聊聊rocketmqclientgo的TraceInterceptor

• Z时代
• 2024-01-10
• 分类：综合

序

本文主要研究一下rocketmq-client-go的TraceInterceptor

TraceInterceptor

rocketmq-client-go-v2.0.0/producer/interceptor.go

// WithTrace support rocketmq trace: https://github.com/apache/rocketmq/wiki/RIP-6-Message-Trace.
func WithTrace(traceCfg *primitive.TraceConfig) Option {
	return func(options *producerOptions) {
		ori := options.Interceptors
		options.Interceptors = make([]primitive.Interceptor, 0)
		options.Interceptors = append(options.Interceptors, newTraceInterceptor(traceCfg))
		options.Interceptors = append(options.Interceptors, ori...)
	}
}

• WithTrace方法在options.Interceptors后追加TraceInterceptor

newTraceInterceptor

rocketmq-client-go-v2.0.0/producer/interceptor.go

func newTraceInterceptor(traceCfg *primitive.TraceConfig) primitive.Interceptor {
	dispatcher := internal.NewTraceDispatcher(traceCfg)
	dispatcher.Start()
	return func(ctx context.Context, req, reply interface{}, next primitive.Invoker) error {
		beginT := time.Now()
		err := next(ctx, req, reply)
		producerCtx := primitive.GetProducerCtx(ctx)
		if producerCtx.Message.Topic == dispatcher.GetTraceTopicName() {
			return next(ctx, req, reply)
		}
		// SendOneway && SendAsync has no reply.
		if reply == nil {
			return err
		}
		result := reply.(*primitive.SendResult)
		if result.RegionID == "" || !result.TraceOn {
			return err
		}
		sendSuccess := result.Status == primitive.SendOK
		costT := time.Since(beginT).Nanoseconds() / int64(time.Millisecond)
		storeT := beginT.UnixNano()/int64(time.Millisecond) + costT/2
		traceBean := internal.TraceBean{
			Topic:       producerCtx.Message.Topic,
			Tags:        producerCtx.Message.GetTags(),
			Keys:        producerCtx.Message.GetKeys(),
			StoreHost:   producerCtx.BrokerAddr,
			ClientHost:  utils.LocalIP,
			BodyLength:  len(producerCtx.Message.Body),
			MsgType:     producerCtx.MsgType,
			MsgId:       result.MsgID,
			OffsetMsgId: result.OffsetMsgID,
			StoreTime:   storeT,
		}
		traceCtx := internal.TraceContext{
			RequestId: primitive.CreateUniqID(), // set id
			TimeStamp: time.Now().UnixNano() / int64(time.Millisecond),
			TraceType:  internal.Pub,
			GroupName:  producerCtx.ProducerGroup,
			RegionId:   result.RegionID,
			TraceBeans: []internal.TraceBean{traceBean},
			CostTime:   costT,
			IsSuccess:  sendSuccess,
		}
		dispatcher.Append(traceCtx)
		return err
	}
}

• newTraceInterceptor方法首先通过internal.NewTraceDispatcher(traceCfg)创建dispatcher，然后执行dispatcher.Start方法，之后返回一个func，该func会构造traceCtx，然后执行dispatcher.Append(traceCtx)

小结

WithTrace方法在options.Interceptors后追加TraceInterceptor；而newTraceInterceptor方法则创建TraceInterceptor

doc

• interceptor

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