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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\Exception\MWContentSerializationException;
use MediaWiki\Maintenance\Maintenance;
use MediaWiki\Revision\SlotRecord;
use MediaWiki\Search\SearchUpdate;
use MediaWiki\Title\Title;
use Wikimedia\Rdbms\DatabaseSqlite;
/**
* Rebuild search index table from scratch.
*
* This may take several hours, depending on the database size and server configuration.
* Postgres is trigger-based and should never need rebuilding.
*
* @ingroup Search
* @ingroup Maintenance
*/
class RebuildTextIndex extends Maintenance {
private const RTI_CHUNK_SIZE = 500;
public function __construct() {
parent::__construct();
$this->addDescription( 'Rebuild search index table from scratch' );
}
/** @inheritDoc */
public function getDbType() {
return Maintenance::DB_ADMIN;
}
public function execute() {
// Shouldn't be needed for Postgres
$dbw = $this->getPrimaryDB();
if ( $dbw->getType() == 'postgres' ) {
$this->fatalError( "This script is not needed when using Postgres.\n" );
}
if ( $dbw->getType() == 'sqlite' ) {
if ( !DatabaseSqlite::getFulltextSearchModule() ) {
$this->fatalError( "Your version of SQLite module for PHP doesn't "
. "support full-text search (FTS3).\n" );
}
}
if ( $dbw->getType() == 'mysql' ) {
$this->dropMysqlTextIndex();
$this->clearSearchIndex();
$this->populateSearchIndex();
$this->createMysqlTextIndex();
} else {
$this->clearSearchIndex();
$this->populateSearchIndex();
}
$this->output( "Done.\n" );
}
/**
* Populates the search index with content from all pages
*/
protected function populateSearchIndex() {
$dbw = $this->getPrimaryDB();
$res = $dbw->newSelectQueryBuilder()
->select( [ 'count' => 'MAX(page_id)' ] )
->from( 'page' )
->caller( __METHOD__ )->fetchResultSet();
$s = $res->fetchObject();
$count = $s->count;
$this->output( "Rebuilding index fields for {$count} pages...\n" );
$n = 0;
$revStore = $this->getServiceContainer()->getRevisionStore();
$queryBuilderTemplate = $revStore->newSelectQueryBuilder( $dbw )
->joinPage()
->joinComment();
while ( $n < $count ) {
if ( $n ) {
$this->output( $n . "\n" );
}
$end = $n + self::RTI_CHUNK_SIZE - 1;
$queryBuilder = clone $queryBuilderTemplate;
$res = $queryBuilder->where( [
$dbw->expr( 'page_id', '>=', $n )->and( 'page_id', '<=', $end ),
'page_latest = rev_id'
] )->caller( __METHOD__ )->fetchResultSet();
foreach ( $res as $s ) {
// T268673 Prevent failure of WikiPage.php: Invalid or virtual namespace -1 given
if ( $s->page_namespace < 0 ) {
continue;
}
$title = Title::makeTitle( $s->page_namespace, $s->page_title );
try {
$revRecord = $revStore->newRevisionFromRow( $s );
$content = $revRecord->getContent( SlotRecord::MAIN );
$u = new SearchUpdate( $s->page_id, $title, $content );
$u->doUpdate();
} catch ( MWContentSerializationException $ex ) {
$this->output( "Failed to deserialize content of revision {$s->rev_id} of page "
. "`" . $title->getPrefixedDBkey() . "`!\n" );
}
}
$n += self::RTI_CHUNK_SIZE;
}
}
/**
* (MySQL only) Drops fulltext index before populating the table.
*/
private function dropMysqlTextIndex() {
$dbw = $this->getDB( DB_PRIMARY );
$searchindex = $dbw->tableName( 'searchindex' );
if ( $dbw->indexExists( 'searchindex', 'si_title', __METHOD__ ) ) {
$this->output( "Dropping index...\n" );
$sql = "ALTER TABLE $searchindex DROP INDEX si_title, DROP INDEX si_text";
$dbw->query( $sql, __METHOD__ );
}
}
/**
* (MySQL only) Adds back fulltext index after populating the table.
*/
private function createMysqlTextIndex() {
$dbw = $this->getPrimaryDB();
$searchindex = $dbw->tableName( 'searchindex' );
$this->output( "\nRebuild the index...\n" );
foreach ( [ 'si_title', 'si_text' ] as $field ) {
$sql = "ALTER TABLE $searchindex ADD FULLTEXT $field ($field)";
$dbw->query( $sql, __METHOD__ );
}
}
/**
* Deletes everything from search index.
*/
private function clearSearchIndex() {
$dbw = $this->getPrimaryDB();
$this->output( 'Clearing searchindex table...' );
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'searchindex' )
->where( '*' )
->caller( __METHOD__ )->execute();
$this->output( "Done\n" );
}
}
// @codeCoverageIgnoreStart
$maintClass = RebuildTextIndex::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd