*: add staticcheck target back

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Makefile

@@ -11,14 +11,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# By being first, this takes over plain `make`. It cuts out `staticcheck`
-# because in the circleci/golang:1.11 image it chokes on the go module cache.
-default: precheck style unused build test
-
 include Makefile.common
 
-STATICCHECK_IGNORE = \
+STATICCHECK_IGNORE =
-  github.com/prometheus/statsd_exporter/main.go:SA1019 \
 
 DOCKER_IMAGE_NAME       ?= statsd-exporter
 

Makefile.common

@@ -29,6 +29,8 @@ GO           ?= go
 GOFMT        ?= $(GO)fmt
 FIRST_GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
 GOOPTS       ?=
+GOHOSTOS     ?= $(shell $(GO) env GOHOSTOS)
+GOHOSTARCH   ?= $(shell $(GO) env GOHOSTARCH)
 
 GO_VERSION        ?= $(shell $(GO) version)
 GO_VERSION_NUMBER ?= $(word 3, $(GO_VERSION))
@@ -62,17 +64,30 @@ PROMU        := $(FIRST_GOPATH)/bin/promu
 STATICCHECK  := $(FIRST_GOPATH)/bin/staticcheck
 pkgs          = ./...
 
-GO_VERSION        ?= $(shell $(GO) version)
+ifeq (arm, $(GOHOSTARCH))
-GO_BUILD_PLATFORM ?= $(subst /,-,$(lastword $(GO_VERSION)))
+	GOHOSTARM ?= $(shell GOARM= $(GO) env GOARM)
+	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)v$(GOHOSTARM)
+else
+	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)
+endif
 
 PROMU_VERSION ?= 0.2.0
 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)
 
 PREFIX                  ?= $(shell pwd)
 BIN_DIR                 ?= $(shell pwd)
 DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
 DOCKER_REPO             ?= prom
 
+ifeq ($(GOHOSTARCH),amd64)
+        ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux freebsd darwin windows))
+                # Only supported on amd64
+                test-flags := -race
+        endif
+endif
+
 .PHONY: all
 all: precheck style staticcheck unused build test
 
@@ -110,12 +125,12 @@ common-test-short:
 .PHONY: common-test
 common-test:
 	@echo ">> running all tests"
-	GO111MODULE=$(GO111MODULE) $(GO) test -race $(GOOPTS) $(pkgs)
+	GO111MODULE=$(GO111MODULE) $(GO) test $(test-flags) $(GOOPTS) $(pkgs)
 
 .PHONY: common-format
 common-format:
 	@echo ">> formatting code"
-	GO111MODULE=$(GO111MODULE) $(GO) fmt $(GOOPTS) $(pkgs)
+	GO111MODULE=$(GO111MODULE) $(GO) fmt $(pkgs)
 
 .PHONY: common-vet
 common-vet:
@@ -125,8 +140,12 @@ common-vet:
 .PHONY: common-staticcheck
 common-staticcheck: $(STATICCHECK)
 	@echo ">> running staticcheck"
+	chmod +x $(STATICCHECK)
 ifdef GO111MODULE
-	GO111MODULE=$(GO111MODULE) $(STATICCHECK) -ignore "$(STATICCHECK_IGNORE)" -checks "SA*" $(pkgs)
+# 'go list' needs to be executed before staticcheck to prepopulate the modules cache.
+# Otherwise staticcheck might fail randomly for some reason not yet explained.
+	GO111MODULE=$(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)" $(pkgs)
 endif
@@ -140,8 +159,9 @@ else
 ifdef GO111MODULE
 	@echo ">> running check for unused/missing packages in go.mod"
 	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
+ifeq (,$(wildcard vendor))
 	@git diff --exit-code -- go.sum go.mod
-ifneq (,$(wildcard vendor))
+else
 	@echo ">> running check for unused packages in vendor/"
 	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
 	@git diff --exit-code -- go.sum go.mod vendor/
@@ -175,30 +195,20 @@ common-docker-tag-latest:
 promu: $(PROMU)
 
 $(PROMU):
-	curl -s -L $(PROMU_URL) | tar -xvz -C /tmp
+	$(eval PROMU_TMP := $(shell mktemp -d))
-	mkdir -v -p $(FIRST_GOPATH)/bin
+	curl -s -L $(PROMU_URL) | tar -xvzf - -C $(PROMU_TMP)
-	cp -v /tmp/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM)/promu $(PROMU)
+	mkdir -p $(FIRST_GOPATH)/bin
+	cp $(PROMU_TMP)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM)/promu $(FIRST_GOPATH)/bin/promu
+	rm -r $(PROMU_TMP)
 
 .PHONY: proto
 proto:
 	@echo ">> generating code from proto files"
 	@./scripts/genproto.sh
 
-.PHONY: $(STATICCHECK)
 $(STATICCHECK):
-ifdef GO111MODULE
+	mkdir -p $(FIRST_GOPATH)/bin
-# Get staticcheck from a temporary directory to avoid modifying the local go.{mod,sum}.
+	curl -s -L $(STATICCHECK_URL) > $(STATICCHECK)
-# See https://github.com/golang/go/issues/27643.
-# For now, we are using the next branch of staticcheck because master isn't compatible yet with Go modules.
-	tmpModule=$$(mktemp -d 2>&1) && \
-	mkdir -p $${tmpModule}/staticcheck && \
-	cd "$${tmpModule}"/staticcheck && \
-	GO111MODULE=on $(GO) mod init example.com/staticcheck && \
-	GO111MODULE=on GOOS= GOARCH= $(GO) get -u honnef.co/go/tools/cmd/staticcheck@next && \
-	rm -rf $${tmpModule};
-else
-	GOOS= GOARCH= GO111MODULE=off $(GO) get -u honnef.co/go/tools/cmd/staticcheck
-endif
 
 ifdef GOVENDOR
 .PHONY: $(GOVENDOR)

exporter.go

@@ -487,7 +487,7 @@ func NewExporter(mapper *mapper.MetricMapper) *Exporter {
 		Summaries:   NewSummaryContainer(mapper),
 		Histograms:  NewHistogramContainer(mapper),
 		mapper:      mapper,
-		labelValues: make(map[string]map[uint64]*LabelValues, 0),
+		labelValues: make(map[string]map[uint64]*LabelValues),
 	}
 }
 
@@ -513,9 +513,9 @@ func buildEvent(statType, metric string, value float64, relative bool, labels ma
 			labels:     labels,
 		}, nil
 	case "s":
-		return nil, fmt.Errorf("No support for StatsD sets")
+		return nil, fmt.Errorf("no support for StatsD sets")
 	default:
-		return nil, fmt.Errorf("Bad stat type %s", statType)
+		return nil, fmt.Errorf("bad stat type %s", statType)
 	}
 }
 

exporter_test.go

@@ -40,7 +40,7 @@ func TestNegativeCounter(t *testing.T) {
 		}
 	}()
 
-	events := make(chan Events, 0)
+	events := make(chan Events)
 	go func() {
 		c := Events{
 			&CounterEvent{
@@ -68,7 +68,7 @@ func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
 		}
 	}()
 
-	events := make(chan Events, 0)
+	events := make(chan Events)
 
 	go func() {
 		for _, l := range []statsDPacketHandler{&StatsDUDPListener{}, &mockStatsDTCPListener{}} {
@@ -83,7 +83,7 @@ func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
 
 func TestHistogramUnits(t *testing.T) {
 	// Start exporter with a synchronous channel
-	events := make(chan Events, 0)
+	events := make(chan Events)
 	go func() {
 		ex := NewExporter(&mapper.MetricMapper{})
 		ex.mapper.Defaults.TimerType = mapper.TimerTypeHistogram
@@ -181,7 +181,7 @@ func TestEscapeMetricName(t *testing.T) {
 // bazqux metric should expire with ttl of 2s
 func TestTtlExpiration(t *testing.T) {
 	// Mock a time.NewTicker
-	tickerCh := make(chan time.Time, 0)
+	tickerCh := make(chan time.Time)
 	clock.ClockInstance = &clock.Clock{
 		TickerCh: tickerCh,
 	}
@@ -200,7 +200,7 @@ mappings:
 	if err != nil {
 		t.Fatalf("Config load error: %s %s", config, err)
 	}
-	events := make(chan Events, 0)
+	events := make(chan Events)
 	defer close(events)
 	go func() {
 		ex := NewExporter(testMapper)

main.go

@@ -34,6 +34,7 @@ func init() {
 }
 
 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>

pkg/mapper/fsm/fsm.go

@@ -262,7 +262,7 @@ func TestIfNeedBacktracking(mappings []string, orderingDisabled bool) bool {
 		for i1, r1 := range rules {
 			currentRuleNeedBacktrack := false
 			re1 := rulesRE[i1]
-			if re1 == nil || strings.Index(r1, "*") == -1 {
+			if re1 == nil || !strings.Contains(r1, "*") {
 				continue
 			}
 			// if rule r1 is A.B.C.*.E.*, is there a rule r2 is A.B.C.D.x.x or A.B.C.*.E.F ? (x is any string or *)

pkg/mapper/mapper.go

@@ -54,8 +54,6 @@ type MetricMapper struct {
 	MappingsCount prometheus.Gauge
 }
 
-type matchMetricType string
-
 type MetricMapping struct {
 	Match           string `yaml:"match"`
 	Name            string `yaml:"name"`