mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-14 19:35:38 +00:00
c0cb0bb24d
Some mass messages appear on hundreds or thousands of pages and it's not good to try to list them all. Change-Id: Ib903d67ba4fd9d85790ef4271933991b9b6f3834
586 lines
19 KiB
PHP
586 lines
19 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use Config;
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use ConfigFactory;
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use Exception;
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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\DBError;
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use Wikimedia\Rdbms\ILBFactory;
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use Wikimedia\Rdbms\IResultWrapper;
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use Wikimedia\Rdbms\SelectQueryBuilder;
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use Wikimedia\Timestamp\TimestampException;
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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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private Config $config;
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private ILBFactory $dbConProvider;
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private ReadOnlyMode $readOnlyMode;
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private PageStore $pageStore;
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private RevisionStore $revStore;
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private TitleFormatter $titleFormatter;
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private ActorStore $actorStore;
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public function __construct(
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ConfigFactory $configFactory,
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ILBFactory $dbConProvider,
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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->config = $configFactory->makeConfig( 'discussiontools' );
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$this->dbConProvider = $dbConProvider;
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$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 = $actorStore;
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}
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/**
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* Returns true if the tables necessary for this feature haven't been created yet,
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* to allow failing softly in that case.
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*
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* @return bool
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*/
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private function isDisabled(): bool {
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return !$this->config->get( 'DiscussionToolsEnablePermalinksBackend' );
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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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* @param int|null $limit
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* @return DatabaseThreadItem[]
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*/
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public function findNewestRevisionsByName( $itemName, ?int $limit = 50 ): 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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if ( $limit !== null ) {
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$queryBuilder->limit( $limit );
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}
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$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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* @param int|null $limit
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* @return DatabaseThreadItem[]
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*/
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public function findNewestRevisionsById( $itemId, ?int $limit = 50 ): 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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if ( $limit !== null ) {
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$queryBuilder->limit( $limit );
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}
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$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->dbConProvider->getReplicaDatabase()->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 = $this->dbConProvider->getReplicaDatabase();
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$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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* @throws TimestampException
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* @throws DBError
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* @throws Exception
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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 = $this->dbConProvider->getPrimaryDatabase();
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$didInsert = false;
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$method = __METHOD__;
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// Map of item IDs (strings) to their discussiontools_item_ids.itid_id field values (ints)
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$itemIdsIds = [];
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'@phan-var array<string,int> $itemIdsIds';
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// Map of item IDs (strings) to their discussiontools_items.it_id field values (ints)
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$itemsIds = [];
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'@phan-var array<string,int> $itemsIds';
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// Insert or find discussiontools_item_ids rows, fill in itid_id field values.
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// (This is not in a transaction. Orphaned rows in this table are harmlessly ignored,
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// and long transactions caused performance issues on Wikimedia wikis: T315353#8218914.)
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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 ( $itemIdsId === false ) {
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// Use upsert() instead of insert() to handle race conditions (T322701).
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// Do a SELECT first to avoid unnecessary replication and bumping auto-increment values.
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// (We can't just use INSERT IGNORE and then do a SELECT because of implicit
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// transactions with REPEATABLE READ.)
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$dbw->upsert(
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'discussiontools_item_ids',
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[
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'itid_itemid' => $item->getId(),
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],
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'itid_itemid',
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// We update nothing, as the rows will be identical, but this can't be empty
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[ 'itid_id = itid_id' ],
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$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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$itemIdsIds[ $item->getId() ] = $itemIdsId;
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}
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// Insert or find discussiontools_items rows, fill in it_id field values.
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// (This is not in a transaction. Orphaned rows in this table are harmlessly ignored,
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// and long transactions caused performance issues on Wikimedia wikis: T315353#8218914.)
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foreach ( $threadItemSet->getThreadItems() as $item ) {
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$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 ( $itemsId === false ) {
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// Use upsert() instead of insert() to handle race conditions (T322701).
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// Do a SELECT first to avoid unnecessary replication and bumping auto-increment values.
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// (We can't just use INSERT IGNORE and then do a SELECT because of implicit
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// transactions with REPEATABLE READ.)
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$dbw->upsert(
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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(), $dbw ),
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] : [] ),
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'it_itemname',
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// We update nothing, as the rows will be identical, but this can't be empty
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[ 'it_id = it_id' ],
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$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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$itemsIds[ $item->getId() ] = $itemsId;
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}
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// Insert or update discussiontools_item_pages and discussiontools_item_revisions rows.
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// This IS in a transaction. We don't really want rows for different items on the same
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// page to point to different revisions.
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$dbw->doAtomicSection( $method, /** @throws TimestampException */ function ( $dbw ) use (
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$method, $rev, $threadItemSet, $itemsIds, $itemIdsIds, &$didInsert
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) {
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// Map of item IDs (strings) to their discussiontools_item_revisions.itr_id field values (ints)
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$itemRevisionsIds = [];
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'@phan-var array<string,int> $itemRevisionsIds';
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$revUpdateRows = [];
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// Insert or update discussiontools_item_pages rows.
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foreach ( $threadItemSet->getThreadItems() as $item ) {
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// Update (or insert) the references to oldest/newest item revision.
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// The page revision we're processing is usually the newest one, but it doesn't have to be
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// (in case of backfilling using the maintenance script, or in case of revisions being
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// imported), so we need all these funky queries to see if we need to update oldest/newest.
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$itemPagesRow = $dbw->newSelectQueryBuilder()
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->from( 'discussiontools_item_pages' )
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->join( 'revision', 'revision_oldest', [ 'itp_oldest_revision_id = revision_oldest.rev_id' ] )
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->join( 'revision', 'revision_newest', [ 'itp_newest_revision_id = revision_newest.rev_id' ] )
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->field( 'itp_id' )
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->field( 'itp_oldest_revision_id' )
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->field( 'itp_newest_revision_id' )
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->field( 'revision_oldest.rev_timestamp', 'oldest_rev_timestamp' )
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->field( 'revision_newest.rev_timestamp', 'newest_rev_timestamp' )
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->where( [
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'itp_items_id' => $itemsIds[ $item->getId() ],
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'itp_page_id' => $rev->getPageId(),
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] )
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->fetchRow();
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if ( $itemPagesRow === false ) {
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$dbw->insert(
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'discussiontools_item_pages',
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[
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'itp_items_id' => $itemsIds[ $item->getId() ],
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'itp_page_id' => $rev->getPageId(),
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'itp_oldest_revision_id' => $rev->getId(),
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'itp_newest_revision_id' => $rev->getId(),
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],
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$method
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);
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} else {
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$oldestTime = ( new MWTimestamp( $itemPagesRow->oldest_rev_timestamp ) )->getTimestamp( TS_MW );
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$newestTime = ( new MWTimestamp( $itemPagesRow->newest_rev_timestamp ) )->getTimestamp( TS_MW );
|
|
$currentTime = $rev->getTimestamp();
|
|
|
|
$oldestId = (int)$itemPagesRow->itp_oldest_revision_id;
|
|
$newestId = (int)$itemPagesRow->itp_newest_revision_id;
|
|
$currentId = $rev->getId();
|
|
|
|
$updatePageField = null;
|
|
if ( [ $oldestTime, $oldestId ] > [ $currentTime, $currentId ] ) {
|
|
$updatePageField = 'itp_oldest_revision_id';
|
|
} elseif ( [ $newestTime, $newestId ] < [ $currentTime, $currentId ] ) {
|
|
$updatePageField = 'itp_newest_revision_id';
|
|
}
|
|
if ( $updatePageField ) {
|
|
$dbw->update(
|
|
'discussiontools_item_pages',
|
|
[ $updatePageField => $rev->getId() ],
|
|
[ 'itp_id' => $itemPagesRow->itp_id ],
|
|
$method
|
|
);
|
|
if ( $oldestId !== $newestId ) {
|
|
// This causes most rows in discussiontools_item_revisions referring to the previously
|
|
// oldest/newest revision to be unused, so try re-using them.
|
|
$revUpdateRows[ $itemsIds[ $item->getId() ] ] = $itemPagesRow->$updatePageField;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Insert or update discussiontools_item_revisions rows, fill in itr_id field values.
|
|
foreach ( $threadItemSet->getThreadItems() as $item ) {
|
|
$transcl = $item->getTranscludedFrom();
|
|
$newOrUpdateRevRow =
|
|
[
|
|
'itr_itemid_id' => $itemIdsIds[ $item->getId() ],
|
|
'itr_revision_id' => $rev->getId(),
|
|
'itr_items_id' => $itemsIds[ $item->getId() ],
|
|
'itr_parent_id' =>
|
|
// This assumes that parent items were processed first
|
|
$item->getParent() ? $itemRevisionsIds[ $item->getParent()->getId() ] : null,
|
|
'itr_transcludedfrom' =>
|
|
$transcl === false ? null : (
|
|
$transcl === true ? 0 :
|
|
$this->pageStore->getPageByText( $transcl )->getId()
|
|
),
|
|
'itr_level' => $item->getLevel(),
|
|
] +
|
|
( $item instanceof HeadingItem ? [
|
|
'itr_headinglevel' => $item->isPlaceholderHeading() ? null : $item->getHeadingLevel(),
|
|
] : [] );
|
|
|
|
$itemRevisionsId = $dbw->newSelectQueryBuilder()
|
|
->from( 'discussiontools_item_revisions' )
|
|
->field( 'itr_id' )
|
|
->where( [
|
|
'itr_itemid_id' => $itemIdsIds[ $item->getId() ],
|
|
'itr_items_id' => $itemsIds[ $item->getId() ],
|
|
'itr_revision_id' => $rev->getId(),
|
|
] )
|
|
->caller( $method )
|
|
->fetchField();
|
|
if ( $itemRevisionsId === false ) {
|
|
$itemRevisionsUpdateId = null;
|
|
if ( isset( $revUpdateRows[ $itemsIds[ $item->getId() ] ] ) ) {
|
|
$itemRevisionsUpdateId = $dbw->newSelectQueryBuilder()
|
|
->from( 'discussiontools_item_revisions' )
|
|
->field( 'itr_id' )
|
|
->where( [
|
|
'itr_revision_id' => $revUpdateRows[ $itemsIds[ $item->getId() ] ],
|
|
// We only keep up to 2 discussiontools_item_revisions rows with the same
|
|
// (itr_itemid_id, itr_items_id) pair, for the oldest and newest revision known.
|
|
// Here we find any rows we don't want to keep and re-use them.
|
|
'itr_itemid_id' => $itemIdsIds[ $item->getId() ],
|
|
'itr_items_id' => $itemsIds[ $item->getId() ],
|
|
] )
|
|
->caller( $method )
|
|
->fetchField();
|
|
// The row to re-use may not be found if it has a different itr_itemid_id than the row
|
|
// we want to add.
|
|
}
|
|
if ( $itemRevisionsUpdateId ) {
|
|
$dbw->update(
|
|
'discussiontools_item_revisions',
|
|
$newOrUpdateRevRow,
|
|
[ 'itr_id' => $itemRevisionsUpdateId ],
|
|
$method
|
|
);
|
|
$itemRevisionsId = $itemRevisionsUpdateId;
|
|
} else {
|
|
$dbw->insert(
|
|
'discussiontools_item_revisions',
|
|
$newOrUpdateRevRow,
|
|
$method
|
|
);
|
|
$itemRevisionsId = $dbw->insertId();
|
|
}
|
|
$didInsert = true;
|
|
}
|
|
|
|
$itemRevisionsIds[ $item->getId() ] = $itemRevisionsId;
|
|
}
|
|
}, $dbw::ATOMIC_CANCELABLE );
|
|
|
|
return $didInsert;
|
|
}
|
|
}
|