Nodejs搭建音视频通信 信令服务器
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2、安装配置环境变量
这里的环境配置主要配置的是npm安装的全局模块所在的路径,以及缓存cache的路径,之所以要配置,是因为以后在执行类似:npm install express [-g] (后面的可选参数-g,g代表global全局安装的意思)的安装语句时,会将安装的模块安装到【C:\\Users\\用户名\\AppData\\Roaming\\npm】路径中,占C盘空间。例如:我希望将全模块所在路径和缓存路径放在我node.js安装的文件夹中,则在我安装的文件夹【D:\\Develop\\nodejs】下创建两个文件夹【node_global】及【node_cache】。
创建完这两个空文件夹之后,打开cmd命令窗口,输入:
npm config set prefix "D:\\Develop\\nodejs\\node_global"
npm config set cache "D:\\Develop\\nodejs\\node_cache"
接下来设置环境变量,关闭cmd窗口,“我的电脑”-右键-“属性”-“高级系统设置”-“高级”-“环境变量”:
备注:使用npm install -g \'xxx\' 之后仍然报Cannot find module \'xxx\' 错误,可以通过设置环境变量NODE_PATH来解决。
在系统目录中找到C:\\Users\\Administrator\\.npmrc文件 修改如下即可:
cache =D:\\Develop\\nodejs\\node_cache
npm install express -g # -g是全局安装的意思
3、自签名的https证书
openssl genrsa -out 1557605_www.learningrtc.cn.key 2048//这是秘钥(生成秘钥文件)
openssl req -new -sha256 -key 1557605_www.learningrtc.cn.key -out csr.pem//签名请求文件(申请者需要将自己的信息及其公钥放入证书请求中。但在实际操作过程中,所需要提供的是私钥而非公钥,因为它会自动从私钥中提取公钥)
openssl x509 -req -in csr.pem -signkey 1557605_www.learningrtc.cn.key -out 1557605_www.learningrtc.cn.pem//这是证书
4、信令服务器主要代码
server.js文件
\'use strict\' var log4js = require(\'log4js\'); var http = require(\'http\'); var https = require(\'https\'); var fs = require(\'fs\'); var socketIo = require(\'socket.io\'); var express = require(\'express\'); var serveIndex = require(\'serve-index\'); var USERCOUNT = 3; log4js.configure({ appenders: { file: { type: \'file\', filename: \'app.log\', layout: { type: \'pattern\', pattern: \'%r %p - %m\', } } }, categories: { default: { appenders: [\'file\'], level: \'debug\' } } }); var logger = log4js.getLogger(); var app = express(); app.use(serveIndex(\'./public\')); //node server.js启动后,项目的根目录在public文件夹下(public文件夹和server.js文件在同一个目录下,public文件夹下有index.html文件、css文件和js文件夹等) app.use(express.static(\'./public\')); //http server var http_server = http.createServer(app); http_server.listen(80, \'0.0.0.0\'); var options = { key : fs.readFileSync(\'./cert/1557605_www.learningrtc.cn.key\'), //https秘钥,放在cert文件夹下 cert: fs.readFileSync(\'./cert/1557605_www.learningrtc.cn.pem\') //https证书,放在cert文件夹下 } //https server var https_server = https.createServer(options, app); var io = socketIo.listen(https_server); io.sockets.on(\'connection\', (socket)=> { socket.on(\'message\', (room, data)=>{ logger.debug(\'message, room: \' + room + ", data, type:" + data.type); socket.to(room).emit(\'message\',room, data); }); /* socket.on(\'message\', (room)=>{ logger.debug(\'message, room: \' + room ); socket.to(room).emit(\'message\',room); }); */ socket.on(\'join\', (room)=>{ socket.join(room); var myRoom = io.sockets.adapter.rooms[room]; var users = (myRoom)? Object.keys(myRoom.sockets).length : 0; logger.debug(\'the user number of room (\' + room + \') is: \' + users); if(users < USERCOUNT){ socket.emit(\'joined\', room, socket.id); //发给除自己之外的房间内的所有人 if(users > 1){ socket.to(room).emit(\'otherjoin\', room, socket.id); } }else{ socket.leave(room); socket.emit(\'full\', room, socket.id); } //socket.emit(\'joined\', room, socket.id); //发给自己 //socket.broadcast.emit(\'joined\', room, socket.id); //发给除自己之外的这个节点上的所有人 //io.in(room).emit(\'joined\', room, socket.id); //发给房间内的所有人 }); socket.on(\'leave\', (room)=>{ socket.leave(room); var myRoom = io.sockets.adapter.rooms[room]; var users = (myRoom)? Object.keys(myRoom.sockets).length : 0; logger.debug(\'the user number of room is: \' + users); //socket.emit(\'leaved\', room, socket.id); //socket.broadcast.emit(\'leaved\', room, socket.id); socket.to(room).emit(\'bye\', room, socket.id); socket.emit(\'leaved\', room, socket.id); //io.in(room).emit(\'leaved\', room, socket.id); }); }); https_server.listen(8443, \'0.0.0.0\');
index.html文件:
<html> <head> <title>Chat Room</title> <link rel="stylesheet" href="./css/main.css"></link> </head> <body> <table align="center"> <tr> <td> <label>UserName: </label> <input type=text id="username"></input> </td> </tr> <tr> <td> <label>room: </label> <input type=text id="room"></input> <button id="connect">Conect</button> <button id="leave" disabled>Leave</button> </td> </tr> <tr> <td> <label>Content: </label><br> <textarea disabled style="line-height: 1.5;" id="output" rows="10" cols="100"></textarea> </td> </tr> <tr> <td> <label>Input: </label><br> <textarea disabled id="input" rows="3" cols="100"></textarea> </td> </tr> <tr> <td> <button id="send">Send</button> </td> </tr> </table> <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.3/socket.io.js"></script> <script src="./js/client.js"></script> </body> </html>
client.js文件:
\'use strict\' var userName = document.querySelector(\'input#username\'); var inputRoom = document.querySelector(\'input#room\'); var btnConnect = document.querySelector(\'button#connect\'); var btnLeave = document.querySelector(\'button#leave\'); var outputArea = document.querySelector(\'textarea#output\'); var inputArea = document.querySelector(\'textarea#input\'); var btnSend = document.querySelector(\'button#send\'); var socket; var room; btnConnect.onclick = ()=>{ //connect socket = io.connect(); //recieve message socket.on(\'joined\', (room, id) => { btnConnect.disabled = true; btnLeave.disabled = false; inputArea.disabled = false; btnSend.disabled = false; alert("room:"+room + ",id:"+id); }); socket.on(\'leaved\', (room, id) => { btnConnect.disabled = false; btnLeave.disabled = true; inputArea.disabled = true; btnSend.disabled = true; socket.disconnect(); }); socket.on(\'message\', (room, data) => { outputArea.scrollTop = outputArea.scrollHeight;//窗口总是显示最后的内容 outputArea.value = outputArea.value + data + \'\\r\'; }); socket.on(\'disconnect\', (socket)=>{ btnConnect.disabled = false; btnLeave.disabled = true; inputArea.disabled = true; btnSend.disabled = true; }); //send message room = inputRoom.value; socket.emit(\'join\', room); } btnSend.onclick = ()=>{ var data = inputArea.value; data = userName.value + \':\' + data; socket.emit(\'message\', room, data); inputArea.value = \'\'; } btnLeave.onclick = ()=>{ room = inputRoom.value; socket.emit(\'leave\', room); } inputArea.onkeypress = (event)=> { //event = event || window.event; if (event.keyCode == 13) { //回车发送消息 var data = inputArea.value; data = userName.value + \':\' + data; socket.emit(\'message\', room, data); inputArea.value = \'\'; event.preventDefault();//阻止默认行为 } }
5、启动服务
cmd窗口,进入项目位置,输入:node server.js 启动服务。
Chrome浏览器和360极速浏览器,页面分别输入https://localhost:8443/index.html,加入同一个房间,可以发送聊天信息,房间里的用户可以识别到新加入的用户(收到join等消息)。
参考地址:
https://blog.csdn.net/u012853084/article/details/79089946
https://blog.csdn.net/paulowina/article/details/78591432
https://blog.csdn.net/abccheng/article/details/82622899
https://www.iteye.com/blog/freeman983-1350861
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