332 lines
10 KiB
PHP
332 lines
10 KiB
PHP
<?php
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/**
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* Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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namespace OC\Files\Cache;
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use OC\Files\Filesystem;
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use OC\Hooks\BasicEmitter;
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use OCP\Config;
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/**
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* Class Scanner
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*
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* Hooks available in scope \OC\Files\Cache\Scanner:
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* - scanFile(string $path, string $storageId)
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* - scanFolder(string $path, string $storageId)
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* - postScanFile(string $path, string $storageId)
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* - postScanFolder(string $path, string $storageId)
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*
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* @package OC\Files\Cache
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*/
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class Scanner extends BasicEmitter {
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/**
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* @var \OC\Files\Storage\Storage $storage
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*/
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private $storage;
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/**
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* @var string $storageId
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*/
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private $storageId;
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/**
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* @var \OC\Files\Cache\Cache $cache
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*/
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private $cache;
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/**
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* @var \OC\Files\Cache\Permissions $permissionsCache
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*/
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private $permissionsCache;
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/**
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* @var boolean $cacheActive If true, perform cache operations, if false, do not affect cache
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*/
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protected $cacheActive;
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const SCAN_RECURSIVE = true;
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const SCAN_SHALLOW = false;
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const REUSE_ETAG = 1;
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const REUSE_SIZE = 2;
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public function __construct(\OC\Files\Storage\Storage $storage) {
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$this->storage = $storage;
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$this->storageId = $this->storage->getId();
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$this->cache = $storage->getCache();
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$this->permissionsCache = $storage->getPermissionsCache();
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$this->cacheActive = !Config::getSystemValue('filesystem_cache_readonly', false);
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}
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/**
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* get all the metadata of a file or folder
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* *
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*
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* @param string $path
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* @return array an array of metadata of the file
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*/
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public function getData($path) {
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if (!$this->storage->isReadable($path)) {
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//cant read, nothing we can do
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\OCP\Util::writeLog('OC\Files\Cache\Scanner', "!!! Path '$path' is not readable !!!", \OCP\Util::DEBUG);
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return null;
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}
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$data = array();
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$data['mimetype'] = $this->storage->getMimeType($path);
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$data['mtime'] = $this->storage->filemtime($path);
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if ($data['mimetype'] == 'httpd/unix-directory') {
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$data['size'] = -1; //unknown
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} else {
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$data['size'] = $this->storage->filesize($path);
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}
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$data['etag'] = $this->storage->getETag($path);
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$data['storage_mtime'] = $data['mtime'];
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return $data;
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}
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/**
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* scan a single file and store it in the cache
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*
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* @param string $file
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* @param int $reuseExisting
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* @param bool $parentExistsInCache
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* @return array an array of metadata of the scanned file
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*/
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public function scanFile($file, $reuseExisting = 0, $parentExistsInCache = false) {
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if (!self::isPartialFile($file)
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and !Filesystem::isFileBlacklisted($file)
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) {
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$this->emit('\OC\Files\Cache\Scanner', 'scanFile', array($file, $this->storageId));
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\OC_Hook::emit('\OC\Files\Cache\Scanner', 'scan_file', array('path' => $file, 'storage' => $this->storageId));
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$data = $this->getData($file);
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if ($data) {
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if ($file and !$parentExistsInCache) {
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$parent = dirname($file);
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if ($parent === '.' or $parent === '/') {
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$parent = '';
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}
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if (!$this->cache->inCache($parent)) {
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$this->scanFile($parent);
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}
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}
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$newData = $data;
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$cacheData = $this->cache->get($file);
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if ($cacheData) {
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if (isset($cacheData['fileid'])) {
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$this->permissionsCache->remove($cacheData['fileid']);
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}
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if ($reuseExisting) {
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// prevent empty etag
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if (empty($cacheData['etag'])) {
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$etag = $data['etag'];
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$propagateETagChange = true;
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} else {
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$etag = $cacheData['etag'];
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$propagateETagChange = false;
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}
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// only reuse data if the file hasn't explicitly changed
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if (isset($data['storage_mtime']) && isset($cacheData['storage_mtime']) && $data['storage_mtime'] === $cacheData['storage_mtime']) {
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if (($reuseExisting & self::REUSE_SIZE) && ($data['size'] === -1)) {
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$data['size'] = $cacheData['size'];
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}
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if ($reuseExisting & self::REUSE_ETAG) {
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$data['etag'] = $etag;
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if ($propagateETagChange) {
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$parent = $file;
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while ($parent !== '') {
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$parent = dirname($parent);
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if ($parent === '.') {
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$parent = '';
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}
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$parentCacheData = $this->cache->get($parent);
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\OC_Hook::emit('Scanner', 'updateCache', array('file' => $file, 'data' => $data));
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if($this->cacheActive) {
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$this->cache->update($parentCacheData['fileid'], array(
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'etag' => $this->storage->getETag($parent),
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));
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}
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}
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}
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}
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}
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// Only update metadata that has changed
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$newData = array_diff_assoc($data, $cacheData);
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if (isset($newData['etag'])) {
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$cacheDataString = print_r($cacheData, true);
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$dataString = print_r($data, true);
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\OCP\Util::writeLog('OC\Files\Cache\Scanner',
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"!!! No reuse of etag for '$file' !!! \ncache: $cacheDataString \ndata: $dataString",
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\OCP\Util::DEBUG);
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}
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}
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}
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if (!empty($newData)) {
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\OC_Hook::emit('Scanner', 'addToCache', array('file' => $file, 'data' => $newData));
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if(!Config::getSystemValue('filesystem_cache_readonly', false)) {
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$data['fileid'] = $this->cache->put($file, $newData);
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}
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$this->emit('\OC\Files\Cache\Scanner', 'postScanFile', array($file, $this->storageId));
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\OC_Hook::emit('\OC\Files\Cache\Scanner', 'post_scan_file', array('path' => $file, 'storage' => $this->storageId));
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}
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} else {
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\OC_Hook::emit('Scanner', 'removeFromCache', array('file' => $file));
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if($this->cacheActive) {
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$this->cache->remove($file);
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}
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}
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return $data;
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}
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return null;
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}
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/**
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* scan a folder and all it's children
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*
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* @param string $path
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* @param bool $recursive
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* @param int $reuse
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* @return array an array of the meta data of the scanned file or folder
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*/
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public function scan($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1) {
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if ($reuse === -1) {
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$reuse = ($recursive === self::SCAN_SHALLOW) ? self::REUSE_ETAG | self::REUSE_SIZE : 0;
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}
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$data = $this->scanFile($path, $reuse);
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$size = $this->scanChildren($path, $recursive, $reuse);
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$data['size'] = $size;
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return $data;
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}
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/**
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* scan all the files and folders in a folder
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*
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* @param string $path
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* @param bool $recursive
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* @param int $reuse
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* @return int the size of the scanned folder or -1 if the size is unknown at this stage
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*/
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public function scanChildren($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1) {
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if ($reuse === -1) {
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$reuse = ($recursive === self::SCAN_SHALLOW) ? self::REUSE_ETAG | self::REUSE_SIZE : 0;
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}
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$this->emit('\OC\Files\Cache\Scanner', 'scanFolder', array($path, $this->storageId));
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$size = 0;
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$childQueue = array();
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$existingChildren = array();
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if ($this->cache->inCache($path)) {
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$children = $this->cache->getFolderContents($path);
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foreach ($children as $child) {
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$existingChildren[] = $child['name'];
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}
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}
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$newChildren = array();
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if ($this->storage->is_dir($path) && ($dh = $this->storage->opendir($path))) {
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$exceptionOccurred = false;
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\OC_DB::beginTransaction();
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if (is_resource($dh)) {
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while (($file = readdir($dh)) !== false) {
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$child = ($path) ? $path . '/' . $file : $file;
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if (!Filesystem::isIgnoredDir($file)) {
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$newChildren[] = $file;
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try {
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$data = $this->scanFile($child, $reuse, true);
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if ($data) {
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if ($data['size'] === -1) {
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if ($recursive === self::SCAN_RECURSIVE) {
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$childQueue[] = $child;
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} else {
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$size = -1;
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}
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} else if ($size !== -1) {
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$size += $data['size'];
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}
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}
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}
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catch (\Doctrine\DBAL\DBALException $ex){
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// might happen if inserting duplicate while a scanning
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// process is running in parallel
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// log and ignore
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\OC_Log::write('core', 'Exception while scanning file "' . $child . '": ' . $ex->getMessage(), \OC_Log::DEBUG);
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$exceptionOccurred = true;
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}
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}
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}
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}
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$removedChildren = \array_diff($existingChildren, $newChildren);
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foreach ($removedChildren as $childName) {
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$child = ($path) ? $path . '/' . $childName : $childName;
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\OC_Hook::emit('Scanner', 'removeFromCache', array('file' => $child));
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if($this->cacheActive) {
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$this->cache->remove($child);
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}
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}
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\OC_DB::commit();
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if ($exceptionOccurred){
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// It might happen that the parallel scan process has already
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// inserted mimetypes but those weren't available yet inside the transaction
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// To make sure to have the updated mime types in such cases,
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// we reload them here
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$this->cache->loadMimetypes();
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}
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foreach ($childQueue as $child) {
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$childSize = $this->scanChildren($child, self::SCAN_RECURSIVE, $reuse);
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if ($childSize === -1) {
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$size = -1;
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} else {
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$size += $childSize;
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}
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}
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$newData = array('size' => $size);
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\OC_Hook::emit('Scanner', 'addToCache', array('file' => $child, 'data' => $newData));
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if($this->cacheActive) {
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$this->cache->put($path, $newData);
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}
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}
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$this->emit('\OC\Files\Cache\Scanner', 'postScanFolder', array($path, $this->storageId));
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return $size;
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}
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/**
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* check if the file should be ignored when scanning
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* NOTE: files with a '.part' extension are ignored as well!
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* prevents unfinished put requests to be scanned
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* @param string $file
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* @return boolean
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*/
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public static function isPartialFile($file) {
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if (pathinfo($file, PATHINFO_EXTENSION) === 'part') {
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return true;
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}
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return false;
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}
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/**
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* walk over any folders that are not fully scanned yet and scan them
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*/
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public function backgroundScan() {
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$lastPath = null;
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while (($path = $this->cache->getIncomplete()) !== false && $path !== $lastPath) {
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$this->scan($path, self::SCAN_RECURSIVE, self::REUSE_ETAG);
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\OC_Hook::emit('Scanner', 'correctFolderSize', array('path' => $path));
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if($this->cacheActive) {
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$this->cache->correctFolderSize($path);
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}
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$lastPath = $path;
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}
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}
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/**
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* Set whether the cache is affected by scan operations
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* @param boolean $active The active state of the cache
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*/
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public function setCacheActive($active) {
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$this->cacheActive = $active;
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}
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}
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