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testCompression.php
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testCompression.php
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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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