this was already implemented for config

log.go

@@ -7,10 +7,8 @@ package main
 
 import (
 	"os"
-	"strings"
 
 	"decred.org/dcrwallet/v5/chain"
-	"decred.org/dcrwallet/v5/errors"
 	"decred.org/dcrwallet/v5/internal/loader"
 	"decred.org/dcrwallet/v5/internal/loggers"
 	"decred.org/dcrwallet/v5/internal/rpc/jsonrpc"
@@ -85,37 +83,6 @@ func setLogLevels(logLevel string) {
 	}
 }
 
-// setLogLevelSpec sets all loggers, or a specific logger (when levelSpec is
-// prefixed by the subsystem and an equals sign) to a particular log level.
-func setLogLevelSpec(levelSpec string) error {
-	var subsys, level string
-
-	equals := strings.Index(levelSpec, "=")
-	if equals != -1 {
-		subsys = levelSpec[:equals]
-		level = levelSpec[equals+1:]
-	} else {
-		level = levelSpec
-	}
-
-	if subsys != "" {
-		if _, ok := subsystemLoggers[subsys]; !ok {
-			return errors.Errorf("subsystem %q does not exist", subsys)
-		}
-	}
-
-	if _, ok := slog.LevelFromString(level); !ok {
-		return errors.Errorf("%q is not a valid log level", level)
-	}
-
-	if subsys != "" {
-		setLogLevel(subsys, level)
-	} else {
-		setLogLevels(level)
-	}
-	return nil
-}
-
 // fatalf logs a message, flushes the logger, and finally exit the process with
 // a non-zero return code.
 func fatalf(format string, args ...any) {

rpcserver.go

@@ -242,7 +242,7 @@ func (rpcLoggers) Subsystems() []string {
 }
 
 func (rpcLoggers) SetLevels(levelSpec string) error {
-	return setLogLevelSpec(levelSpec)
+	return parseAndSetDebugLevels(levelSpec)
 }
 
 func startRPCServers(walletLoader *loader.Loader) (*grpc.Server, *jsonrpc.Server, error) {