nextcloud/lib/private/files/cache/updater.php

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<?php
/**
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* @author Björn Schießle <schiessle@owncloud.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <icewind@owncloud.com>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @copyright Copyright (c) 2015, 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/>
*
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*/
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namespace OC\Files\Cache;
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/**
* Update the cache and propagate changes
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*
* Unlike most other classes an Updater is not related to a specific storage but handles updates for all storages in a users filesystem.
* This is needed because the propagation of mtime and etags need to cross storage boundaries
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*/
class Updater {
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/**
* @var bool
*/
protected $enabled = true;
/**
* @var \OC\Files\View
*/
protected $view;
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/**
* @var \OC\Files\Cache\ChangePropagator
*/
protected $propagator;
/**
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* @param \OC\Files\View $view the view the updater works on, usually the view of the logged in user
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*/
public function __construct($view) {
$this->view = $view;
$this->propagator = new ChangePropagator($view);
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}
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/**
* Disable updating the cache trough this updater
*/
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public function disable() {
$this->enabled = false;
}
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/**
* Re-enable the updating of the cache trough this updater
*/
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public function enable() {
$this->enabled = true;
}
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/**
* Get the propagator for etags and mtime for the view the updater works on
*
* @return ChangePropagator
*/
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public function getPropagator() {
return $this->propagator;
}
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/**
* 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;
}
$this->propagator->addChange($path);
$this->propagator->propagateChanges($time);
}
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/**
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* Update the cache for $path and update the size, etag and mtime of the parent folders
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*
* @param string $path
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* @param int $time
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*/
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public function update($path, $time = null) {
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if (!$this->enabled or Scanner::isPartialFile($path)) {
return;
}
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/**
* @var \OC\Files\Storage\Storage $storage
* @var string $internalPath
*/
list($storage, $internalPath) = $this->view->resolvePath($path);
if ($storage) {
$this->propagator->addChange($path);
$cache = $storage->getCache($internalPath);
$scanner = $storage->getScanner($internalPath);
$data = $scanner->scan($internalPath, Scanner::SCAN_SHALLOW, -1, false);
$this->correctParentStorageMtime($storage, $internalPath);
$cache->correctFolderSize($internalPath, $data);
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$this->propagator->propagateChanges($time);
}
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}
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/**
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* Remove $path from the cache and update the size, etag and mtime of the parent folders
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*
* @param string $path
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*/
public function remove($path) {
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if (!$this->enabled or Scanner::isPartialFile($path)) {
return;
}
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/**
* @var \OC\Files\Storage\Storage $storage
* @var string $internalPath
*/
list($storage, $internalPath) = $this->view->resolvePath($path);
if ($storage) {
$parent = dirname($internalPath);
if ($parent === '.') {
$parent = '';
}
$this->propagator->addChange($path);
$cache = $storage->getCache($internalPath);
$cache->remove($internalPath);
$cache->correctFolderSize($parent);
$this->correctParentStorageMtime($storage, $internalPath);
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$this->propagator->propagateChanges();
}
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}
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/**
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* Rename a file or folder in the cache and update the size, etag and mtime of the parent folders
*
* @param string $source
* @param string $target
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*/
public function rename($source, $target) {
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if (!$this->enabled or Scanner::isPartialFile($source) or Scanner::isPartialFile($target)) {
return;
}
/**
* @var \OC\Files\Storage\Storage $sourceStorage
* @var \OC\Files\Storage\Storage $targetStorage
* @var string $sourceInternalPath
* @var string $targetInternalPath
*/
list($sourceStorage, $sourceInternalPath) = $this->view->resolvePath($source);
// if it's a moved mountpoint we dont need to do anything
if ($sourceInternalPath === '') {
return;
}
list($targetStorage, $targetInternalPath) = $this->view->resolvePath($target);
if ($sourceStorage && $targetStorage) {
$targetCache = $targetStorage->getCache($sourceInternalPath);
if ($sourceStorage->getCache($sourceInternalPath)->inCache($sourceInternalPath)) {
if ($targetCache->inCache($targetInternalPath)) {
$targetCache->remove($targetInternalPath);
}
if ($sourceStorage === $targetStorage) {
$targetCache->move($sourceInternalPath, $targetInternalPath);
} else {
$targetCache->moveFromCache($sourceStorage->getCache(), $sourceInternalPath, $targetInternalPath);
}
}
if (pathinfo($sourceInternalPath, PATHINFO_EXTENSION) !== pathinfo($targetInternalPath, PATHINFO_EXTENSION)) {
// handle mime type change
$mimeType = $targetStorage->getMimeType($targetInternalPath);
$fileId = $targetCache->getId($targetInternalPath);
$targetCache->update($fileId, array('mimetype' => $mimeType));
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}
$targetCache->correctFolderSize($sourceInternalPath);
$targetCache->correctFolderSize($targetInternalPath);
$this->correctParentStorageMtime($sourceStorage, $sourceInternalPath);
$this->correctParentStorageMtime($targetStorage, $targetInternalPath);
$this->updateStorageMTimeOnly($targetStorage, $targetInternalPath);
$this->propagator->addChange($source);
$this->propagator->addChange($target);
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$this->propagator->propagateChanges();
}
}
private function updateStorageMTimeOnly($storage, $internalPath) {
$cache = $storage->getCache();
$fileId = $cache->getId($internalPath);
if ($fileId !== -1) {
$cache->update(
$fileId, [
'mtime' => null, // this magic tells it to not overwrite mtime
'storage_mtime' => $storage->filemtime($internalPath)
]
);
}
}
/**
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* update the storage_mtime of the direct parent in the cache to the mtime from the storage
*
* @param \OC\Files\Storage\Storage $storage
* @param string $internalPath
*/
private function correctParentStorageMtime($storage, $internalPath) {
$cache = $storage->getCache();
$parentId = $cache->getParentId($internalPath);
$parent = dirname($internalPath);
if ($parentId != -1) {
$cache->update($parentId, array('storage_mtime' => $storage->filemtime($parent)));
}
}
public function __destruct() {
// propagate any leftover changes
$this->propagator->propagateChanges();
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}
}