/usr/share/gocode/src/github.com/cockroachdb/cmux/example_test.go is in golang-github-cockroachdb-cmux-dev 0.0~git20170110.0.30d10be-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | // 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"
"golang.org/x/net/context"
"golang.org/x/net/websocket"
"google.golang.org/grpc"
"google.golang.org/grpc/examples/helloworld/helloworld"
"github.com/cockroachdb/cmux"
)
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 *helloworld.HelloRequest) (
*helloworld.HelloReply, error) {
return &helloworld.HelloReply{Message: "Hello " + in.Name + " from cmux"}, nil
}
func serveGRPC(l net.Listener) {
grpcs := grpc.NewServer()
helloworld.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.HTTP2HeaderField("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)
}
}
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