now it's a real logging library

pkg/etcdmtr/log.go

@@ -17,14 +17,45 @@ const (
 )
 
 type ELog struct {
+	parent       *ELog
+	name         string
+	Level        LogLevel
+	DefaultLevel LogLevel
+}
+
+func (e *ELog) _Log(level LogLevel, message string, a ...any) (n int, err error) {
+	if level >= e.Level {
+		return fmt.Printf(message+"\n", a...)
+	}
+	return 0, nil
 }
 
 func (e *ELog) Log(message string, a ...any) (n int, err error) {
-	return fmt.Printf(message+"\n", a...)
+	return e._Log(e.DefaultLevel, message, a...)
+}
+
+func (e *ELog) Debug(message string, a ...any) (n int, err error) {
+	return e._Log(LOGLEVEL_DEBUG, message, a...)
+}
+
+func (e *ELog) Info(message string, a ...any) (n int, err error) {
+	return e._Log(LOGLEVEL_INFO, message, a...)
+}
+
+func (e *ELog) Warning(message string, a ...any) (n int, err error) {
+	return e._Log(LOGLEVEL_WARNING, message, a...)
+}
+
+func (e *ELog) Error(message string, a ...any) (n int, err error) {
+	return e._Log(LOGLEVEL_ERROR, message, a...)
+}
+
+func (e *ELog) Critical(message string, a ...any) (n int, err error) {
+	return e._Log(LOGLEVEL_CRITICAL, message, a...)
 }
 
 func (e *ELog) Fatal(message string, a ...any) (n int, err error) {
-	e.Log(message, a...)
+	e._Log(LOGLEVEL_FATAL, message, a...)
 	os.Exit(1)
 	return 0, nil
 }