Golang tcp.NewMux函數代碼示例

// Ensure two handlers cannot be registered for the same header byte.
func TestMux_Listen_ErrAlreadyRegistered(t *testing.T) {
	defer func() {
		if r := recover(); r != `listener already registered under header byte: 5` {
			t.Fatalf("unexpected recover: %#v", r)
		}
	}()

	// Register two listeners with the same header byte.
	mux := tcp.NewMux()
	mux.Listen(5)
	mux.Listen(5)
}

func newService(cfg *meta.Config) *testService {
	// Open shared TCP connection.
	ln, err := net.Listen("tcp", cfg.BindAddress)
	if err != nil {
		panic(err)
	}

	// Multiplex listener.
	mux := tcp.NewMux()

	s := meta.NewService(cfg)
	s.RaftListener = mux.Listen(meta.MuxHeader)

	go mux.Serve(ln)

	return &testService{Service: s, ln: ln}
}

func newTestWriteService(f func(shardID uint64, points []models.Point) error) testService {
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		panic(err)
	}

	mux := tcp.NewMux()
	muxln := mux.Listen(cluster.MuxHeader)
	go mux.Serve(ln)

	s := testService{
		ln:    ln,
		muxln: muxln,
	}
	s.TSDBStore.WriteToShardFn = f
	s.responses = make(chan *serviceResponse, 1024)
	return s
}

// MustOpenService returns a new, opened service. Panic on error.
func MustOpenService() *Service {
	// Open randomly assigned port.
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		panic(err)
	}

	// Start muxer.
	mux := tcp.NewMux()

	// Create new service and attach mux'd listener.
	s := NewService()
	s.ln = ln
	s.Listener = mux.Listen(copier.MuxHeader)
	go mux.Serve(ln)

	if err := s.Open(); err != nil {
		panic(err)
	}

	return s
}

// Open opens the meta and data store and all services.
func (s *Server) Open() error {
	// Start profiling, if set.
	startProfile(s.CPUProfile, s.MemProfile)

	// Open shared TCP connection.
	ln, err := net.Listen("tcp", s.BindAddress)
	if err != nil {
		return fmt.Errorf("listen: %s", err)
	}
	s.Listener = ln

	// Multiplex listener.
	mux := tcp.NewMux()
	go mux.Serve(ln)

	// Append services.
	s.appendMonitorService()
	s.appendPrecreatorService(s.config.Precreator)
	s.appendSnapshotterService()
	s.appendAdminService(s.config.Admin)
	s.appendContinuousQueryService(s.config.ContinuousQuery)
	s.appendHTTPDService(s.config.HTTPD)
	s.appendRetentionPolicyService(s.config.Retention)
	for _, i := range s.config.GraphiteInputs {
		if err := s.appendGraphiteService(i); err != nil {
			return err
		}
	}
	for _, i := range s.config.CollectdInputs {
		s.appendCollectdService(i)
	}
	for _, i := range s.config.OpenTSDBInputs {
		if err := s.appendOpenTSDBService(i); err != nil {
			return err
		}
	}
	for _, i := range s.config.UDPInputs {
		s.appendUDPService(i)
	}

	s.Subscriber.MetaClient = s.MetaClient
	s.Subscriber.MetaClient = s.MetaClient
	s.PointsWriter.MetaClient = s.MetaClient
	s.Monitor.MetaClient = s.MetaClient

	s.SnapshotterService.Listener = mux.Listen(snapshotter.MuxHeader)

	// Configure logging for all services and clients.
	if s.config.Meta.LoggingEnabled {
		s.MetaClient.WithLogger(s.Logger)
	}
	s.TSDBStore.WithLogger(s.Logger)
	if s.config.Data.QueryLogEnabled {
		s.QueryExecutor.WithLogger(s.Logger)
	}
	s.PointsWriter.WithLogger(s.Logger)
	s.Subscriber.WithLogger(s.Logger)
	for _, svc := range s.Services {
		svc.WithLogger(s.Logger)
	}
	s.SnapshotterService.WithLogger(s.Logger)
	s.Monitor.WithLogger(s.Logger)

	// Open TSDB store.
	if err := s.TSDBStore.Open(); err != nil {
		return fmt.Errorf("open tsdb store: %s", err)
	}

	// Open the subcriber service
	if err := s.Subscriber.Open(); err != nil {
		return fmt.Errorf("open subscriber: %s", err)
	}

	// Open the points writer service
	if err := s.PointsWriter.Open(); err != nil {
		return fmt.Errorf("open points writer: %s", err)
	}

	for _, service := range s.Services {
		if err := service.Open(); err != nil {
			return fmt.Errorf("open service: %s", err)
		}
	}

	// Start the reporting service, if not disabled.
	if !s.reportingDisabled {
		go s.startServerReporting()
	}

	return nil
}

// Open opens the meta and data store and all services.
func (s *Server) Open() error {
	// Start profiling, if set.
	startProfile(s.CPUProfile, s.MemProfile)

	// Open shared TCP connection.
	ln, err := net.Listen("tcp", s.BindAddress)
	if err != nil {
		return fmt.Errorf("listen: %s", err)
	}
	s.Listener = ln

	// Multiplex listener.
	mux := tcp.NewMux()
	go mux.Serve(ln)

	// Append services.
	s.appendClusterService(s.config.Cluster)
	s.appendPrecreatorService(s.config.Precreator)
	s.appendSnapshotterService()
	s.appendCopierService()
	s.appendAdminService(s.config.Admin)
	s.appendContinuousQueryService(s.config.ContinuousQuery)
	s.appendHTTPDService(s.config.HTTPD)
	s.appendCollectdService(s.config.Collectd)
	if err := s.appendOpenTSDBService(s.config.OpenTSDB); err != nil {
		return err
	}
	for _, g := range s.config.UDPs {
		s.appendUDPService(g)
	}
	s.appendRetentionPolicyService(s.config.Retention)
	for _, g := range s.config.Graphites {
		if err := s.appendGraphiteService(g); err != nil {
			return err
		}
	}

	s.Subscriber.MetaClient = s.MetaClient
	s.Subscriber.MetaClient = s.MetaClient
	s.PointsWriter.MetaClient = s.MetaClient
	s.Monitor.MetaClient = s.MetaClient

	s.ClusterService.Listener = mux.Listen(cluster.MuxHeader)
	s.SnapshotterService.Listener = mux.Listen(snapshotter.MuxHeader)
	s.CopierService.Listener = mux.Listen(copier.MuxHeader)

	// Open TSDB store.
	if err := s.TSDBStore.Open(); err != nil {
		return fmt.Errorf("open tsdb store: %s", err)
	}

	// Open the subcriber service
	if err := s.Subscriber.Open(); err != nil {
		return fmt.Errorf("open subscriber: %s", err)
	}

	// Open the points writer service
	if err := s.PointsWriter.Open(); err != nil {
		return fmt.Errorf("open points writer: %s", err)
	}

	// Open the monitor service
	if err := s.Monitor.Open(); err != nil {
		return fmt.Errorf("open monitor: %v", err)
	}

	for _, service := range s.Services {
		if err := service.Open(); err != nil {
			return fmt.Errorf("open service: %s", err)
		}
	}

	// Start the reporting service, if not disabled.
	if !s.reportingDisabled {
		go s.startServerReporting()
	}

	return nil
}

// Ensure the muxer can split a listener's connections across multiple listeners.
func TestMux(t *testing.T) {
	if err := quick.Check(func(n uint8, msg []byte) bool {
		if testing.Verbose() {
			if len(msg) == 0 {
				log.Printf("n=%d, <no message>", n)
			} else {
				log.Printf("n=%d, hdr=%d, len=%d", n, msg[0], len(msg))
			}
		}

		var wg sync.WaitGroup

		// Open single listener on random port.
		tcpListener, err := net.Listen("tcp", "127.0.0.1:0")
		if err != nil {
			t.Fatal(err)
		}
		defer tcpListener.Close()

		// Setup muxer & listeners.
		mux := tcp.NewMux()
		mux.Timeout = 200 * time.Millisecond
		if !testing.Verbose() {
			mux.Logger = log.New(ioutil.Discard, "", 0)
		}
		for i := uint8(0); i < n; i++ {
			ln := mux.Listen(byte(i))

			wg.Add(1)
			go func(i uint8, ln net.Listener) {
				defer wg.Done()

				// Wait for a connection for this listener.
				conn, err := ln.Accept()
				if conn != nil {
					defer conn.Close()
				}

				// If there is no message or the header byte
				// doesn't match then expect close.
				if len(msg) == 0 || msg[0] != byte(i) {
					if err == nil || err.Error() != "network connection closed" {
						t.Fatalf("unexpected error: %s", err)
					}
					return
				}

				// If the header byte matches this listener
				// then expect a connection and read the message.
				var buf bytes.Buffer
				if _, err := io.CopyN(&buf, conn, int64(len(msg)-1)); err != nil {
					t.Fatal(err)
				} else if !bytes.Equal(msg[1:], buf.Bytes()) {
					t.Fatalf("message mismatch:\n\nexp=%x\n\ngot=%x\n\n", msg[1:], buf.Bytes())
				}

				// Write response.
				if _, err := conn.Write([]byte("OK")); err != nil {
					t.Fatal(err)
				}
			}(i, ln)
		}

		// Begin serving from the listener.
		go mux.Serve(tcpListener)

		// Write message to TCP listener and read OK response.
		conn, err := net.Dial("tcp", tcpListener.Addr().String())
		if err != nil {
			t.Fatal(err)
		} else if _, err = conn.Write(msg); err != nil {
			t.Fatal(err)
		}

		// Read the response into the buffer.
		var resp [2]byte
		_, err = io.ReadFull(conn, resp[:])

		// If the message header is less than n then expect a response.
		// Otherwise we should get an EOF because the mux closed.
		if len(msg) > 0 && uint8(msg[0]) < n {
			if string(resp[:]) != `OK` {
				t.Fatalf("unexpected response: %s", resp[:])
			}
		} else {
			if err == nil || (err != io.EOF && !(strings.Contains(err.Error(), "connection reset by peer") ||
				strings.Contains(err.Error(), "closed by the remote host"))) {
				t.Fatalf("unexpected error: %s", err)
			}
		}

		// Close connection.
		if err := conn.Close(); err != nil {
			t.Fatal(err)
		}

		// Close original TCP listener and wait for all goroutines to close.
		tcpListener.Close()
		wg.Wait()
//.........這裏部分代碼省略.........

// Open opens the meta and data store and all services.
func (s *Server) Open() error {
	// Start profiling, if set.
	startProfile(s.CPUProfile, s.MemProfile)

	// Open shared TCP connection.
	ln, err := net.Listen("tcp", s.BindAddress)
	if err != nil {
		return fmt.Errorf("listen: %s", err)
	}
	s.Listener = ln

	// Multiplex listener.
	mux := tcp.NewMux()
	go mux.Serve(ln)

	if s.MetaService != nil {
		s.MetaService.RaftListener = mux.Listen(meta.MuxHeader)
		// Open meta service.
		if err := s.MetaService.Open(); err != nil {
			return fmt.Errorf("open meta service: %s", err)
		}
		go s.monitorErrorChan(s.MetaService.Err())
	}

	// initialize MetaClient.
	if err = s.initializeMetaClient(); err != nil {
		return err
	}

	if s.TSDBStore != nil {
		// Append services.
		s.appendClusterService(s.config.Cluster)
		s.appendPrecreatorService(s.config.Precreator)
		s.appendSnapshotterService()
		s.appendCopierService()
		s.appendAdminService(s.config.Admin)
		s.appendContinuousQueryService(s.config.ContinuousQuery)
		s.appendHTTPDService(s.config.HTTPD)
		s.appendCollectdService(s.config.Collectd)
		if err := s.appendOpenTSDBService(s.config.OpenTSDB); err != nil {
			return err
		}
		for _, g := range s.config.UDPs {
			s.appendUDPService(g)
		}
		s.appendRetentionPolicyService(s.config.Retention)
		for _, g := range s.config.Graphites {
			if err := s.appendGraphiteService(g); err != nil {
				return err
			}
		}

		s.QueryExecutor.Node = s.Node

		s.Subscriber.MetaClient = s.MetaClient
		s.ShardWriter.MetaClient = s.MetaClient
		s.HintedHandoff.MetaClient = s.MetaClient
		s.Subscriber.MetaClient = s.MetaClient
		s.PointsWriter.MetaClient = s.MetaClient
		s.Monitor.MetaClient = s.MetaClient

		s.ClusterService.Listener = mux.Listen(cluster.MuxHeader)
		s.SnapshotterService.Listener = mux.Listen(snapshotter.MuxHeader)
		s.CopierService.Listener = mux.Listen(copier.MuxHeader)

		// Open TSDB store.
		if err := s.TSDBStore.Open(); err != nil {
			// Provide helpful error if user needs to upgrade shards to
			// tsm1.
			if serr, ok := err.(tsdb.ShardError); ok && serr.Err == tsdb.ErrUnknownEngineFormat {
				return influxdb.ErrUpgradeEngine
			}
			return fmt.Errorf("open tsdb store: %s", err)
		}

		// Open the hinted handoff service
		if err := s.HintedHandoff.Open(); err != nil {
			return fmt.Errorf("open hinted handoff: %s", err)
		}

		// Open the subcriber service
		if err := s.Subscriber.Open(); err != nil {
			return fmt.Errorf("open subscriber: %s", err)
		}

		// Open the points writer service
		if err := s.PointsWriter.Open(); err != nil {
			return fmt.Errorf("open points writer: %s", err)
		}

		// Open the monitor service
		if err := s.Monitor.Open(); err != nil {
			return fmt.Errorf("open monitor: %v", err)
		}

		for _, service := range s.Services {
			if err := service.Open(); err != nil {
				return fmt.Errorf("open service: %s", err)
			}
//.........這裏部分代碼省略.........