Created
February 5, 2014 10:11
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redis & socket.io
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| modules = [ 'then-redis', 'http', 'express', 'socket.io' ] | |
| [ redis, http, express, io ] = (require(mod) for mod in modules) | |
| # redis | |
| db = redis.createClient() | |
| db.setnx('users:count', 0) | |
| # server | |
| app = express() | |
| index = (req, res) -> | |
| res.sendfile(__dirname + '/index.html') | |
| app.get('/', index) | |
| server = http.createServer(app) | |
| server.listen(process.env.PORT) | |
| # pubsub | |
| sockets = io.listen(server).sockets | |
| key = 'users:count' | |
| onconnect = (socket) -> | |
| publish = db.publish.bind(db, key) | |
| db.incr(key).then(publish) | |
| socket.on('disconnect', -> db.decr(key).then(publish)) | |
| sockets.on('connection', onconnect) | |
| client = redis.createClient() | |
| client.on('message', sockets.emit.bind(sockets)) | |
| client.subscribe(key) |
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| <!DOCTYPE html> | |
| <html> | |
| <head></head> | |
| <body> | |
| <script src="/socket.io/socket.io.js"></script> | |
| <script> | |
| var socket = io.connect('http://localhost'); | |
| socket.on('users:count', function (data) { | |
| console.log(data); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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