<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
/**
* MongoDB session handler.
*
* @author Markus Bachmann <[email protected]>
*/
class MongoDbSessionHandler implements \SessionHandlerInterface
{
/**
* @var \Mongo
*/
private $mongo;
/**
* @var \MongoCollection
*/
private $collection;
/**
* @var array
*/
private $options;
/**
* Constructor.
*
* List of available options:
* * database: The name of the database [required]
* * collection: The name of the collection [required]
* * id_field: The field name for storing the session id [default: _id]
* * data_field: The field name for storing the session data [default: data]
* * time_field: The field name for storing the timestamp [default: time]
* * expiry_field: The field name for storing the expiry-timestamp [default: expires_at]
*
* It is strongly recommended to put an index on the `expiry_field` for
* garbage-collection. Alternatively it's possible to automatically expire
* the sessions in the database as described below:
*
* A TTL collections can be used on MongoDB 2.2+ to cleanup expired sessions
* automatically. Such an index can for example look like this:
*
* db.<session-collection>.ensureIndex(
* { "<expiry-field>": 1 },
* { "expireAfterSeconds": 0 }
* )
*
* More details on: http://docs.mongodb.org/manual/tutorial/expire-data/
*
* If you use such an index, you can drop `gc_probability` to 0 since
* no garbage-collection is required.
*
* @param \Mongo|\MongoClient $mongo A MongoClient or Mongo instance
* @param array $options An associative array of field options
*
* @throws \InvalidArgumentException When MongoClient or Mongo instance not provided
* @throws \InvalidArgumentException When "database" or "collection" not provided
*/
public function __construct($mongo, array $options)
{
if (!($mongo instanceof \MongoClient || $mongo instanceof \Mongo)) {
throw new \InvalidArgumentException('MongoClient or Mongo instance required');
}
if (!isset($options['database']) || !isset($options['collection'])) {
throw new \InvalidArgumentException('You must provide the "database" and "collection" option for MongoDBSessionHandler');
}
$this->mongo = $mongo;
$this->options = array_merge(array(
'id_field' => '_id',
'data_field' => 'data',
'time_field' => 'time',
'expiry_field' => 'expires_at',
), $options);
}
/**
* {@inheritdoc}
*/
public function open($savePath, $sessionName)
{
return true;
}
/**
* {@inheritdoc}
*/
public function close()
{
return true;
}
/**
* {@inheritdoc}
*/
public function destroy($sessionId)
{
$this->getCollection()->remove(array(
$this->options['id_field'] => $sessionId,
));
return true;
}
/**
* {@inheritdoc}
*/
public function gc($maxlifetime)
{
$this->getCollection()->remove(array(
$this->options['expiry_field'] => array('$lt' => new \MongoDate()),
));
return true;
}
/**
* {@inheritdoc}
*/
public function write($sessionId, $data)
{
$expiry = new \MongoDate(time() + (int) ini_get('session.gc_maxlifetime'));
$fields = array(
$this->options['data_field'] => new \MongoBinData($data, \MongoBinData::BYTE_ARRAY),
$this->options['time_field'] => new \MongoDate(),
$this->options['expiry_field'] => $expiry,
);
$this->getCollection()->update(
array($this->options['id_field'] => $sessionId),
array('$set' => $fields),
array('upsert' => true, 'multiple' => false)
);
return true;
}
/**
* {@inheritdoc}
*/
public function read($sessionId)
{
$dbData = $this->getCollection()->findOne(array(
$this->options['id_field'] => $sessionId,
$this->options['expiry_field'] => array('$gte' => new \MongoDate()),
));
return null === $dbData ? '' : $dbData[$this->options['data_field']]->bin;
}
/**
* Return a "MongoCollection" instance.
*
* @return \MongoCollection
*/
private function getCollection()
{
if (null === $this->collection) {
$this->collection = $this->mongo->selectCollection($this->options['database'], $this->options['collection']);
}
return $this->collection;
}
/**
* Return a Mongo instance.
*
* @return \Mongo
*/
protected function getMongo()
{
return $this->mongo;
}
}