improve handler feature for package glog

os/glog/glog_logger.go

@@ -62,7 +62,6 @@ func New() *Logger {
 		init:   gtype.NewBool(),
 		config: DefaultConfig(),
 	}
-	logger.config.Handlers = []Handler{defaultHandler}
 	return logger
 }
 

os/glog/glog_logger_config.go

@@ -250,5 +250,5 @@ func (l *Logger) SetPrefix(prefix string) {
 
 // SetHandlers sets the logging handlers for current logger.
 func (l *Logger) SetHandlers(handlers ...Handler) {
-	l.config.Handlers = append(handlers, defaultHandler)
+	l.config.Handlers = handlers
 }

os/glog/glog_logger_handler.go

@@ -75,5 +75,8 @@ func (i *HandlerInput) Next() {
 	if len(i.logger.config.Handlers)-1 > i.index {
 		i.index++
 		i.logger.config.Handlers[i.index](i.Ctx, i)
+	} else {
+		// The last handler is the default handler.
+		defaultHandler(i.Ctx, i)
 	}
 }