Golang ClientV2.SendingMessage方法代碼示例

//.........這裏部分代碼省略.........
			flusherChan = outputBufferTicker.C
		}

		select {
		case <-client.ExitChan:
			goto exit
		case <-flusherChan:
			// if this case wins, we're either starved
			// or we won the race between other channels...
			// in either case, force flush
			client.LockWrite()
			err = client.Flush()
			client.UnlockWrite()
			if err != nil {
				goto exit
			}
			flushed = true
		case <-client.ReadyStateChan:
		case subChannel = <-subEventChan:
			// you can't SUB anymore
			nsqd.NsqLogger().Logf("client %v sub to channel: %v", client.ID,
				subChannel.GetName())
			subEventChan = nil
		case identifyData := <-identifyEventChan:
			// you can't IDENTIFY anymore
			identifyEventChan = nil

			outputBufferTicker.Stop()
			if identifyData.OutputBufferTimeout > 0 {
				outputBufferTicker = time.NewTicker(identifyData.OutputBufferTimeout)
			}

			heartbeatTicker.Stop()
			heartbeatChan = nil
			if identifyData.HeartbeatInterval > 0 {
				heartbeatTicker = time.NewTicker(identifyData.HeartbeatInterval)
				heartbeatChan = heartbeatTicker.C
			}

			if identifyData.SampleRate > 0 {
				sampleRate = identifyData.SampleRate
			}

			msgTimeout = identifyData.MsgTimeout
		case <-heartbeatChan:
			if subChannel != nil && client.IsReadyForMessages() {
				// try wake up the channel
				subChannel.TryWakeupRead()
			}

			err = Send(client, frameTypeResponse, heartbeatBytes)
			nsqd.NsqLogger().LogDebugf("PROTOCOL(V2): [%s] send heartbeat", client)
			if err != nil {
				heartbeatFailedCnt++
				nsqd.NsqLogger().LogWarningf("PROTOCOL(V2): [%s] send heartbeat failed %v times, %v", client, heartbeatFailedCnt, err)
				if heartbeatFailedCnt > 2 {
					goto exit
				}
			} else {
				heartbeatFailedCnt = 0
			}
		case msg, ok := <-clientMsgChan:
			if !ok {
				goto exit
			}

			if sampleRate > 0 && rand.Int31n(100) > sampleRate {
				// FIN automatically, all message will not wait to confirm if not sending,
				// and the reader keep moving forward.
				offset, _, _, _ := subChannel.ConfirmBackendQueue(msg)
				// TODO: sync to replica nodes.
				_ = offset
				continue
			}
			// avoid re-send some confirmed message,
			// this may happen while the channel reader is reset to old position
			// due to some retry or leader change.
			if subChannel.IsConfirmed(msg) {
				continue
			}

			subChannel.StartInFlightTimeout(msg, client.ID, client.String(), msgTimeout)
			client.SendingMessage()
			err = SendMessage(client, msg, &buf, subChannel.IsOrdered())
			if err != nil {
				goto exit
			}
			flushed = false
		}
	}

exit:
	nsqd.NsqLogger().LogDebugf("PROTOCOL(V2): [%s] exiting messagePump", client)
	heartbeatTicker.Stop()
	outputBufferTicker.Stop()
	if err != nil {
		nsqd.NsqLogger().Logf("PROTOCOL(V2): [%s] messagePump error - %s", client, err)
	}
	close(stoppedChan)
}