mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-13 18:37:07 +00:00
4ffebd80f2
From in-person code review with Amir: using tableExists() is a bad idea, because the table might not consistently exists on all replicas. It's better to have a config option despite the inconvenience. Bug: T315353 Change-Id: I728759634c454c0dcbdc4603c15cab60415c7c03
567 lines
18 KiB
PHP
567 lines
18 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use ConfigFactory;
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use MediaWiki\Extension\DiscussionTools\ThreadItem\CommentItem;
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use MediaWiki\Extension\DiscussionTools\ThreadItem\DatabaseCommentItem;
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use MediaWiki\Extension\DiscussionTools\ThreadItem\DatabaseHeadingItem;
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use MediaWiki\Extension\DiscussionTools\ThreadItem\DatabaseThreadItem;
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use MediaWiki\Extension\DiscussionTools\ThreadItem\HeadingItem;
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use MediaWiki\Page\PageStore;
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use MediaWiki\Revision\RevisionRecord;
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use MediaWiki\Revision\RevisionStore;
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use MediaWiki\User\ActorStore;
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use MWTimestamp;
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use ReadOnlyMode;
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use stdClass;
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use TitleFormatter;
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use Wikimedia\Rdbms\IDatabase;
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use Wikimedia\Rdbms\ILBFactory;
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use Wikimedia\Rdbms\ILoadBalancer;
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use Wikimedia\Rdbms\IResultWrapper;
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use Wikimedia\Rdbms\SelectQueryBuilder;
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/**
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* Stores and fetches ThreadItemSets from the database.
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*/
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class ThreadItemStore {
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/** @var ConfigFactory */
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private $configFactory;
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/** @var ILoadBalancer */
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private $loadBalancer;
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/** @var ReadOnlyMode */
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private $readOnlyMode;
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/** @var PageStore */
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private $pageStore;
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/** @var RevisionStore */
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private $revStore;
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/** @var TitleFormatter */
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private $titleFormatter;
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/** @var ActorStore */
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private $actorStore;
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/**
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* @param ConfigFactory $configFactory
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* @param ILBFactory $lbFactory
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* @param ReadOnlyMode $readOnlyMode
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* @param PageStore $pageStore
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* @param RevisionStore $revStore
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* @param TitleFormatter $titleFormatter
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* @param ActorStore $actorStore
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*/
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public function __construct(
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ConfigFactory $configFactory,
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ILBFactory $lbFactory,
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ReadOnlyMode $readOnlyMode,
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PageStore $pageStore,
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RevisionStore $revStore,
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TitleFormatter $titleFormatter,
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ActorStore $actorStore
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) {
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$this->configFactory = $configFactory;
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$this->loadBalancer = $lbFactory->getMainLB();
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$this->readOnlyMode = $readOnlyMode;
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$this->pageStore = $pageStore;
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$this->revStore = $revStore;
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$this->titleFormatter = $titleFormatter;
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$this->actorStore = $actorStore;
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}
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/**
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* Returns true if the tables necessary for this feature haven't been created yet,
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* to allow failing softly in that case.
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*
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* @return bool
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*/
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private function isDisabled(): bool {
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$dtConfig = $this->configFactory->makeConfig( 'discussiontools' );
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return !$dtConfig->get( 'DiscussionToolsEnablePermalinksBackend' );
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}
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/**
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* @param int $dbIndex DB_PRIMARY or DB_REPLICA
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*
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* @return IDatabase
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*/
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private function getConnectionRef( int $dbIndex ): IDatabase {
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return $this->loadBalancer->getConnectionRef( $dbIndex, [ 'watchlist' ] );
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}
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/**
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* Find the thread items with the given name in the newest revision of every page in which they
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* have appeared.
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*
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* @param string|string[] $itemName
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* @return DatabaseThreadItem[]
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*/
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public function findNewestRevisionsByName( $itemName ): array {
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if ( $this->isDisabled() ) {
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return [];
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}
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$queryBuilder = $this->getIdsNamesBuilder()
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->where( [
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'it_itemname' => $itemName,
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// Disallow querying for headings of sections that contain no comments.
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// They all share the same name, so this would return a huge useless list on most wikis.
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// (But we still store them, as we might need this data elsewhere.)
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"it_itemname != 'h-'",
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] );
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$result = $this->fetchItemsResultSet( $queryBuilder );
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$revs = $this->fetchRevisionAndPageForItems( $result );
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$threadItems = [];
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foreach ( $result as $row ) {
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$threadItem = $this->getThreadItemFromRow( $row, null, $revs );
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if ( $threadItem ) {
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$threadItems[] = $threadItem;
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}
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}
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return $threadItems;
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}
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/**
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* Find the thread items with the given ID in the newest revision of every page in which they have
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* appeared.
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*
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* @param string|string[] $itemId
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* @return DatabaseThreadItem[]
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*/
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public function findNewestRevisionsById( $itemId ): array {
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if ( $this->isDisabled() ) {
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return [];
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}
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$queryBuilder = $this->getIdsNamesBuilder();
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// First find the name associated with the ID; then find by name. Otherwise we wouldn't find the
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// latest revision in case comment ID changed, e.g. the comment was moved elsewhere on the page.
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$itemNameQueryBuilder = $this->getIdsNamesBuilder()
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->where( [ 'itid_itemid' => $itemId ] )
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->field( 'it_itemname' );
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// I think there may be more than 1 only in case of headings?
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// For comments, any ID corresponds to just 1 name.
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// Not sure how bad it is to not have limit( 1 ) here?
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// It might scan a bunch of rows...
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// ->limit( 1 );
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$queryBuilder
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->where( [
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'it_itemname IN (' . $itemNameQueryBuilder->getSQL() . ')',
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"it_itemname != 'h-'",
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] );
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$result = $this->fetchItemsResultSet( $queryBuilder );
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$revs = $this->fetchRevisionAndPageForItems( $result );
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$threadItems = [];
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foreach ( $result as $row ) {
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$threadItem = $this->getThreadItemFromRow( $row, null, $revs );
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if ( $threadItem ) {
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$threadItems[] = $threadItem;
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}
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}
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return $threadItems;
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}
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/**
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* @param SelectQueryBuilder $queryBuilder
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* @return IResultWrapper
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*/
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private function fetchItemsResultSet( SelectQueryBuilder $queryBuilder ): IResultWrapper {
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$queryBuilder
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->fields( [
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'itr_id',
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'it_itemname',
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'it_timestamp',
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'it_actor',
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'itid_itemid',
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'itr_parent_id',
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'itr_transcludedfrom',
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'itr_level',
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'itr_headinglevel',
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'itr_revision_id',
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] )
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// PageStore fields for the transcluded-from page
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->leftJoin( 'page', null, [ 'page_id = itr_transcludedfrom' ] )
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->fields( $this->pageStore->getSelectFields() )
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// ActorStore fields for the author
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->leftJoin( 'actor', null, [ 'actor_id = it_actor' ] )
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->fields( [ 'actor_id', 'actor_name', 'actor_user' ] )
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// Parent item ID (the string, not just the primary key)
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->leftJoin(
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$this->getIdsNamesBuilder()
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->fields( [
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'itr_parent__itr_id' => 'itr_id',
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'itr_parent__itid_itemid' => 'itid_itemid',
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] ),
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null,
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[ 'itr_parent_id = itr_parent__itr_id' ]
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)
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->field( 'itr_parent__itid_itemid' );
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return $queryBuilder->fetchResultSet();
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}
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/**
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* @param IResultWrapper $result
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* @return stdClass[]
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*/
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private function fetchRevisionAndPageForItems( IResultWrapper $result ): array {
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// This could theoretically be done in the same query as fetchItemsResultSet(),
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// but the resulting query would be two screens long
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// and we'd have to alias a lot of fields to avoid conflicts.
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$revs = [];
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foreach ( $result as $row ) {
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$revs[ $row->itr_revision_id ] = null;
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}
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$revQueryBuilder = $this->getConnectionRef( DB_REPLICA )->newSelectQueryBuilder()
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->queryInfo( $this->revStore->getQueryInfo( [ 'page' ] ) )
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->fields( $this->pageStore->getSelectFields() )
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->where( $revs ? [ 'rev_id' => array_keys( $revs ) ] : '0=1' );
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$revResult = $revQueryBuilder->fetchResultSet();
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foreach ( $revResult as $row ) {
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$revs[ $row->rev_id ] = $row;
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}
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return $revs;
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}
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/**
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* @param stdClass $row
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* @param DatabaseThreadItemSet|null $set
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* @param array $revs
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* @return DatabaseThreadItem|null
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*/
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private function getThreadItemFromRow(
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stdClass $row, ?DatabaseThreadItemSet $set, array $revs
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): ?DatabaseThreadItem {
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if ( $revs[ $row->itr_revision_id ] === null ) {
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// We didn't find the 'revision' table row at all, this revision is deleted.
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// (The page may or may not have other non-deleted revisions.)
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// Pretend the thread item doesn't exist to avoid leaking data to users who shouldn't see it.
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// TODO Allow privileged users to see it (we'd need to query from 'archive')
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return null;
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}
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$revRow = $revs[$row->itr_revision_id];
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$page = $this->pageStore->newPageRecordFromRow( $revRow );
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$rev = $this->revStore->newRevisionFromRow( $revRow );
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if ( $rev->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
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// This revision is revision-deleted.
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// TODO Allow privileged users to see it
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return null;
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}
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if ( $set && $row->itr_parent__itid_itemid ) {
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$parent = $set->findCommentById( $row->itr_parent__itid_itemid );
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} else {
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$parent = null;
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}
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$transcludedFrom = $row->itr_transcludedfrom === null ? false : (
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$row->itr_transcludedfrom === '0' ? true :
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$this->titleFormatter->getPrefixedText(
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$this->pageStore->newPageRecordFromRow( $row )
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)
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);
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if ( $row->it_timestamp !== null && $row->it_actor !== null ) {
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$author = $this->actorStore->newActorFromRow( $row )->getName();
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$item = new DatabaseCommentItem(
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$page,
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$rev,
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$row->it_itemname,
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$row->itid_itemid,
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$parent,
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$transcludedFrom,
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(int)$row->itr_level,
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$row->it_timestamp,
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$author
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);
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} else {
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$item = new DatabaseHeadingItem(
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$page,
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$rev,
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$row->it_itemname,
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$row->itid_itemid,
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$parent,
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$transcludedFrom,
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(int)$row->itr_level,
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$row->itr_headinglevel === null ? null : (int)$row->itr_headinglevel
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);
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}
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if ( $parent ) {
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$parent->addReply( $item );
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}
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return $item;
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}
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/**
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* Find the thread item set for the given revision, assuming that it is the current revision of
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* its page.
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*
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* @param int $revId
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* @return DatabaseThreadItemSet
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*/
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public function findThreadItemsInCurrentRevision( int $revId ): DatabaseThreadItemSet {
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if ( $this->isDisabled() ) {
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return new DatabaseThreadItemSet();
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}
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$queryBuilder = $this->getIdsNamesBuilder();
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$queryBuilder
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->where( [ 'itr_revision_id' => $revId ] )
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// We must process parents before their children in the loop later
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->orderBy( 'itr_id', SelectQueryBuilder::SORT_ASC );
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$result = $this->fetchItemsResultSet( $queryBuilder );
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$revs = $this->fetchRevisionAndPageForItems( $result );
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$set = new DatabaseThreadItemSet();
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foreach ( $result as $row ) {
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$threadItem = $this->getThreadItemFromRow( $row, $set, $revs );
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if ( $threadItem ) {
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$set->addThreadItem( $threadItem );
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$set->updateIdAndNameMaps( $threadItem );
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}
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}
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return $set;
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}
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/**
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* @return SelectQueryBuilder
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*/
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private function getIdsNamesBuilder(): SelectQueryBuilder {
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$dbr = $this->getConnectionRef( DB_REPLICA );
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$queryBuilder = $dbr->newSelectQueryBuilder()
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->from( 'discussiontools_items' )
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->join( 'discussiontools_item_pages', null, [ 'itp_items_id = it_id' ] )
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->join( 'discussiontools_item_revisions', null, [
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'itr_items_id = it_id',
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// Only the latest revision of the items with each name
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'itr_revision_id = itp_newest_revision_id',
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] )
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->join( 'discussiontools_item_ids', null, [ 'itid_id = itr_itemid_id' ] );
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return $queryBuilder;
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}
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/**
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* Store the thread item set.
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*
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* @param RevisionRecord $rev
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* @param ThreadItemSet $threadItemSet
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* @return bool
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*/
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public function insertThreadItems( RevisionRecord $rev, ThreadItemSet $threadItemSet ): bool {
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if ( $this->isDisabled() || $this->readOnlyMode->isReadOnly() ) {
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return false;
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}
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$dbw = $this->getConnectionRef( DB_PRIMARY );
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$didInsert = false;
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$method = __METHOD__;
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$dbw->doAtomicSection( $method, function ( $dbw ) use ( $method, $rev, $threadItemSet, &$didInsert ) {
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$itemRevisionsIds = [];
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foreach ( $threadItemSet->getThreadItems() as $item ) {
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$itemIdsId = $dbw->newSelectQueryBuilder()
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->from( 'discussiontools_item_ids' )
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->field( 'itid_id' )
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->where( [ 'itid_itemid' => $item->getId() ] )
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->caller( $method )
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->fetchField();
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if ( $itemIdsId === false ) {
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$dbw->insert(
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'discussiontools_item_ids',
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[
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'itid_itemid' => $item->getId(),
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],
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$method
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);
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$itemIdsId = $dbw->insertId();
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$didInsert = true;
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}
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$itemsId = $dbw->newSelectQueryBuilder()
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->from( 'discussiontools_items' )
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->field( 'it_id' )
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->where( [ 'it_itemname' => $item->getName() ] )
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->caller( $method )
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->fetchField();
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if ( $itemsId === false ) {
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$dbw->insert(
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'discussiontools_items',
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[
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'it_itemname' => $item->getName(),
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] +
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( $item instanceof CommentItem ? [
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'it_timestamp' =>
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$dbw->timestamp( $item->getTimestampString() ),
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'it_actor' =>
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$this->actorStore->findActorIdByName( $item->getAuthor(), $dbw ),
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] : [] ),
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$method
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);
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$itemsId = $dbw->insertId();
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$didInsert = true;
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}
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$itemRevisionsId = $dbw->newSelectQueryBuilder()
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->from( 'discussiontools_item_revisions' )
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->field( 'itr_id' )
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->where( [
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'itr_itemid_id' => $itemIdsId,
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'itr_revision_id' => $rev->getId(),
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] )
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->caller( $method )
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->fetchField();
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if ( $itemRevisionsId === false ) {
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$transcl = $item->getTranscludedFrom();
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$dbw->insert(
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'discussiontools_item_revisions',
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[
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'itr_itemid_id' => $itemIdsId,
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'itr_revision_id' => $rev->getId(),
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'itr_items_id' => $itemsId,
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'itr_parent_id' =>
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// This assumes that parent items were processed first
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$item->getParent() ? $itemRevisionsIds[ $item->getParent()->getId() ] : null,
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'itr_transcludedfrom' =>
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$transcl === false ? null : (
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$transcl === true ? 0 :
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$this->pageStore->getPageByText( $transcl )->getId()
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),
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'itr_level' => $item->getLevel(),
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] +
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( $item instanceof HeadingItem ? [
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'itr_headinglevel' => $item->isPlaceholderHeading() ? null : $item->getHeadingLevel(),
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] : [] ),
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$method
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);
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$itemRevisionsId = $dbw->insertId();
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$didInsert = true;
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}
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$itemRevisionsIds[ $item->getId() ] = $itemRevisionsId;
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// Update (or insert) the references to oldest/newest item revision.
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// The page revision we're processing is usually the newest one, but it doesn't have to be
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// (in case of backfilling using the maintenance script, or in case of revisions being
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// imported), so we need all these funky queries to see if we need to update oldest/newest.
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// This should be a single upsert query (INSERT ... ON DUPLICATE KEY UPDATE), however it
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// doesn't work in practice:
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//
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// - Attempt 1:
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// https://gerrit.wikimedia.org/r/c/mediawiki/extensions/DiscussionTools/+/771974/14/includes/ThreadItemStore.php#451
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//
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// This is the same logic as below in SQL: only doing a single comparison of the timestamp
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// of the current revision to the existing data in discussiontools_item_pages.
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// It worked great on my machine, `mysql --version`:
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// mysql Ver 8.0.29-0ubuntu0.20.04.3 for Linux on x86_64 ((Ubuntu))
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// but it failed in Wikimedia CI, `mysql --version`:
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// mysql Ver 15.1 Distrib 10.3.34-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
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// …with the error:
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// "Error 1054: Unknown column 'itp_oldest_revision_id' in 'where clause'".
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// Apparently it doesn't like dependent subqueries in the UPDATE part of an upsert.
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// I'm not sure if it's a bug in MariaDB or if you're not supposed to do that.
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//
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// - Attempt 2:
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// https://gerrit.wikimedia.org/r/c/mediawiki/extensions/DiscussionTools/+/771974/15/includes/ThreadItemStore.php#451
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//
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// This avoids the dependent subquery: instead of comparing to the existing data in
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// discussiontools_item_pages, it just takes the IDs with min/max timestamp from
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// discussiontools_item_revisions/revision. This should be a simple lookup from an index,
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// but apparently it doesn't work that way and is significantly slower (the maintenance
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// script went from 13 minutes to 18 minutes when processing a few thousands of revisions
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// on my local testing wiki).
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//
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// In the end, the solution below using multiple queries is just as fast as the original,
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// and only a little more verbose.
|
|
|
|
$itemPagesRow = $dbw->newSelectQueryBuilder()
|
|
->from( 'discussiontools_item_pages' )
|
|
->join( 'revision', 'revision_oldest', [ 'itp_oldest_revision_id = revision_oldest.rev_id' ] )
|
|
->join( 'revision', 'revision_newest', [ 'itp_newest_revision_id = revision_newest.rev_id' ] )
|
|
->field( 'itp_id' )
|
|
->field( 'revision_oldest.rev_timestamp', 'oldest_rev_timestamp' )
|
|
->field( 'revision_newest.rev_timestamp', 'newest_rev_timestamp' )
|
|
->where( [
|
|
'itp_items_id' => $itemsId,
|
|
'itp_page_id' => $rev->getPageId(),
|
|
] )
|
|
->fetchRow();
|
|
if ( $itemPagesRow === false ) {
|
|
$dbw->insert(
|
|
'discussiontools_item_pages',
|
|
[
|
|
'itp_items_id' => $itemsId,
|
|
'itp_page_id' => $rev->getPageId(),
|
|
'itp_oldest_revision_id' => $rev->getId(),
|
|
'itp_newest_revision_id' => $rev->getId(),
|
|
],
|
|
$method
|
|
);
|
|
} else {
|
|
$existingTime = ( new MWTimestamp( $itemPagesRow->oldest_rev_timestamp ) )->getTimestamp( TS_MW );
|
|
if ( $existingTime >= $rev->getTimestamp() ) {
|
|
$dbw->update(
|
|
'discussiontools_item_pages',
|
|
[ 'itp_oldest_revision_id' => $rev->getId() ],
|
|
[ 'itp_id' => $itemPagesRow->itp_id ],
|
|
$method
|
|
);
|
|
}
|
|
$existingTime = ( new MWTimestamp( $itemPagesRow->newest_rev_timestamp ) )->getTimestamp( TS_MW );
|
|
if ( $existingTime <= $rev->getTimestamp() ) {
|
|
$dbw->update(
|
|
'discussiontools_item_pages',
|
|
[ 'itp_newest_revision_id' => $rev->getId() ],
|
|
[ 'itp_id' => $itemPagesRow->itp_id ],
|
|
$method
|
|
);
|
|
}
|
|
}
|
|
|
|
// Delete rows that we don't care about, to save space (item revisions with the same ID and
|
|
// name as the one we just inserted, which are not the oldest or newest revision).
|
|
$oldestRevisionSql = $dbw->newSelectQueryBuilder()
|
|
->from( 'discussiontools_item_pages' )
|
|
->field( 'itp_oldest_revision_id' )
|
|
->where( [ 'itp_items_id' => $itemsId ] )
|
|
->caller( $method )
|
|
->getSQL();
|
|
$newestRevisionSql = $dbw->newSelectQueryBuilder()
|
|
->from( 'discussiontools_item_pages' )
|
|
->field( 'itp_newest_revision_id' )
|
|
->where( [ 'itp_items_id' => $itemsId ] )
|
|
->caller( $method )
|
|
->getSQL();
|
|
$dbw->delete(
|
|
'discussiontools_item_revisions',
|
|
[
|
|
'itr_itemid_id' => $itemIdsId,
|
|
'itr_items_id' => $itemsId,
|
|
"itr_revision_id NOT IN ($oldestRevisionSql)",
|
|
"itr_revision_id NOT IN ($newestRevisionSql)",
|
|
],
|
|
$method
|
|
);
|
|
}
|
|
}, $dbw::ATOMIC_CANCELABLE );
|
|
|
|
return $didInsert;
|
|
}
|
|
}
|