github.com/gdamore/mangos@v1.4.0/examples/websocket/subhandler.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/pub"
    24  	"nanomsg.org/go-mangos/transport/ws"
    25  )
    26  
    27  // subHandler just spins on the socket and publishes messages.  It sends
    28  // "PUB #<count> <time>".  Not very interesting...
    29  
    30  func subHandler(sock mangos.Socket) {
    31  	count := 0
    32  	for {
    33  		msg := fmt.Sprintf("PUB #%d %s", count, time.Now().String())
    34  		if e := sock.Send([]byte(msg)); e != nil {
    35  			die("Cannot send pub: %v", e)
    36  		}
    37  		time.Sleep(5 * time.Second)
    38  		count++
    39  	}
    40  }
    41  
    42  func addSubHandler(mux *http.ServeMux, port int) {
    43  	sock, _ := pub.NewSocket()
    44  
    45  	sock.AddTransport(ws.NewTransport())
    46  
    47  	url := fmt.Sprintf("ws://127.0.0.1:%d/sub", port)
    48  
    49  	if l, e := sock.NewListener(url, nil); e != nil {
    50  		die("bad listener: %v", e)
    51  	} else if h, e := l.GetOption(ws.OptionWebSocketHandler); e != nil {
    52  		die("cannot get handler:", e)
    53  	} else {
    54  		mux.Handle("/sub", h.(http.Handler))
    55  		l.Listen()
    56  	}
    57  
    58  	go subHandler(sock)
    59  }