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MemcachedSessionHandler.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
013
014 /**
015 * Memcached based session storage handler based on the Memcached class
016 * provided by the PHP memcached extension.
017 *
018 * @see https://php.net/memcached
019 *
020 * @author Drak <drak@zikula.org>
021 */
022 class MemcachedSessionHandler extends AbstractSessionHandler
023 {
024 private $memcached;
025
026 /**
027 * @var int Time to live in seconds
028 */
029 private $ttl;
030
031 /**
032 * @var string Key prefix for shared environments
033 */
034 private $prefix;
035
036 /**
037 * Constructor.
038 *
039 * List of available options:
040 * * prefix: The prefix to use for the memcached keys in order to avoid collision
041 * * expiretime: The time to live in seconds.
042 *
043 * @throws \InvalidArgumentException When unsupported options are passed
044 */
045 public function __construct(\Memcached $memcached, array $options = [])
046 {
047 $this->memcached = $memcached;
048
049 if ($diff = array_diff(array_keys($options), ['prefix', 'expiretime'])) {
050 throw new \InvalidArgumentException(sprintf('The following options are not supported "%s".', implode(', ', $diff)));
051 }
052
053 $this->ttl = isset($options['expiretime']) ? (int) $options['expiretime'] : 86400;
054 $this->prefix = isset($options['prefix']) ? $options['prefix'] : 'sf2s';
055 }
056
057 /**
058 * @return bool
059 */
060 public function close()
061 {
062 return $this->memcached->quit();
063 }
064
065 /**
066 * {@inheritdoc}
067 */
068 protected function doRead($sessionId)
069 {
070 return $this->memcached->get($this->prefix.$sessionId) ?: '';
071 }
072
073 /**
074 * @return bool
075 */
076 public function updateTimestamp($sessionId, $data)
077 {
078 $this->memcached->touch($this->prefix.$sessionId, time() + $this->ttl);
079
080 return true;
081 }
082
083 /**
084 * {@inheritdoc}
085 */
086 protected function doWrite($sessionId, $data)
087 {
088 return $this->memcached->set($this->prefix.$sessionId, $data, time() + $this->ttl);
089 }
090
091 /**
092 * {@inheritdoc}
093 */
094 protected function doDestroy($sessionId)
095 {
096 $result = $this->memcached->delete($this->prefix.$sessionId);
097
098 return $result || \Memcached::RES_NOTFOUND == $this->memcached->getResultCode();
099 }
100
101 /**
102 * @return bool
103 */
104 public function gc($maxlifetime)
105 {
106 // not required here because memcached will auto expire the records anyhow.
107 return true;
108 }
109
110 /**
111 * Return a Memcached instance.
112 *
113 * @return \Memcached
114 */
115 protected function getMemcached()
116 {
117 return $this->memcached;
118 }
119 }
120