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<?php /** * Test revision text compression and decompression. * * 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 * @ingroup Maintenance ExternalStorage */ use MediaWiki\Revision\RevisionRecord; use MediaWiki\Revision\SlotRecord; use MediaWiki\Title\Title; // @codeCoverageIgnoreStart require_once __DIR__ . '/../Maintenance.php'; // @codeCoverageIgnoreEnd class TestCompression extends Maintenance { public function __construct() { parent::__construct(); $this->addArg( 'title', 'The page to test' ); $this->addOption( 'type', 'The HistoryBlob subclass to use', false, true ); $this->addOption( 'start', 'The start date', false, true ); $this->addOption( 'limit', 'Maximum number of revisions to process', false, true ); } public function execute() { $lang = $this->getServiceContainer()->getLanguageFactory()->getLanguage( 'en' ); $title = Title::newFromText( $this->getArg( 0 ) ); if ( $this->hasOption( 'start' ) ) { $start = wfTimestamp( TS_MW, strtotime( $this->getOption( 'start' ) ) ); echo "Starting from " . $lang->timeanddate( $start ) . "\n"; } else { $start = '19700101000000'; } if ( $this->hasOption( 'limit' ) ) { $limit = $this->getOption( 'limit' ); $untilHappy = false; } else { $limit = 1000; $untilHappy = true; } $type = $this->getOption( 'type', ConcatenatedGzipHistoryBlob::class ); $dbr = $this->getReplicaDB(); $revStore = $this->getServiceContainer()->getRevisionStore(); $res = $revStore->newSelectQueryBuilder( $dbr ) ->joinComment() ->joinPage() ->where( [ 'page_namespace' => $title->getNamespace(), 'page_title' => $title->getDBkey(), $dbr->expr( 'rev_timestamp', '>', $dbr->timestamp( $start ) ), ] ) ->limit( $limit ) ->caller( __FILE__ )->fetchResultSet(); $blob = new $type; $hashes = []; $keys = []; $uncompressedSize = 0; $t = -microtime( true ); foreach ( $res as $row ) { $revRecord = $revStore->newRevisionFromRow( $row ); $text = $revRecord->getSlot( SlotRecord::MAIN, RevisionRecord::RAW ) ->getContent() ->serialize(); $uncompressedSize += strlen( $text ); $hashes[$row->rev_id] = md5( $text ); $keys[$row->rev_id] = $blob->addItem( $text ); if ( $untilHappy && !$blob->isHappy() ) { break; } } $serialized = serialize( $blob ); $t += microtime( true ); # print_r( $blob->mDiffMap ); printf( "%s\nCompression ratio for %d revisions: %5.2f, %s -> %d\n", $type, count( $hashes ), $uncompressedSize / strlen( $serialized ), $lang->formatSize( $uncompressedSize ), strlen( $serialized ) ); printf( "Compression time: %5.2f ms\n", $t * 1000 ); $t = -microtime( true ); $blob = unserialize( $serialized ); foreach ( $keys as $id => $key ) { $text = $blob->getItem( $key ); if ( md5( $text ) != $hashes[$id] ) { echo "Content hash mismatch for rev_id $id\n"; # var_dump( $text ); } } $t += microtime( true ); printf( "Decompression time: %5.2f ms\n", $t * 1000 ); } } // @codeCoverageIgnoreStart $maintClass = TestCompression::class; require_once RUN_MAINTENANCE_IF_MAIN; // @codeCoverageIgnoreEnd
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