add logger path option

pkg/etcdmtr/log.go

@@ -37,6 +37,7 @@ type LogFormatTokenValue int64
 const (
 	LOGFORMAT_STRING LogFormatTokenValue = iota
 	LOGFORMAT_TIMESTAMP
+	LOGFORMAT_PATH
 	LOGFORMAT_NAME
 	LOGFORMAT_LEVEL
 	LOGFORMAT_MESSAGE
@@ -99,7 +100,9 @@ func NewRootLogger() *ELog {
 			AppendString("] ").
 			AppendToken(LOGFORMAT_LEVEL).
 			AppendString(" ").
-			AppendToken(LOGFORMAT_NAME).
+			AppendToken(LOGFORMAT_PATH).
+			//AppendString(" ").
+			//AppendToken(LOGFORMAT_NAME).
 			AppendString(": ").
 			AppendToken(LOGFORMAT_MESSAGE),
 	)
@@ -107,14 +110,38 @@ func NewRootLogger() *ELog {
 
 func NewRootLoggerWithFormat(format *LogFormat) *ELog {
 	return &ELog{
+		name:   "main",
 		Format: format,
 	}
 }
 
+func (e *ELog) GetLogger(name string) *ELog {
+	return &ELog{
+		parent:       e,
+		name:         name,
+		Level:        e.Level,
+		DefaultLevel: e.DefaultLevel,
+	}
+}
+
 func (e *ELog) _Log(level LogLevel, message string, a ...any) (n int, err error) {
+	return e._DoLog(level, nil, message, a...)
+}
+
+func (e *ELog) _DoLog(level LogLevel, path []string, message string, a ...any) (n int, err error) {
 	if level < e.Level {
 		return 0, nil
 	}
+
+	if path == nil {
+		path = make([]string, 0)
+	}
+	path = append([]string{e.name}, path...)
+
+	if e.parent != nil {
+		return e.parent._DoLog(level, path, message, a...)
+	}
+
 	log := strings.Builder{}
 	tail := e.Format.Head
 	for tail != nil {
@@ -124,11 +151,13 @@ func (e *ELog) _Log(level LogLevel, message string, a ...any) (n int, err error)
 		case LOGFORMAT_TIMESTAMP:
 			log.WriteString(formatTime(tail.Value))
 		case LOGFORMAT_NAME:
-			log.WriteString("main")
+			log.WriteString(path[len(path)-1])
 		case LOGFORMAT_MESSAGE:
 			log.WriteString(fmt.Sprintf(message, a...))
 		case LOGFORMAT_LEVEL:
 			log.WriteString(level.String())
+		case LOGFORMAT_PATH:
+			log.WriteString(strings.Join(path, "."))
 		default:
 			panic(fmt.Sprintf("bad log format token: %v", token))
 		}