Expose $wgMaxArticleSize in siteinfo query api

[mediawiki.git] / includes / jobqueue / jobs / RecentChangesUpdateJob.php

<?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
 * @author Aaron Schulz
 * @ingroup JobQueue
 */

/**
 * Job for pruning recent changes
 *
 * @ingroup JobQueue
 * @since 1.25
 */
class RecentChangesUpdateJob extends Job {
        function __construct( Title $title, array $params ) {
                parent::__construct( 'recentChangesUpdate', $title, $params );

                if ( !isset( $params['type'] ) ) {
                        throw new Exception( "Missing 'type' parameter." );
                }

                $this->removeDuplicates = true;
        }

        /**
         * @return RecentChangesUpdateJob
         */
        final public static function newPurgeJob() {
                return new self(
                        SpecialPage::getTitleFor( 'Recentchanges' ), [ 'type' => 'purge' ]
                );
        }

        /**
         * @return RecentChangesUpdateJob
         * @since 1.26
         */
        final public static function newCacheUpdateJob() {
                return new self(
                        SpecialPage::getTitleFor( 'Recentchanges' ), [ 'type' => 'cacheUpdate' ]
                );
        }

        public function run() {
                if ( $this->params['type'] === 'purge' ) {
                        $this->purgeExpiredRows();
                } elseif ( $this->params['type'] === 'cacheUpdate' ) {
                        $this->updateActiveUsers();
                } else {
                        throw new InvalidArgumentException(
                                "Invalid 'type' parameter '{$this->params['type']}'." );
                }

                return true;
        }

        protected function purgeExpiredRows() {
                global $wgRCMaxAge, $wgUpdateRowsPerQuery;

                $lockKey = wfWikiID() . ':recentchanges-prune';

                $dbw = wfGetDB( DB_MASTER );
                if ( !$dbw->lockIsFree( $lockKey, __METHOD__ )
                        || !$dbw->lock( $lockKey, __METHOD__, 1 )
                ) {
                        return; // already in progress
                }

                $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
                do {
                        $rcIds = $dbw->selectFieldValues( 'recentchanges',
                                'rc_id',
                                [ 'rc_timestamp < ' . $dbw->addQuotes( $cutoff ) ],
                                __METHOD__,
                                [ 'LIMIT' => $wgUpdateRowsPerQuery ]
                        );
                        if ( $rcIds ) {
                                $dbw->delete( 'recentchanges', [ 'rc_id' => $rcIds ], __METHOD__ );
                        }
                        // Commit in chunks to avoid slave lag
                        $dbw->commit( __METHOD__, 'flush' );

                        if ( count( $rcIds ) === $wgUpdateRowsPerQuery ) {
                                // There might be more, so try waiting for slaves
                                try {
                                        wfGetLBFactory()->waitForReplication( [ 'timeout' => 3 ] );
                                } catch ( DBReplicationWaitError $e ) {
                                        // Another job will continue anyway
                                        break;
                                }
                        }
                } while ( $rcIds );

                $dbw->unlock( $lockKey, __METHOD__ );
        }

        protected function updateActiveUsers() {
                global $wgActiveUserDays;

                // Users that made edits at least this many days ago are "active"
                $days = $wgActiveUserDays;
                // Pull in the full window of active users in this update
                $window = $wgActiveUserDays * 86400;

                $dbw = wfGetDB( DB_MASTER );
                // JobRunner uses DBO_TRX, but doesn't call begin/commit itself;
                // onTransactionIdle() will run immediately since there is no trx.
                $dbw->onTransactionIdle( function() use ( $dbw, $days, $window ) {
                        // Avoid disconnect/ping() cycle that makes locks fall off
                        $dbw->setSessionOptions( [ 'connTimeout' => 900 ] );

                        $lockKey = wfWikiID() . '-activeusers';
                        if ( !$dbw->lock( $lockKey, __METHOD__, 1 ) ) {
                                return; // exclusive update (avoids duplicate entries)
                        }

                        $nowUnix = time();
                        // Get the last-updated timestamp for the cache
                        $cTime = $dbw->selectField( 'querycache_info',
                                'qci_timestamp',
                                [ 'qci_type' => 'activeusers' ]
                        );
                        $cTimeUnix = $cTime ? wfTimestamp( TS_UNIX, $cTime ) : 1;

                        // Pick the date range to fetch from. This is normally from the last
                        // update to till the present time, but has a limited window for sanity.
                        // If the window is limited, multiple runs are need to fully populate it.
                        $sTimestamp = max( $cTimeUnix, $nowUnix - $days * 86400 );
                        $eTimestamp = min( $sTimestamp + $window, $nowUnix );

                        // Get all the users active since the last update
                        $res = $dbw->select(
                                [ 'recentchanges' ],
                                [ 'rc_user_text', 'lastedittime' => 'MAX(rc_timestamp)' ],
                                [
                                        'rc_user > 0', // actual accounts
                                        'rc_type != ' . $dbw->addQuotes( RC_EXTERNAL ), // no wikidata
                                        'rc_log_type IS NULL OR rc_log_type != ' . $dbw->addQuotes( 'newusers' ),
                                        'rc_timestamp >= ' . $dbw->addQuotes( $dbw->timestamp( $sTimestamp ) ),
                                        'rc_timestamp <= ' . $dbw->addQuotes( $dbw->timestamp( $eTimestamp ) )
                                ],
                                __METHOD__,
                                [
                                        'GROUP BY' => [ 'rc_user_text' ],
                                        'ORDER BY' => 'NULL' // avoid filesort
                                ]
                        );
                        $names = [];
                        foreach ( $res as $row ) {
                                $names[$row->rc_user_text] = $row->lastedittime;
                        }

                        // Rotate out users that have not edited in too long (according to old data set)
                        $dbw->delete( 'querycachetwo',
                                [
                                        'qcc_type' => 'activeusers',
                                        'qcc_value < ' . $dbw->addQuotes( $nowUnix - $days * 86400 ) // TS_UNIX
                                ],
                                __METHOD__
                        );

                        // Find which of the recently active users are already accounted for
                        if ( count( $names ) ) {
                                $res = $dbw->select( 'querycachetwo',
                                        [ 'user_name' => 'qcc_title' ],
                                        [
                                                'qcc_type' => 'activeusers',
                                                'qcc_namespace' => NS_USER,
                                                'qcc_title' => array_keys( $names ) ],
                                        __METHOD__
                                );
                                foreach ( $res as $row ) {
                                        unset( $names[$row->user_name] );
                                }
                        }

                        // Insert the users that need to be added to the list
                        if ( count( $names ) ) {
                                $newRows = [];
                                foreach ( $names as $name => $lastEditTime ) {
                                        $newRows[] = [
                                                'qcc_type' => 'activeusers',
                                                'qcc_namespace' => NS_USER,
                                                'qcc_title' => $name,
                                                'qcc_value' => wfTimestamp( TS_UNIX, $lastEditTime ),
                                                'qcc_namespacetwo' => 0, // unused
                                                'qcc_titletwo' => '' // unused
                                        ];
                                }
                                foreach ( array_chunk( $newRows, 500 ) as $rowBatch ) {
                                        $dbw->insert( 'querycachetwo', $rowBatch, __METHOD__ );
                                        wfGetLBFactory()->waitForReplication();
                                }
                        }

                        // If a transaction was already started, it might have an old
                        // snapshot, so kludge the timestamp range back as needed.
                        $asOfTimestamp = min( $eTimestamp, (int)$dbw->trxTimestamp() );

                        // Touch the data freshness timestamp
                        $dbw->replace( 'querycache_info',
                                [ 'qci_type' ],
                                [ 'qci_type' => 'activeusers',
                                        'qci_timestamp' => $dbw->timestamp( $asOfTimestamp ) ], // not always $now
                                __METHOD__
                        );

                        $dbw->unlock( $lockKey, __METHOD__ );
                } );
        }
}