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<?php
/**
* @package Joomla.Platform
* @subpackage Session
*
* @copyright Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Memcache session storage handler for PHP
*
* -- Inspired in both design and implementation by the Horde memcache handler --
*
* @package Joomla.Platform
* @subpackage Session
* @see http://www.php.net/manual/en/function.session-set-save-handler.php
* @since 11.1
*/
class JSessionStorageMemcache extends JSessionStorage
{
/**
* Resource for the current memcached connection.
*
* @var resource
* @since 11.1
*/
private $_db;
/**
* Use compression?
*
* @var int
* @since 11.1
*/
private $_compress = null;
/**
* Use persistent connections
*
* @var boolean
* @since 11.1
*/
private $_persistent = false;
/**
* Constructor
*
* @param array $options Optional parameters.
*
* @since 11.1
*/
public function __construct($options = array())
{
if (!$this->test())
{
return JError::raiseError(404, JText::_('JLIB_SESSION_MEMCACHE_EXTENSION_NOT_AVAILABLE'));
}
parent::__construct($options);
$config = JFactory::getConfig();
$this->_compress = $config->get('memcache_compress', false)?MEMCACHE_COMPRESSED:false;
$this->_persistent = $config->get('memcache_persist', true);
// This will be an array of loveliness
// @todo: multiple servers
$this->_servers = array(
array(
'host' => $config->get('memcache_server_host', 'localhost'),
'port' => $config->get('memcache_server_port', 11211)
)
);
}
/**
* Open the SessionHandler backend.
*
* @param string $save_path The path to the session object.
* @param string $session_name The name of the session.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function open($save_path, $session_name)
{
$this->_db = new Memcache;
for ($i = 0, $n = count($this->_servers); $i < $n; $i++)
{
$server = $this->_servers[$i];
$this->_db->addServer($server['host'], $server['port'], $this->_persistent);
}
return true;
}
/**
* Close the SessionHandler backend.
*
* @return boolean True on success, false otherwise.
*/
public function close()
{
return $this->_db->close();
}
/**
* Read the data for a particular session identifier from the SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return string The session data.
*
* @since 11.1
*/
public function read($id)
{
$sess_id = 'sess_' . $id;
$this->_setExpire($sess_id);
return $this->_db->get($sess_id);
}
/**
* Write session data to the SessionHandler backend.
*
* @param string $id The session identifier.
* @param string $session_data The session data.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function write($id, $session_data)
{
$sess_id = 'sess_' . $id;
if ($this->_db->get($sess_id . '_expire'))
{
$this->_db->replace($sess_id . '_expire', time(), 0);
}
else
{
$this->_db->set($sess_id . '_expire', time(), 0);
}
if ($this->_db->get($sess_id))
{
$this->_db->replace($sess_id, $session_data, $this->_compress);
}
else
{
$this->_db->set($sess_id, $session_data, $this->_compress);
}
return;
}
/**
* Destroy the data for a particular session identifier in the SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function destroy($id)
{
$sess_id = 'sess_' . $id;
$this->_db->delete($sess_id . '_expire');
return $this->_db->delete($sess_id);
}
/**
* Test to see if the SessionHandler is available.
*
* @return boolean True on success, false otherwise.
*/
static public function test()
{
return (extension_loaded('memcache') && class_exists('Memcache'));
}
/**
* Set expire time on each call since memcache sets it on cache creation.
*
* @param string $key Cache key to expire.
*
* @return void
*
* @since 11.1
*/
protected function _setExpire($key)
{
$lifetime = ini_get("session.gc_maxlifetime");
$expire = $this->_db->get($key . '_expire');
// Set prune period
if ($expire + $lifetime < time())
{
$this->_db->delete($key);
$this->_db->delete($key . '_expire');
}
else
{
$this->_db->replace($key . '_expire', time());
}
}
}