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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* 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;
/**
* Memcached based session storage handler based on the Memcached class
* provided by the PHP memcached extension.
*
* @see https://php.net/memcached
*
* @author Drak <drak@zikula.org>
*/
class MemcachedSessionHandler extends AbstractSessionHandler
{
private $memcached;
/**
* @var int Time to live in seconds
*/
private $ttl;
/**
* @var string Key prefix for shared environments
*/
private $prefix;
/**
* Constructor.
*
* List of available options:
* * prefix: The prefix to use for the memcached keys in order to avoid collision
* * expiretime: The time to live in seconds.
*
* @throws \InvalidArgumentException When unsupported options are passed
*/
public function __construct(\Memcached $memcached, array $options = [])
{
$this->memcached = $memcached;
if ($diff = array_diff(array_keys($options), ['prefix', 'expiretime'])) {
throw new \InvalidArgumentException(sprintf('The following options are not supported "%s".', implode(', ', $diff)));
}
$this->ttl = isset($options['expiretime']) ? (int) $options['expiretime'] : 86400;
$this->prefix = $options['prefix'] ?? 'sf2s';
}
/**
* @return bool
*/
public function close()
{
return $this->memcached->quit();
}
/**
* {@inheritdoc}
*/
protected function doRead(string $sessionId)
{
return $this->memcached->get($this->prefix.$sessionId) ?: '';
}
/**
* @return bool
*/
public function updateTimestamp($sessionId, $data)
{
$this->memcached->touch($this->prefix.$sessionId, time() + $this->ttl);
return true;
}
/**
* {@inheritdoc}
*/
protected function doWrite(string $sessionId, string $data)
{
return $this->memcached->set($this->prefix.$sessionId, $data, time() + $this->ttl);
}
/**
* {@inheritdoc}
*/
protected function doDestroy(string $sessionId)
{
$result = $this->memcached->delete($this->prefix.$sessionId);
return $result || \Memcached::RES_NOTFOUND == $this->memcached->getResultCode();
}
/**
* @return bool
*/
public function gc($maxlifetime)
{
// not required here because memcached will auto expire the records anyhow.
return true;
}
/**
* Return a Memcached instance.
*
* @return \Memcached
*/
protected function getMemcached()
{
return $this->memcached;
}
}