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