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134 lines
3.1 KiB
134 lines
3.1 KiB
// Copyright 2016 The CMux Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package cmux_test
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import (
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"net/rpc"
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"strings"
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"golang.org/x/net/context"
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"golang.org/x/net/websocket"
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"google.golang.org/grpc"
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"google.golang.org/grpc/examples/helloworld/helloworld"
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"github.com/cockroachdb/cmux"
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)
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type exampleHTTPHandler struct{}
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func (h *exampleHTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "example http response")
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}
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func serveHTTP(l net.Listener) {
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s := &http.Server{
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Handler: &exampleHTTPHandler{},
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}
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if err := s.Serve(l); err != cmux.ErrListenerClosed {
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panic(err)
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}
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}
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func EchoServer(ws *websocket.Conn) {
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if _, err := io.Copy(ws, ws); err != nil {
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panic(err)
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}
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}
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func serveWS(l net.Listener) {
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s := &http.Server{
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Handler: websocket.Handler(EchoServer),
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}
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if err := s.Serve(l); err != cmux.ErrListenerClosed {
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panic(err)
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}
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}
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type ExampleRPCRcvr struct{}
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func (r *ExampleRPCRcvr) Cube(i int, j *int) error {
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*j = i * i
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return nil
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}
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func serveRPC(l net.Listener) {
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s := rpc.NewServer()
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if err := s.Register(&ExampleRPCRcvr{}); err != nil {
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panic(err)
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}
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for {
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conn, err := l.Accept()
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if err != nil {
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if err != cmux.ErrListenerClosed {
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panic(err)
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}
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return
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}
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go s.ServeConn(conn)
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}
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}
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type grpcServer struct{}
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func (s *grpcServer) SayHello(ctx context.Context, in *helloworld.HelloRequest) (
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*helloworld.HelloReply, error) {
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return &helloworld.HelloReply{Message: "Hello " + in.Name + " from cmux"}, nil
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}
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func serveGRPC(l net.Listener) {
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grpcs := grpc.NewServer()
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helloworld.RegisterGreeterServer(grpcs, &grpcServer{})
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if err := grpcs.Serve(l); err != cmux.ErrListenerClosed {
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panic(err)
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}
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}
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func Example() {
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l, err := net.Listen("tcp", "127.0.0.1:50051")
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if err != nil {
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log.Panic(err)
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}
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m := cmux.New(l)
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// We first match the connection against HTTP2 fields. If matched, the
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// connection will be sent through the "grpcl" listener.
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grpcl := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
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//Otherwise, we match it againts a websocket upgrade request.
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wsl := m.Match(cmux.HTTP1HeaderField("Upgrade", "websocket"))
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// Otherwise, we match it againts HTTP1 methods. If matched,
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// it is sent through the "httpl" listener.
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httpl := m.Match(cmux.HTTP1Fast())
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// If not matched by HTTP, we assume it is an RPC connection.
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rpcl := m.Match(cmux.Any())
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// Then we used the muxed listeners.
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go serveGRPC(grpcl)
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go serveWS(wsl)
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go serveHTTP(httpl)
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go serveRPC(rpcl)
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if err := m.Serve(); !strings.Contains(err.Error(), "use of closed network connection") {
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panic(err)
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}
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}
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