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<?php
/**
* Refresh link tables.
*
* 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
* @ingroup Maintenance
*/
require_once __DIR__ . '/Maintenance.php';
/**
* Maintenance script to refresh link tables.
*
* @ingroup Maintenance
*/
class RefreshLinks extends Maintenance {
public function __construct() {
parent::__construct();
$this->addDescription( '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( 'e', 'Last page id to refresh', false, true );
$this->addOption( 'dfn-chunk-size', 'Maximum number of existent IDs to check per ' .
'query, default 100000', 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', 100000 );
if ( !$this->hasOption( 'dfn-only' ) ) {
$new = $this->getOption( 'new-only', false );
$redir = $this->getOption( 'redirects-only', false );
$oldRedir = $this->getOption( 'old-redirects-only', false );
$this->doRefreshLinks( $start, $new, $end, $redir, $oldRedir );
$this->deleteLinksFromNonexistent( null, null, $this->mBatchSize, $dfnChunkSize );
} else {
$this->deleteLinksFromNonexistent( $start, $end, $this->mBatchSize, $dfnChunkSize );
}
}
/**
* Do the actual link refreshing.
* @param int|null $start Page_id to start from
* @param bool $newOnly Only do pages with 1 edit
* @param int|null $end Page_id to stop at
* @param bool $redirectsOnly Only fix redirects
* @param bool $oldRedirectsOnly Only fix redirects without redirect entries
*/
private function doRefreshLinks( $start, $newOnly = false,
$end = null, $redirectsOnly = false, $oldRedirectsOnly = false
) {
$reportingInterval = 100;
$dbr = $this->getDB( DB_SLAVE );
if ( $start === null ) {
$start = 1;
}
// Give extensions a chance to optimize settings
Hooks::run( 'MaintenanceRefreshLinksInit', [ $this ] );
$what = $redirectsOnly ? "redirects" : "links";
if ( $oldRedirectsOnly ) {
# This entire code path is cut-and-pasted from below. Hurrah.
$conds = [
"page_is_redirect=1",
"rd_from IS NULL",
self::intervalCond( $dbr, 'page_id', $start, $end ),
];
$res = $dbr->select(
[ 'page', 'redirect' ],
'page_id',
$conds,
__METHOD__,
[],
[ 'redirect' => [ "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',
[ 'page_id' ],
[
'page_is_new' => 1,
self::intervalCond( $dbr, 'page_id', $start, $end ),
],
__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 );
}
}
}
}
/**
* 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.
*
* @param int $id The page ID to check
*/
private function fixRedirect( $id ) {
$page = WikiPage::newFromID( $id );
$dbw = $this->getDB( DB_MASTER );
if ( $page === null ) {
// This page doesn't exist (any more)
// Delete any redirect table entry for it
$dbw->delete( 'redirect', [ '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', [ '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', [ 'page_is_redirect' => $fieldValue ],
[ 'page_id' => $id ], __METHOD__ );
}
/**
* Run LinksUpdate for all links on a given page_id
* @param int $id The page_id
*/
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;
}
$updates = $content->getSecondaryDataUpdates( $page->getTitle() );
DataUpdate::runUpdates( $updates );
}
/**
* 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 = 100000
) {
wfWaitForSlaves();
$this->output( "Deleting illegal entries from the links tables...\n" );
$dbr = $this->getDB( DB_SLAVE );
do {
// Find the start of the next chunk. This is based only
// on existent page_ids.
$nextStart = $dbr->selectField(
'page',
'page_id',
self::intervalCond( $dbr, 'page_id', $start, $end ),
__METHOD__,
[ 'ORDER BY' => 'page_id', 'OFFSET' => $chunkSize ]
);
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->getDB( DB_MASTER );
$dbr = $this->getDB( DB_SLAVE );
$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->selectFieldValues(
$table,
$field,
[
self::intervalCond( $dbr, $field, $tableStart, $end ),
"$field NOT IN ({$dbr->selectSQLText( 'page', 'page_id' )})",
],
__METHOD__,
[ 'DISTINCT', 'ORDER BY' => $field, 'LIMIT' => $batchSize ]
);
$numIds = count( $ids );
if ( $numIds ) {
$counter += $numIds;
$dbw->delete( $table, [ $field => $ids ], __METHOD__ );
$this->output( ", $counter" );
$tableStart = $ids[$numIds - 1] + 1;
wfWaitForSlaves();
}
} while ( $numIds >= $batchSize && ( $end === null || $tableStart <= $end ) );
$this->output( " deleted.\n" );
}
}
/**
* Build a SQL expression for a closed interval (i.e. BETWEEN).
*
* By specifying a null $start or $end, it is also possible to create
* half-bounded or unbounded intervals using this function.
*
* @param IDatabase $db Database connection
* @param string $var Field name
* @param mixed $start First value to include or null
* @param mixed $end Last value to include or null
*/
private static function intervalCond( IDatabase $db, $var, $start, $end ) {
if ( $start === null && $end === null ) {
return "$var IS NOT NULL";
} elseif ( $end === null ) {
return "$var >= {$db->addQuotes( $start )}";
} elseif ( $start === null ) {
return "$var <= {$db->addQuotes( $end )}";
} else {
return "$var BETWEEN {$db->addQuotes( $start )} AND {$db->addQuotes( $end )}";
}
}
}
$maintClass = 'RefreshLinks';
require_once RUN_MAINTENANCE_IF_MAIN;