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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Joas Schilling <coding@schilljs.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Stefan Weil <sw@weilnetz.de>
*
* @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 <http://www.gnu.org/licenses/>
*
*/
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::$cache->delete($this->getNamespace() . $key)) {
return true;
} else {
return false;
}
}
public function clear($prefix = '') {
$prefix = $this->getNamespace() . $prefix . '*';
$it = null;
self::$cache->setOption(\Redis::OPT_SCAN, \Redis::SCAN_RETRY);
while ($keys = self::$cache->scan($it, $prefix)) {
self::$cache->delete($keys);
}
return true;
}
/**
* 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) ? false : true;
}
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) ? false : true;
}
self::$cache->unwatch();
return false;
}
public function setTTL($key, $ttl) {
self::$cache->expire($this->getNamespace() . $key, $ttl);
}
static public function isAvailable() {
return \OC::$server->getGetRedisFactory()->isAvailable();
}
}
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