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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Joas Schilling <coding@schilljs.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @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 OC\Repair;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IDBConnection;
use OCP\IUserManager;
use OCP\Migration\IOutput;
use OCP\Migration\IRepairStep;
/**
* Class RepairConfig
*
* @package OC\Repair
*/
class CleanTags implements IRepairStep {
/** @var IDBConnection */
protected $connection;
/** @var IUserManager */
protected $userManager;
protected $deletedTags = 0;
/**
* @param IDBConnection $connection
* @param IUserManager $userManager
*/
public function __construct(IDBConnection $connection, IUserManager $userManager) {
$this->connection = $connection;
$this->userManager = $userManager;
}
/**
* @return string
*/
public function getName() {
return 'Clean tags and favorites';
}
/**
* Updates the configuration after running an update
*/
public function run(IOutput $output) {
$this->deleteOrphanTags($output);
$this->deleteOrphanFileEntries($output);
$this->deleteOrphanTagEntries($output);
$this->deleteOrphanCategoryEntries($output);
}
/**
* Delete tags for deleted users
*/
protected function deleteOrphanTags(IOutput $output) {
$offset = 0;
while ($this->checkTags($offset)) {
$offset += 50;
}
$output->info(sprintf('%d tags of deleted users have been removed.', $this->deletedTags));
}
protected function checkTags($offset) {
$query = $this->connection->getQueryBuilder();
$query->select('uid')
->from('vcategory')
->groupBy('uid')
->orderBy('uid')
->setMaxResults(50)
->setFirstResult($offset);
$result = $query->execute();
$users = [];
$hadResults = false;
while ($row = $result->fetch()) {
$hadResults = true;
if (!$this->userManager->userExists($row['uid'])) {
$users[] = $row['uid'];
}
}
$result->closeCursor();
if (!$hadResults) {
// No more tags, stop looping
return false;
}
if (!empty($users)) {
$query = $this->connection->getQueryBuilder();
$query->delete('vcategory')
->where($query->expr()->in('uid', $query->createNamedParameter($users, IQueryBuilder::PARAM_STR_ARRAY)));
$this->deletedTags += $query->execute();
}
return true;
}
/**
* Delete tag entries for deleted files
*/
protected function deleteOrphanFileEntries(IOutput $output) {
$this->deleteOrphanEntries(
$output,
'%d tags for delete files have been removed.',
'vcategory_to_object', 'objid',
'filecache', 'fileid', 'path_hash'
);
}
/**
* Delete tag entries for deleted tags
*/
protected function deleteOrphanTagEntries(IOutput $output) {
$this->deleteOrphanEntries(
$output,
'%d tag entries for deleted tags have been removed.',
'vcategory_to_object', 'categoryid',
'vcategory', 'id', 'uid'
);
}
/**
* Delete tags that have no entries
*/
protected function deleteOrphanCategoryEntries(IOutput $output) {
$this->deleteOrphanEntries(
$output,
'%d tags with no entries have been removed.',
'vcategory', 'id',
'vcategory_to_object', 'categoryid', 'type'
);
}
/**
* Deletes all entries from $deleteTable that do not have a matching entry in $sourceTable
*
* A query joins $deleteTable.$deleteId = $sourceTable.$sourceId and checks
* whether $sourceNullColumn is null. If it is null, the entry in $deleteTable
* is being deleted.
*
* @param string $repairInfo
* @param string $deleteTable
* @param string $deleteId
* @param string $sourceTable
* @param string $sourceId
* @param string $sourceNullColumn If this column is null in the source table,
* the entry is deleted in the $deleteTable
* @suppress SqlInjectionChecker
*/
protected function deleteOrphanEntries(IOutput $output, $repairInfo, $deleteTable, $deleteId, $sourceTable, $sourceId, $sourceNullColumn) {
$qb = $this->connection->getQueryBuilder();
$qb->select('d.' . $deleteId)
->from($deleteTable, 'd')
->leftJoin('d', $sourceTable, 's', $qb->expr()->eq('d.' . $deleteId, 's.' . $sourceId))
->where(
$qb->expr()->eq('d.type', $qb->expr()->literal('files'))
)
->andWhere(
$qb->expr()->isNull('s.' . $sourceNullColumn)
);
$result = $qb->execute();
$orphanItems = array();
while ($row = $result->fetch()) {
$orphanItems[] = (int) $row[$deleteId];
}
if (!empty($orphanItems)) {
$orphanItemsBatch = array_chunk($orphanItems, 200);
foreach ($orphanItemsBatch as $items) {
$qb->delete($deleteTable)
->where(
$qb->expr()->eq('type', $qb->expr()->literal('files'))
)
->andWhere($qb->expr()->in($deleteId, $qb->createParameter('ids')));
$qb->setParameter('ids', $items, IQueryBuilder::PARAM_INT_ARRAY);
$qb->execute();
}
}
if ($repairInfo) {
$output->info(sprintf($repairInfo, count($orphanItems)));
}
}
}
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