wikimedia/mediawiki-core

<?php
/**
 * Take page text out of an XML dump file and perform some operation on it.
 * Used as a base class for CompareParsers.
 * We implement below the simple task of searching inside a dump.
 *
 * Copyright © 2011 Platonides
 * https://www.mediawiki.org/
 *
 * 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
 */

use MediaWiki\MainConfigNames;
use MediaWiki\Permissions\UltimateAuthority;
use MediaWiki\Revision\SlotRecord;
use MediaWiki\Settings\SettingsBuilder;
use MediaWiki\Title\Title;
use MediaWiki\User\User;

// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd

/**
 * Base class for iterating over a dump.
 *
 * @ingroup Maintenance
 */
abstract class DumpIterator extends Maintenance {
    /** @var int */
    private $count = 0;
    /** @var float */
    private $startTime;
    /** @var string|null|false */
    private $from;

    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Does something with a dump' );
        $this->addOption( 'file', 'File with text to run.', false, true );
        $this->addOption( 'dump', 'XML dump to execute all revisions.', false, true );
        $this->addOption( 'from', 'Article from XML dump to start from.', false, true );
    }

    public function execute() {
        if ( !( $this->hasOption( 'file' ) xor $this->hasOption( 'dump' ) ) ) {
            $this->fatalError( "You must provide a file or dump" );
        }

        $this->checkOptions();

        if ( $this->hasOption( 'file' ) ) {
            $file = $this->getOption( 'file' );
            $revision = new WikiRevision();
            $text = file_get_contents( $file );
            $title = Title::newFromText( rawurldecode( basename( $file, '.txt' ) ) );
            $revision->setTitle( $title );
            $content = ContentHandler::makeContent( $text, $title );
            $revision->setContent( SlotRecord::MAIN, $content );

            $this->from = false;
            $this->handleRevision( $revision );

            return;
        }

        $this->startTime = microtime( true );

        if ( $this->getOption( 'dump' ) == '-' ) {
            $source = new ImportStreamSource( $this->getStdin() );
        } else {
            $this->fatalError( "Sorry, I don't support dump filenames yet. "
                . "Use - and provide it on stdin on the meantime." );
        }

        $user = User::newSystemUser( User::MAINTENANCE_SCRIPT_USER, [ 'steal' => true ] );

        $importer = $this->getServiceContainer()
            ->getWikiImporterFactory()
            ->getWikiImporter( $source, new UltimateAuthority( $user ) );

        $importer->setRevisionCallback(
            [ $this, 'handleRevision' ] );
        $importer->setNoticeCallback( static function ( $msg, $params ) {
            echo wfMessage( $msg, $params )->text() . "\n";
        } );

        $this->from = $this->getOption( 'from', null );
        $this->count = 0;
        $importer->doImport();

        $this->conclusions();

        $delta = microtime( true ) - $this->startTime;
        $this->error( "Done {$this->count} revisions in " . round( $delta, 2 ) . " seconds " );
        if ( $delta > 0 ) {
            $this->error( round( $this->count / $delta, 2 ) . " pages/sec" );
        }

        # Perform the memory_get_peak_usage() when all the other data has been
        # output so there's no damage if it dies. It is only available since
        # 5.2.0 (since 5.2.1 if you haven't compiled with --enable-memory-limit)
        $this->error( "Memory peak usage of " . memory_get_peak_usage() . " bytes\n" );
    }

    public function finalSetup( SettingsBuilder $settingsBuilder ) {
        parent::finalSetup( $settingsBuilder );

        if ( $this->getDbType() == Maintenance::DB_NONE ) {
            // TODO: Allow hooks to be registered via SettingsBuilder as well!
            //       This matches the idea of unifying SettingsBuilder with ExtensionRegistry.
            // phpcs:disable MediaWiki.Usage.DeprecatedGlobalVariables.Deprecated$wgHooks
            global $wgHooks;
            $wgHooks['InterwikiLoadPrefix'][] = 'DumpIterator::disableInterwikis';

            $settingsBuilder->putConfigValues( [
                MainConfigNames::UseDatabaseMessages => false,
                MainConfigNames::LocalisationCacheConf => [ 'storeClass' => LCStoreNull::class ],
            ] );
        }
    }

    public static function disableInterwikis( $prefix, &$data ) {
        # Title::newFromText will check on each namespaced article if it's an interwiki.
        # We always answer that it is not.

        return false;
    }

    /**
     * Callback function for each revision, child classes should override
     * processRevision instead.
     * @param WikiRevision $rev
     */
    public function handleRevision( $rev ) {
        $title = $rev->getTitle();
        if ( !$title ) {
            $this->error( "Got bogus revision with null title!" );

            return;
        }

        $this->count++;
        if ( $this->from !== false ) {
            if ( $this->from != $title ) {
                return;
            }
            $this->output( "Skipped " . ( $this->count - 1 ) . " pages\n" );

            $this->count = 1;
            $this->from = null;
        }

        $this->processRevision( $rev );
    }

    /**
     * Stub function for processing additional options
     */
    public function checkOptions() {
    }

    /**
     * Stub function for giving data about what was computed
     */
    public function conclusions() {
    }

    /**
     * Core function which does whatever the maintenance script is designed to do
     *
     * @param WikiRevision $rev
     */
    abstract public function processRevision( WikiRevision $rev );
}

/**
 * Maintenance script that runs a regex in the revisions from a dump.
 *
 * @ingroup Maintenance
 */
class SearchDump extends DumpIterator {

    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Runs a regex in the revisions from a dump' );
        $this->addOption( 'regex', 'Searching regex', true, true );
    }

    public function getDbType() {
        return Maintenance::DB_NONE;
    }

    /**
     * @param WikiRevision $rev
     */
    public function processRevision( WikiRevision $rev ) {
        if ( preg_match( $this->getOption( 'regex' ), $rev->getContent()->getTextForSearchIndex() ) ) {
            $this->output( $rev->getTitle() . " matches at edit from " . $rev->getTimestamp() . "\n" );
        }
    }
}

// @codeCoverageIgnoreStart
$maintClass = SearchDump::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd