Golang SafeListLimited.PopBackBy方法代码示例

// Judge定时任务, 将 Judge发送缓存中的数据 通过rpc连接池 发送到Judge
func forward2JudgeTask(Q *list.SafeListLimited, node string, concurrent int) {
	batch := g.Config().Judge.Batch // 一次发送,最多batch条数据
	addr := g.Config().Judge.Cluster[node]
	sema := nsema.NewSemaphore(concurrent)

	for {
		items := Q.PopBackBy(batch)
		count := len(items)
		if count == 0 {
			time.Sleep(DefaultSendTaskSleepInterval)
			continue
		}

		judgeItems := make([]*cmodel.JudgeItem, count)
		for i := 0; i < count; i++ {
			judgeItems[i] = items[i].(*cmodel.JudgeItem)
		}

		//	同步Call + 有限并发 进行发送
		sema.Acquire()
		go func(addr string, judgeItems []*cmodel.JudgeItem, count int) {
			defer sema.Release()

			resp := &cmodel.SimpleRpcResponse{}
			var err error
			sendOk := false
			for i := 0; i < 3; i++ { //最多重试3次
				err = JudgeConnPools.Call(addr, "Judge.Send", judgeItems, resp)
				if err == nil {
					sendOk = true
					break
				}
				time.Sleep(time.Millisecond * 10)
			}

			// statistics
			if !sendOk {
				log.Printf("send judge %s:%s fail: %v", node, addr, err)
				proc.SendToJudgeFailCnt.IncrBy(int64(count))
			} else {
				proc.SendToJudgeCnt.IncrBy(int64(count))
			}
		}(addr, judgeItems, count)
	}
}

// Graph定时任务, 进行数据迁移时的 数据冗余发送
func forward2GraphMigratingTask(Q *list.SafeListLimited, node string, addr string, concurrent int) {
	batch := g.Config().Graph.Batch // 一次发送,最多batch条数据
	sema := nsema.NewSemaphore(concurrent)

	for {
		items := Q.PopBackBy(batch)
		count := len(items)
		if count == 0 {
			time.Sleep(DefaultSendTaskSleepInterval)
			continue
		}

		graphItems := make([]*cmodel.GraphItem, count)
		for i := 0; i < count; i++ {
			graphItems[i] = items[i].(*cmodel.GraphItem)
		}

		sema.Acquire()
		go func(addr string, graphItems []*cmodel.GraphItem, count int) {
			defer sema.Release()

			resp := &cmodel.SimpleRpcResponse{}
			var err error
			sendOk := false
			for i := 0; i < 3; i++ { //最多重试3次
				err = GraphMigratingConnPools.Call(addr, "Graph.Send", graphItems, resp)
				if err == nil {
					sendOk = true
					break
				}
				time.Sleep(time.Millisecond * 10) //发送失败了,睡10ms
			}

			// statistics
			if !sendOk {
				log.Printf("send to graph migrating %s:%s fail: %v", node, addr, err)
				proc.SendToGraphMigratingFailCnt.IncrBy(int64(count))
			} else {
				proc.SendToGraphMigratingCnt.IncrBy(int64(count))
			}
		}(addr, graphItems, count)
	}
}

// Tsdb定时任务, 将 Tsdb发送缓存中的数据 通过api连接池 发送到Tsdb
// 单个Cluster配置多个influxdb地址，修改为并发发送。
func forward2InfluxdbTask(Q *list.SafeListLimited, node string, concurrent int) {
	cfg := g.Config()
	batch := cfg.Influxdb.Batch // 一次发送,最多batch条数据
	sema := nsema.NewSemaphore(concurrent * len(cfg.Influxdb.Cluster2[node].Addrs))
	retry := cfg.Influxdb.MaxRetry

	for {
		items := Q.PopBackBy(batch)
		count := len(items)
		if count == 0 {
			time.Sleep(DefaultSendTaskSleepInterval)
			continue
		}
		pts := make([]*client.Point, count)
		for i := 0; i < count; i++ {
			pts[i] = items[i].(*client.Point)
		}
		for _, addr := range cfg.Influxdb.Cluster2[node].Addrs {
			sema.Acquire()
			go coreSend2Influxdb(addr, sema, retry, pts)
		}

	}
}

func forward2TransferTask(Q *nlist.SafeListLimited, concurrent int32) {
	cfg := g.Config()
	batch := int(cfg.Transfer.Batch)
	maxConns := int64(cfg.Transfer.MaxConns)
	retry := int(cfg.Transfer.Retry)
	if retry < 1 {
		retry = 1
	}

	sema := nsema.NewSemaphore(int(concurrent))
	transNum := len(TransferHostnames)

	for {
		items := Q.PopBackBy(batch)
		count := len(items)
		if count == 0 {
			time.Sleep(time.Millisecond * 50)
			continue
		}

		transItems := make([]*cmodel.MetricValue, count)
		for i := 0; i < count; i++ {
			transItems[i] = convert(items[i].(*cmodel.MetaData))
		}

		sema.Acquire()
		go func(transItems []*cmodel.MetricValue, count int) {
			defer sema.Release()
			var err error

			// 随机遍历transfer列表，直到数据发送成功 或者 遍历完;随机遍历，可以缓解慢transfer
			resp := &g.TransferResp{}
			sendOk := false

			for j := 0; j < retry && !sendOk; j++ {
				rint := rand.Int()
				for i := 0; i < transNum && !sendOk; i++ {
					idx := (i + rint) % transNum
					host := TransferHostnames[idx]
					addr := TransferMap[host]

					// 过滤掉建连缓慢的host, 否则会严重影响发送速率
					cc := pfc.GetCounterCount(host)
					if cc >= maxConns {
						continue
					}

					pfc.Counter(host, 1)
					err = SenderConnPools.Call(addr, "Transfer.Update", transItems, resp)
					pfc.Counter(host, -1)

					if err == nil {
						sendOk = true
						// statistics
						TransferSendCnt[host].IncrBy(int64(count))
					} else {
						// statistics
						TransferSendFailCnt[host].IncrBy(int64(count))
					}
				}
			}

			// statistics
			if !sendOk {
				if cfg.Debug {
					log.Printf("send to transfer fail, connpool:%v", SenderConnPools.Proc())
				}
				pfc.Meter("SendFail", int64(count))
			} else {
				pfc.Meter("Send", int64(count))
			}
		}(transItems, count)
	}
}