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POHow can I have different web browsers subscribe to separate channels in a Redis/Node.js/Socket.io pub/sub setup?
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2011-11-11T04:35:07.347
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<p>I'd like different clients (web browsers) to be able to subscribe to separate Redis channels.</p> <p>I'm able to pass the requested channel from the client page to the node.js server. But, if I have three browsers subscribe each subscribe three separate channels, all three browsers receive messages published to any of the three channels.</p> <p>Here is the client HTML code. I have three separate pages with the channel name hardcoded into it. In this example, the channel is "channel1".</p> <p><strong>client1.html</strong></p> <pre><code><script src="/socket.io/socket.io.js"></script> <script> var socket = io.connect('http://localhost'); socket.on('giveChannel', function () { console.log('sending channel'); socket.emit('sendChannel', "{\"channel\":\"channel\"}"); }); socket.on('message', function (data) { console.log(data); }); </script> </code></pre> <p>Here is the Node.js file.</p> <p><strong>app.js</strong></p> <pre><code>redis = require('redis'), sys = require('sys'); var http = require('http'); var url = require('url'); var fs = require('fs'); var server = http.createServer(function (req, res) { var path = url.parse(req.url).pathname; fs.readFile(__dirname + path, function(err, data) { if (err) return null; res.writeHead(200, {'Content-Type': 'text/html'}); res.write(data, 'utf8'); res.end(); }); }); io = require('socket.io').listen(server); io.sockets.on('connection', function (socket) { var rc = redis.createClient(); rc.on("connect", function() { sys.log('connected to redis'); }); rc.on("message", function (channel, message) { sys.log("Sending: " + message); io.sockets.emit('message', message); }); socket.emit('giveChannel'); socket.on('sendChannel', function (msg) { console.log(msg); var data = JSON.parse(msg); console.log(data.channel); rc.subscribe(data.channel); }); }); server.listen(8000, '0.0.0.0'); </code></pre>
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<javascript><node.js><redis><socket.io><publish-subscribe>
Title
How can I have different web browsers subscribe to separate channels in a Redis/Node.js/Socket.io pub/sub setup?
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1. USNick Messick
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1. CORelated [question](http://stackoverflow.com/questions/5739357/how-to-reuse-redis-connection-in-socket-io/5742676)
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  POHow can I have different web browsers subscribe to separate channels in a Redis/Node.js/Socket.io pub/sub setup?
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  USGanesh Kumar

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