setInterval(60 * 60); $this->setTimeSensitivity(self::TIME_INSENSITIVE); } public function run($argument): void { foreach ($this->getDeletedFiles() as $fileId) { $previewIds = []; foreach ($this->previewService->getAvailablePreviewsForFile($fileId) as $preview) { $this->previewService->deletePreview($preview); } } } /** * @return \Iterator */ private function getDeletedFiles(): \Iterator { if ($this->connection->getShardDefinition('filecache')) { foreach ($this->previewService->getAvailableFileIds() as $availableFileIdGroup) { $fileIds = $this->findMissingSources($availableFileIdGroup['storageId'], $availableFileIdGroup['fileIds']); foreach ($fileIds as $fileId) { yield $fileId; } } return; } /* * Deleting a file will not delete related previews right away. * * A delete request is usually an HTTP request. * The preview deleting is done by a background job to avoid timeouts. * * Previews for a file are stored within a folder in appdata_/preview using the fileid as folder name. * Preview folders in oc_filecache are identified by a.storage, a.path (cf. $like) and a.mimetype. * * To find preview folders to delete, we query oc_filecache for a preview folder in app data, matching the preview folder structure * and use the name to left join oc_filecache on a.name = b.fileid. A left join returns all rows from the left table (a), * even if there are no matches in the right table (b). * * If the related file is deleted, b.fileid will be null and the preview folder can be deleted. */ $qb = $this->connection->getQueryBuilder(); $qb->select('p.file_id') ->from('previews', 'p') ->leftJoin('p', 'filecache', 'f', $qb->expr()->eq( 'p.file_id', 'f.fileid' )) ->where($qb->expr()->isNull('f.fileid')); if (!$this->isCLI) { $qb->setMaxResults(10); } $cursor = $qb->executeQuery(); while ($row = $cursor->fetch()) { yield (int)$row['file_id']; } $cursor->closeCursor(); } /** * @param FileId[] $ids * @return FileId[] */ private function findMissingSources(int $storage, array $ids): array { $qb = $this->connection->getQueryBuilder(); $qb->select('fileid') ->from('filecache') ->where($qb->expr()->andX( $qb->expr()->in('fileid', $qb->createNamedParameter($ids, IQueryBuilder::PARAM_INT_ARRAY)), $qb->expr()->eq('storage', $qb->createNamedParameter($storage, IQueryBuilder::PARAM_INT)), )); $found = $qb->executeQuery()->fetchAll(\PDO::FETCH_COLUMN); return array_diff($ids, $found); } }