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1738 lines
60 KiB
PHP
1738 lines
60 KiB
PHP
<?php
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/**
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* Base class for all backends using particular storage medium.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup FileBackend
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* @author Aaron Schulz
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*/
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/**
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* @brief Base class for all backends using particular storage medium.
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*
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* This class defines the methods as abstract that subclasses must implement.
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* Outside callers should *not* use functions with "Internal" in the name.
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*
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* The FileBackend operations are implemented using basic functions
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* such as storeInternal(), copyInternal(), deleteInternal() and the like.
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* This class is also responsible for path resolution and sanitization.
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*
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* @ingroup FileBackend
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* @since 1.19
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*/
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abstract class FileBackendStore extends FileBackend {
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/** @var BagOStuff */
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protected $memCache;
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/** @var ProcessCacheLRU Map of paths to small (RAM/disk) cache items */
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protected $cheapCache;
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/** @var ProcessCacheLRU Map of paths to large (RAM/disk) cache items */
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protected $expensiveCache;
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/** @var Array Map of container names to sharding config */
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protected $shardViaHashLevels = array();
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/** @var callback Method to get the MIME type of files */
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protected $mimeCallback;
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protected $maxFileSize = 4294967296; // integer bytes (4GiB)
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const CACHE_TTL = 10; // integer; TTL in seconds for process cache entries
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const CACHE_CHEAP_SIZE = 300; // integer; max entries in "cheap cache"
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const CACHE_EXPENSIVE_SIZE = 5; // integer; max entries in "expensive cache"
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/**
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* @see FileBackend::__construct()
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* Additional $config params include:
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* - mimeCallback : Callback that takes (storage path, content, file system path) and
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* returns the MIME type of the file or 'unknown/unknown'. The file
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* system path parameter should be used if the content one is null.
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*
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* @param array $config
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*/
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public function __construct( array $config ) {
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parent::__construct( $config );
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$this->mimeCallback = isset( $config['mimeCallback'] )
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? $config['mimeCallback']
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: function( $storagePath, $content, $fsPath ) {
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// @TODO: handle the case of extension-less files using the contents
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return StreamFile::contentTypeFromPath( $storagePath ) ?: 'unknown/unknown';
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};
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$this->memCache = new EmptyBagOStuff(); // disabled by default
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$this->cheapCache = new ProcessCacheLRU( self::CACHE_CHEAP_SIZE );
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$this->expensiveCache = new ProcessCacheLRU( self::CACHE_EXPENSIVE_SIZE );
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}
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/**
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* Get the maximum allowable file size given backend
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* medium restrictions and basic performance constraints.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* @return integer Bytes
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*/
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final public function maxFileSizeInternal() {
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return $this->maxFileSize;
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}
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/**
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* Check if a file can be created or changed at a given storage path.
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* FS backends should check if the parent directory exists, files can be
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* written under it, and that any file already there is writable.
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* Backends using key/value stores should check if the container exists.
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*
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* @param string $storagePath
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* @return bool
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*/
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abstract public function isPathUsableInternal( $storagePath );
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/**
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* Create a file in the backend with the given contents.
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* This will overwrite any file that exists at the destination.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* $params include:
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* - content : the raw file contents
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* - dst : destination storage path
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* - headers : HTTP header name/value map
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* - async : Status will be returned immediately if supported.
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* If the status is OK, then its value field will be
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* set to a FileBackendStoreOpHandle object.
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* - dstExists : Whether a file exists at the destination (optimization).
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* Callers can use "false" if no existing file is being changed.
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*
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* @param array $params
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* @return Status
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*/
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final public function createInternal( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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if ( strlen( $params['content'] ) > $this->maxFileSizeInternal() ) {
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$status = Status::newFatal( 'backend-fail-maxsize',
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$params['dst'], $this->maxFileSizeInternal() );
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} else {
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$status = $this->doCreateInternal( $params );
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$this->clearCache( array( $params['dst'] ) );
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if ( !isset( $params['dstExists'] ) || $params['dstExists'] ) {
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$this->deleteFileCache( $params['dst'] ); // persistent cache
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}
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}
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return $status;
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}
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/**
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* @see FileBackendStore::createInternal()
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* @return Status
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*/
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abstract protected function doCreateInternal( array $params );
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/**
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* Store a file into the backend from a file on disk.
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* This will overwrite any file that exists at the destination.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* $params include:
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* - src : source path on disk
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* - dst : destination storage path
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* - headers : HTTP header name/value map
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* - async : Status will be returned immediately if supported.
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* If the status is OK, then its value field will be
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* set to a FileBackendStoreOpHandle object.
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* - dstExists : Whether a file exists at the destination (optimization).
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* Callers can use "false" if no existing file is being changed.
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*
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* @param array $params
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* @return Status
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*/
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final public function storeInternal( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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if ( filesize( $params['src'] ) > $this->maxFileSizeInternal() ) {
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$status = Status::newFatal( 'backend-fail-maxsize',
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$params['dst'], $this->maxFileSizeInternal() );
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} else {
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$status = $this->doStoreInternal( $params );
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$this->clearCache( array( $params['dst'] ) );
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if ( !isset( $params['dstExists'] ) || $params['dstExists'] ) {
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$this->deleteFileCache( $params['dst'] ); // persistent cache
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}
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}
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return $status;
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}
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/**
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* @see FileBackendStore::storeInternal()
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* @return Status
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*/
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abstract protected function doStoreInternal( array $params );
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/**
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* Copy a file from one storage path to another in the backend.
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* This will overwrite any file that exists at the destination.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* $params include:
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* - src : source storage path
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* - dst : destination storage path
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* - ignoreMissingSource : do nothing if the source file does not exist
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* - headers : HTTP header name/value map
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* - async : Status will be returned immediately if supported.
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* If the status is OK, then its value field will be
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* set to a FileBackendStoreOpHandle object.
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* - dstExists : Whether a file exists at the destination (optimization).
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* Callers can use "false" if no existing file is being changed.
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*
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* @param array $params
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* @return Status
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*/
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final public function copyInternal( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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$status = $this->doCopyInternal( $params );
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$this->clearCache( array( $params['dst'] ) );
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if ( !isset( $params['dstExists'] ) || $params['dstExists'] ) {
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$this->deleteFileCache( $params['dst'] ); // persistent cache
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}
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return $status;
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}
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/**
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* @see FileBackendStore::copyInternal()
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* @return Status
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*/
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abstract protected function doCopyInternal( array $params );
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/**
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* Delete a file at the storage path.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* $params include:
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* - src : source storage path
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* - ignoreMissingSource : do nothing if the source file does not exist
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* - async : Status will be returned immediately if supported.
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* If the status is OK, then its value field will be
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* set to a FileBackendStoreOpHandle object.
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*
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* @param array $params
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* @return Status
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*/
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final public function deleteInternal( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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$status = $this->doDeleteInternal( $params );
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$this->clearCache( array( $params['src'] ) );
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$this->deleteFileCache( $params['src'] ); // persistent cache
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return $status;
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}
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/**
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* @see FileBackendStore::deleteInternal()
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* @return Status
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*/
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abstract protected function doDeleteInternal( array $params );
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/**
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* Move a file from one storage path to another in the backend.
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* This will overwrite any file that exists at the destination.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* $params include:
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* - src : source storage path
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* - dst : destination storage path
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* - ignoreMissingSource : do nothing if the source file does not exist
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* - headers : HTTP header name/value map
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* - async : Status will be returned immediately if supported.
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* If the status is OK, then its value field will be
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* set to a FileBackendStoreOpHandle object.
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* - dstExists : Whether a file exists at the destination (optimization).
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* Callers can use "false" if no existing file is being changed.
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*
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* @param array $params
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* @return Status
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*/
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final public function moveInternal( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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$status = $this->doMoveInternal( $params );
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$this->clearCache( array( $params['src'], $params['dst'] ) );
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$this->deleteFileCache( $params['src'] ); // persistent cache
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if ( !isset( $params['dstExists'] ) || $params['dstExists'] ) {
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$this->deleteFileCache( $params['dst'] ); // persistent cache
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}
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return $status;
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}
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/**
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* @see FileBackendStore::moveInternal()
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* @return Status
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*/
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protected function doMoveInternal( array $params ) {
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unset( $params['async'] ); // two steps, won't work here :)
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$nsrc = FileBackend::normalizeStoragePath( $params['src'] );
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$ndst = FileBackend::normalizeStoragePath( $params['dst'] );
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// Copy source to dest
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$status = $this->copyInternal( $params );
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if ( $nsrc !== $ndst && $status->isOK() ) {
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// Delete source (only fails due to races or network problems)
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$status->merge( $this->deleteInternal( array( 'src' => $params['src'] ) ) );
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$status->setResult( true, $status->value ); // ignore delete() errors
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}
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return $status;
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}
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/**
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* Alter metadata for a file at the storage path.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* $params include:
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* - src : source storage path
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* - headers : HTTP header name/value map
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* - async : Status will be returned immediately if supported.
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* If the status is OK, then its value field will be
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* set to a FileBackendStoreOpHandle object.
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*
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* @param array $params
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* @return Status
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*/
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final public function describeInternal( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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if ( count( $params['headers'] ) ) {
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$status = $this->doDescribeInternal( $params );
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$this->clearCache( array( $params['src'] ) );
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$this->deleteFileCache( $params['src'] ); // persistent cache
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} else {
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$status = Status::newGood(); // nothing to do
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}
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return $status;
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}
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/**
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* @see FileBackendStore::describeInternal()
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* @return Status
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*/
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protected function doDescribeInternal( array $params ) {
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return Status::newGood();
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}
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/**
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* No-op file operation that does nothing.
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* Do not call this function from places outside FileBackend and FileOp.
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*
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* @param array $params
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* @return Status
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*/
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final public function nullInternal( array $params ) {
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return Status::newGood();
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}
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final public function concatenate( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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$status = Status::newGood();
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// Try to lock the source files for the scope of this function
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$scopeLockS = $this->getScopedFileLocks( $params['srcs'], LockManager::LOCK_UW, $status );
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if ( $status->isOK() ) {
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// Actually do the file concatenation...
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$start_time = microtime( true );
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$status->merge( $this->doConcatenate( $params ) );
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$sec = microtime( true ) - $start_time;
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if ( !$status->isOK() ) {
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wfDebugLog( 'FileOperation', get_class( $this ) . " failed to concatenate " .
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count( $params['srcs'] ) . " file(s) [$sec sec]" );
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}
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}
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return $status;
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}
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/**
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* @see FileBackendStore::concatenate()
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* @return Status
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*/
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protected function doConcatenate( array $params ) {
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$status = Status::newGood();
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$tmpPath = $params['dst']; // convenience
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unset( $params['latest'] ); // sanity
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// Check that the specified temp file is valid...
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wfSuppressWarnings();
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$ok = ( is_file( $tmpPath ) && filesize( $tmpPath ) == 0 );
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wfRestoreWarnings();
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if ( !$ok ) { // not present or not empty
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$status->fatal( 'backend-fail-opentemp', $tmpPath );
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return $status;
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}
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// Get local FS versions of the chunks needed for the concatenation...
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$fsFiles = $this->getLocalReferenceMulti( $params );
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foreach ( $fsFiles as $path => &$fsFile ) {
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if ( !$fsFile ) { // chunk failed to download?
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$fsFile = $this->getLocalReference( array( 'src' => $path ) );
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if ( !$fsFile ) { // retry failed?
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$status->fatal( 'backend-fail-read', $path );
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return $status;
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}
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}
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}
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unset( $fsFile ); // unset reference so we can reuse $fsFile
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// Get a handle for the destination temp file
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$tmpHandle = fopen( $tmpPath, 'ab' );
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if ( $tmpHandle === false ) {
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$status->fatal( 'backend-fail-opentemp', $tmpPath );
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return $status;
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}
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// Build up the temp file using the source chunks (in order)...
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foreach ( $fsFiles as $virtualSource => $fsFile ) {
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// Get a handle to the local FS version
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$sourceHandle = fopen( $fsFile->getPath(), 'rb' );
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if ( $sourceHandle === false ) {
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fclose( $tmpHandle );
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$status->fatal( 'backend-fail-read', $virtualSource );
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return $status;
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}
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// Append chunk to file (pass chunk size to avoid magic quotes)
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if ( !stream_copy_to_stream( $sourceHandle, $tmpHandle ) ) {
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fclose( $sourceHandle );
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fclose( $tmpHandle );
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$status->fatal( 'backend-fail-writetemp', $tmpPath );
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return $status;
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}
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fclose( $sourceHandle );
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}
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if ( !fclose( $tmpHandle ) ) {
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$status->fatal( 'backend-fail-closetemp', $tmpPath );
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return $status;
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}
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clearstatcache(); // temp file changed
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return $status;
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}
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final protected function doPrepare( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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$status = Status::newGood();
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list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
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if ( $dir === null ) {
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$status->fatal( 'backend-fail-invalidpath', $params['dir'] );
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return $status; // invalid storage path
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}
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if ( $shard !== null ) { // confined to a single container/shard
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$status->merge( $this->doPrepareInternal( $fullCont, $dir, $params ) );
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} else { // directory is on several shards
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wfDebug( __METHOD__ . ": iterating over all container shards.\n" );
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list( , $shortCont, ) = self::splitStoragePath( $params['dir'] );
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foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
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$status->merge( $this->doPrepareInternal( "{$fullCont}{$suffix}", $dir, $params ) );
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}
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}
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return $status;
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}
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/**
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* @see FileBackendStore::doPrepare()
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* @return Status
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*/
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protected function doPrepareInternal( $container, $dir, array $params ) {
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return Status::newGood();
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}
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final protected function doSecure( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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$status = Status::newGood();
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list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
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if ( $dir === null ) {
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$status->fatal( 'backend-fail-invalidpath', $params['dir'] );
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return $status; // invalid storage path
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}
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if ( $shard !== null ) { // confined to a single container/shard
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$status->merge( $this->doSecureInternal( $fullCont, $dir, $params ) );
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} else { // directory is on several shards
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wfDebug( __METHOD__ . ": iterating over all container shards.\n" );
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list( , $shortCont, ) = self::splitStoragePath( $params['dir'] );
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foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
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$status->merge( $this->doSecureInternal( "{$fullCont}{$suffix}", $dir, $params ) );
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}
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}
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return $status;
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}
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/**
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* @see FileBackendStore::doSecure()
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* @return Status
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*/
|
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protected function doSecureInternal( $container, $dir, array $params ) {
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return Status::newGood();
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}
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final protected function doPublish( array $params ) {
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$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
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$status = Status::newGood();
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list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
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if ( $dir === null ) {
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$status->fatal( 'backend-fail-invalidpath', $params['dir'] );
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return $status; // invalid storage path
|
|
}
|
|
|
|
if ( $shard !== null ) { // confined to a single container/shard
|
|
$status->merge( $this->doPublishInternal( $fullCont, $dir, $params ) );
|
|
} else { // directory is on several shards
|
|
wfDebug( __METHOD__ . ": iterating over all container shards.\n" );
|
|
list( , $shortCont, ) = self::splitStoragePath( $params['dir'] );
|
|
foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
|
|
$status->merge( $this->doPublishInternal( "{$fullCont}{$suffix}", $dir, $params ) );
|
|
}
|
|
}
|
|
|
|
return $status;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::doPublish()
|
|
* @return Status
|
|
*/
|
|
protected function doPublishInternal( $container, $dir, array $params ) {
|
|
return Status::newGood();
|
|
}
|
|
|
|
final protected function doClean( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$status = Status::newGood();
|
|
|
|
// Recursive: first delete all empty subdirs recursively
|
|
if ( !empty( $params['recursive'] ) && !$this->directoriesAreVirtual() ) {
|
|
$subDirsRel = $this->getTopDirectoryList( array( 'dir' => $params['dir'] ) );
|
|
if ( $subDirsRel !== null ) { // no errors
|
|
foreach ( $subDirsRel as $subDirRel ) {
|
|
$subDir = $params['dir'] . "/{$subDirRel}"; // full path
|
|
$status->merge( $this->doClean( array( 'dir' => $subDir ) + $params ) );
|
|
}
|
|
unset( $subDirsRel ); // free directory for rmdir() on Windows (for FS backends)
|
|
}
|
|
}
|
|
|
|
list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
|
|
if ( $dir === null ) {
|
|
$status->fatal( 'backend-fail-invalidpath', $params['dir'] );
|
|
return $status; // invalid storage path
|
|
}
|
|
|
|
// Attempt to lock this directory...
|
|
$filesLockEx = array( $params['dir'] );
|
|
$scopedLockE = $this->getScopedFileLocks( $filesLockEx, LockManager::LOCK_EX, $status );
|
|
if ( !$status->isOK() ) {
|
|
return $status; // abort
|
|
}
|
|
|
|
if ( $shard !== null ) { // confined to a single container/shard
|
|
$status->merge( $this->doCleanInternal( $fullCont, $dir, $params ) );
|
|
$this->deleteContainerCache( $fullCont ); // purge cache
|
|
} else { // directory is on several shards
|
|
wfDebug( __METHOD__ . ": iterating over all container shards.\n" );
|
|
list( , $shortCont, ) = self::splitStoragePath( $params['dir'] );
|
|
foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
|
|
$status->merge( $this->doCleanInternal( "{$fullCont}{$suffix}", $dir, $params ) );
|
|
$this->deleteContainerCache( "{$fullCont}{$suffix}" ); // purge cache
|
|
}
|
|
}
|
|
|
|
return $status;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::doClean()
|
|
* @return Status
|
|
*/
|
|
protected function doCleanInternal( $container, $dir, array $params ) {
|
|
return Status::newGood();
|
|
}
|
|
|
|
final public function fileExists( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$stat = $this->getFileStat( $params );
|
|
return ( $stat === null ) ? null : (bool)$stat; // null => failure
|
|
}
|
|
|
|
final public function getFileTimestamp( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$stat = $this->getFileStat( $params );
|
|
return $stat ? $stat['mtime'] : false;
|
|
}
|
|
|
|
final public function getFileSize( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$stat = $this->getFileStat( $params );
|
|
return $stat ? $stat['size'] : false;
|
|
}
|
|
|
|
final public function getFileStat( array $params ) {
|
|
$path = self::normalizeStoragePath( $params['src'] );
|
|
if ( $path === null ) {
|
|
return false; // invalid storage path
|
|
}
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$latest = !empty( $params['latest'] ); // use latest data?
|
|
if ( !$this->cheapCache->has( $path, 'stat', self::CACHE_TTL ) ) {
|
|
$this->primeFileCache( array( $path ) ); // check persistent cache
|
|
}
|
|
if ( $this->cheapCache->has( $path, 'stat', self::CACHE_TTL ) ) {
|
|
$stat = $this->cheapCache->get( $path, 'stat' );
|
|
// If we want the latest data, check that this cached
|
|
// value was in fact fetched with the latest available data.
|
|
if ( is_array( $stat ) ) {
|
|
if ( !$latest || $stat['latest'] ) {
|
|
return $stat;
|
|
}
|
|
} elseif ( in_array( $stat, array( 'NOT_EXIST', 'NOT_EXIST_LATEST' ) ) ) {
|
|
if ( !$latest || $stat === 'NOT_EXIST_LATEST' ) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
wfProfileIn( __METHOD__ . '-miss' );
|
|
wfProfileIn( __METHOD__ . '-miss-' . $this->name );
|
|
$stat = $this->doGetFileStat( $params );
|
|
wfProfileOut( __METHOD__ . '-miss-' . $this->name );
|
|
wfProfileOut( __METHOD__ . '-miss' );
|
|
if ( is_array( $stat ) ) { // file exists
|
|
$stat['latest'] = $latest;
|
|
$this->cheapCache->set( $path, 'stat', $stat );
|
|
$this->setFileCache( $path, $stat ); // update persistent cache
|
|
if ( isset( $stat['sha1'] ) ) { // some backends store SHA-1 as metadata
|
|
$this->cheapCache->set( $path, 'sha1',
|
|
array( 'hash' => $stat['sha1'], 'latest' => $latest ) );
|
|
}
|
|
} elseif ( $stat === false ) { // file does not exist
|
|
$this->cheapCache->set( $path, 'stat', $latest ? 'NOT_EXIST_LATEST' : 'NOT_EXIST' );
|
|
$this->cheapCache->set( $path, 'sha1', // the SHA-1 must be false too
|
|
array( 'hash' => false, 'latest' => $latest ) );
|
|
wfDebug( __METHOD__ . ": File $path does not exist.\n" );
|
|
} else { // an error occurred
|
|
wfDebug( __METHOD__ . ": Could not stat file $path.\n" );
|
|
}
|
|
return $stat;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::getFileStat()
|
|
*/
|
|
abstract protected function doGetFileStat( array $params );
|
|
|
|
public function getFileContentsMulti( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
|
|
$params = $this->setConcurrencyFlags( $params );
|
|
$contents = $this->doGetFileContentsMulti( $params );
|
|
|
|
return $contents;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::getFileContentsMulti()
|
|
* @return Array
|
|
*/
|
|
protected function doGetFileContentsMulti( array $params ) {
|
|
$contents = array();
|
|
foreach ( $this->doGetLocalReferenceMulti( $params ) as $path => $fsFile ) {
|
|
wfSuppressWarnings();
|
|
$contents[$path] = $fsFile ? file_get_contents( $fsFile->getPath() ) : false;
|
|
wfRestoreWarnings();
|
|
}
|
|
return $contents;
|
|
}
|
|
|
|
final public function getFileSha1Base36( array $params ) {
|
|
$path = self::normalizeStoragePath( $params['src'] );
|
|
if ( $path === null ) {
|
|
return false; // invalid storage path
|
|
}
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$latest = !empty( $params['latest'] ); // use latest data?
|
|
if ( $this->cheapCache->has( $path, 'sha1', self::CACHE_TTL ) ) {
|
|
$stat = $this->cheapCache->get( $path, 'sha1' );
|
|
// If we want the latest data, check that this cached
|
|
// value was in fact fetched with the latest available data.
|
|
if ( !$latest || $stat['latest'] ) {
|
|
return $stat['hash'];
|
|
}
|
|
}
|
|
wfProfileIn( __METHOD__ . '-miss' );
|
|
wfProfileIn( __METHOD__ . '-miss-' . $this->name );
|
|
$hash = $this->doGetFileSha1Base36( $params );
|
|
wfProfileOut( __METHOD__ . '-miss-' . $this->name );
|
|
wfProfileOut( __METHOD__ . '-miss' );
|
|
$this->cheapCache->set( $path, 'sha1', array( 'hash' => $hash, 'latest' => $latest ) );
|
|
return $hash;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::getFileSha1Base36()
|
|
* @return bool|string
|
|
*/
|
|
protected function doGetFileSha1Base36( array $params ) {
|
|
$fsFile = $this->getLocalReference( $params );
|
|
if ( !$fsFile ) {
|
|
return false;
|
|
} else {
|
|
return $fsFile->getSha1Base36();
|
|
}
|
|
}
|
|
|
|
final public function getFileProps( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$fsFile = $this->getLocalReference( $params );
|
|
$props = $fsFile ? $fsFile->getProps() : FSFile::placeholderProps();
|
|
return $props;
|
|
}
|
|
|
|
final public function getLocalReferenceMulti( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
|
|
$params = $this->setConcurrencyFlags( $params );
|
|
|
|
$fsFiles = array(); // (path => FSFile)
|
|
$latest = !empty( $params['latest'] ); // use latest data?
|
|
// Reuse any files already in process cache...
|
|
foreach ( $params['srcs'] as $src ) {
|
|
$path = self::normalizeStoragePath( $src );
|
|
if ( $path === null ) {
|
|
$fsFiles[$src] = null; // invalid storage path
|
|
} elseif ( $this->expensiveCache->has( $path, 'localRef' ) ) {
|
|
$val = $this->expensiveCache->get( $path, 'localRef' );
|
|
// If we want the latest data, check that this cached
|
|
// value was in fact fetched with the latest available data.
|
|
if ( !$latest || $val['latest'] ) {
|
|
$fsFiles[$src] = $val['object'];
|
|
}
|
|
}
|
|
}
|
|
// Fetch local references of any remaning files...
|
|
$params['srcs'] = array_diff( $params['srcs'], array_keys( $fsFiles ) );
|
|
foreach ( $this->doGetLocalReferenceMulti( $params ) as $path => $fsFile ) {
|
|
$fsFiles[$path] = $fsFile;
|
|
if ( $fsFile ) { // update the process cache...
|
|
$this->expensiveCache->set( $path, 'localRef',
|
|
array( 'object' => $fsFile, 'latest' => $latest ) );
|
|
}
|
|
}
|
|
|
|
return $fsFiles;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::getLocalReferenceMulti()
|
|
* @return Array
|
|
*/
|
|
protected function doGetLocalReferenceMulti( array $params ) {
|
|
return $this->doGetLocalCopyMulti( $params );
|
|
}
|
|
|
|
final public function getLocalCopyMulti( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
|
|
$params = $this->setConcurrencyFlags( $params );
|
|
$tmpFiles = $this->doGetLocalCopyMulti( $params );
|
|
|
|
return $tmpFiles;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::getLocalCopyMulti()
|
|
* @return Array
|
|
*/
|
|
abstract protected function doGetLocalCopyMulti( array $params );
|
|
|
|
/**
|
|
* @see FileBackend::getFileHttpUrl()
|
|
* @return string|null
|
|
*/
|
|
public function getFileHttpUrl( array $params ) {
|
|
return null; // not supported
|
|
}
|
|
|
|
final public function streamFile( array $params ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$status = Status::newGood();
|
|
|
|
$info = $this->getFileStat( $params );
|
|
if ( !$info ) { // let StreamFile handle the 404
|
|
$status->fatal( 'backend-fail-notexists', $params['src'] );
|
|
}
|
|
|
|
// Set output buffer and HTTP headers for stream
|
|
$extraHeaders = isset( $params['headers'] ) ? $params['headers'] : array();
|
|
$res = StreamFile::prepareForStream( $params['src'], $info, $extraHeaders );
|
|
if ( $res == StreamFile::NOT_MODIFIED ) {
|
|
// do nothing; client cache is up to date
|
|
} elseif ( $res == StreamFile::READY_STREAM ) {
|
|
wfProfileIn( __METHOD__ . '-send' );
|
|
wfProfileIn( __METHOD__ . '-send-' . $this->name );
|
|
$status = $this->doStreamFile( $params );
|
|
wfProfileOut( __METHOD__ . '-send-' . $this->name );
|
|
wfProfileOut( __METHOD__ . '-send' );
|
|
if ( !$status->isOK() ) {
|
|
// Per bug 41113, nasty things can happen if bad cache entries get
|
|
// stuck in cache. It's also possible that this error can come up
|
|
// with simple race conditions. Clear out the stat cache to be safe.
|
|
$this->clearCache( array( $params['src'] ) );
|
|
$this->deleteFileCache( $params['src'] );
|
|
trigger_error( "Bad stat cache or race condition for file {$params['src']}." );
|
|
}
|
|
} else {
|
|
$status->fatal( 'backend-fail-stream', $params['src'] );
|
|
}
|
|
|
|
return $status;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::streamFile()
|
|
* @return Status
|
|
*/
|
|
protected function doStreamFile( array $params ) {
|
|
$status = Status::newGood();
|
|
|
|
$fsFile = $this->getLocalReference( $params );
|
|
if ( !$fsFile ) {
|
|
$status->fatal( 'backend-fail-stream', $params['src'] );
|
|
} elseif ( !readfile( $fsFile->getPath() ) ) {
|
|
$status->fatal( 'backend-fail-stream', $params['src'] );
|
|
}
|
|
|
|
return $status;
|
|
}
|
|
|
|
final public function directoryExists( array $params ) {
|
|
list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
|
|
if ( $dir === null ) {
|
|
return false; // invalid storage path
|
|
}
|
|
if ( $shard !== null ) { // confined to a single container/shard
|
|
return $this->doDirectoryExists( $fullCont, $dir, $params );
|
|
} else { // directory is on several shards
|
|
wfDebug( __METHOD__ . ": iterating over all container shards.\n" );
|
|
list( , $shortCont, ) = self::splitStoragePath( $params['dir'] );
|
|
$res = false; // response
|
|
foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
|
|
$exists = $this->doDirectoryExists( "{$fullCont}{$suffix}", $dir, $params );
|
|
if ( $exists ) {
|
|
$res = true;
|
|
break; // found one!
|
|
} elseif ( $exists === null ) { // error?
|
|
$res = null; // if we don't find anything, it is indeterminate
|
|
}
|
|
}
|
|
return $res;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::directoryExists()
|
|
*
|
|
* @param string $container Resolved container name
|
|
* @param string $dir Resolved path relative to container
|
|
* @param array $params
|
|
* @return bool|null
|
|
*/
|
|
abstract protected function doDirectoryExists( $container, $dir, array $params );
|
|
|
|
final public function getDirectoryList( array $params ) {
|
|
list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
|
|
if ( $dir === null ) { // invalid storage path
|
|
return null;
|
|
}
|
|
if ( $shard !== null ) {
|
|
// File listing is confined to a single container/shard
|
|
return $this->getDirectoryListInternal( $fullCont, $dir, $params );
|
|
} else {
|
|
wfDebug( __METHOD__ . ": iterating over all container shards.\n" );
|
|
// File listing spans multiple containers/shards
|
|
list( , $shortCont, ) = self::splitStoragePath( $params['dir'] );
|
|
return new FileBackendStoreShardDirIterator( $this,
|
|
$fullCont, $dir, $this->getContainerSuffixes( $shortCont ), $params );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Do not call this function from places outside FileBackend
|
|
*
|
|
* @see FileBackendStore::getDirectoryList()
|
|
*
|
|
* @param string $container Resolved container name
|
|
* @param string $dir Resolved path relative to container
|
|
* @param array $params
|
|
* @return Traversable|Array|null Returns null on failure
|
|
*/
|
|
abstract public function getDirectoryListInternal( $container, $dir, array $params );
|
|
|
|
final public function getFileList( array $params ) {
|
|
list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
|
|
if ( $dir === null ) { // invalid storage path
|
|
return null;
|
|
}
|
|
if ( $shard !== null ) {
|
|
// File listing is confined to a single container/shard
|
|
return $this->getFileListInternal( $fullCont, $dir, $params );
|
|
} else {
|
|
wfDebug( __METHOD__ . ": iterating over all container shards.\n" );
|
|
// File listing spans multiple containers/shards
|
|
list( , $shortCont, ) = self::splitStoragePath( $params['dir'] );
|
|
return new FileBackendStoreShardFileIterator( $this,
|
|
$fullCont, $dir, $this->getContainerSuffixes( $shortCont ), $params );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Do not call this function from places outside FileBackend
|
|
*
|
|
* @see FileBackendStore::getFileList()
|
|
*
|
|
* @param string $container Resolved container name
|
|
* @param string $dir Resolved path relative to container
|
|
* @param array $params
|
|
* @return Traversable|Array|null Returns null on failure
|
|
*/
|
|
abstract public function getFileListInternal( $container, $dir, array $params );
|
|
|
|
/**
|
|
* Return a list of FileOp objects from a list of operations.
|
|
* Do not call this function from places outside FileBackend.
|
|
*
|
|
* The result must have the same number of items as the input.
|
|
* An exception is thrown if an unsupported operation is requested.
|
|
*
|
|
* @param array $ops Same format as doOperations()
|
|
* @return Array List of FileOp objects
|
|
* @throws MWException
|
|
*/
|
|
final public function getOperationsInternal( array $ops ) {
|
|
$supportedOps = array(
|
|
'store' => 'StoreFileOp',
|
|
'copy' => 'CopyFileOp',
|
|
'move' => 'MoveFileOp',
|
|
'delete' => 'DeleteFileOp',
|
|
'create' => 'CreateFileOp',
|
|
'describe' => 'DescribeFileOp',
|
|
'null' => 'NullFileOp'
|
|
);
|
|
|
|
$performOps = array(); // array of FileOp objects
|
|
// Build up ordered array of FileOps...
|
|
foreach ( $ops as $operation ) {
|
|
$opName = $operation['op'];
|
|
if ( isset( $supportedOps[$opName] ) ) {
|
|
$class = $supportedOps[$opName];
|
|
// Get params for this operation
|
|
$params = $operation;
|
|
// Append the FileOp class
|
|
$performOps[] = new $class( $this, $params );
|
|
} else {
|
|
throw new MWException( "Operation '$opName' is not supported." );
|
|
}
|
|
}
|
|
|
|
return $performOps;
|
|
}
|
|
|
|
/**
|
|
* Get a list of storage paths to lock for a list of operations
|
|
* Returns an array with LockManager::LOCK_UW (shared locks) and
|
|
* LockManager::LOCK_EX (exclusive locks) keys, each corresponding
|
|
* to a list of storage paths to be locked. All returned paths are
|
|
* normalized.
|
|
*
|
|
* @param array $performOps List of FileOp objects
|
|
* @return Array (LockManager::LOCK_UW => path list, LockManager::LOCK_EX => path list)
|
|
*/
|
|
final public function getPathsToLockForOpsInternal( array $performOps ) {
|
|
// Build up a list of files to lock...
|
|
$paths = array( 'sh' => array(), 'ex' => array() );
|
|
foreach ( $performOps as $fileOp ) {
|
|
$paths['sh'] = array_merge( $paths['sh'], $fileOp->storagePathsRead() );
|
|
$paths['ex'] = array_merge( $paths['ex'], $fileOp->storagePathsChanged() );
|
|
}
|
|
// Optimization: if doing an EX lock anyway, don't also set an SH one
|
|
$paths['sh'] = array_diff( $paths['sh'], $paths['ex'] );
|
|
// Get a shared lock on the parent directory of each path changed
|
|
$paths['sh'] = array_merge( $paths['sh'], array_map( 'dirname', $paths['ex'] ) );
|
|
|
|
return array(
|
|
LockManager::LOCK_UW => $paths['sh'],
|
|
LockManager::LOCK_EX => $paths['ex']
|
|
);
|
|
}
|
|
|
|
public function getScopedLocksForOps( array $ops, Status $status ) {
|
|
$paths = $this->getPathsToLockForOpsInternal( $this->getOperationsInternal( $ops ) );
|
|
return array( $this->getScopedFileLocks( $paths, 'mixed', $status ) );
|
|
}
|
|
|
|
final protected function doOperationsInternal( array $ops, array $opts ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$status = Status::newGood();
|
|
|
|
// Fix up custom header name/value pairs...
|
|
$ops = array_map( array( $this, 'stripInvalidHeadersFromOp' ), $ops );
|
|
|
|
// Build up a list of FileOps...
|
|
$performOps = $this->getOperationsInternal( $ops );
|
|
|
|
// Acquire any locks as needed...
|
|
if ( empty( $opts['nonLocking'] ) ) {
|
|
// Build up a list of files to lock...
|
|
$paths = $this->getPathsToLockForOpsInternal( $performOps );
|
|
// Try to lock those files for the scope of this function...
|
|
$scopeLock = $this->getScopedFileLocks( $paths, 'mixed', $status );
|
|
if ( !$status->isOK() ) {
|
|
return $status; // abort
|
|
}
|
|
}
|
|
|
|
// Clear any file cache entries (after locks acquired)
|
|
if ( empty( $opts['preserveCache'] ) ) {
|
|
$this->clearCache();
|
|
}
|
|
|
|
// Load from the persistent file and container caches
|
|
$this->primeFileCache( $performOps );
|
|
$this->primeContainerCache( $performOps );
|
|
|
|
// Actually attempt the operation batch...
|
|
$opts = $this->setConcurrencyFlags( $opts );
|
|
$subStatus = FileOpBatch::attempt( $performOps, $opts, $this->fileJournal );
|
|
|
|
// Merge errors into status fields
|
|
$status->merge( $subStatus );
|
|
$status->success = $subStatus->success; // not done in merge()
|
|
|
|
return $status;
|
|
}
|
|
|
|
final protected function doQuickOperationsInternal( array $ops ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
$status = Status::newGood();
|
|
|
|
// Fix up custom header name/value pairs...
|
|
$ops = array_map( array( $this, 'stripInvalidHeadersFromOp' ), $ops );
|
|
|
|
// Clear any file cache entries
|
|
$this->clearCache();
|
|
|
|
$supportedOps = array( 'create', 'store', 'copy', 'move', 'delete', 'null' );
|
|
$async = ( $this->parallelize === 'implicit' && count( $ops ) > 1 );
|
|
$maxConcurrency = $this->concurrency; // throttle
|
|
|
|
$statuses = array(); // array of (index => Status)
|
|
$fileOpHandles = array(); // list of (index => handle) arrays
|
|
$curFileOpHandles = array(); // current handle batch
|
|
// Perform the sync-only ops and build up op handles for the async ops...
|
|
foreach ( $ops as $index => $params ) {
|
|
if ( !in_array( $params['op'], $supportedOps ) ) {
|
|
throw new MWException( "Operation '{$params['op']}' is not supported." );
|
|
}
|
|
$method = $params['op'] . 'Internal'; // e.g. "storeInternal"
|
|
$subStatus = $this->$method( array( 'async' => $async ) + $params );
|
|
if ( $subStatus->value instanceof FileBackendStoreOpHandle ) { // async
|
|
if ( count( $curFileOpHandles ) >= $maxConcurrency ) {
|
|
$fileOpHandles[] = $curFileOpHandles; // push this batch
|
|
$curFileOpHandles = array();
|
|
}
|
|
$curFileOpHandles[$index] = $subStatus->value; // keep index
|
|
} else { // error or completed
|
|
$statuses[$index] = $subStatus; // keep index
|
|
}
|
|
}
|
|
if ( count( $curFileOpHandles ) ) {
|
|
$fileOpHandles[] = $curFileOpHandles; // last batch
|
|
}
|
|
// Do all the async ops that can be done concurrently...
|
|
foreach ( $fileOpHandles as $fileHandleBatch ) {
|
|
$statuses = $statuses + $this->executeOpHandlesInternal( $fileHandleBatch );
|
|
}
|
|
// Marshall and merge all the responses...
|
|
foreach ( $statuses as $index => $subStatus ) {
|
|
$status->merge( $subStatus );
|
|
if ( $subStatus->isOK() ) {
|
|
$status->success[$index] = true;
|
|
++$status->successCount;
|
|
} else {
|
|
$status->success[$index] = false;
|
|
++$status->failCount;
|
|
}
|
|
}
|
|
|
|
return $status;
|
|
}
|
|
|
|
/**
|
|
* Execute a list of FileBackendStoreOpHandle handles in parallel.
|
|
* The resulting Status object fields will correspond
|
|
* to the order in which the handles where given.
|
|
*
|
|
* @param array $handles List of FileBackendStoreOpHandle objects
|
|
* @return Array Map of Status objects
|
|
* @throws MWException
|
|
*/
|
|
final public function executeOpHandlesInternal( array $fileOpHandles ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
foreach ( $fileOpHandles as $fileOpHandle ) {
|
|
if ( !( $fileOpHandle instanceof FileBackendStoreOpHandle ) ) {
|
|
throw new MWException( "Given a non-FileBackendStoreOpHandle object." );
|
|
} elseif ( $fileOpHandle->backend->getName() !== $this->getName() ) {
|
|
throw new MWException( "Given a FileBackendStoreOpHandle for the wrong backend." );
|
|
}
|
|
}
|
|
$res = $this->doExecuteOpHandlesInternal( $fileOpHandles );
|
|
foreach ( $fileOpHandles as $fileOpHandle ) {
|
|
$fileOpHandle->closeResources();
|
|
}
|
|
return $res;
|
|
}
|
|
|
|
/**
|
|
* @see FileBackendStore::executeOpHandlesInternal()
|
|
* @param array $fileOpHandles
|
|
* @throws MWException
|
|
* @return Array List of corresponding Status objects
|
|
*/
|
|
protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
|
|
foreach ( $fileOpHandles as $fileOpHandle ) { // OK if empty
|
|
throw new MWException( "This backend supports no asynchronous operations." );
|
|
}
|
|
return array();
|
|
}
|
|
|
|
/**
|
|
* Strip long HTTP headers from a file operation.
|
|
* Most headers are just numbers, but some are allowed to be long.
|
|
* This function is useful for cleaning up headers and avoiding backend
|
|
* specific errors, especially in the middle of batch file operations.
|
|
*
|
|
* @param array $op Same format as doOperation()
|
|
* @return Array
|
|
*/
|
|
protected function stripInvalidHeadersFromOp( array $op ) {
|
|
static $longs = array( 'Content-Disposition' );
|
|
if ( isset( $op['headers'] ) ) { // op sets HTTP headers
|
|
foreach ( $op['headers'] as $name => $value ) {
|
|
$maxHVLen = in_array( $name, $longs ) ? INF : 255;
|
|
if ( strlen( $name ) > 255 || strlen( $value ) > $maxHVLen ) {
|
|
trigger_error( "Header '$name: $value' is too long." );
|
|
unset( $op['headers'][$name] );
|
|
} elseif ( !strlen( $value ) ) {
|
|
$op['headers'][$name] = ''; // null/false => ""
|
|
}
|
|
}
|
|
}
|
|
return $op;
|
|
}
|
|
|
|
final public function preloadCache( array $paths ) {
|
|
$fullConts = array(); // full container names
|
|
foreach ( $paths as $path ) {
|
|
list( $fullCont, , ) = $this->resolveStoragePath( $path );
|
|
$fullConts[] = $fullCont;
|
|
}
|
|
// Load from the persistent file and container caches
|
|
$this->primeContainerCache( $fullConts );
|
|
$this->primeFileCache( $paths );
|
|
}
|
|
|
|
final public function clearCache( array $paths = null ) {
|
|
if ( is_array( $paths ) ) {
|
|
$paths = array_map( 'FileBackend::normalizeStoragePath', $paths );
|
|
$paths = array_filter( $paths, 'strlen' ); // remove nulls
|
|
}
|
|
if ( $paths === null ) {
|
|
$this->cheapCache->clear();
|
|
$this->expensiveCache->clear();
|
|
} else {
|
|
foreach ( $paths as $path ) {
|
|
$this->cheapCache->clear( $path );
|
|
$this->expensiveCache->clear( $path );
|
|
}
|
|
}
|
|
$this->doClearCache( $paths );
|
|
}
|
|
|
|
/**
|
|
* Clears any additional stat caches for storage paths
|
|
*
|
|
* @see FileBackend::clearCache()
|
|
*
|
|
* @param array $paths Storage paths (optional)
|
|
* @return void
|
|
*/
|
|
protected function doClearCache( array $paths = null ) {}
|
|
|
|
/**
|
|
* Is this a key/value store where directories are just virtual?
|
|
* Virtual directories exists in so much as files exists that are
|
|
* prefixed with the directory path followed by a forward slash.
|
|
*
|
|
* @return bool
|
|
*/
|
|
abstract protected function directoriesAreVirtual();
|
|
|
|
/**
|
|
* Check if a container name is valid.
|
|
* This checks for for length and illegal characters.
|
|
*
|
|
* @param string $container
|
|
* @return bool
|
|
*/
|
|
final protected static function isValidContainerName( $container ) {
|
|
// This accounts for Swift and S3 restrictions while leaving room
|
|
// for things like '.xxx' (hex shard chars) or '.seg' (segments).
|
|
// This disallows directory separators or traversal characters.
|
|
// Note that matching strings URL encode to the same string;
|
|
// in Swift, the length restriction is *after* URL encoding.
|
|
return preg_match( '/^[a-z0-9][a-z0-9-_]{0,199}$/i', $container );
|
|
}
|
|
|
|
/**
|
|
* Splits a storage path into an internal container name,
|
|
* an internal relative file name, and a container shard suffix.
|
|
* Any shard suffix is already appended to the internal container name.
|
|
* This also checks that the storage path is valid and within this backend.
|
|
*
|
|
* If the container is sharded but a suffix could not be determined,
|
|
* this means that the path can only refer to a directory and can only
|
|
* be scanned by looking in all the container shards.
|
|
*
|
|
* @param string $storagePath
|
|
* @return Array (container, path, container suffix) or (null, null, null) if invalid
|
|
*/
|
|
final protected function resolveStoragePath( $storagePath ) {
|
|
list( $backend, $container, $relPath ) = self::splitStoragePath( $storagePath );
|
|
if ( $backend === $this->name ) { // must be for this backend
|
|
$relPath = self::normalizeContainerPath( $relPath );
|
|
if ( $relPath !== null ) {
|
|
// Get shard for the normalized path if this container is sharded
|
|
$cShard = $this->getContainerShard( $container, $relPath );
|
|
// Validate and sanitize the relative path (backend-specific)
|
|
$relPath = $this->resolveContainerPath( $container, $relPath );
|
|
if ( $relPath !== null ) {
|
|
// Prepend any wiki ID prefix to the container name
|
|
$container = $this->fullContainerName( $container );
|
|
if ( self::isValidContainerName( $container ) ) {
|
|
// Validate and sanitize the container name (backend-specific)
|
|
$container = $this->resolveContainerName( "{$container}{$cShard}" );
|
|
if ( $container !== null ) {
|
|
return array( $container, $relPath, $cShard );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return array( null, null, null );
|
|
}
|
|
|
|
/**
|
|
* Like resolveStoragePath() except null values are returned if
|
|
* the container is sharded and the shard could not be determined
|
|
* or if the path ends with '/'. The later case is illegal for FS
|
|
* backends and can confuse listings for object store backends.
|
|
*
|
|
* This function is used when resolving paths that must be valid
|
|
* locations for files. Directory and listing functions should
|
|
* generally just use resolveStoragePath() instead.
|
|
*
|
|
* @see FileBackendStore::resolveStoragePath()
|
|
*
|
|
* @param string $storagePath
|
|
* @return Array (container, path) or (null, null) if invalid
|
|
*/
|
|
final protected function resolveStoragePathReal( $storagePath ) {
|
|
list( $container, $relPath, $cShard ) = $this->resolveStoragePath( $storagePath );
|
|
if ( $cShard !== null && substr( $relPath, -1 ) !== '/' ) {
|
|
return array( $container, $relPath );
|
|
}
|
|
return array( null, null );
|
|
}
|
|
|
|
/**
|
|
* Get the container name shard suffix for a given path.
|
|
* Any empty suffix means the container is not sharded.
|
|
*
|
|
* @param string $container Container name
|
|
* @param string $relPath Storage path relative to the container
|
|
* @return string|null Returns null if shard could not be determined
|
|
*/
|
|
final protected function getContainerShard( $container, $relPath ) {
|
|
list( $levels, $base, $repeat ) = $this->getContainerHashLevels( $container );
|
|
if ( $levels == 1 || $levels == 2 ) {
|
|
// Hash characters are either base 16 or 36
|
|
$char = ( $base == 36 ) ? '[0-9a-z]' : '[0-9a-f]';
|
|
// Get a regex that represents the shard portion of paths.
|
|
// The concatenation of the captures gives us the shard.
|
|
if ( $levels === 1 ) { // 16 or 36 shards per container
|
|
$hashDirRegex = '(' . $char . ')';
|
|
} else { // 256 or 1296 shards per container
|
|
if ( $repeat ) { // verbose hash dir format (e.g. "a/ab/abc")
|
|
$hashDirRegex = $char . '/(' . $char . '{2})';
|
|
} else { // short hash dir format (e.g. "a/b/c")
|
|
$hashDirRegex = '(' . $char . ')/(' . $char . ')';
|
|
}
|
|
}
|
|
// Allow certain directories to be above the hash dirs so as
|
|
// to work with FileRepo (e.g. "archive/a/ab" or "temp/a/ab").
|
|
// They must be 2+ chars to avoid any hash directory ambiguity.
|
|
$m = array();
|
|
if ( preg_match( "!^(?:[^/]{2,}/)*$hashDirRegex(?:/|$)!", $relPath, $m ) ) {
|
|
return '.' . implode( '', array_slice( $m, 1 ) );
|
|
}
|
|
return null; // failed to match
|
|
}
|
|
return ''; // no sharding
|
|
}
|
|
|
|
/**
|
|
* Check if a storage path maps to a single shard.
|
|
* Container dirs like "a", where the container shards on "x/xy",
|
|
* can reside on several shards. Such paths are tricky to handle.
|
|
*
|
|
* @param string $storagePath Storage path
|
|
* @return bool
|
|
*/
|
|
final public function isSingleShardPathInternal( $storagePath ) {
|
|
list( , , $shard ) = $this->resolveStoragePath( $storagePath );
|
|
return ( $shard !== null );
|
|
}
|
|
|
|
/**
|
|
* Get the sharding config for a container.
|
|
* If greater than 0, then all file storage paths within
|
|
* the container are required to be hashed accordingly.
|
|
*
|
|
* @param string $container
|
|
* @return Array (integer levels, integer base, repeat flag) or (0, 0, false)
|
|
*/
|
|
final protected function getContainerHashLevels( $container ) {
|
|
if ( isset( $this->shardViaHashLevels[$container] ) ) {
|
|
$config = $this->shardViaHashLevels[$container];
|
|
$hashLevels = (int)$config['levels'];
|
|
if ( $hashLevels == 1 || $hashLevels == 2 ) {
|
|
$hashBase = (int)$config['base'];
|
|
if ( $hashBase == 16 || $hashBase == 36 ) {
|
|
return array( $hashLevels, $hashBase, $config['repeat'] );
|
|
}
|
|
}
|
|
}
|
|
return array( 0, 0, false ); // no sharding
|
|
}
|
|
|
|
/**
|
|
* Get a list of full container shard suffixes for a container
|
|
*
|
|
* @param string $container
|
|
* @return Array
|
|
*/
|
|
final protected function getContainerSuffixes( $container ) {
|
|
$shards = array();
|
|
list( $digits, $base ) = $this->getContainerHashLevels( $container );
|
|
if ( $digits > 0 ) {
|
|
$numShards = pow( $base, $digits );
|
|
for ( $index = 0; $index < $numShards; $index++ ) {
|
|
$shards[] = '.' . wfBaseConvert( $index, 10, $base, $digits );
|
|
}
|
|
}
|
|
return $shards;
|
|
}
|
|
|
|
/**
|
|
* Get the full container name, including the wiki ID prefix
|
|
*
|
|
* @param string $container
|
|
* @return string
|
|
*/
|
|
final protected function fullContainerName( $container ) {
|
|
if ( $this->wikiId != '' ) {
|
|
return "{$this->wikiId}-$container";
|
|
} else {
|
|
return $container;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Resolve a container name, checking if it's allowed by the backend.
|
|
* This is intended for internal use, such as encoding illegal chars.
|
|
* Subclasses can override this to be more restrictive.
|
|
*
|
|
* @param string $container
|
|
* @return string|null
|
|
*/
|
|
protected function resolveContainerName( $container ) {
|
|
return $container;
|
|
}
|
|
|
|
/**
|
|
* Resolve a relative storage path, checking if it's allowed by the backend.
|
|
* This is intended for internal use, such as encoding illegal chars or perhaps
|
|
* getting absolute paths (e.g. FS based backends). Note that the relative path
|
|
* may be the empty string (e.g. the path is simply to the container).
|
|
*
|
|
* @param string $container Container name
|
|
* @param string $relStoragePath Storage path relative to the container
|
|
* @return string|null Path or null if not valid
|
|
*/
|
|
protected function resolveContainerPath( $container, $relStoragePath ) {
|
|
return $relStoragePath;
|
|
}
|
|
|
|
/**
|
|
* Get the cache key for a container
|
|
*
|
|
* @param string $container Resolved container name
|
|
* @return string
|
|
*/
|
|
private function containerCacheKey( $container ) {
|
|
return wfMemcKey( 'backend', $this->getName(), 'container', $container );
|
|
}
|
|
|
|
/**
|
|
* Set the cached info for a container
|
|
*
|
|
* @param string $container Resolved container name
|
|
* @param array $val Information to cache
|
|
* @return void
|
|
*/
|
|
final protected function setContainerCache( $container, array $val ) {
|
|
$this->memCache->add( $this->containerCacheKey( $container ), $val, 14 * 86400 );
|
|
}
|
|
|
|
/**
|
|
* Delete the cached info for a container.
|
|
* The cache key is salted for a while to prevent race conditions.
|
|
*
|
|
* @param string $container Resolved container name
|
|
* @return void
|
|
*/
|
|
final protected function deleteContainerCache( $container ) {
|
|
if ( !$this->memCache->set( $this->containerCacheKey( $container ), 'PURGED', 300 ) ) {
|
|
trigger_error( "Unable to delete stat cache for container $container." );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Do a batch lookup from cache for container stats for all containers
|
|
* used in a list of container names, storage paths, or FileOp objects.
|
|
* This loads the persistent cache values into the process cache.
|
|
*
|
|
* @param Array $items
|
|
* @return void
|
|
*/
|
|
final protected function primeContainerCache( array $items ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
|
|
$paths = array(); // list of storage paths
|
|
$contNames = array(); // (cache key => resolved container name)
|
|
// Get all the paths/containers from the items...
|
|
foreach ( $items as $item ) {
|
|
if ( $item instanceof FileOp ) {
|
|
$paths = array_merge( $paths, $item->storagePathsRead() );
|
|
$paths = array_merge( $paths, $item->storagePathsChanged() );
|
|
} elseif ( self::isStoragePath( $item ) ) {
|
|
$paths[] = $item;
|
|
} elseif ( is_string( $item ) ) { // full container name
|
|
$contNames[$this->containerCacheKey( $item )] = $item;
|
|
}
|
|
}
|
|
// Get all the corresponding cache keys for paths...
|
|
foreach ( $paths as $path ) {
|
|
list( $fullCont, , ) = $this->resolveStoragePath( $path );
|
|
if ( $fullCont !== null ) { // valid path for this backend
|
|
$contNames[$this->containerCacheKey( $fullCont )] = $fullCont;
|
|
}
|
|
}
|
|
|
|
$contInfo = array(); // (resolved container name => cache value)
|
|
// Get all cache entries for these container cache keys...
|
|
$values = $this->memCache->getMulti( array_keys( $contNames ) );
|
|
foreach ( $values as $cacheKey => $val ) {
|
|
$contInfo[$contNames[$cacheKey]] = $val;
|
|
}
|
|
|
|
// Populate the container process cache for the backend...
|
|
$this->doPrimeContainerCache( array_filter( $contInfo, 'is_array' ) );
|
|
}
|
|
|
|
/**
|
|
* Fill the backend-specific process cache given an array of
|
|
* resolved container names and their corresponding cached info.
|
|
* Only containers that actually exist should appear in the map.
|
|
*
|
|
* @param array $containerInfo Map of resolved container names to cached info
|
|
* @return void
|
|
*/
|
|
protected function doPrimeContainerCache( array $containerInfo ) {}
|
|
|
|
/**
|
|
* Get the cache key for a file path
|
|
*
|
|
* @param string $path Normalized storage path
|
|
* @return string
|
|
*/
|
|
private function fileCacheKey( $path ) {
|
|
return wfMemcKey( 'backend', $this->getName(), 'file', sha1( $path ) );
|
|
}
|
|
|
|
/**
|
|
* Set the cached stat info for a file path.
|
|
* Negatives (404s) are not cached. By not caching negatives, we can skip cache
|
|
* salting for the case when a file is created at a path were there was none before.
|
|
*
|
|
* @param string $path Storage path
|
|
* @param array $val Stat information to cache
|
|
* @return void
|
|
*/
|
|
final protected function setFileCache( $path, array $val ) {
|
|
$path = FileBackend::normalizeStoragePath( $path );
|
|
if ( $path === null ) {
|
|
return; // invalid storage path
|
|
}
|
|
$age = time() - wfTimestamp( TS_UNIX, $val['mtime'] );
|
|
$ttl = min( 7 * 86400, max( 300, floor( .1 * $age ) ) );
|
|
$this->memCache->add( $this->fileCacheKey( $path ), $val, $ttl );
|
|
}
|
|
|
|
/**
|
|
* Delete the cached stat info for a file path.
|
|
* The cache key is salted for a while to prevent race conditions.
|
|
* Since negatives (404s) are not cached, this does not need to be called when
|
|
* a file is created at a path were there was none before.
|
|
*
|
|
* @param string $path Storage path
|
|
* @return void
|
|
*/
|
|
final protected function deleteFileCache( $path ) {
|
|
$path = FileBackend::normalizeStoragePath( $path );
|
|
if ( $path === null ) {
|
|
return; // invalid storage path
|
|
}
|
|
if ( !$this->memCache->set( $this->fileCacheKey( $path ), 'PURGED', 300 ) ) {
|
|
trigger_error( "Unable to delete stat cache for file $path." );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Do a batch lookup from cache for file stats for all paths
|
|
* used in a list of storage paths or FileOp objects.
|
|
* This loads the persistent cache values into the process cache.
|
|
*
|
|
* @param array $items List of storage paths or FileOps
|
|
* @return void
|
|
*/
|
|
final protected function primeFileCache( array $items ) {
|
|
$section = new ProfileSection( __METHOD__ . "-{$this->name}" );
|
|
|
|
$paths = array(); // list of storage paths
|
|
$pathNames = array(); // (cache key => storage path)
|
|
// Get all the paths/containers from the items...
|
|
foreach ( $items as $item ) {
|
|
if ( $item instanceof FileOp ) {
|
|
$paths = array_merge( $paths, $item->storagePathsRead() );
|
|
$paths = array_merge( $paths, $item->storagePathsChanged() );
|
|
} elseif ( self::isStoragePath( $item ) ) {
|
|
$paths[] = FileBackend::normalizeStoragePath( $item );
|
|
}
|
|
}
|
|
// Get rid of any paths that failed normalization...
|
|
$paths = array_filter( $paths, 'strlen' ); // remove nulls
|
|
// Get all the corresponding cache keys for paths...
|
|
foreach ( $paths as $path ) {
|
|
list( , $rel, ) = $this->resolveStoragePath( $path );
|
|
if ( $rel !== null ) { // valid path for this backend
|
|
$pathNames[$this->fileCacheKey( $path )] = $path;
|
|
}
|
|
}
|
|
// Get all cache entries for these container cache keys...
|
|
$values = $this->memCache->getMulti( array_keys( $pathNames ) );
|
|
foreach ( $values as $cacheKey => $val ) {
|
|
if ( is_array( $val ) ) {
|
|
$path = $pathNames[$cacheKey];
|
|
$this->cheapCache->set( $path, 'stat', $val );
|
|
if ( isset( $val['sha1'] ) ) { // some backends store SHA-1 as metadata
|
|
$this->cheapCache->set( $path, 'sha1',
|
|
array( 'hash' => $val['sha1'], 'latest' => $val['latest'] ) );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set the 'concurrency' option from a list of operation options
|
|
*
|
|
* @param array $opts Map of operation options
|
|
* @return Array
|
|
*/
|
|
final protected function setConcurrencyFlags( array $opts ) {
|
|
$opts['concurrency'] = 1; // off
|
|
if ( $this->parallelize === 'implicit' ) {
|
|
if ( !isset( $opts['parallelize'] ) || $opts['parallelize'] ) {
|
|
$opts['concurrency'] = $this->concurrency;
|
|
}
|
|
} elseif ( $this->parallelize === 'explicit' ) {
|
|
if ( !empty( $opts['parallelize'] ) ) {
|
|
$opts['concurrency'] = $this->concurrency;
|
|
}
|
|
}
|
|
return $opts;
|
|
}
|
|
|
|
/**
|
|
* Get the content type to use in HEAD/GET requests for a file
|
|
*
|
|
* @param string $storagePath
|
|
* @param string|null $content File data
|
|
* @param string|null $fsPath File system path
|
|
* @return MIME type
|
|
*/
|
|
protected function getContentType( $storagePath, $content, $fsPath ) {
|
|
return call_user_func_array( $this->mimeCallback, func_get_args() );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* FileBackendStore helper class for performing asynchronous file operations.
|
|
*
|
|
* For example, calling FileBackendStore::createInternal() with the "async"
|
|
* param flag may result in a Status that contains this object as a value.
|
|
* This class is largely backend-specific and is mostly just "magic" to be
|
|
* passed to FileBackendStore::executeOpHandlesInternal().
|
|
*/
|
|
abstract class FileBackendStoreOpHandle {
|
|
/** @var Array */
|
|
public $params = array(); // params to caller functions
|
|
/** @var FileBackendStore */
|
|
public $backend;
|
|
/** @var Array */
|
|
public $resourcesToClose = array();
|
|
|
|
public $call; // string; name that identifies the function called
|
|
|
|
/**
|
|
* Close all open file handles
|
|
*
|
|
* @return void
|
|
*/
|
|
public function closeResources() {
|
|
array_map( 'fclose', $this->resourcesToClose );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* FileBackendStore helper function to handle listings that span container shards.
|
|
* Do not use this class from places outside of FileBackendStore.
|
|
*
|
|
* @ingroup FileBackend
|
|
*/
|
|
abstract class FileBackendStoreShardListIterator extends FilterIterator {
|
|
/** @var FileBackendStore */
|
|
protected $backend;
|
|
/** @var Array */
|
|
protected $params;
|
|
|
|
protected $container; // string; full container name
|
|
protected $directory; // string; resolved relative path
|
|
|
|
/** @var Array */
|
|
protected $multiShardPaths = array(); // (rel path => 1)
|
|
|
|
/**
|
|
* @param FileBackendStore $backend
|
|
* @param string $container Full storage container name
|
|
* @param string $dir Storage directory relative to container
|
|
* @param array $suffixes List of container shard suffixes
|
|
* @param array $params
|
|
*/
|
|
public function __construct(
|
|
FileBackendStore $backend, $container, $dir, array $suffixes, array $params
|
|
) {
|
|
$this->backend = $backend;
|
|
$this->container = $container;
|
|
$this->directory = $dir;
|
|
$this->params = $params;
|
|
|
|
$iter = new AppendIterator();
|
|
foreach ( $suffixes as $suffix ) {
|
|
$iter->append( $this->listFromShard( $this->container . $suffix ) );
|
|
}
|
|
|
|
parent::__construct( $iter );
|
|
}
|
|
|
|
public function accept() {
|
|
$rel = $this->getInnerIterator()->current(); // path relative to given directory
|
|
$path = $this->params['dir'] . "/{$rel}"; // full storage path
|
|
if ( $this->backend->isSingleShardPathInternal( $path ) ) {
|
|
return true; // path is only on one shard; no issue with duplicates
|
|
} elseif ( isset( $this->multiShardPaths[$rel] ) ) {
|
|
// Don't keep listing paths that are on multiple shards
|
|
return false;
|
|
} else {
|
|
$this->multiShardPaths[$rel] = 1;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public function rewind() {
|
|
parent::rewind();
|
|
$this->multiShardPaths = array();
|
|
}
|
|
|
|
/**
|
|
* Get the list for a given container shard
|
|
*
|
|
* @param string $container Resolved container name
|
|
* @return Iterator
|
|
*/
|
|
abstract protected function listFromShard( $container );
|
|
}
|
|
|
|
/**
|
|
* Iterator for listing directories
|
|
*/
|
|
class FileBackendStoreShardDirIterator extends FileBackendStoreShardListIterator {
|
|
protected function listFromShard( $container ) {
|
|
$list = $this->backend->getDirectoryListInternal(
|
|
$container, $this->directory, $this->params );
|
|
if ( $list === null ) {
|
|
return new ArrayIterator( array() );
|
|
} else {
|
|
return is_array( $list ) ? new ArrayIterator( $list ) : $list;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Iterator for listing regular files
|
|
*/
|
|
class FileBackendStoreShardFileIterator extends FileBackendStoreShardListIterator {
|
|
protected function listFromShard( $container ) {
|
|
$list = $this->backend->getFileListInternal(
|
|
$container, $this->directory, $this->params );
|
|
if ( $list === null ) {
|
|
return new ArrayIterator( array() );
|
|
} else {
|
|
return is_array( $list ) ? new ArrayIterator( $list ) : $list;
|
|
}
|
|
}
|
|
}
|