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<?php
/**
* Copyright (c) 2014 Jörn Friedrich Dreyer <jfd@butonic.de>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\Memcache;
class Redis extends Cache {
/**
* @var \Redis $cache
*/
private static $cache = null;
public function __construct($prefix = '') {
parent::__construct($prefix);
if (is_null(self::$cache)) {
// TODO allow configuring a RedisArray, see https://github.com/nicolasff/phpredis/blob/master/arrays.markdown#redis-arrays
self::$cache = new \Redis();
$config = \OC::$server->getSystemConfig()->getValue('redis', array());
if (isset($config['host'])) {
$host = $config['host'];
} else {
$host = '127.0.0.1';
}
if (isset($config['port'])) {
$port = $config['port'];
} else {
$port = 6379;
}
if (isset($config['timeout'])) {
$timeout = $config['timeout'];
} else {
$timeout = 0.0; // unlimited
}
self::$cache->connect( $host, $port, $timeout );
}
}
/**
* 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;
}
static public function isAvailable() {
return extension_loaded('redis');
}
}
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