migrateUserGroup.php

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

class MigrateUserGroup extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = "Re-assign users from an old group to a new one";
        $this->addArg( 'oldgroup', 'Old user group key', true );
        $this->addArg( 'newgroup', 'New user group key', true );
        $this->setBatchSize( 200 );
    }

    public function execute() {
        $count = 0;
        $oldGroup = $this->getArg( 0 );
        $newGroup = $this->getArg( 1 );
        $dbw = wfGetDB( DB_MASTER );
        $start = $dbw->selectField( 'user_groups', 'MIN(ug_user)',
            array( 'ug_group' => $oldGroup ), __FUNCTION__ );
        $end = $dbw->selectField( 'user_groups', 'MAX(ug_user)',
            array( 'ug_group' => $oldGroup ), __FUNCTION__ );
        if ( $start === null ) {
            $this->error( "Nothing to do - no users in the '$oldGroup' group", true );
        }
        # Do remaining chunk
        $end += $this->mBatchSize - 1;
        $blockStart = $start;
        $blockEnd = $start + $this->mBatchSize - 1;
        // Migrate users over in batches...
        while ( $blockEnd <= $end ) {
            $affected = 0;
            $this->output( "Doing users $blockStart to $blockEnd\n" );

            $dbw->begin( __METHOD__ );
            $dbw->update( 'user_groups',
                array( 'ug_group' => $newGroup ),
                array( 'ug_group' => $oldGroup,
                    "ug_user BETWEEN $blockStart AND $blockEnd" ),
                __METHOD__,
                array( 'IGNORE' )
            );
            $affected += $dbw->affectedRows();
            // Delete rows that the UPDATE operation above had to ignore.
            // This happens when a user is in both the old and new group.
            // Updating the row for the old group membership failed since
            // user/group is UNIQUE.
            $dbw->delete( 'user_groups',
                array( 'ug_group' => $oldGroup,
                    "ug_user BETWEEN $blockStart AND $blockEnd" ),
                __METHOD__
            );
            $affected += $dbw->affectedRows();
            $dbw->commit( __METHOD__ );

            // Clear cache for the affected users (bug 40340)
            if ( $affected > 0 ) {
                // XXX: This also invalidates cache of unaffected users that
                // were in the new group and not in the group.
                $res = $dbw->select( 'user_groups', 'ug_user',
                    array( 'ug_group' => $newGroup,
                        "ug_user BETWEEN $blockStart AND $blockEnd" ),
                    __METHOD__
                );
                if ( $res !== false ) {
                    foreach ( $res as $row ) {
                        $user = User::newFromId( $row->ug_user );
                        $user->invalidateCache();
                    }
                }
            }

            $count += $affected;
            $blockStart += $this->mBatchSize;
            $blockEnd += $this->mBatchSize;
            wfWaitForSlaves();
        }
        $this->output( "Done! $count users in group '$oldGroup' are now in '$newGroup' instead.\n" );
    }
}

$maintClass = "MigrateUserGroup";
require_once RUN_MAINTENANCE_IF_MAIN;