96 lines
2.5 KiB
PHP
96 lines
2.5 KiB
PHP
<?php
|
|
/**
|
|
* Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
|
|
* This file is licensed under the Affero General Public License version 3 or
|
|
* later.
|
|
* See the COPYING-README file.
|
|
*/
|
|
|
|
namespace OC\Files\Cache;
|
|
|
|
/**
|
|
* check the storage backends for updates and change the cache accordingly
|
|
*/
|
|
class Watcher {
|
|
const CHECK_NEVER = 0; // never check the underlying filesystem for updates
|
|
const CHECK_ONCE = 1; // check the underlying filesystem for updates once every request for each file
|
|
const CHECK_ALWAYS = 2; // always check the underlying filesystem for updates
|
|
|
|
protected $watchPolicy = self::CHECK_ONCE;
|
|
|
|
protected $checkedPaths = array();
|
|
|
|
/**
|
|
* @var \OC\Files\Storage\Storage $storage
|
|
*/
|
|
protected $storage;
|
|
|
|
/**
|
|
* @var Cache $cache
|
|
*/
|
|
protected $cache;
|
|
|
|
/**
|
|
* @var Scanner $scanner ;
|
|
*/
|
|
protected $scanner;
|
|
|
|
/**
|
|
* @param \OC\Files\Storage\Storage $storage
|
|
*/
|
|
public function __construct(\OC\Files\Storage\Storage $storage) {
|
|
$this->storage = $storage;
|
|
$this->cache = $storage->getCache();
|
|
$this->scanner = $storage->getScanner();
|
|
}
|
|
|
|
/**
|
|
* @param int $policy either \OC\Files\Cache\Watcher::CHECK_NEVER, \OC\Files\Cache\Watcher::CHECK_ONCE, \OC\Files\Cache\Watcher::CHECK_ALWAYS
|
|
*/
|
|
public function setPolicy($policy) {
|
|
$this->watchPolicy = $policy;
|
|
}
|
|
|
|
/**
|
|
* check $path for updates
|
|
*
|
|
* @param string $path
|
|
* @return boolean|array true if path was updated, otherwise the cached data is returned
|
|
*/
|
|
public function checkUpdate($path) {
|
|
if ($this->watchPolicy === self::CHECK_ALWAYS or ($this->watchPolicy === self::CHECK_ONCE and array_search($path, $this->checkedPaths) === false)) {
|
|
$cachedEntry = $this->cache->get($path);
|
|
$this->checkedPaths[] = $path;
|
|
if ($this->storage->hasUpdated($path, $cachedEntry['storage_mtime'])) {
|
|
if ($this->storage->is_dir($path)) {
|
|
$this->scanner->scan($path, Scanner::SCAN_SHALLOW);
|
|
} else {
|
|
$this->scanner->scanFile($path);
|
|
}
|
|
if ($cachedEntry['mimetype'] === 'httpd/unix-directory') {
|
|
$this->cleanFolder($path);
|
|
}
|
|
$this->cache->correctFolderSize($path);
|
|
return true;
|
|
}
|
|
return $cachedEntry;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* remove deleted files in $path from the cache
|
|
*
|
|
* @param string $path
|
|
*/
|
|
public function cleanFolder($path) {
|
|
$cachedContent = $this->cache->getFolderContents($path);
|
|
foreach ($cachedContent as $entry) {
|
|
if (!$this->storage->file_exists($entry['path'])) {
|
|
$this->cache->remove($entry['path']);
|
|
}
|
|
}
|
|
}
|
|
}
|