default:
		return fmt.Sprintf("%s:%d and %d(%d) more reasons", reason0, reason0Cnt, len(req.Reason)-1,
			req.Reason.Count()-reason0Cnt)
	}
}

func doSendPushes(stopCh <-chan struct{}, semaphore chan struct{}, queue *PushQueue) {
	for {
		select {
		case <-stopCh:
			return
		default: