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index.js
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index.js
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/**
* Module dependencies.
*/
var client = require('redis').createClient;
var parser = require('socket.io-parser');
var msgpack = require('notepack.io');
var debug = require('debug')('socket.io-emitter');
/**
* Module exports.
*/
module.exports = init;
/**
* Flags.
*
* @api public
*/
var flags = [
'json',
'volatile',
'broadcast'
];
/**
* uid for emitter
*
* @api private
*/
var uid = 'emitter';
/**
* Socket.IO redis based emitter.
*
* @param {Object} redis client (optional)
* @param {Object} options
* @api public
*/
function init(redis, opts){
opts = opts || {};
if ('string' == typeof redis) {
redis = client(redis);
}
if (redis && !redis.hset) {
opts = redis;
redis = null;
}
if (!redis) {
if (!opts.socket && !opts.host) throw new Error('Missing redis `host`');
if (!opts.socket && !opts.port) throw new Error('Missing redis `port`');
redis = opts.socket
? client(opts.socket)
: client(opts.port, opts.host);
}
var prefix = opts.key || 'socket.io';
return new Emitter(redis, prefix, '/');
}
function Emitter(redis, prefix, nsp){
this.redis = redis;
this.prefix = prefix;
this.nsp = nsp;
this.channel = this.prefix + '#' + nsp + '#';
this._rooms = [];
this._flags = {};
}
/**
* Apply flags from `Socket`.
*/
flags.forEach(function(flag){
Emitter.prototype.__defineGetter__(flag, function(){
debug('flag %s on', flag);
this._flags[flag] = true;
return this;
});
});
/**
* Limit emission to a certain `room`.
*
* @param {String} room
*/
Emitter.prototype.in =
Emitter.prototype.to = function(room){
if (!~this._rooms.indexOf(room)) {
debug('room %s', room);
this._rooms.push(room);
}
return this;
};
/**
* Return a new emitter for the given namespace.
*
* @param {String} namespace
*/
Emitter.prototype.of = function(nsp){
return new Emitter(this.redis, this.prefix, nsp);
};
/**
* Send the packet.
*
* @api public
*/
Emitter.prototype.emit = function(){
// packet
var args = Array.prototype.slice.call(arguments);
var packet = { type: parser.EVENT, data: args, nsp: this.nsp };
var opts = {
rooms: this._rooms,
flags: this._flags
};
var msg = msgpack.encode([uid, packet, opts]);
var channel = this.channel;
if (opts.rooms && opts.rooms.length === 1) {
channel += opts.rooms[0] + '#';
}
debug('publishing message to channel %s', channel);
this.redis.publish(channel, msg);
// reset state
this._rooms = [];
this._flags = {};
return this;
};