multi: rename and export logWriter as RootLogWriter

config.go

@@ -971,12 +971,12 @@ func ValidateConfig(cfg Config, usageMessage string) (*Config, error) {
 	// Special show command to list supported subsystems and exit.
 	if cfg.DebugLevel == "show" {
 		fmt.Println("Supported subsystems",
-			logWriter.SupportedSubsystems())
+			RootLogWriter.SupportedSubsystems())
 		os.Exit(0)
 	}
 
 	// Initialize logging at the default logging level.
-	err = logWriter.InitLogRotator(
+	err = RootLogWriter.InitLogRotator(
 		filepath.Join(cfg.LogDir, defaultLogFilename),
 		cfg.MaxLogFileSize, cfg.MaxLogFiles,
 	)
@@ -988,7 +988,7 @@ func ValidateConfig(cfg Config, usageMessage string) (*Config, error) {
 	}
 
 	// Parse, validate, and set debug log level(s).
-	err = build.ParseAndSetDebugLevels(cfg.DebugLevel, logWriter)
+	err = build.ParseAndSetDebugLevels(cfg.DebugLevel, RootLogWriter)
 	if err != nil {
 		err = fmt.Errorf("%s: %v", funcName, err.Error())
 		_, _ = fmt.Fprintln(os.Stderr, err)

lnd.go

@@ -163,7 +163,7 @@ func Main(lisCfg ListenerCfg) error {
 	cfg = loadedConfig
 	defer func() {
 		ltndLog.Info("Shutdown complete")
-		err := logWriter.Close()
+		err := RootLogWriter.Close()
 		if err != nil {
 			ltndLog.Errorf("Could not close log rotator: %v", err)
 		}

log.go

@@ -47,21 +47,23 @@ import (
 //
 // Loggers can not be used before the log rotator has been initialized with a
 // log file.  This must be performed early during application startup by
-// calling logWriter.InitLogRotator.
+// calling RootLogWriter.InitLogRotator.
 var (
-	logWriter = build.NewRotatingLogWriter()
+	// RootLogWriter is the main parent log writer all sub loggers should be
+	// appended to.
+	RootLogWriter = build.NewRotatingLogWriter()
 
 	// Loggers that need to be accessible from the lnd package can be placed
 	// here. Loggers that are only used in sub modules can be added directly
 	// by using the addSubLogger method.
-	ltndLog = build.NewSubLogger("LTND", logWriter.GenSubLogger)
-	peerLog = build.NewSubLogger("PEER", logWriter.GenSubLogger)
-	rpcsLog = build.NewSubLogger("RPCS", logWriter.GenSubLogger)
-	srvrLog = build.NewSubLogger("SRVR", logWriter.GenSubLogger)
-	fndgLog = build.NewSubLogger("FNDG", logWriter.GenSubLogger)
-	utxnLog = build.NewSubLogger("UTXN", logWriter.GenSubLogger)
-	brarLog = build.NewSubLogger("BRAR", logWriter.GenSubLogger)
-	atplLog = build.NewSubLogger("ATPL", logWriter.GenSubLogger)
+	ltndLog = build.NewSubLogger("LTND", RootLogWriter.GenSubLogger)
+	peerLog = build.NewSubLogger("PEER", RootLogWriter.GenSubLogger)
+	rpcsLog = build.NewSubLogger("RPCS", RootLogWriter.GenSubLogger)
+	srvrLog = build.NewSubLogger("SRVR", RootLogWriter.GenSubLogger)
+	fndgLog = build.NewSubLogger("FNDG", RootLogWriter.GenSubLogger)
+	utxnLog = build.NewSubLogger("UTXN", RootLogWriter.GenSubLogger)
+	brarLog = build.NewSubLogger("BRAR", RootLogWriter.GenSubLogger)
+	atplLog = build.NewSubLogger("ATPL", RootLogWriter.GenSubLogger)
 )
 
 // Initialize package-global logger variables.
@@ -112,7 +114,7 @@ func init() {
 func addSubLogger(subsystem string, useLoggers ...func(btclog.Logger)) {
 	// Create and register just a single logger to prevent them from
 	// overwriting each other internally.
-	logger := build.NewSubLogger(subsystem, logWriter.GenSubLogger)
+	logger := build.NewSubLogger(subsystem, RootLogWriter.GenSubLogger)
 	setSubLogger(subsystem, logger, useLoggers...)
 }
 
@@ -121,7 +123,7 @@ func addSubLogger(subsystem string, useLoggers ...func(btclog.Logger)) {
 func setSubLogger(subsystem string, logger btclog.Logger,
 	useLoggers ...func(btclog.Logger)) {
 
-	logWriter.RegisterSubLogger(subsystem, logger)
+	RootLogWriter.RegisterSubLogger(subsystem, logger)
 	for _, useLogger := range useLoggers {
 		useLogger(logger)
 	}

rpcserver.go

@@ -5220,7 +5220,7 @@ func (r *rpcServer) DebugLevel(ctx context.Context,
 	if req.Show {
 		return &lnrpc.DebugLevelResponse{
 			SubSystems: strings.Join(
-				logWriter.SupportedSubsystems(), " ",
+				RootLogWriter.SupportedSubsystems(), " ",
 			),
 		}, nil
 	}
@@ -5229,7 +5229,7 @@ func (r *rpcServer) DebugLevel(ctx context.Context,
 
 	// Otherwise, we'll attempt to set the logging level using the
 	// specified level spec.
-	err := build.ParseAndSetDebugLevels(req.LevelSpec, logWriter)
+	err := build.ParseAndSetDebugLevels(req.LevelSpec, RootLogWriter)
 	if err != nil {
 		return nil, err
 	}