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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Memcache;
use OCP\HintException;
use OCP\IMemcache;
class Memcached extends Cache implements IMemcache {
use CASTrait;
/**
* @var \Memcached $cache
*/
private static $cache = null;
use CADTrait;
public function __construct($prefix = '') {
parent::__construct($prefix);
if (is_null(self::$cache)) {
self::$cache = new \Memcached();
$defaultOptions = [
\Memcached::OPT_CONNECT_TIMEOUT => 50,
\Memcached::OPT_RETRY_TIMEOUT => 50,
\Memcached::OPT_SEND_TIMEOUT => 50,
\Memcached::OPT_RECV_TIMEOUT => 50,
\Memcached::OPT_POLL_TIMEOUT => 50,
// Enable compression
\Memcached::OPT_COMPRESSION => true,
// Turn on consistent hashing
\Memcached::OPT_LIBKETAMA_COMPATIBLE => true,
// Enable Binary Protocol
\Memcached::OPT_BINARY_PROTOCOL => true,
];
/**
* By default enable igbinary serializer if available
*
* Psalm checks depend on if igbinary is installed or not with memcached
* @psalm-suppress RedundantCondition
* @psalm-suppress TypeDoesNotContainType
*/
if (\Memcached::HAVE_IGBINARY) {
$defaultOptions[\Memcached::OPT_SERIALIZER] =
\Memcached::SERIALIZER_IGBINARY;
}
$options = \OC::$server->getConfig()->getSystemValue('memcached_options', []);
if (is_array($options)) {
$options = $options + $defaultOptions;
self::$cache->setOptions($options);
} else {
throw new HintException("Expected 'memcached_options' config to be an array, got $options");
}
$servers = \OC::$server->getSystemConfig()->getValue('memcached_servers');
if (!$servers) {
$server = \OC::$server->getSystemConfig()->getValue('memcached_server');
if ($server) {
$servers = [$server];
} else {
$servers = [['localhost', 11211]];
}
}
self::$cache->addServers($servers);
}
}
/**
* entries in XCache gets 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 and self::$cache->getResultCode() == \Memcached::RES_NOTFOUND) {
return null;
} else {
return $result;
}
}
public function set($key, $value, $ttl = 0) {
if ($ttl > 0) {
$result = self::$cache->set($this->getNameSpace() . $key, $value, $ttl);
} else {
$result = self::$cache->set($this->getNameSpace() . $key, $value);
}
return $result || $this->isSuccess();
}
public function hasKey($key) {
self::$cache->get($this->getNameSpace() . $key);
return self::$cache->getResultCode() === \Memcached::RES_SUCCESS;
}
public function remove($key) {
$result = self::$cache->delete($this->getNameSpace() . $key);
return $result || $this->isSuccess() || self::$cache->getResultCode() === \Memcached::RES_NOTFOUND;
}
public function clear($prefix = '') {
// Newer Memcached doesn't like getAllKeys(), flush everything
self::$cache->flush();
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) {
$result = self::$cache->add($this->getPrefix() . $key, $value, $ttl);
return $result || $this->isSuccess();
}
/**
* Increase a stored number
*
* @param string $key
* @param int $step
* @return int | bool
*/
public function inc($key, $step = 1) {
$this->add($key, 0);
$result = self::$cache->increment($this->getPrefix() . $key, $step);
if (self::$cache->getResultCode() !== \Memcached::RES_SUCCESS) {
return false;
}
return $result;
}
/**
* Decrease a stored number
*
* @param string $key
* @param int $step
* @return int | bool
*/
public function dec($key, $step = 1) {
$result = self::$cache->decrement($this->getPrefix() . $key, $step);
if (self::$cache->getResultCode() !== \Memcached::RES_SUCCESS) {
return false;
}
return $result;
}
public static function isAvailable(): bool {
return extension_loaded('memcached');
}
private function isSuccess(): bool {
return self::$cache->getResultCode() === \Memcached::RES_SUCCESS;
}
}
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