rebuildtextindex.php

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<?php
require_once( dirname( __FILE__ ) . '/Maintenance.php' );

class RebuildTextIndex extends Maintenance {
        const RTI_CHUNK_SIZE = 500;

        private $db;

        public function __construct() {
                parent::__construct();
                $this->mDescription = "Rebuild search index table from scratch";
        }

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

        public function execute() {
                global $wgTitle;

                // Shouldn't be needed for Postgres
                $this->db = wfGetDB( DB_MASTER );
                if ( $this->db->getType() == 'postgres' ) {
                        $this->error( "This script is not needed when using Postgres.\n", true );
                }

                $this->db = wfGetDB( DB_MASTER );
                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 );
                        }
                }

                $wgTitle = Title::newFromText( "Rebuild text index script" );

                if ( $this->db->getType() == 'mysql' ) {
                        $this->dropMysqlTextIndex();
                        $this->populateSearchIndex();
                        $this->createMysqlTextIndex();
                } else {
                        $this->clearSearchIndex();
                        $this->populateSearchIndex();
                }

                $this->output( "Done.\n" );
        }

        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;

                while ( $n < $count ) {
                        if ( $n ) {
                                $this->output( $n . "\n" );
                        }
                        $end = $n + self::RTI_CHUNK_SIZE - 1;

                        $res = $this->db->select( array( 'page', 'revision', 'text' ),
                                array( 'page_id', 'page_namespace', 'page_title', 'old_flags', 'old_text' ),
                                array( "page_id BETWEEN $n AND $end", 'page_latest = rev_id', 'rev_text_id = old_id' ),
                                __METHOD__
                                );

                        foreach ( $res as $s ) {
                                $revtext = Revision::getRevisionText( $s );
                                $u = new SearchUpdate( $s->page_id, $s->page_title, $revtext );
                                $u->doUpdate();
                        }
                        $n += self::RTI_CHUNK_SIZE;
                }
        }

        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__ );
                }
        }

        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__ );
        }

        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 );