385 lines
12 KiB
PHP
385 lines
12 KiB
PHP
<?php
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/**
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* Refresh link tables.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Maintenance
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*/
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require_once __DIR__ . '/Maintenance.php';
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/**
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* Maintenance script to refresh link tables.
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*
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* @ingroup Maintenance
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*/
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class RefreshLinks extends Maintenance {
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public function __construct() {
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parent::__construct();
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$this->mDescription = "Refresh link tables";
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$this->addOption( 'dfn-only', 'Delete links from nonexistent articles only' );
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$this->addOption( 'new-only', 'Only affect articles with just a single edit' );
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$this->addOption( 'redirects-only', 'Only fix redirects, not all links' );
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$this->addOption( 'old-redirects-only', 'Only fix redirects with no redirect table entry' );
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$this->addOption( 'e', 'Last page id to refresh', false, true );
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$this->addOption( 'dfn-chunk-size', 'Maximum number of existent IDs to check per ' .
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'query, default 100000', false, true );
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$this->addArg( 'start', 'Page_id to start from, default 1', false );
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$this->setBatchSize( 100 );
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}
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public function execute() {
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// Note that there is a difference between not specifying the start
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// and end IDs and using the minimum and maximum values from the page
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// table. In the latter case, deleteLinksFromNonexistent() will not
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// delete entries for nonexistent IDs that fall outside the range.
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$start = (int)$this->getArg( 0 ) ?: null;
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$end = (int)$this->getOption( 'e' ) ?: null;
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$dfnChunkSize = (int)$this->getOption( 'dfn-chunk-size', 100000 );
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if ( !$this->hasOption( 'dfn-only' ) ) {
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$new = $this->getOption( 'new-only', false );
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$redir = $this->getOption( 'redirects-only', false );
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$oldRedir = $this->getOption( 'old-redirects-only', false );
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$this->doRefreshLinks( $start, $new, $end, $redir, $oldRedir );
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$this->deleteLinksFromNonexistent( null, null, $this->mBatchSize, $dfnChunkSize );
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} else {
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$this->deleteLinksFromNonexistent( $start, $end, $this->mBatchSize, $dfnChunkSize );
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}
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}
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/**
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* Do the actual link refreshing.
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* @param int|null $start Page_id to start from
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* @param bool $newOnly Only do pages with 1 edit
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* @param int|null $end Page_id to stop at
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* @param bool $redirectsOnly Only fix redirects
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* @param bool $oldRedirectsOnly Only fix redirects without redirect entries
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*/
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private function doRefreshLinks( $start, $newOnly = false,
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$end = null, $redirectsOnly = false, $oldRedirectsOnly = false
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) {
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global $wgParser, $wgUseTidy;
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$reportingInterval = 100;
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$dbr = wfGetDB( DB_SLAVE );
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if ( $start === null ) {
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$start = 1;
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}
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// Give extensions a chance to optimize settings
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Hooks::run( 'MaintenanceRefreshLinksInit', array( $this ) );
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# Don't generate extension images (e.g. Timeline)
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$wgParser->clearTagHooks();
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# Don't use HTML tidy
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$wgUseTidy = false;
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$what = $redirectsOnly ? "redirects" : "links";
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if ( $oldRedirectsOnly ) {
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# This entire code path is cut-and-pasted from below. Hurrah.
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$conds = array(
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"page_is_redirect=1",
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"rd_from IS NULL",
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self::intervalCond( $dbr, 'page_id', $start, $end ),
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);
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$res = $dbr->select(
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array( 'page', 'redirect' ),
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'page_id',
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$conds,
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__METHOD__,
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array(),
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array( 'redirect' => array( "LEFT JOIN", "page_id=rd_from" ) )
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);
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$num = $res->numRows();
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$this->output( "Refreshing $num old redirects from $start...\n" );
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$i = 0;
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foreach ( $res as $row ) {
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if ( !( ++$i % $reportingInterval ) ) {
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$this->output( "$i\n" );
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wfWaitForSlaves();
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}
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$this->fixRedirect( $row->page_id );
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}
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} elseif ( $newOnly ) {
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$this->output( "Refreshing $what from " );
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$res = $dbr->select( 'page',
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array( 'page_id' ),
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array(
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'page_is_new' => 1,
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self::intervalCond( $dbr, 'page_id', $start, $end ),
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),
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__METHOD__
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);
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$num = $res->numRows();
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$this->output( "$num new articles...\n" );
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$i = 0;
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foreach ( $res as $row ) {
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if ( !( ++$i % $reportingInterval ) ) {
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$this->output( "$i\n" );
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wfWaitForSlaves();
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}
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if ( $redirectsOnly ) {
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$this->fixRedirect( $row->page_id );
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} else {
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self::fixLinksFromArticle( $row->page_id );
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}
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}
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} else {
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if ( !$end ) {
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$maxPage = $dbr->selectField( 'page', 'max(page_id)', false );
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$maxRD = $dbr->selectField( 'redirect', 'max(rd_from)', false );
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$end = max( $maxPage, $maxRD );
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}
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$this->output( "Refreshing redirects table.\n" );
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$this->output( "Starting from page_id $start of $end.\n" );
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for ( $id = $start; $id <= $end; $id++ ) {
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if ( !( $id % $reportingInterval ) ) {
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$this->output( "$id\n" );
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wfWaitForSlaves();
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}
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$this->fixRedirect( $id );
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}
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if ( !$redirectsOnly ) {
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$this->output( "Refreshing links tables.\n" );
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$this->output( "Starting from page_id $start of $end.\n" );
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for ( $id = $start; $id <= $end; $id++ ) {
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if ( !( $id % $reportingInterval ) ) {
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$this->output( "$id\n" );
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wfWaitForSlaves();
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}
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self::fixLinksFromArticle( $id );
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}
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}
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}
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}
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/**
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* Update the redirect entry for a given page.
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*
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* This methods bypasses the "redirect" table to get the redirect target,
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* and parses the page's content to fetch it. This allows to be sure that
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* the redirect target is up to date and valid.
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* This is particularly useful when modifying namespaces to be sure the
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* entry in the "redirect" table points to the correct page and not to an
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* invalid one.
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*
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* @param int $id The page ID to check
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*/
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private function fixRedirect( $id ) {
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$page = WikiPage::newFromID( $id );
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$dbw = wfGetDB( DB_MASTER );
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if ( $page === null ) {
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// This page doesn't exist (any more)
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// Delete any redirect table entry for it
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$dbw->delete( 'redirect', array( 'rd_from' => $id ),
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__METHOD__ );
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return;
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}
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$rt = null;
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$content = $page->getContent( Revision::RAW );
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if ( $content !== null ) {
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$rt = $content->getUltimateRedirectTarget();
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}
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if ( $rt === null ) {
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// The page is not a redirect
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// Delete any redirect table entry for it
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$dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
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$fieldValue = 0;
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} else {
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$page->insertRedirectEntry( $rt );
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$fieldValue = 1;
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}
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// Update the page table to be sure it is an a consistent state
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$dbw->update( 'page', array( 'page_is_redirect' => $fieldValue ),
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array( 'page_id' => $id ), __METHOD__ );
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}
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/**
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* Run LinksUpdate for all links on a given page_id
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* @param int $id The page_id
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*/
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public static function fixLinksFromArticle( $id ) {
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$page = WikiPage::newFromID( $id );
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LinkCache::singleton()->clear();
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if ( $page === null ) {
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return;
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}
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$content = $page->getContent( Revision::RAW );
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if ( $content === null ) {
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return;
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}
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$dbw = wfGetDB( DB_MASTER );
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$dbw->begin( __METHOD__ );
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$updates = $content->getSecondaryDataUpdates( $page->getTitle() );
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DataUpdate::runUpdates( $updates );
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$dbw->commit( __METHOD__ );
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}
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/**
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* Removes non-existing links from pages from pagelinks, imagelinks,
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* categorylinks, templatelinks, externallinks, interwikilinks, langlinks and redirect tables.
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*
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* @param int|null $start Page_id to start from
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* @param int|null $end Page_id to stop at
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* @param int $batchSize The size of deletion batches
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* @param int $chunkSize Maximum number of existent IDs to check per query
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*
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* @author Merlijn van Deen <valhallasw@arctus.nl>
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*/
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private function deleteLinksFromNonexistent( $start = null, $end = null, $batchSize = 100,
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$chunkSize = 100000
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) {
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wfWaitForSlaves();
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$this->output( "Deleting illegal entries from the links tables...\n" );
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$dbr = wfGetDB( DB_SLAVE );
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do {
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// Find the start of the next chunk. This is based only
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// on existent page_ids.
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$nextStart = $dbr->selectField(
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'page',
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'page_id',
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self::intervalCond( $dbr, 'page_id', $start, $end ),
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__METHOD__,
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array( 'ORDER BY' => 'page_id', 'OFFSET' => $chunkSize )
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);
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if ( $nextStart !== false ) {
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// To find the end of the current chunk, subtract one.
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// This will serve to limit the number of rows scanned in
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// dfnCheckInterval(), per query, to at most the sum of
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// the chunk size and deletion batch size.
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$chunkEnd = $nextStart - 1;
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} else {
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// This is the last chunk. Check all page_ids up to $end.
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$chunkEnd = $end;
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}
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$fmtStart = $start !== null ? "[$start" : '(-INF';
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$fmtChunkEnd = $chunkEnd !== null ? "$chunkEnd]" : 'INF)';
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$this->output( " Checking interval $fmtStart, $fmtChunkEnd\n" );
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$this->dfnCheckInterval( $start, $chunkEnd, $batchSize );
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$start = $nextStart;
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} while ( $nextStart !== false );
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}
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/**
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* @see RefreshLinks::deleteLinksFromNonexistent()
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* @param int|null $start Page_id to start from
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* @param int|null $end Page_id to stop at
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* @param int $batchSize The size of deletion batches
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*/
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private function dfnCheckInterval( $start = null, $end = null, $batchSize = 100 ) {
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$dbw = wfGetDB( DB_MASTER );
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$dbr = wfGetDB( DB_SLAVE );
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$linksTables = array( // table name => page_id field
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'pagelinks' => 'pl_from',
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'imagelinks' => 'il_from',
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'categorylinks' => 'cl_from',
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'templatelinks' => 'tl_from',
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'externallinks' => 'el_from',
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'iwlinks' => 'iwl_from',
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'langlinks' => 'll_from',
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'redirect' => 'rd_from',
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'page_props' => 'pp_page',
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);
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foreach ( $linksTables as $table => $field ) {
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$this->output( " $table: 0" );
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$counter = 0;
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do {
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$ids = $dbr->selectFieldValues(
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$table,
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$field,
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array(
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self::intervalCond( $dbr, $field, $start, $end ),
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"$field NOT IN ({$dbr->selectSQLText( 'page', 'page_id' )})",
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),
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__METHOD__,
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array( 'DISTINCT', 'ORDER BY' => $field, 'LIMIT' => $batchSize )
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);
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$numIds = count( $ids );
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if ( $numIds ) {
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$counter += $numIds;
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wfWaitForSlaves();
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$dbw->delete( $table, array( $field => $ids ), __METHOD__ );
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$this->output( ", $counter" );
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$start = $ids[$numIds - 1] + 1;
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}
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} while ( $numIds >= $batchSize && ( $end === null || $start <= $end ) );
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$this->output( " deleted.\n" );
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wfWaitForSlaves();
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}
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}
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/**
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* Build a SQL expression for a closed interval (i.e. BETWEEN).
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*
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* By specifying a null $start or $end, it is also possible to create
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* half-bounded or unbounded intervals using this function.
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*
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* @param IDatabase $db Database connection
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* @param string $var Field name
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* @param mixed $start First value to include or null
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* @param mixed $end Last value to include or null
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*/
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private static function intervalCond( IDatabase $db, $var, $start, $end ) {
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if ( $start === null && $end === null ) {
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return "$var IS NOT NULL";
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} elseif ( $end === null ) {
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return "$var >= {$db->addQuotes( $start )}";
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} elseif ( $start === null ) {
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return "$var <= {$db->addQuotes( $end )}";
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} else {
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return "$var BETWEEN {$db->addQuotes( $start )} AND {$db->addQuotes( $end )}";
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}
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}
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}
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$maintClass = 'RefreshLinks';
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require_once RUN_MAINTENANCE_IF_MAIN;
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