* @author Jörn Friedrich Dreyer * @author Morris Jobke * @author Robin Appelman * @author Robin McCorkell * @author Roeland Jago Douma * @author Stefan Weil * * @license AGPL-3.0 * * This code is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License, version 3, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License, version 3, * along with this program. If not, see * */ namespace OC\Memcache; use OCP\IMemcacheTTL; class Redis extends Cache implements IMemcacheTTL { /** * @var \Redis $cache */ private static $cache = null; public function __construct($prefix = '') { parent::__construct($prefix); if (is_null(self::$cache)) { self::$cache = \OC::$server->getGetRedisFactory()->getInstance(); } } /** * entries in redis get namespaced to prevent collisions between ownCloud instances and users */ protected function getNameSpace() { return $this->prefix; } public function get($key) { $result = self::$cache->get($this->getNameSpace() . $key); if ($result === false && !self::$cache->exists($this->getNameSpace() . $key)) { return null; } else { return json_decode($result, true); } } public function set($key, $value, $ttl = 0) { if ($ttl > 0) { return self::$cache->setex($this->getNameSpace() . $key, $ttl, json_encode($value)); } else { return self::$cache->set($this->getNameSpace() . $key, json_encode($value)); } } public function hasKey($key) { return self::$cache->exists($this->getNameSpace() . $key); } public function remove($key) { if (self::$cache->del($this->getNameSpace() . $key)) { return true; } else { return false; } } public function clear($prefix = '') { $prefix = $this->getNameSpace() . $prefix . '*'; $keys = self::$cache->keys($prefix); $deleted = self::$cache->del($keys); return count($keys) === $deleted; } /** * Set a value in the cache if it's not already stored * * @param string $key * @param mixed $value * @param int $ttl Time To Live in seconds. Defaults to 60*60*24 * @return bool */ public function add($key, $value, $ttl = 0) { // don't encode ints for inc/dec if (!is_int($value)) { $value = json_encode($value); } return self::$cache->setnx($this->getPrefix() . $key, $value); } /** * Increase a stored number * * @param string $key * @param int $step * @return int | bool */ public function inc($key, $step = 1) { return self::$cache->incrBy($this->getNameSpace() . $key, $step); } /** * Decrease a stored number * * @param string $key * @param int $step * @return int | bool */ public function dec($key, $step = 1) { if (!$this->hasKey($key)) { return false; } return self::$cache->decrBy($this->getNameSpace() . $key, $step); } /** * Compare and set * * @param string $key * @param mixed $old * @param mixed $new * @return bool */ public function cas($key, $old, $new) { if (!is_int($new)) { $new = json_encode($new); } self::$cache->watch($this->getNameSpace() . $key); if ($this->get($key) === $old) { $result = self::$cache->multi() ->set($this->getNameSpace() . $key, $new) ->exec(); return $result !== false; } self::$cache->unwatch(); return false; } /** * Compare and delete * * @param string $key * @param mixed $old * @return bool */ public function cad($key, $old) { self::$cache->watch($this->getNameSpace() . $key); if ($this->get($key) === $old) { $result = self::$cache->multi() ->del($this->getNameSpace() . $key) ->exec(); return $result !== false; } self::$cache->unwatch(); return false; } public function setTTL($key, $ttl) { self::$cache->expire($this->getNameSpace() . $key, $ttl); } public static function isAvailable() { return \OC::$server->getGetRedisFactory()->isAvailable(); } }