使用 webRTC 在两个对等点之间创建和使用数据通道

Question

我正在尝试使用 WebRTC 设置对等文件共享系统。我可以在每一侧打开一个数据通道，但我无法从一个用户向另一个用户发送消息。此外，如果一个对等方关闭通道，另一个对等方，则仅针对该用户触发 onclose 事件。

通过 webRTC 设置和使用数据通道的正确方法是什么？

你能告诉我我的代码有什么问题或缺失吗？

//create RTC peer objet.
var RTCPeerConnection = webkitRTCPeerConnection;
var RTCIceCandidate = window.RTCIceCandidate;
var RTCSessionDescription = window.RTCSessionDescription;

var iceServers = {
    iceServers: [{
        url: 'stun:stun.l.google.com:19302'
    }]
};
var p2p_connection = new RTCPeerConnection({
      iceServers: [
        { 'url': (IS_CHROME ? 'stun:stun.l.google.com:19302' : 'stun:23.21.150.121') }
  ]
});

// send offer (only executes in one browser)
function initiateConnection() {
    p2p_connection.createOffer(function (description) {
        p2p_connection.setLocalDescription(description);
        server_socket.emit('p2p request', description,my_username);
    });
};

// receive offer and send answer
server_socket.on('p2p request', function(description,sender){ 
    console.log('received p2p request');

    p2p_connection.setRemoteDescription(new RTCSessionDescription(description));

    p2p_connection.createAnswer(function (description) {
        p2p_connection.setLocalDescription(description);
        server_socket.emit('p2p reply', description,sender);
    });
});

// receive answer
server_socket.on('p2p reply', function(description,sender){
    console.log('received p2p reply');
    p2p_connection.setRemoteDescription(new RTCSessionDescription(description));
});

// ICE candidates
p2p_connection.onicecandidate = onicecandidate; // sent event listener

// locally generated
function onicecandidate(event) {
    if (!p2p_connection || !event || !event.candidate) return;
    var candidate = event.candidate;
    server_socket.emit('add candidate',candidate,my_username);
}

// sent by other peer
server_socket.on('add candidate', function(candidate,my_username){

    p2p_connection.addIceCandidate(new RTCIceCandidate({
            sdpMLineIndex: candidate.sdpMLineIndex,
            candidate: candidate.candidate
    }));
});

// data channel 
var dataChannel = p2p_connection.createDataChannel('label');

dataChannel.onmessage = function (event) {
    var data = event.data;
    console.log("I got data channel message: ", data);
};

dataChannel.onopen = function (event) {
    console.log("Data channel ready");
    dataChannel.send("Hello World!");
};
dataChannel.onclose = function (event) {
    console.log("Data channel closed.");
};
dataChannel.onerror = function (event) {
    console.log("Data channel error!");
}

更新：

在那里找到解决方案：http : //www.html5rocks.com/en/tutorials/webrtc/basics/

p2p_connection.ondatachannel = function (event) {
    receiveChannel = event.channel;
    receiveChannel.onmessage = function(event){
    console.log(event.data);
    };
};

Answer 1

您可能会考虑使用该simple-peer库来避免将来处理这些复杂性。WebRTC API 调用很混乱，有时很难正确排序。

simple-peer支持视频/语音流、数据通道（文本和二进制数据），您甚至可以将数据通道用作node.js样式的双工流。它还支持高级选项，例如禁用滴流 ICE 候选者（因此每个客户端只需发送一条提供/应答消息，而不是许多重复的 ICE 候选者消息）。它不固执，适用于任何后端。

https://github.com/feross/simple-peer