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webrtc学习笔记六(datachannel+websocket)

webrtc 
阅读更多
2020年5月12日更新
5年前的例子又不好使了，
出现错误
websocket Failed to execute 'send' on 'WebSocket': Still in CONNECTING state
参考：https://blog.csdn.net/bossxu_/article/details/102977802

原因是
pc.createOffer 的时候websocket还没建立完，socket.send出现问题，
把这段代码加到websocket.onopen事件里就好了：


只有datachannel的例子，websocket作为转发用，
建立连接后websocket就可以关了
server.js 
//http://www.blogjava.net/linli/archive/2014/10/21/418910.html
var express = require('express'),
app = express(),
server = require('http').createServer(app);

server.listen(3000);

app.get('/', function(req, res) {
    res.sendfile(__dirname + '/webrtc.html');
});

var WebSocketServer = require('ws').Server,
wss = new WebSocketServer({server: server});
function writeObj(obj){ 
    var description = ""; 
    for(var i in obj){   
        var property=obj[i];   
        description+=i+" = "+property+"\n";  
    }   
    console.log(description); 
} 
// 存储socket的数组，这里只能有2个socket，每次测试需要重启，否则会出错
var wsc = [],
index = 1;
// 有socket连入
wss.on('connection', function(ws) {
    console.log('connection:');
    //writeObj(ws);
    // 将socket存入数组
    wsc.push(ws);
    // 记下对方socket在数组中的下标，因为这个测试程序只允许2个socket
    // 所以第一个连入的socket存入0，第二个连入的就是存入1
    // otherIndex就反着来，第一个socket的otherIndex下标为1，第二个socket的otherIndex下标为0
    var otherIndex = index--,
    desc = null;

    if (otherIndex == 1) {
        desc = 'first socket';
    } else {
        desc = 'second socket';
    }
    // 转发收到的消息
    ws.on('message', function(message) {
        var json = JSON.parse(message);
        //console.log('received (' + desc + '): ', json);
        console.log('otherIndex ---('+desc+')(' + otherIndex + '): '+json.event);
        wsc[otherIndex].send(message, function (error) {
            if (error) {
                console.log('Send message error (' + desc + '): ', error);
            }
        });
    });
});


webrtc_datachannle.html 

<html>
<body>
<button id="sendButton" onclick="sendData()">Send</button>
<textarea id="dataChannelSend" >abc</textarea>
<textarea id="dataChannelReceive" ></textarea>

<script>
        var isCaller = window.location.href.split('#')[1];
        var socket = new WebSocket("ws://127.0.0.1:3000");
		socket.onopen=function(){ //这部分放到onopen事件里了 2020.05.12
			console.log("socket on open --->");
			if(isCaller){
        	    console.log("------->createOffer");
        	    pc.createOffer(function(desc){
        	    //  console.log(desc);
        	        pc.setLocalDescription(desc);
        	        console.log("---------------->pc.setLocal");
        	        socket.send(JSON.stringify({
        	            "event": "_offer",
        	            "data": {
        	                "sdp": desc
        	            }
        	        }));
        	    }, function (error) {
        	        console.log('Failure callback: ' + error);
        	    });
        	}
		}
        socket.onmessage = function(event){
            var json = JSON.parse(event.data);
            //console.log('onmessage: ', json);
            //如果是一个ICE的候选，则将其加入到PeerConnection中，否则设定对方的session描述为传递过来的描述
            if( json.event === "_ice_candidate" ){
                pc.addIceCandidate(new RTCIceCandidate(json.data.candidate));
            } else {
                pc.setRemoteDescription(new RTCSessionDescription(json.data.sdp));
                console.log("---------------->pc.setRemote");
                // 如果是一个offer，那么需要回复一个answer
                if(json.event === "_offer") {
                    console.log("------->createAnswer");
                    pc.createAnswer(function(desc){
                        pc.setLocalDescription(desc);
                        console.log("---------------->pc.setLocal");
                        socket.send(JSON.stringify({
                            "event": "_answer",
                            "data": {
                                "sdp": desc
                            }
                        }));
                    }, function (error) {
                        console.log('Failure callback: ' + error);
                    });
                }else{
                    console.log("------->receive Answer---('"+json.event+"')");
                }

            }
        };
        var iceServer = null;
        var pc = new webkitRTCPeerConnection(iceServer,{optional: [{RtpDataChannels: true}]});
        try {
            sendChannel = pc.createDataChannel('sendDataChannel',{reliable: true});
        } catch (e) {
            alert('createDataChannel() failed with exception: ' + e.message);
        }
        sendChannel.onopen = console.log('--Send channel open state is : ' +sendChannel.readyState);
        sendChannel.onclose = console.log('--Send channel close  state is: ' +sendChannel.readyState);
        // 发送ICE候选到其他客户端
        pc.onicecandidate = function(event){
            console.log("onicecandidate----------->");
            if (event.candidate !== null) {
                console.log("event.candidate   !=   null");
                socket.send(JSON.stringify({
                    "event": "_ice_candidate",
                    "data": {
                        "candidate": event.candidate
                    }
                }));
            }else{
                console.log("event.candidate   == null");
            }
        };
        sendChannel.onmessage = function(event) {
              console.log("-sendChannel--★★★★★---ondatachannel");
              document.getElementById('dataChannelReceive').value = event.data;
        };
        function sendData() {
          var data = document.getElementById('dataChannelSend').value;
          console.log("---->>>>sendData():"+data);
          sendChannel.send(data);
        }
//        if(isCaller){ //这部分放到onopen事件里了 2020.05.12
//            console.log("------->createOffer");
//            pc.createOffer(function(desc){
//            //  console.log(desc);
//                pc.setLocalDescription(desc);
//                console.log("---------------->pc.setLocal");
//                socket.send(JSON.stringify({
//                    "event": "_offer",
//                    "data": {
//                        "sdp": desc
//                    }
//                }));
//            }, function (error) {
//                console.log('Failure callback: ' + error);
//            });
//        }

    </script>
</body>
</html>
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