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websocket-chat-server.js
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websocket-chat-server.js
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// Borrowed from https://github.com/socketio/socket.io/blob/master/examples/chat/index.js
// Setup basic express server
const express = require('express');
const app = express();
const path = require('path');
const server = require('http').createServer(app);
const io = require('socket.io')(server);
const port = process.env.PORT || 3000;
server.listen(port, () => {
console.log('Server listening at port %d', port);
});
// Routing
app.use(express.static(path.join(__dirname, 'public')));
// Chatroom
let numUsers = 0;
io.on('connection', (socket) => {
let addedUser = false;
// when the client emits 'new message', this listens and executes
socket.on('new message', (data) => {
// we tell the client to execute 'new message'
socket.broadcast.emit('new message', {
username: socket.username,
message: data
});
});
// when the client emits 'add user', this listens and executes
socket.on('add user', (username) => {
if (addedUser) return;
// we store the username in the socket session for this client
socket.username = username;
++numUsers;
addedUser = true;
socket.emit('login', {
numUsers: numUsers
});
// echo globally (all clients) that a person has connected
socket.broadcast.emit('user joined', {
username: socket.username,
numUsers: numUsers
});
});
// when the client emits 'typing', we broadcast it to others
socket.on('typing', () => {
socket.broadcast.emit('typing', {
username: socket.username
});
});
// when the client emits 'stop typing', we broadcast it to others
socket.on('stop typing', () => {
socket.broadcast.emit('stop typing', {
username: socket.username
});
});
// when the user disconnects.. perform this
socket.on('disconnect', () => {
if (addedUser) {
--numUsers;
// echo globally that this client has left
socket.broadcast.emit('user left', {
username: socket.username,
numUsers: numUsers
});
}
});
});