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/*!
* socket.io-node
* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var crypto = require('crypto')
, Store = require('../store')
, assert = require('assert');
/**
* Exports the constructor.
*/
exports = module.exports = Redis;
Redis.Client = Client;
/**
* Redis store.
* Options:
* - nodeId (fn) gets an id that uniquely identifies this node
* - redis (fn) redis constructor, defaults to redis
* - redisPub (object) options to pass to the pub redis client
* - redisSub (object) options to pass to the sub redis client
* - redisClient (object) options to pass to the general redis client
* - pack (fn) custom packing, defaults to JSON or msgpack if installed
* - unpack (fn) custom packing, defaults to JSON or msgpack if installed
*
* @api public
*/
function Redis (opts) {
opts = opts || {};
// node id to uniquely identify this node
var nodeId = opts.nodeId || function () {
// by default, we generate a random id
return Math.abs(Math.random() * Math.random() * Date.now() | 0);
};
this.nodeId = nodeId();
// packing / unpacking mechanism
if (opts.pack) {
this.pack = opts.pack;
this.unpack = opts.unpack;
} else {
try {
var msgpack = require('msgpack');
this.pack = msgpack.pack;
this.unpack = msgpack.unpack;
} catch (e) {
this.pack = JSON.stringify;
this.unpack = JSON.parse;
}
}
var redis = opts.redis || require('redis')
, RedisClient = redis.RedisClient;
// initialize a pubsub client and a regular client
if (opts.redisPub instanceof RedisClient) {
this.pub = opts.redisPub;
} else {
opts.redisPub || (opts.redisPub = {});
this.pub = redis.createClient(opts.redisPub.port, opts.redisPub.host, opts.redisPub);
}
if (opts.redisSub instanceof RedisClient) {
this.sub = opts.redisSub;
} else {
opts.redisSub || (opts.redisSub = {});
this.sub = redis.createClient(opts.redisSub.port, opts.redisSub.host, opts.redisSub);
}
if (opts.redisClient instanceof RedisClient) {
this.cmd = opts.redisClient;
} else {
opts.redisClient || (opts.redisClient = {});
this.cmd = redis.createClient(opts.redisClient.port, opts.redisClient.host, opts.redisClient);
}
Store.call(this, opts);
this.sub.setMaxListeners(0);
this.setMaxListeners(0);
};
/**
* Inherits from Store.
*/
Redis.prototype.__proto__ = Store.prototype;
/**
* Publishes a message.
*
* @api private
*/
Redis.prototype.publish = function (name) {
var args = Array.prototype.slice.call(arguments, 1);
this.pub.publish(name, this.pack({ nodeId: this.nodeId, args: args }));
this.emit.apply(this, ['publish', name].concat(args));
};
/**
* Subscribes to a channel
*
* @api private
*/
Redis.prototype.subscribe = function (name, consumer, fn) {
this.sub.subscribe(name);
if (consumer || fn) {
var self = this;
self.sub.on('subscribe', function subscribe (ch) {
if (name == ch) {
function message (ch, msg) {
if (name == ch) {
msg = self.unpack(msg);
// we check that the message consumed wasnt emitted by this node
if (self.nodeId != msg.nodeId) {
consumer.apply(null, msg.args);
}
}
};
self.sub.on('message', message);
self.on('unsubscribe', function unsubscribe (ch) {
if (name == ch) {
self.sub.removeListener('message', message);
self.removeListener('unsubscribe', unsubscribe);
}
});
self.sub.removeListener('subscribe', subscribe);
fn && fn();
}
});
}
this.emit('subscribe', name, consumer, fn);
};
/**
* Unsubscribes
*
* @api private
*/
Redis.prototype.unsubscribe = function (name, fn) {
this.sub.unsubscribe(name);
if (fn) {
var client = this.sub;
client.on('unsubscribe', function unsubscribe (ch) {
if (name == ch) {
fn();
client.removeListener('unsubscribe', unsubscribe);
}
});
}
this.emit('unsubscribe', name, fn);
};
/**
* Destroys the store
*
* @api public
*/
Redis.prototype.destroy = function () {
Store.prototype.destroy.call(this);
this.pub.end();
this.sub.end();
this.cmd.end();
};
/**
* Client constructor
*
* @api private
*/
function Client (store, id) {
Store.Client.call(this, store, id);
};
/**
* Inherits from Store.Client
*/
Client.prototype.__proto__ = Store.Client;
/**
* Redis hash get
*
* @api private
*/
Client.prototype.get = function (key, fn) {
this.store.cmd.hget(this.id, key, fn);
return this;
};
/**
* Redis hash set
*
* @api private
*/
Client.prototype.set = function (key, value, fn) {
this.store.cmd.hset(this.id, key, value, fn);
return this;
};
/**
* Redis hash del
*
* @api private
*/
Client.prototype.del = function (key, fn) {
this.store.cmd.hdel(this.id, key, fn);
return this;
};
/**
* Redis hash has
*
* @api private
*/
Client.prototype.has = function (key, fn) {
this.store.cmd.hexists(this.id, key, function (err, has) {
if (err) return fn(err);
fn(null, !!has);
});
return this;
};
/**
* Destroys client
*
* @param {Number} number of seconds to expire data
* @api private
*/
Client.prototype.destroy = function (expiration) {
if ('number' != typeof expiration) {
this.store.cmd.del(this.id);
} else {
this.store.cmd.expire(this.id, expiration);
}
return this;
};
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