Question

我使用webRTC制作了信令服务器。这就是我制作信令服务器（signaling.js）的原因。

我该怎么做才能解决这个问题？

·signaling.js

"use strict"; 


let WebSocketServer = require('ws').Server;
let port = 3001;
let wsServer = new WebSocketServer({ port: port });
console.log('websocket server start. port=' + port);

wsServer.on('connection', function(ws) {
  console.log('-- websocket connected --');
  ws.on('message', function(message) {
    wsServer.clients.forEach(function each(client) {
      if (isSame(ws, client)) {
        console.log('- skip sender -');
      }
      else {
        client.send(message);
      }
    });
  });
});

function isSame(ws1, ws2) {
  // -- compare object --
  return (ws1 === ws2);
}  let wsUrl = 'ws://localhost:3001/';
  let ws = new WebSocket(wsUrl);
  ws.onopen = function(evt) {
    console.log('ws open()');
  };
  ws.onerror = function(err) {
    console.error('ws onerror() ERR:', err);
  };

  ws.onmessage = function(evt) {
   console.log('ws onmessage() data:', evt.data);
   let message = JSON.parse(evt.data);
   if (message.type === 'offer') {
     // -- got offer ---
     console.log('Received offer ...');
     textToReceiveSdp.value = message.sdp;
     let offer = new RTCSessionDescription(message);
     setOffer(offer);
   }
   else if (message.type === 'answer') {
     // --- got answer ---
     console.log('Received answer ...');
     textToReceiveSdp.value = message.sdp;
     let answer = new RTCSessionDescription(message);
     setAnswer(answer);
   }
 };

 function sendSdp(sessionDescription) {
    console.log('---sending sdp ---');

    textForSendSdp.value = sessionDescription.sdp;
    /*--- テキストエリアをハイライトするのを止める
    textForSendSdp.focus();
    textForSendSdp.select();
    ----*/

    // --- シグナリングサーバーに送る ---
    let message = JSON.stringify(sessionDescription);
    console.log('sending SDP=' + message);
    ws.send(message);
  }

当我加载“signaling.js”时，我设置了node.js. 之后，我访问signaling.js。但是，它列出了所需的升级。

我搜索了如何升级node.js。

我试过

Linux/Mac:

The module n makes version-management easy:

sudo npm install n -g
sudo n 0.12.2
For the latest stable version:

sudo n stable
For the latest version:

sudo n latest

之后，我访问了signaling.js

/signaling.js:26
  let ws = new WebSocket(wsUrl);
               ^

ReferenceError: WebSocket is not defined
    at Object.<anonymous> (/Users/Desktop/webRTC/signaling.js:26:16)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:394:7)
    at startup (bootstrap_node.js:149:9)
    at bootstrap_node.js:509:3

Answer 1

看起来您正在尝试在同一个脚本中创建WebSockets客户端和服务器。

/signaling.js:26
  let ws = new WebSocket(wsUrl);
               ^

ReferenceError: WebSocket is not defined

发生此错误是因为您忘记在文件顶部定义WebSocket变量：

var WebSocket = require('ws');

由于您希望使用与在网络浏览器中使用相同的方法（ws.onopen，ws.onerror，...），我建议您使用websocket而是使用w3cwebsocket模块打包。

var WebSocket = require('websocket').w3cwebsocket;

在评论中讨论了问题后，我建议您完全删除'ws'包，然后使用'websocket'。

var WebSocketServer = require('websocket').server;

您应该首先创建HTTP服务器，而不是直接创建WebSocket服务器：

var server = http.createServer(function(request, response) {
    console.log((new Date()) + ' Received request for ' + request.url);
    response.writeHead(404);
    response.end();
});
server.listen(8080, function() {
    console.log((new Date()) + ' Server is listening on port 8080');
});

然后在其上附加WebSocket服务器：

wsServer = new WebSocketServer({
    httpServer: server,
    autoAcceptConnections: false
});

新连接会触发request事件，您必须接受传入连接：

// wsServer.on('connection', function(ws) {
wsServer.on('request', function(request) {
    var ws = request.accept();

您将能够使用connections属性检索客户列表。

// wsServer.clients.forEach(function each(client) {
wsServer.connections.forEach(function each(client) {

需要升级（node.js）

1 个答案: