multiplexing cruft

client/rpc_client.go

@@ -108,7 +108,7 @@ func (r *rpcClient) call(ctx context.Context, node *registry.Node, req Request,
 
 	seq := atomic.LoadUint64(&r.seq)
 	atomic.AddUint64(&r.seq, 1)
-	codec := newRpcCodec(msg, c, cf)
+	codec := newRpcCodec(msg, c, cf, "")
 
 	rsp := &rpcResponse{
 		socket: c,
@@ -206,7 +206,13 @@ func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request
 		return nil, errors.InternalServerError("go.micro.client", "connection error: %v", err)
 	}
 
-	codec := newRpcCodec(msg, c, cf)
+	// increment the sequence number
+	seq := atomic.LoadUint64(&r.seq)
+	atomic.AddUint64(&r.seq, 1)
+	id := fmt.Sprintf("%v", seq)
+
+	// create codec with stream id
+	codec := newRpcCodec(msg, c, cf, id)
 
 	rsp := &rpcResponse{
 		socket: c,
@@ -224,6 +230,9 @@ func (r *rpcClient) stream(ctx context.Context, node *registry.Node, req Request
 		response: rsp,
 		closed:   make(chan bool),
 		codec:    codec,
+		id: id,
+		// signal the end of stream,
+		eos: true,
 	}
 
 	ch := make(chan error, 1)

client/rpc_codec.go

@@ -39,6 +39,9 @@ type rpcCodec struct {
 
 	req *transport.Message
 	buf *readWriteCloser
+
+	// signify if its a stream
+	stream string
 }
 
 type readWriteCloser struct {
@@ -113,7 +116,7 @@ func getHeaders(m *codec.Message) {
 	}
 }
 
-func setHeaders(m *codec.Message) {
+func setHeaders(m *codec.Message, stream string) {
 	set := func(hdr, v string) {
 		if len(v) == 0 {
 			return
@@ -127,6 +130,10 @@ func setHeaders(m *codec.Message) {
 	set("Micro-Method", m.Method)
 	set("Micro-Endpoint", m.Endpoint)
 	set("Micro-Error", m.Error)
+
+	if len(stream) > 0 {
+		set("Micro-Stream", stream)
+	}
 }
 
 // setupProtocol sets up the old protocol
@@ -150,7 +157,7 @@ func setupProtocol(msg *transport.Message, node *registry.Node) codec.NewCodec {
 	return defaultCodecs[msg.Header["Content-Type"]]
 }
 
-func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCodec) codec.Codec {
+func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCodec, stream string) codec.Codec {
 	rwc := &readWriteCloser{
 		wbuf: bytes.NewBuffer(nil),
 		rbuf: bytes.NewBuffer(nil),
@@ -160,6 +167,7 @@ func newRpcCodec(req *transport.Message, client transport.Client, c codec.NewCod
 		client: client,
 		codec:  c(rwc),
 		req:    req,
+		stream: stream,
 	}
 	return r
 }
@@ -178,7 +186,7 @@ func (c *rpcCodec) Write(m *codec.Message, body interface{}) error {
 	}
 
 	// set the mucp headers
-	setHeaders(m)
+	setHeaders(m, c.stream)
 
 	// if body is bytes Frame don't encode
 	if body != nil {

client/rpc_stream.go

@@ -18,6 +18,9 @@ type rpcStream struct {
 	response Response
 	codec    codec.Codec
 	context  context.Context
+
+	// signal whether we should send EOS
+	eos bool
 }
 
 func (r *rpcStream) isClosed() bool {
@@ -120,6 +123,20 @@ func (r *rpcStream) Close() error {
 		return nil
 	default:
 		close(r.closed)
+
+		// send the end of stream message
+		if r.eos {
+			// no need to check for error
+			r.codec.Write(&codec.Message{
+				Id:       r.id,
+				Target:   r.request.Service(),
+				Method:   r.request.Method(),
+				Endpoint: r.request.Endpoint(),
+				Type:     codec.Error,
+				Error: lastStreamResponseError,
+			}, nil)
+		}
+
 		return r.codec.Close()
 	}
 }

server/rpc_codec.go

@@ -158,7 +158,6 @@ func newRpcCodec(req *transport.Message, socket transport.Socket, c codec.NewCod
 		wbuf: bytes.NewBuffer(nil),
 	}
 	r := &rpcCodec{
-		first:  true,
 		buf:    rwc,
 		codec:  c(rwc),
 		req:    req,
@@ -174,8 +173,6 @@ func (c *rpcCodec) ReadHeader(r *codec.Message, t codec.MessageType) error {
 		Body:   c.req.Body,
 	}
 
-	// if its a follow on request read it
-	if !c.first {
 	var tm transport.Message
 
 	// read off the socket
@@ -197,10 +194,6 @@ func (c *rpcCodec) ReadHeader(r *codec.Message, t codec.MessageType) error {
 
 	// set req
 	c.req = &tm
-	}
-
-	// no longer first read
-	c.first = false
 
 	// set some internal things
 	getHeaders(&m)

server/rpc_server.go

@@ -19,6 +19,7 @@ import (
 	"github.com/micro/go-micro/util/addr"
 	log "github.com/micro/go-micro/util/log"
 	mnet "github.com/micro/go-micro/util/net"
+	"github.com/micro/go-micro/util/socket"
 )
 
 type rpcServer struct {
@@ -70,23 +71,108 @@ func (s *rpcServer) ServeConn(sock transport.Socket) {
 		}
 	}()
 
+	// multiplex the streams on a single socket by Micro-Stream
+	var mtx sync.RWMutex
+	sockets := make(map[string]*socket.Socket)
+
+	log.Info("New socket")
+
 	for {
 		var msg transport.Message
 		if err := sock.Recv(&msg); err != nil {
 			return
 		}
 
+		// use Micro-Id as the stream identifier
+		// in the event its blank we'll always process
+		// on the same socket
+		id := msg.Header["Micro-Stream"]
+
+		// if there's no stream id then its a standard request
+		if len(id) == 0 {
+			id = msg.Header["Micro-Id"]
+		}
+
 		// add to wait group if "wait" is opt-in
 		if s.wg != nil {
 			s.wg.Add(1)
 		}
 
+		// check we have an existing socket
+		mtx.RLock()
+		psock, ok := sockets[id]
+		mtx.RUnlock()
+
+		log.Infof("Got socket %v %v", id, ok)
+
+		// got the socket
+		if ok {
+			// accept the message
+			if err := psock.Accept(&msg); err != nil {
+				log.Infof("Accept Error %+v", err)
+				// close the socket
+				psock.Close()
+
+				// delete the socket
+				mtx.Lock()
+				delete(sockets, id)
+				mtx.Unlock()
+			}
+
+			// done(1)
+			if s.wg != nil {
+				s.wg.Done()
+			}
+
+			// continue to the next message
+			continue
+		}
+
+		// no socket was found
+		psock = socket.New()
+		psock.SetLocal(sock.Local())
+		psock.SetRemote(sock.Remote())
+
+		// load the socket
+		psock.Accept(&msg)
+
+		// save a new socket
+		mtx.Lock()
+		sockets[id] = psock
+		mtx.Unlock()
+
+		// process the outbound messages from the socket
+		go func(id string, psock *socket.Socket) {
+			defer psock.Close()
+
+			for {
+				// get the message from our internal handler/stream
+				m := new(transport.Message)
+				if err := psock.Process(m); err != nil {
+					log.Infof("Process Error %+v", err)
+
+					// delete the socket
+					mtx.Lock()
+					delete(sockets, id)
+					mtx.Unlock()
+					return
+				}
+
+				// send the message back over the socket
+				if err := sock.Send(m); err != nil {
+					return
+				}
+			}
+		}(id, psock)
+
+		// now walk the usual path
+
 		// we use this Timeout header to set a server deadline
 		to := msg.Header["Timeout"]
 		// we use this Content-Type header to identify the codec needed
 		ct := msg.Header["Content-Type"]
 
-		// strip our headers
+		// copy the message headers
 		hdr := make(map[string]string)
 		for k, v := range msg.Header {
 			hdr[k] = v
@@ -96,17 +182,17 @@ func (s *rpcServer) ServeConn(sock transport.Socket) {
 		hdr["Local"] = sock.Local()
 		hdr["Remote"] = sock.Remote()
 
-		// create new context
+		// create new context with the metadata
 		ctx := metadata.NewContext(context.Background(), hdr)
 
-		// set the timeout if we have it
+		// set the timeout from the header if we have it
 		if len(to) > 0 {
 			if n, err := strconv.ParseUint(to, 10, 64); err == nil {
 				ctx, _ = context.WithTimeout(ctx, time.Duration(n))
 			}
 		}
 
-		// no content type
+		// if there's no content type default it
 		if len(ct) == 0 {
 			msg.Header["Content-Type"] = DefaultContentType
 			ct = DefaultContentType
@@ -133,7 +219,13 @@ func (s *rpcServer) ServeConn(sock transport.Socket) {
 			}
 		}
 
-		rcodec := newRpcCodec(&msg, sock, cf)
+		rcodec := newRpcCodec(&msg, psock, cf)
+
+		// check stream id
+		var stream bool
+		if v := getHeader("Micro-Stream", msg.Header); len(v) > 0 {
+			stream = true
+		}
 
 		// internal request
 		request := &rpcRequest{
@@ -144,15 +236,14 @@ func (s *rpcServer) ServeConn(sock transport.Socket) {
 			codec:       rcodec,
 			header:      msg.Header,
 			body:        msg.Body,
-			socket:      sock,
-			stream:      true,
-			first:       true,
+			socket:      psock,
+			stream:      stream,
 		}
 
 		// internal response
 		response := &rpcResponse{
 			header: make(map[string]string),
-			socket: sock,
+			socket: psock,
 			codec:  rcodec,
 		}
 
@@ -175,6 +266,8 @@ func (s *rpcServer) ServeConn(sock transport.Socket) {
 			r = rpcRouter{handler}
 		}
 
+		// serve the request in a go routine as this may be a stream
+		go func(id string, psock *socket.Socket) {
 			// serve the actual request using the request router
 			if err := r.ServeRequest(ctx, request, response); err != nil {
 				// write an error response
@@ -183,17 +276,26 @@ func (s *rpcServer) ServeConn(sock transport.Socket) {
 					Error:  err.Error(),
 					Type:   codec.Error,
 				}, nil)
+
 				// could not write the error response
 				if err != nil {
 					log.Logf("rpc: unable to write error response: %v", err)
 				}
+			}
+
+			mtx.Lock()
+			delete(sockets, id)
+			mtx.Unlock()
+
+			psock.Close()
+
+			// once done serving signal we're done
 			if s.wg != nil {
 				s.wg.Done()
 			}
-			return
-		}
+		}(id, psock)
 
-		// done
+		// signal we're done
 		if s.wg != nil {
 			s.wg.Done()
 		}

util/socket/socket.go

@@ -7,8 +7,8 @@ import (
 	"github.com/micro/go-micro/transport"
 )
 
-// socket is our pseudo socket for transport.Socket
-type socket struct {
+// Socket is our pseudo socket for transport.Socket
+type Socket struct {
 	// closed
 	closed chan bool
 	// remote addr
@@ -21,16 +21,16 @@ type socket struct {
 	recv chan *transport.Message
 }
 
-func (s *socket) SetLocal(l string) {
+func (s *Socket) SetLocal(l string) {
 	s.local = l
 }
 
-func (s *socket) SetRemote(r string) {
+func (s *Socket) SetRemote(r string) {
 	s.remote = r
 }
 
 // Accept passes a message to the socket which will be processed by the call to Recv
-func (s *socket) Accept(m *transport.Message) error {
+func (s *Socket) Accept(m *transport.Message) error {
 	select {
 	case <-s.closed:
 		return io.EOF
@@ -41,7 +41,7 @@ func (s *socket) Accept(m *transport.Message) error {
 }
 
 // Process takes the next message off the send queue created by a call to Send
-func (s *socket) Process(m *transport.Message) error {
+func (s *Socket) Process(m *transport.Message) error {
 	select {
 	case <-s.closed:
 		return io.EOF
@@ -51,15 +51,15 @@ func (s *socket) Process(m *transport.Message) error {
 	return nil
 }
 
-func (s *socket) Remote() string {
+func (s *Socket) Remote() string {
 	return s.remote
 }
 
-func (s *socket) Local() string {
+func (s *Socket) Local() string {
 	return s.local
 }
 
-func (s *socket) Send(m *transport.Message) error {
+func (s *Socket) Send(m *transport.Message) error {
 	select {
 	case <-s.closed:
 		return io.EOF
@@ -70,13 +70,17 @@ func (s *socket) Send(m *transport.Message) error {
 	// make copy
 	msg := &transport.Message{
 		Header: make(map[string]string),
-		Body:   m.Body,
+		Body: make([]byte, len(m.Body)),
 	}
 
+	// copy headers
 	for k, v := range m.Header {
 		msg.Header[k] = v
 	}
 
+	// copy body
+	copy(msg.Body, m.Body)
+
 	// send a message
 	select {
 	case s.send <- msg:
@@ -87,7 +91,7 @@ func (s *socket) Send(m *transport.Message) error {
 	return nil
 }
 
-func (s *socket) Recv(m *transport.Message) error {
+func (s *Socket) Recv(m *transport.Message) error {
 	select {
 	case <-s.closed:
 		return io.EOF
@@ -109,7 +113,7 @@ func (s *socket) Recv(m *transport.Message) error {
 }
 
 // Close closes the socket
-func (s *socket) Close() error {
+func (s *Socket) Close() error {
 	select {
 	case <-s.closed:
 		// no op
@@ -119,11 +123,21 @@ func (s *socket) Close() error {
 	return nil
 }
 
+// Indicates its closed
+func (s *socket) Done() bool {
+	select {
+	case <-s.closed:
+		return true
+	default:
+		return false
+	}
+}
+
 // New returns a new pseudo socket which can be used in the place of a transport socket.
 // Messages are sent to the socket via Accept and receives from the socket via Process.
 // SetLocal/SetRemote should be called before using the socket.
-func New() *socket {
-	return &socket{
+func New() *Socket {
+	return &Socket{
 		closed: make(chan bool),
 		local:  "local",
 		remote: "remote",