assignment-3-jicnic/server.js

//server.js 專案起始點
const WebSocket = require('ws');
const http = require('http');
const express = require("express");
const cookieSession = require("cookie-session");
const dotenv = require('dotenv').config();

const db = require('./pass_db.js');
db.users_init_fixed()
db.vote_init_random(5);     // you COULD change this, but you could also leave it alone?

const app = express();
const server = http.createServer(app); //把express透過http createServer 

const PORT = process.env.PORT || 8000; // 允許從 .env 文件或環境變量中設定端口
app.use(express.static("static"))
app.set('view engine', 'ejs')
app.use(cookieSession({
    name: 'session',
    keys: [process.env.SESSION_KEY || 'default_session_key'],
    maxAge: 24 * 60 * 60 * 1000 // 24 hours
  }))

// 使用 Express 內建的中間件來解析 JSON 和 URL 編碼的資料
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

const apiRouter = require("./routers/api")
app.use('/api/v1', apiRouter);

// app.listen(PORT, () => console.log(`server should be running at http://localhost:${PORT}/`))



const wss = new WebSocket.Server({ server }); //server的資訊拿去架設websocket
global.wss = wss; //fix it future   把wss設定存放到global供其他js檔案存取 PS:寫成global不是很好的做法 你可以考慮替換成更好的方法?

wss.on('connection', ws => { //建立連線
  console.log('New WebSocket connection'); //提示server端成功建立連線

  ws.on('message', message => { //接收客戶端傳送來的訊息
      console.log(`Received message: ${message}`); //紀錄客戶端傳送來的訊息
      // 廣播消息給所有連接的客戶端
      wss.clients.forEach(client => {
          if (client !== ws && client.readyState === WebSocket.OPEN) {
              client.send(message);
          }
      });
  });
});

server.listen(PORT, () => console.log(`Server is running at http://localhost:${PORT}/`));