Exemple #1
0
//
// 获取下一个可用的Worker
//
func (pq *PriorityQueue) NextWorker() *Worker {
	now := time.Now()
	for pq.Len() > 0 {
		result := (*pq)[0]

		if result.index != INVALID_INDEX && result.Expire.After(now) {
			// 只要活着,就留在优先级队列中,等待分配任务
			//			log.Println("Find Valid Worker...")

			result.priority -= 1

			// 调整Worker的优先级
			heap.Fix(pq, result.index)

			return result
		} else {
			if result.index != INVALID_INDEX {
				log.Errorf("Invalid Item index in PriorityQueue#NextWorker")
			} else {
				log.Println("Worker Expired")
				// 只有过期的元素才删除
				heap.Remove(pq, result.index)
			}
		}
	}

	log.Println("Has Not Worker...")
	return nil

}
Exemple #2
0
// 创建一个BackService
func NewBackService(serviceName string, poller *zmq.Poller, topo *zk.Topology) *BackService {

	backSockets := NewBackSockets(poller)

	service := &BackService{
		ServiceName: serviceName,
		backend:     backSockets,
		poller:      poller,
		topo:        topo,
	}

	var evtbus chan interface{} = make(chan interface{}, 2)
	servicePath := topo.ProductServicePath(serviceName)
	endpoints, err := topo.WatchChildren(servicePath, evtbus)
	if err != nil {
		log.Println("Error: ", err)
		panic("Reading Service List Failed: ")
	}

	go func() {
		for true {
			// 如何监听endpoints的变化呢?
			addrSet := make(map[string]bool)
			nowStr := time.Now().Format("@2006-01-02 15:04:05")
			for _, endpoint := range endpoints {
				// 这些endpoint变化该如何处理呢?
				log.Println(utils.Green("---->Find Endpoint: "), endpoint, "For Service: ", serviceName)
				endpointInfo, _ := topo.GetServiceEndPoint(serviceName, endpoint)

				addr, ok := endpointInfo["frontend"]
				if ok {
					addrStr := addr.(string)
					log.Println(utils.Green("---->Add endpoint to backend: "), addrStr, nowStr, "For Service: ", serviceName)
					addrSet[addrStr] = true
				}
			}

			service.backend.UpdateEndpointAddrs(addrSet)

			// 等待事件
			<-evtbus
			// 读取数据,继续监听
			endpoints, err = topo.WatchChildren(servicePath, evtbus)
		}
	}()

	ticker := time.NewTicker(time.Millisecond * 1000)
	go func() {
		for _ = range ticker.C {
			service.backend.PurgeEndpoints()
		}
	}()

	return service

}
Exemple #3
0
//
// 删除Service Endpoint
//
func (s *ServiceEndpoint) DeleteServiceEndpoint(top *zk.Topology) {
	path := top.ProductServiceEndPointPath(s.Service, s.ServiceId)
	if ok, _ := top.Exist(path); ok {
		zkhelper.DeleteRecursive(top.ZkConn, path, -1)
		log.Println(Red("DeleteServiceEndpoint"), "Path: ", path)
	}
}
Exemple #4
0
func NewBackServices(poller *zmq.Poller, productName string, topo *zk.Topology) *BackServices {

	// 创建BackServices
	result := &BackServices{
		Services:        make(map[string]*BackService),
		OfflineServices: make(map[string]*BackService),
		poller:          poller,
		topo:            topo,
	}

	var evtbus chan interface{} = make(chan interface{}, 2)
	servicesPath := topo.ProductServicesPath()
	path, e1 := topo.CreateDir(servicesPath) // 保证Service目录存在,否则会报错
	fmt.Println("Path: ", path, "error: ", e1)
	services, err := topo.WatchChildren(servicesPath, evtbus)
	if err != nil {
		log.Println("Error: ", err)
		// TODO: 这个地方需要优化
		panic("Reading Service List Failed")
	}

	go func() {
		for true {

			result.Lock()
			for _, service := range services {
				log.Println("Service: ", service)
				if _, ok := result.Services[service]; !ok {
					result.addBackService(service)
				}
			}
			result.Unlock()

			// 等待事件
			<-evtbus
			// 读取数据,继续监听(连接过期了就过期了,再次Watch即可)
			services, err = topo.WatchChildren(servicesPath, evtbus)
		}
	}()

	// 读取zk, 等待
	log.Println("ProductName: ", result.topo.ProductName)

	return result
}
Exemple #5
0
// 创建指定的Path
func (top *Topology) CreateDir(path string) (string, error) {
	dir := top.FullPath(path)
	if ok, _ := top.Exist(dir); ok {
		log.Println("Path Exists")
		return dir, nil
	} else {
		return zkhelper.CreateRecursive(top.ZkConn, dir, "", 0, zkhelper.DefaultDirACLs())
	}
}
Exemple #6
0
//
// 将消息发送到Backend上去
//
func (s *BackService) HandleRequest(client_id string, msgs []string) (total int, err error, msg *[]byte) {

	backSocket := s.backend.NextSocket()
	if backSocket == nil {
		// 没有后端服务

		if config.VERBOSE {
			log.Println(utils.Red("No BackSocket Found for service:"), s.ServiceName)
		}
		errMsg := GetWorkerNotFoundData(s.ServiceName, 0)
		return 0, nil, &errMsg
	} else {
		if config.VERBOSE {
			log.Println("SendMessage With: ", backSocket.Addr, "For Service: ", s.ServiceName)
		}
		total, err = backSocket.SendMessage("", client_id, "", msgs)
		return total, err, nil
	}
}
Exemple #7
0
// 在第一次使用时再连接
func (p *BackSocket) connect() error {
	var err error
	p.Socket, err = zmq.NewSocket(zmq.DEALER)
	if err == nil {
		// 这个Id存在问题:
		socketSeq += 1
		p.Socket.SetIdentity(fmt.Sprintf("proxy-%d-%d", os.Getpid(), socketSeq))

		p.Socket.Connect(p.Addr)
		// 都只看数据的输入
		// 数据的输出经过异步处理,不用考虑时间的问题
		p.poller.Add(p.Socket, zmq.POLLIN)
		log.Println("Socket Create Succeed")
		return nil
	} else {
		log.Println("Socket Create Failed: ", err)
		return err
	}
}
Exemple #8
0
func (p *BackSocket) SendMessage(parts ...interface{}) (total int, err error) {
	if p.Socket == nil {
		err := p.connect()
		if err != nil {
			log.Println("Socket Connect Failed")
			return 0, err
		}
	}

	return p.Socket.SendMessage(parts...)
}
Exemple #9
0
//
// 设置RPC Proxy的数据:
//     绑定的前端的ip/port, 例如: {"rpc_front": "tcp://127.0.0.1:5550"}
//
func (top *Topology) SetRpcProxyData(proxyInfo map[string]interface{}) error {
	path := top.FullPath("/rpc_proxy")
	data, err := json.Marshal(proxyInfo)
	if err != nil {
		return err
	}

	// topo.FlagEphemeral 这里的ProxyInfo是手动配置的,需要持久化
	path, err = CreateOrUpdate(top.ZkConn, path, string(data), 0, zkhelper.DefaultDirACLs(), true)
	log.Println(green("SetRpcProxyData"), "Path: ", path, ", Error: ", err, ", Data: ", string(data))
	return err
}
Exemple #10
0
func (pq *PPQueue) PurgeExpired() {
	now := time.Now()
	expiredWokers := make([]*Worker, 0)
	// 给workerQueue中的所有的worker发送心跳消息
	for _, worker := range pq.WorkerQueue {
		if worker.Expire.Before(now) {
			fmt.Println("Purge Worker: ", worker.Identity, ", At Index: ", worker.index)
			expiredWokers = append(expiredWokers, worker)
		}
	}

	log.Println("expiredWokers: ", len(expiredWokers))

	// 删除过期的Worker
	for _, worker := range expiredWokers {
		log.Println("Purge Worker: ", worker.Identity, ", At Index: ", worker.index)
		heap.Remove(&(pq.WorkerQueue), worker.index)
		delete(pq.id2item, worker.Identity)
	}

	log.Println("Available Workers: ", green(fmt.Sprintf("%d", len(pq.WorkerQueue))))
}
//
// 将消息发送到Backend上去
//
func (s *BackService) HandleRequest(req *Request) (err error) {
	backendConn := s.NextBackendConn()

	s.lastRequestTime.Set(time.Now().Unix())

	if backendConn == nil {
		// 没有后端服务
		if s.verbose {
			log.Println(Red("No BackSocket Found for service:"), s.serviceName)
		}
		// 从errMsg来构建异常
		errMsg := GetWorkerNotFoundData(req, "BackService")
		req.Response.Data = errMsg

		return nil
	} else {
		if s.verbose {
			log.Println("SendMessage With: ", backendConn.Addr(), "For Service: ", s.serviceName)
		}
		backendConn.PushBack(req)
		return nil
	}
}
Exemple #12
0
func (conf *Config) getFrontendAddr() string {
	var frontendAddr = ""
	// 如果没有指定FrontHost, 则自动根据 IpPrefix来进行筛选,
	// 例如: IpPrefix: 10., 那么最终内网IP: 10.4.10.2之类的被选中
	if conf.FrontHost == "" {
		log.Println("FrontHost: ", conf.FrontHost, ", Prefix: ", conf.IpPrefix)
		if conf.IpPrefix != "" {
			conf.FrontHost = GetIpWithPrefix(conf.IpPrefix)
		}
	}
	if conf.FrontPort != "" && conf.FrontHost != "" {
		frontendAddr = fmt.Sprintf("tcp://%s:%s", conf.FrontHost, conf.FrontPort)
	}
	return frontendAddr
}
Exemple #13
0
//
// 读取RPC Proxy的数据:
//     绑定的前端的ip/port, 例如: {"rpc_front": "tcp://127.0.0.1:5550"}
//
func (top *Topology) GetRpcProxyData() (proxyInfo map[string]interface{}, e error) {
	path := top.FullPath("/rpc_proxy")
	data, _, err := top.ZkConn.Get(path)

	log.Println("Data: ", data, ", err: ", err)
	if err != nil {
		return nil, err
	}
	proxyInfo = make(map[string]interface{})
	err = json.Unmarshal(data, &proxyInfo)
	if err != nil {
		return nil, err
	} else {
		return proxyInfo, nil
	}
}
Exemple #14
0
//
// 将不在: addrSet中的endPoint标记为下线
//
func (p *BackSockets) UpdateEndpointAddrs(addrSet map[string]bool) {
	p.Lock()
	defer p.Unlock()

	var addr string
	for addr, _ = range addrSet {
		p.addEndpoint(addr)
	}

	now := time.Now().Format("@2006-01-02 15:04:05")
	for i := 0; i < p.Active; i++ {
		if _, ok := addrSet[p.Sockets[i].Addr]; !ok {
			log.Println(utils.Red("MarkEndpointsOffline#Mark Backend Offline: "), p.Sockets[i].Addr, now)

			p.markOffline(p.Sockets[i])
			i--
		}
	}
}
Exemple #15
0
//
// 通过参数依赖,保证getFrontendAddr的调用位置(必须等待Host, IpPrefix, Port读取完毕之后)
//
func (conf *Config) getFrontendAddr(frontHost, ipPrefix, frontPort string) string {
	if conf.FrontSock != "" {
		return conf.FrontSock
	}

	var frontendAddr = ""
	// 如果没有指定FrontHost, 则自动根据 IpPrefix来进行筛选,
	// 例如: IpPrefix: 10., 那么最终内网IP: 10.4.10.2之类的被选中
	if frontHost == "" {
		log.Println("FrontHost: ", frontHost, ", Prefix: ", ipPrefix)
		if ipPrefix != "" {
			frontHost = GetIpWithPrefix(ipPrefix)
		}
	}
	if frontPort != "" && frontHost != "" {
		frontendAddr = fmt.Sprintf("%s:%s", frontHost, frontPort)
	}
	return frontendAddr
}
Exemple #16
0
//
// 注册一个服务的Endpoints
//
func (s *ServiceEndpoint) AddServiceEndpoint(topo *zk.Topology) error {
	path := topo.ProductServiceEndPointPath(s.Service, s.ServiceId)
	data, err := json.Marshal(s)
	if err != nil {
		return err
	}

	// 创建Service(XXX: Service本身不包含数据)
	zk.CreateRecursive(topo.ZkConn, os_path.Dir(path), "", 0, zkhelper.DefaultDirACLs())

	// 当前的Session挂了,服务就下线
	// topo.FlagEphemeral

	// 参考: https://www.box.com/blog/a-gotcha-when-using-zookeeper-ephemeral-nodes/
	// 如果之前的Session信息还存在,则先删除;然后再添加
	topo.ZkConn.Delete(path, -1)
	var pathCreated string
	pathCreated, err = topo.ZkConn.Create(path, []byte(data), int32(zookeeper.FlagEphemeral), zkhelper.DefaultFileACLs())

	log.Println(Green("AddServiceEndpoint"), "Path: ", pathCreated, ", Error: ", err)
	return err
}
Exemple #17
0
//
// 注册一个服务的Endpoints
//
func (top *Topology) AddServiceEndPoint(service string, endpoint string, endpointInfo map[string]interface{}) error {
	path := top.ProductServiceEndPointPath(service, endpoint)
	data, err := json.Marshal(endpointInfo)
	if err != nil {
		return err
	}

	// 创建Service(XXX: Service本身不包含数据)
	CreateRecursive(top.zkConn, os_path.Dir(path), "", 0, zkhelper.DefaultDirACLs())

	// 当前的Session挂了,服务就下线
	// topo.FlagEphemeral

	// 参考: https://www.box.com/blog/a-gotcha-when-using-zookeeper-ephemeral-nodes/
	// 如果之前的Session信息还存在,则先删除;然后再添加
	top.zkConn.Delete(path, -1)
	var pathCreated string
	pathCreated, err = top.zkConn.Create(path, []byte(data), int32(topo.FlagEphemeral), zkhelper.DefaultFileACLs())

	log.Println(green("SetRpcProxyData"), "Path: ", pathCreated, ", Error: ", err)
	return err
}
Exemple #18
0
//
// 删除过期的Endpoints
//
func (p *BackSockets) PurgeEndpoints() {
	// 没有需要删除的对象
	if p.Active == len(p.Sockets) {
		return
	}

	log.Printf(utils.Green("PurgeEndpoints %d vs. %d"), p.Active, len(p.Sockets))

	p.Lock()
	defer p.Unlock()

	now := time.Now().Unix()
	nowStr := time.Now().Format("@2006-01-02 15:04:05")

	for i := p.Active; i < len(p.Sockets); i++ {
		// 逐步删除过期的Sockets
		current := p.Sockets[i]
		lastIndex := len(p.Sockets) - 1
		if now-current.markedOfflineTime > 5 {

			// 将i和最后一个元素交换
			p.swap(current, p.Sockets[lastIndex])

			// 关闭
			// current
			// 关闭旧的Socket
			log.Println(utils.Red("PurgeEndpoints#Purge Old Socket: "), current.Addr, nowStr)
			// 由Socket自己维护自己的状态
			// current.Socket.Close()

			p.Sockets[lastIndex] = nil
			p.Sockets = p.Sockets[0:lastIndex]

			i-- // 保持原位
		}

	}
}
Exemple #19
0
//
// 两参数是必须的:  ProductName, zkAddress, frontAddr可以用来测试
//
func mainBody(productName string, frontAddr string, zkAdresses string) {
	// 1. 创建到zk的连接
	var topo *zk.Topology
	topo = zk.NewTopology(productName, zkAdresses)

	// 3. 读取后端服务的配置
	poller := zmq.NewPoller()
	backServices := proxy.NewBackServices(poller, productName, topo)

	// 4. 创建前端服务
	frontend, _ := zmq.NewSocket(zmq.ROUTER)
	defer frontend.Close()

	// ROUTER/ROUTER绑定到指定的端口
	log.Println("---->Bind: ", magenta(frontAddr))
	frontend.Bind(frontAddr) //  For clients

	// 开始监听前端服务
	poller.Add(frontend, zmq.POLLIN)

	for {
		var sockets []zmq.Polled
		var err error

		sockets, err = poller.Poll(HEARTBEAT_INTERVAL)

		if err != nil {
			log.Println("Encounter Errors, Services Stoped: ", err)
			continue
		}

		for _, socket := range sockets {
			switch socket.Socket {

			case frontend:
				if config.VERBOSE {
					log.Println("----->Message from front: ")
				}
				msgs, err := frontend.RecvMessage(0)

				if err != nil {
					continue //  Interrupted
				}
				var service string
				var client_id string

				utils.PrintZeromqMsgs(msgs, "ProxyFrontEnd")

				// msg格式: <client_id, '', service,  '', other_msgs>
				client_id, msgs = utils.Unwrap(msgs)
				service, msgs = utils.Unwrap(msgs)

				//				log.Println("Client_id: ", client_id, ", Service: ", service)

				backService := backServices.GetBackService(service)

				if backService == nil {
					log.Println("BackService Not Found...")
					// 最后一个msg为Thrift编码后的消息
					thriftMsg := msgs[len(msgs)-1]
					// XXX: seqId如果不需要,也可以使用固定的数字
					_, _, seqId, _ := proxy.ParseThriftMsgBegin([]byte(thriftMsg))
					errMsg := proxy.GetServiceNotFoundData(service, seqId)

					// <client_id, "", errMsg>
					if len(msgs) > 1 {
						frontend.SendMessage(client_id, "", msgs[0:len(msgs)-1], errMsg)
					} else {
						frontend.SendMessage(client_id, "", errMsg)
					}

				} else {
					// <"", client_id, "", msgs>
					if config.PROFILE {
						lastMsg := msgs[len(msgs)-1]
						msgs = msgs[0 : len(msgs)-1]
						msgs = append(msgs, fmt.Sprintf("%.4f", float64(time.Now().UnixNano())*1e-9), "", lastMsg)
						if config.VERBOSE {
							log.Println(printList(msgs))
						}
					}
					total, err, errMsg := backService.HandleRequest(client_id, msgs)
					if errMsg != nil {
						if config.VERBOSE {
							log.Println("backService Error for service: ", service)
						}
						if len(msgs) > 1 {
							frontend.SendMessage(client_id, "", msgs[0:len(msgs)-1], *errMsg)
						} else {
							frontend.SendMessage(client_id, "", *errMsg)
						}
					} else if err != nil {
						log.Println(utils.Red("backService.HandleRequest Error: "), err, ", Total: ", total)
					}
				}
			default:
				// 除了来自前端的数据,其他的都来自后端
				msgs, err := socket.Socket.RecvMessage(0)
				if err != nil {
					log.Println("Encounter Errors When receiving from background")
					continue //  Interrupted
				}
				if config.VERBOSE {
					utils.PrintZeromqMsgs(msgs, "proxy")
				}

				msgs = utils.TrimLeftEmptyMsg(msgs)

				// msgs格式: <client_id, "", rpc_data>
				//          <control_msg_rpc_data>
				if len(msgs) == 1 {
					// 告知后端的服务可能有问题

				} else {
					if config.PROFILE {
						lastMsg := msgs[len(msgs)-1]
						msgs = msgs[0 : len(msgs)-1]
						msgs = append(msgs, fmt.Sprintf("%.4f", float64(time.Now().UnixNano())*1e-9), "", lastMsg)
					}
					if config.VERBOSE {
						log.Println(printList(msgs))
					}
					frontend.SendMessage(msgs)
				}
			}
		}
	}
}
Exemple #20
0
//
// Load Balance如何运维呢?
// 1. 在服务提供方,会会启动Load Balance, 它只负责本机器的某个指定服务的lb
// 2. 正常情况下,不能被轻易杀死
// 3. 需要考虑 graceful stop, 在死之前告知所有的proxy,如何告知呢? TODO
//
//
func main() {
	args, err := docopt.Parse(usage, nil, true, "Chunyu RPC Load Balance v0.1", true)
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	var maxFileFrag = 2
	var maxFragSize int64 = bytesize.GB * 1
	if s, ok := args["--log-filesize"].(string); ok && s != "" {
		v, err := bytesize.Parse(s)
		if err != nil {
			log.PanicErrorf(err, "invalid max log file size = %s", s)
		}
		maxFragSize = v
	}

	// set output log file
	if s, ok := args["-L"].(string); ok && s != "" {
		f, err := log.NewRollingFile(s, maxFileFrag, maxFragSize)
		if err != nil {
			log.PanicErrorf(err, "open rolling log file failed: %s", s)
		} else {
			defer f.Close()
			log.StdLog = log.New(f, "")
		}
	}
	log.SetLevel(log.LEVEL_INFO)
	log.SetFlags(log.Flags() | log.Lshortfile)

	// set log level
	if s, ok := args["--log-level"].(string); ok && s != "" {
		setLogLevel(s)
	}
	var backendAddr, frontendAddr, zkAddr, productName, serviceName string

	// set config file
	if args["-c"] != nil {
		configFile := args["-c"].(string)
		conf, err := utils.LoadConf(configFile)
		if err != nil {
			log.PanicErrorf(err, "load config failed")
		}
		productName = conf.ProductName

		if conf.FrontHost == "" {
			fmt.Println("FrontHost: ", conf.FrontHost, ", Prefix: ", conf.IpPrefix)
			if conf.IpPrefix != "" {
				conf.FrontHost = utils.GetIpWithPrefix(conf.IpPrefix)
			}
		}
		if conf.FrontPort != "" && conf.FrontHost != "" {
			frontendAddr = fmt.Sprintf("tcp://%s:%s", conf.FrontHost, conf.FrontPort)
		}

		backendAddr = conf.BackAddr
		serviceName = conf.Service

		zkAddr = conf.ZkAddr
		config.VERBOSE = conf.Verbose

	} else {
		productName = ""
		zkAddr = ""
	}

	if s, ok := args["--product"].(string); ok && s != "" {
		productName = s
	} else if productName == "" {
		// 既没有config指定,也没有命令行指定,则报错
		log.PanicErrorf(err, "Invalid ProductName: %s", s)
	}

	if s, ok := args["--zk"].(string); ok && s != "" {
		zkAddr = s
	} else if zkAddr == "" {
		log.PanicErrorf(err, "Invalid zookeeper address: %s", s)
	}

	if s, ok := args["--service"].(string); ok && s != "" {
		serviceName = s
	} else if serviceName == "" {
		log.PanicErrorf(err, "Invalid ServiceName: %s", s)
	}

	if s, ok := args["--baddr"].(string); ok && s != "" {
		backendAddr = s
	} else if backendAddr == "" {
		log.PanicErrorf(err, "Invalid backend address: %s", s)
	}
	if s, ok := args["--faddr"].(string); ok && s != "" {
		frontendAddr = s
	} else if frontendAddr == "" {
		//
		log.PanicErrorf(err, "Invalid frontend address: %s", s)
	}

	// 正式的服务
	mainBody(zkAddr, productName, serviceName, frontendAddr, backendAddr)
}
Exemple #21
0
func mainBody(zkAddr string, productName string, serviceName string, frontendAddr string, backendAddr string) {
	// 1. 创建到zk的连接
	var topo *zk.Topology
	topo = zk.NewTopology(productName, zkAddr)

	// 2. 启动服务
	frontend, _ := zmq.NewSocket(zmq.ROUTER)
	backend, _ := zmq.NewSocket(zmq.ROUTER)
	defer frontend.Close()
	defer backend.Close()

	// ROUTER/ROUTER绑定到指定的端口

	// tcp://127.0.0.1:5555 --> tcp://127_0_0_1:5555
	lbServiceName := GetServiceIdentity(frontendAddr)

	frontend.SetIdentity(lbServiceName)
	frontend.Bind(frontendAddr) //  For clients "tcp://*:5555"
	backend.Bind(backendAddr)   //  For workers "tcp://*:5556"

	log.Printf("FrontAddr: %s, BackendAddr: %s\n", magenta(frontendAddr), magenta(backendAddr))

	// 后端的workers queue
	workersQueue := queue.NewPPQueue()

	// 心跳间隔1s
	heartbeat_at := time.Tick(HEARTBEAT_INTERVAL)

	poller1 := zmq.NewPoller()
	poller1.Add(backend, zmq.POLLIN)

	poller2 := zmq.NewPoller()
	// 前提:
	//     1. 当zeromq通知消息可读时,那么整个Message(所有的msg parts)都可读
	//	   2. 往zeromq写数据时,是异步的,因此也不存在block(除非数据量巨大)
	//
	poller2.Add(backend, zmq.POLLIN)
	poller2.Add(frontend, zmq.POLLIN)

	// 3. 注册zk
	var endpointInfo map[string]interface{} = make(map[string]interface{})
	endpointInfo["frontend"] = frontendAddr
	endpointInfo["backend"] = backendAddr

	topo.AddServiceEndPoint(serviceName, lbServiceName, endpointInfo)

	isAlive := true
	isAliveLock := &sync.RWMutex{}

	go func() {
		servicePath := topo.ProductServicePath(serviceName)
		evtbus := make(chan interface{})
		for true {
			// 只是为了监控状态
			_, err := topo.WatchNode(servicePath, evtbus)

			if err == nil {
				// 等待事件
				e := (<-evtbus).(topozk.Event)
				if e.State == topozk.StateExpired || e.Type == topozk.EventNotWatching {
					// Session过期了,则需要删除之前的数据,因为这个数据的Owner不是当前的Session
					topo.DeleteServiceEndPoint(serviceName, lbServiceName)
					topo.AddServiceEndPoint(serviceName, lbServiceName, endpointInfo)
				}
			} else {
				time.Sleep(time.Second)
			}

			isAliveLock.RLock()
			isAlive1 := isAlive
			isAliveLock.RUnlock()
			if !isAlive1 {
				break
			}

		}
	}()

	ch := make(chan os.Signal, 1)

	signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
	// syscall.SIGKILL
	// kill -9 pid
	// kill -s SIGKILL pid 还是留给运维吧
	//

	// 自动退出条件:
	//

	var suideTime time.Time

	for {
		var sockets []zmq.Polled
		var err error

		sockets, err = poller2.Poll(HEARTBEAT_INTERVAL)
		if err != nil {
			//			break //  Interrupted
			log.Errorf("Error When Pollling: %v\n", err)
			continue
		}

		hasValidMsg := false
		for _, socket := range sockets {
			switch socket.Socket {
			case backend:
				// 格式:
				// 后端:
				// 	             <"", proxy_id, "", client_id, "", rpc_data>
				// Backend Socket读取到的:
				//		<wokerid, "", proxy_id, "", client_id, "", rpc_data>
				//
				msgs, err := backend.RecvMessage(0)
				if err != nil {
					log.Errorf("Error When RecvMessage from background: %v\n", err)
					continue
				}
				if config.VERBOSE {
					// log.Println("Message from backend: ", msgs)
				}
				// 消息类型:
				// msgs: <worker_id, "", proxy_id, "", client_id, "", rpc_data>
				//       <worker_id, "", rpc_control_data>
				worker_id, msgs := utils.Unwrap(msgs)

				// rpc_control_data 控制信息
				// msgs: <rpc_control_data>
				if len(msgs) == 1 {
					// PPP_READY
					// PPP_HEARTBEAT
					controlMsg := msgs[0]

					// 碰到无效的信息,则直接跳过去
					if len(controlMsg) == 0 {
						continue
					}
					if config.VERBOSE {
						// log.Println("Got Message From Backend...")
					}

					if controlMsg[0] == PPP_READY || controlMsg[0] == PPP_HEARTBEAT {
						// 后端服务剩余的并发能力
						var concurrency int
						if len(controlMsg) >= 3 {
							concurrency = int(controlMsg[2])
						} else {
							concurrency = 1
						}
						if config.VERBOSE {
							// utils.PrintZeromqMsgs(msgs, "control msg")
						}

						force_update := controlMsg[0] == PPP_READY
						workersQueue.UpdateWorkerStatus(worker_id, concurrency, force_update)
					} else if controlMsg[0] == PPP_STOP {
						// 停止指定的后端服务
						workersQueue.UpdateWorkerStatus(worker_id, -1, true)
					} else {
						log.Errorf("Unexpected Control Message: %d", controlMsg[0])
					}
				} else {
					hasValidMsg = true
					// 将信息发送到前段服务, 如果前端服务挂了,则消息就丢失
					//					log.Println("Send Message to frontend")
					workersQueue.UpdateWorkerStatus(worker_id, 0, false)
					// msgs: <proxy_id, "", client_id, "", rpc_data>
					frontend.SendMessage(msgs)
				}
			case frontend:
				hasValidMsg = true
				log.Println("----->Message from front: ")
				msgs, err := frontend.RecvMessage(0)
				if err != nil {
					log.Errorf("Error when reading from frontend: %v\n", err)
					continue
				}

				// msgs:
				// <proxy_id, "", client_id, "", rpc_data>
				if config.VERBOSE {
					utils.PrintZeromqMsgs(msgs, "frontend")
				}
				msgs = utils.TrimLeftEmptyMsg(msgs)

				// 将msgs交给后端服务器
				worker := workersQueue.NextWorker()
				if worker != nil {
					if config.VERBOSE {
						log.Println("Send Msg to Backend worker: ", worker.Identity)
					}
					backend.SendMessage(worker.Identity, "", msgs)
				} else {
					// 怎么返回错误消息呢?
					if config.VERBOSE {
						log.Println("No backend worker found")
					}
					errMsg := proxy.GetWorkerNotFoundData("account", 0)

					// <proxy_id, "", client_id, "", rpc_data>
					frontend.SendMessage(msgs[0:(len(msgs)-1)], errMsg)
				}
			}
		}

		// 如果安排的suiside, 则需要处理 suiside的时间
		isAliveLock.RLock()
		isAlive1 := isAlive
		isAliveLock.RUnlock()

		if !isAlive1 {
			if hasValidMsg {
				suideTime = time.Now().Add(time.Second * 3)
			} else {
				if time.Now().After(suideTime) {
					log.Println(utils.Green("Load Balance Suiside Gracefully"))
					break
				}
			}
		}

		// 心跳同步
		select {
		case <-heartbeat_at:
			now := time.Now()

			// 给workerQueue中的所有的worker发送心跳消息
			for _, worker := range workersQueue.WorkerQueue {
				if worker.Expire.After(now) {
					//					log.Println("Sending Hb to Worker: ", worker.Identity)
					backend.SendMessage(worker.Identity, "", PPP_HEARTBEAT_STR)
				}
			}

			workersQueue.PurgeExpired()
		case sig := <-ch:
			isAliveLock.Lock()
			isAlive1 := isAlive
			isAlive = false
			isAliveLock.Unlock()

			if isAlive1 {
				// 准备退出(但是需要处理完毕手上的活)

				// 需要退出:
				topo.DeleteServiceEndPoint(serviceName, lbServiceName)

				if sig == syscall.SIGKILL {
					log.Println(utils.Red("Got Kill Signal, Return Directly"))
					break
				} else {
					suideTime = time.Now().Add(time.Second * 3)
					log.Println(utils.Red("Schedule to suicide at: "), suideTime.Format("@2006-01-02 15:04:05"))
				}
			}
		default:
		}
	}
}
Exemple #22
0
//
// Proxy关闭,则整个机器就OVER, 需要考虑将整个机器下线
// 因此Proxy需要设计的非常完美,不要轻易地被杀死,或自杀
//
func main() {
	// 解析输入参数
	args, err := docopt.Parse(usage, nil, true, "Chunyu RPC Local Proxy v0.1", true)
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}

	var maxFileFrag = 2
	var maxFragSize int64 = bytesize.GB * 1
	if s, ok := args["--log-filesize"].(string); ok && s != "" {
		v, err := bytesize.Parse(s)
		if err != nil {
			log.PanicErrorf(err, "invalid max log file size = %s", s)
		}
		maxFragSize = v
	}

	// set output log file
	if s, ok := args["-L"].(string); ok && s != "" {
		f, err := log.NewRollingFile(s, maxFileFrag, maxFragSize)
		if err != nil {
			log.PanicErrorf(err, "open rolling log file failed: %s", s)
		} else {
			defer f.Close()
			log.StdLog = log.New(f, "")
		}
	}
	log.SetLevel(log.LEVEL_INFO)
	log.SetFlags(log.Flags() | log.Lshortfile)

	// set log level
	if s, ok := args["--log-level"].(string); ok && s != "" {
		setLogLevel(s)
	}

	var zkAddr, frontAddr, productName string

	// 从config文件中读取数据
	if args["-c"] != nil {
		configFile := args["-c"].(string)
		conf, err := utils.LoadConf(configFile)
		if err != nil {
			log.PanicErrorf(err, "load config failed")
		}
		productName = conf.ProductName
		frontAddr = conf.ProxyAddr
		zkAddr = conf.ZkAddr
		config.VERBOSE = conf.Verbose
		config.PROFILE = conf.Profile
	} else {
		productName = ""
		zkAddr = ""
	}

	if s, ok := args["--product"].(string); ok && s != "" {
		productName = s
	} else if productName == "" {
		log.PanicErrorf(err, "Invalid ProductName: %s", s)
	}

	if s, ok := args["--zk"].(string); ok && s != "" {
		zkAddr = s
	} else if zkAddr == "" {
		log.PanicErrorf(err, "Invalid zookeeper address: %s", s)
	}

	if s, ok := args["--faddr"].(string); ok && s != "" {
		frontAddr = s
	} else if frontAddr == "" {
		log.PanicErrorf(err, "Invalid Proxy address: %s", s)
	}

	// 正式的服务
	mainBody(productName, frontAddr, zkAddr)
}
//
// go test github.com/wfxiang08/rpc_proxy/proxy -v -run "TestBackend"
//
func TestBackend(t *testing.T) {

	// 作为一个Server
	transport, err := thrift.NewTServerSocket("127.0.0.1:0")
	assert.NoError(t, err)
	err = transport.Open() // 打开Transport
	assert.NoError(t, err)

	defer transport.Close()

	err = transport.Listen() // 开始监听
	assert.NoError(t, err)

	addr := transport.Addr().String()

	fmt.Println("Addr: ", addr)

	var requestNum int32 = 10

	requests := make([]*Request, 0, requestNum)

	var i int32
	for i = 0; i < requestNum; i++ {
		buf := make([]byte, 100, 100)
		l := fakeData("Hello", thrift.CALL, i+1, buf[0:0])
		buf = buf[0:l]

		req := NewRequest(buf, false)

		req.Wait.Add(1) // 因为go routine可能还没有执行,代码就跑到最后面进行校验了

		assert.Equal(t, i+1, req.Request.SeqId, "Request SeqId是否靠谱")

		requests = append(requests, req)
	}

	go func() {
		// 客户端代码
		bc := NewBackendConn(addr, nil, "test", true)
		bc.currentSeqId = 10

		// 准备发送数据
		var i int32
		for i = 0; i < requestNum; i++ {
			fmt.Println("Sending Request to Backend Conn", i)
			bc.PushBack(requests[i])

			requests[i].Wait.Done()
		}

		// 需要等待数据返回?
		time.Sleep(time.Second * 2)

	}()

	go func() {
		// 服务器端代码
		tran, err := transport.Accept()
		if err != nil {
			log.ErrorErrorf(err, "Error: %v\n", err)
		}
		assert.NoError(t, err)

		bt := NewTBufferedFramedTransport(tran, time.Microsecond*100, 2)

		// 在当前的这个t上读写数据
		var i int32
		for i = 0; i < requestNum; i++ {
			request, err := bt.ReadFrame()
			assert.NoError(t, err)

			req := NewRequest(request, false)
			assert.Equal(t, req.Request.SeqId, i+10)
			fmt.Printf("Server Got Request, and SeqNum OK, Id: %d, Frame Size: %d\n", i, len(request))

			// 回写数据
			bt.Write(request)
			bt.FlushBuffer(true)

		}

		tran.Close()
	}()

	fmt.Println("Requests Len: ", len(requests))
	for idx, r := range requests {
		r.Wait.Wait()

		// r 原始的请求
		req := NewRequest(r.Response.Data, false)

		log.Printf(Green("SeqMatch[%d]: Orig: %d, Return: %d\n"), idx, req.Request.SeqId, r.Request.SeqId)
		assert.Equal(t, req.Request.SeqId, r.Request.SeqId)
	}
	log.Println("OK")
}
Exemple #24
0
func RpcMain(binaryName string, serviceDesc string, configCheck ConfigCheck,
	serverFactory ServerFactorory, buildDate string, gitVersion string) {

	// 1. 准备解析参数
	usage = fmt.Sprintf(usage, binaryName, binaryName)

	version := fmt.Sprintf("Version: %s\nBuildDate: %s\nDesc: %s\nAuthor: [email protected]", gitVersion, buildDate, serviceDesc)
	args, err := docopt.Parse(usage, nil, true, version, true)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	if s, ok := args["-V"].(bool); ok && s {
		fmt.Println(Green(version))
		os.Exit(1)
	}

	// 这就是为什么 Codis 傻乎乎起一个 http server的目的
	if s, ok := args["--profile-addr"].(string); ok && len(s) > 0 {
		go func() {
			log.Printf(Red("Profile Address: %s"), s)
			log.Println(http.ListenAndServe(s, nil))
		}()
	}

	// 2. 解析Log相关的配置
	log.SetLevel(log.LEVEL_INFO)

	var maxKeepDays int = 3
	if s, ok := args["--log-keep-days"].(string); ok && s != "" {
		v, err := strconv.ParseInt(s, 10, 32)
		if err != nil {
			log.PanicErrorf(err, "invalid max log file keep days = %s", s)
		}
		maxKeepDays = int(v)
	}

	// set output log file
	if s, ok := args["-L"].(string); ok && s != "" {
		f, err := log.NewRollingFile(s, maxKeepDays)
		if err != nil {
			log.PanicErrorf(err, "open rolling log file failed: %s", s)
		} else {
			defer f.Close()
			log.StdLog = log.New(f, "")
		}
	}
	log.SetLevel(log.LEVEL_INFO)
	log.SetFlags(log.Flags() | log.Lshortfile)

	// set log level
	if s, ok := args["--log-level"].(string); ok && s != "" {
		SetLogLevel(s)
	}

	// 没有就没有
	workDir, _ := args["--work-dir"].(string)
	codeUrlVersion, _ := args["--code-url-version"].(string)
	if len(workDir) == 0 {
		workDir, _ = os.Getwd()
	}

	log.Printf("WorkDir: %s, CodeUrl: %s, Wd: %s", workDir, codeUrlVersion)

	// 3. 解析Config
	configFile := args["-c"].(string)
	conf, err := utils.LoadConf(configFile)
	if err != nil {
		log.PanicErrorf(err, "load config failed")
	}

	// 额外的配置信息
	conf.WorkDir = workDir
	conf.CodeUrlVersion = codeUrlVersion

	if configCheck != nil {
		configCheck(conf)
	} else {
		log.Panic("No Config Check Given")
	}
	// 每次启动的时候都打印版本信息
	log.Infof(Green("-----------------\n%s\n--------------------------------------------------------------------"), version)

	// 启动服务
	server := serverFactory(conf)
	server.Run()
}