nextcloud/lib/filecache.php

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<?php
/**
* @author Robin Appelman
* @copyright 2011 Robin Appelman icewind1991@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* provide caching for filesystem info in the database
*
* not used by OC_Filesystem for reading filesystem info,
* instread apps should use OC_FileCache::get where possible
*
* It will try to keep the data up to date but changes from outside ownCloud can invalidate the cache
*/
class OC_FileCache{
private static $savedData=array();
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/**
* get the filesystem info from the cache
* @param string path
* @param string root (optional)
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* @return array
*
* returns an assiciative array with the following keys:
* - size
* - mtime
* - ctime
* - mimetype
* - encrypted
* - versioned
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*/
public static function get($path,$root=''){
if(self::isUpdated($path,$root)){
if(!$root){//filesystem hooks are only valid for the default root
OC_Hook::emit('OC_Filesystem','post_write',array('path'=>$path));
}else{
self::fileSystemWatcherWrite(array('path'=>$path),$root);
}
}
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
$path=$root.$path;
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$query=OC_DB::prepare('SELECT ctime,mtime,mimetype,size,encrypted,versioned,writable FROM *PREFIX*fscache WHERE path_hash=?');
$result=$query->execute(array(md5($path)))->fetchRow();
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if(is_array($result)){
return $result;
}else{
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OC_Log::write('files','get(): file not found in cache ('.$path.')',OC_Log::DEBUG);
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return false;
}
}
/**
* put filesystem info in the cache
* @param string $path
* @param array data
* @param string root (optional)
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*
* $data is an assiciative array in the same format as returned by get
*/
public static function put($path,$data,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
$path=$root.$path;
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if($path=='/'){
$parent=-1;
}else{
$parent=self::getFileId(dirname($path));
}
$id=self::getFileId($path);
if($id!=-1){
self::update($id,$data);
return;
}
if(isset(self::$savedData[$path])){
$data=array_merge($data,self::$savedData[$path]);
unset(self::$savedData[$path]);
}
if(!isset($data['size']) or !isset($data['mtime'])){//save incomplete data for the next time we write it
self::$savedData[$path]=$data;
return;
}
if(!isset($data['encrypted'])){
$data['encrypted']=false;
}
if(!isset($data['versioned'])){
$data['versioned']=false;
}
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$mimePart=dirname($data['mimetype']);
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$data['size']=(int)$data['size'];
$data['ctime']=(int)$data['mtime'];
$data['writable']=(int)$data['writable'];
$data['encrypted']=(int)$data['encrypted'];
$data['versioned']=(int)$data['versioned'];
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$user=OC_User::getUser();
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$query=OC_DB::prepare('INSERT INTO *PREFIX*fscache(parent, name, path, path_hash, size, mtime, ctime, mimetype, mimepart,`user`,writable,encrypted,versioned) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?)');
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$result=$query->execute(array($parent,basename($path),$path,md5($path),$data['size'],$data['mtime'],$data['ctime'],$data['mimetype'],$mimePart,$user,$data['writable'],$data['encrypted'],$data['versioned']));
if(OC_DB::isError($result)){
OC_Log::write('files','error while writing file('.$path.') to cache',OC_Log::ERROR);
}
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}
/**
* update filesystem info of a file
* @param int $id
* @param array $data
*/
private static function update($id,$data){
$arguments=array();
$queryParts=array();
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foreach(array('size','mtime','ctime','mimetype','encrypted','versioned','writable') as $attribute){
if(isset($data[$attribute])){
$arguments[]=$data[$attribute];
$queryParts[]=$attribute.'=?';
}
}
if(isset($data['mimetype'])){
$arguments[]=dirname($data['mimetype']);
$queryParts[]='mimepart=?';
}
$arguments[]=$id;
$sql = 'UPDATE *PREFIX*fscache SET '.implode(' , ',$queryParts).' WHERE id=?';
$query=OC_DB::prepare($sql);
$result=$query->execute($arguments);
if(OC_DB::isError($result)){
OC_Log::write('files','error while updating file('.$path.') in cache',OC_Log::ERROR);
}
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}
/**
* register a file move in the cache
* @param string oldPath
* @param string newPath
* @param string root (optional)
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*/
public static function move($oldPath,$newPath,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
$oldPath=$root.$oldPath;
$newPath=$root.$newPath;
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$newParent=self::getParentId($newPath);
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$query=OC_DB::prepare('UPDATE *PREFIX*fscache SET parent=? ,name=?, path=?, path_hash=? WHERE path_hash=?');
$query->execute(array($newParent,basename($newPath),$newPath,md5($newPath),md5($oldPath)));
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}
/**
* delete info from the cache
* @param string/int $file
* @param string root (optional)
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*/
public static function delete($file,$root=''){
if(!is_numeric($file)){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
$path=$root.$file;
self::delete(self::getFileId($path));
}elseif($file!=-1){
$query=OC_DB::prepare('SELECT id FROM *PREFIX*fscache WHERE parent=?');
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$result=$query->execute(array($file));
while($child=$result->fetchRow()){
self::delete(intval($child['id']));
}
$query=OC_DB::prepare('DELETE FROM *PREFIX*fscache WHERE id=?');
$query->execute(array($file));
}
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}
/**
* return array of filenames matching the querty
* @param string $query
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* @param boolean $returnData
* @param string root (optional)
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* @return array of filepaths
*/
public static function search($search,$returnData=false,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
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$rootLen=strlen($root);
if(!$returnData){
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$query=OC_DB::prepare('SELECT path FROM *PREFIX*fscache WHERE name LIKE ? AND `user`=?');
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}else{
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$query=OC_DB::prepare('SELECT * FROM *PREFIX*fscache WHERE name LIKE ? AND `user`=?');
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}
$result=$query->execute(array("%$search%",OC_User::getUser()));
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$names=array();
while($row=$result->fetchRow()){
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if(!$returnData){
$names[]=substr($row['path'],$rootLen);
}else{
$row['path']=substr($row['path'],$rootLen);
$names[]=$row;
}
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}
return $names;
}
/**
* get all files and folders in a folder
* @param string path
* @param string root (optional)
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* @return array
*
* returns an array of assiciative arrays with the following keys:
* - name
* - size
* - mtime
* - ctime
* - mimetype
* - encrypted
* - versioned
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*/
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public static function getFolderContent($path,$root='',$mimetype_filter=''){
if(self::isUpdated($path,$root)){
self::updateFolder($path,$root);
}
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
$path=$root.$path;
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$parent=self::getFileId($path);
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$query=OC_DB::prepare('SELECT name,ctime,mtime,mimetype,size,encrypted,versioned,writable FROM *PREFIX*fscache WHERE parent=? AND (mimetype LIKE ? OR mimetype = ?)');
$result=$query->execute(array($parent, $mimetype_filter.'%', 'httpd/unix-directory'))->fetchAll();
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if(is_array($result)){
return $result;
}else{
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OC_Log::write('files','getFolderContent(): file not found in cache ('.$path.')',OC_Log::DEBUG);
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return false;
}
}
/**
* check if a file or folder is in the cache
* @param string $path
* @param string root (optional)
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* @return bool
*/
public static function inCache($path,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
$path=$root.$path;
return self::getFileId($path)!=-1;
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}
/**
* get the file id as used in the cache
* unlike the public getId, full paths are used here (/usename/files/foo instead of /foo)
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* @param string $path
* @return int
*/
private static function getFileId($path){
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$query=OC_DB::prepare('SELECT id FROM *PREFIX*fscache WHERE path_hash=?');
if(OC_DB::isError($query)){
OC_Log::write('files','error while getting file id of '.$path,OC_Log::ERROR);
return -1;
}
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$result=$query->execute(array(md5($path)));
if(OC_DB::isError($result)){
OC_Log::write('files','error while getting file id of '.$path,OC_Log::ERROR);
return -1;
}
$result=$result->fetchRow();
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if(is_array($result)){
return $result['id'];
}else{
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OC_Log::write('files','getFileId(): file not found in cache ('.$path.')',OC_Log::DEBUG);
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return -1;
}
}
/**
* get the file id as used in the cache
* @param string path
* @param string root (optional)
* @return int
*/
public static function getId($path,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
$path=$root.$path;
return self::getFileId($path);
}
/**
* get the file path from the id, relative to the home folder of the user
* @param int id
* @param string user (optional)
* @return string
*/
public static function getPath($id,$user=''){
if(!$user){
$user=OC_User::getUser();
}
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$query=OC_DB::prepare('SELECT path FROM *PREFIX*fscache WHERE id=? AND `user`=?');
$result=$query->execute(array($id,$user));
$row=$result->fetchRow();
$path=$row['path'];
$root='/'.$user.'/files';
if(substr($path,0,strlen($root))!=$root){
return false;
}
return substr($path,strlen($root));
}
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/**
* get the file id of the parent folder, taking into account '/' has no parent
* @param string $path
* @return int
*/
private static function getParentId($path){
if($path=='/'){
return -1;
}else{
return self::getFileId(dirname($path));
}
}
/**
* called when changes are made to files
* @param array $params
* @param string root (optional)
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*/
public static function fileSystemWatcherWrite($params,$root=''){
if(!$root){
$view=OC_Filesystem::getView();
}else{
$view=new OC_FilesystemView(($root=='/')?'':$root);
}
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$path=$params['path'];
$fullPath=$view->getRoot().$path;
$mimetype=$view->getMimeType($path);
$dir=$view->is_dir($path.'/');
//dont use self::get here, we don't want inifinte loops when a file has changed
$cachedSize=self::getCachedSize($path,$root);
$size=0;
if($dir){
if(self::inCache($path,$root)){
$parent=self::getFileId($fullPath);
$query=OC_DB::prepare('SELECT size FROM *PREFIX*fscache WHERE parent=?');
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$result=$query->execute(array($parent));
while($row=$result->fetchRow()){
$size+=$row['size'];
}
$mtime=$view->filemtime($path);
$ctime=$view->filectime($path);
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$writable=$view->is_writable($path);
self::put($path,array('size'=>$size,'mtime'=>$mtime,'ctime'=>$ctime,'mimetype'=>$mimetype,'writable'=>$writable));
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}else{
$count=0;
self::scan($path,null,$count,$root);
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}
}else{
$size=self::scanFile($path,$root);
}
self::increaseSize(dirname($fullPath),$size-$cachedSize);
}
public static function getCached($path,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}else{
if($root=='/'){
$root='';
}
}
$path=$root.$path;
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$query=OC_DB::prepare('SELECT ctime,mtime,mimetype,size,encrypted,versioned,writable FROM *PREFIX*fscache WHERE path_hash=?');
$result=$query->execute(array(md5($path)))->fetchRow();
if(is_array($result)){
if(isset(self::$savedData[$path])){
$result=array_merge($result,self::$savedData[$path]);
}
return $result;
}else{
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OC_Log::write('files','getChached(): file not found in cache ('.$path.')',OC_Log::DEBUG);
if(isset(self::$savedData[$path])){
return self::$savedData[$path];
}else{
return array();
}
}
}
private static function getCachedSize($path,$root){
if(!$root){
$root=OC_Filesystem::getRoot();
}else{
if($root=='/'){
$root='';
}
}
$path=$root.$path;
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$query=OC_DB::prepare('SELECT size FROM *PREFIX*fscache WHERE path_hash=?');
$result=$query->execute(array(md5($path)));
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if($row=$result->fetchRow()){
return $row['size'];
}else{//file not in cache
return 0;
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}
}
/**
* called when files are deleted
* @param array $params
* @param string root (optional)
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*/
public static function fileSystemWatcherDelete($params,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
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$path=$params['path'];
$fullPath=$root.$path;
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if(self::getFileId($fullPath)==-1){
return;
}
$size=self::getCachedSize($path,$root);
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self::increaseSize(dirname($fullPath),-$size);
self::delete($path);
}
/**
* called when files are deleted
* @param array $params
* @param string root (optional)
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*/
public static function fileSystemWatcherRename($params,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
}
if($root=='/'){
$root='';
}
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$oldPath=$params['oldpath'];
$newPath=$params['newpath'];
$fullOldPath=$root.$oldPath;
$fullNewPath=$root.$newPath;
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if(($id=self::getFileId($fullOldPath))!=-1){
$oldSize=self::getCachedSize($oldPath,$root);
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}else{
return;
}
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$size=OC_Filesystem::filesize($newPath);
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self::increaseSize(dirname($fullOldPath),-$oldSize);
self::increaseSize(dirname($fullNewPath),$oldSize);
self::move($oldPath,$newPath);
}
/**
* adjust the size of the parent folders
* @param string $path
* @param int $sizeDiff
*/
private static function increaseSize($path,$sizeDiff){
if($sizeDiff==0) return;
while(($id=self::getFileId($path))!=-1){//walk up the filetree increasing the size of all parent folders
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$query=OC_DB::prepare('UPDATE *PREFIX*fscache SET size=size+? WHERE id=?');
$query->execute(array($sizeDiff,$id));
$path=dirname($path);
}
}
/**
* recursively scan the filesystem and fill the cache
* @param string $path
* @param OC_EventSource $enventSource (optional)
* @param int count (optional)
* @param string root (optionak)
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*/
public static function scan($path,$eventSource=false,&$count=0,$root=''){
if($eventSource){
$eventSource->send('scanning',array('file'=>$path,'count'=>$count));
}
$lastSend=$count;
if(!$root){
$view=OC_Filesystem::getView();
}else{
$view=new OC_FilesystemView(($root=='/')?'':$root);
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}
self::scanFile($path,$root);
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$dh=$view->opendir($path.'/');
$totalSize=0;
if($dh){
while (($filename = readdir($dh)) !== false) {
if($filename != '.' and $filename != '..'){
$file=$path.'/'.$filename;
if($view->is_dir($file.'/')){
self::scan($file,$eventSource,$count,$root);
}else{
$totalSize+=self::scanFile($file,$root);
$count++;
if($count>$lastSend+25 and $eventSource){
$lastSend=$count;
$eventSource->send('scanning',array('file'=>$path,'count'=>$count));
}
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}
}
}
}
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self::cleanFolder($path,$root);
self::increaseSize($view->getRoot().$path,$totalSize);
}
/**
* scan a single file
* @param string path
* @param string root (optional)
* @return int size of the scanned file
*/
public static function scanFile($path,$root=''){
if(!$root){
$view=OC_Filesystem::getView();
}else{
$view=new OC_FilesystemView(($root=='/')?'':$root);
}
if(!$view->is_readable($path)) return; //cant read, nothing we can do
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clearstatcache();
$stat=$view->stat($path);
$mimetype=$view->getMimeType($path);
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$writable=$view->is_writable($path);
$stat['mimetype']=$mimetype;
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$stat['writable']=$writable;
if($path=='/'){
$path='';
}
self::put($path,$stat,$root);
return $stat['size'];
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}
/**
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* find files by mimetype
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* @param string $part1
* @param string $part2 (optional)
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* @param string root (optional)
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* @return array of file paths
*
* $part1 and $part2 together form the complete mimetype.
* e.g. searchByMime('text','plain')
*
* seccond mimetype part can be ommited
* e.g. searchByMime('audio')
*/
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public static function searchByMime($part1,$part2=null,$root=null){
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if(!$root){
$root=OC_Filesystem::getRoot();
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}elseif($root=='/'){
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$root='';
}
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$rootLen=strlen($root);
$root .= '%';
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$user=OC_User::getUser();
if(!$part2){
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$query=OC_DB::prepare('SELECT path FROM *PREFIX*fscache WHERE mimepart=? AND `user`=? AND path LIKE ?');
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$result=$query->execute(array($part1,$user, $root));
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}else{
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$query=OC_DB::prepare('SELECT path FROM *PREFIX*fscache WHERE mimetype=? AND `user`=? AND path LIKE ? ');
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$result=$query->execute(array($part1.'/'.$part2,$user, $root));
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}
$names=array();
while($row=$result->fetchRow()){
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$names[]=substr($row['path'],$rootLen);
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}
return $names;
}
/**
* check if a file or folder is updated outside owncloud
* @param string path
* @param string root (optional)
* @return bool
*/
public static function isUpdated($path,$root=''){
if(!$root){
$root=OC_Filesystem::getRoot();
$view=OC_Filesystem::getView();
}else{
if($root=='/'){
$root='';
}
$view=new OC_FilesystemView($root);
}
if(!$view->file_exists($path)){
return false;
}
$mtime=$view->filemtime($path);
$isDir=$view->is_dir($path);
$fullPath=$root.$path;
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$query=OC_DB::prepare('SELECT mtime FROM *PREFIX*fscache WHERE path_hash=?');
$result=$query->execute(array(md5($fullPath)));
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if($row=$result->fetchRow()){
$cachedMTime=$row['mtime'];
return ($mtime>$cachedMTime);
}else{//file not in cache, so it has to be updated
if($path=='/' or $path==''){//dont auto update the root folder, it will be scanned
return false;
}
return true;
}
}
/**
* update the cache according to changes in the folder
* @param string path
* @param string root (optional)
*/
private static function updateFolder($path,$root=''){
if(!$root){
$view=OC_Filesystem::getView();
}else{
$view=new OC_FilesystemView(($root=='/')?'':$root);
}
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$dh=$view->opendir($path.'/');
if($dh){//check for changed/new files
while (($filename = readdir($dh)) !== false) {
if($filename != '.' and $filename != '..'){
$file=$path.'/'.$filename;
if(self::isUpdated($file,$root)){
if(!$root){//filesystem hooks are only valid for the default root
OC_Hook::emit('OC_Filesystem','post_write',array('path'=>$file));
}else{
self::fileSystemWatcherWrite(array('path'=>$file),$root);
}
}
}
}
}
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self::cleanFolder($path,$root);
//update the folder last, so we can calculate the size correctly
if(!$root){//filesystem hooks are only valid for the default root
OC_Hook::emit('OC_Filesystem','post_write',array('path'=>$path));
}else{
self::fileSystemWatcherWrite(array('path'=>$path),$root);
}
}
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/**
* delete non existing files from the cache
*/
private static function cleanFolder($path,$root=''){
if(!$root){
$view=OC_Filesystem::getView();
}else{
$view=new OC_FilesystemView(($root=='/')?'':$root);
}
//check for removed files, not using getFolderContent to prevent loops
$parent=self::getFileId($view->getRoot().$path);
$query=OC_DB::prepare('SELECT name FROM *PREFIX*fscache WHERE parent=?');
$result=$query->execute(array($parent));
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while($row=$result->fetchRow()){
$file=$path.'/'.$row['name'];
if(!$view->file_exists($file)){
if(!$root){//filesystem hooks are only valid for the default root
OC_Hook::emit('OC_Filesystem','post_delete',array('path'=>$file));
}else{
self::fileSystemWatcherDelete(array('path'=>$file),$root);
}
}
}
}
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/**
* clean old pre-path_hash entries
*/
public static function clean(){
$query=OC_DB::prepare('DELETE FROM *PREFIX*fscache WHERE LENGTH(path_hash)<30');
$query->execute();
}
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}
//watch for changes and try to keep the cache up to date
OC_Hook::connect('OC_Filesystem','post_write','OC_FileCache','fileSystemWatcherWrite');
OC_Hook::connect('OC_Filesystem','post_delete','OC_FileCache','fileSystemWatcherDelete');
OC_Hook::connect('OC_Filesystem','post_rename','OC_FileCache','fileSystemWatcherRename');