github.com/gdamore/mangos@v1.4.0/examples/websocket/reqhandler.go (about)

     1  // Copyright 2018 The Mangos Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use file except in compliance with the License.
     5  // You may obtain a copy of the license at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"fmt"
    19  	"net/http"
    20  	"time"
    21  
    22  	"nanomsg.org/go-mangos"
    23  	"nanomsg.org/go-mangos/protocol/rep"
    24  	"nanomsg.org/go-mangos/transport/ws"
    25  )
    26  
    27  // reqHandler just spins on the socket and reads messages.  It replies
    28  // with "REPLY <time>".  Not very interesting...
    29  
    30  func reqHandler(sock mangos.Socket) {
    31  	count := 0
    32  	for {
    33  		// don't care about the content of received message
    34  		_, e := sock.Recv()
    35  		if e != nil {
    36  			die("Cannot get request: %v", e)
    37  		}
    38  		reply := fmt.Sprintf("REPLY #%d %s", count, time.Now().String())
    39  		if e := sock.Send([]byte(reply)); e != nil {
    40  			die("Cannot send reply: %v", e)
    41  		}
    42  		count++
    43  	}
    44  }
    45  
    46  func addReqHandler(mux *http.ServeMux, port int) {
    47  	sock, _ := rep.NewSocket()
    48  
    49  	sock.AddTransport(ws.NewTransport())
    50  
    51  	url := fmt.Sprintf("ws://127.0.0.1:%d/req", port)
    52  
    53  	if l, e := sock.NewListener(url, nil); e != nil {
    54  		die("bad listener: %v", e)
    55  	} else if h, e := l.GetOption(ws.OptionWebSocketHandler); e != nil {
    56  		die("bad handler: %v", e)
    57  	} else {
    58  		mux.Handle("/req", h.(http.Handler))
    59  		l.Listen()
    60  	}
    61  	go reqHandler(sock)
    62  }