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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\Cache\CappedMemoryCache;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IMemcache;
use OCP\Profiler\IProfiler;
use Psr\Log\LoggerInterface;
class Factory implements ICacheFactory {
public const NULL_CACHE = NullCache::class;
private string $globalPrefix;
private LoggerInterface $logger;
/**
* @var ?class-string<ICache> $localCacheClass
*/
private ?string $localCacheClass;
/**
* @var ?class-string<ICache> $distributedCacheClass
*/
private ?string $distributedCacheClass;
/**
* @var ?class-string<IMemcache> $lockingCacheClass
*/
private ?string $lockingCacheClass;
private string $logFile;
private IProfiler $profiler;
/**
* @param string $globalPrefix
* @param LoggerInterface $logger
* @param ?class-string<ICache> $localCacheClass
* @param ?class-string<ICache> $distributedCacheClass
* @param ?class-string<IMemcache> $lockingCacheClass
* @param string $logFile
*/
public function __construct(string $globalPrefix, LoggerInterface $logger, IProfiler $profiler,
?string $localCacheClass = null, ?string $distributedCacheClass = null, ?string $lockingCacheClass = null, string $logFile = '') {
$this->logFile = $logFile;
$this->globalPrefix = $globalPrefix;
if (!$localCacheClass) {
$localCacheClass = self::NULL_CACHE;
}
$localCacheClass = ltrim($localCacheClass, '\\');
if (!$distributedCacheClass) {
$distributedCacheClass = $localCacheClass;
}
$distributedCacheClass = ltrim($distributedCacheClass, '\\');
$missingCacheMessage = 'Memcache {class} not available for {use} cache';
$missingCacheHint = 'Is the matching PHP module installed and enabled?';
if (!class_exists($localCacheClass) || !$localCacheClass::isAvailable()) {
throw new \OCP\HintException(strtr($missingCacheMessage, [
'{class}' => $localCacheClass, '{use}' => 'local'
]), $missingCacheHint);
}
if (!class_exists($distributedCacheClass) || !$distributedCacheClass::isAvailable()) {
throw new \OCP\HintException(strtr($missingCacheMessage, [
'{class}' => $distributedCacheClass, '{use}' => 'distributed'
]), $missingCacheHint);
}
if (!($lockingCacheClass && class_exists($lockingCacheClass) && $lockingCacheClass::isAvailable())) {
// don't fall back since the fallback might not be suitable for storing lock
$lockingCacheClass = self::NULL_CACHE;
}
$lockingCacheClass = ltrim($lockingCacheClass, '\\');
$this->localCacheClass = $localCacheClass;
$this->distributedCacheClass = $distributedCacheClass;
$this->lockingCacheClass = $lockingCacheClass;
$this->profiler = $profiler;
}
/**
* create a cache instance for storing locks
*
* @param string $prefix
* @return IMemcache
*/
public function createLocking(string $prefix = ''): IMemcache {
assert($this->lockingCacheClass !== null);
$cache = new $this->lockingCacheClass($this->globalPrefix . '/' . $prefix);
if ($this->lockingCacheClass === Redis::class && $this->profiler->isEnabled()) {
// We only support the profiler with Redis
$cache = new ProfilerWrapperCache($cache, 'Locking');
$this->profiler->add($cache);
}
if ($this->lockingCacheClass === Redis::class &&
$this->logFile !== '' && is_writable(dirname($this->logFile)) && (!file_exists($this->logFile) || is_writable($this->logFile))) {
$cache = new LoggerWrapperCache($cache, $this->logFile);
}
return $cache;
}
/**
* create a distributed cache instance
*
* @param string $prefix
* @return ICache
*/
public function createDistributed(string $prefix = ''): ICache {
assert($this->distributedCacheClass !== null);
$cache = new $this->distributedCacheClass($this->globalPrefix . '/' . $prefix);
if ($this->distributedCacheClass === Redis::class && $this->profiler->isEnabled()) {
// We only support the profiler with Redis
$cache = new ProfilerWrapperCache($cache, 'Distributed');
$this->profiler->add($cache);
}
if ($this->distributedCacheClass === Redis::class && $this->logFile !== ''
&& is_writable(dirname($this->logFile)) && (!file_exists($this->logFile) || is_writable($this->logFile))) {
$cache = new LoggerWrapperCache($cache, $this->logFile);
}
return $cache;
}
/**
* create a local cache instance
*
* @param string $prefix
* @return ICache
*/
public function createLocal(string $prefix = ''): ICache {
assert($this->localCacheClass !== null);
$cache = new $this->localCacheClass($this->globalPrefix . '/' . $prefix);
if ($this->localCacheClass === Redis::class && $this->profiler->isEnabled()) {
// We only support the profiler with Redis
$cache = new ProfilerWrapperCache($cache, 'Local');
$this->profiler->add($cache);
}
if ($this->localCacheClass === Redis::class && $this->logFile !== ''
&& is_writable(dirname($this->logFile)) && (!file_exists($this->logFile) || is_writable($this->logFile))) {
$cache = new LoggerWrapperCache($cache, $this->logFile);
}
return $cache;
}
/**
* check memcache availability
*
* @return bool
*/
public function isAvailable(): bool {
return $this->distributedCacheClass !== self::NULL_CACHE;
}
public function createInMemory(int $capacity = 512): ICache {
return new CappedMemoryCache($capacity);
}
/**
* Check if a local memory cache backend is available
*
* @return bool
*/
public function isLocalCacheAvailable(): bool {
return $this->localCacheClass !== self::NULL_CACHE;
}
}
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