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sockets.js
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sockets.js
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var amqp = require('amqp');
var sys = require('sys');
var EventEmitter = require('events').EventEmitter;
var debug = (process.env['DEBUG']) ?
function(msg) { sys.debug(msg) } : function() {};
function pubSocket(connection, client, exchangeName) {
sys.log('pub socket opened');
var exchange = (exchangeName == '') ?
connection.exchange('amq.fanout', {'passive': true}) :
connection.exchange(exchangeName,
{'type': 'fanout'});
client.on('message', function(msg) {
debug('pub:'); debug(msg);
exchange.publish('', msg);
});
}
function subSocket(connection, client, exchangeName) {
sys.log('sub socket opened');
var exchange = (exchangeName == '') ?
connection.exchange('amq.fanout', {'passive': 'true'}) :
connection.exchange(exchangeName,
{'type': 'fanout'});
var queue = connection.queue('');
queue.subscribe(function(message) {
debug('sub:'); debug(message);
client.send(message.data.toString());
});
queue.bind(exchange.name, '');
}
function pushSocket(connection, client, queueName) {
sys.log('push socket opened');
if (queueName == '') {
client.send("Must send address for push");
client.end();
return;
}
var queue = connection.queue(queueName, {'autoDelete': false,
'durable': true,
'exclusive': false});
var exchange = connection.exchange('');
client.on('message', function(msg) {
debug('push:'); debug(msg);
exchange.publish(queueName, msg);
});
}
function pullSocket(connection, client, queueName) {
sys.debug('pull socket opened');
if (queueName == '') {
client.send("Must send address for pull");
client.end();
return;
}
var queue = connection.queue(queueName, {'autoDelete': false,
'durable': true,
'exclusive': false});
queue.subscribe(function(message) {
debug('pull:'); debug(message);
client.send(message.data.toString());
});
}
function reqSocket(connection, client, queueName) {
sys.log("req socket opened");
if (queueName == '') {
client.send("Must send address for req");
client.end();
return;
}
var replyQueue = connection.queue('', {'exclusive': true,
'autoDelete': true,
'durable': false});
var requestQueue = connection.queue(queueName, {'durable': true,
'autoDelete': false});
replyQueue.subscribe(function(message) {
debug('reply:'); debug(message);
client.send(message.data.toString());
});
client.on('message', function(message) {
debug('request:'); debug(message);
connection.publish(queueName, message,
{'replyTo': replyQueue.name});
});
}
function repSocket(connection, client, queueName) {
sys.log("rep socket opened");
if (queueName == '') {
client.send("Must send address for req");
client.end();
return;
}
var queue = connection.queue(queueName, {'durable': true,
'autoDelete': false});
var replyTo = '';
client.on('message', function (message) {
debug('reply:'); debug(message);
connection.publish(replyTo, message);
});
queue.subscribe(function(message) {
replyTo = message._properties.replyTo;
debug('request:'); debug(message);
client.send(message.data.toString());
});
client.on('close', function() {
queue.destroy();
queue.close();
});
}
function Pipe() {
var fore = this.fore = new EventEmitter(); // client --> server
var aft = this.aft = new EventEmitter(); // server --> client
aft.send = function (msg) {
debug('aft send:'); debug(msg);
fore.emit('message', msg);
};
fore.send = function (msg) {
debug('fore send:'); debug(msg);
aft.emit('message', msg);
};
aft.end = function() {
aft.emit('close');
}
fore.end = function() {
fore.emit('close');
}
fore.on('close', function () {
debug('fore close');
});
aft.on('close', function () {
debug('aft close');
});
}
function PipeServer() {
EventEmitter.call(this);
}
(function(S) {
var P = S.prototype = new EventEmitter();
P.connect = function() {
var p = new Pipe();
this.emit('connection', p.aft);
return p.fore;
}
})(PipeServer);
exports.Server = PipeServer;
exports.Pipe = Pipe;
function listen(server, allowed /* , callback */) {
var connection = amqp.createConnection({'host': '127.0.0.1', 'port': 5672});
var callback = (arguments.length > 2) ? arguments[2] : null;
connection.on('ready', function () {
server.on('connection', function (client) {
function dispatch(msg) {
client.removeListener('message', dispatch);
msg = msg.toString();
var i = msg.indexOf(' ');
var type = (i > -1) ? msg.substring(0, i) : msg;
var addr = (i > -1) ? msg.substr(i+1) : '';
if (check_rendezvous(type, addr, allowed)) {
switch (type) {
case 'pub':
pubSocket(connection, client, addr)
break;;
case 'sub':
subSocket(connection, client, addr);
break;
case 'push':
pushSocket(connection, client, addr);
break;
case 'pull':
pullSocket(connection, client, addr);
break;
case 'req':
reqSocket(connection, client, addr);
break;
case 'rep':
repSocket(connection, client, addr);
break;
default:
client.send("Unknown socket type");
client.end();
sys.log("Unknown socket type in: " + msg);
}
}
else {
client.send("Unauthorised rendezvous");
client.end();
sys.log("Access denied: " + type + " to " + addr);
}
}
client.on('message', dispatch);
});
if (callback) callback();
});
}
function check_rendezvous(type, addr, allowed) {
if (!allowed) return true; // no explicit list = everything goes
var socks = allowed[addr];
return socks && socks.indexOf(type) > -1
}
exports.listen = listen;