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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Cache\Traits; use Psr\Log\LoggerAwareTrait; use Symfony\Component\Cache\CacheItem; /** * @author Nicolas Grekas <p@tchwork.com> * * @internal */ trait AbstractTrait { use LoggerAwareTrait; private $namespace; private $namespaceVersion = ''; private $versioningIsEnabled = false; private $deferred = []; private $ids = []; /** * @var int|null The maximum length to enforce for identifiers or null when no limit applies */ protected $maxIdLength; /** * Fetches several cache items. * * @param array $ids The cache identifiers to fetch * * @return array|\Traversable The corresponding values found in the cache */ abstract protected function doFetch(array $ids); /** * Confirms if the cache contains specified cache item. * * @param string $id The identifier for which to check existence * * @return bool True if item exists in the cache, false otherwise */ abstract protected function doHave($id); /** * Deletes all items in the pool. * * @param string $namespace The prefix used for all identifiers managed by this pool * * @return bool True if the pool was successfully cleared, false otherwise */ abstract protected function doClear($namespace); /** * Removes multiple items from the pool. * * @param array $ids An array of identifiers that should be removed from the pool * * @return bool True if the items were successfully removed, false otherwise */ abstract protected function doDelete(array $ids); /** * Persists several cache items immediately. * * @param array $values The values to cache, indexed by their cache identifier * @param int $lifetime The lifetime of the cached values, 0 for persisting until manual cleaning * * @return array|bool The identifiers that failed to be cached or a boolean stating if caching succeeded or not */ abstract protected function doSave(array $values, $lifetime); /** * {@inheritdoc} * * @return bool */ public function hasItem($key) { $id = $this->getId($key); if (isset($this->deferred[$key])) { $this->commit(); } try { return $this->doHave($id); } catch (\Exception $e) { CacheItem::log($this->logger, 'Failed to check if key "{key}" is cached: '.$e->getMessage(), ['key' => $key, 'exception' => $e]); return false; } } /** * {@inheritdoc} * * @param string $prefix * * @return bool */ public function clear(/*string $prefix = ''*/) { $this->deferred = []; if ($cleared = $this->versioningIsEnabled) { if ('' === $namespaceVersionToClear = $this->namespaceVersion) { foreach ($this->doFetch([static::NS_SEPARATOR.$this->namespace]) as $v) { $namespaceVersionToClear = $v; } } $namespaceToClear = $this->namespace.$namespaceVersionToClear; $namespaceVersion = substr_replace(base64_encode(pack('V', mt_rand())), static::NS_SEPARATOR, 5); try { $cleared = $this->doSave([static::NS_SEPARATOR.$this->namespace => $namespaceVersion], 0); } catch (\Exception $e) { $cleared = false; } if ($cleared = true === $cleared || [] === $cleared) { $this->namespaceVersion = $namespaceVersion; $this->ids = []; } } else { $prefix = 0 < \func_num_args() ? (string) func_get_arg(0) : ''; $namespaceToClear = $this->namespace.$prefix; } try { return $this->doClear($namespaceToClear) || $cleared; } catch (\Exception $e) { CacheItem::log($this->logger, 'Failed to clear the cache: '.$e->getMessage(), ['exception' => $e]); return false; } } /** * {@inheritdoc} * * @return bool */ public function deleteItem($key) { return $this->deleteItems([$key]); } /** * {@inheritdoc} * * @return bool */ public function deleteItems(array $keys) { $ids = []; foreach ($keys as $key) { $ids[$key] = $this->getId($key); unset($this->deferred[$key]); } try { if ($this->doDelete($ids)) { return true; } } catch (\Exception $e) { } $ok = true; // When bulk-delete failed, retry each item individually foreach ($ids as $key => $id) { try { $e = null; if ($this->doDelete([$id])) { continue; } } catch (\Exception $e) { } $message = 'Failed to delete key "{key}"'.($e instanceof \Exception ? ': '.$e->getMessage() : '.'); CacheItem::log($this->logger, $message, ['key' => $key, 'exception' => $e]); $ok = false; } return $ok; } /** * Enables/disables versioning of items. * * When versioning is enabled, clearing the cache is atomic and doesn't require listing existing keys to proceed, * but old keys may need garbage collection and extra round-trips to the back-end are required. * * Calling this method also clears the memoized namespace version and thus forces a resynchonization of it. * * @param bool $enable * * @return bool the previous state of versioning */ public function enableVersioning($enable = true) { $wasEnabled = $this->versioningIsEnabled; $this->versioningIsEnabled = (bool) $enable; $this->namespaceVersion = ''; $this->ids = []; return $wasEnabled; } /** * {@inheritdoc} */ public function reset() { if ($this->deferred) { $this->commit(); } $this->namespaceVersion = ''; $this->ids = []; } /** * Like the native unserialize() function but throws an exception if anything goes wrong. * * @param string $value * * @return mixed * * @throws \Exception * * @deprecated since Symfony 4.2, use DefaultMarshaller instead. */ protected static function unserialize($value) { @trigger_error(sprintf('The "%s::unserialize()" method is deprecated since Symfony 4.2, use DefaultMarshaller instead.', __CLASS__), E_USER_DEPRECATED); if ('b:0;' === $value) { return false; } $unserializeCallbackHandler = ini_set('unserialize_callback_func', __CLASS__.'::handleUnserializeCallback'); try { if (false !== $value = unserialize($value)) { return $value; } throw new \DomainException('Failed to unserialize cached value'); } catch (\Error $e) { throw new \ErrorException($e->getMessage(), $e->getCode(), E_ERROR, $e->getFile(), $e->getLine()); } finally { ini_set('unserialize_callback_func', $unserializeCallbackHandler); } } private function getId($key): string { if ($this->versioningIsEnabled && '' === $this->namespaceVersion) { $this->ids = []; $this->namespaceVersion = '1'.static::NS_SEPARATOR; try { foreach ($this->doFetch([static::NS_SEPARATOR.$this->namespace]) as $v) { $this->namespaceVersion = $v; } if ('1'.static::NS_SEPARATOR === $this->namespaceVersion) { $this->namespaceVersion = substr_replace(base64_encode(pack('V', time())), static::NS_SEPARATOR, 5); $this->doSave([static::NS_SEPARATOR.$this->namespace => $this->namespaceVersion], 0); } } catch (\Exception $e) { } } if (\is_string($key) && isset($this->ids[$key])) { return $this->namespace.$this->namespaceVersion.$this->ids[$key]; } CacheItem::validateKey($key); $this->ids[$key] = $key; if (null === $this->maxIdLength) { return $this->namespace.$this->namespaceVersion.$key; } if (\strlen($id = $this->namespace.$this->namespaceVersion.$key) > $this->maxIdLength) { // Use MD5 to favor speed over security, which is not an issue here $this->ids[$key] = $id = substr_replace(base64_encode(hash('md5', $key, true)), static::NS_SEPARATOR, -(\strlen($this->namespaceVersion) + 2)); $id = $this->namespace.$this->namespaceVersion.$id; } return $id; } /** * @internal */ public static function handleUnserializeCallback($class) { throw new \DomainException('Class not found: '.$class); } }