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*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Cache;
use Psr\Log\LoggerInterface;
use Symfony\Contracts\Cache\CacheInterface;
use Symfony\Contracts\Cache\ItemInterface;
/**
* LockRegistry is used internally by existing adapters to protect against cache stampede.
*
* It does so by wrapping the computation of items in a pool of locks.
* Foreach each apps, there can be at most 20 concurrent processes that
* compute items at the same time and only one per cache-key.
*
* @author Nicolas Grekas
*/ final class LockRegistry { private static $openedFiles = []; private static $lockedFiles; private static $signalingException; private static $signalingCallback; /** * The number of items in this list controls the max number of concurrent processes. */ private static $files = [ __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'AbstractAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'AbstractTagAwareAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'AdapterInterface.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'ApcuAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'ArrayAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'ChainAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'CouchbaseBucketAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'CouchbaseCollectionAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'DoctrineAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'DoctrineDbalAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'FilesystemAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'FilesystemTagAwareAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'MemcachedAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'NullAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'ParameterNormalizer.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'PdoAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'PhpArrayAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'PhpFilesAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'ProxyAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'Psr16Adapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'RedisAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'RedisTagAwareAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'TagAwareAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'TagAwareAdapterInterface.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'TraceableAdapter.php', __DIR__.\DIRECTORY_SEPARATOR.'Adapter'.\DIRECTORY_SEPARATOR.'TraceableTagAwareAdapter.php', ]; /** * Defines a set of existing files that will be used as keys to acquire locks. * * @return array The previously defined set of files */ public static function setFiles(array $files): array { $previousFiles = self::$files; self::$files = $files; foreach (self::$openedFiles as $file) { if ($file) { flock($file, \LOCK_UN); fclose($file); } } self::$openedFiles = self::$lockedFiles = []; return $previousFiles; } public static function compute(callable $callback, ItemInterface $item, bool &$save, CacheInterface $pool, \Closure $setMetadata = null, LoggerInterface $logger = null) { if ('\\' === \DIRECTORY_SEPARATOR && null === self::$lockedFiles) { // disable locking on Windows by default self::$files = self::$lockedFiles = []; } $key = self::$files ? abs(crc32($item->getKey())) % \count(self::$files) : -1; if ($key < 0 || self::$lockedFiles || !$lock = self::open($key)) { return $callback($item, $save); } self::$signalingException ?? self::$signalingException = unserialize("O:9:\"Exception\":1:{s:16:\"\0Exception\0trace\";a:0:{}}"); self::$signalingCallback ?? self::$signalingCallback = function () { throw self::$signalingException; }; while (true) { try { $locked = false; // race to get the lock in non-blocking mode $locked = flock($lock, \LOCK_EX | \LOCK_NB, $wouldBlock); if ($locked || !$wouldBlock) { $logger && $logger->info(sprintf('Lock %s, now computing item "{key}"', $locked ? 'acquired' : 'not supported'), ['key' => $item->getKey()]); self::$lockedFiles[$key] = true; $value = $callback($item, $save); if ($save) { if ($setMetadata) { $setMetadata($item); } $pool->save($item->set($value)); $save = false; } return $value; } // if we failed the race, retry locking in blocking mode to wait for the winner $logger && $logger->info('Item "{key}" is locked, waiting for it to be released', ['key' => $item->getKey()]); flock($lock, \LOCK_SH); } finally { flock($lock, \LOCK_UN); unset(self::$lockedFiles[$key]); } try { $value = $pool->get($item->getKey(), self::$signalingCallback, 0); $logger && $logger->info('Item "{key}" retrieved after lock was released', ['key' => $item->getKey()]); $save = false; return $value; } catch (\Exception $e) { if (self::$signalingException !== $e) { throw $e; } $logger && $logger->info('Item "{key}" not found while lock was released, now retrying', ['key' => $item->getKey()]); } } return null; } private static function open(int $key) { if (null !== $h = self::$openedFiles[$key] ?? null) { return $h; } set_error_handler(function () {}); try { $h = fopen(self::$files[$key], 'r+'); } finally { restore_error_handler(); } return self::$openedFiles[$key] = $h ?: @fopen(self::$files[$key], 'r'); } }