Enable more linters (#622)

.github/workflows/lint.yml

@@ -20,9 +20,6 @@ jobs:
   lint:
     name: Lint
     runs-on: ubuntu-22.04
-    permissions:
-      contents: read # for actions/checkout to fetch code
-      pull-requests: read # for golangci/golangci-lint-action to fetch pull requests
     steps:
       - name: Checkout Repository
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
@@ -34,8 +31,6 @@ jobs:
 
       - name: Lint Code
         uses: golangci/golangci-lint-action@3cfe3a4abbb849e10058ce4af15d205b6da42804 # v4.0.0
-        with:
-          only-new-issues: true
 
   actionlint:
     name: Actionlint

.golangci.yml

@@ -31,10 +31,15 @@ linters-settings:
   errcheck:
     exclude-functions:
       - (github.com/go-kit/log.Logger).Log
+  govet:
+    check-shadowing: true
+    enable-all: true
 
 linters:
   enable:
     - asciicheck
+    - bidichk
+    - dupword
     - errcheck
     - errorlint
     - gofmt
@@ -44,18 +49,23 @@ linters:
     - gosimple
     - govet
     - ineffassign
+    - loggercheck
     - makezero
     - misspell
     - nilerr
     - noctx
+    - perfsprint
     - predeclared
     - promlinter
     - revive
     - staticcheck
+    - tagalign
+    - tparallel
     - typecheck
     - unconvert
     - unparam
     - unused
+    - usestdlibvars
     - wastedassign
   disable-all: true
 issues:

.pre-commit-config.yaml

@@ -25,20 +25,10 @@ repos:
       - id: requirements-txt-fixer
       - id: fix-byte-order-marker
 
-  - repo: local
-    hooks:
-      - id: golang-diff
-        name: create-go-diff
-        entry: bash -c 'git diff -p origin/main > /tmp/diff.patch'
-        language: system
-        types: [go]
-        pass_filenames: false
-
   - repo: https://github.com/golangci/golangci-lint
     rev: v1.56.2
     hooks:
-      - id: golangci-lint
-        args: [--new-from-patch=/tmp/diff.patch]
+      - id: golangci-lint-full
 
   - repo: https://github.com/gitleaks/gitleaks
     rev: v8.18.2
@@ -55,4 +45,4 @@ repos:
     hooks:
       - id: yamllint
 ci:
-  skip: [golang-diff, golangci-lint, yamllint]
+  skip: [golangci-lint-full, yamllint]

client/nginx.go

@@ -16,8 +16,8 @@ Reading: %d Writing: %d Waiting: %d
 
 // NginxClient allows you to fetch NGINX metrics from the stub_status page.
 type NginxClient struct {
-	apiEndpoint string
 	httpClient  *http.Client
+	apiEndpoint string
 }
 
 // StubStats represents NGINX stub_status metrics.

collector/helper_test.go

@@ -9,8 +9,10 @@ func TestMergeLabels(t *testing.T) {
 	t.Parallel()
 
 	tests := []struct {
-		name             string
-		mapA, mapB, want map[string]string
+		mapA map[string]string
+		mapB map[string]string
+		want map[string]string
+		name string
 	}{
 		{
 			name: "base case",
@@ -32,7 +34,9 @@ func TestMergeLabels(t *testing.T) {
 		},
 	}
 	for _, tt := range tests {
+		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
 			if got := MergeLabels(tt.mapA, tt.mapB); !reflect.DeepEqual(got, tt.want) {
 				t.Errorf("mergeLabels() = %v, want %v", got, tt.want)
 			}

collector/nginx.go

@@ -11,11 +11,11 @@ import (
 
 // NginxCollector collects NGINX metrics. It implements prometheus.Collector interface.
 type NginxCollector struct {
+	upMetric    prometheus.Gauge
+	logger      log.Logger
 	nginxClient *client.NginxClient
 	metrics     map[string]*prometheus.Desc
-	upMetric    prometheus.Gauge
 	mutex       sync.Mutex
-	logger      log.Logger
 }
 
 // NewNginxCollector creates an NginxCollector.

collector/nginx_plus.go

@@ -33,11 +33,11 @@ type LabelUpdater interface {
 
 // NginxPlusCollector collects NGINX Plus metrics. It implements prometheus.Collector interface.
 type NginxPlusCollector struct {
+	upMetric                       prometheus.Gauge
+	logger                         log.Logger
+	cacheZoneMetrics               map[string]*prometheus.Desc
+	workerMetrics                  map[string]*prometheus.Desc
 	nginxClient                    *plusclient.NginxClient
-	totalMetrics                   map[string]*prometheus.Desc
-	serverZoneMetrics              map[string]*prometheus.Desc
-	upstreamMetrics                map[string]*prometheus.Desc
-	upstreamServerMetrics          map[string]*prometheus.Desc
 	streamServerZoneMetrics        map[string]*prometheus.Desc
 	streamZoneSyncMetrics          map[string]*prometheus.Desc
 	streamUpstreamMetrics          map[string]*prometheus.Desc
@@ -47,21 +47,21 @@ type NginxPlusCollector struct {
 	limitRequestMetrics            map[string]*prometheus.Desc
 	limitConnectionMetrics         map[string]*prometheus.Desc
 	streamLimitConnectionMetrics   map[string]*prometheus.Desc
-	cacheZoneMetrics               map[string]*prometheus.Desc
-	upMetric                       prometheus.Gauge
-	mutex                          sync.Mutex
-	variableLabelNames             VariableLabelNames
+	upstreamServerMetrics          map[string]*prometheus.Desc
+	upstreamMetrics                map[string]*prometheus.Desc
+	streamUpstreamServerPeerLabels map[string][]string
+	serverZoneMetrics              map[string]*prometheus.Desc
 	upstreamServerLabels           map[string][]string
 	streamUpstreamServerLabels     map[string][]string
 	serverZoneLabels               map[string][]string
 	streamServerZoneLabels         map[string][]string
 	upstreamServerPeerLabels       map[string][]string
-	streamUpstreamServerPeerLabels map[string][]string
-	cacheZoneLabels                map[string][]string
-	variableLabelsMutex            sync.RWMutex
-	logger                         log.Logger
 	workerLabels                   map[string][]string
-	workerMetrics                  map[string]*prometheus.Desc
+	cacheZoneLabels                map[string][]string
+	totalMetrics                   map[string]*prometheus.Desc
+	variableLabelNames             VariableLabelNames
+	variableLabelsMutex            sync.RWMutex
+	mutex                          sync.Mutex
 }
 
 // UpdateUpstreamServerPeerLabels updates the Upstream Server Peer Labels

exporter.go

@@ -67,7 +67,7 @@ func parseUnixSocketAddress(address string) (string, string, error) {
 	addressPartsLength := len(addressParts)
 
 	if addressPartsLength > 3 || addressPartsLength < 1 {
-		return "", "", fmt.Errorf("address for unix domain socket has wrong format")
+		return "", "", errors.New("address for unix domain socket has wrong format")
 	}
 
 	unixSocketPath := addressParts[1]
@@ -103,7 +103,7 @@ func main() {
 	// convert deprecated flags to new format
 	for i, arg := range os.Args {
 		if strings.HasPrefix(arg, "-") && !strings.HasPrefix(arg, "--") && len(arg) > 2 {
-			newArg := fmt.Sprintf("-%s", arg)
+			newArg := "-" + arg
 			fmt.Printf("the flag format is deprecated and will be removed in a future release, please use the new format: %s\n", newArg)
 			os.Args[i] = newArg
 		}
@@ -261,8 +261,8 @@ func registerCollector(logger log.Logger, transport *http.Transport,
 }
 
 type userAgentRoundTripper struct {
-	agent string
 	rt    http.RoundTripper
+	agent string
 }
 
 func (rt *userAgentRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {

exporter_test.go

@@ -38,7 +38,9 @@ func TestParsePositiveDuration(t *testing.T) {
 		},
 	}
 	for _, tt := range tests {
+		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
 			got, err := parsePositiveDuration(tt.testInput)
 			if (err != nil) != tt.wantErr {
 				t.Errorf("parsePositiveDuration() error = %v, wantErr %v", err, tt.wantErr)
@@ -91,7 +93,9 @@ func TestParseUnixSocketAddress(t *testing.T) {
 		},
 	}
 	for _, tt := range tests {
+		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
 			socketPath, requestPath, err := parseUnixSocketAddress(tt.testInput)
 			if (err != nil) != tt.wantErr {
 				t.Errorf("parseUnixSocketAddress() error = %v, wantErr %v", err, tt.wantErr)