// Copyright 2016 The CMux Authors. All rights reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or // implied. See the License for the specific language governing // permissions and limitations under the License. package cmux_test import ( "fmt" "io" "log" "net" "net/http" "net/rpc" "strings" "google.golang.org/grpc" "golang.org/x/net/context" "golang.org/x/net/websocket" "github.com/soheilhy/cmux" grpchello "google.golang.org/grpc/examples/helloworld/helloworld" ) type exampleHTTPHandler struct{} func (h *exampleHTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "example http response") } func serveHTTP(l net.Listener) { s := &http.Server{ Handler: &exampleHTTPHandler{}, } if err := s.Serve(l); err != cmux.ErrListenerClosed { panic(err) } } func EchoServer(ws *websocket.Conn) { if _, err := io.Copy(ws, ws); err != nil { panic(err) } } func serveWS(l net.Listener) { s := &http.Server{ Handler: websocket.Handler(EchoServer), } if err := s.Serve(l); err != cmux.ErrListenerClosed { panic(err) } } type ExampleRPCRcvr struct{} func (r *ExampleRPCRcvr) Cube(i int, j *int) error { *j = i * i return nil } func serveRPC(l net.Listener) { s := rpc.NewServer() if err := s.Register(&ExampleRPCRcvr{}); err != nil { panic(err) } for { conn, err := l.Accept() if err != nil { if err != cmux.ErrListenerClosed { panic(err) } return } go s.ServeConn(conn) } } type grpcServer struct{} func (s *grpcServer) SayHello(ctx context.Context, in *grpchello.HelloRequest) ( *grpchello.HelloReply, error) { return &grpchello.HelloReply{Message: "Hello " + in.Name + " from cmux"}, nil } func serveGRPC(l net.Listener) { grpcs := grpc.NewServer() grpchello.RegisterGreeterServer(grpcs, &grpcServer{}) if err := grpcs.Serve(l); err != cmux.ErrListenerClosed { panic(err) } } func Example() { l, err := net.Listen("tcp", "127.0.0.1:50051") if err != nil { log.Panic(err) } m := cmux.New(l) // We first match the connection against HTTP2 fields. If matched, the // connection will be sent through the "grpcl" listener. grpcl := m.Match(cmux.HTTP2HeaderFieldPrefix("content-type", "application/grpc")) //Otherwise, we match it againts a websocket upgrade request. wsl := m.Match(cmux.HTTP1HeaderField("Upgrade", "websocket")) // Otherwise, we match it againts HTTP1 methods. If matched, // it is sent through the "httpl" listener. httpl := m.Match(cmux.HTTP1Fast()) // If not matched by HTTP, we assume it is an RPC connection. rpcl := m.Match(cmux.Any()) // Then we used the muxed listeners. go serveGRPC(grpcl) go serveWS(wsl) go serveHTTP(httpl) go serveRPC(rpcl) if err := m.Serve(); !strings.Contains(err.Error(), "use of closed network connection") { panic(err) } }