[#195] Add tags support

Signed-off-by: Aleksey Kravchenko <al.kravchenko@yadro.com>

cmd/http-gw/app.go

@@ -44,6 +44,7 @@ import (
 	"github.com/valyala/fasthttp"
 	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 	"golang.org/x/exp/slices"
 )
 
@@ -51,7 +52,6 @@ type (
 	app struct {
 		ctx            context.Context
 		log            *zap.Logger
-		logLevel       zap.AtomicLevel
 		pool           *pool.Pool
 		treePool       *treepool.Pool
 		key            *keys.PrivateKey
@@ -96,6 +96,7 @@ type (
 		workerPoolSize    int
 
 		mu                     sync.RWMutex
+		tagsConfig             *tagsConfig
 		defaultTimestamp       bool
 		zipCompression         bool
 		clientCut              bool
@@ -113,6 +114,10 @@ type (
 		enableFilepathFallback bool
 	}
 
+	tagsConfig struct {
+		tagLogs sync.Map
+	}
+
 	CORS struct {
 		AllowOrigin      string
 		AllowMethods     []string
@@ -123,9 +128,56 @@ type (
 	}
 )
 
+func newTagsConfig(v *viper.Viper) *tagsConfig {
+	var t tagsConfig
+	if err := t.update(v); err != nil {
+		// panic here is analogue of the similar panic during common log level initialization.
+		panic(err.Error())
+	}
+	return &t
+}
+
+func (t *tagsConfig) LevelEnabled(tag string, tgtLevel zapcore.Level) bool {
+	lvl, ok := t.tagLogs.Load(tag)
+	if !ok {
+		return false
+	}
+
+	return lvl.(zapcore.Level).Enabled(tgtLevel)
+}
+
+func (t *tagsConfig) update(cfg *viper.Viper) error {
+	tags, err := fetchLogTagsConfig(cfg)
+	if err != nil {
+		return err
+	}
+
+	t.tagLogs.Range(func(key, value any) bool {
+		k := key.(string)
+		v := value.(zapcore.Level)
+
+		if lvl, ok := tags[k]; ok {
+			if lvl != v {
+				t.tagLogs.Store(key, lvl)
+			}
+		} else {
+			t.tagLogs.Delete(key)
+			delete(tags, k)
+		}
+		return true
+	})
+
+	for k, v := range tags {
+		t.tagLogs.Store(k, v)
+	}
+
+	return nil
+}
+
 func newApp(ctx context.Context, v *viper.Viper) App {
 	logSettings := &loggerSettings{}
-	log := pickLogger(v, logSettings)
+	tagConfig := newTagsConfig(v)
+	log := pickLogger(v, logSettings, tagConfig)
 
 	a := &app{
 		ctx:            ctx,
@@ -137,7 +189,7 @@ func newApp(ctx context.Context, v *viper.Viper) App {
 		bucketCache:    cache.NewBucketCache(getBucketCacheOptions(v, log.logger), v.GetBool(cfgFeaturesTreePoolNetmapSupport)),
 	}
 
-	a.initAppSettings()
+	a.initAppSettings(tagConfig)
 
 	// -- setup FastHTTP server --
 	a.webServer.Name = "frost-http-gw"
@@ -167,11 +219,12 @@ func newApp(ctx context.Context, v *viper.Viper) App {
 	return a
 }
 
-func (a *app) initAppSettings() {
+func (a *app) initAppSettings(tc *tagsConfig) {
 	a.settings = &appSettings{
 		reconnectInterval: fetchReconnectInterval(a.cfg),
 		dialerSource:      getDialerSource(a.log, a.cfg),
 		workerPoolSize:    a.cfg.GetInt(cfgWorkerPoolSize),
+		tagsConfig:        tc,
 	}
 	a.settings.update(a.cfg, a.log)
 }
@@ -319,7 +372,7 @@ func (a *app) initResolver() {
 	var err error
 	a.resolver, err = resolver.NewContainerResolver(a.getResolverConfig())
 	if err != nil {
-		a.log.Fatal(logs.FailedToCreateResolver, zap.Error(err))
+		a.log.Fatal(logs.FailedToCreateResolver, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 }
 
@@ -333,11 +386,12 @@ func (a *app) getResolverConfig() ([]string, *resolver.Config) {
 	order := a.cfg.GetStringSlice(cfgResolveOrder)
 	if resolveCfg.RPCAddress == "" {
 		order = remove(order, resolver.NNSResolver)
-		a.log.Warn(logs.ResolverNNSWontBeUsedSinceRPCEndpointIsntProvided)
+		a.log.Warn(logs.ResolverNNSWontBeUsedSinceRPCEndpointIsntProvided, logs.TagField(logs.TagConfig))
 	}
 
 	if len(order) == 0 {
-		a.log.Info(logs.ContainerResolverWillBeDisabledBecauseOfResolversResolverOrderIsEmpty)
+		a.log.Info(logs.ContainerResolverWillBeDisabledBecauseOfResolversResolverOrderIsEmpty,
+			logs.TagField(logs.TagConfig))
 	}
 
 	return order, resolveCfg
@@ -352,7 +406,7 @@ func (a *app) initMetrics() {
 
 func newGateMetrics(logger *zap.Logger, provider *metrics.GateMetrics, enabled bool) *gateMetrics {
 	if !enabled {
-		logger.Warn(logs.MetricsAreDisabled)
+		logger.Warn(logs.MetricsAreDisabled, logs.TagField(logs.TagConfig))
 	}
 	return &gateMetrics{
 		logger:   logger,
@@ -370,7 +424,7 @@ func (m *gateMetrics) isEnabled() bool {
 
 func (m *gateMetrics) SetEnabled(enabled bool) {
 	if !enabled {
-		m.logger.Warn(logs.MetricsAreDisabled)
+		m.logger.Warn(logs.MetricsAreDisabled, logs.TagField(logs.TagConfig))
 	}
 
 	m.mu.Lock()
@@ -433,7 +487,7 @@ func getFrostFSKey(cfg *viper.Viper, log *zap.Logger) (*keys.PrivateKey, error)
 	walletPath := cfg.GetString(cfgWalletPath)
 
 	if len(walletPath) == 0 {
-		log.Info(logs.NoWalletPathSpecifiedCreatingEphemeralKeyAutomaticallyForThisRun)
+		log.Info(logs.NoWalletPathSpecifiedCreatingEphemeralKeyAutomaticallyForThisRun, logs.TagField(logs.TagConfig))
 		key, err := keys.NewPrivateKey()
 		if err != nil {
 			return nil, err
@@ -490,7 +544,10 @@ func getKeyFromWallet(w *wallet.Wallet, addrStr string, password *string) (*keys
 }
 
 func (a *app) Wait() {
-	a.log.Info(logs.StartingApplication, zap.String("app_name", "frostfs-http-gw"), zap.String("version", Version))
+	a.log.Info(logs.StartingApplication,
+		zap.String("app_name", "frostfs-http-gw"),
+		zap.String("version", Version),
+		logs.TagField(logs.TagApp))
 
 	a.metrics.SetVersion(Version)
 	a.setHealthStatus()
@@ -521,10 +578,10 @@ func (a *app) Serve() {
 
 	for i := range servs {
 		go func(i int) {
-			a.log.Info(logs.StartingServer, zap.String("address", servs[i].Address()))
+			a.log.Info(logs.StartingServer, zap.String("address", servs[i].Address()), logs.TagField(logs.TagApp))
 			if err := a.webServer.Serve(servs[i].Listener()); err != nil && err != http.ErrServerClosed {
 				a.metrics.MarkUnhealthy(servs[i].Address())
-				a.log.Fatal(logs.ListenAndServe, zap.Error(err))
+				a.log.Fatal(logs.ListenAndServe, zap.Error(err), logs.TagField(logs.TagApp))
 			}
 		}(i)
 	}
@@ -546,7 +603,7 @@ LOOP:
 		}
 	}
 
-	a.log.Info(logs.ShuttingDownWebServer, zap.Error(a.webServer.Shutdown()))
+	a.log.Info(logs.ShuttingDownWebServer, zap.Error(a.webServer.Shutdown()), logs.TagField(logs.TagApp))
 
 	a.metrics.Shutdown()
 	a.stopServices()
@@ -556,7 +613,7 @@ LOOP:
 func (a *app) initWorkerPool() *ants.Pool {
 	workerPool, err := ants.NewPool(a.settings.workerPoolSize)
 	if err != nil {
-		a.log.Fatal(logs.FailedToCreateWorkerPool, zap.Error(err))
+		a.log.Fatal(logs.FailedToCreateWorkerPool, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 	return workerPool
 }
@@ -567,37 +624,37 @@ func (a *app) shutdownTracing() {
 	defer cancel()
 
 	if err := tracing.Shutdown(shdnCtx); err != nil {
-		a.log.Warn(logs.FailedToShutdownTracing, zap.Error(err))
+		a.log.Warn(logs.FailedToShutdownTracing, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 }
 
 func (a *app) configReload(ctx context.Context) {
-	a.log.Info(logs.SIGHUPConfigReloadStarted)
+	log := a.log.With(logs.TagField(logs.TagConfig))
+
+	log.Info(logs.SIGHUPConfigReloadStarted)
 	if !a.cfg.IsSet(cmdConfig) && !a.cfg.IsSet(cmdConfigDir) {
-		a.log.Warn(logs.FailedToReloadConfigBecauseItsMissed)
+		log.Warn(logs.FailedToReloadConfigBecauseItsMissed)
 		return
 	}
 	if err := readInConfig(a.cfg); err != nil {
-		a.log.Warn(logs.FailedToReloadConfig, zap.Error(err))
+		log.Warn(logs.FailedToReloadConfig, zap.Error(err))
 		return
 	}
 
-	if lvl, err := getLogLevel(a.cfg); err != nil {
-		a.log.Warn(logs.LogLevelWontBeUpdated, zap.Error(err))
-	} else {
-		a.logLevel.SetLevel(lvl)
+	if err := a.settings.tagsConfig.update(a.cfg); err != nil {
+		log.Warn(logs.TagsLogConfigWontBeUpdated, zap.Error(err))
 	}
 
 	if err := a.settings.dialerSource.Update(fetchMultinetConfig(a.cfg, a.log)); err != nil {
-		a.log.Warn(logs.MultinetConfigWontBeUpdated, zap.Error(err))
+		log.Warn(logs.MultinetConfigWontBeUpdated, zap.Error(err))
 	}
 
 	if err := a.resolver.UpdateResolvers(a.getResolverConfig()); err != nil {
-		a.log.Warn(logs.FailedToUpdateResolvers, zap.Error(err))
+		log.Warn(logs.FailedToUpdateResolvers, zap.Error(err))
 	}
 
 	if err := a.updateServers(); err != nil {
-		a.log.Warn(logs.FailedToReloadServerParameters, zap.Error(err))
+		log.Warn(logs.FailedToReloadServerParameters, zap.Error(err))
 	}
 
 	a.setRuntimeParameters()
@@ -611,7 +668,7 @@ func (a *app) configReload(ctx context.Context) {
 	a.initTracing(ctx)
 	a.setHealthStatus()
 
-	a.log.Info(logs.SIGHUPConfigReloadCompleted)
+	log.Info(logs.SIGHUPConfigReloadCompleted)
 }
 
 func (a *app) startServices() {
@@ -647,18 +704,18 @@ func (a *app) configureRouter(h *handler.Handler) {
 
 	r.POST("/upload/{cid}", a.addMiddlewares(h.Upload))
 	r.OPTIONS("/upload/{cid}", a.addPreflight())
-	a.log.Info(logs.AddedPathUploadCid)
+	a.log.Info(logs.AddedPathUploadCid, logs.TagField(logs.TagApp))
 	r.GET("/get/{cid}/{oid:*}", a.addMiddlewares(h.DownloadByAddressOrBucketName))
 	r.HEAD("/get/{cid}/{oid:*}", a.addMiddlewares(h.HeadByAddressOrBucketName))
 	r.OPTIONS("/get/{cid}/{oid:*}", a.addPreflight())
-	a.log.Info(logs.AddedPathGetCidOid)
+	a.log.Info(logs.AddedPathGetCidOid, logs.TagField(logs.TagApp))
 	r.GET("/get_by_attribute/{cid}/{attr_key}/{attr_val:*}", a.addMiddlewares(h.DownloadByAttribute))
 	r.HEAD("/get_by_attribute/{cid}/{attr_key}/{attr_val:*}", a.addMiddlewares(h.HeadByAttribute))
 	r.OPTIONS("/get_by_attribute/{cid}/{attr_key}/{attr_val:*}", a.addPreflight())
-	a.log.Info(logs.AddedPathGetByAttributeCidAttrKeyAttrVal)
+	a.log.Info(logs.AddedPathGetByAttributeCidAttrKeyAttrVal, logs.TagField(logs.TagApp))
 	r.GET("/zip/{cid}/{prefix:*}", a.addMiddlewares(h.DownloadZipped))
 	r.OPTIONS("/zip/{cid}/{prefix:*}", a.addPreflight())
-	a.log.Info(logs.AddedPathZipCidPrefix)
+	a.log.Info(logs.AddedPathZipCidPrefix, logs.TagField(logs.TagApp))
 
 	a.webServer.Handler = r.Handler
 }
@@ -752,6 +809,7 @@ func (a *app) logger(h fasthttp.RequestHandler) fasthttp.RequestHandler {
 			zap.ByteString("method", req.Method()),
 			zap.ByteString("path", req.Path()),
 			zap.ByteString("query", req.QueryArgs().QueryString()),
+			logs.TagField(logs.TagDatapath),
 		}
 
 		log.Info(logs.Request, fields...)
@@ -798,7 +856,7 @@ func (a *app) tokenizer(h fasthttp.RequestHandler) fasthttp.RequestHandler {
 		if err != nil {
 			log := utils.GetReqLogOrDefault(reqCtx, a.log)
 
-			log.Error(logs.CouldNotFetchAndStoreBearerToken, zap.Error(err))
+			log.Error(logs.CouldNotFetchAndStoreBearerToken, zap.Error(err), logs.TagField(logs.TagDatapath))
 			handler.ResponseError(req, "could not fetch and store bearer token: "+err.Error(), fasthttp.StatusBadRequest)
 			return
 		}
@@ -852,6 +910,7 @@ func (a *app) initServers(ctx context.Context) {
 		fields := []zap.Field{
 			zap.String("address", serverInfo.Address), zap.Bool("tls enabled", serverInfo.TLS.Enabled),
 			zap.String("tls cert", serverInfo.TLS.CertFile), zap.String("tls key", serverInfo.TLS.KeyFile),
+			logs.TagField(logs.TagApp),
 		}
 		srv, err := newServer(ctx, serverInfo)
 		if err != nil {
@@ -867,7 +926,7 @@ func (a *app) initServers(ctx context.Context) {
 	}
 
 	if len(a.servers) == 0 {
-		a.log.Fatal(logs.NoHealthyServers)
+		a.log.Fatal(logs.NoHealthyServers, logs.TagField(logs.TagApp))
 	}
 }
 
@@ -941,13 +1000,14 @@ func (a *app) initTracing(ctx context.Context) {
 	if trustedCa := a.cfg.GetString(cfgTracingTrustedCa); trustedCa != "" {
 		caBytes, err := os.ReadFile(trustedCa)
 		if err != nil {
-			a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err))
+			a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err), logs.TagField(logs.TagApp))
 			return
 		}
 		certPool := x509.NewCertPool()
 		ok := certPool.AppendCertsFromPEM(caBytes)
 		if !ok {
-			a.log.Warn(logs.FailedToInitializeTracing, zap.String("error", "can't fill cert pool by ca cert"))
+			a.log.Warn(logs.FailedToInitializeTracing, zap.String("error", "can't fill cert pool by ca cert"),
+				logs.TagField(logs.TagApp))
 			return
 		}
 		cfg.ServerCaCertPool = certPool
@@ -955,24 +1015,24 @@ func (a *app) initTracing(ctx context.Context) {
 
 	attributes, err := fetchTracingAttributes(a.cfg)
 	if err != nil {
-		a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err))
+		a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err), logs.TagField(logs.TagConfig))
 		return
 	}
 	cfg.Attributes = attributes
 
 	updated, err := tracing.Setup(ctx, cfg)
 	if err != nil {
-		a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err))
+		a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 	if updated {
-		a.log.Info(logs.TracingConfigUpdated)
+		a.log.Info(logs.TracingConfigUpdated, logs.TagField(logs.TagConfig))
 	}
 }
 
 func (a *app) setRuntimeParameters() {
 	if len(os.Getenv("GOMEMLIMIT")) != 0 {
 		// default limit < yaml limit < app env limit < GOMEMLIMIT
-		a.log.Warn(logs.RuntimeSoftMemoryDefinedWithGOMEMLIMIT)
+		a.log.Warn(logs.RuntimeSoftMemoryDefinedWithGOMEMLIMIT, logs.TagField(logs.TagApp))
 		return
 	}
 
@@ -981,7 +1041,8 @@ func (a *app) setRuntimeParameters() {
 	if softMemoryLimit != previous {
 		a.log.Info(logs.RuntimeSoftMemoryLimitUpdated,
 			zap.Int64("new_value", softMemoryLimit),
-			zap.Int64("old_value", previous))
+			zap.Int64("old_value", previous),
+			logs.TagField(logs.TagApp))
 	}
 }
 
@@ -1007,28 +1068,29 @@ func (a *app) tryReconnect(ctx context.Context, sr *fasthttp.Server) bool {
 	a.mu.Lock()
 	defer a.mu.Unlock()
 
-	a.log.Info(logs.ServerReconnecting)
+	a.log.Info(logs.ServerReconnecting, logs.TagField(logs.TagApp))
 	var failedServers []ServerInfo
 
 	for _, serverInfo := range a.unbindServers {
 		fields := []zap.Field{
 			zap.String("address", serverInfo.Address), zap.Bool("tls enabled", serverInfo.TLS.Enabled),
 			zap.String("tls cert", serverInfo.TLS.CertFile), zap.String("tls key", serverInfo.TLS.KeyFile),
+			logs.TagField(logs.TagApp),
 		}
 
 		srv, err := newServer(ctx, serverInfo)
 		if err != nil {
-			a.log.Warn(logs.ServerReconnectFailed, zap.Error(err))
+			a.log.Warn(logs.ServerReconnectFailed, zap.Error(err), logs.TagField(logs.TagApp))
 			failedServers = append(failedServers, serverInfo)
 			a.metrics.MarkUnhealthy(serverInfo.Address)
 			continue
 		}
 
 		go func() {
-			a.log.Info(logs.StartingServer, zap.String("address", srv.Address()))
+			a.log.Info(logs.StartingServer, zap.String("address", srv.Address()), logs.TagField(logs.TagApp))
 			a.metrics.MarkHealthy(serverInfo.Address)
 			if err = sr.Serve(srv.Listener()); err != nil && !errors.Is(err, http.ErrServerClosed) {
-				a.log.Warn(logs.ListenAndServe, zap.Error(err))
+				a.log.Warn(logs.ListenAndServe, zap.Error(err), logs.TagField(logs.TagApp))
 				a.metrics.MarkUnhealthy(serverInfo.Address)
 			}
 		}()

cmd/http-gw/logger.go

@@ -0,0 +1,182 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
+	"git.frostfs.info/TrueCloudLab/zapjournald"
+	"github.com/spf13/viper"
+	"github.com/ssgreg/journald"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func getLogLevel(v *viper.Viper) (zapcore.Level, error) {
+	var lvl zapcore.Level
+	lvlStr := v.GetString(cfgLoggerLevel)
+	err := lvl.UnmarshalText([]byte(lvlStr))
+	if err != nil {
+		return lvl, fmt.Errorf("incorrect logger level configuration %s (%v), "+
+			"value should be one of %v", lvlStr, err, [...]zapcore.Level{
+			zapcore.DebugLevel,
+			zapcore.InfoLevel,
+			zapcore.WarnLevel,
+			zapcore.ErrorLevel,
+			zapcore.DPanicLevel,
+			zapcore.PanicLevel,
+			zapcore.FatalLevel,
+		})
+	}
+	return lvl, nil
+}
+
+var _ zapcore.Core = (*zapCoreTagFilterWrapper)(nil)
+
+type zapCoreTagFilterWrapper struct {
+	core     zapcore.Core
+	settings TagFilterSettings
+	extra    []zap.Field
+}
+
+type TagFilterSettings interface {
+	LevelEnabled(tag string, lvl zapcore.Level) bool
+}
+
+func (c *zapCoreTagFilterWrapper) Enabled(level zapcore.Level) bool {
+	return c.core.Enabled(level)
+}
+
+func (c *zapCoreTagFilterWrapper) With(fields []zapcore.Field) zapcore.Core {
+	return &zapCoreTagFilterWrapper{
+		core:     c.core.With(fields),
+		settings: c.settings,
+		extra:    append(c.extra, fields...),
+	}
+}
+
+func (c *zapCoreTagFilterWrapper) Check(entry zapcore.Entry, checked *zapcore.CheckedEntry) *zapcore.CheckedEntry {
+	if c.core.Enabled(entry.Level) {
+		return checked.AddCore(entry, c)
+	}
+	return checked
+}
+
+func (c *zapCoreTagFilterWrapper) Write(entry zapcore.Entry, fields []zapcore.Field) error {
+	if c.shouldSkip(entry, fields) || c.shouldSkip(entry, c.extra) {
+		return nil
+	}
+
+	return c.core.Write(entry, fields)
+}
+
+func (c *zapCoreTagFilterWrapper) shouldSkip(entry zapcore.Entry, fields []zap.Field) bool {
+	for _, field := range fields {
+		if field.Key == logs.TagFieldName && field.Type == zapcore.StringType {
+			if !c.settings.LevelEnabled(field.String, entry.Level) {
+				return true
+			}
+			break
+		}
+	}
+
+	return false
+}
+
+func (c *zapCoreTagFilterWrapper) Sync() error {
+	return c.core.Sync()
+}
+
+func applyZapCoreMiddlewares(core zapcore.Core, v *viper.Viper, loggerSettings LoggerAppSettings, tagSetting TagFilterSettings) zapcore.Core {
+	core = &zapCoreTagFilterWrapper{
+		core:     core,
+		settings: tagSetting,
+	}
+
+	if v.GetBool(cfgLoggerSamplingEnabled) {
+		core = zapcore.NewSamplerWithOptions(core,
+			v.GetDuration(cfgLoggerSamplingInterval),
+			v.GetInt(cfgLoggerSamplingInitial),
+			v.GetInt(cfgLoggerSamplingThereafter),
+			zapcore.SamplerHook(func(_ zapcore.Entry, dec zapcore.SamplingDecision) {
+				if dec&zapcore.LogDropped > 0 {
+					loggerSettings.DroppedLogsInc()
+				}
+			}))
+	}
+
+	return core
+}
+
+func newLogEncoder() zapcore.Encoder {
+	c := zap.NewProductionEncoderConfig()
+	c.EncodeTime = zapcore.ISO8601TimeEncoder
+
+	return zapcore.NewConsoleEncoder(c)
+}
+
+// newStdoutLogger constructs a zap.Logger instance for current application.
+// Panics on failure.
+//
+// Logger is built from zap's production logging configuration with:
+//   - parameterized level (debug by default)
+//   - console encoding
+//   - ISO8601 time encoding
+//
+// Logger records a stack trace for all messages at or above fatal level.
+//
+// See also zapcore.Level, zap.NewProductionConfig, zap.AddStacktrace.
+func newStdoutLogger(v *viper.Viper, lvl zapcore.Level, loggerSettings LoggerAppSettings, tagSetting TagFilterSettings) *Logger {
+	stdout := zapcore.AddSync(os.Stderr)
+	level := zap.NewAtomicLevelAt(lvl)
+
+	consoleOutCore := zapcore.NewCore(newLogEncoder(), stdout, level)
+	consoleOutCore = applyZapCoreMiddlewares(consoleOutCore, v, loggerSettings, tagSetting)
+
+	return &Logger{
+		logger: zap.New(consoleOutCore, zap.AddStacktrace(zap.NewAtomicLevelAt(zap.FatalLevel))),
+		lvl:    level,
+	}
+}
+
+func newJournaldLogger(v *viper.Viper, lvl zapcore.Level, loggerSettings LoggerAppSettings, tagSetting TagFilterSettings) *Logger {
+	level := zap.NewAtomicLevelAt(lvl)
+
+	encoder := zapjournald.NewPartialEncoder(newLogEncoder(), zapjournald.SyslogFields)
+
+	core := zapjournald.NewCore(level, encoder, &journald.Journal{}, zapjournald.SyslogFields)
+	coreWithContext := core.With([]zapcore.Field{
+		zapjournald.SyslogFacility(zapjournald.LogDaemon),
+		zapjournald.SyslogIdentifier(),
+		zapjournald.SyslogPid(),
+	})
+
+	coreWithContext = applyZapCoreMiddlewares(coreWithContext, v, loggerSettings, tagSetting)
+
+	return &Logger{
+		logger: zap.New(coreWithContext, zap.AddStacktrace(zap.NewAtomicLevelAt(zap.FatalLevel))),
+		lvl:    level,
+	}
+}
+
+type LoggerAppSettings interface {
+	DroppedLogsInc()
+}
+
+func pickLogger(v *viper.Viper, loggerSettings LoggerAppSettings, tagSettings TagFilterSettings) *Logger {
+	lvl, err := getLogLevel(v)
+	if err != nil {
+		panic(err)
+	}
+
+	dest := v.GetString(cfgLoggerDestination)
+
+	switch dest {
+	case destinationStdout:
+		return newStdoutLogger(v, lvl, loggerSettings, tagSettings)
+	case destinationJournald:
+		return newJournaldLogger(v, lvl, loggerSettings, tagSettings)
+	default:
+		panic(fmt.Sprintf("wrong destination for logger: %s", dest))
+	}
+}

cmd/http-gw/settings.go

@@ -22,10 +22,8 @@ import (
 	grpctracing "git.frostfs.info/TrueCloudLab/frostfs-observability/tracing/grpc"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
 	treepool "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree"
-	"git.frostfs.info/TrueCloudLab/zapjournald"
 	"github.com/spf13/pflag"
 	"github.com/spf13/viper"
-	"github.com/ssgreg/journald"
 	"github.com/valyala/fasthttp"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
@@ -110,6 +108,11 @@ const (
 	cfgLoggerSamplingThereafter = "logger.sampling.thereafter"
 	cfgLoggerSamplingInterval   = "logger.sampling.interval"
 
+	cfgLoggerTags           = "logger.tags"
+	cfgLoggerTagsPrefixTmpl = cfgLoggerTags + ".%d."
+	cfgLoggerTagsNameTmpl   = cfgLoggerTagsPrefixTmpl + "name"
+	cfgLoggerTagsLevelTmpl  = cfgLoggerTagsPrefixTmpl + "level"
+
 	// Wallet.
 	cfgWalletPassphrase = "wallet.passphrase"
 	cfgWalletPath       = "wallet.path"
@@ -187,6 +190,8 @@ var ignore = map[string]struct{}{
 	cmdVersion: {},
 }
 
+var defaultTags = []string{logs.TagApp, logs.TagConfig, logs.TagDatapath}
+
 type Logger struct {
 	logger *zap.Logger
 	lvl    zap.AtomicLevel
@@ -428,112 +433,39 @@ func mergeConfig(v *viper.Viper, fileName string) error {
 	return v.MergeConfig(cfgFile)
 }
 
-type LoggerAppSettings interface {
-	DroppedLogsInc()
-}
+func fetchLogTagsConfig(v *viper.Viper) (map[string]zapcore.Level, error) {
+	res := make(map[string]zapcore.Level)
 
-func pickLogger(v *viper.Viper, settings LoggerAppSettings) *Logger {
-	lvl, err := getLogLevel(v)
-	if err != nil {
-		panic(err)
+	defaultLevel := v.GetString(cfgLoggerLevel)
+	var defaultLvl zapcore.Level
+	if err := defaultLvl.Set(defaultLevel); err != nil {
+		return nil, fmt.Errorf("failed to parse log level, unknown level: '%s'", defaultLevel)
 	}
 
-	dest := v.GetString(cfgLoggerDestination)
+	for i := 0; ; i++ {
+		name := v.GetString(fmt.Sprintf(cfgLoggerTagsNameTmpl, i))
+		if name == "" {
+			break
+		}
 
-	switch dest {
-	case destinationStdout:
-		return newStdoutLogger(v, lvl, settings)
-	case destinationJournald:
-		return newJournaldLogger(v, lvl, settings)
-	default:
-		panic(fmt.Sprintf("wrong destination for logger: %s", dest))
-	}
-}
+		lvl := defaultLvl
+		level := v.GetString(fmt.Sprintf(cfgLoggerTagsLevelTmpl, i))
+		if level != "" {
+			if err := lvl.Set(level); err != nil {
+				return nil, fmt.Errorf("failed to parse log tags config, unknown level: '%s'", level)
+			}
+		}
 
-// newStdoutLogger constructs a zap.Logger instance for current application.
-// Panics on failure.
-//
-// Logger is built from zap's production logging configuration with:
-//   - parameterized level (debug by default)
-//   - console encoding
-//   - ISO8601 time encoding
-//
-// Logger records a stack trace for all messages at or above fatal level.
-//
-// See also zapcore.Level, zap.NewProductionConfig, zap.AddStacktrace.
-func newStdoutLogger(v *viper.Viper, lvl zapcore.Level, settings LoggerAppSettings) *Logger {
-	stdout := zapcore.AddSync(os.Stderr)
-	level := zap.NewAtomicLevelAt(lvl)
-
-	consoleOutCore := zapcore.NewCore(newLogEncoder(), stdout, level)
-	consoleOutCore = applyZapCoreMiddlewares(consoleOutCore, v, settings)
-
-	return &Logger{
-		logger: zap.New(consoleOutCore, zap.AddStacktrace(zap.NewAtomicLevelAt(zap.FatalLevel))),
-		lvl:    level,
-	}
-}
-
-func newJournaldLogger(v *viper.Viper, lvl zapcore.Level, settings LoggerAppSettings) *Logger {
-	level := zap.NewAtomicLevelAt(lvl)
-
-	encoder := zapjournald.NewPartialEncoder(newLogEncoder(), zapjournald.SyslogFields)
-
-	core := zapjournald.NewCore(level, encoder, &journald.Journal{}, zapjournald.SyslogFields)
-	coreWithContext := core.With([]zapcore.Field{
-		zapjournald.SyslogFacility(zapjournald.LogDaemon),
-		zapjournald.SyslogIdentifier(),
-		zapjournald.SyslogPid(),
-	})
-
-	coreWithContext = applyZapCoreMiddlewares(coreWithContext, v, settings)
-
-	return &Logger{
-		logger: zap.New(coreWithContext, zap.AddStacktrace(zap.NewAtomicLevelAt(zap.FatalLevel))),
-		lvl:    level,
-	}
-}
-
-func newLogEncoder() zapcore.Encoder {
-	c := zap.NewProductionEncoderConfig()
-	c.EncodeTime = zapcore.ISO8601TimeEncoder
-
-	return zapcore.NewConsoleEncoder(c)
-}
-
-func applyZapCoreMiddlewares(core zapcore.Core, v *viper.Viper, settings LoggerAppSettings) zapcore.Core {
-	if v.GetBool(cfgLoggerSamplingEnabled) {
-		core = zapcore.NewSamplerWithOptions(core,
-			v.GetDuration(cfgLoggerSamplingInterval),
-			v.GetInt(cfgLoggerSamplingInitial),
-			v.GetInt(cfgLoggerSamplingThereafter),
-			zapcore.SamplerHook(func(_ zapcore.Entry, dec zapcore.SamplingDecision) {
-				if dec&zapcore.LogDropped > 0 {
-					settings.DroppedLogsInc()
-				}
-			}))
+		res[name] = lvl
 	}
 
-	return core
-}
-
-func getLogLevel(v *viper.Viper) (zapcore.Level, error) {
-	var lvl zapcore.Level
-	lvlStr := v.GetString(cfgLoggerLevel)
-	err := lvl.UnmarshalText([]byte(lvlStr))
-	if err != nil {
-		return lvl, fmt.Errorf("incorrect logger level configuration %s (%v), "+
-			"value should be one of %v", lvlStr, err, [...]zapcore.Level{
-			zapcore.DebugLevel,
-			zapcore.InfoLevel,
-			zapcore.WarnLevel,
-			zapcore.ErrorLevel,
-			zapcore.DPanicLevel,
-			zapcore.PanicLevel,
-			zapcore.FatalLevel,
-		})
+	if len(res) == 0 && !v.IsSet(cfgLoggerTags) {
+		for _, tag := range defaultTags {
+			res[tag] = defaultLvl
+		}
 	}
-	return lvl, nil
+
+	return res, nil
 }
 
 func fetchReconnectInterval(cfg *viper.Viper) time.Duration {
@@ -552,17 +484,17 @@ func fetchIndexPageTemplate(v *viper.Viper, l *zap.Logger) (string, bool) {
 
 	reader, err := os.Open(v.GetString(cfgIndexPageTemplatePath))
 	if err != nil {
-		l.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err))
+		l.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err), logs.TagField(logs.TagApp))
 		return "", true
 	}
 
 	tmpl, err := io.ReadAll(reader)
 	if err != nil {
-		l.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err))
+		l.Warn(logs.FailedToReadIndexPageTemplate, zap.Error(err), logs.TagField(logs.TagApp))
 		return "", true
 	}
 
-	l.Info(logs.SetCustomIndexPageTemplate)
+	l.Info(logs.SetCustomIndexPageTemplate, logs.TagField(logs.TagApp))
 	return string(tmpl), true
 }
 
@@ -603,7 +535,7 @@ func fetchServers(v *viper.Viper, log *zap.Logger) []ServerInfo {
 		}
 
 		if _, ok := seen[serverInfo.Address]; ok {
-			log.Warn(logs.WarnDuplicateAddress, zap.String("address", serverInfo.Address))
+			log.Warn(logs.WarnDuplicateAddress, zap.String("address", serverInfo.Address), logs.TagField(logs.TagConfig))
 			continue
 		}
 		seen[serverInfo.Address] = struct{}{}
@@ -616,7 +548,7 @@ func fetchServers(v *viper.Viper, log *zap.Logger) []ServerInfo {
 func (a *app) initPools(ctx context.Context) {
 	key, err := getFrostFSKey(a.cfg, a.log)
 	if err != nil {
-		a.log.Fatal(logs.CouldNotLoadFrostFSPrivateKey, zap.Error(err))
+		a.log.Fatal(logs.CouldNotLoadFrostFSPrivateKey, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 
 	var prm pool.InitParameters
@@ -624,7 +556,8 @@ func (a *app) initPools(ctx context.Context) {
 
 	prm.SetKey(&key.PrivateKey)
 	prmTree.SetKey(key)
-	a.log.Info(logs.UsingCredentials, zap.String("FrostFS", hex.EncodeToString(key.PublicKey().Bytes())))
+	a.log.Info(logs.UsingCredentials, zap.String("FrostFS", hex.EncodeToString(key.PublicKey().Bytes())),
+		logs.TagField(logs.TagApp))
 
 	for _, peer := range fetchPeers(a.log, a.cfg) {
 		prm.AddNode(peer)
@@ -679,11 +612,11 @@ func (a *app) initPools(ctx context.Context) {
 
 	p, err := pool.NewPool(prm)
 	if err != nil {
-		a.log.Fatal(logs.FailedToCreateConnectionPool, zap.Error(err))
+		a.log.Fatal(logs.FailedToCreateConnectionPool, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 
 	if err = p.Dial(ctx); err != nil {
-		a.log.Fatal(logs.FailedToDialConnectionPool, zap.Error(err))
+		a.log.Fatal(logs.FailedToDialConnectionPool, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 
 	if a.cfg.GetBool(cfgFeaturesTreePoolNetmapSupport) {
@@ -692,10 +625,10 @@ func (a *app) initPools(ctx context.Context) {
 
 	treePool, err := treepool.NewPool(prmTree)
 	if err != nil {
-		a.log.Fatal(logs.FailedToCreateTreePool, zap.Error(err))
+		a.log.Fatal(logs.FailedToCreateTreePool, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 	if err = treePool.Dial(ctx); err != nil {
-		a.log.Fatal(logs.FailedToDialTreePool, zap.Error(err))
+		a.log.Fatal(logs.FailedToDialTreePool, zap.Error(err), logs.TagField(logs.TagApp))
 	}
 
 	a.pool = p
@@ -726,7 +659,8 @@ func fetchPeers(l *zap.Logger, v *viper.Viper) []pool.NodeParam {
 		l.Info(logs.AddedStoragePeer,
 			zap.Int("priority", priority),
 			zap.String("address", address),
-			zap.Float64("weight", weight))
+			zap.Float64("weight", weight),
+			logs.TagField(logs.TagConfig))
 	}
 
 	return nodes
@@ -765,7 +699,8 @@ func fetchCacheLifetime(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultV
 			l.Error(logs.InvalidLifetimeUsingDefaultValue,
 				zap.String("parameter", cfgEntry),
 				zap.Duration("value in config", lifetime),
-				zap.Duration("default", defaultValue))
+				zap.Duration("default", defaultValue),
+				logs.TagField(logs.TagConfig))
 		} else {
 			return lifetime
 		}
@@ -781,7 +716,8 @@ func fetchCacheSize(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue
 			l.Error(logs.InvalidCacheSizeUsingDefaultValue,
 				zap.String("parameter", cfgEntry),
 				zap.Int("value in config", size),
-				zap.Int("default", defaultValue))
+				zap.Int("default", defaultValue),
+				logs.TagField(logs.TagConfig))
 		} else {
 			return size
 		}
@@ -793,7 +729,7 @@ func fetchCacheSize(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue
 func getDialerSource(logger *zap.Logger, cfg *viper.Viper) *internalnet.DialerSource {
 	source, err := internalnet.NewDialerSource(fetchMultinetConfig(cfg, logger))
 	if err != nil {
-		logger.Fatal(logs.FailedToLoadMultinetConfig, zap.Error(err))
+		logger.Fatal(logs.FailedToLoadMultinetConfig, zap.Error(err), logs.TagField(logs.TagConfig))
 	}
 	return source
 }