├── .gitignore
├── README.md
├── app.js
├── package.json
└── public
├── index.html
└── stylesheets
└── style.css
/.gitignore:
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1 | node_modules/*
2 |
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/README.md:
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1 | Scalable Socket.IO Sample
2 | =============
3 |
4 | A minimal sample to demo the scalability of socket.io with node cluster, redis, and express.
5 |
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/app.js:
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1 | var cluster = require('cluster')
2 | , numCPUs = require('os').cpus().length
3 |
4 | if (cluster.isMaster) {
5 | var worker, i;
6 | // Fork workers.
7 | for (i = 0; i < numCPUs; i++) {
8 | worker = cluster.fork();
9 | console.info('Workerer #' + worker.id, 'with pid', worker.process.pid, 'is on');
10 | }
11 |
12 | cluster.on('exit', function(worker, code, signal) {
13 | console.info('Workerer #' + worker.id, 'with pid', worker.process.pid, 'died');
14 | });
15 |
16 | } else {
17 |
18 | var express = require('express')
19 | , http = require('http')
20 | , path = require('path')
21 | , RedisStore = require('socket.io/lib/stores/redis')
22 | , redis = require('redis')
23 | , pub = redis.createClient()
24 | , sub = redis.createClient()
25 | , client = redis.createClient()
26 | , sio = require('socket.io');
27 |
28 | var app = express();
29 | var server
30 | , io;
31 |
32 | app.configure(function(){
33 | var i = 0;
34 | app.set('port', process.env.PORT || 3000);
35 | app.use(function (req, res, next) {
36 | console.info('Worker #' + cluster.worker.id, 'is going to handle the request');
37 |
38 | // do something to delay the worker
39 | while (i < 100000000) {
40 | i += 1;
41 | }
42 |
43 | next();
44 | });
45 | app.use(express.favicon());
46 | app.use(express.logger('dev'));
47 | app.use(express.bodyParser());
48 | app.use(express.methodOverride());
49 | app.use(app.router);
50 | app.use(express.static(path.join(__dirname, 'public')));
51 | });
52 |
53 | app.configure('development', function(){
54 | app.use(express.errorHandler());
55 | });
56 |
57 | server = http.createServer(app).listen(app.get('port'), function(){
58 | console.info("Express server listening on port " + app.get('port'));
59 | });
60 |
61 | /* Setup Socket.IO */
62 |
63 | io = sio.listen(server);
64 | io.set('store', new RedisStore({
65 | redisPub: pub
66 | , redisSub: sub
67 | , redisClient: client
68 | }));
69 | io.sockets.on('connection', function (socket) {
70 | var i = 0;
71 |
72 | // do something to delay the worker
73 | while (i < 100000000) {
74 | i += 1;
75 | }
76 |
77 | // create a private room for each client
78 | // use connect time as private room name
79 | // you might want to use the client's session id instead
80 | socket.join(Date.now());
81 |
82 | // print out all rooms
83 | console.log('Worker #' + cluster.worker.id, 'receive a connection');
84 | console.log('Current rooms:');
85 | console.log(io.sockets.manager.rooms);
86 |
87 | socket.broadcast.emit('user connected');
88 | });
89 |
90 | /* End Setup Socket.IO */
91 |
92 | }
93 |
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/package.json:
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1 | {
2 | "name": "application-name",
3 | "version": "0.0.1",
4 | "private": true,
5 | "scripts": {
6 | "start": "node app"
7 | },
8 | "dependencies": {
9 | "express": "3.0.0rc4"
10 | , "socket.io": "*"
11 | , "redis": "*"
12 | , "connect-redis": "*"
13 | }
14 | }
15 |
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/public/index.html:
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1 |
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6 |
7 |
8 |
9 |
10 |
11 |
Node: Socket.IO, Cluster, Redis, Express - All It Together
12 |
13 | Refresh the page quickly and you will see that the requests are passed to different workers.
14 |
15 | Or open new tabs to establish other connections with socket.io.
16 |