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<?php
/**
* 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.
*
* 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
* @todo document
*/
require_once __DIR__ . '/Maintenance.php';
/**
* Maintenance script that rebuilds search index table from scratch.
*
* @ingroup Maintenance
*/
class RebuildTextIndex extends Maintenance {
const RTI_CHUNK_SIZE = 500;
/**
* @var DatabaseBase
*/
private $db;
public function __construct() {
parent::__construct();
$this->addDescription( 'Rebuild search index table from scratch' );
}
public function getDbType() {
return Maintenance::DB_ADMIN;
}
public function execute() {
// Shouldn't be needed for Postgres
$this->db = $this->getDB( DB_MASTER );
if ( $this->db->getType() == 'postgres' ) {
$this->error( "This script is not needed when using Postgres.\n", true );
}
if ( $this->db->getType() == 'sqlite' ) {
if ( !DatabaseSqlite::getFulltextSearchModule() ) {
$this->error( "Your version of SQLite module for PHP doesn't "
. "support full-text search (FTS3).\n", true );
}
if ( !$this->db->checkForEnabledSearch() ) {
$this->error( "Your database schema is not configured for "
. "full-text search support. Run update.php.\n", true );
}
}
if ( $this->db->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() {
$res = $this->db->select( 'page', 'MAX(page_id) AS count' );
$s = $this->db->fetchObject( $res );
$count = $s->count;
$this->output( "Rebuilding index fields for {$count} pages...\n" );
$n = 0;
$fields = array_merge(
Revision::selectPageFields(),
Revision::selectFields(),
Revision::selectTextFields()
);
while ( $n < $count ) {
if ( $n ) {
$this->output( $n . "\n" );
}
$end = $n + self::RTI_CHUNK_SIZE - 1;
$res = $this->db->select( [ 'page', 'revision', 'text' ], $fields,
[ "page_id BETWEEN $n AND $end", 'page_latest = rev_id', 'rev_text_id = old_id' ],
__METHOD__
);
foreach ( $res as $s ) {
try {
$title = Title::makeTitle( $s->page_namespace, $s->page_title );
$rev = new Revision( $s );
$content = $rev->getContent();
$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() {
$searchindex = $this->db->tableName( 'searchindex' );
if ( $this->db->indexExists( 'searchindex', 'si_title', __METHOD__ ) ) {
$this->output( "Dropping index...\n" );
$sql = "ALTER TABLE $searchindex DROP INDEX si_title, DROP INDEX si_text";
$this->db->query( $sql, __METHOD__ );
}
}
/**
* (MySQL only) Adds back fulltext index after populating the table.
*/
private function createMysqlTextIndex() {
$searchindex = $this->db->tableName( 'searchindex' );
$this->output( "\nRebuild the index...\n" );
$sql = "ALTER TABLE $searchindex ADD FULLTEXT si_title (si_title), " .
"ADD FULLTEXT si_text (si_text)";
$this->db->query( $sql, __METHOD__ );
}
/**
* Deletes everything from search index.
*/
private function clearSearchIndex() {
$this->output( 'Clearing searchindex table...' );
$this->db->delete( 'searchindex', '*', __METHOD__ );
$this->output( "Done\n" );
}
}
$maintClass = "RebuildTextIndex";
require_once RUN_MAINTENANCE_IF_MAIN;