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<?php
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Install\Service;
use TYPO3\CMS\Core\Cache\CacheManager;
use TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\DependencyInjection\Cache\ContainerBackend;
use TYPO3\CMS\Core\Utility\GeneralUtility;
/**
* Basic service to clear caches within the install tool.
* @internal This is NOT an API class, it is for internal use in the install tool only.
*/
class ClearCacheService
{
private const legacyDatabaseCacheTables = [
'cache_treelist',
];
/**
* @var LateBootService
*/
private $lateBootService;
/**
* @var FrontendInterface
*/
private $dependencyInjectionCache;
public function __construct(
LateBootService $lateBootService,
FrontendInterface $dependencyInjectionCache
) {
$this->lateBootService = $lateBootService;
$this->dependencyInjectionCache = $dependencyInjectionCache;
}
/**
* This clear cache implementation follows a pretty brutal approach.
* Goal is to reliably get rid of cache entries, even if some broken
* extension is loaded that would kill the backend 'clear cache' action.
*
* Therefore this method "knows" implementation details of the cache
* framework and uses them to clear all file based cache (typo3temp/Cache)
* and database caches (tables prefixed with cf_) manually.
*
* After that ext_tables and ext_localconf of extensions are loaded, those
* may register additional caches in the caching framework with different
* backend, and will then clear them with the usual flush() method.
*/
public function clearAll(): void
{
// Low level flush of legacy database cache tables
$connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
foreach (self::legacyDatabaseCacheTables as $tableName) {
$connection = $connectionPool->getConnectionForTable($tableName);
if ($connection->createSchemaManager()->tablesExist($tableName)) {
$connection->truncate($tableName);
}
}
// Flush all caches defined in TYPO3_CONF_VARS, but not the ones defined by extensions in ext_localconf.php
$baseCaches = $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'] ?? [];
$this->flushCaches($baseCaches);
// Remove DI container cache (this might be removed in preference of functionality to rebuild this cache)
if ($this->dependencyInjectionCache->getBackend() instanceof ContainerBackend) {
/** @var ContainerBackend $diCacheBackend */
$diCacheBackend = $this->dependencyInjectionCache->getBackend();
// We need to remove using the forceFlush method because the DI cache backend disables the flush method
$diCacheBackend->forceFlush();
}
// From this point on, the code may fatal, if some broken extension is loaded.
$this->lateBootService->loadExtLocalconfDatabaseAndExtTables();
$extensionCaches = $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations'] ?? [];
// Loose comparison on purpose to allow changed ordering of the array
if ($baseCaches != $extensionCaches) {
// When configuration has changed during loading of extensions (due to ext_localconf.php), flush all caches again
$this->flushCaches($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']);
}
}
/**
* The cache manager is already instantiated in the install tool
* (both in the failsafe and the late boot container), but
* with settings to disable caching (all caches using NullBackend).
* We want a "fresh" object here to operate with the really configured cache backends.
* CacheManager implements SingletonInterface, so the only way to get a "fresh"
* instance is by circumventing makeInstance and using new directly!
*/
private function flushCaches(array $cacheConfiguration): void
{
$cacheManager = new CacheManager();
$cacheManager->setCacheConfigurations($cacheConfiguration);
$cacheManager->flushCaches();
}
}