Golang ProxyServer.Close方法代碼示例

// loop for sending messages from channel to frpc
func msgSender(s *server.ProxyServer, c *conn.Conn, msgSendChan chan interface{}) {
	for {
		msg, ok := <-msgSendChan
		if !ok {
			break
		}

		buf, _ := json.Marshal(msg)
		err := c.Write(string(buf) + "\n")
		if err != nil {
			log.Warn("ProxyName [%s], write to client error, proxy exit", s.Name)
			s.Close()
			break
		}
	}
}

// loop for reading messages from frpc after control connection is established
func msgReader(s *server.ProxyServer, c *conn.Conn, msgSendChan chan interface{}) error {
	// for heartbeat
	var heartbeatTimeout bool = false
	timer := time.AfterFunc(time.Duration(server.HeartBeatTimeout)*time.Second, func() {
		heartbeatTimeout = true
		s.Close()
		log.Error("ProxyName [%s], client heartbeat timeout", s.Name)
	})
	defer timer.Stop()

	for {
		buf, err := c.ReadLine()
		if err != nil {
			if err == io.EOF {
				log.Warn("ProxyName [%s], client is dead!", s.Name)
				return err
			} else if c == nil || c.IsClosed() {
				log.Warn("ProxyName [%s], client connection is closed", s.Name)
				return err
			}
			log.Warn("ProxyName [%s], read error: %v", s.Name, err)
			continue
		}

		cliReq := &msg.ControlReq{}
		if err := json.Unmarshal([]byte(buf), &cliReq); err != nil {
			log.Warn("ProxyName [%s], parse msg from frpc error: %v : %s", s.Name, err, buf)
			continue
		}

		switch cliReq.Type {
		case consts.HeartbeatReq:
			log.Debug("ProxyName [%s], get heartbeat", s.Name)
			timer.Reset(time.Duration(server.HeartBeatTimeout) * time.Second)
			heartbeatRes := &msg.ControlRes{
				Type: consts.HeartbeatRes,
			}
			msgSendChan <- heartbeatRes
		default:
			log.Warn("ProxyName [%s}, unsupport msgType [%d]", s.Name, cliReq.Type)
		}
	}
	return nil
}

// connection from every client and server
func controlWorker(c *conn.Conn) {
	// if login message type is NewWorkConn, don't close this connection
	var closeFlag bool = true
	var s *server.ProxyServer
	defer func() {
		if closeFlag {
			c.Close()
			if s != nil {
				s.Close()
			}
		}
	}()

	// get login message
	buf, err := c.ReadLine()
	if err != nil {
		log.Warn("Read error, %v", err)
		return
	}
	log.Debug("Get msg from frpc: %s", buf)

	cliReq := &msg.ControlReq{}
	if err := json.Unmarshal([]byte(buf), &cliReq); err != nil {
		log.Warn("Parse msg from frpc error: %v : %s", err, buf)
		return
	}

	// login when type is NewCtlConn or NewWorkConn
	ret, info := doLogin(cliReq, c)
	s, ok := server.ProxyServers[cliReq.ProxyName]
	if !ok {
		log.Warn("ProxyName [%s] is not exist", cliReq.ProxyName)
		return
	}
	// if login type is NewWorkConn, nothing will be send to frpc
	if cliReq.Type != consts.NewWorkConn {
		cliRes := &msg.ControlRes{
			Type: consts.NewCtlConnRes,
			Code: ret,
			Msg:  info,
		}
		byteBuf, _ := json.Marshal(cliRes)
		err = c.Write(string(byteBuf) + "\n")
		if err != nil {
			log.Warn("ProxyName [%s], write to client error, proxy exit", s.Name)
			time.Sleep(1 * time.Second)
			return
		}
	} else {
		closeFlag = false
		return
	}

	// if login failed, just return
	if ret > 0 {
		return
	}

	// create a channel for sending messages
	msgSendChan := make(chan interface{}, 1024)
	go msgSender(s, c, msgSendChan)
	go noticeUserConn(s, msgSendChan)

	// loop for reading control messages from frpc and deal with different types
	msgReader(s, c, msgSendChan)

	close(msgSendChan)
	log.Info("ProxyName [%s], I'm dead!", s.Name)
	return
}