code: func WaitTimeSeconds(seconds int64) broker.SubscribeOption {
  	return func(o *broker.SubscribeOptions) {
  		if o.Context == nil {
  			o.Context = context.Background()
  		}
  		o.Context = context.WithValue(o.Context, waitTimeSecondsKey{}, seconds)
  	}
  }
docs: // WaitTimeSeconds controls the length of long polling for available messages