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April 22, 2010 06:20
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/* | |
* Mclarens Bar: Redis based Instant Messaging | |
* Nikhil Marathe - 22/04/2010 | |
* A simple example of an IM client implemented using | |
* Redis PUB/SUB commands so that all the communication | |
* is offloaded to Redis, and the node.js code only | |
* handles command interpretation,presentation and subscribing. | |
* | |
* Requires redis-node-client and a recent version of Redis | |
* http://code.google.com/p/redis | |
* http://github.com/fictorial/redis-node-client | |
* | |
* Start the server then telnet to port 8000 | |
* Register with NICK <nick>, use WHO to see others | |
* Use TALKTO <nick> to initiate a chat. Send a message | |
* using MSG <nick> <msg>. Note its important to do a | |
* TALKTO so that both sides are listening. Use STOP <nick> | |
* to stop talking to someone, and QUIT to exit. | |
* | |
* This code is in the public domain. | |
*/ | |
var redis = require('./redis-node-client/lib/redis-client'); | |
var sys = require('sys'); | |
var net = require('net'); | |
var server = net.createServer(function(stream) { | |
var sub; // redis connection | |
var pub; | |
var registered = false; | |
var nick = ""; | |
function channel(a,b) { | |
return [a,b].sort().join(':'); | |
} | |
function shareTable(other) { | |
sys.debug(nick + ": Subscribing to "+channel(nick,other)); | |
sub.subscribeTo(channel(nick,other), function(channel, message) { | |
var str = message.toString(); | |
var sender = str.slice(0, str.indexOf(':')); | |
if( sender != nick ) | |
stream.write("[" + sender + "] " + str.substr(str.indexOf(':')+1) + "\n"); | |
}); | |
} | |
function leaveTable(other) { | |
sub.unsubscribeFrom(channel(nick,other), function(err) { | |
stream.write("Stopped talking to " + other+ "\n"); | |
}); | |
} | |
stream.addListener("connect", function() { | |
sub = redis.createClient(); | |
pub = redis.createClient(); | |
}); | |
stream.addListener("data", function(data) { | |
if( !registered ) { | |
var msg = data.toString().match(/^NICK (\w*)/); | |
if(msg) { | |
stream.write("SERVER: Hi " + msg[1] + "\n"); | |
pub.sadd('mclarens:inside', msg[1], function(err) { | |
if(err) { | |
stream.end(); | |
} | |
registered = true; | |
nick = msg[1]; | |
// server messages | |
sub.subscribeTo( nick + ":info", function(nick, message) { | |
var m = message.toString().split(' '); | |
var cmd = m[0]; | |
var who = m[1]; | |
if( cmd == "start" ) { | |
stream.write( who + " is now talking to you\n"); | |
shareTable(who); | |
} | |
else if( cmd == "stop" ) { | |
stream.write( who + " stopped talking to you\n"); | |
leaveTable(who); | |
} | |
}); | |
}); | |
} | |
else { | |
stream.write("Please register with NICK <nickname>\n"); | |
} | |
return; | |
} | |
var fragments = data.toString().replace('\r\n', '').split(' '); | |
switch(fragments[0]) { | |
case 'TALKTO': | |
pub.publish(fragments[1]+":info", "start " + nick, function(a,b) { | |
}); | |
shareTable(fragments[1]); | |
break; | |
case 'MSG': | |
pub.publish(channel(nick, fragments[1]), | |
nick + ':' +fragments.slice(2).join(' '), | |
function(err, reply) { | |
if(err) { | |
stream.write("ERROR!"); | |
} | |
}); | |
break; | |
case 'WHO': | |
pub.smembers('mclarens:inside', function(err, users) { | |
stream.write("Online:\n" + users.join('\n') + "\n"); | |
}); | |
break; | |
case 'STOP': | |
leaveTable(fragments[1]); | |
pub.publish(fragments[1]+":info", "stop " + nick, function() {}); | |
break; | |
case 'QUIT': | |
stream.end(); | |
break; | |
} | |
}); | |
stream.addListener("end", function() { | |
pub.publish(nick, nick + " is offline"); | |
pub.srem('mclarens:inside', nick, function(err) { | |
if(err) { | |
sys.debug("Could not remove client"); | |
} | |
}); | |
}); | |
}); | |
server.listen(8000, "localhost"); |
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This is like a NodeRed-lite. Nice.