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index.js
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index.js
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const express = require('express');
const http = require('http');
const path = require('path');
const socketio = require('socket.io');
const formatMessage = require('./utils/messages');
const { userJoin, getCurrentUser, userLeave, getUsersOfRoom } = require('./utils/users');
const app = express();
const server = http.createServer(app);
const io = socketio(server);
// Set static folder
app.use(express.static(path.join(__dirname, 'public')));
const botName = 'Chatrooms Bot';
// Run when client connects
io.on('connection', socket => {
// when a client joins the room
socket.on('joinRoom', ({username, room}) => {
// join the new user to the respective room
const user = userJoin(socket.id, username, room);
socket.join(user.room);
// emit welcome message (to single client)
socket.emit('message', formatMessage(botName, 'Welcome to Chatrooms!'));
// broadcast when a user connects (to all users except the connecting user)
// "to(user.room) means to all the members of a particular room"
socket.broadcast
.to(user.room)
.emit('message', formatMessage(botName, `${user.username} has joined the chat.`));
// send users and room info
io.to(user.room).emit('roomUsers', {
room: user.room,
users: getUsersOfRoom(user.room)
});
});
// listen for message sent from client
socket.on('chatMessage', msg => {
const user = getCurrentUser(socket.id);
io.to(user.room).emit('message', formatMessage(user.username, msg));
});
// runs when client disconnects
socket.on('disconnect', () => {
const user = userLeave(socket.id);
if (user) {
io.to(user.room).emit('message', formatMessage(botName, `${user.username} has left the chat.`));
}
})
});
const PORT = process.env.PORT || 3000;
server.listen(PORT, () => console.log(`Server running on PORT ${PORT}`));