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index.js
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index.js
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const Koa = require('koa');
const ws = require('ws');
const Cookies = require('cookies');
const bodyParser = require('koa-bodyparser')();
const router = require('koa-router')();
const template = require('./template.js');
const controller = require('./controller');
const rest = require('./rest');
const cors = require('koa2-cors')
const handleStaticFiles = require('./handleStaticFiles');
const isProduction = process.env.NODE_ENV === 'production';
// 创建Koa服务
const app = new Koa();
// 计算请求时间
app.use(async (ctx, next) => {
const start = new Date().getTime();
await next();
const execTime = new Date().getTime() - start;
ctx.response.set('X-Response-Time', `${execTime}ms`);
});
app.use(async (ctx, next) => {
ctx.state.user = parseUser(ctx.cookies.get('user') || '');
await next();
})
// 解析 body
app.use(bodyParser);
// 处理静态资源
if (!isProduction) {
app.use(handleStaticFiles('/static'));
}
// 创建 ctx.render(view, model) 函数
app.use(template('views', { noCache: !isProduction, watch: !isProduction }));
// 创建 ctx.rest(data) 函数
app.use(rest.restify());
// 添加路由
app.use(controller(router));
// 启动Koa
const server = app.listen(3000);
const WebSocketServer = ws.Server;
app.wss = createWebSocketServer(server, onConnection, onMessage, onClose, onError);
console.log('server is starting at port 3000 ... ');
function parseUser(obj) {
if(!obj) {
return;
}
console.log('try parse: ' + obj);
let userString = '';
if(typeof obj === 'string') {
userString = obj;
} else if(obj.headers) {
const cookies = new Cookies(obj, null);
userString = cookies.get('user');
console.log('=====user: ', userString);
}
if(userString) {
try {
const user = JSON.parse(Buffer.from(userString, 'base64').toString());
console.log(`User: ${user.name}, ID: ${user.id}`);
return user;
} catch (error) {
console.log(`parseUser error: ${error}`);
}
}
}
function createWebSocketServer(server, onConnection, onMessage, onClose, onError) {
const wss = new WebSocketServer({ server });
wss.broadcast = function (data) {
wss.clients.forEach(function (client) {
client.send(data);
})
}
wss.on('connection', function (ws, req) {
ws.on('message', onMessage);
ws.on('close', onClose);
ws.on('error', onError);
if(req.url!== '/ws/chat') {
ws.close(4000, 'Invaild URL');
}
const user = parseUser(req);
if(!user) {
ws.close(4001, 'Invalid user');
}
ws.user = user;
ws.wss = wss;
onConnection.apply(ws);
});
console.log('WebSocketServer was attached.');
return wss;
}
// 刷新用户列表
function refreshUserList() {
// build user list;
const users = [...this.wss.clients].map(function(client) {
return client.user;
});
const listMsg = createMessage('list', this.user, users);
this.wss.broadcast(listMsg);
}
function onConnection() {
console.log('[WebSocket] connected.');
const user = this.user;
const joinMsg = createMessage('join', user, `${user.name} 加入聊天室.`);
this.wss.broadcast(joinMsg);
refreshUserList.call(this);
}
function onMessage(message) {
console.log('[WebSocket] message received.');
if(message && message.trim()) {
const msg = createMessage('chat', this.user, message);
this.wss.broadcast(msg);
}
}
function onClose(code, message) {
console.log(`[WebSocket] closed: ${code}-${message}`);
const user = this.user;
const leftMsg = createMessage('left', user, `${user.name} 离开聊天室.`);
this.wss.broadcast(leftMsg);
refreshUserList.call(this);
}
function onError(error) {
console.log('[WebSocket] error: ' + error);
}
var messageIndex = 0;
function createMessage(type, user, data) {
messageIndex ++;
return JSON.stringify({
type,
user,
data,
id: messageIndex,
});
}