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181 lines
4.4 KiB
181 lines
4.4 KiB
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Stefan Weil <sw@weilnetz.de>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Memcache;
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use OCP\IMemcacheTTL;
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class Redis extends Cache implements IMemcacheTTL {
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/**
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* @var \Redis $cache
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*/
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private static $cache = null;
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public function __construct($prefix = '') {
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parent::__construct($prefix);
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if (is_null(self::$cache)) {
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self::$cache = \OC::$server->getGetRedisFactory()->getInstance();
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}
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}
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/**
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* entries in redis get namespaced to prevent collisions between ownCloud instances and users
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*/
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protected function getNameSpace() {
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return $this->prefix;
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}
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public function get($key) {
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$result = self::$cache->get($this->getNameSpace() . $key);
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if ($result === false && !self::$cache->exists($this->getNameSpace() . $key)) {
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return null;
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} else {
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return json_decode($result, true);
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}
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}
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public function set($key, $value, $ttl = 0) {
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if ($ttl > 0) {
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return self::$cache->setex($this->getNameSpace() . $key, $ttl, json_encode($value));
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} else {
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return self::$cache->set($this->getNameSpace() . $key, json_encode($value));
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}
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}
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public function hasKey($key) {
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return self::$cache->exists($this->getNameSpace() . $key);
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}
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public function remove($key) {
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if (self::$cache->del($this->getNameSpace() . $key)) {
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return true;
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} else {
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return false;
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}
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}
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public function clear($prefix = '') {
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$prefix = $this->getNameSpace() . $prefix . '*';
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$keys = self::$cache->keys($prefix);
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$deleted = self::$cache->del($keys);
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return count($keys) === $deleted;
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}
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/**
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* Set a value in the cache if it's not already stored
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*
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* @param string $key
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* @param mixed $value
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* @param int $ttl Time To Live in seconds. Defaults to 60*60*24
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* @return bool
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*/
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public function add($key, $value, $ttl = 0) {
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// don't encode ints for inc/dec
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if (!is_int($value)) {
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$value = json_encode($value);
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}
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return self::$cache->setnx($this->getPrefix() . $key, $value);
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}
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/**
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* Increase a stored number
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*
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* @param string $key
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* @param int $step
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* @return int | bool
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*/
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public function inc($key, $step = 1) {
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return self::$cache->incrBy($this->getNameSpace() . $key, $step);
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}
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/**
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* Decrease a stored number
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*
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* @param string $key
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* @param int $step
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* @return int | bool
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*/
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public function dec($key, $step = 1) {
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if (!$this->hasKey($key)) {
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return false;
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}
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return self::$cache->decrBy($this->getNameSpace() . $key, $step);
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}
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/**
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* Compare and set
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*
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* @param string $key
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* @param mixed $old
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* @param mixed $new
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* @return bool
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*/
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public function cas($key, $old, $new) {
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if (!is_int($new)) {
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$new = json_encode($new);
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}
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self::$cache->watch($this->getNameSpace() . $key);
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if ($this->get($key) === $old) {
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$result = self::$cache->multi()
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->set($this->getNameSpace() . $key, $new)
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->exec();
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return $result !== false;
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}
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self::$cache->unwatch();
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return false;
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}
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/**
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* Compare and delete
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*
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* @param string $key
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* @param mixed $old
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* @return bool
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*/
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public function cad($key, $old) {
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self::$cache->watch($this->getNameSpace() . $key);
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if ($this->get($key) === $old) {
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$result = self::$cache->multi()
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->del($this->getNameSpace() . $key)
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->exec();
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return $result !== false;
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}
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self::$cache->unwatch();
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return false;
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}
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public function setTTL($key, $ttl) {
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self::$cache->expire($this->getNameSpace() . $key, $ttl);
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}
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public static function isAvailable() {
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return \OC::$server->getGetRedisFactory()->isAvailable();
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}
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}
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