allowing use printToStdout, printToFile and printToWriter at the same…

… time for Logger of package glog (#2990)

os/glog/glog_logger.go

@@ -222,21 +222,22 @@ func (l *Logger) print(ctx context.Context, level int, stack string, values ...a
 // doDefaultPrint outputs the logging content according configuration.
 func (l *Logger) doDefaultPrint(ctx context.Context, input *HandlerInput) *bytes.Buffer {
  var buffer *bytes.Buffer
- if l.config.Writer == nil {
- // Allow output to stdout?
- if l.config.StdoutPrint {
- if buf := l.printToStdout(ctx, input); buf != nil {
- buffer = buf
- }
+ // Allow output to stdout?
+ if l.config.StdoutPrint {
+ if buf := l.printToStdout(ctx, input); buf != nil {
+ buffer = buf
  }
+ }
 
- // Output content to disk file.
- if l.config.Path != "" {
- if buf := l.printToFile(ctx, input.Time, input); buf != nil {
- buffer = buf
- }
+ // Output content to disk file.
+ if l.config.Path != "" {
+ if buf := l.printToFile(ctx, input.Time, input); buf != nil {
+ buffer = buf
  }
- } else {
+ }
+
+ // Used custom writer.
+ if l.config.Writer != nil {
  // Output to custom writer.
  if buf := l.printToWriter(ctx, input); buf != nil {
  buffer = buf