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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 */ // @codeCoverageIgnoreStart require_once __DIR__ . '/Maintenance.php'; // @codeCoverageIgnoreEnd use MediaWiki\MainConfigNames; use Wikimedia\Timestamp\ConvertibleTimestamp; /** * Remove expired objects from the parser cache database. * * By default, this does not need to be run. The default parser cache * backend is CACHE_DB (SqlBagOStuff), and by default that automatically * performs incremental purges in the background of write requests. * * @see {@link MediaWiki\MainConfigSchema::ParserCacheType} * @ingroup Maintenance */ class PurgeParserCache extends Maintenance { /** @var null|string */ private $lastProgress; /** @var null|float */ private $lastTimestamp; /** @var int */ private $tmpCount = 0; /** @var float */ private $usleep = 0; public function __construct() { parent::__construct(); $this->addDescription( "Remove old objects from the parser cache. " . "This only works when the parser cache is in an SQL database." ); $this->addOption( 'expiredate', 'Delete objects expiring before this date.', false, true ); $this->addOption( 'age', 'Delete objects created more than this many seconds ago, assuming ' . '$wgParserCacheExpireTime has remained consistent.', false, true ); $this->addOption( 'dry-run', 'Perform a dry run, to verify age and date calculation.' ); $this->addOption( 'msleep', 'Milliseconds to sleep between purge chunks of $wgUpdateRowsPerQuery.', false, true ); $this->addOption( 'tag', 'Purge a single server only. This feature is designed for use by large wiki farms where ' . 'one has to purge multiple servers concurrently in order to keep up with new writes. ' . 'This requires using the SqlBagOStuff "servers" option in $wgObjectCaches.', false, true ); } public function execute() { $inputDate = $this->getOption( 'expiredate' ); $inputAge = $this->getOption( 'age' ); if ( $inputDate !== null ) { $timestamp = strtotime( $inputDate ); } elseif ( $inputAge !== null ) { $expireTime = (int)$this->getConfig()->get( MainConfigNames::ParserCacheExpireTime ); $timestamp = time() + $expireTime - intval( $inputAge ); } else { $this->fatalError( "Must specify either --expiredate or --age" ); } $this->usleep = 1e3 * $this->getOption( 'msleep', 0 ); $this->lastTimestamp = microtime( true ); $humanDate = ConvertibleTimestamp::convert( TS_RFC2822, $timestamp ); if ( $this->hasOption( 'dry-run' ) ) { $this->fatalError( "\nDry run mode, would delete objects having an expiry before " . $humanDate . "\n" ); } $this->output( "Deleting objects expiring before " . $humanDate . "\n" ); $pc = $this->getServiceContainer()->getParserCache()->getCacheStorage(); $success = $pc->deleteObjectsExpiringBefore( $timestamp, [ $this, 'showProgressAndWait' ], INF, // Note that "0" can be a valid server tag, and must not be discarded or changed to null. $this->getOption( 'tag', null ) ); if ( !$success ) { $this->fatalError( "\nCannot purge this kind of parser cache." ); } $this->showProgressAndWait( 100 ); $this->output( "\nDone\n" ); } public function showProgressAndWait( $percent ) { // Parser caches involve mostly-unthrottled writes of large blobs. This is sometimes prone // to replication lag. As such, while our purge queries are simple primary key deletes, // we want to avoid adding significant load to the replication stream, by being // proactively graceful with these sleeps between each batch. // The reason we don't explicitly wait for replication is that that would require the script // to be aware of cross-dc replicas, which we prefer not to, and waiting for replication // and confirmation latency might actually be *too* graceful and take so long that the // purge script would not be able to finish within 24 hours for large wiki farms. // (T150124). usleep( $this->usleep ); $this->tmpCount++; $percentString = sprintf( "%.1f", $percent ); if ( $percentString === $this->lastProgress ) { // Only print a line if we've progressed >= 0.1% since the last printed line. // This does not mean every 0.1% step is printed since we only run this callback // once after a deletion batch. How often and how many lines we print depends on the // batch size (SqlBagOStuff::deleteObjectsExpiringBefore, $wgUpdateRowsPerQuery), // and on how many table rows there are. return; } $now = microtime( true ); $sec = sprintf( "%.1f", $now - $this->lastTimestamp ); // Give a sense of how much time is spent in the delete operations vs the sleep time, // by recording the number of iterations we've completed since the last progress update. $this->output( "... {$percentString}% done (+{$this->tmpCount} iterations in {$sec}s)\n" ); $this->lastProgress = $percentString; $this->tmpCount = 0; $this->lastTimestamp = $now; } } // @codeCoverageIgnoreStart $maintClass = PurgeParserCache::class; require_once RUN_MAINTENANCE_IF_MAIN; // @codeCoverageIgnoreEnd
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