335 lines
9.6 KiB
PHP
335 lines
9.6 KiB
PHP
<?php
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/**
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* See deferred.txt
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* @package MediaWiki
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*/
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/**
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* @todo document
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* @package MediaWiki
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*/
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class LinksUpdate {
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/**#@+
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* @access private
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*/
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var $mId, $mTitle;
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/**#@-*/
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/**
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* Constructor
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* Initialize private variables
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* @param integer $id
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* @param string $title
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*/
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function LinksUpdate( $id, $title ) {
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$this->mId = $id;
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$this->mTitle = $title;
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}
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/**
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* Update link tables with outgoing links from an updated article
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* Relies on the 'link cache' to be filled out.
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*/
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function doUpdate() {
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global $wgUseBetterLinksUpdate, $wgLinkCache, $wgDBtransactions;
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global $wgEnablePersistentLC, $wgUseCategoryMagic;
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$fname = 'LinksUpdate::doUpdate';
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wfProfileIn( $fname );
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$del = array();
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$add = array();
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$dbw =& wfGetDB( DB_MASTER );
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$links = $dbw->tableName( 'links' );
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$brokenlinks = $dbw->tableName( 'brokenlinks' );
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$imagelinks = $dbw->tableName( 'imagelinks' );
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$categorylinks = $dbw->tableName( 'categorylinks' );
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#------------------------------------------------------------------------------
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# Good links
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if ( $wgLinkCache->incrementalSetup( LINKCACHE_GOOD, $del, $add ) ) {
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# Delete where necessary
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if ( count( $del ) ) {
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$sql = "DELETE FROM $links WHERE l_from={$this->mId} AND l_to IN(".
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implode( ',', $del ) . ')';
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$dbw->query( $sql, $fname );
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}
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} else {
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# Delete everything
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$dbw->delete( 'links', array( 'l_from' => $this->mId ), $fname );
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# Get the addition list
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$add = $wgLinkCache->getGoodLinks();
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}
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# Do the insertion
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if ( 0 != count( $add ) ) {
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$arr=array();
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foreach($add as $lt=>$lid)
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array_push( $arr, array(
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'l_from' => $this->mId,
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'l_to' => $lid ) );
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# The link cache was constructed without FOR UPDATE, so there may be collisions
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# Ignoring for now, I'm not sure if that causes problems or not, but I'm fairly
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# sure it's better than without IGNORE
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$dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
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}
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#------------------------------------------------------------------------------
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# Bad links
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if ( $wgLinkCache->incrementalSetup( LINKCACHE_BAD, $del, $add ) ) {
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# Delete where necessary
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if ( count( $del ) ) {
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$sql = "DELETE FROM $brokenlinks WHERE bl_from={$this->mId} AND bl_to IN(";
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$first = true;
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foreach( $del as $badTitle ) {
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if ( $first ) {
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$first = false;
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} else {
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$sql .= ',';
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}
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$sql .= $dbw->addQuotes( $badTitle );
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}
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$sql .= ')';
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$dbw->query( $sql, $fname );
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}
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} else {
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# Delete all
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$dbw->delete( 'brokenlinks', array( 'bl_from' => $this->mId ) );
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# Get addition list
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$add = $wgLinkCache->getBadLinks();
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}
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# Do additions
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$sql = '';
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if ( 0 != count ( $add ) ) {
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$arr = array();
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foreach( $add as $blt ) {
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array_push( $arr, array(
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'bl_from' => $this->mId,
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'bl_to' => $blt ) );
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}
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$dbw->insert( 'brokenlinks', $arr, $fname, array( 'IGNORE' ) );
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}
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#------------------------------------------------------------------------------
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# Image links
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$sql = "DELETE FROM $imagelinks WHERE il_from='{$this->mId}'";
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$dbw->query( $sql, $fname );
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# Get addition list
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$add = $wgLinkCache->getImageLinks();
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# Do the insertion
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$sql = '';
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$image = NS_IMAGE;
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if ( 0 != count ( $add ) ) {
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$arr = array();
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foreach ($add as $iname => $val ) {
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$nt = Title::makeTitle( $image, $iname );
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if( !$nt ) continue;
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$nt->invalidateCache();
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array_push( $arr, array(
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'il_from' => $this->mId,
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'il_to' => $iname ) );
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}
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$dbw->insert('imagelinks', $arr, $fname, array('IGNORE'));
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}
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#------------------------------------------------------------------------------
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# Category links
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if( $wgUseCategoryMagic ) {
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global $messageMemc, $wgDBname;
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# Get addition list
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$add = $wgLinkCache->getCategoryLinks();
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# select existing catlinks for this page
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$res = $dbw->select( $categorylinks, array( 'cl_to' ), array( 'cl_from' => $this->mId ),
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$fname, 'FOR UPDATE' );
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$del = array();
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if(0 != $dbw->numRows( $res )) {
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while ( $row = $dbw->fetchObject( $res ) ) {
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if(!isset($add[$row->cl_to])) {
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// in the db, but no longer in the page -> delete
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$del[] = $row->cl_to;
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} else {
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// remove already existing category memberships
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// from the add array
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unset($add[$row->cl_to]);
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}
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}
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}
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// delete any removed categorylinks
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if(count($del) > 0) {
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// delete old ones
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$dbw->delete('categorylinks', array('cl_from'=>$this->mId, 'cl_to'=>$del));
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foreach($del as $cname){
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$nt = Title::makeTitle( NS_CATEGORY, $cname );
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$nt->invalidateCache();
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// update the timestamp which indicates when the last article
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// was added or removed to/from this article
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$key = $wgDBname.':Category:'.$nt->getDBkey().':adddeltimestamp';
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$messageMemc->set( $key , wfTimestamp( TS_MW ), 24*3600 );
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#wfDebug( "Linksupdate:Cats:del: ".serialize($nt)." $key \n" );
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}
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}
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// add any new category memberships
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if (count($add) > 0) {
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$arr = array();
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foreach( $add as $cname => $sortkey ) {
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$nt = Title::makeTitle( NS_CATEGORY, $cname );
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if( !$nt ) continue;
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$nt->invalidateCache();
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// update the timestamp which indicates when the last article
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// was added or removed to/from this article
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$key = $wgDBname.':Category:'.$nt->getDBkey().':adddeltimestamp';
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$messageMemc->set( $key , wfTimestamp( TS_MW ), 24*3600 );
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#wfDebug( "Linksupdate:Cats:add: ".serialize($nt)." $key\n" );
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#wfDebug( "LU-get: ".$messageMemc->get( $key)."\n");
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array_push( $arr, array(
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'cl_from' => $this->mId,
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'cl_to' => $cname,
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'cl_sortkey' => $sortkey ) );
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}
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// do the actual sql insertion
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$dbw->insert( 'categorylinks', $arr, $fname, array( 'IGNORE' ) );
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}
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}
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$this->fixBrokenLinks();
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wfProfileOut( $fname );
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}
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/**
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* Link update which clears the previous entries and inserts new ones
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* May be slower or faster depending on level of lock contention and write speed of DB
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* Also useful where link table corruption needs to be repaired, e.g. in refreshLinks.php
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*/
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function doDumbUpdate() {
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global $wgLinkCache, $wgDBtransactions, $wgUseCategoryMagic;
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$fname = 'LinksUpdate::doDumbUpdate';
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wfProfileIn( $fname );
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$dbw =& wfGetDB( DB_MASTER );
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$links = $dbw->tableName( 'links' );
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$brokenlinks = $dbw->tableName( 'brokenlinks' );
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$imagelinks = $dbw->tableName( 'imagelinks' );
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$categorylinks = $dbw->tableName( 'categorylinks' );
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$sql = "DELETE FROM $links WHERE l_from={$this->mId}";
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$dbw->query( $sql, $fname );
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$a = $wgLinkCache->getGoodLinks();
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if ( 0 != count( $a ) ) {
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$arr = array();
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foreach( $a as $lt => $lid ) {
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array_push( $arr, array(
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'l_from' => $this->mId,
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'l_to' => $lid ) );
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}
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$dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
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}
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$sql = "DELETE FROM $brokenlinks WHERE bl_from={$this->mId}";
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$dbw->query( $sql, $fname );
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$a = $wgLinkCache->getBadLinks();
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if ( 0 != count ( $a ) ) {
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$arr = array();
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foreach( $a as $blt ) {
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array_push($arr,array(
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'bl_from' => $this->mId,
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'bl_to' => $blt));
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}
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$dbw->insert( 'brokenlinks', $arr, $fname, array( 'IGNORE' ) );
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}
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$sql = "DELETE FROM $imagelinks WHERE il_from={$this->mId}";
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$dbw->query( $sql, $fname );
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$a = $wgLinkCache->getImageLinks();
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$sql = '';
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if ( 0 != count ( $a ) ) {
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$arr = array();
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foreach( $a as $iname => $val )
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array_push( $arr, array(
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'il_from' => $this->mId,
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'il_to' => $iname ) );
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$dbw->insert( 'imagelinks', $arr, $fname, array( 'IGNORE' ) );
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}
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if( $wgUseCategoryMagic ) {
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$sql = "DELETE FROM $categorylinks WHERE cl_from='{$this->mId}'";
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$dbw->query( $sql, $fname );
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# Get addition list
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$add = $wgLinkCache->getCategoryLinks();
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# Do the insertion
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$sql = '';
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if ( 0 != count ( $add ) ) {
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$arr = array();
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foreach( $add as $cname => $sortkey ) {
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# FIXME: Change all this to avoid unnecessary duplication
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$nt = Title::makeTitle( NS_CATEGORY, $cname );
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if( !$nt ) continue;
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$nt->invalidateCache();
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array_push( $arr, array(
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'cl_from' => $this->mId,
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'cl_to' => $cname,
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'cl_sortkey' => $sortkey ) );
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}
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$dbw->insert( 'categorylinks', $arr, $fname, array( 'IGNORE' ) );
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}
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}
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$this->fixBrokenLinks();
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wfProfileOut( $fname );
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}
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/**
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* Update any brokenlinks *to* this page
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* Call for a newly created page, or just to make sure state is consistent
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*/
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function fixBrokenLinks() {
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$fname = 'LinksUpdate::fixBrokenLinks';
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$dbw =& wfGetDB( DB_MASTER );
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$page = $dbw->tableName( 'page' );
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$links = $dbw->tableName( 'links' );
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$res = $dbw->select( 'brokenlinks', array( 'bl_from' ), array( 'bl_to' => $this->mTitle ),
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$fname, 'FOR UPDATE' );
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if ( 0 == $dbw->numRows( $res ) ) { return; }
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$arr=array();
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$now = $dbw->timestamp();
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$sql2 = "UPDATE $page SET page_touched='{$now}' WHERE page_id IN (";
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$first = true;
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while ( $row = $dbw->fetchObject( $res ) ) {
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if ( ! $first ) { $sql2 .= ","; }
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$first = false;
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array_push( $arr, array(
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'l_from' => $row->bl_from,
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'l_to' => $this->mId ) );
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$sql2 .= $row->bl_from;
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}
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$sql2 .= ')';
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# Ignore errors. If a link existed in both the brokenlinks table and the links
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# table, that's an error which can be fixed at this stage by simply ignoring collisions
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$dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
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$dbw->query( $sql2, $fname );
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$dbw->delete( 'brokenlinks', array( 'bl_to' => $this->mTitle ), $fname );
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}
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}
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?>
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