RegisterFile(filename string, fileDescriptor []byte) {
-	protoFiles[filename] = fileDescriptor
-}
-
-// FileDescriptor returns the compressed FileDescriptorProto for a .proto file.
-func FileDescriptor(filename string) []byte { return protoFiles[filename] }

vendor/github.com/golang/protobuf/proto/table_merge.go

@@ -1,654 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2016 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package proto
-
-import (
-	"fmt"
-	"reflect"
-	"strings"
-	"sync"
-	"sync/atomic"
-)
-
-// Merge merges the src message into dst.
-// This assumes that dst and src of the same type and are non-nil.
-func (a *InternalMessageInfo) Merge(dst, src Message) {
-	mi := atomicLoadMergeInfo(&a.merge)
-	if mi == nil {
-		mi = getMergeInfo(reflect.TypeOf(dst).Elem())
-		atomicStoreMergeInfo(&a.merge, mi)
-	}
-	mi.merge(toPointer(&dst), toPointer(&src))
-}
-
-type mergeInfo struct {
-	typ reflect.Type
-
-	initialized int32 // 0: only typ is valid, 1: everything is valid
-	lock        sync.Mutex
-
-	fields       []mergeFieldInfo
-	unrecognized field // Offset of XXX_unrecognized
-}
-
-type mergeFieldInfo struct {
-	field field // Offset of field, guaranteed to be valid
-
-	// isPointer reports whether the value in the field is a pointer.
-	// This is true for the following situations:
-	//	* Pointer to struct
-	//	* Pointer to basic type (proto2 only)
-	//	* Slice (first value in slice header is a pointer)
-	//	* String (first value in string header is a pointer)
-	isPointer bool
-
-	// basicWidth reports the width of the field assuming that it is directly
-	// embedded in the struct (as is the case for basic types in proto3).
-	// The possible values are:
-	// 	0: invalid
-	//	1: bool
-	//	4: int32, uint32, float32
-	//	8: int64, uint64, float64
-	basicWidth int
-
-	// Where dst and src are pointers to the types being merged.
-	merge func(dst, src pointer)
-}
-
-var (
-	mergeInfoMap  = map[reflect.Type]*mergeInfo{}
-	mergeInfoLock sync.Mutex
-)
-
-func getMergeInfo(t reflect.Type) *mergeInfo {
-	mergeInfoLock.Lock()
-	defer mergeInfoLock.Unlock()
-	mi := mergeInfoMap[t]
-	if mi == nil {
-		mi = &mergeInfo{typ: t}
-		mergeInfoMap[t] = mi
-	}
-	return mi
-}
-
-// merge merges src into dst assuming they are both of type *mi.typ.
-func (mi *mergeInfo) merge(dst, src pointer) {
-	if dst.isNil() {
-		panic("proto: nil destination")
-	}
-	if src.isNil() {
-		return // Nothing to do.
-	}
-
-	if atomic.LoadInt32(&mi.initialized) == 0 {
-		mi.computeMergeInfo()
-	}
-
-	for _, fi := range mi.fields {
-		sfp := src.offset(fi.field)
-
-		// As an optimization, we can avoid the merge function call cost
-		// if we know for sure that the source will have no effect
-		// by checking if it is the zero value.
-		if unsafeAllowed {
-			if fi.isPointer && sfp.getPointer().isNil() { // Could be slice or string
-				continue
-			}
-			if fi.basicWidth > 0 {
-				switch {
-				case fi.basicWidth == 1 && !*sfp.toBool():
-					continue
-				case fi.basicWidth == 4 && *sfp.toUint32() == 0:
-					continue
-				case fi.basicWidth == 8 && *sfp.toUint64() == 0:
-					continue
-				}
-			}
-		}
-
-		dfp := dst.offset(fi.field)
-		fi.merge(dfp, sfp)
-	}
-
-	// TODO: Make this faster?
-	out := dst.asPointerTo(mi.typ).Elem()
-	in := src.asPointerTo(mi.typ).Elem()
-	if emIn, err := extendable(in.Addr().Interface()); err == nil {
-		emOut, _ := extendable(out.Addr().Interface())
-		mIn, muIn := emIn.extensionsRead()
-		if mIn != nil {
-			mOut := emOut.extensionsWrite()
-			muIn.Lock()
-			mergeExtension(mOut, mIn)
-			muIn.Unlock()
-		}
-	}
-
-	if mi.unrecognized.IsValid() {
-		if b := *src.offset(mi.unrecognized).toBytes(); len(b) > 0 {
-			*dst.offset(mi.unrecognized).toBytes() = append([]byte(nil), b...)
-		}
-	}
-}
-
-func (mi *mergeInfo) computeMergeInfo() {
-	mi.lock.Lock()
-	defer mi.lock.Unlock()
-	if mi.initialized != 0 {
-		return
-	}
-	t := mi.typ
-	n := t.NumField()
-
-	props := GetProperties(t)
-	for i := 0; i < n; i++ {
-		f := t.Field(i)
-		if strings.HasPrefix(f.Name, "XXX_") {
-			continue
-		}
-
-		mfi := mergeFieldInfo{field: toField(&f)}
-		tf := f.Type
-
-		// As an optimization, we can avoid the merge function call cost
-		// if we know for sure that the source will have no effect
-		// by checking if it is the zero value.
-		if unsafeAllowed {
-			switch tf.Kind() {
-			case reflect.Ptr, reflect.Slice, reflect.String:
-				// As a special case, we assume slices and strings are pointers
-				// since we know that the first field in the SliceSlice or
-				// StringHeader is a data pointer.
-				mfi.isPointer = true
-			case reflect.Bool:
-				mfi.basicWidth = 1
-			case reflect.Int32, reflect.Uint32, reflect.Float32:
-				mfi.basicWidth = 4
-			case reflect.Int64, reflect.Uint64, reflect.Float64:
-				mfi.basicWidth = 8
-			}
-		}
-
-		// Unwrap tf to get at its most basic type.
-		var isPointer, isSlice bool
-		if tf.Kind() == reflect.Slice && tf.Elem().Kind() != reflect.Uint8 {
-			isSlice = true
-			tf = tf.Elem()
-		}
-		if tf.Kind() == reflect.Ptr {
-			isPointer = true
-			tf = tf.Elem()
-		}
-		if isPointer && isSlice && tf.Kind() != reflect.Struct {
-			panic("both pointer and slice for basic type in " + tf.Name())
-		}
-
-		switch tf.Kind() {
-		case reflect.Int32:
-			switch {
-			case isSlice: // E.g., []int32
-				mfi.merge = func(dst, src pointer) {
-					// NOTE: toInt32Slice is not defined (see pointer_reflect.go).
-					/*
-						sfsp := src.toInt32Slice()
-						if *sfsp != nil {
-							dfsp := dst.toInt32Slice()
-							*dfsp = append(*dfsp, *sfsp...)
-							if *dfsp == nil {
-								*dfsp = []int64{}
-							}
-						}
-					*/
-					sfs := src.getInt32Slice()
-					if sfs != nil {
-						dfs := dst.getInt32Slice()
-						dfs = append(dfs, sfs...)
-						if dfs == nil {
-							dfs = []int32{}
-						}
-						dst.setInt32Slice(dfs)
-					}
-				}
-			case isPointer: // E.g., *int32
-				mfi.merge = func(dst, src pointer) {
-					// NOTE: toInt32Ptr is not defined (see pointer_reflect.go).
-					/*
-						sfpp := src.toInt32Ptr()
-						if *sfpp != nil {
-							dfpp := dst.toInt32Ptr()
-							if *dfpp == nil {
-								*dfpp = Int32(**sfpp)
-							} else {
-								**dfpp = **sfpp
-							}
-						}
-					*/
-					sfp := src.getInt32Ptr()
-					if sfp != nil {
-						dfp := dst.getInt32Ptr()
-						if dfp == nil {
-							dst.setInt32Ptr(*sfp)
-						} else {
-							*dfp = *sfp
-						}
-					}
-				}
-			default: // E.g., int32
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toInt32(); v != 0 {
-						*dst.toInt32() = v
-					}
-				}
-			}
-		case reflect.Int64:
-			switch {
-			case isSlice: // E.g., []int64
-				mfi.merge = func(dst, src pointer) {
-					sfsp := src.toInt64Slice()
-					if *sfsp != nil {
-						dfsp := dst.toInt64Slice()
-						*dfsp = append(*dfsp, *sfsp...)
-						if *dfsp == nil {
-							*dfsp = []int64{}
-						}
-					}
-				}
-			case isPointer: // E.g., *int64
-				mfi.merge = func(dst, src pointer) {
-					sfpp := src.toInt64Ptr()
-					if *sfpp != nil {
-						dfpp := dst.toInt64Ptr()
-						if *dfpp == nil {
-							*dfpp = Int64(**sfpp)
-						} else {
-							**dfpp = **sfpp
-						}
-					}
-				}
-			default: // E.g., int64
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toInt64(); v != 0 {
-						*dst.toInt64() = v
-					}
-				}
-			}
-		case reflect.Uint32:
-			switch {
-			case isSlice: // E.g., []uint32
-				mfi.merge = func(dst, src pointer) {
-					sfsp := src.toUint32Slice()
-					if *sfsp != nil {
-						dfsp := dst.toUint32Slice()
-						*dfsp = append(*dfsp, *sfsp...)
-						if *dfsp == nil {
-							*dfsp = []uint32{}
-						}
-					}
-				}
-			case isPointer: // E.g., *uint32
-				mfi.merge = func(dst, src pointer) {
-					sfpp := src.toUint32Ptr()
-					if *sfpp != nil {
-						dfpp := dst.toUint32Ptr()
-						if *dfpp == nil {
-							*dfpp = Uint32(**sfpp)
-						} else {
-							**dfpp = **sfpp
-						}
-					}
-				}
-			default: // E.g., uint32
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toUint32(); v != 0 {
-						*dst.toUint32() = v
-					}
-				}
-			}
-		case reflect.Uint64:
-			switch {
-			case isSlice: // E.g., []uint64
-				mfi.merge = func(dst, src pointer) {
-					sfsp := src.toUint64Slice()
-					if *sfsp != nil {
-						dfsp := dst.toUint64Slice()
-						*dfsp = append(*dfsp, *sfsp...)
-						if *dfsp == nil {
-							*dfsp = []uint64{}
-						}
-					}
-				}
-			case isPointer: // E.g., *uint64
-				mfi.merge = func(dst, src pointer) {
-					sfpp := src.toUint64Ptr()
-					if *sfpp != nil {
-						dfpp := dst.toUint64Ptr()
-						if *dfpp == nil {
-							*dfpp = Uint64(**sfpp)
-						} else {
-							**dfpp = **sfpp
-						}
-					}
-				}
-			default: // E.g., uint64
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toUint64(); v != 0 {
-						*dst.toUint64() = v
-					}
-				}
-			}
-		case reflect.Float32:
-			switch {
-			case isSlice: // E.g., []float32
-				mfi.merge = func(dst, src pointer) {
-					sfsp := src.toFloat32Slice()
-					if *sfsp != nil {
-						dfsp := dst.toFloat32Slice()
-						*dfsp = append(*dfsp, *sfsp...)
-						if *dfsp == nil {
-							*dfsp = []float32{}
-						}
-					}
-				}
-			case isPointer: // E.g., *float32
-				mfi.merge = func(dst, src pointer) {
-					sfpp := src.toFloat32Ptr()
-					if *sfpp != nil {
-						dfpp := dst.toFloat32Ptr()
-						if *dfpp == nil {
-							*dfpp = Float32(**sfpp)
-						} else {
-							**dfpp = **sfpp
-						}
-					}
-				}
-			default: // E.g., float32
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toFloat32(); v != 0 {
-						*dst.toFloat32() = v
-					}
-				}
-			}
-		case reflect.Float64:
-			switch {
-			case isSlice: // E.g., []float64
-				mfi.merge = func(dst, src pointer) {
-					sfsp := src.toFloat64Slice()
-					if *sfsp != nil {
-						dfsp := dst.toFloat64Slice()
-						*dfsp = append(*dfsp, *sfsp...)
-						if *dfsp == nil {
-							*dfsp = []float64{}
-						}
-					}
-				}
-			case isPointer: // E.g., *float64
-				mfi.merge = func(dst, src pointer) {
-					sfpp := src.toFloat64Ptr()
-					if *sfpp != nil {
-						dfpp := dst.toFloat64Ptr()
-						if *dfpp == nil {
-							*dfpp = Float64(**sfpp)
-						} else {
-							**dfpp = **sfpp
-						}
-					}
-				}
-			default: // E.g., float64
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toFloat64(); v != 0 {
-						*dst.toFloat64() = v
-					}
-				}
-			}
-		case reflect.Bool:
-			switch {
-			case isSlice: // E.g., []bool
-				mfi.merge = func(dst, src pointer) {
-					sfsp := src.toBoolSlice()
-					if *sfsp != nil {
-						dfsp := dst.toBoolSlice()
-						*dfsp = append(*dfsp, *sfsp...)
-						if *dfsp == nil {
-							*dfsp = []bool{}
-						}
-					}
-				}
-			case isPointer: // E.g., *bool
-				mfi.merge = func(dst, src pointer) {
-					sfpp := src.toBoolPtr()
-					if *sfpp != nil {
-						dfpp := dst.toBoolPtr()
-						if *dfpp == nil {
-							*dfpp = Bool(**sfpp)
-						} else {
-							**dfpp = **sfpp
-						}
-					}
-				}
-			default: // E.g., bool
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toBool(); v {
-						*dst.toBool() = v
-					}
-				}
-			}
-		case reflect.String:
-			switch {
-			case isSlice: // E.g., []string
-				mfi.merge = func(dst, src pointer) {
-					sfsp := src.toStringSlice()
-					if *sfsp != nil {
-						dfsp := dst.toStringSlice()
-						*dfsp = append(*dfsp, *sfsp...)
-						if *dfsp == nil {
-							*dfsp = []string{}
-						}
-					}
-				}
-			case isPointer: // E.g., *string
-				mfi.merge = func(dst, src pointer) {
-					sfpp := src.toStringPtr()
-					if *sfpp != nil {
-						dfpp := dst.toStringPtr()
-						if *dfpp == nil {
-							*dfpp = String(**sfpp)
-						} else {
-							**dfpp = **sfpp
-						}
-					}
-				}
-			default: // E.g., string
-				mfi.merge = func(dst, src pointer) {
-					if v := *src.toString(); v != "" {
-						*dst.toString() = v
-					}
-				}
-			}
-		case reflect.Slice:
-			isProto3 := props.Prop[i].proto3
-			switch {
-			case isPointer:
-				panic("bad pointer in byte slice case in " + tf.Name())
-			case tf.Elem().Kind() != reflect.Uint8:
-				panic("bad element kind in byte slice case in " + tf.Name())
-			case isSlice: // E.g., [][]byte
-				mfi.merge = func(dst, src pointer) {
-					sbsp := src.toBytesSlice()
-					if *sbsp != nil {
-						dbsp := dst.toBytesSlice()
-						for _, sb := range *sbsp {
-							if sb == nil {
-								*dbsp = append(*dbsp, nil)
-							} else {
-								*dbsp = append(*dbsp, append([]byte{}, sb...))
-							}
-						}
-						if *dbsp == nil {
-							*dbsp = [][]byte{}
-						}
-					}
-				}
-			default: // E.g., []byte
-				mfi.merge = func(dst, src pointer) {
-					sbp := src.toBytes()
-					if *sbp != nil {
-						dbp := dst.toBytes()
-						if !isProto3 || len(*sbp) > 0 {
-							*dbp = append([]byte{}, *sbp...)
-						}
-					}
-				}
-			}
-		case reflect.Struct:
-			switch {
-			case !isPointer:
-				panic(fmt.Sprintf("message field %s without pointer", tf))
-			case isSlice: // E.g., []*pb.T
-				mi := getMergeInfo(tf)
-				mfi.merge = func(dst, src pointer) {
-					sps := src.getPointerSlice()
-					if sps != nil {
-						dps := dst.getPointerSlice()
-						for _, sp := range sps {
-							var dp pointer
-							if !sp.isNil() {
-								dp = valToPointer(reflect.New(tf))
-								mi.merge(dp, sp)
-							}
-							dps = append(dps, dp)
-						}
-						if dps == nil {
-							dps = []pointer{}
-						}
-						dst.setPointerSlice(dps)
-					}
-				}
-			default: // E.g., *pb.T
-				mi := getMergeInfo(tf)
-				mfi.merge = func(dst, src pointer) {
-					sp := src.getPointer()
-					if !sp.isNil() {
-						dp := dst.getPointer()
-						if dp.isNil() {
-							dp = valToPointer(reflect.New(tf))
-							dst.setPointer(dp)
-						}
-						mi.merge(dp, sp)
-					}
-				}
-			}
-		case reflect.Map:
-			switch {
-			case isPointer || isSlice:
-				panic("bad pointer or slice in map case in " + tf.Name())
-			default: // E.g., map[K]V
-				mfi.merge = func(dst, src pointer) {
-					sm := src.asPointerTo(tf).Elem()
-					if sm.Len() == 0 {
-						return
-					}
-					dm := dst.asPointerTo(tf).Elem()
-					if dm.IsNil() {
-						dm.Set(reflect.MakeMap(tf))
-					}
-
-					switch tf.Elem().Kind() {
-					case reflect.Ptr: // Proto struct (e.g., *T)
-						for _, key := range sm.MapKeys() {
-							val := sm.MapIndex(key)
-							val = reflect.ValueOf(Clone(val.Interface().(Message)))
-							dm.SetMapIndex(key, val)
-						}
-					case reflect.Slice: // E.g. Bytes type (e.g., []byte)
-						for _, key := range sm.MapKeys() {
-							val := sm.MapIndex(key)
-							val = reflect.ValueOf(append([]byte{}, val.Bytes()...))
-							dm.SetMapIndex(key, val)
-						}
-					default: // Basic type (e.g., string)
-						for _, key := range sm.MapKeys() {
-							val := sm.MapIndex(key)
-							dm.SetMapIndex(key, val)
-						}
-					}
-				}
-			}
-		case reflect.Interface:
-			// Must be oneof field.
-			switch {
-			case isPointer || isSlice:
-				panic("bad pointer or slice in interface case in " + tf.Name())
-			default: // E.g., interface{}
-				// TODO: Make this faster?
-				mfi.merge = func(dst, src pointer) {
-					su := src.asPointerTo(tf).Elem()
-					if !su.IsNil() {
-						du := dst.asPointerTo(tf).Elem()
-						typ := su.Elem().Type()
-						if du.IsNil() || du.Elem().Type() != typ {
-							du.Set(reflect.New(typ.Elem())) // Initialize interface if empty
-						}
-						sv := su.Elem().Elem().Field(0)
-						if sv.Kind() == reflect.Ptr && sv.IsNil() {
-							return
-						}
-						dv := du.Elem().Elem().Field(0)
-						if dv.Kind() == reflect.Ptr && dv.IsNil() {
-							dv.Set(reflect.New(sv.Type().Elem())) // Initialize proto message if empty
-						}
-						switch sv.Type().Kind() {
-						case reflect.Ptr: // Proto struct (e.g., *T)
-							Merge(dv.Interface().(Message), sv.Interface().(Message))
-						case reflect.Slice: // E.g. Bytes type (e.g., []byte)
-							dv.Set(reflect.ValueOf(append([]byte{}, sv.Bytes()...)))
-						default: // Basic type (e.g., string)
-							dv.Set(sv)
-						}
-					}
-				}
-			}
-		default:
-			panic(fmt.Sprintf("merger not found for type:%s", tf))
-		}
-		mi.fields = append(mi.fields, mfi)
-	}
-
-	mi.unrecognized = invalidField
-	if f, ok := t.FieldByName("XXX_unrecognized"); ok {
-		if f.Type != reflect.TypeOf([]byte{}) {
-			panic("expected XXX_unrecognized to be of type []byte")
-		}
-		mi.unrecognized = toField(&f)
-	}
-
-	atomic.StoreInt32(&mi.initialized, 1)
-}