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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
use MediaWiki\Deferred\DeferredUpdates;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\Maintenance\Maintenance;
use MediaWiki\MediaWikiServices;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Title\Title;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\IReadableDatabase;
use Wikimedia\Rdbms\SelectQueryBuilder;
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
/**
* Refresh link tables.
*
* @ingroup Maintenance
*/
class RefreshLinks extends Maintenance {
private const REPORTING_INTERVAL = 100;
public function __construct() {
parent::__construct();
$this->addDescription( 'Refresh link tables' );
$this->addOption( 'verbose', 'Output information about link refresh progress', false, false, 'v' );
$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( 'touched-only', 'Only fix pages that have been touched after last update' );
$this->addOption( 'e', 'Last page id to refresh', false, true );
$this->addOption( 'dfn-chunk-size', 'Maximum number of existent IDs to check per ' .
'query, default 100,000', false, true );
$this->addOption( 'namespace', 'Only fix pages in this namespace', false, true );
$this->addOption( 'category', 'Only fix pages in this category', false, true );
$this->addOption( 'tracking-category', 'Only fix pages in this tracking category', false, true );
$this->addOption( 'before-timestamp', 'Only fix pages that were last updated before this timestamp',
false, true );
$this->addArg( 'start', 'Page_id to start from, default 1', false );
$this->setBatchSize( 100 );
}
public function execute() {
// Note that there is a difference between not specifying the start
// and end IDs and using the minimum and maximum values from the page
// table. In the latter case, deleteLinksFromNonexistent() will not
// delete entries for nonexistent IDs that fall outside the range.
$start = (int)$this->getArg( 0 ) ?: null;
$end = (int)$this->getOption( 'e' ) ?: null;
$dfnChunkSize = (int)$this->getOption( 'dfn-chunk-size', 100_000 );
if ( $this->hasOption( 'dfn-only' ) ) {
$this->deleteLinksFromNonexistent( $start, $end, $this->getBatchSize(), $dfnChunkSize );
return;
}
$dbr = $this->getDB( DB_REPLICA, [ 'vslow' ] );
$builder = $dbr->newSelectQueryBuilder()
->from( 'page' )
->where( self::intervalCond( $dbr, 'page_id', $start, $end ) )
->limit( $this->getBatchSize() );
if ( $this->hasOption( 'namespace' ) ) {
$builder->andWhere( [ 'page_namespace' => (int)$this->getOption( 'namespace' ) ] );
}
if ( $this->hasOption( 'before-timestamp' ) ) {
$builder->andWhere(
$dbr->expr( 'page_links_updated', '<', $this->getOption( 'before-timestamp' ) )
->or( 'page_links_updated', '=', null )
);
}
if ( $this->hasOption( 'category' ) ) {
$category = $this->getOption( 'category' );
$title = Title::makeTitleSafe( NS_CATEGORY, $category );
if ( !$title ) {
$this->fatalError( "'$category' is an invalid category name!\n" );
}
$this->refreshCategory( $builder, $title );
} elseif ( $this->hasOption( 'tracking-category' ) ) {
// See TrackingCategories::CORE_TRACKING_CATEGORIES for tracking category keys defined by core
$this->refreshTrackingCategory( $builder, $this->getOption( 'tracking-category' ) );
} else {
$new = $this->hasOption( 'new-only' );
$redir = $this->hasOption( 'redirects-only' );
$touched = $this->hasOption( 'touched-only' );
$what = $redir ? 'redirects' : 'links';
if ( $new ) {
$builder->andWhere( [ 'page_is_new' => 1 ] );
$this->output( "Refreshing $what from new pages...\n" );
} else {
if ( $touched ) {
$builder->andWhere( [
$dbr->expr( 'page_touched', '>', 'page_links_updated' )
->or( 'page_links_updated', '=', null ),
] );
}
$this->output( "Refreshing $what from pages...\n" );
}
$this->doRefreshLinks( $builder, $redir );
if ( !$this->hasOption( 'namespace' ) ) {
$this->deleteLinksFromNonexistent( $start, $end, $this->getBatchSize(), $dfnChunkSize );
}
}
}
/**
* Do the actual link refreshing.
* @param SelectQueryBuilder $builder
* @param bool $redirectsOnly Only fix redirects
* @param array $indexFields
*/
private function doRefreshLinks(
SelectQueryBuilder $builder,
bool $redirectsOnly = false,
array $indexFields = [ 'page_id' ]
) {
// Give extensions a chance to optimize settings
$this->getHookRunner()->onMaintenanceRefreshLinksInit( $this );
$estimateCount = $builder->caller( __METHOD__ )->estimateRowCount();
$this->output( "Estimated page count: $estimateCount\n" );
$i = 0;
$lastIndexes = array_fill_keys( $indexFields, 0 );
$selectFields = in_array( 'page_id', $indexFields )
? $indexFields : [ 'page_id', ...$indexFields ];
$verbose = $this->hasOption( 'verbose' );
$dbr = $this->getDB( DB_REPLICA, [ 'vslow' ] );
do {
$batchCond = $dbr->buildComparison( '>', $lastIndexes );
$res = ( clone $builder )->select( $selectFields )
->andWhere( [ $batchCond ] )
->orderBy( $indexFields )
->caller( __METHOD__ )->fetchResultSet();
if ( $verbose ) {
$this->output( "Refreshing links for {$res->numRows()} pages\n" );
}
foreach ( $res as $row ) {
if ( !( ++$i % self::REPORTING_INTERVAL ) ) {
$this->output( "$i\n" );
$this->waitForReplication();
}
if ( $verbose ) {
$this->output( "Refreshing links for page ID {$row->page_id}\n" );
}
self::fixRedirect( $this, $row->page_id );
if ( !$redirectsOnly ) {
self::fixLinksFromArticle( $row->page_id );
}
}
if ( $res->numRows() ) {
$res->seek( $res->numRows() - 1 );
foreach ( $indexFields as $field ) {
$lastIndexes[$field] = $res->current()->$field;
}
}
} while ( $res->numRows() == $this->getBatchSize() );
}
/**
* Update the redirect entry for a given page.
*
* This methods bypasses the "redirect" table to get the redirect target,
* and parses the page's content to fetch it. This allows to be sure that
* the redirect target is up to date and valid.
* This is particularly useful when modifying namespaces to be sure the
* entry in the "redirect" table points to the correct page and not to an
* invalid one.
*
* @internal
* @param Maintenance $maint
* @param int $id The page ID to check
*/
public static function fixRedirect( Maintenance $maint, $id ) {
$page = $maint->getServiceContainer()->getWikiPageFactory()->newFromID( $id );
// In case the page just got deleted.
if ( $page === null ) {
return;
}
$rt = null;
$content = $page->getContent( RevisionRecord::RAW );
if ( $content !== null ) {
$rt = $content->getRedirectTarget();
}
$dbw = $maint->getDB( DB_PRIMARY );
if ( $rt === null ) {
// The page is not a redirect
// Delete any redirect table entry for it
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'redirect' )
->where( [ 'rd_from' => $id ] )
->caller( __METHOD__ )->execute();
$fieldValue = 0;
} else {
$page->insertRedirectEntry( $rt );
$fieldValue = 1;
}
// Update the page table to be sure it is an a consistent state
$dbw->newUpdateQueryBuilder()
->update( 'page' )
->set( [ 'page_is_redirect' => $fieldValue ] )
->where( [ 'page_id' => $id ] )
->caller( __METHOD__ )
->execute();
}
/**
* Run LinksUpdate for all links on a given page_id
* @param int $id The page_id
*/
public static function fixLinksFromArticle( $id ) {
$services = MediaWikiServices::getInstance();
$page = $services->getWikiPageFactory()->newFromID( $id );
// In case the page just got deleted.
if ( $page === null ) {
return;
}
// Defer updates to post-send but then immediately execute deferred updates;
// this is the simplest way to run all updates immediately (including updates
// scheduled by other updates).
$page->doSecondaryDataUpdates( [
'defer' => DeferredUpdates::POSTSEND,
'causeAction' => 'refresh-links-maintenance',
'recursive' => false,
] );
DeferredUpdates::doUpdates();
}
/**
* Removes non-existing links from pages from pagelinks, imagelinks,
* categorylinks, templatelinks, externallinks, interwikilinks, langlinks and redirect tables.
*
* @param int|null $start Page_id to start from
* @param int|null $end Page_id to stop at
* @param int $batchSize The size of deletion batches
* @param int $chunkSize Maximum number of existent IDs to check per query
*
* @author Merlijn van Deen <valhallasw@arctus.nl>
*/
private function deleteLinksFromNonexistent( $start = null, $end = null, $batchSize = 100,
$chunkSize = 100_000
) {
$this->waitForReplication();
$this->output( "Deleting illegal entries from the links tables...\n" );
$dbr = $this->getDB( DB_REPLICA, [ 'vslow' ] );
do {
// Find the start of the next chunk. This is based only
// on existent page_ids.
$nextStart = $dbr->newSelectQueryBuilder()
->select( 'page_id' )
->from( 'page' )
->where( [ self::intervalCond( $dbr, 'page_id', $start, $end ) ] )
->orderBy( 'page_id' )
->offset( $chunkSize )
->caller( __METHOD__ )->fetchField();
if ( $nextStart !== false ) {
// To find the end of the current chunk, subtract one.
// This will serve to limit the number of rows scanned in
// dfnCheckInterval(), per query, to at most the sum of
// the chunk size and deletion batch size.
$chunkEnd = $nextStart - 1;
} else {
// This is the last chunk. Check all page_ids up to $end.
$chunkEnd = $end;
}
$fmtStart = $start !== null ? "[$start" : '(-INF';
$fmtChunkEnd = $chunkEnd !== null ? "$chunkEnd]" : 'INF)';
$this->output( " Checking interval $fmtStart, $fmtChunkEnd\n" );
$this->dfnCheckInterval( $start, $chunkEnd, $batchSize );
$start = $nextStart;
} while ( $nextStart !== false );
}
/**
* @see RefreshLinks::deleteLinksFromNonexistent()
* @param int|null $start Page_id to start from
* @param int|null $end Page_id to stop at
* @param int $batchSize The size of deletion batches
*/
private function dfnCheckInterval( $start = null, $end = null, $batchSize = 100 ) {
$dbw = $this->getPrimaryDB();
$dbr = $this->getDB( DB_REPLICA, [ 'vslow' ] );
$linksTables = [
// 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( " $table: 0" );
$tableStart = $start;
$counter = 0;
do {
$ids = $dbr->newSelectQueryBuilder()
->select( $field )
->distinct()
->from( $table )
->leftJoin( 'page', null, "$field = page_id" )
->where( self::intervalCond( $dbr, $field, $tableStart, $end ) )
->andWhere( [ 'page_id' => null ] )
->orderBy( $field )
->limit( $batchSize )
->caller( __METHOD__ )->fetchFieldValues();
$numIds = count( $ids );
if ( $numIds ) {
$counter += $numIds;
$dbw->newDeleteQueryBuilder()
->deleteFrom( $table )
->where( [ $field => $ids ] )
->caller( __METHOD__ )->execute();
$this->output( ", $counter" );
$tableStart = $ids[$numIds - 1] + 1;
$this->waitForReplication();
}
} while ( $numIds >= $batchSize && ( $end === null || $tableStart <= $end ) );
$this->output( " deleted.\n" );
}
}
/**
* Build a SQL expression for a closed interval.
*
* By specifying a null $start or $end, it is also possible to create
* half-bounded or unbounded intervals using this function.
*
* @param IReadableDatabase $db
* @param string $var Field name
* @param mixed $start First value to include or null
* @param mixed $end Last value to include or null
* @return IExpression
*/
private static function intervalCond( IReadableDatabase $db, $var, $start, $end ) {
if ( $start === null && $end === null ) {
return $db->expr( $var, '!=', null );
} elseif ( $end === null ) {
return $db->expr( $var, '>=', $start );
} elseif ( $start === null ) {
return $db->expr( $var, '<=', $end );
} else {
return $db->expr( $var, '>=', $start )->and( $var, '<=', $end );
}
}
/**
* Refershes links for pages in a tracking category
*
* @param SelectQueryBuilder $builder
* @param string $category Category key
*/
private function refreshTrackingCategory( SelectQueryBuilder $builder, $category ) {
$cats = $this->getPossibleCategories( $category );
if ( !$cats ) {
$this->error( "Tracking category '$category' is disabled\n" );
// Output to stderr but don't bail out.
}
foreach ( $cats as $cat ) {
$this->refreshCategory( clone $builder, $cat );
}
}
/**
* Refreshes links to a category
*
* @param SelectQueryBuilder $builder
* @param LinkTarget $category
*/
private function refreshCategory( SelectQueryBuilder $builder, LinkTarget $category ) {
$this->output( "Refreshing pages in category '{$category->getText()}'...\n" );
$builder->join( 'categorylinks', null, 'page_id=cl_from' )
->andWhere( [ 'cl_to' => $category->getDBkey() ] );
$this->doRefreshLinks( $builder, false, [ 'cl_timestamp', 'cl_from' ] );
}
/**
* Returns a list of possible categories for a given tracking category key
*
* @param string $categoryKey
* @return LinkTarget[]
*/
private function getPossibleCategories( $categoryKey ) {
$cats = $this->getServiceContainer()->getTrackingCategories()->getTrackingCategories();
if ( isset( $cats[$categoryKey] ) ) {
return $cats[$categoryKey]['cats'];
}
$this->fatalError( "Unknown tracking category {$categoryKey}\n" );
}
}
// @codeCoverageIgnoreStart
$maintClass = RefreshLinks::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd