resolveStubs.php

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<?php
define( 'REPORTING_INTERVAL', 100 );

if ( !defined( 'MEDIAWIKI' ) ) {
        $optionsWithArgs = array( 'm' );

        require_once( dirname( __FILE__ ) . '/../commandLine.inc' );

        resolveStubs();
}

function resolveStubs() {
        $fname = 'resolveStubs';

        $dbr = wfGetDB( DB_SLAVE );
        $maxID = $dbr->selectField( 'text', 'MAX(old_id)', false, $fname );
        $blockSize = 10000;
        $numBlocks = intval( $maxID / $blockSize ) + 1;

        for ( $b = 0; $b < $numBlocks; $b++ ) {
                wfWaitForSlaves();

                printf( "%5.2f%%\n", $b / $numBlocks * 100 );
                $start = intval( $maxID / $numBlocks ) * $b + 1;
                $end = intval( $maxID / $numBlocks ) * ( $b + 1 );

                $res = $dbr->select( 'text', array( 'old_id', 'old_text', 'old_flags' ),
                        "old_id>=$start AND old_id<=$end " .
                        "AND old_flags LIKE '%object%' AND old_flags NOT LIKE '%external%' " .
                        'AND LOWER(CONVERT(LEFT(old_text,22) USING latin1)) = \'o:15:"historyblobstub"\'',
                        $fname );
                foreach ( $res as $row ) {
                        resolveStub( $row->old_id, $row->old_text, $row->old_flags );
                }
        }
        print "100%\n";
}

function resolveStub( $id, $stubText, $flags ) {
        $fname = 'resolveStub';

        $stub = unserialize( $stubText );
        $flags = explode( ',', $flags );

        $dbr = wfGetDB( DB_SLAVE );
        $dbw = wfGetDB( DB_MASTER );

        if ( strtolower( get_class( $stub ) ) !== 'historyblobstub' ) {
                print "Error found object of class " . get_class( $stub ) . ", expecting historyblobstub\n";
                return;
        }

        # Get the (maybe) external row
        $externalRow = $dbr->selectRow( 'text', array( 'old_text' ),
                array( 'old_id' => $stub->mOldId, 'old_flags' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ) ),
                $fname
        );

        if ( !$externalRow ) {
                # Object wasn't external
                return;
        }

        # Preserve the legacy encoding flag, but switch from object to external
        if ( in_array( 'utf-8', $flags ) ) {
                $newFlags = 'external,utf-8';
        } else {
                $newFlags = 'external';
        }

        # Update the row
        # print "oldid=$id\n";
        $dbw->update( 'text',
                array( /* SET */
                        'old_flags' => $newFlags,
                        'old_text' => $externalRow->old_text . '/' . $stub->mHash
                ),
                array( /* WHERE */
                        'old_id' => $id
                ), $fname
        );
}