refreshExternallinksIndex.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class RefreshExternallinksIndex extends LoggedUpdateMaintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription(
            'Refresh the externallinks table el_index and el_index_60 from el_to' );
        $this->setBatchSize( 10000 );
    }

    protected function getUpdateKey() {
        return static::class
            . ' v' . LinkFilter::VERSION
            . ( LinkFilter::supportsIDN() ? '+' : '-' ) . 'IDN';
    }

    protected function updateSkippedMessage() {
        return 'externallinks table indexes up to date';
    }

    protected function doDBUpdates() {
        $dbw = $this->getDB( DB_MASTER );
        if ( !$dbw->tableExists( 'externallinks' ) ) {
            $this->error( "externallinks table does not exist" );
            return false;
        }
        $this->output( "Updating externallinks table index fields\n" );

        $minmax = $dbw->selectRow(
            'externallinks',
            [ 'min' => 'MIN(el_id)', 'max' => 'MAX(el_id)' ],
            '',
            __METHOD__
        );

        $updated = 0;
        $deleted = 0;
        $start = $minmax->min - 1;
        $last = $minmax->max;
        while ( $start < $last ) {
            $end = min( $start + $this->mBatchSize, $last );
            $this->output( "el_id $start - $end of $last\n" );
            $res = $dbw->select( 'externallinks', [ 'el_id', 'el_to', 'el_index' ],
                [
                    "el_id > $start",
                    "el_id <= $end",
                ],
                __METHOD__,
                [ 'ORDER BY' => 'el_id' ]
            );
            foreach ( $res as $row ) {
                $newIndexes = LinkFilter::makeIndexes( $row->el_to );
                if ( !$newIndexes ) {
                    $dbw->delete( 'externallinks', [ 'el_id' => $row->el_id ], __METHOD__ );
                    $deleted++;
                    continue;
                }
                if ( in_array( $row->el_index, $newIndexes, true ) ) {
                    continue;
                }

                if ( count( $newIndexes ) === 1 ) {
                    $newIndex = $newIndexes[0];
                } else {
                    // Assume the scheme is the only difference between the different $newIndexes.
                    // Keep this row's scheme, assuming there's another row with the other scheme.
                    $newIndex = substr( $row->el_index, 0, strpos( $row->el_index, ':' ) ) .
                        substr( $newIndexes[0], strpos( $newIndexes[0], ':' ) );
                }
                $dbw->update( 'externallinks',
                    [
                        'el_index' => $newIndex,
                        'el_index_60' => substr( $newIndex, 0, 60 ),
                    ],
                    [ 'el_id' => $row->el_id ],
                    __METHOD__
                );
                $updated++;
            }
            wfWaitForSlaves();
            $start = $end;
        }
        $this->output( "Done, $updated rows updated, $deleted deleted.\n" );

        return true;
    }
}

$maintClass = "RefreshExternallinksIndex";
require_once RUN_MAINTENANCE_IF_MAIN;