feat: Simplify linter configuration and fix related issues

.github/workflows/ci.yaml

@@ -7,11 +7,14 @@
      name: lint
      runs-on: ubuntu-latest
      steps:
-       - uses: actions/checkout@v4
-       - name: golangci-lint
-         uses: golangci/golangci-lint-action@v4
-         with:
-           version: latest
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.20'
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.58
    test:
      name: test
      runs-on: ubuntu-latest

.golangci.yml

@@ -1,3 +1,8 @@
 ---
 linters:
-  disable-all: true
+  enable:
+    - gofmt   
+    - govet  
+    - revive 
+    - staticcheck 
+    - errcheck

internal/cmd/main.go

@@ -6,14 +6,14 @@ import (
 	"syscall"
 
 	"github.com/snapp-incubator/nats-blackbox-exporter/internal/config"
-	"github.com/snapp-incubator/nats-blackbox-exporter/internal/natsClient"
+	"github.com/snapp-incubator/nats-blackbox-exporter/internal/natsclient"
 	"go.uber.org/zap"
 )
 
 func main(cfg config.Config, logger *zap.Logger) {
 	natsConfig := cfg.NATS
 
-	client := natsClient.New(natsClient.Connect(logger, natsConfig), logger, natsConfig)
+	client := natsclient.New(natsclient.Connect(logger, natsConfig), logger, natsConfig)
 
 	client.StartMessaging()
 

internal/config/config.go

@@ -11,7 +11,7 @@ import (
 	"github.com/knadh/koanf/providers/structs"
 	"github.com/knadh/koanf/v2"
 	"github.com/snapp-incubator/nats-blackbox-exporter/internal/logger"
-	"github.com/snapp-incubator/nats-blackbox-exporter/internal/natsClient"
+	"github.com/snapp-incubator/nats-blackbox-exporter/internal/natsclient"
 	"github.com/tidwall/pretty"
 )
 
@@ -24,7 +24,7 @@ type (
 	// Config holds all configurations.
 	Config struct {
 		Logger logger.Config     `json:"logger,omitempty" koanf:"logger"`
-		NATS   natsClient.Config `json:"nats,omitempty" koanf:"nats"`
+		NATS   natsclient.Config `json:"nats,omitempty" koanf:"nats"`
 	}
 )
 

internal/config/default.go

@@ -4,7 +4,7 @@ import (
 	"time"
 
 	"github.com/snapp-incubator/nats-blackbox-exporter/internal/logger"
-	"github.com/snapp-incubator/nats-blackbox-exporter/internal/natsClient"
+	"github.com/snapp-incubator/nats-blackbox-exporter/internal/natsclient"
 )
 
 // Default return default configuration.
@@ -14,7 +14,7 @@ func Default() Config {
 		Logger: logger.Config{
 			Level: "debug",
 		},
-		NATS: natsClient.Config{
+		NATS: natsclient.Config{
 			URL:             "localhost:4222",
 			PublishInterval: 2 * time.Second,
 			RequestTimeout:  50 * time.Millisecond,

internal/natsClient/client.go

@@ -1,4 +1,4 @@
-package natsClient
+package natsclient
 
 import (
 	"time"

internal/natsClient/config.go

@@ -1,4 +1,4 @@
-package natsClient
+package natsclient
 
 import "time"