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typo3/sysext/install/Classes/Service/ClearCacheService.php

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+<?php
+namespace TYPO3\CMS\Install\Service;
+
+/*
+ * 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!
+ */
+
+use TYPO3\CMS\Core\Core\Bootstrap;
+use TYPO3\CMS\Core\Core\Environment;
+use TYPO3\CMS\Core\Database\ConnectionPool;
+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
+{
+    /**
+     * 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.
+     *
+     * Therefor 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()
+    {
+        // Delete typo3temp/Cache
+        GeneralUtility::flushDirectory(Environment::getVarPath() . '/cache', true, true);
+
+        // Get all table names from Default connection starting with 'cf_' and truncate them
+        $connectionPool = GeneralUtility::makeInstance(ConnectionPool::class);
+        $connection = $connectionPool->getConnectionByName('Default');
+        $tableNames = $connection->getSchemaManager()->listTableNames();
+        foreach ($tableNames as $tableName) {
+            if (strpos($tableName, 'cf_') === 0 || $tableName === 'cache_treelist') {
+                $connection->truncate($tableName);
+            }
+        }
+
+        // check tables on other connections
+        $remappedTables = isset($GLOBALS['TYPO3_CONF_VARS']['DB']['TableMapping'])
+            ? array_keys((array)$GLOBALS['TYPO3_CONF_VARS']['DB']['TableMapping'])
+            : [];
+        foreach ($remappedTables as $tableName) {
+            if (strpos((string)$tableName, 'cf_') === 0 || $tableName === 'cache_treelist') {
+                $connectionPool->getConnectionForTable($tableName)->truncate($tableName);
+            }
+        }
+
+        // From this point on, the code may fatal, if some broken extension is loaded.
+
+        // Use bootstrap to load all ext_localconf and ext_tables
+        Bootstrap::loadTypo3LoadedExtAndExtLocalconf(false);
+        Bootstrap::unsetReservedGlobalVariables();
+        Bootstrap::loadBaseTca(false);
+        Bootstrap::loadExtTables(false);
+
+        // The cache manager is already instantiated in the install tool
+        // with some hacked settings to disable caching of extbase and fluid.
+        // We want a "fresh" object here to operate on a different cache setup.
+        // cacheManager implements SingletonInterface, so the only way to get a "fresh"
+        // instance is by circumventing makeInstance and/or the objectManager and
+        // using new directly!
+        $cacheManager = new \TYPO3\CMS\Core\Cache\CacheManager();
+        $cacheManager->setCacheConfigurations($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']);
+        $cacheManager->flushCaches();
+    }
+}