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<?php /** * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ use MediaWiki\FileBackend\FileBackendGroup; use MediaWiki\MediaWikiServices; use MediaWiki\WikiMap\WikiMap; use Wikimedia\FileBackend\FileBackend; use Wikimedia\FileBackend\FSFileBackend; /** * External storage in a FileBackend. * * In this system, each store "location" maps to the name of a file backend. * The file backends must be defined in $wgFileBackends and must be global * and fully qualified with a global "wikiId" prefix in the configuration. * * @see ExternalStoreAccess * @ingroup ExternalStorage * @since 1.21 */ class ExternalStoreMwstore extends ExternalStoreMedium { /** @var FileBackendGroup */ private $fbGroup; /** * @see ExternalStoreMedium::__construct() * @param array $params Additional parameters include: * - fbGroup: a FileBackendGroup instance */ public function __construct( array $params ) { parent::__construct( $params ); if ( !isset( $params['fbGroup'] ) || !( $params['fbGroup'] instanceof FileBackendGroup ) ) { throw new InvalidArgumentException( "FileBackendGroup required in 'fbGroup' field." ); } $this->fbGroup = $params['fbGroup']; } /** * Fetch data from a given external store URL * * @see ExternalStoreMedium::fetchFromURL() * @param string $url An external store URL in the form of mwstore://backend/container/wiki/id * @return string|bool */ public function fetchFromURL( $url ) { $be = $this->fbGroup->backendFromPath( $url ); if ( $be instanceof FileBackend ) { // We don't need "latest" since objects are immutable and // backends should at least have "read-after-create" consistency. return $be->getFileContents( [ 'src' => $url ] ); } return false; } /** * Fetch data from given external store URLs. * The URLs are in the form of mwstore://backend/container/wiki/id * * @param array $urls An array of external store URLs * @return array A map from url to stored content. Failed results are not represented. */ public function batchFetchFromURLs( array $urls ) { $pathsByBackend = []; foreach ( $urls as $url ) { $be = $this->fbGroup->backendFromPath( $url ); if ( $be instanceof FileBackend ) { $pathsByBackend[$be->getName()][] = $url; } } $blobs = []; foreach ( $pathsByBackend as $backendName => $paths ) { $be = $this->fbGroup->get( $backendName ); $blobs += $be->getFileContentsMulti( [ 'srcs' => $paths ] ); } return $blobs; } public function store( $backend, $data ) { $be = $this->fbGroup->get( $backend ); // Get three random base 36 characters to act as shard directories $rand = Wikimedia\base_convert( (string)mt_rand( 0, 46655 ), 10, 36, 3 ); // Make sure ID is roughly lexicographically increasing for performance $gen = MediaWikiServices::getInstance()->getGlobalIdGenerator(); $id = str_pad( $gen->newTimestampedUID128( 32 ), 26, '0', STR_PAD_LEFT ); // Segregate items by DB domain ID for the sake of bookkeeping $domain = $this->isDbDomainExplicit ? $this->dbDomain // @FIXME: this does not include the schema for b/c but it ideally should : WikiMap::getWikiIdFromDbDomain( $this->dbDomain ); $url = $be->getContainerStoragePath( 'data' ) . '/' . rawurlencode( $domain ); // Use directory/container sharding $url .= ( $be instanceof FSFileBackend ) ? "/{$rand[0]}/{$rand[1]}/{$rand[2]}/{$id}" // keep directories small : "/{$rand[0]}/{$rand[1]}/{$id}"; // container sharding is only 2-levels $be->prepare( [ 'dir' => dirname( $url ), 'noAccess' => 1, 'noListing' => 1 ] ); $status = $be->create( [ 'dst' => $url, 'content' => $data ] ); if ( $status->isOK() ) { return $url; } throw new ExternalStoreException( __METHOD__ . ": operation failed: $status" ); } public function isReadOnly( $backend ) { if ( parent::isReadOnly( $backend ) ) { return true; } $be = $this->fbGroup->get( $backend ); return $be->isReadOnly(); } }
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