server.js

require('dotenv').config()
const express = require('express')
const path = require('path')
const mongoose = require('mongoose')
const cors = require('cors')
const fileUpload = require('express-fileupload')
const cookieParser = require('cookie-parser')

const app = express()
app.use(express.json())
app.use(cookieParser())
app.use(cors({
    credentials: true //Để bật cookie HTTP qua CORS
}))
app.use(fileUpload({
    useTempFiles: true
}))

const http = require('http').createServer(app)
const io = require('socket.io')(http, {
    cors: {
        origin: '*'
    }
})

//socketIO
const NEW_CHAT_MESSAGE_EVENT = "newChatMessage";

io.on("connection", (socket) => {

    // Join a conversation
    const { roomId } = socket.handshake.query;
    socket.join(roomId);

    // Listen for new messages
    socket.on(NEW_CHAT_MESSAGE_EVENT, (data) => {
        io.in(roomId).emit(NEW_CHAT_MESSAGE_EVENT, data);
    });

    // Leave the room if the user closes the socket
    socket.on("disconnect", () => {
        socket.leave(roomId);
    });
});

//Routes

app.use('/user', require('./routes/UserRouter'))
app.use('/doctor', require('./routes/DoctorRouter'))
app.use('/api', require('./routes/UploadToCloudinary')) //Cloudinary
app.use('/city', require('./routes/CityRouter'))
app.use('/district', require('./routes/DistrictRouter'))
app.use('/form', require('./routes/MedicineFormRouter'))
app.use('/medicine', require('./routes/MedicineRouter'))
app.use('/health', require('./routes/HealthDeclarationRouter'))
app.use('/pharmacy', require('./routes/PharmacyRouter'))

//connect to mongoDB
const URL = process.env.MONGO_URL
mongoose.connect(URL, {
    useCreateIndex: true,
    useFindAndModify: false,
    useNewUrlParser: true,
    useUnifiedTopology: true
}, err => {
    if (err) throw err;
    console.log('Connected to MongoDB.');
})

app.get('/', (req, res) => {
    res.json({ msg: "ON AIR!!!" })
})

const PORT = process.env.PORT || 3000
http.listen(PORT, '127.0.0.1', () => {
    console.log('Server is running on', PORT);
})