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<?php
declare(strict_types=1);
/*
* @copyright 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @author 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OCP\AppFramework\Db;
use OCP\DB\Exception;
use OCP\IDBConnection;
use Throwable;
/**
* Helper trait for transactional operations
*
* @since 24.0.0
*/
trait TTransactional {
/**
* Run an atomic database operation
*
* - Commit if no exceptions are thrown, return the callable result
* - Revert otherwise and rethrows the exception
*
* @template T
* @param callable $fn
* @psalm-param callable():T $fn
* @param IDBConnection $db
*
* @return mixed the result of the passed callable
* @psalm-return T
*
* @throws Exception for possible errors of commit or rollback or the custom operations within the closure
* @throws Throwable any other error caused by the closure
*
* @since 24.0.0
* @see https://docs.nextcloud.com/server/latest/developer_manual/basics/storage/database.html#transactions
*/
protected function atomic(callable $fn, IDBConnection $db) {
$db->beginTransaction();
try {
$result = $fn();
$db->commit();
return $result;
} catch (Throwable $e) {
$db->rollBack();
throw $e;
}
}
}
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