connect-mongoskin/index.js

Connect's durable sessions middleware backed by MongoSkin

/*!
 * connect-mongoskin
 * Copyright(c) 2012 Johnny Halife <johnny@mural.ly>
 * Mantained by Mural.ly Team <dev@mural.ly>
 */
var Store = require('connect').session.Store,
		util = require('util');

/**
 * Connect Framework Middleware abstraction for
 * using it with MongoSkin (https://github.com/kissjs/node-mongoskin)
 *
 * @param {SkingDb}		skinDb
 * @param {*=}				options
 * @param {Function}	callback
 */
module.exports = SkinStore = function (skinDb, options, callback) {
	if(!skinDb) throw(new Error('You must provide a `db` (SkinDb object)'));

	this.db = skinDb;
	this.sessions = this.db.collection('sessions_');
  this.sessions.ensureIndex({expires: 1}, {expireAfterSeconds: 0}, function() {});

	Store.call(this, options);
};

/** SkinStore extendes Store from Connect */
util.inherits(SkinStore, Store);

/**
 * Gets a session row from the persistance store
 *
 * @param  {string}   sid
 * @param  {Function} callback
 */
SkinStore.prototype.get = function (sid, callback) {
	this.sessions.findOne({_id: sid }, function (err, row) {
		if(err || !row) return callback(err, row);

		var session = typeof row.session === 'string' ? JSON.parse(row.session) : row.session;
		callback(null, session);
	});
};

/**
 * Stores a session row on the persistance store.
 *
 * @param {string}		sid
 * @param {*}					session
 * @param {Function}	callback
 */
SkinStore.prototype.set = function (sid, session, callback) {
	var values = {_id: sid, session: JSON.stringify(session) };

	if(session && session.cookie && session.cookie.expires) {
		values.expires = new Date(session.cookie.expires);
	}

	this.sessions.update({_id: sid}, values, {upsert: true}, function () {
		callback.apply(this, arguments);
	});
};

/**
 * Destroys a session from the persistance store.
 *
 * @param  {string}   sid
 * @param  {Function} callback
 */
SkinStore.prototype.destroy = function (sid, callback) {
	this.sessions.remove({_id: sid}, {safe: false}, callback);
};

/**
 * Wipes out the persitance store.
 *
 * @param  {Function} callback
 */
SkinStore.prototype.clear = function (callback) {
	this.sessions.drop(callback);
};

/**
 * Returns the number of sessions currently available
 * on the persitance store.
 *
 * @param  {Function} callback
 */
SkinStore.prototype.count = function (callback) {
	this.sessions.count(callback);
};