refreshLinks.php

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

class RefreshLinks extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = "Refresh link tables";
        $this->addOption( 'dfn-only', 'Delete links from nonexistent articles only' );
        $this->addOption( 'new-only', 'Only affect articles with just a single edit' );
        $this->addOption( 'redirects-only', 'Only fix redirects, not all links' );
        $this->addOption( 'old-redirects-only', 'Only fix redirects with no redirect table entry' );
        $this->addOption( 'm', 'Maximum replication lag', false, true );
        $this->addOption( 'e', 'Last page id to refresh', false, true );
        $this->addArg( 'start', 'Page_id to start from, default 1', false );
        $this->setBatchSize( 100 );
    }

    public function execute() {
        $max = $this->getOption( 'm', 0 );
        if ( !$this->hasOption( 'dfn-only' ) ) {
            $start = $this->getArg( 0, 1 );
            $new = $this->getOption( 'new-only', false );
            $end = $this->getOption( 'e', 0 );
            $redir = $this->getOption( 'redirects-only', false );
            $oldRedir = $this->getOption( 'old-redirects-only', false );
            $this->doRefreshLinks( $start, $new, $max, $end, $redir, $oldRedir );
        }
        $this->deleteLinksFromNonexistent( $max, $this->mBatchSize );
    }

    private function doRefreshLinks( $start, $newOnly = false, $maxLag = false,
                        $end = 0, $redirectsOnly = false, $oldRedirectsOnly = false ) {
        global $wgParser, $wgUseTidy;

        $reportingInterval = 100;
        $dbr = wfGetDB( DB_SLAVE );
        $start = intval( $start );

        // Give extensions a chance to optimize settings
        wfRunHooks( 'MaintenanceRefreshLinksInit', array( $this ) );

        # Don't generate extension images (e.g. Timeline)
        $wgParser->clearTagHooks();

        # Don't use HTML tidy
        $wgUseTidy = false;

        $what = $redirectsOnly ? "redirects" : "links";

        if ( $oldRedirectsOnly ) {
            # This entire code path is cut-and-pasted from below.  Hurrah.

            $conds = array(
                "page_is_redirect=1",
                "rd_from IS NULL"
            );

            if ( $end == 0 ) {
                $conds[] = "page_id >= $start";
            } else {
                $conds[] = "page_id BETWEEN $start AND $end";
            }

            $res = $dbr->select(
                array( 'page', 'redirect' ),
                'page_id',
                $conds,
                __METHOD__,
                array(),
                array( 'redirect' => array( "LEFT JOIN", "page_id=rd_from" ) )
            );
            $num = $res->numRows();
            $this->output( "Refreshing $num old redirects from $start...\n" );

            $i = 0;

            foreach ( $res as $row ) {
                if ( !( ++$i % $reportingInterval ) ) {
                    $this->output( "$i\n" );
                    wfWaitForSlaves();
                }
                $this->fixRedirect( $row->page_id );
            }
        } elseif ( $newOnly ) {
            $this->output( "Refreshing $what from " );
            $res = $dbr->select( 'page',
                array( 'page_id' ),
                array(
                    'page_is_new' => 1,
                    "page_id >= $start" ),
                __METHOD__
            );
            $num = $res->numRows();
            $this->output( "$num new articles...\n" );

            $i = 0;
            foreach ( $res as $row ) {
                if ( !( ++$i % $reportingInterval ) ) {
                    $this->output( "$i\n" );
                    wfWaitForSlaves();
                }
                if ( $redirectsOnly ) {
                    $this->fixRedirect( $row->page_id );
                } else {
                    self::fixLinksFromArticle( $row->page_id );
                }
            }
        } else {
            if ( !$end ) {
                $maxPage = $dbr->selectField( 'page', 'max(page_id)', false );
                $maxRD = $dbr->selectField( 'redirect', 'max(rd_from)', false );
                $end = max( $maxPage, $maxRD );
            }
            $this->output( "Refreshing redirects table.\n" );
            $this->output( "Starting from page_id $start of $end.\n" );

            for ( $id = $start; $id <= $end; $id++ ) {

                if ( !( $id % $reportingInterval ) ) {
                    $this->output( "$id\n" );
                    wfWaitForSlaves();
                }
                $this->fixRedirect( $id );
            }

            if ( !$redirectsOnly ) {
                $this->output( "Refreshing links tables.\n" );
                $this->output( "Starting from page_id $start of $end.\n" );

                for ( $id = $start; $id <= $end; $id++ ) {

                    if ( !( $id % $reportingInterval ) ) {
                        $this->output( "$id\n" );
                        wfWaitForSlaves();
                    }
                    self::fixLinksFromArticle( $id );
                }
            }
        }
    }

    private function fixRedirect( $id ) {
        $page = WikiPage::newFromID( $id );
        $dbw = wfGetDB( DB_MASTER );

        if ( $page === null ) {
            // This page doesn't exist (any more)
            // Delete any redirect table entry for it
            $dbw->delete( 'redirect', array( 'rd_from' => $id ),
                __METHOD__ );
            return;
        }

        $rt = null;
        $content = $page->getContent( Revision::RAW );
        if ( $content !== null ) {
            $rt = $content->getUltimateRedirectTarget();
        }

        if ( $rt === null ) {
            // The page is not a redirect
            // Delete any redirect table entry for it
            $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
            $fieldValue = 0;
        } else {
            $page->insertRedirectEntry( $rt );
            $fieldValue = 1;
        }

        // Update the page table to be sure it is an a consistent state
        $dbw->update( 'page', array( 'page_is_redirect' => $fieldValue ),
            array( 'page_id' => $id ), __METHOD__ );
    }

    public static function fixLinksFromArticle( $id ) {
        $page = WikiPage::newFromID( $id );

        LinkCache::singleton()->clear();

        if ( $page === null ) {
            return;
        }

        $content = $page->getContent( Revision::RAW );
        if ( $content === null ) {
            return;
        }

        $dbw = wfGetDB( DB_MASTER );
        $dbw->begin( __METHOD__ );

        $updates = $content->getSecondaryDataUpdates( $page->getTitle() );
        DataUpdate::runUpdates( $updates );

        $dbw->commit( __METHOD__ );
    }

    private function deleteLinksFromNonexistent( $maxLag = 0, $batchSize = 100 ) {
        wfWaitForSlaves();

        $dbw = wfGetDB( DB_MASTER );

        $lb = wfGetLBFactory()->newMainLB();
        $dbr = $lb->getConnection( DB_SLAVE );
        $dbr->bufferResults( false );

        $linksTables = array( // table name => page_id field
            'pagelinks' => 'pl_from',
            'imagelinks' => 'il_from',
            'categorylinks' => 'cl_from',
            'templatelinks' => 'tl_from',
            'externallinks' => 'el_from',
            'iwlinks' => 'iwl_from',
            'langlinks' => 'll_from',
            'redirect' => 'rd_from',
            'page_props' => 'pp_page',
        );

        foreach ( $linksTables as $table => $field ) {
            $this->output( "Retrieving illegal entries from $table... " );

            // SELECT DISTINCT( $field ) FROM $table LEFT JOIN page ON $field=page_id WHERE page_id IS NULL;
            $results = $dbr->select(
                array( $table, 'page' ),
                $field,
                array( 'page_id' => null ),
                __METHOD__,
                'DISTINCT',
                array( 'page' => array( 'LEFT JOIN', "$field=page_id" ) )
            );

            $counter = 0;
            $list = array();
            $this->output( "0.." );
            foreach ( $results as $row ) {
                $counter++;
                $list[] = $row->$field;
                if ( ( $counter % $batchSize ) == 0 ) {
                    wfWaitForSlaves();
                    $dbw->delete( $table, array( $field => $list ), __METHOD__ );

                    $this->output( $counter . ".." );
                    $list = array();
                }
            }
            $this->output( $counter );
            if ( count( $list ) > 0 ) {
                $dbw->delete( $table, array( $field => $list ), __METHOD__ );
            }
            $this->output( "\n" );
            wfWaitForSlaves();
        }
        $lb->closeAll();
    }
}

$maintClass = 'RefreshLinks';
require_once RUN_MAINTENANCE_IF_MAIN;