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146 lines
3.9 KiB
146 lines
3.9 KiB
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Daniel Jagszent <daniel@jagszent.de>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Files\Cache;
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use OCP\Files\Cache\ICacheEntry;
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use OCP\Files\Cache\IWatcher;
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/**
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* check the storage backends for updates and change the cache accordingly
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*/
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class Watcher implements IWatcher {
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protected $watchPolicy = self::CHECK_ONCE;
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protected $checkedPaths = [];
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/**
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* @var \OC\Files\Storage\Storage $storage
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*/
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protected $storage;
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/**
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* @var Cache $cache
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*/
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protected $cache;
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/**
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* @var Scanner $scanner ;
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*/
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protected $scanner;
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/**
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* @param \OC\Files\Storage\Storage $storage
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*/
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public function __construct(\OC\Files\Storage\Storage $storage) {
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$this->storage = $storage;
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$this->cache = $storage->getCache();
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$this->scanner = $storage->getScanner();
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}
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/**
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* @param int $policy either \OC\Files\Cache\Watcher::CHECK_NEVER, \OC\Files\Cache\Watcher::CHECK_ONCE, \OC\Files\Cache\Watcher::CHECK_ALWAYS
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*/
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public function setPolicy($policy) {
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$this->watchPolicy = $policy;
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}
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/**
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* @return int either \OC\Files\Cache\Watcher::CHECK_NEVER, \OC\Files\Cache\Watcher::CHECK_ONCE, \OC\Files\Cache\Watcher::CHECK_ALWAYS
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*/
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public function getPolicy() {
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return $this->watchPolicy;
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}
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/**
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* check $path for updates and update if needed
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*
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* @param string $path
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* @param ICacheEntry|null $cachedEntry
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* @return boolean true if path was updated
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*/
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public function checkUpdate($path, $cachedEntry = null) {
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if (is_null($cachedEntry)) {
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$cachedEntry = $this->cache->get($path);
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}
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if ($cachedEntry === false || $this->needsUpdate($path, $cachedEntry)) {
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$this->update($path, $cachedEntry);
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return true;
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} else {
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return false;
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}
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}
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/**
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* Update the cache for changes to $path
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*
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* @param string $path
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* @param ICacheEntry $cachedData
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*/
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public function update($path, $cachedData) {
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if ($this->storage->is_dir($path)) {
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$this->scanner->scan($path, Scanner::SCAN_SHALLOW);
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} else {
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$this->scanner->scanFile($path);
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}
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if (is_array($cachedData) && $cachedData['mimetype'] === 'httpd/unix-directory') {
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$this->cleanFolder($path);
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}
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if ($this->cache instanceof Cache) {
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$this->cache->correctFolderSize($path);
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}
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}
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/**
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* Check if the cache for $path needs to be updated
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*
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* @param string $path
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* @param ICacheEntry $cachedData
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* @return bool
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*/
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public function needsUpdate($path, $cachedData) {
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if ($this->watchPolicy === self::CHECK_ALWAYS or ($this->watchPolicy === self::CHECK_ONCE and array_search($path, $this->checkedPaths) === false)) {
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$this->checkedPaths[] = $path;
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return $this->storage->hasUpdated($path, $cachedData['storage_mtime']);
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}
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return false;
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}
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/**
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* remove deleted files in $path from the cache
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*
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* @param string $path
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*/
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public function cleanFolder($path) {
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$cachedContent = $this->cache->getFolderContents($path);
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foreach ($cachedContent as $entry) {
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if (!$this->storage->file_exists($entry['path'])) {
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$this->cache->remove($entry['path']);
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}
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}
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}
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}
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