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index.js
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'use strict';
/**
* Module dependencies.
*/
var Client = require('mongodb').MongoClient,
uri = require('mongodb-uri'),
zlib = require('zlib'), noop = function () {};
/**
* Export `MongoStore`.
*/
exports = module.exports = {
create : function (args) {
return MongoStore(args);
}
};
/**
* MongoStore constructor.
*
* @param {Object} options
* @api public
*/
function MongoStore(args) {
if (!(this instanceof MongoStore)) {
return new MongoStore(args);
}
var store = this;
var conn = (args.uri) ? args.uri : args;
var options = (args.options) ? args.options : {};
store.MongoOptions = options;
store.name = 'mongodb';
if ('object' === typeof conn) {
if ('function' !== typeof conn.collection) {
var MongoOptions = conn.options;
if (Object.keys(MongoOptions).length === 0) {
conn = null;
} else if (MongoOptions.client) {
store.client = MongoOptions.client
} else {
store.MongoOptions.database = store.MongoOptions.database || store.MongoOptions.db;
store.MongoOptions.hosts = store.MongoOptions.hosts || [{
port : store.MongoOptions.port || 27017,
host : store.MongoOptions.host || '127.0.0.1'
}
];
store.MongoOptions.hosts = store.MongoOptions.hosts || 3600;
conn = uri.format(store.MongoOptions);
}
} else {
store.client = conn;
}
}
conn = conn || 'mongodb://127.0.0.1:27017';
store.coll = store.MongoOptions.collection || 'cacheman';
store.compression = store.MongoOptions.compression || false;
if ('string' === typeof conn) {
Client.connect(conn, store.MongoOptions, function getDb(err, db) {
store.client = db;
db.createCollection(store.coll, function (err, collection) {
store.collection = collection;
// Create an index on the a field
collection.createIndex('expiresAt', {
expiresAt : 1
}, {
unique : true,
background : true,
expireAfterSeconds : store.MongoOptions.ttl
}, function (err, indexName) {
if (err) {
console.log("Error During Indexes creation");
} else if ('function' === typeof args.createCollectionCallback){
args.createCollectionCallback(store);
}
});
});
});
}
/**
* Compress data value.
*
* @param {Object} data
* @param {Function} fn
* @api public
*/
store.compress = function compress(data, fn) {
// Data is not of a "compressable" type (currently only Buffer)
if (!Buffer.isBuffer(data.value)) {
return fn(null, data);
}
zlib.gzip(data.value, function (err, val) {
// If compression was successful, then use the compressed data.
// Otherwise, save the original data.
if (!err) {
data.value = val;
data.compressed = true;
}
fn(err, data);
});
};
/**
* Decompress data value.
*
* @param {Object} value
* @param {Function} fn
* @api public
*/
store.decompress = function decompress(value, fn) {
var v = (value.buffer && Buffer.isBuffer(value.buffer)) ? value.buffer : value;
zlib.gunzip(v, fn);
};
}
/**
* Get an entry.
*
* @param {String} key
* @param {Function} fn
* @api public
*/
MongoStore.prototype.get = function get(key, options, fn) {
if ('function' === typeof options) {
fn = options;
options = null;
}
fn = fn || noop;
var store = this;
store.collection.findOne({
key : key
}, function findOne(err, data) {
if (err) {
return fn(err);
}
if (!data) {
return fn(null, null);
}
if (data.expire < Date.now()) {
store.del(key);
return fn(null, null);
}
try {
if (data.compressed) {
return store.decompress(data.value, fn);
}
fn(null, data.value);
} catch (err) {
fn(err);
}
});
};
/**
* Set an entry.
*
* @param {String} key
* @param {Mixed} val
* @param {Number} ttl
* @param {Function} fn
* @api public
*/
MongoStore.prototype.set = function set(key, val, options, fn) {
if ('function' === typeof options) {
fn = options;
options = null;
}
fn = fn || noop;
var store = this;
var ttl = (options && (options.ttl || options.ttl === 0)) ? options.ttl : store.MongoOptions.ttl;
var data,
query = {
key : key
},
options = {
upsert : true,
safe : true
};
try {
data = {
key : key,
value : val,
expire : Date.now() + ((ttl || 60) * 1000)
};
} catch (err) {
return fn(err);
}
if (!store.compression) {
update(data);
} else {
store.compress(data, function compressData(err, data) {
if (err) {
return fn(err);
}
update(data);
});
}
function update(data) {
store.collection.update(query, data, options, function _update(err, data) {
if (err) {
return fn(err);
}
if (!data) {
return fn(null, null);
}
fn(null, val);
});
}
};
/**
* Delete an entry.
*
* @param {String} key
* @param {Function} fn
* @api public
*/
MongoStore.prototype.del = function del(key, options, fn) {
if (typeof options === 'function') {
fn = options;
}
var store = this;
fn = fn || noop;
store.collection.remove({
key : key
}, {
safe : true
}, fn);
};
/**
* Clear all entries for this bucket.
*
* @param {String} key
* @param {Function} fn
* @api public
*/
MongoStore.prototype.reset = function reset(key, fn) {
var store = this;
if ('function' === typeof key) {
fn = key;
key = null;
}
fn = fn || noop;
store.collection.remove({}, {
safe : true
}, fn);
};
MongoStore.prototype.isCacheableValue = function (value) {
return value !== null && value !== undefined;
};