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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->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 );
}
/**
* Do the actual link refreshing.
* @param $start int Page_id to start from
* @param $newOnly bool Only do pages with 1 edit
* @param $maxLag int Max DB replication lag
* @param $end int Page_id to stop at
* @param $redirectsOnly bool Only fix redirects
* @param $oldRedirectsOnly bool Only fix redirects without redirect entries
*/
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 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();
}
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 $id int The page ID to check
*/
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__ );
}
/**
* Run LinksUpdate for all links on a given page_id
* @param $id int 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;
}
$dbw = wfGetDB( DB_MASTER );
$dbw->begin( __METHOD__ );
$updates = $content->getSecondaryDataUpdates( $page->getTitle() );
DataUpdate::runUpdates( $updates );
$dbw->commit( __METHOD__ );
}
/**
* Removes non-existing links from pages from pagelinks, imagelinks,
* categorylinks, templatelinks, externallinks, interwikilinks, langlinks and redirect tables.
*
* @param $maxLag int
* @param $batchSize int The size of deletion batches
*
* @author Merlijn van Deen <valhallasw@arctus.nl>
*/
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 );