Build: use golangci-lint as a make command (#17739)

* Build: use golangci-lint as a make command

* Since gometalinter was deprecated in favor of golangci-lint so it was
  replaced by it. Responsibilities held by the gometalinter was moved to
  golangci-lint

* There was some changes in implementation (that was also mentioned in
  the code comment) between the tools, which uncovered couple errors
  in the code. Those issues were either solved or disabled by
  the inline comments

* Introduce the golangci-lint config, to make their
  configuration more manageable

* Build: replace backend-lint.sh script with make

.circleci/config.yml

@@ -114,7 +114,7 @@ jobs:
           name: check documentation spelling errors
           command: 'codespell -I ./words_to_ignore.txt docs/'
 
-  backend-lint:
+  lint-go:
     docker:
       - image: circleci/golang:1.12.6
         environment:
@@ -124,8 +124,8 @@ jobs:
     steps:
       - checkout
       - run:
-          name: backend lint
-          command: './scripts/backend-lint.sh'
+          name: Lint Go
+          command: 'make lint-go'
 
   test-frontend:
     docker:
@@ -633,7 +633,7 @@ workflows:
           filters: *filter-only-master
       - codespell:
           filters: *filter-only-master
-      - backend-lint:
+      - lint-go:
           filters: *filter-only-master
       - test-frontend:
           filters: *filter-only-master
@@ -649,7 +649,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
             - build-oss-msi
@@ -661,7 +661,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
           filters: *filter-only-master
@@ -671,7 +671,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
             - build-all-enterprise
@@ -682,7 +682,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
           filters: *filter-only-master
@@ -702,7 +702,7 @@ workflows:
           filters: *filter-only-release
       - codespell:
           filters: *filter-only-release
-      - backend-lint:
+      - lint-go:
           filters: *filter-only-release
       - test-frontend:
           filters: *filter-only-release
@@ -718,7 +718,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
             - build-oss-msi
@@ -730,7 +730,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
           filters: *filter-only-release
@@ -741,7 +741,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
           filters: *filter-only-release
@@ -751,7 +751,7 @@ workflows:
             - test-backend
             - test-frontend
             - codespell
-            - backend-lint
+            - lint-go
             - mysql-integration-test
             - postgres-integration-test
           filters: *filter-only-release
@@ -769,7 +769,7 @@ workflows:
               - build-fast-frontend
         - codespell:
             filters: *filter-not-release-or-master
-        - backend-lint:
+        - lint-go:
             filters: *filter-not-release-or-master
         - test-frontend:
             filters: *filter-not-release-or-master
@@ -787,7 +787,7 @@ workflows:
               - test-backend
               - test-frontend
               - codespell
-              - backend-lint
+              - lint-go
               - mysql-integration-test
               - postgres-integration-test
               - cache-server-test
@@ -798,7 +798,7 @@ workflows:
               - test-backend
               - test-frontend
               - codespell
-              - backend-lint
+              - lint-go
               - mysql-integration-test
               - postgres-integration-test
               - cache-server-test

Makefile

@@ -1,6 +1,6 @@
 -include local/Makefile
 
-.PHONY: all deps-go deps-js deps build-go build-server build-cli build-js build build-docker-dev build-docker-full lint-go test-go test-js test run clean gosec revive devenv devenv-down revive-alerting
+.PHONY: all deps-go deps-js deps build-go build-server build-cli build-js build build-docker-dev build-docker-full lint-go gosec revive golangci-lint go-vet test-go test-js test run clean devenv devenv-down revive-alerting
 
 GO := GO111MODULE=on go
 GO_FILES := ./pkg/...
@@ -43,10 +43,6 @@ build-docker-full:
 	@echo "build docker container"
 	docker build --tag grafana/grafana:dev .
 
-lint-go:
-	@echo "lint go source"
-	scripts/backend-lint.sh
-
 test-go:
 	@echo "test backend"
 	GO111MODULE=on go test -v ./pkg/...
@@ -78,27 +74,46 @@ scripts/go/bin/bra: scripts/go/go.mod
 	@cd scripts/go; \
 	$(GO) build -o ./bin/bra github.com/Unknwon/bra
 
+scripts/go/bin/golangci-lint: scripts/go/go.mod
+	@cd scripts/go; \
+	$(GO) build -o ./bin/golangci-lint github.com/golangci/golangci-lint/cmd/golangci-lint
+
 revive: scripts/go/bin/revive
+	@echo "lint via revive"
 	@scripts/go/bin/revive \
 		-formatter stylish \
 		-config ./scripts/go/configs/revive.toml \
 		$(GO_FILES)
 
 revive-alerting: scripts/go/bin/revive
+	@echo "lint alerting via revive"
 	@scripts/go/bin/revive \
 		-formatter stylish \
 		./pkg/services/alerting/...
 
-run: scripts/go/bin/bra
-	@scripts/go/bin/bra run
-
 # TODO recheck the rules and leave only necessary exclusions
 gosec: scripts/go/bin/gosec
+	@echo "lint via gosec"
 	@scripts/go/bin/gosec -quiet \
 		-exclude=G104,G107,G201,G202,G204,G301,G304,G401,G402,G501 \
 		-conf=./scripts/go/configs/gosec.json \
 		$(GO_FILES)
 
+golangci-lint: scripts/go/bin/golangci-lint
+	@echo "lint via golangci-lint"
+	@scripts/go/bin/golangci-lint run \
+		--config ./scripts/go/configs/.golangci.yml \
+		$(GO_FILES)
+
+go-vet:
+	@echo "lint via go vet"
+	@go vet $(GO_FILES)
+
+lint-go: go-vet golangci-lint revive revive-alerting gosec
+
+run: scripts/go/bin/bra
+	@scripts/go/bin/bra run
+
 # create docker-compose file with provided sources and start them
 # example: make devenv sources=postgres,openldap
 ifeq ($(sources),)

pkg/STYLEGUIDE.md

@@ -5,7 +5,10 @@ Grafanas backend has been developed for a long time with a mix of code styles.
 This style guide is a guide for how we want to write Go code in the future. Generally, we want to follow the style guides used in Go [Code Review Comments](https://code.google.com/p/go-wiki/wiki/CodeReviewComments) and Peter Bourgon's [Go: Best Practices for Production Environments](http://peter.bourgon.org/go-in-production/#formatting-and-style)
 
 ## Linting and formatting
-We enforce strict `gofmt` formating and use some linters on our codebase. You can find the current list of linters at https://github.com/grafana/grafana/blob/master/scripts/backend-lint.sh
+We enforce strict `gofmt` formating and use some linters on our codebase. You can lint the codebase with <akefile -
+```bash
+$ make lint-go
+```
 
 We use [revive](https://github.com/mgechev/revive) as a go linter, and do enforce our [custom config](https://github.com/grafana/grafana/blob/master/conf/revive.toml) for it.
 

pkg/api/pluginproxy/ds_proxy_test.go

@@ -65,7 +65,7 @@ func TestDSRouteRule(t *testing.T) {
 				},
 			}
 
-			setting.SecretKey = "password"
+			setting.SecretKey = "password" //nolint:goconst
 			key, _ := util.Encrypt([]byte("123"), "password")
 
 			ds := &m.DataSource{

pkg/components/dynmap/dynmap_test.go

@@ -28,6 +28,8 @@ func (assert *Assert) True(value bool, message string) {
 
 func TestFirst(t *testing.T) {
 
+	anton := "anton"
+	street42 := "Street 42"
 	assert := NewAssert(t)
 
 	testJSON := `{
@@ -68,19 +70,19 @@ func TestFirst(t *testing.T) {
 	assert.True(err == nil, "failed to create json from string")
 
 	s, err := j.GetString("name")
-	assert.True(s == "anton" && err == nil, "name should be a string")
+	assert.True(s == anton && err == nil, "name should be a string")
 
 	s = j.MustGetString("name", "fallback")
-	assert.True(s == "anton", "must get string")
+	assert.True(s == anton, "must get string")
 
 	s = j.MustGetString("adsasdas", "fallback")
 	assert.True(s == "fallback", "must get string return fallback")
 
 	s, err = j.GetString("name")
-	assert.True(s == "anton" && err == nil, "name should match")
+	assert.True(s == anton && err == nil, "name should match")
 
 	s, err = j.GetString("address", "street")
-	assert.True(s == "Street 42" && err == nil, "street should match")
+	assert.True(s == street42 && err == nil, "street should match")
 	//log.Println("s: ", s.String())
 
 	_, err = j.GetNumber("age")
@@ -109,13 +111,13 @@ func TestFirst(t *testing.T) {
 	//log.Println("address: ", address)
 
 	s, err = address.GetString("street")
-	assert.True(s == "Street 42" && err == nil, "street mismatching")
+	assert.True(s == street42 && err == nil, "street mismatching")
 
 	addressAsString, err := j.GetString("address")
 	assert.True(addressAsString == "" && err != nil, "address should not be an string")
 
 	s, err = j.GetString("address", "street")
-	assert.True(s == "Street 42" && err == nil, "street mismatching")
+	assert.True(s == street42 && err == nil, "street mismatching")
 
 	s, err = j.GetString("address", "name2")
 	assert.True(s == "" && err != nil, "nonexistent string fail")
@@ -153,7 +155,7 @@ func TestFirst(t *testing.T) {
 		assert.True(err == nil, "create element fail")
 
 		s, err = element.GetString("street")
-		assert.True(s == "Street 42" && err == nil, "second fail")
+		assert.True(s == street42 && err == nil, "second fail")
 	}
 
 	obj, err := j.GetObject("country")

pkg/login/social/social.go

@@ -90,7 +90,8 @@ func NewOAuthService() {
 
 		// handle the clients that do not properly support Basic auth headers and require passing client_id/client_secret via POST payload
 		if info.SendClientCredentialsViaPost {
-			oauth2.RegisterBrokenAuthHeaderProvider(info.TokenUrl)
+			// TODO: Fix the staticcheck error
+			oauth2.RegisterBrokenAuthHeaderProvider(info.TokenUrl) //nolint:staticcheck
 		}
 
 		if name == "grafananet" {

pkg/middleware/middleware_test.go

@@ -10,6 +10,9 @@ import (
 	"testing"
 	"time"
 
+	. "github.com/smartystreets/goconvey/convey"
+	"gopkg.in/macaron.v1"
+
 	"github.com/grafana/grafana/pkg/api/dtos"
 	"github.com/grafana/grafana/pkg/bus"
 	"github.com/grafana/grafana/pkg/infra/remotecache"
@@ -18,11 +21,11 @@ import (
 	"github.com/grafana/grafana/pkg/services/login"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/grafana/grafana/pkg/util"
-	. "github.com/smartystreets/goconvey/convey"
 	"github.com/stretchr/testify/assert"
-	"gopkg.in/macaron.v1"
 )
 
+const errorTemplate = "error-template"
+
 func mockGetTime() {
 	var timeSeed int64
 	getTime = func() time.Time {
@@ -37,7 +40,7 @@ func resetGetTime() {
 }
 
 func TestMiddleWareSecurityHeaders(t *testing.T) {
-	setting.ERR_TEMPLATE_NAME = "error-template"
+	setting.ERR_TEMPLATE_NAME = errorTemplate
 
 	Convey("Given the grafana middleware", t, func() {
 
@@ -70,7 +73,7 @@ func TestMiddleWareSecurityHeaders(t *testing.T) {
 }
 
 func TestMiddlewareContext(t *testing.T) {
-	setting.ERR_TEMPLATE_NAME = "error-template"
+	setting.ERR_TEMPLATE_NAME = errorTemplate
 
 	Convey("Given the grafana middleware", t, func() {
 		middlewareScenario(t, "middleware should add context to injector", func(sc *scenarioContext) {

pkg/models/datasource_cache_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/grafana/grafana/pkg/util"
 )
 
+//nolint:goconst
 func TestDataSourceCache(t *testing.T) {
 	Convey("When caching a datasource proxy", t, func() {
 		clearCache()

pkg/services/alerting/notifiers/alertmanager_test.go

@@ -77,6 +77,7 @@ func TestWhenAlertManagerShouldNotify(t *testing.T) {
 	}
 }
 
+//nolint:goconst
 func TestAlertmanagerNotifier(t *testing.T) {
 	Convey("Alertmanager notifier tests", t, func() {
 

pkg/services/alerting/notifiers/discord.go

@@ -158,7 +158,6 @@ func (dn *DiscordNotifier) Notify(evalContext *alerting.EvalContext) error {
 
 func (dn *DiscordNotifier) embedImage(cmd *models.SendWebhookSync, imagePath string, existingJSONBody []byte) error {
 	f, err := os.Open(imagePath)
-	defer f.Close()
 	if err != nil {
 		if os.IsNotExist(err) {
 			cmd.Body = string(existingJSONBody)
@@ -169,6 +168,8 @@ func (dn *DiscordNotifier) embedImage(cmd *models.SendWebhookSync, imagePath str
 		}
 	}
 
+	defer f.Close()
+
 	var b bytes.Buffer
 	w := multipart.NewWriter(&b)
 

pkg/services/alerting/notifiers/hipchat_test.go

@@ -8,6 +8,7 @@ import (
 	. "github.com/smartystreets/goconvey/convey"
 )
 
+//nolint:goconst
 func TestHipChatNotifier(t *testing.T) {
 	Convey("HipChat notifier tests", t, func() {
 
@@ -29,9 +30,8 @@ func TestHipChatNotifier(t *testing.T) {
 			Convey("from settings", func() {
 				json := `
 				{
-          "url": "http://google.com"
+          			"url": "http://google.com"
 				}`
-
 				settingsJSON, _ := simplejson.NewJson([]byte(json))
 				model := &models.AlertNotification{
 					Name:     "ops",

pkg/services/alerting/notifiers/slack_test.go

@@ -26,6 +26,7 @@ func TestSlackNotifier(t *testing.T) {
 				So(err, ShouldNotBeNil)
 			})
 
+			//nolint:goconst
 			Convey("from settings", func() {
 				json := `
 				{

pkg/services/provisioning/dashboards/file_reader.go

@@ -53,7 +53,9 @@ func NewDashboardFileReader(cfg *DashboardsAsConfig, log log.Logger) (*fileReade
 
 // pollChanges periodically runs startWalkingDisk based on interval specified in the config.
 func (fr *fileReader) pollChanges(ctx context.Context) {
-	ticker := time.Tick(time.Duration(int64(time.Second) * fr.Cfg.UpdateIntervalSeconds))
+
+	// TODO: Fix the staticcheck error
+	ticker := time.Tick(time.Duration(int64(time.Second) * fr.Cfg.UpdateIntervalSeconds)) //nolint:staticcheck
 	for {
 		select {
 		case <-ticker:

pkg/services/sqlstore/user_auth_test.go

@@ -12,6 +12,7 @@ import (
 	m "github.com/grafana/grafana/pkg/models"
 )
 
+//nolint:goconst
 func TestUserAuth(t *testing.T) {
 	InitTestDB(t)
 

pkg/tsdb/elasticsearch/client/client_test.go

@@ -17,6 +17,7 @@ import (
 	. "github.com/smartystreets/goconvey/convey"
 )
 
+//nolint:goconst
 func TestClient(t *testing.T) {
 	Convey("Test elasticsearch client", t, func() {
 		Convey("NewClient", func() {

scripts/backend-lint.sh

@@ -1,43 +0,0 @@
-#!/bin/bash
-
-function exit_if_fail {
-  command=$@
-  echo "Executing '$command'"
-  eval $command
-  rc=$?
-  if [ $rc -ne 0 ]; then
-      echo "'$command' returned $rc."
-      exit $rc
-  fi
-}
-
-go get -u github.com/alecthomas/gometalinter
-go get -u github.com/jgautheron/goconst/cmd/goconst
-go get -u honnef.co/go/tools/cmd/staticcheck
-go get -u github.com/golangci/golangci-lint/cmd/golangci-lint
-
-# use gometalinter when lints are not available in golangci or
-# when gometalinter is better. Eg. goconst for gometalinter does not lint test files
-# which is not desired.
-exit_if_fail gometalinter --enable-gc --vendor --deadline 10m --disable-all \
-  --enable=goconst\
-  --enable=staticcheck
-
-# use golangci-when possible
-exit_if_fail golangci-lint run --deadline 10m --disable-all \
-  --enable=deadcode\
-  --enable=gofmt\
-  --enable=gosimple\
-  --enable=govet\
-  --enable=ineffassign\
-  --enable=structcheck\
-  --enable=typecheck\
-  --enable=unconvert\
-  --enable=unused\
-  --enable=varcheck
-
-exit_if_fail go vet ./pkg/...
-
-exit_if_fail make revive
-exit_if_fail make revive-alerting
-exit_if_fail make gosec

scripts/go/configs/.golangci.yml

@@ -0,0 +1,25 @@
+enable:
+
+run: 
+   deadline: 10m
+
+linters:
+  disable-all: true
+  enable:
+    - deadcode
+    - gofmt
+    - gosimple
+    - govet
+    - ineffassign
+    - structcheck
+    - typecheck
+    - unconvert
+    - unused
+    - varcheck 
+    - goconst 
+    - staticcheck 
+
+linter-settings:
+  goconst:
+    ignore-tests: true
+  

scripts/go/go.mod

@@ -6,8 +6,13 @@ require (
 	github.com/Unknwon/bra v0.0.0-20181014071252-e3d443382332
 	github.com/Unknwon/com v0.0.0-20190321035513-0fed4efef755 // indirect
 	github.com/Unknwon/log v0.0.0-20150304194804-e617c87089d3 // indirect
+	github.com/alecthomas/gometalinter v3.0.0+incompatible
+	github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf // indirect
+	github.com/golangci/golangci-lint v1.17.1 // indirect
+	github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf // indirect
 	github.com/mgechev/revive v0.0.0-20190505013521-22b849f28677
 	github.com/securego/gosec v0.0.0-20190510081509-ee80733faf72
 	github.com/urfave/cli v1.20.0 // indirect
+	gopkg.in/alecthomas/kingpin.v3-unstable v3.0.0-20180810215634-df19058c872c // indirect
 	gopkg.in/fsnotify/fsnotify.v1 v1.4.7 // indirect
 )

scripts/go/go.sum

@@ -1,95 +1,268 @@
 github.com/BurntSushi/toml v0.3.0 h1:e1/Ivsx3Z0FVTV0NSOv/aVgbUWyQuzj7DDnFblkRvsY=
 github.com/BurntSushi/toml v0.3.0/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/OpenPeeDeeP/depguard v0.0.0-20180806142446-a69c782687b2 h1:HTOmFEEYrWi4MW5ZKUx6xfeyM10Sx3kQF65xiQJMPYA=
+github.com/OpenPeeDeeP/depguard v0.0.0-20180806142446-a69c782687b2/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o=
+github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/Unknwon/bra v0.0.0-20181014071252-e3d443382332 h1:D21WfIWwe168rsLl22GW9Ru1N2T0g1N+9Qkp6miIWi0=
 github.com/Unknwon/bra v0.0.0-20181014071252-e3d443382332/go.mod h1:MRqUpwJsdIknVYrE0UEVrvjeekPDjGu8Nz5urz/JNOA=
 github.com/Unknwon/com v0.0.0-20190321035513-0fed4efef755 h1:1B7wb36fHLSwZfHg6ngZhhtIEHQjiC5H4p7qQGBEffg=
 github.com/Unknwon/com v0.0.0-20190321035513-0fed4efef755/go.mod h1:voKvFVpXBJxdIPeqjoJuLK+UVcRlo/JLjeToGxPYu68=
 github.com/Unknwon/log v0.0.0-20150304194804-e617c87089d3 h1:nHkiZPlwtgiyCCPzY5X629N8V/ZBhyTlDgmXYLnrYUs=
 github.com/Unknwon/log v0.0.0-20150304194804-e617c87089d3/go.mod h1:/+ZenhmdkCX8gc8YHVQRSdVGE/+F9HvTY6QDTwEbaO4=
+github.com/alecthomas/gometalinter v3.0.0+incompatible h1:e9Zfvfytsw/e6Kd/PYd75wggK+/kX5Xn8IYDUKyc5fU=
+github.com/alecthomas/gometalinter v3.0.0+incompatible/go.mod h1:qfIpQGGz3d+NmgyPBqv+LSh50emm1pt72EtcX2vKYQk=
+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/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/fatih/color v1.6.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
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+sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

scripts/go/tools.go

@@ -6,4 +6,5 @@ import (
 	_ "github.com/Unknwon/bra"
 	_ "github.com/mgechev/revive"
 	_ "github.com/securego/gosec"
+	_ "github.com/golangci/golangci-lint/cmd/golangci-lint"
 )