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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Joas Schilling <coding@schilljs.com>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\Files\BackgroundJob;
use OC\BackgroundJob\TimedJob;
use OCP\DB\QueryBuilder\IQueryBuilder;
/**
* Delete all share entries that have no matching entries in the file cache table.
*/
class DeleteOrphanedItems extends TimedJob {
const CHUNK_SIZE = 200;
/** @var \OCP\IDBConnection */
protected $connection;
/** @var \OCP\ILogger */
protected $logger;
/**
* Default interval in minutes
*
* @var int $defaultIntervalMin
**/
protected $defaultIntervalMin = 60;
/**
* sets the correct interval for this timed job
*/
public function __construct() {
$this->interval = $this->defaultIntervalMin * 60;
$this->connection = \OC::$server->getDatabaseConnection();
$this->logger = \OC::$server->getLogger();
}
/**
* Makes the background job do its work
*
* @param array $argument unused argument
*/
public function run($argument) {
$this->cleanSystemTags();
$this->cleanUserTags();
$this->cleanComments();
$this->cleanCommentMarkers();
}
/**
* Deleting orphaned system tag mappings
*
* @param string $table
* @param string $idCol
* @param string $typeCol
* @return int Number of deleted entries
*/
protected function cleanUp($table, $idCol, $typeCol) {
$deletedEntries = 0;
$query = $this->connection->getQueryBuilder();
$query->select('t1.' . $idCol)
->from($table, 't1')
->where($query->expr()->eq($typeCol, $query->expr()->literal('files')))
->andWhere($query->expr()->isNull('t2.fileid'))
->leftJoin('t1', 'filecache', 't2', $query->expr()->eq($query->expr()->castColumn('t1.' . $idCol, IQueryBuilder::PARAM_INT), 't2.fileid'))
->groupBy('t1.' . $idCol)
->setMaxResults(self::CHUNK_SIZE);
$deleteQuery = $this->connection->getQueryBuilder();
$deleteQuery->delete($table)
->where($deleteQuery->expr()->eq($idCol, $deleteQuery->createParameter('objectid')));
$deletedInLastChunk = self::CHUNK_SIZE;
while ($deletedInLastChunk === self::CHUNK_SIZE) {
$result = $query->execute();
$deletedInLastChunk = 0;
while ($row = $result->fetch()) {
$deletedInLastChunk++;
$deletedEntries += $deleteQuery->setParameter('objectid', (int) $row[$idCol])
->execute();
}
$result->closeCursor();
}
return $deletedEntries;
}
/**
* Deleting orphaned system tag mappings
*
* @return int Number of deleted entries
*/
protected function cleanSystemTags() {
$deletedEntries = $this->cleanUp('systemtag_object_mapping', 'objectid', 'objecttype');
$this->logger->debug("$deletedEntries orphaned system tag relations deleted", ['app' => 'DeleteOrphanedItems']);
return $deletedEntries;
}
/**
* Deleting orphaned user tag mappings
*
* @return int Number of deleted entries
*/
protected function cleanUserTags() {
$deletedEntries = $this->cleanUp('vcategory_to_object', 'objid', 'type');
$this->logger->debug("$deletedEntries orphaned user tag relations deleted", ['app' => 'DeleteOrphanedItems']);
return $deletedEntries;
}
/**
* Deleting orphaned comments
*
* @return int Number of deleted entries
*/
protected function cleanComments() {
$deletedEntries = $this->cleanUp('comments', 'object_id', 'object_type');
$this->logger->debug("$deletedEntries orphaned comments deleted", ['app' => 'DeleteOrphanedItems']);
return $deletedEntries;
}
/**
* Deleting orphaned comment read markers
*
* @return int Number of deleted entries
*/
protected function cleanCommentMarkers() {
$deletedEntries = $this->cleanUp('comments_read_markers', 'object_id', 'object_type');
$this->logger->debug("$deletedEntries orphaned comment read marks deleted", ['app' => 'DeleteOrphanedItems']);
return $deletedEntries;
}
}