refact: remove unused struct fields, enable related linter

.golangci.yml

@@ -200,6 +200,29 @@ linters-settings:
       - docStub
       - preferFprint
 
+  unused:
+    # Mark all struct fields that have been written to as used.
+    # Default: true
+    field-writes-are-uses: false
+    # Treat IncDec statement (e.g. `i++` or `i--`) as both read and write operation instead of just write.
+    # Default: false
+    post-statements-are-reads: true
+    # Mark all exported identifiers as used.
+    # Default: true
+    # exported-is-used: false
+    # Mark all exported fields as used.
+    # default: true
+    exported-fields-are-used: false
+    # Mark all function parameters as used.
+    # default: true
+    parameters-are-used: true
+    # Mark all local variables as used.
+    # default: true
+    local-variables-are-used: false
+    # Mark all identifiers inside generated files as used.
+    # Default: true
+    generated-is-used: false
+
 linters:
   enable-all: true
   disable:

pkg/acquisition/acquisition_test.go

@@ -305,11 +305,9 @@ func TestLoadAcquisitionFromFile(t *testing.T) {
 
 type MockCat struct {
 	configuration.DataSourceCommonCfg `yaml:",inline"`
-	logger                            *log.Entry
 }
 
 func (f *MockCat) Configure(cfg []byte, logger *log.Entry, metricsLevel int) error {
-	f.logger = logger
 	if f.Mode == "" {
 		f.Mode = configuration.CAT_MODE
 	}
@@ -350,11 +348,9 @@ func (f *MockCat) GetUuid() string { return "" }
 
 type MockTail struct {
 	configuration.DataSourceCommonCfg `yaml:",inline"`
-	logger                            *log.Entry
 }
 
 func (f *MockTail) Configure(cfg []byte, logger *log.Entry, metricsLevel int) error {
-	f.logger = logger
 	if f.Mode == "" {
 		f.Mode = configuration.TAIL_MODE
 	}

pkg/acquisition/modules/appsec/appsec.go

@@ -49,12 +49,10 @@ type AppsecSourceConfig struct {
 
 // runtime structure of AppsecSourceConfig
 type AppsecSource struct {
-	metricsLevel  int
 	config        AppsecSourceConfig
 	logger        *log.Entry
 	mux           *http.ServeMux
 	server        *http.Server
-	outChan       chan types.Event
 	InChan        chan appsec.ParsedRequest
 	AppsecRuntime *appsec.AppsecRuntimeConfig
 	AppsecConfigs map[string]appsec.AppsecConfig
@@ -162,7 +160,6 @@ func (w *AppsecSource) Configure(yamlConfig []byte, logger *log.Entry, MetricsLe
 	}
 
 	w.logger = logger
-	w.metricsLevel = MetricsLevel
 	w.logger.Tracef("Appsec configuration: %+v", w.config)
 
 	if w.config.AuthCacheDuration == nil {
@@ -266,8 +263,6 @@ func (w *AppsecSource) OneShotAcquisition(_ context.Context, _ chan types.Event,
 }
 
 func (w *AppsecSource) StreamingAcquisition(ctx context.Context, out chan types.Event, t *tomb.Tomb) error {
-	w.outChan = out
-
 	t.Go(func() error {
 		defer trace.CatchPanic("crowdsec/acquis/appsec/live")
 

pkg/apiserver/apic.go

@@ -64,7 +64,6 @@ type apic struct {
 	pullTomb      tomb.Tomb
 	metricsTomb   tomb.Tomb
 	startup       bool
-	credentials   *csconfig.ApiCredentialsCfg
 	scenarioList  []string
 	consoleConfig *csconfig.ConsoleConfig
 	isPulling     chan bool
@@ -186,7 +185,6 @@ func NewAPIC(ctx context.Context, config *csconfig.OnlineApiClientCfg, dbClient
 		dbClient:                  dbClient,
 		mu:                        sync.Mutex{},
 		startup:                   true,
-		credentials:               config.Credentials,
 		pullTomb:                  tomb.Tomb{},
 		pushTomb:                  tomb.Tomb{},
 		metricsTomb:               tomb.Tomb{},

pkg/apiserver/apiserver.go

@@ -35,7 +35,6 @@ type APIServer struct {
 	UnixSocket     string
 	TLS            *csconfig.TLSCfg
 	dbClient       *database.Client
-	logFile        string
 	controller     *controllers.Controller
 	flushScheduler *gocron.Scheduler
 	router         *gin.Engine
@@ -200,7 +199,7 @@ func NewServer(ctx context.Context, config *csconfig.LocalApiServerCfg) (*APISer
 	}
 
 	// The logger that will be used by handlers
-	clog, logFile, err := newGinLogger(config)
+	clog, _, err := newGinLogger(config)
 	if err != nil {
 		return nil, err
 	}
@@ -284,7 +283,6 @@ func NewServer(ctx context.Context, config *csconfig.LocalApiServerCfg) (*APISer
 		URL:            config.ListenURI,
 		UnixSocket:     config.ListenSocket,
 		TLS:            config.TLS,
-		logFile:        logFile,
 		dbClient:       dbClient,
 		controller:     controller,
 		flushScheduler: flushScheduler,

pkg/csplugin/broker.go

@@ -44,11 +44,10 @@
 	profileConfigs                  []*csconfig.ProfileCfg
 	pluginConfigByName              map[string]PluginConfig
 	pluginMap                       map[string]plugin.Plugin
-	notificationConfigsByPluginType map[string][][]byte // "slack" -> []{config1, config2}
 	notificationPluginByName        map[string]protobufs.NotifierServer
 	watcher                         PluginWatcher
 	pluginKillMethods               []func()
 	pluginProcConfig                *csconfig.PluginCfg
 	pluginsTypesToDispatch          map[string]struct{}
 }
 
@@ -74,7 +73,6 @@
 
 func (pb *PluginBroker) Init(ctx context.Context, pluginCfg *csconfig.PluginCfg, profileConfigs []*csconfig.ProfileCfg, configPaths *csconfig.ConfigurationPaths) error {
 	pb.PluginChannel = make(chan ProfileAlert)
-	pb.notificationConfigsByPluginType = make(map[string][][]byte)
 	pb.notificationPluginByName = make(map[string]protobufs.NotifierServer)
 	pb.pluginMap = make(map[string]plugin.Plugin)
 	pb.pluginConfigByName = make(map[string]PluginConfig)

pkg/leakybucket/manager_load.go

@@ -65,7 +65,6 @@ type BucketFactory struct {
 	duration            time.Duration          // internal representation of `Duration`
 	ret                 chan types.Event       // the bucket-specific output chan for overflows
 	processors          []Processor            // processors is the list of hooks for pour/overflow/create (cf. uniq, blackhole etc.)
-	output              bool                   // ??
 	ScenarioVersion     string                 `yaml:"version,omitempty"`
 	hash                string
 	Simulated           bool `yaml:"simulated"` // Set to true if the scenario instantiating the bucket was in the exclusion list
@@ -462,7 +461,6 @@ func LoadBucket(bucketFactory *BucketFactory, tomb *tomb.Tomb) error {
 		}
 	}
 
-	bucketFactory.output = false
 	if err := ValidateFactory(bucketFactory); err != nil {
 		return fmt.Errorf("invalid bucket from %s: %w", bucketFactory.Filename, err)
 	}

pkg/leakybucket/manager_run.go

@@ -33,16 +33,12 @@ func GarbageCollectBuckets(deadline time.Time, buckets *Buckets) error {
 	buckets.wgDumpState.Add(1)
 	defer buckets.wgDumpState.Done()
 
-	total := 0
-	discard := 0
 	toflush := []string{}
 	buckets.Bucket_map.Range(func(rkey, rvalue interface{}) bool {
 		key := rkey.(string)
 		val := rvalue.(*Leaky)
-		total += 1
 		//bucket already overflowed, we can kill it
 		if !val.Ovflw_ts.IsZero() {
-			discard += 1
 			val.logger.Debugf("overflowed at %s.", val.Ovflw_ts)
 			toflush = append(toflush, key)
 			val.tomb.Kill(nil)
@@ -97,12 +93,10 @@ func DumpBucketsStateAt(deadline time.Time, outputdir string, buckets *Buckets)
 	tmpFileName := tmpFd.Name()
 	serialized = make(map[string]Leaky)
 	log.Printf("Dumping buckets state at %s", deadline)
-	total := 0
 	discard := 0
 	buckets.Bucket_map.Range(func(rkey, rvalue interface{}) bool {
 		key := rkey.(string)
 		val := rvalue.(*Leaky)
-		total += 1
 		if !val.Ovflw_ts.IsZero() {
 			discard += 1
 			val.logger.Debugf("overflowed at %s.", val.Ovflw_ts)