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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Björn Schießle <bjoern@schiessle.org>
* @author Daniel Jagszent <daniel@jagszent.de>
* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @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 OC\Files\Cache;
use OCP\Files\Cache\ICacheEntry;
use OCP\Files\Cache\IUpdater;
use OCP\Files\Storage\IStorage;
/**
* Update the cache and propagate changes
*
*/
class Updater implements IUpdater {
/**
* @var bool
*/
protected $enabled = true;
/**
* @var \OC\Files\Storage\Storage
*/
protected $storage;
/**
* @var \OC\Files\Cache\Propagator
*/
protected $propagator;
/**
* @var Scanner
*/
protected $scanner;
/**
* @var Cache
*/
protected $cache;
/**
* @param \OC\Files\Storage\Storage $storage
*/
public function __construct(\OC\Files\Storage\Storage $storage) {
$this->storage = $storage;
$this->propagator = $storage->getPropagator();
$this->scanner = $storage->getScanner();
$this->cache = $storage->getCache();
}
/**
* Disable updating the cache trough this updater
*/
public function disable() {
$this->enabled = false;
}
/**
* Re-enable the updating of the cache trough this updater
*/
public function enable() {
$this->enabled = true;
}
/**
* Get the propagator for etags and mtime for the view the updater works on
*
* @return Propagator
*/
public function getPropagator() {
return $this->propagator;
}
/**
* Propagate etag and mtime changes for the parent folders of $path up to the root of the filesystem
*
* @param string $path the path of the file to propagate the changes for
* @param int|null $time the timestamp to set as mtime for the parent folders, if left out the current time is used
*/
public function propagate($path, $time = null) {
if (Scanner::isPartialFile($path)) {
return;
}
$this->propagator->propagateChange($path, $time);
}
/**
* Update the cache for $path and update the size, etag and mtime of the parent folders
*
* @param string $path
* @param int $time
*/
public function update($path, $time = null) {
if (!$this->enabled or Scanner::isPartialFile($path)) {
return;
}
if (is_null($time)) {
$time = time();
}
$data = $this->scanner->scan($path, Scanner::SCAN_SHALLOW, -1, false);
if (
isset($data['oldSize']) && isset($data['size']) &&
!$data['encrypted'] // encryption is a pita and touches the cache itself
) {
$sizeDifference = $data['size'] - $data['oldSize'];
} else {
// scanner didn't provide size info, fallback to full size calculation
$sizeDifference = 0;
if ($this->cache instanceof Cache) {
$this->cache->correctFolderSize($path, $data);
}
}
$this->correctParentStorageMtime($path);
$this->propagator->propagateChange($path, $time, $sizeDifference);
}
/**
* Remove $path from the cache and update the size, etag and mtime of the parent folders
*
* @param string $path
*/
public function remove($path) {
if (!$this->enabled or Scanner::isPartialFile($path)) {
return;
}
$parent = dirname($path);
if ($parent === '.') {
$parent = '';
}
$entry = $this->cache->get($path);
$this->cache->remove($path);
$this->correctParentStorageMtime($path);
if ($entry instanceof ICacheEntry) {
$this->propagator->propagateChange($path, time(), -$entry->getSize());
} else {
$this->propagator->propagateChange($path, time());
if ($this->cache instanceof Cache) {
$this->cache->correctFolderSize($parent);
}
}
}
/**
* Rename a file or folder in the cache and update the size, etag and mtime of the parent folders
*
* @param IStorage $sourceStorage
* @param string $source
* @param string $target
*/
public function renameFromStorage(IStorage $sourceStorage, $source, $target) {
if (!$this->enabled or Scanner::isPartialFile($source) or Scanner::isPartialFile($target)) {
return;
}
$time = time();
$sourceCache = $sourceStorage->getCache();
$sourceUpdater = $sourceStorage->getUpdater();
$sourcePropagator = $sourceStorage->getPropagator();
if ($sourceCache->inCache($source)) {
if ($this->cache->inCache($target)) {
$this->cache->remove($target);
}
if ($sourceStorage === $this->storage) {
$this->cache->move($source, $target);
} else {
$this->cache->moveFromCache($sourceCache, $source, $target);
}
}
if (pathinfo($source, PATHINFO_EXTENSION) !== pathinfo($target, PATHINFO_EXTENSION)) {
// handle mime type change
$mimeType = $this->storage->getMimeType($target);
$fileId = $this->cache->getId($target);
$this->cache->update($fileId, ['mimetype' => $mimeType]);
}
if ($sourceCache instanceof Cache) {
$sourceCache->correctFolderSize($source);
}
if ($this->cache instanceof Cache) {
$this->cache->correctFolderSize($target);
}
if ($sourceUpdater instanceof Updater) {
$sourceUpdater->correctParentStorageMtime($source);
}
$this->correctParentStorageMtime($target);
$this->updateStorageMTimeOnly($target);
$sourcePropagator->propagateChange($source, $time);
$this->propagator->propagateChange($target, $time);
}
private function updateStorageMTimeOnly($internalPath) {
$fileId = $this->cache->getId($internalPath);
if ($fileId !== -1) {
$this->cache->update(
$fileId, [
'mtime' => null, // this magic tells it to not overwrite mtime
'storage_mtime' => $this->storage->filemtime($internalPath)
]
);
}
}
/**
* update the storage_mtime of the direct parent in the cache to the mtime from the storage
*
* @param string $internalPath
*/
private function correctParentStorageMtime($internalPath) {
$parentId = $this->cache->getParentId($internalPath);
$parent = dirname($internalPath);
if ($parentId != -1) {
$mtime = $this->storage->filemtime($parent);
if ($mtime !== false) {
$this->cache->update($parentId, array('storage_mtime' => $mtime));
}
}
}
}