javascript - 需要升级 (node.js)

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。

我应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，它列出了需要升级。

我搜索了如何升级 node.js。

我试过了

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

在此之后，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');

由于您想使用与在 Web 浏览器中使用的方法相同的方法，(ws.onopen、ws.onerror、...)，我会建议您改用 websocket 包和 w3cwebsocket 模块。

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

在评论中讨论了这个问题后，我建议您完全删除 'ws' 包并改用 'websocket'。

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

与其直接创建 WebSocket 服务器，不如先创建一个 HTTP 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
});

一个新的连接会触发request事件，你必须接受传入的连接:

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

您将能够使用 connections 属性检索客户端列表。

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