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<?php
/**
* @author Robin Appelman <icewind@owncloud.com>
*
* @copyright Copyright (c) 2016, ownCloud, Inc.
* @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\Files\Cache;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\Files\Cache\IPropagator;
use OCP\IDBConnection;
/**
* Propagate etags and mtimes within the storage
*/
class Propagator implements IPropagator {
private $inBatch = false;
private $batch = [];
/**
* @var \OC\Files\Storage\Storage
*/
protected $storage;
/**
* @var IDBConnection
*/
private $connection;
/**
* @param \OC\Files\Storage\Storage $storage
* @param IDBConnection $connection
*/
public function __construct(\OC\Files\Storage\Storage $storage, IDBConnection $connection) {
$this->storage = $storage;
$this->connection = $connection;
}
/**
* @param string $internalPath
* @param int $time
* @param int $sizeDifference number of bytes the file has grown
*/
public function propagateChange($internalPath, $time, $sizeDifference = 0) {
$storageId = (int)$this->storage->getStorageCache()->getNumericId();
$parents = $this->getParents($internalPath);
if ($this->inBatch) {
foreach ($parents as $parent) {
$this->addToBatch($parent, $time, $sizeDifference);
}
return;
}
$parentHashes = array_map('md5', $parents);
$etag = uniqid(); // since we give all folders the same etag we don't ask the storage for the etag
$builder = $this->connection->getQueryBuilder();
$hashParams = array_map(function ($hash) use ($builder) {
return $builder->expr()->literal($hash);
}, $parentHashes);
$builder->update('filecache')
->set('mtime', $builder->createFunction('GREATEST(`mtime`, ' . $builder->createNamedParameter($time, IQueryBuilder::PARAM_INT) . ')'))
->set('etag', $builder->createNamedParameter($etag, IQueryBuilder::PARAM_STR))
->where($builder->expr()->eq('storage', $builder->createNamedParameter($storageId, IQueryBuilder::PARAM_INT)))
->andWhere($builder->expr()->in('path_hash', $hashParams));
$builder->execute();
if ($sizeDifference !== 0) {
// we need to do size separably so we can ignore entries with uncalculated size
$builder = $this->connection->getQueryBuilder();
$builder->update('filecache')
->set('size', $builder->createFunction('`size` + ' . $builder->createNamedParameter($sizeDifference)))
->where($builder->expr()->eq('storage', $builder->createNamedParameter($storageId, IQueryBuilder::PARAM_INT)))
->andWhere($builder->expr()->in('path_hash', $hashParams))
->andWhere($builder->expr()->gt('size', $builder->expr()->literal(-1, IQueryBuilder::PARAM_INT)));
}
$builder->execute();
}
protected function getParents($path) {
$parts = explode('/', $path);
$parent = '';
$parents = [];
foreach ($parts as $part) {
$parents[] = $parent;
$parent = trim($parent . '/' . $part, '/');
}
return $parents;
}
/**
* Mark the beginning of a propagation batch
*
* Note that not all cache setups support propagation in which case this will be a noop
*
* Batching for cache setups that do support it has to be explicit since the cache state is not fully consistent
* before the batch is committed.
*/
public function beginBatch() {
$this->inBatch = true;
}
private function addToBatch($internalPath, $time, $sizeDifference) {
if (!isset($this->batch[$internalPath])) {
$this->batch[$internalPath] = [
'hash' => md5($internalPath),
'time' => $time,
'size' => $sizeDifference
];
} else {
$this->batch[$internalPath]['size'] += $sizeDifference;
if ($time > $this->batch[$internalPath]['time']) {
$this->batch[$internalPath]['time'] = $time;
}
}
}
/**
* Commit the active propagation batch
*/
public function commitBatch() {
if (!$this->inBatch) {
throw new \BadMethodCallException('Not in batch');
}
$this->inBatch = false;
$this->connection->beginTransaction();
$query = $this->connection->getQueryBuilder();
$storageId = (int)$this->storage->getStorageCache()->getNumericId();
$query->update('filecache')
->set('mtime', $query->createFunction('GREATEST(`mtime`, ' . $query->createParameter('time') . ')'))
->set('etag', $query->expr()->literal(uniqid()))
->where($query->expr()->eq('storage', $query->expr()->literal($storageId, IQueryBuilder::PARAM_INT)))
->andWhere($query->expr()->eq('path_hash', $query->createParameter('hash')));
$sizeQuery = $this->connection->getQueryBuilder();
$sizeQuery->update('filecache')
->set('size', $sizeQuery->createFunction('`size` + ' . $sizeQuery->createParameter('size')))
->where($query->expr()->eq('storage', $query->expr()->literal($storageId, IQueryBuilder::PARAM_INT)))
->andWhere($query->expr()->eq('path_hash', $query->createParameter('hash')))
->andWhere($sizeQuery->expr()->gt('size', $sizeQuery->expr()->literal(-1, IQueryBuilder::PARAM_INT)));
foreach ($this->batch as $item) {
$query->setParameter('time', $item['time'], IQueryBuilder::PARAM_INT);
$query->setParameter('hash', $item['hash']);
$query->execute();
if ($item['size']) {
$sizeQuery->setParameter('size', $item['size'], IQueryBuilder::PARAM_INT);
$sizeQuery->setParameter('hash', $item['hash']);
$sizeQuery->execute();
}
}
$this->batch = [];
$this->connection->commit();
}
}
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