a071365392
* This improve the object store case (with B-Tree container listings and 2-level sharding set up). Change-Id: If75f51fb07cd5df0da455d4e6eafe06d69e8b941
100 lines
3.5 KiB
PHP
100 lines
3.5 KiB
PHP
<?php
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/**
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* External storage in a file backend.
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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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*/
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/**
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* File backend accessable external objects.
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*
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* In this system, each store "location" maps to the name of a file backend.
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* The file backends must be defined in $wgFileBackends and must be global
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* and fully qualified with a global "wikiId" prefix in the configuration.
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*
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* @ingroup ExternalStorage
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* @since 1.21
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*/
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class ExternalStoreMwstore extends ExternalStoreMedium {
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/**
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* The URL returned is of the form of the form mwstore://backend/container/wiki/id
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*
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* @see ExternalStoreMedium::fetchFromURL()
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*/
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public function fetchFromURL( $url ) {
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$be = FileBackendGroup::singleton()->backendFromPath( $url );
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if ( $be instanceof FileBackend ) {
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// We don't need "latest" since objects are immutable and
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// backends should at least have "read-after-create" consistency.
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return $be->getFileContents( array( 'src' => $url ) );
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}
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return false;
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}
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/**
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* Fetch data from given external store URLs.
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* The URL returned is of the form of the form mwstore://backend/container/wiki/id
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*
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* @param array $urls An array of external store URLs
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* @return array A map from url to stored content. Failed results are not represented.
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*/
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public function batchFetchFromURLs( array $urls ) {
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$pathsByBackend = array();
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foreach ( $urls as $url ) {
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$be = FileBackendGroup::singleton()->backendFromPath( $url );
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if ( $be instanceof FileBackend ) {
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$pathsByBackend[$be->getName()][] = $url;
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}
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}
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$blobs = array();
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foreach ( $pathsByBackend as $backendName => $paths ) {
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$be = FileBackendGroup::singleton()->get( $backendName );
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$blobs = $blobs + $be->getFileContentsMulti( array( 'srcs' => $paths ) );
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}
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return $blobs;
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}
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/**
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* @see ExternalStoreMedium::store()
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*/
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public function store( $backend, $data ) {
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$be = FileBackendGroup::singleton()->get( $backend );
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if ( $be instanceof FileBackend ) {
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// Get three random base 36 characters to act as shard directories
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$rand = wfBaseConvert( mt_rand( 0, 46655 ), 10, 36, 3 );
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// Make sure ID is roughly lexicographically increasing for performance
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$id = str_pad( UIDGenerator::newTimestampedUID128( 32 ), 26, '0', STR_PAD_LEFT );
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// Segregate items by wiki ID for the sake of bookkeeping
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$wiki = isset( $this->params['wiki'] ) ? $this->params['wiki'] : wfWikiID();
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$url = $be->getContainerStoragePath( 'data' ) . '/' . rawurlencode( $wiki );
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$url .= ( $be instanceof FSFileBackend )
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? "/{$rand[0]}/{$rand[1]}/{$rand[2]}/{$id}" // keep directories small
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: "/{$rand[0]}/{$rand[1]}/{$id}"; // container sharding is only 2-levels
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$be->prepare( array( 'dir' => dirname( $url ), 'noAccess' => 1, 'noListing' => 1 ) );
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if ( $be->create( array( 'dst' => $url, 'content' => $data ) )->isOK() ) {
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return $url;
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}
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}
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return false;
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}
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}
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