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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 $memcached;
/**
* Time to live in seconds.
*/
private int|\Closure|null $ttl;
/**
* Key prefix for shared environments.
*/
private string $prefix;
/**
* Constructor.
*
* List of available options:
* * prefix: The prefix to use for the memcached keys in order to avoid collision
* * ttl: 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', 'ttl'])) {
throw new \InvalidArgumentException(sprintf('The following options are not supported "%s".', implode(', ', $diff)));
}
$this->ttl = $options['expiretime'] ?? $options['ttl'] ?? null;
$this->prefix = $options['prefix'] ?? 'sf2s';
}
public function close(): bool
{
return $this->memcached->quit();
}
protected function doRead(string $sessionId): string
{
return $this->memcached->get($this->prefix.$sessionId) ?: '';
}
public function updateTimestamp(string $sessionId, string $data): bool
{
$this->memcached->touch($this->prefix.$sessionId, $this->getCompatibleTtl());
return true;
}
protected function doWrite(string $sessionId, string $data): bool
{
return $this->memcached->set($this->prefix.$sessionId, $data, $this->getCompatibleTtl());
}
private function getCompatibleTtl(): int
{
$ttl = ($this->ttl instanceof \Closure ? ($this->ttl)() : $this->ttl) ?? \ini_get('session.gc_maxlifetime');
// If the relative TTL that is used exceeds 30 days, memcached will treat the value as Unix time.
// We have to convert it to an absolute Unix time at this point, to make sure the TTL is correct.
if ($ttl > 60 * 60 * 24 * 30) {
$ttl += time();
}
return $ttl;
}
protected function doDestroy(string $sessionId): bool
{
$result = $this->memcached->delete($this->prefix.$sessionId);
return $result || \Memcached::RES_NOTFOUND == $this->memcached->getResultCode();
}
public function gc(int $maxlifetime): int|false
{
// not required here because memcached will auto expire the records anyhow.
return 0;
}
/**
* Return a Memcached instance.
*/
protected function getMemcached(): \Memcached
{
return $this->memcached;
}
}
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