+<?php
+/**
+ * Service for looking up page revisions.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * Attribution notice: when this file was created, much of its content was taken
+ * from the Revision.php file as present in release 1.30. Refer to the history
+ * of that file for original authorship.
+ *
+ * @file
+ */
+
+namespace MediaWiki\Revision;
+
+use ActorMigration;
+use CommentStore;
+use CommentStoreComment;
+use Content;
+use ContentHandler;
+use DBAccessObjectUtils;
+use Hooks;
+use IDBAccessObject;
+use InvalidArgumentException;
+use IP;
+use LogicException;
+use MediaWiki\Linker\LinkTarget;
+use MediaWiki\Storage\BlobAccessException;
+use MediaWiki\Storage\BlobStore;
+use MediaWiki\Storage\NameTableAccessException;
+use MediaWiki\Storage\NameTableStore;
+use MediaWiki\Storage\SqlBlobStore;
+use MediaWiki\User\UserIdentity;
+use MediaWiki\User\UserIdentityValue;
+use Message;
+use MWException;
+use MWUnknownContentModelException;
+use Psr\Log\LoggerAwareInterface;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+use RecentChange;
+use Revision;
+use RuntimeException;
+use stdClass;
+use Title;
+use User;
+use WANObjectCache;
+use Wikimedia\Assert\Assert;
+use Wikimedia\Rdbms\Database;
+use Wikimedia\Rdbms\DBConnRef;
+use Wikimedia\Rdbms\IDatabase;
+use Wikimedia\Rdbms\ILoadBalancer;
+
+/**
+ * Service for looking up page revisions.
+ *
+ * @since 1.31
+ * @since 1.32 Renamed from MediaWiki\Storage\RevisionStore
+ *
+ * @note This was written to act as a drop-in replacement for the corresponding
+ * static methods in Revision.
+ */
+class RevisionStore
+ implements IDBAccessObject, RevisionFactory, RevisionLookup, LoggerAwareInterface {
+
+ const ROW_CACHE_KEY = 'revision-row-1.29';
+
+ /**
+ * @var SqlBlobStore
+ */
+ private $blobStore;
+
+ /**
+ * @var bool|string
+ */
+ private $wikiId;
+
+ /**
+ * @var boolean
+ * @see $wgContentHandlerUseDB
+ */
+ private $contentHandlerUseDB = true;
+
+ /**
+ * @var ILoadBalancer
+ */
+ private $loadBalancer;
+
+ /**
+ * @var WANObjectCache
+ */
+ private $cache;
+
+ /**
+ * @var CommentStore
+ */
+ private $commentStore;
+
+ /**
+ * @var ActorMigration
+ */
+ private $actorMigration;
+
+ /**
+ * @var LoggerInterface
+ */
+ private $logger;
+
+ /**
+ * @var NameTableStore
+ */
+ private $contentModelStore;
+
+ /**
+ * @var NameTableStore
+ */
+ private $slotRoleStore;
+
+ /** @var int An appropriate combination of SCHEMA_COMPAT_XXX flags. */
+ private $mcrMigrationStage;
+
+ /**
+ * @todo $blobStore should be allowed to be any BlobStore!
+ *
+ * @param ILoadBalancer $loadBalancer
+ * @param SqlBlobStore $blobStore
+ * @param WANObjectCache $cache A cache for caching revision rows. This can be the local
+ * wiki's default instance even if $wikiId refers to a different wiki, since
+ * makeGlobalKey() is used to constructed a key that allows cached revision rows from
+ * the same database to be re-used between wikis. For example, enwiki and frwiki will
+ * use the same cache keys for revision rows from the wikidatawiki database, regardless
+ * of the cache's default key space.
+ * @param CommentStore $commentStore
+ * @param NameTableStore $contentModelStore
+ * @param NameTableStore $slotRoleStore
+ * @param int $mcrMigrationStage An appropriate combination of SCHEMA_COMPAT_XXX flags
+ * @param ActorMigration $actorMigration
+ * @param bool|string $wikiId
+ *
+ * @throws MWException if $mcrMigrationStage or $wikiId is invalid.
+ */
+ public function __construct(
+ ILoadBalancer $loadBalancer,
+ SqlBlobStore $blobStore,
+ WANObjectCache $cache,
+ CommentStore $commentStore,
+ NameTableStore $contentModelStore,
+ NameTableStore $slotRoleStore,
+ $mcrMigrationStage,
+ ActorMigration $actorMigration,
+ $wikiId = false
+ ) {
+ Assert::parameterType( 'string|boolean', $wikiId, '$wikiId' );
+ Assert::parameterType( 'integer', $mcrMigrationStage, '$mcrMigrationStage' );
+ Assert::parameter(
+ ( $mcrMigrationStage & SCHEMA_COMPAT_READ_BOTH ) !== SCHEMA_COMPAT_READ_BOTH,
+ '$mcrMigrationStage',
+ 'Reading from the old and the new schema at the same time is not supported.'
+ );
+ Assert::parameter(
+ ( $mcrMigrationStage & SCHEMA_COMPAT_READ_BOTH ) !== 0,
+ '$mcrMigrationStage',
+ 'Reading needs to be enabled for the old or the new schema.'
+ );
+ Assert::parameter(
+ ( $mcrMigrationStage & SCHEMA_COMPAT_WRITE_BOTH ) !== 0,
+ '$mcrMigrationStage',
+ 'Writing needs to be enabled for the old or the new schema.'
+ );
+ Assert::parameter(
+ ( $mcrMigrationStage & SCHEMA_COMPAT_READ_OLD ) === 0
+ || ( $mcrMigrationStage & SCHEMA_COMPAT_WRITE_OLD ) !== 0,
+ '$mcrMigrationStage',
+ 'Cannot read the old schema when not also writing it.'
+ );
+ Assert::parameter(
+ ( $mcrMigrationStage & SCHEMA_COMPAT_READ_NEW ) === 0
+ || ( $mcrMigrationStage & SCHEMA_COMPAT_WRITE_NEW ) !== 0,
+ '$mcrMigrationStage',
+ 'Cannot read the new schema when not also writing it.'
+ );
+
+ $this->loadBalancer = $loadBalancer;
+ $this->blobStore = $blobStore;
+ $this->cache = $cache;
+ $this->commentStore = $commentStore;
+ $this->contentModelStore = $contentModelStore;
+ $this->slotRoleStore = $slotRoleStore;
+ $this->mcrMigrationStage = $mcrMigrationStage;
+ $this->actorMigration = $actorMigration;
+ $this->wikiId = $wikiId;
+ $this->logger = new NullLogger();
+ }
+
+ /**
+ * @param int $flags A combination of SCHEMA_COMPAT_XXX flags.
+ * @return bool True if all the given flags were set in the $mcrMigrationStage
+ * parameter passed to the constructor.
+ */
+ private function hasMcrSchemaFlags( $flags ) {
+ return ( $this->mcrMigrationStage & $flags ) === $flags;
+ }
+
+ /**
+ * Throws a RevisionAccessException if this RevisionStore is configured for cross-wiki loading
+ * and still reading from the old DB schema.
+ *
+ * @throws RevisionAccessException
+ */
+ private function assertCrossWikiContentLoadingIsSafe() {
+ if ( $this->wikiId !== false && $this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_OLD ) ) {
+ throw new RevisionAccessException(
+ "Cross-wiki content loading is not supported by the pre-MCR schema"
+ );
+ }
+ }
+
+ public function setLogger( LoggerInterface $logger ) {
+ $this->logger = $logger;
+ }
+
+ /**
+ * @return bool Whether the store is read-only
+ */
+ public function isReadOnly() {
+ return $this->blobStore->isReadOnly();
+ }
+
+ /**
+ * @return bool
+ */
+ public function getContentHandlerUseDB() {
+ return $this->contentHandlerUseDB;
+ }
+
+ /**
+ * @see $wgContentHandlerUseDB
+ * @param bool $contentHandlerUseDB
+ * @throws MWException
+ */
+ public function setContentHandlerUseDB( $contentHandlerUseDB ) {
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_NEW )
+ || $this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_NEW )
+ ) {
+ if ( !$contentHandlerUseDB ) {
+ throw new MWException(
+ 'Content model must be stored in the database for multi content revision migration.'
+ );
+ }
+ }
+ $this->contentHandlerUseDB = $contentHandlerUseDB;
+ }
+
+ /**
+ * @return ILoadBalancer
+ */
+ private function getDBLoadBalancer() {
+ return $this->loadBalancer;
+ }
+
+ /**
+ * @param int $mode DB_MASTER or DB_REPLICA
+ *
+ * @return IDatabase
+ */
+ private function getDBConnection( $mode ) {
+ $lb = $this->getDBLoadBalancer();
+ return $lb->getConnection( $mode, [], $this->wikiId );
+ }
+
+ /**
+ * @param int $queryFlags a bit field composed of READ_XXX flags
+ *
+ * @return DBConnRef
+ */
+ private function getDBConnectionRefForQueryFlags( $queryFlags ) {
+ list( $mode, ) = DBAccessObjectUtils::getDBOptions( $queryFlags );
+ return $this->getDBConnectionRef( $mode );
+ }
+
+ /**
+ * @param IDatabase $connection
+ */
+ private function releaseDBConnection( IDatabase $connection ) {
+ $lb = $this->getDBLoadBalancer();
+ $lb->reuseConnection( $connection );
+ }
+
+ /**
+ * @param int $mode DB_MASTER or DB_REPLICA
+ *
+ * @return DBConnRef
+ */
+ private function getDBConnectionRef( $mode ) {
+ $lb = $this->getDBLoadBalancer();
+ return $lb->getConnectionRef( $mode, [], $this->wikiId );
+ }
+
+ /**
+ * Determines the page Title based on the available information.
+ *
+ * MCR migration note: this corresponds to Revision::getTitle
+ *
+ * @note this method should be private, external use should be avoided!
+ *
+ * @param int|null $pageId
+ * @param int|null $revId
+ * @param int $queryFlags
+ *
+ * @return Title
+ * @throws RevisionAccessException
+ */
+ public function getTitle( $pageId, $revId, $queryFlags = self::READ_NORMAL ) {
+ if ( !$pageId && !$revId ) {
+ throw new InvalidArgumentException( '$pageId and $revId cannot both be 0 or null' );
+ }
+
+ // This method recalls itself with READ_LATEST if READ_NORMAL doesn't get us a Title
+ // So ignore READ_LATEST_IMMUTABLE flags and handle the fallback logic in this method
+ if ( DBAccessObjectUtils::hasFlags( $queryFlags, self::READ_LATEST_IMMUTABLE ) ) {
+ $queryFlags = self::READ_NORMAL;
+ }
+
+ $canUseTitleNewFromId = ( $pageId !== null && $pageId > 0 && $this->wikiId === false );
+ list( $dbMode, $dbOptions ) = DBAccessObjectUtils::getDBOptions( $queryFlags );
+ $titleFlags = ( $dbMode == DB_MASTER ? Title::GAID_FOR_UPDATE : 0 );
+
+ // Loading by ID is best, but Title::newFromID does not support that for foreign IDs.
+ if ( $canUseTitleNewFromId ) {
+ // TODO: better foreign title handling (introduce TitleFactory)
+ $title = Title::newFromID( $pageId, $titleFlags );
+ if ( $title ) {
+ return $title;
+ }
+ }
+
+ // rev_id is defined as NOT NULL, but this revision may not yet have been inserted.
+ $canUseRevId = ( $revId !== null && $revId > 0 );
+
+ if ( $canUseRevId ) {
+ $dbr = $this->getDBConnectionRef( $dbMode );
+ // @todo: Title::getSelectFields(), or Title::getQueryInfo(), or something like that
+ $row = $dbr->selectRow(
+ [ 'revision', 'page' ],
+ [
+ 'page_namespace',
+ 'page_title',
+ 'page_id',
+ 'page_latest',
+ 'page_is_redirect',
+ 'page_len',
+ ],
+ [ 'rev_id' => $revId ],
+ __METHOD__,
+ $dbOptions,
+ [ 'page' => [ 'JOIN', 'page_id=rev_page' ] ]
+ );
+ if ( $row ) {
+ // TODO: better foreign title handling (introduce TitleFactory)
+ return Title::newFromRow( $row );
+ }
+ }
+
+ // If we still don't have a title, fallback to master if that wasn't already happening.
+ if ( $dbMode !== DB_MASTER ) {
+ $title = $this->getTitle( $pageId, $revId, self::READ_LATEST );
+ if ( $title ) {
+ $this->logger->info(
+ __METHOD__ . ' fell back to READ_LATEST and got a Title.',
+ [ 'trace' => wfBacktrace() ]
+ );
+ return $title;
+ }
+ }
+
+ throw new RevisionAccessException(
+ "Could not determine title for page ID $pageId and revision ID $revId"
+ );
+ }
+
+ /**
+ * @param mixed $value
+ * @param string $name
+ *
+ * @throws IncompleteRevisionException if $value is null
+ * @return mixed $value, if $value is not null
+ */
+ private function failOnNull( $value, $name ) {
+ if ( $value === null ) {
+ throw new IncompleteRevisionException(
+ "$name must not be " . var_export( $value, true ) . "!"
+ );
+ }
+
+ return $value;
+ }
+
+ /**
+ * @param mixed $value
+ * @param string $name
+ *
+ * @throws IncompleteRevisionException if $value is empty
+ * @return mixed $value, if $value is not null
+ */
+ private function failOnEmpty( $value, $name ) {
+ if ( $value === null || $value === 0 || $value === '' ) {
+ throw new IncompleteRevisionException(
+ "$name must not be " . var_export( $value, true ) . "!"
+ );
+ }
+
+ return $value;
+ }
+
+ /**
+ * Insert a new revision into the database, returning the new revision record
+ * on success and dies horribly on failure.
+ *
+ * MCR migration note: this replaces Revision::insertOn
+ *
+ * @param RevisionRecord $rev
+ * @param IDatabase $dbw (master connection)
+ *
+ * @throws InvalidArgumentException
+ * @return RevisionRecord the new revision record.
+ */
+ public function insertRevisionOn( RevisionRecord $rev, IDatabase $dbw ) {
+ // TODO: pass in a DBTransactionContext instead of a database connection.
+ $this->checkDatabaseWikiId( $dbw );
+
+ $slotRoles = $rev->getSlotRoles();
+
+ // Make sure the main slot is always provided throughout migration
+ if ( !in_array( SlotRecord::MAIN, $slotRoles ) ) {
+ throw new InvalidArgumentException(
+ 'main slot must be provided'
+ );
+ }
+
+ // If we are not writing into the new schema, we can't support extra slots.
+ if ( !$this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_NEW )
+ && $slotRoles !== [ SlotRecord::MAIN ]
+ ) {
+ throw new InvalidArgumentException(
+ 'Only the main slot is supported when not writing to the MCR enabled schema!'
+ );
+ }
+
+ // As long as we are not reading from the new schema, we don't want to write extra slots.
+ if ( !$this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_NEW )
+ && $slotRoles !== [ SlotRecord::MAIN ]
+ ) {
+ throw new InvalidArgumentException(
+ 'Only the main slot is supported when not reading from the MCR enabled schema!'
+ );
+ }
+
+ // Checks
+ $this->failOnNull( $rev->getSize(), 'size field' );
+ $this->failOnEmpty( $rev->getSha1(), 'sha1 field' );
+ $this->failOnEmpty( $rev->getTimestamp(), 'timestamp field' );
+ $comment = $this->failOnNull( $rev->getComment( RevisionRecord::RAW ), 'comment' );
+ $user = $this->failOnNull( $rev->getUser( RevisionRecord::RAW ), 'user' );
+ $this->failOnNull( $user->getId(), 'user field' );
+ $this->failOnEmpty( $user->getName(), 'user_text field' );
+
+ if ( !$rev->isReadyForInsertion() ) {
+ // This is here for future-proofing. At the time this check being added, it
+ // was redundant to the individual checks above.
+ throw new IncompleteRevisionException( 'Revision is incomplete' );
+ }
+
+ // TODO: we shouldn't need an actual Title here.
+ $title = Title::newFromLinkTarget( $rev->getPageAsLinkTarget() );
+ $pageId = $this->failOnEmpty( $rev->getPageId(), 'rev_page field' ); // check this early
+
+ $parentId = $rev->getParentId() === null
+ ? $this->getPreviousRevisionId( $dbw, $rev )
+ : $rev->getParentId();
+
+ /** @var RevisionRecord $rev */
+ $rev = $dbw->doAtomicSection(
+ __METHOD__,
+ function ( IDatabase $dbw, $fname ) use (
+ $rev,
+ $user,
+ $comment,
+ $title,
+ $pageId,
+ $parentId
+ ) {
+ return $this->insertRevisionInternal(
+ $rev,
+ $dbw,
+ $user,
+ $comment,
+ $title,
+ $pageId,
+ $parentId
+ );
+ }
+ );
+
+ // sanity checks
+ Assert::postcondition( $rev->getId() > 0, 'revision must have an ID' );
+ Assert::postcondition( $rev->getPageId() > 0, 'revision must have a page ID' );
+ Assert::postcondition(
+ $rev->getComment( RevisionRecord::RAW ) !== null,
+ 'revision must have a comment'
+ );
+ Assert::postcondition(
+ $rev->getUser( RevisionRecord::RAW ) !== null,
+ 'revision must have a user'
+ );
+
+ // Trigger exception if the main slot is missing.
+ // Technically, this could go away after MCR migration: while
+ // calling code may require a main slot to exist, RevisionStore
+ // really should not know or care about that requirement.
+ $rev->getSlot( SlotRecord::MAIN, RevisionRecord::RAW );
+
+ foreach ( $slotRoles as $role ) {
+ $slot = $rev->getSlot( $role, RevisionRecord::RAW );
+ Assert::postcondition(
+ $slot->getContent() !== null,
+ $role . ' slot must have content'
+ );
+ Assert::postcondition(
+ $slot->hasRevision(),
+ $role . ' slot must have a revision associated'
+ );
+ }
+
+ Hooks::run( 'RevisionRecordInserted', [ $rev ] );
+
+ // TODO: deprecate in 1.32!
+ $legacyRevision = new Revision( $rev );
+ Hooks::run( 'RevisionInsertComplete', [ &$legacyRevision, null, null ] );
+
+ return $rev;
+ }
+
+ private function insertRevisionInternal(
+ RevisionRecord $rev,
+ IDatabase $dbw,
+ User $user,
+ CommentStoreComment $comment,
+ Title $title,
+ $pageId,
+ $parentId
+ ) {
+ $slotRoles = $rev->getSlotRoles();
+
+ $revisionRow = $this->insertRevisionRowOn(
+ $dbw,
+ $rev,
+ $title,
+ $parentId
+ );
+
+ $revisionId = $revisionRow['rev_id'];
+
+ $blobHints = [
+ BlobStore::PAGE_HINT => $pageId,
+ BlobStore::REVISION_HINT => $revisionId,
+ BlobStore::PARENT_HINT => $parentId,
+ ];
+
+ $newSlots = [];
+ foreach ( $slotRoles as $role ) {
+ $slot = $rev->getSlot( $role, RevisionRecord::RAW );
+
+ // If the SlotRecord already has a revision ID set, this means it already exists
+ // in the database, and should already belong to the current revision.
+ // However, a slot may already have a revision, but no content ID, if the slot
+ // is emulated based on the archive table, because we are in SCHEMA_COMPAT_READ_OLD
+ // mode, and the respective archive row was not yet migrated to the new schema.
+ // In that case, a new slot row (and content row) must be inserted even during
+ // undeletion.
+ if ( $slot->hasRevision() && $slot->hasContentId() ) {
+ // TODO: properly abort transaction if the assertion fails!
+ Assert::parameter(
+ $slot->getRevision() === $revisionId,
+ 'slot role ' . $slot->getRole(),
+ 'Existing slot should belong to revision '
+ . $revisionId . ', but belongs to revision ' . $slot->getRevision() . '!'
+ );
+
+ // Slot exists, nothing to do, move along.
+ // This happens when restoring archived revisions.
+
+ $newSlots[$role] = $slot;
+
+ // Write the main slot's text ID to the revision table for backwards compatibility
+ if ( $slot->getRole() === SlotRecord::MAIN
+ && $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_OLD )
+ ) {
+ $blobAddress = $slot->getAddress();
+ $this->updateRevisionTextId( $dbw, $revisionId, $blobAddress );
+ }
+ } else {
+ $newSlots[$role] = $this->insertSlotOn( $dbw, $revisionId, $slot, $title, $blobHints );
+ }
+ }
+
+ $this->insertIpChangesRow( $dbw, $user, $rev, $revisionId );
+
+ $rev = new RevisionStoreRecord(
+ $title,
+ $user,
+ $comment,
+ (object)$revisionRow,
+ new RevisionSlots( $newSlots ),
+ $this->wikiId
+ );
+
+ return $rev;
+ }
+
+ /**
+ * @param IDatabase $dbw
+ * @param int $revisionId
+ * @param string &$blobAddress (may change!)
+ *
+ * @return int the text row id
+ */
+ private function updateRevisionTextId( IDatabase $dbw, $revisionId, &$blobAddress ) {
+ $textId = $this->blobStore->getTextIdFromAddress( $blobAddress );
+ if ( !$textId ) {
+ throw new LogicException(
+ 'Blob address not supported in 1.29 database schema: ' . $blobAddress
+ );
+ }
+
+ // getTextIdFromAddress() is free to insert something into the text table, so $textId
+ // may be a new value, not anything already contained in $blobAddress.
+ $blobAddress = SqlBlobStore::makeAddressFromTextId( $textId );
+
+ $dbw->update(
+ 'revision',
+ [ 'rev_text_id' => $textId ],
+ [ 'rev_id' => $revisionId ],
+ __METHOD__
+ );
+
+ return $textId;
+ }
+
+ /**
+ * @param IDatabase $dbw
+ * @param int $revisionId
+ * @param SlotRecord $protoSlot
+ * @param Title $title
+ * @param array $blobHints See the BlobStore::XXX_HINT constants
+ * @return SlotRecord
+ */
+ private function insertSlotOn(
+ IDatabase $dbw,
+ $revisionId,
+ SlotRecord $protoSlot,
+ Title $title,
+ array $blobHints = []
+ ) {
+ if ( $protoSlot->hasAddress() ) {
+ $blobAddress = $protoSlot->getAddress();
+ } else {
+ $blobAddress = $this->storeContentBlob( $protoSlot, $title, $blobHints );
+ }
+
+ $contentId = null;
+
+ // Write the main slot's text ID to the revision table for backwards compatibility
+ if ( $protoSlot->getRole() === SlotRecord::MAIN
+ && $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_OLD )
+ ) {
+ // If SCHEMA_COMPAT_WRITE_NEW is also set, the fake content ID is overwritten
+ // with the real content ID below.
+ $textId = $this->updateRevisionTextId( $dbw, $revisionId, $blobAddress );
+ $contentId = $this->emulateContentId( $textId );
+ }
+
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_NEW ) ) {
+ if ( $protoSlot->hasContentId() ) {
+ $contentId = $protoSlot->getContentId();
+ } else {
+ $contentId = $this->insertContentRowOn( $protoSlot, $dbw, $blobAddress );
+ }
+
+ $this->insertSlotRowOn( $protoSlot, $dbw, $revisionId, $contentId );
+ }
+
+ $savedSlot = SlotRecord::newSaved(
+ $revisionId,
+ $contentId,
+ $blobAddress,
+ $protoSlot
+ );
+
+ return $savedSlot;
+ }
+
+ /**
+ * Insert IP revision into ip_changes for use when querying for a range.
+ * @param IDatabase $dbw
+ * @param User $user
+ * @param RevisionRecord $rev
+ * @param int $revisionId
+ */
+ private function insertIpChangesRow(
+ IDatabase $dbw,
+ User $user,
+ RevisionRecord $rev,
+ $revisionId
+ ) {
+ if ( $user->getId() === 0 && IP::isValid( $user->getName() ) ) {
+ $ipcRow = [
+ 'ipc_rev_id' => $revisionId,
+ 'ipc_rev_timestamp' => $dbw->timestamp( $rev->getTimestamp() ),
+ 'ipc_hex' => IP::toHex( $user->getName() ),
+ ];
+ $dbw->insert( 'ip_changes', $ipcRow, __METHOD__ );
+ }
+ }
+
+ /**
+ * @param IDatabase $dbw
+ * @param RevisionRecord $rev
+ * @param Title $title
+ * @param int $parentId
+ *
+ * @return array a revision table row
+ *
+ * @throws MWException
+ * @throws MWUnknownContentModelException
+ */
+ private function insertRevisionRowOn(
+ IDatabase $dbw,
+ RevisionRecord $rev,
+ Title $title,
+ $parentId
+ ) {
+ $revisionRow = $this->getBaseRevisionRow( $dbw, $rev, $title, $parentId );
+
+ list( $commentFields, $commentCallback ) =
+ $this->commentStore->insertWithTempTable(
+ $dbw,
+ 'rev_comment',
+ $rev->getComment( RevisionRecord::RAW )
+ );
+ $revisionRow += $commentFields;
+
+ list( $actorFields, $actorCallback ) =
+ $this->actorMigration->getInsertValuesWithTempTable(
+ $dbw,
+ 'rev_user',
+ $rev->getUser( RevisionRecord::RAW )
+ );
+ $revisionRow += $actorFields;
+
+ $dbw->insert( 'revision', $revisionRow, __METHOD__ );
+
+ if ( !isset( $revisionRow['rev_id'] ) ) {
+ // only if auto-increment was used
+ $revisionRow['rev_id'] = intval( $dbw->insertId() );
+
+ if ( $dbw->getType() === 'mysql' ) {
+ // (T202032) MySQL until 8.0 and MariaDB until some version after 10.1.34 don't save the
+ // auto-increment value to disk, so on server restart it might reuse IDs from deleted
+ // revisions. We can fix that with an insert with an explicit rev_id value, if necessary.
+
+ $maxRevId = intval( $dbw->selectField( 'archive', 'MAX(ar_rev_id)', '', __METHOD__ ) );
+ $table = 'archive';
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_NEW ) ) {
+ $maxRevId2 = intval( $dbw->selectField( 'slots', 'MAX(slot_revision_id)', '', __METHOD__ ) );
+ if ( $maxRevId2 >= $maxRevId ) {
+ $maxRevId = $maxRevId2;
+ $table = 'slots';
+ }
+ }
+
+ if ( $maxRevId >= $revisionRow['rev_id'] ) {
+ $this->logger->debug(
+ '__METHOD__: Inserted revision {revid} but {table} has revisions up to {maxrevid}.'
+ . ' Trying to fix it.',
+ [
+ 'revid' => $revisionRow['rev_id'],
+ 'table' => $table,
+ 'maxrevid' => $maxRevId,
+ ]
+ );
+
+ if ( !$dbw->lock( 'fix-for-T202032', __METHOD__ ) ) {
+ throw new MWException( 'Failed to get database lock for T202032' );
+ }
+ $fname = __METHOD__;
+ $dbw->onTransactionResolution( function ( $trigger, $dbw ) use ( $fname ) {
+ $dbw->unlock( 'fix-for-T202032', $fname );
+ } );
+
+ $dbw->delete( 'revision', [ 'rev_id' => $revisionRow['rev_id'] ], __METHOD__ );
+
+ // The locking here is mostly to make MySQL bypass the REPEATABLE-READ transaction
+ // isolation (weird MySQL "feature"). It does seem to block concurrent auto-incrementing
+ // inserts too, though, at least on MariaDB 10.1.29.
+ //
+ // Don't try to lock `revision` in this way, it'll deadlock if there are concurrent
+ // transactions in this code path thanks to the row lock from the original ->insert() above.
+ //
+ // And we have to use raw SQL to bypass the "aggregation used with a locking SELECT" warning
+ // that's for non-MySQL DBs.
+ $row1 = $dbw->query(
+ $dbw->selectSqlText( 'archive', [ 'v' => "MAX(ar_rev_id)" ], '', __METHOD__ ) . ' FOR UPDATE'
+ )->fetchObject();
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_NEW ) ) {
+ $row2 = $dbw->query(
+ $dbw->selectSqlText( 'slots', [ 'v' => "MAX(slot_revision_id)" ], '', __METHOD__ )
+ . ' FOR UPDATE'
+ )->fetchObject();
+ } else {
+ $row2 = null;
+ }
+ $maxRevId = max(
+ $maxRevId,
+ $row1 ? intval( $row1->v ) : 0,
+ $row2 ? intval( $row2->v ) : 0
+ );
+
+ // If we don't have SCHEMA_COMPAT_WRITE_NEW, all except the first of any concurrent
+ // transactions will throw a duplicate key error here. It doesn't seem worth trying
+ // to avoid that.
+ $revisionRow['rev_id'] = $maxRevId + 1;
+ $dbw->insert( 'revision', $revisionRow, __METHOD__ );
+ }
+ }
+ }
+
+ $commentCallback( $revisionRow['rev_id'] );
+ $actorCallback( $revisionRow['rev_id'], $revisionRow );
+
+ return $revisionRow;
+ }
+
+ /**
+ * @param IDatabase $dbw
+ * @param RevisionRecord $rev
+ * @param Title $title
+ * @param int $parentId
+ *
+ * @return array [ 0 => array $revisionRow, 1 => callable ]
+ * @throws MWException
+ * @throws MWUnknownContentModelException
+ */
+ private function getBaseRevisionRow(
+ IDatabase $dbw,
+ RevisionRecord $rev,
+ Title $title,
+ $parentId
+ ) {
+ // Record the edit in revisions
+ $revisionRow = [
+ 'rev_page' => $rev->getPageId(),
+ 'rev_parent_id' => $parentId,
+ 'rev_minor_edit' => $rev->isMinor() ? 1 : 0,
+ 'rev_timestamp' => $dbw->timestamp( $rev->getTimestamp() ),
+ 'rev_deleted' => $rev->getVisibility(),
+ 'rev_len' => $rev->getSize(),
+ 'rev_sha1' => $rev->getSha1(),
+ ];
+
+ if ( $rev->getId() !== null ) {
+ // Needed to restore revisions with their original ID
+ $revisionRow['rev_id'] = $rev->getId();
+ }
+
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_OLD ) ) {
+ // In non MCR mode this IF section will relate to the main slot
+ $mainSlot = $rev->getSlot( SlotRecord::MAIN );
+ $model = $mainSlot->getModel();
+ $format = $mainSlot->getFormat();
+
+ // MCR migration note: rev_content_model and rev_content_format will go away
+ if ( $this->contentHandlerUseDB ) {
+ $this->assertCrossWikiContentLoadingIsSafe();
+
+ $defaultModel = ContentHandler::getDefaultModelFor( $title );
+ $defaultFormat = ContentHandler::getForModelID( $defaultModel )->getDefaultFormat();
+
+ $revisionRow['rev_content_model'] = ( $model === $defaultModel ) ? null : $model;
+ $revisionRow['rev_content_format'] = ( $format === $defaultFormat ) ? null : $format;
+ }
+ }
+
+ return $revisionRow;
+ }
+
+ /**
+ * @param SlotRecord $slot
+ * @param Title $title
+ * @param array $blobHints See the BlobStore::XXX_HINT constants
+ *
+ * @throws MWException
+ * @return string the blob address
+ */
+ private function storeContentBlob(
+ SlotRecord $slot,
+ Title $title,
+ array $blobHints = []
+ ) {
+ $content = $slot->getContent();
+ $format = $content->getDefaultFormat();
+ $model = $content->getModel();
+
+ $this->checkContent( $content, $title );
+
+ return $this->blobStore->storeBlob(
+ $content->serialize( $format ),
+ // These hints "leak" some information from the higher abstraction layer to
+ // low level storage to allow for optimization.
+ array_merge(
+ $blobHints,
+ [
+ BlobStore::DESIGNATION_HINT => 'page-content',
+ BlobStore::ROLE_HINT => $slot->getRole(),
+ BlobStore::SHA1_HINT => $slot->getSha1(),
+ BlobStore::MODEL_HINT => $model,
+ BlobStore::FORMAT_HINT => $format,
+ ]
+ )
+ );
+ }
+
+ /**
+ * @param SlotRecord $slot
+ * @param IDatabase $dbw
+ * @param int $revisionId
+ * @param int $contentId
+ */
+ private function insertSlotRowOn( SlotRecord $slot, IDatabase $dbw, $revisionId, $contentId ) {
+ $slotRow = [
+ 'slot_revision_id' => $revisionId,
+ 'slot_role_id' => $this->slotRoleStore->acquireId( $slot->getRole() ),
+ 'slot_content_id' => $contentId,
+ // If the slot has a specific origin use that ID, otherwise use the ID of the revision
+ // that we just inserted.
+ 'slot_origin' => $slot->hasOrigin() ? $slot->getOrigin() : $revisionId,
+ ];
+ $dbw->insert( 'slots', $slotRow, __METHOD__ );
+ }
+
+ /**
+ * @param SlotRecord $slot
+ * @param IDatabase $dbw
+ * @param string $blobAddress
+ * @return int content row ID
+ */
+ private function insertContentRowOn( SlotRecord $slot, IDatabase $dbw, $blobAddress ) {
+ $contentRow = [
+ 'content_size' => $slot->getSize(),
+ 'content_sha1' => $slot->getSha1(),
+ 'content_model' => $this->contentModelStore->acquireId( $slot->getModel() ),
+ 'content_address' => $blobAddress,
+ ];
+ $dbw->insert( 'content', $contentRow, __METHOD__ );
+ return intval( $dbw->insertId() );
+ }
+
+ /**
+ * MCR migration note: this corresponds to Revision::checkContentModel
+ *
+ * @param Content $content
+ * @param Title $title
+ *
+ * @throws MWException
+ * @throws MWUnknownContentModelException
+ */
+ private function checkContent( Content $content, Title $title ) {
+ // Note: may return null for revisions that have not yet been inserted
+
+ $model = $content->getModel();
+ $format = $content->getDefaultFormat();
+ $handler = $content->getContentHandler();
+
+ $name = "$title";
+
+ if ( !$handler->isSupportedFormat( $format ) ) {
+ throw new MWException( "Can't use format $format with content model $model on $name" );
+ }
+
+ if ( !$this->contentHandlerUseDB ) {
+ // if $wgContentHandlerUseDB is not set,
+ // all revisions must use the default content model and format.
+
+ $this->assertCrossWikiContentLoadingIsSafe();
+
+ $defaultModel = ContentHandler::getDefaultModelFor( $title );
+ $defaultHandler = ContentHandler::getForModelID( $defaultModel );
+ $defaultFormat = $defaultHandler->getDefaultFormat();
+
+ if ( $model != $defaultModel ) {
+ throw new MWException( "Can't save non-default content model with "
+ . "\$wgContentHandlerUseDB disabled: model is $model, "
+ . "default for $name is $defaultModel"
+ );
+ }
+
+ if ( $format != $defaultFormat ) {
+ throw new MWException( "Can't use non-default content format with "
+ . "\$wgContentHandlerUseDB disabled: format is $format, "
+ . "default for $name is $defaultFormat"
+ );
+ }
+ }
+
+ if ( !$content->isValid() ) {
+ throw new MWException(
+ "New content for $name is not valid! Content model is $model"
+ );
+ }
+ }
+
+ /**
+ * Create a new null-revision for insertion into a page's
+ * history. This will not re-save the text, but simply refer
+ * to the text from the previous version.
+ *
+ * Such revisions can for instance identify page rename
+ * operations and other such meta-modifications.
+ *
+ * @note This method grabs a FOR UPDATE lock on the relevant row of the page table,
+ * to prevent a new revision from being inserted before the null revision has been written
+ * to the database.
+ *
+ * MCR migration note: this replaces Revision::newNullRevision
+ *
+ * @todo Introduce newFromParentRevision(). newNullRevision can then be based on that
+ * (or go away).
+ *
+ * @param IDatabase $dbw used for obtaining the lock on the page table row
+ * @param Title $title Title of the page to read from
+ * @param CommentStoreComment $comment RevisionRecord's summary
+ * @param bool $minor Whether the revision should be considered as minor
+ * @param User $user The user to attribute the revision to
+ *
+ * @return RevisionRecord|null RevisionRecord or null on error
+ */
+ public function newNullRevision(
+ IDatabase $dbw,
+ Title $title,
+ CommentStoreComment $comment,
+ $minor,
+ User $user
+ ) {
+ $this->checkDatabaseWikiId( $dbw );
+
+ $pageId = $title->getArticleID();
+
+ // T51581: Lock the page table row to ensure no other process
+ // is adding a revision to the page at the same time.
+ // Avoid locking extra tables, compare T191892.
+ $pageLatest = $dbw->selectField(
+ 'page',
+ 'page_latest',
+ [ 'page_id' => $pageId ],
+ __METHOD__,
+ [ 'FOR UPDATE' ]
+ );
+
+ if ( !$pageLatest ) {
+ return null;
+ }
+
+ // Fetch the actual revision row from master, without locking all extra tables.
+ $oldRevision = $this->loadRevisionFromConds(
+ $dbw,
+ [ 'rev_id' => intval( $pageLatest ) ],
+ self::READ_LATEST,
+ $title
+ );
+
+ if ( !$oldRevision ) {
+ $msg = "Failed to load latest revision ID $pageLatest of page ID $pageId.";
+ $this->logger->error(
+ $msg,
+ [ 'exception' => new RuntimeException( $msg ) ]
+ );
+ return null;
+ }
+
+ // Construct the new revision
+ $timestamp = wfTimestampNow(); // TODO: use a callback, so we can override it for testing.
+ $newRevision = MutableRevisionRecord::newFromParentRevision( $oldRevision );
+
+ $newRevision->setComment( $comment );
+ $newRevision->setUser( $user );
+ $newRevision->setTimestamp( $timestamp );
+ $newRevision->setMinorEdit( $minor );
+
+ return $newRevision;
+ }
+
+ /**
+ * MCR migration note: this replaces Revision::isUnpatrolled
+ *
+ * @todo This is overly specific, so move or kill this method.
+ *
+ * @param RevisionRecord $rev
+ *
+ * @return int Rcid of the unpatrolled row, zero if there isn't one
+ */
+ public function getRcIdIfUnpatrolled( RevisionRecord $rev ) {
+ $rc = $this->getRecentChange( $rev );
+ if ( $rc && $rc->getAttribute( 'rc_patrolled' ) == RecentChange::PRC_UNPATROLLED ) {
+ return $rc->getAttribute( 'rc_id' );
+ } else {
+ return 0;
+ }
+ }
+
+ /**
+ * Get the RC object belonging to the current revision, if there's one
+ *
+ * MCR migration note: this replaces Revision::getRecentChange
+ *
+ * @todo move this somewhere else?
+ *
+ * @param RevisionRecord $rev
+ * @param int $flags (optional) $flags include:
+ * IDBAccessObject::READ_LATEST: Select the data from the master
+ *
+ * @return null|RecentChange
+ */
+ public function getRecentChange( RevisionRecord $rev, $flags = 0 ) {
+ list( $dbType, ) = DBAccessObjectUtils::getDBOptions( $flags );
+ $db = $this->getDBConnection( $dbType );
+
+ $userIdentity = $rev->getUser( RevisionRecord::RAW );
+
+ if ( !$userIdentity ) {
+ // If the revision has no user identity, chances are it never went
+ // into the database, and doesn't have an RC entry.
+ return null;
+ }
+
+ // TODO: Select by rc_this_oldid alone - but as of Nov 2017, there is no index on that!
+ $actorWhere = $this->actorMigration->getWhere( $db, 'rc_user', $rev->getUser(), false );
+ $rc = RecentChange::newFromConds(
+ [
+ $actorWhere['conds'],
+ 'rc_timestamp' => $db->timestamp( $rev->getTimestamp() ),
+ 'rc_this_oldid' => $rev->getId()
+ ],
+ __METHOD__,
+ $dbType
+ );
+
+ $this->releaseDBConnection( $db );
+
+ // XXX: cache this locally? Glue it to the RevisionRecord?
+ return $rc;
+ }
+
+ /**
+ * Maps fields of the archive row to corresponding revision rows.
+ *
+ * @param object $archiveRow
+ *
+ * @return object a revision row object, corresponding to $archiveRow.
+ */
+ private static function mapArchiveFields( $archiveRow ) {
+ $fieldMap = [
+ // keep with ar prefix:
+ 'ar_id' => 'ar_id',
+
+ // not the same suffix:
+ 'ar_page_id' => 'rev_page',
+ 'ar_rev_id' => 'rev_id',
+
+ // same suffix:
+ 'ar_text_id' => 'rev_text_id',
+ 'ar_timestamp' => 'rev_timestamp',
+ 'ar_user_text' => 'rev_user_text',
+ 'ar_user' => 'rev_user',
+ 'ar_actor' => 'rev_actor',
+ 'ar_minor_edit' => 'rev_minor_edit',
+ 'ar_deleted' => 'rev_deleted',
+ 'ar_len' => 'rev_len',
+ 'ar_parent_id' => 'rev_parent_id',
+ 'ar_sha1' => 'rev_sha1',
+ 'ar_comment' => 'rev_comment',
+ 'ar_comment_cid' => 'rev_comment_cid',
+ 'ar_comment_id' => 'rev_comment_id',
+ 'ar_comment_text' => 'rev_comment_text',
+ 'ar_comment_data' => 'rev_comment_data',
+ 'ar_comment_old' => 'rev_comment_old',
+ 'ar_content_format' => 'rev_content_format',
+ 'ar_content_model' => 'rev_content_model',
+ ];
+
+ $revRow = new stdClass();
+ foreach ( $fieldMap as $arKey => $revKey ) {
+ if ( property_exists( $archiveRow, $arKey ) ) {
+ $revRow->$revKey = $archiveRow->$arKey;
+ }
+ }
+
+ return $revRow;
+ }
+
+ /**
+ * Constructs a RevisionRecord for the revisions main slot, based on the MW1.29 schema.
+ *
+ * @param object|array $row Either a database row or an array
+ * @param int $queryFlags for callbacks
+ * @param Title $title
+ *
+ * @return SlotRecord The main slot, extracted from the MW 1.29 style row.
+ * @throws MWException
+ */
+ private function emulateMainSlot_1_29( $row, $queryFlags, Title $title ) {
+ $mainSlotRow = new stdClass();
+ $mainSlotRow->role_name = SlotRecord::MAIN;
+ $mainSlotRow->model_name = null;
+ $mainSlotRow->slot_revision_id = null;
+ $mainSlotRow->slot_content_id = null;
+ $mainSlotRow->content_address = null;
+
+ $content = null;
+ $blobData = null;
+ $blobFlags = null;
+
+ if ( is_object( $row ) ) {
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_NEW ) ) {
+ // Don't emulate from a row when using the new schema.
+ // Emulating from an array is still OK.
+ throw new LogicException( 'Can\'t emulate the main slot when using MCR schema.' );
+ }
+
+ // archive row
+ if ( !isset( $row->rev_id ) && ( isset( $row->ar_user ) || isset( $row->ar_actor ) ) ) {
+ $row = $this->mapArchiveFields( $row );
+ }
+
+ if ( isset( $row->rev_text_id ) && $row->rev_text_id > 0 ) {
+ $mainSlotRow->content_address = SqlBlobStore::makeAddressFromTextId(
+ $row->rev_text_id
+ );
+ }
+
+ // This is used by null-revisions
+ $mainSlotRow->slot_origin = isset( $row->slot_origin )
+ ? intval( $row->slot_origin )
+ : null;
+
+ if ( isset( $row->old_text ) ) {
+ // this happens when the text-table gets joined directly, in the pre-1.30 schema
+ $blobData = isset( $row->old_text ) ? strval( $row->old_text ) : null;
+ // Check against selects that might have not included old_flags
+ if ( !property_exists( $row, 'old_flags' ) ) {
+ throw new InvalidArgumentException( 'old_flags was not set in $row' );
+ }
+ $blobFlags = $row->old_flags ?? '';
+ }
+
+ $mainSlotRow->slot_revision_id = intval( $row->rev_id );
+
+ $mainSlotRow->content_size = isset( $row->rev_len ) ? intval( $row->rev_len ) : null;
+ $mainSlotRow->content_sha1 = isset( $row->rev_sha1 ) ? strval( $row->rev_sha1 ) : null;
+ $mainSlotRow->model_name = isset( $row->rev_content_model )
+ ? strval( $row->rev_content_model )
+ : null;
+ // XXX: in the future, we'll probably always use the default format, and drop content_format
+ $mainSlotRow->format_name = isset( $row->rev_content_format )
+ ? strval( $row->rev_content_format )
+ : null;
+
+ if ( isset( $row->rev_text_id ) && intval( $row->rev_text_id ) > 0 ) {
+ // Overwritten below for SCHEMA_COMPAT_WRITE_NEW
+ $mainSlotRow->slot_content_id
+ = $this->emulateContentId( intval( $row->rev_text_id ) );
+ }
+ } elseif ( is_array( $row ) ) {
+ $mainSlotRow->slot_revision_id = isset( $row['id'] ) ? intval( $row['id'] ) : null;
+
+ $mainSlotRow->slot_origin = isset( $row['slot_origin'] )
+ ? intval( $row['slot_origin'] )
+ : null;
+ $mainSlotRow->content_address = isset( $row['text_id'] )
+ ? SqlBlobStore::makeAddressFromTextId( intval( $row['text_id'] ) )
+ : null;
+ $mainSlotRow->content_size = isset( $row['len'] ) ? intval( $row['len'] ) : null;
+ $mainSlotRow->content_sha1 = isset( $row['sha1'] ) ? strval( $row['sha1'] ) : null;
+
+ $mainSlotRow->model_name = isset( $row['content_model'] )
+ ? strval( $row['content_model'] ) : null; // XXX: must be a string!
+ // XXX: in the future, we'll probably always use the default format, and drop content_format
+ $mainSlotRow->format_name = isset( $row['content_format'] )
+ ? strval( $row['content_format'] ) : null;
+ $blobData = isset( $row['text'] ) ? rtrim( strval( $row['text'] ) ) : null;
+ // XXX: If the flags field is not set then $blobFlags should be null so that no
+ // decoding will happen. An empty string will result in default decodings.
+ $blobFlags = isset( $row['flags'] ) ? trim( strval( $row['flags'] ) ) : null;
+
+ // if we have a Content object, override mText and mContentModel
+ if ( !empty( $row['content'] ) ) {
+ if ( !( $row['content'] instanceof Content ) ) {
+ throw new MWException( 'content field must contain a Content object.' );
+ }
+
+ /** @var Content $content */
+ $content = $row['content'];
+ $handler = $content->getContentHandler();
+
+ $mainSlotRow->model_name = $content->getModel();
+
+ // XXX: in the future, we'll probably always use the default format.
+ if ( $mainSlotRow->format_name === null ) {
+ $mainSlotRow->format_name = $handler->getDefaultFormat();
+ }
+ }
+
+ if ( isset( $row['text_id'] ) && intval( $row['text_id'] ) > 0 ) {
+ // Overwritten below for SCHEMA_COMPAT_WRITE_NEW
+ $mainSlotRow->slot_content_id
+ = $this->emulateContentId( intval( $row['text_id'] ) );
+ }
+ } else {
+ throw new MWException( 'Revision constructor passed invalid row format.' );
+ }
+
+ // With the old schema, the content changes with every revision,
+ // except for null-revisions.
+ if ( !isset( $mainSlotRow->slot_origin ) ) {
+ $mainSlotRow->slot_origin = $mainSlotRow->slot_revision_id;
+ }
+
+ if ( $mainSlotRow->model_name === null ) {
+ $mainSlotRow->model_name = function ( SlotRecord $slot ) use ( $title ) {
+ $this->assertCrossWikiContentLoadingIsSafe();
+
+ // TODO: MCR: consider slot role in getDefaultModelFor()! Use LinkTarget!
+ // TODO: MCR: deprecate $title->getModel().
+ return ContentHandler::getDefaultModelFor( $title );
+ };
+ }
+
+ if ( !$content ) {
+ // XXX: We should perhaps fail if $blobData is null and $mainSlotRow->content_address
+ // is missing, but "empty revisions" with no content are used in some edge cases.
+
+ $content = function ( SlotRecord $slot )
+ use ( $blobData, $blobFlags, $queryFlags, $mainSlotRow )
+ {
+ return $this->loadSlotContent(
+ $slot,
+ $blobData,
+ $blobFlags,
+ $mainSlotRow->format_name,
+ $queryFlags
+ );
+ };
+ }
+
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_NEW ) ) {
+ // NOTE: this callback will be looped through RevisionSlot::newInherited(), allowing
+ // the inherited slot to have the same content_id as the original slot. In that case,
+ // $slot will be the inherited slot, while $mainSlotRow still refers to the original slot.
+ $mainSlotRow->slot_content_id =
+ function ( SlotRecord $slot ) use ( $queryFlags, $mainSlotRow ) {
+ $db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
+ return $this->findSlotContentId( $db, $mainSlotRow->slot_revision_id, SlotRecord::MAIN );
+ };
+ }
+
+ return new SlotRecord( $mainSlotRow, $content );
+ }
+
+ /**
+ * Provides a content ID to use with emulated SlotRecords in SCHEMA_COMPAT_OLD mode,
+ * based on the revision's text ID (rev_text_id or ar_text_id, respectively).
+ * Note that in SCHEMA_COMPAT_WRITE_BOTH, a callback to findSlotContentId() should be used
+ * instead, since in that mode, some revision rows may already have a real content ID,
+ * while other's don't - and for the ones that don't, we should indicate that it
+ * is missing and cause SlotRecords::hasContentId() to return false.
+ *
+ * @param int $textId
+ * @return int The emulated content ID
+ */
+ private function emulateContentId( $textId ) {
+ // Return a negative number to ensure the ID is distinct from any real content IDs
+ // that will be assigned in SCHEMA_COMPAT_WRITE_NEW mode and read in SCHEMA_COMPAT_READ_NEW
+ // mode.
+ return -$textId;
+ }
+
+ /**
+ * Loads a Content object based on a slot row.
+ *
+ * This method does not call $slot->getContent(), and may be used as a callback
+ * called by $slot->getContent().
+ *
+ * MCR migration note: this roughly corresponds to Revision::getContentInternal
+ *
+ * @param SlotRecord $slot The SlotRecord to load content for
+ * @param string|null $blobData The content blob, in the form indicated by $blobFlags
+ * @param string|null $blobFlags Flags indicating how $blobData needs to be processed.
+ * Use null if no processing should happen. That is in constrast to the empty string,
+ * which causes the blob to be decoded according to the configured legacy encoding.
+ * @param string|null $blobFormat MIME type indicating how $dataBlob is encoded
+ * @param int $queryFlags
+ *
+ * @throws RevisionAccessException
+ * @return Content
+ */
+ private function loadSlotContent(
+ SlotRecord $slot,
+ $blobData = null,
+ $blobFlags = null,
+ $blobFormat = null,
+ $queryFlags = 0
+ ) {
+ if ( $blobData !== null ) {
+ Assert::parameterType( 'string', $blobData, '$blobData' );
+ Assert::parameterType( 'string|null', $blobFlags, '$blobFlags' );
+
+ $cacheKey = $slot->hasAddress() ? $slot->getAddress() : null;
+
+ if ( $blobFlags === null ) {
+ // No blob flags, so use the blob verbatim.
+ $data = $blobData;
+ } else {
+ $data = $this->blobStore->expandBlob( $blobData, $blobFlags, $cacheKey );
+ if ( $data === false ) {
+ throw new RevisionAccessException(
+ "Failed to expand blob data using flags $blobFlags (key: $cacheKey)"
+ );
+ }
+ }
+
+ } else {
+ $address = $slot->getAddress();
+ try {
+ $data = $this->blobStore->getBlob( $address, $queryFlags );
+ } catch ( BlobAccessException $e ) {
+ throw new RevisionAccessException(
+ "Failed to load data blob from $address: " . $e->getMessage(), 0, $e
+ );
+ }
+ }
+
+ // Unserialize content
+ $handler = ContentHandler::getForModelID( $slot->getModel() );
+
+ $content = $handler->unserializeContent( $data, $blobFormat );
+ return $content;
+ }
+
+ /**
+ * Load a page revision from a given revision ID number.
+ * Returns null if no such revision can be found.
+ *
+ * MCR migration note: this replaces Revision::newFromId
+ *
+ * $flags include:
+ * IDBAccessObject::READ_LATEST: Select the data from the master
+ * IDBAccessObject::READ_LOCKING : Select & lock the data from the master
+ *
+ * @param int $id
+ * @param int $flags (optional)
+ * @return RevisionRecord|null
+ */
+ public function getRevisionById( $id, $flags = 0 ) {
+ return $this->newRevisionFromConds( [ 'rev_id' => intval( $id ) ], $flags );
+ }
+
+ /**
+ * Load either the current, or a specified, revision
+ * that's attached to a given link target. If not attached
+ * to that link target, will return null.
+ *
+ * MCR migration note: this replaces Revision::newFromTitle
+ *
+ * $flags include:
+ * IDBAccessObject::READ_LATEST: Select the data from the master
+ * IDBAccessObject::READ_LOCKING : Select & lock the data from the master
+ *
+ * @param LinkTarget $linkTarget
+ * @param int $revId (optional)
+ * @param int $flags Bitfield (optional)
+ * @return RevisionRecord|null
+ */
+ public function getRevisionByTitle( LinkTarget $linkTarget, $revId = 0, $flags = 0 ) {
+ $conds = [
+ 'page_namespace' => $linkTarget->getNamespace(),
+ 'page_title' => $linkTarget->getDBkey()
+ ];
+ if ( $revId ) {
+ // Use the specified revision ID.
+ // Note that we use newRevisionFromConds here because we want to retry
+ // and fall back to master if the page is not found on a replica.
+ // Since the caller supplied a revision ID, we are pretty sure the revision is
+ // supposed to exist, so we should try hard to find it.
+ $conds['rev_id'] = $revId;
+ return $this->newRevisionFromConds( $conds, $flags );
+ } else {
+ // Use a join to get the latest revision.
+ // Note that we don't use newRevisionFromConds here because we don't want to retry
+ // and fall back to master. The assumption is that we only want to force the fallback
+ // if we are quite sure the revision exists because the caller supplied a revision ID.
+ // If the page isn't found at all on a replica, it probably simply does not exist.
+ $db = $this->getDBConnectionRefForQueryFlags( $flags );
+
+ $conds[] = 'rev_id=page_latest';
+ $rev = $this->loadRevisionFromConds( $db, $conds, $flags );
+
+ return $rev;
+ }
+ }
+
+ /**
+ * Load either the current, or a specified, revision
+ * that's attached to a given page ID.
+ * Returns null if no such revision can be found.
+ *
+ * MCR migration note: this replaces Revision::newFromPageId
+ *
+ * $flags include:
+ * IDBAccessObject::READ_LATEST: Select the data from the master (since 1.20)
+ * IDBAccessObject::READ_LOCKING : Select & lock the data from the master
+ *
+ * @param int $pageId
+ * @param int $revId (optional)
+ * @param int $flags Bitfield (optional)
+ * @return RevisionRecord|null
+ */
+ public function getRevisionByPageId( $pageId, $revId = 0, $flags = 0 ) {
+ $conds = [ 'page_id' => $pageId ];
+ if ( $revId ) {
+ // Use the specified revision ID.
+ // Note that we use newRevisionFromConds here because we want to retry
+ // and fall back to master if the page is not found on a replica.
+ // Since the caller supplied a revision ID, we are pretty sure the revision is
+ // supposed to exist, so we should try hard to find it.
+ $conds['rev_id'] = $revId;
+ return $this->newRevisionFromConds( $conds, $flags );
+ } else {
+ // Use a join to get the latest revision.
+ // Note that we don't use newRevisionFromConds here because we don't want to retry
+ // and fall back to master. The assumption is that we only want to force the fallback
+ // if we are quite sure the revision exists because the caller supplied a revision ID.
+ // If the page isn't found at all on a replica, it probably simply does not exist.
+ $db = $this->getDBConnectionRefForQueryFlags( $flags );
+
+ $conds[] = 'rev_id=page_latest';
+ $rev = $this->loadRevisionFromConds( $db, $conds, $flags );
+
+ return $rev;
+ }
+ }
+
+ /**
+ * Load the revision for the given title with the given timestamp.
+ * WARNING: Timestamps may in some circumstances not be unique,
+ * so this isn't the best key to use.
+ *
+ * MCR migration note: this replaces Revision::loadFromTimestamp
+ *
+ * @param Title $title
+ * @param string $timestamp
+ * @return RevisionRecord|null
+ */
+ public function getRevisionByTimestamp( $title, $timestamp ) {
+ $db = $this->getDBConnection( DB_REPLICA );
+ return $this->newRevisionFromConds(
+ [
+ 'rev_timestamp' => $db->timestamp( $timestamp ),
+ 'page_namespace' => $title->getNamespace(),
+ 'page_title' => $title->getDBkey()
+ ],
+ 0,
+ $title
+ );
+ }
+
+ /**
+ * @param int $revId The revision to load slots for.
+ * @param int $queryFlags
+ *
+ * @return SlotRecord[]
+ */
+ private function loadSlotRecords( $revId, $queryFlags ) {
+ $revQuery = self::getSlotsQueryInfo( [ 'content' ] );
+
+ list( $dbMode, $dbOptions ) = DBAccessObjectUtils::getDBOptions( $queryFlags );
+ $db = $this->getDBConnectionRef( $dbMode );
+
+ $res = $db->select(
+ $revQuery['tables'],
+ $revQuery['fields'],
+ [
+ 'slot_revision_id' => $revId,
+ ],
+ __METHOD__,
+ $dbOptions,
+ $revQuery['joins']
+ );
+
+ $slots = [];
+
+ foreach ( $res as $row ) {
+ // resolve role names and model names from in-memory cache, instead of joining.
+ $row->role_name = $this->slotRoleStore->getName( (int)$row->slot_role_id );
+ $row->model_name = $this->contentModelStore->getName( (int)$row->content_model );
+
+ $contentCallback = function ( SlotRecord $slot ) use ( $queryFlags, $row ) {
+ return $this->loadSlotContent( $slot, null, null, null, $queryFlags );
+ };
+
+ $slots[$row->role_name] = new SlotRecord( $row, $contentCallback );
+ }
+
+ if ( !isset( $slots[SlotRecord::MAIN] ) ) {
+ throw new RevisionAccessException(
+ 'Main slot of revision ' . $revId . ' not found in database!'
+ );
+ };
+
+ return $slots;
+ }
+
+ /**
+ * Factory method for RevisionSlots.
+ *
+ * @note If other code has a need to construct RevisionSlots objects, this should be made
+ * public, since RevisionSlots instances should not be constructed directly.
+ *
+ * @param int $revId
+ * @param object $revisionRow
+ * @param int $queryFlags
+ * @param Title $title
+ *
+ * @return RevisionSlots
+ * @throws MWException
+ */
+ private function newRevisionSlots(
+ $revId,
+ $revisionRow,
+ $queryFlags,
+ Title $title
+ ) {
+ if ( !$this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_NEW ) ) {
+ $mainSlot = $this->emulateMainSlot_1_29( $revisionRow, $queryFlags, $title );
+ $slots = new RevisionSlots( [ SlotRecord::MAIN => $mainSlot ] );
+ } else {
+ // XXX: do we need the same kind of caching here
+ // that getKnownCurrentRevision uses (if $revId == page_latest?)
+
+ $slots = new RevisionSlots( function () use( $revId, $queryFlags ) {
+ return $this->loadSlotRecords( $revId, $queryFlags );
+ } );
+ }
+
+ return $slots;
+ }
+
+ /**
+ * Make a fake revision object from an archive table row. This is queried
+ * for permissions or even inserted (as in Special:Undelete)
+ *
+ * MCR migration note: this replaces Revision::newFromArchiveRow
+ *
+ * @param object $row
+ * @param int $queryFlags
+ * @param Title|null $title
+ * @param array $overrides associative array with fields of $row to override. This may be
+ * used e.g. to force the parent revision ID or page ID. Keys in the array are fields
+ * names from the archive table without the 'ar_' prefix, i.e. use 'parent_id' to
+ * override ar_parent_id.
+ *
+ * @return RevisionRecord
+ * @throws MWException
+ */
+ public function newRevisionFromArchiveRow(
+ $row,
+ $queryFlags = 0,
+ Title $title = null,
+ array $overrides = []
+ ) {
+ Assert::parameterType( 'object', $row, '$row' );
+
+ // check second argument, since Revision::newFromArchiveRow had $overrides in that spot.
+ Assert::parameterType( 'integer', $queryFlags, '$queryFlags' );
+
+ if ( !$title && isset( $overrides['title'] ) ) {
+ if ( !( $overrides['title'] instanceof Title ) ) {
+ throw new MWException( 'title field override must contain a Title object.' );
+ }
+
+ $title = $overrides['title'];
+ }
+
+ if ( !isset( $title ) ) {
+ if ( isset( $row->ar_namespace ) && isset( $row->ar_title ) ) {
+ $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
+ } else {
+ throw new InvalidArgumentException(
+ 'A Title or ar_namespace and ar_title must be given'
+ );
+ }
+ }
+
+ foreach ( $overrides as $key => $value ) {
+ $field = "ar_$key";
+ $row->$field = $value;
+ }
+
+ try {
+ $user = User::newFromAnyId(
+ $row->ar_user ?? null,
+ $row->ar_user_text ?? null,
+ $row->ar_actor ?? null
+ );
+ } catch ( InvalidArgumentException $ex ) {
+ wfWarn( __METHOD__ . ': ' . $title->getPrefixedDBkey() . ': ' . $ex->getMessage() );
+ $user = new UserIdentityValue( 0, 'Unknown user', 0 );
+ }
+
+ $db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
+ // Legacy because $row may have come from self::selectFields()
+ $comment = $this->commentStore->getCommentLegacy( $db, 'ar_comment', $row, true );
+
+ $slots = $this->newRevisionSlots( $row->ar_rev_id, $row, $queryFlags, $title );
+
+ return new RevisionArchiveRecord( $title, $user, $comment, $row, $slots, $this->wikiId );
+ }
+
+ /**
+ * @see RevisionFactory::newRevisionFromRow
+ *
+ * MCR migration note: this replaces Revision::newFromRow
+ *
+ * @param object $row
+ * @param int $queryFlags
+ * @param Title|null $title
+ *
+ * @return RevisionRecord
+ */
+ public function newRevisionFromRow( $row, $queryFlags = 0, Title $title = null ) {
+ Assert::parameterType( 'object', $row, '$row' );
+
+ if ( !$title ) {
+ $pageId = $row->rev_page ?? 0; // XXX: also check page_id?
+ $revId = $row->rev_id ?? 0;
+
+ $title = $this->getTitle( $pageId, $revId, $queryFlags );
+ }
+
+ if ( !isset( $row->page_latest ) ) {
+ $row->page_latest = $title->getLatestRevID();
+ if ( $row->page_latest === 0 && $title->exists() ) {
+ wfWarn( 'Encountered title object in limbo: ID ' . $title->getArticleID() );
+ }
+ }
+
+ try {
+ $user = User::newFromAnyId(
+ $row->rev_user ?? null,
+ $row->rev_user_text ?? null,
+ $row->rev_actor ?? null
+ );
+ } catch ( InvalidArgumentException $ex ) {
+ wfWarn( __METHOD__ . ': ' . $title->getPrefixedDBkey() . ': ' . $ex->getMessage() );
+ $user = new UserIdentityValue( 0, 'Unknown user', 0 );
+ }
+
+ $db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
+ // Legacy because $row may have come from self::selectFields()
+ $comment = $this->commentStore->getCommentLegacy( $db, 'rev_comment', $row, true );
+
+ $slots = $this->newRevisionSlots( $row->rev_id, $row, $queryFlags, $title );
+
+ return new RevisionStoreRecord( $title, $user, $comment, $row, $slots, $this->wikiId );
+ }
+
+ /**
+ * Constructs a new MutableRevisionRecord based on the given associative array following
+ * the MW1.29 convention for the Revision constructor.
+ *
+ * MCR migration note: this replaces Revision::newFromRow
+ *
+ * @param array $fields
+ * @param int $queryFlags
+ * @param Title|null $title
+ *
+ * @return MutableRevisionRecord
+ * @throws MWException
+ * @throws RevisionAccessException
+ */
+ public function newMutableRevisionFromArray(
+ array $fields,
+ $queryFlags = 0,
+ Title $title = null
+ ) {
+ if ( !$title && isset( $fields['title'] ) ) {
+ if ( !( $fields['title'] instanceof Title ) ) {
+ throw new MWException( 'title field must contain a Title object.' );
+ }
+
+ $title = $fields['title'];
+ }
+
+ if ( !$title ) {
+ $pageId = $fields['page'] ?? 0;
+ $revId = $fields['id'] ?? 0;
+
+ $title = $this->getTitle( $pageId, $revId, $queryFlags );
+ }
+
+ if ( !isset( $fields['page'] ) ) {
+ $fields['page'] = $title->getArticleID( $queryFlags );
+ }
+
+ // if we have a content object, use it to set the model and type
+ if ( !empty( $fields['content'] ) ) {
+ if ( !( $fields['content'] instanceof Content ) && !is_array( $fields['content'] ) ) {
+ throw new MWException(
+ 'content field must contain a Content object or an array of Content objects.'
+ );
+ }
+ }
+
+ if ( !empty( $fields['text_id'] ) ) {
+ if ( !$this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_OLD ) ) {
+ throw new MWException( "The text_id field is only available in the pre-MCR schema" );
+ }
+
+ if ( !empty( $fields['content'] ) ) {
+ throw new MWException(
+ "Text already stored in external store (id {$fields['text_id']}), " .
+ "can't specify content object"
+ );
+ }
+ }
+
+ if (
+ isset( $fields['comment'] )
+ && !( $fields['comment'] instanceof CommentStoreComment )
+ ) {
+ $commentData = $fields['comment_data'] ?? null;
+
+ if ( $fields['comment'] instanceof Message ) {
+ $fields['comment'] = CommentStoreComment::newUnsavedComment(
+ $fields['comment'],
+ $commentData
+ );
+ } else {
+ $commentText = trim( strval( $fields['comment'] ) );
+ $fields['comment'] = CommentStoreComment::newUnsavedComment(
+ $commentText,
+ $commentData
+ );
+ }
+ }
+
+ $revision = new MutableRevisionRecord( $title, $this->wikiId );
+ $this->initializeMutableRevisionFromArray( $revision, $fields );
+
+ if ( isset( $fields['content'] ) && is_array( $fields['content'] ) ) {
+ foreach ( $fields['content'] as $role => $content ) {
+ $revision->setContent( $role, $content );
+ }
+ } else {
+ $mainSlot = $this->emulateMainSlot_1_29( $fields, $queryFlags, $title );
+ $revision->setSlot( $mainSlot );
+ }
+
+ return $revision;
+ }
+
+ /**
+ * @param MutableRevisionRecord $record
+ * @param array $fields
+ */
+ private function initializeMutableRevisionFromArray(
+ MutableRevisionRecord $record,
+ array $fields
+ ) {
+ /** @var UserIdentity $user */
+ $user = null;
+
+ if ( isset( $fields['user'] ) && ( $fields['user'] instanceof UserIdentity ) ) {
+ $user = $fields['user'];
+ } else {
+ try {
+ $user = User::newFromAnyId(
+ $fields['user'] ?? null,
+ $fields['user_text'] ?? null,
+ $fields['actor'] ?? null
+ );
+ } catch ( InvalidArgumentException $ex ) {
+ $user = null;
+ }
+ }
+
+ if ( $user ) {
+ $record->setUser( $user );
+ }
+
+ $timestamp = isset( $fields['timestamp'] )
+ ? strval( $fields['timestamp'] )
+ : wfTimestampNow(); // TODO: use a callback, so we can override it for testing.
+
+ $record->setTimestamp( $timestamp );
+
+ if ( isset( $fields['page'] ) ) {
+ $record->setPageId( intval( $fields['page'] ) );
+ }
+
+ if ( isset( $fields['id'] ) ) {
+ $record->setId( intval( $fields['id'] ) );
+ }
+ if ( isset( $fields['parent_id'] ) ) {
+ $record->setParentId( intval( $fields['parent_id'] ) );
+ }
+
+ if ( isset( $fields['sha1'] ) ) {
+ $record->setSha1( $fields['sha1'] );
+ }
+ if ( isset( $fields['size'] ) ) {
+ $record->setSize( intval( $fields['size'] ) );
+ }
+
+ if ( isset( $fields['minor_edit'] ) ) {
+ $record->setMinorEdit( intval( $fields['minor_edit'] ) !== 0 );
+ }
+ if ( isset( $fields['deleted'] ) ) {
+ $record->setVisibility( intval( $fields['deleted'] ) );
+ }
+
+ if ( isset( $fields['comment'] ) ) {
+ Assert::parameterType(
+ CommentStoreComment::class,
+ $fields['comment'],
+ '$row[\'comment\']'
+ );
+ $record->setComment( $fields['comment'] );
+ }
+ }
+
+ /**
+ * Load a page revision from a given revision ID number.
+ * Returns null if no such revision can be found.
+ *
+ * MCR migration note: this corresponds to Revision::loadFromId
+ *
+ * @note direct use is deprecated!
+ * @todo remove when unused! there seem to be no callers of Revision::loadFromId
+ *
+ * @param IDatabase $db
+ * @param int $id
+ *
+ * @return RevisionRecord|null
+ */
+ public function loadRevisionFromId( IDatabase $db, $id ) {
+ return $this->loadRevisionFromConds( $db, [ 'rev_id' => intval( $id ) ] );
+ }
+
+ /**
+ * Load either the current, or a specified, revision
+ * that's attached to a given page. If not attached
+ * to that page, will return null.
+ *
+ * MCR migration note: this replaces Revision::loadFromPageId
+ *
+ * @note direct use is deprecated!
+ * @todo remove when unused!
+ *
+ * @param IDatabase $db
+ * @param int $pageid
+ * @param int $id
+ * @return RevisionRecord|null
+ */
+ public function loadRevisionFromPageId( IDatabase $db, $pageid, $id = 0 ) {
+ $conds = [ 'rev_page' => intval( $pageid ), 'page_id' => intval( $pageid ) ];
+ if ( $id ) {
+ $conds['rev_id'] = intval( $id );
+ } else {
+ $conds[] = 'rev_id=page_latest';
+ }
+ return $this->loadRevisionFromConds( $db, $conds );
+ }
+
+ /**
+ * Load either the current, or a specified, revision
+ * that's attached to a given page. If not attached
+ * to that page, will return null.
+ *
+ * MCR migration note: this replaces Revision::loadFromTitle
+ *
+ * @note direct use is deprecated!
+ * @todo remove when unused!
+ *
+ * @param IDatabase $db
+ * @param Title $title
+ * @param int $id
+ *
+ * @return RevisionRecord|null
+ */
+ public function loadRevisionFromTitle( IDatabase $db, $title, $id = 0 ) {
+ if ( $id ) {
+ $matchId = intval( $id );
+ } else {
+ $matchId = 'page_latest';
+ }
+
+ return $this->loadRevisionFromConds(
+ $db,
+ [
+ "rev_id=$matchId",
+ 'page_namespace' => $title->getNamespace(),
+ 'page_title' => $title->getDBkey()
+ ],
+ 0,
+ $title
+ );
+ }
+
+ /**
+ * Load the revision for the given title with the given timestamp.
+ * WARNING: Timestamps may in some circumstances not be unique,
+ * so this isn't the best key to use.
+ *
+ * MCR migration note: this replaces Revision::loadFromTimestamp
+ *
+ * @note direct use is deprecated! Use getRevisionFromTimestamp instead!
+ * @todo remove when unused!
+ *
+ * @param IDatabase $db
+ * @param Title $title
+ * @param string $timestamp
+ * @return RevisionRecord|null
+ */
+ public function loadRevisionFromTimestamp( IDatabase $db, $title, $timestamp ) {
+ return $this->loadRevisionFromConds( $db,
+ [
+ 'rev_timestamp' => $db->timestamp( $timestamp ),
+ 'page_namespace' => $title->getNamespace(),
+ 'page_title' => $title->getDBkey()
+ ],
+ 0,
+ $title
+ );
+ }
+
+ /**
+ * Given a set of conditions, fetch a revision
+ *
+ * This method should be used if we are pretty sure the revision exists.
+ * Unless $flags has READ_LATEST set, this method will first try to find the revision
+ * on a replica before hitting the master database.
+ *
+ * MCR migration note: this corresponds to Revision::newFromConds
+ *
+ * @param array $conditions
+ * @param int $flags (optional)
+ * @param Title|null $title
+ *
+ * @return RevisionRecord|null
+ */
+ private function newRevisionFromConds( $conditions, $flags = 0, Title $title = null ) {
+ $db = $this->getDBConnectionRefForQueryFlags( $flags );
+ $rev = $this->loadRevisionFromConds( $db, $conditions, $flags, $title );
+
+ $lb = $this->getDBLoadBalancer();
+
+ // Make sure new pending/committed revision are visibile later on
+ // within web requests to certain avoid bugs like T93866 and T94407.
+ if ( !$rev
+ && !( $flags & self::READ_LATEST )
+ && $lb->getServerCount() > 1
+ && $lb->hasOrMadeRecentMasterChanges()
+ ) {
+ $flags = self::READ_LATEST;
+ $dbw = $this->getDBConnection( DB_MASTER );
+ $rev = $this->loadRevisionFromConds( $dbw, $conditions, $flags, $title );
+ $this->releaseDBConnection( $dbw );
+ }
+
+ return $rev;
+ }
+
+ /**
+ * Given a set of conditions, fetch a revision from
+ * the given database connection.
+ *
+ * MCR migration note: this corresponds to Revision::loadFromConds
+ *
+ * @param IDatabase $db
+ * @param array $conditions
+ * @param int $flags (optional)
+ * @param Title|null $title
+ *
+ * @return RevisionRecord|null
+ */
+ private function loadRevisionFromConds(
+ IDatabase $db,
+ $conditions,
+ $flags = 0,
+ Title $title = null
+ ) {
+ $row = $this->fetchRevisionRowFromConds( $db, $conditions, $flags );
+ if ( $row ) {
+ $rev = $this->newRevisionFromRow( $row, $flags, $title );
+
+ return $rev;
+ }
+
+ return null;
+ }
+
+ /**
+ * Throws an exception if the given database connection does not belong to the wiki this
+ * RevisionStore is bound to.
+ *
+ * @param IDatabase $db
+ * @throws MWException
+ */
+ private function checkDatabaseWikiId( IDatabase $db ) {
+ $storeWiki = $this->wikiId;
+ $dbWiki = $db->getDomainID();
+
+ if ( $dbWiki === $storeWiki ) {
+ return;
+ }
+
+ // XXX: we really want the default database ID...
+ $storeWiki = $storeWiki ?: wfWikiID();
+ $dbWiki = $dbWiki ?: wfWikiID();
+
+ if ( $dbWiki === $storeWiki ) {
+ return;
+ }
+
+ // HACK: counteract encoding imposed by DatabaseDomain
+ $storeWiki = str_replace( '?h', '-', $storeWiki );
+ $dbWiki = str_replace( '?h', '-', $dbWiki );
+
+ if ( $dbWiki === $storeWiki ) {
+ return;
+ }
+
+ throw new MWException( "RevisionStore for $storeWiki "
+ . "cannot be used with a DB connection for $dbWiki" );
+ }
+
+ /**
+ * Given a set of conditions, return a row with the
+ * fields necessary to build RevisionRecord objects.
+ *
+ * MCR migration note: this corresponds to Revision::fetchFromConds
+ *
+ * @param IDatabase $db
+ * @param array $conditions
+ * @param int $flags (optional)
+ *
+ * @return object|false data row as a raw object
+ */
+ private function fetchRevisionRowFromConds( IDatabase $db, $conditions, $flags = 0 ) {
+ $this->checkDatabaseWikiId( $db );
+
+ $revQuery = $this->getQueryInfo( [ 'page', 'user' ] );
+ $options = [];
+ if ( ( $flags & self::READ_LOCKING ) == self::READ_LOCKING ) {
+ $options[] = 'FOR UPDATE';
+ }
+ return $db->selectRow(
+ $revQuery['tables'],
+ $revQuery['fields'],
+ $conditions,
+ __METHOD__,
+ $options,
+ $revQuery['joins']
+ );
+ }
+
+ /**
+ * Finds the ID of a content row for a given revision and slot role.
+ * This can be used to re-use content rows even while the content ID
+ * is still missing from SlotRecords, when writing to both the old and
+ * the new schema during MCR schema migration.
+ *
+ * @todo remove after MCR schema migration is complete.
+ *
+ * @param IDatabase $db
+ * @param int $revId
+ * @param string $role
+ *
+ * @return int|null
+ */
+ private function findSlotContentId( IDatabase $db, $revId, $role ) {
+ if ( !$this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_NEW ) ) {
+ return null;
+ }
+
+ try {
+ $roleId = $this->slotRoleStore->getId( $role );
+ $conditions = [
+ 'slot_revision_id' => $revId,
+ 'slot_role_id' => $roleId,
+ ];
+
+ $contentId = $db->selectField( 'slots', 'slot_content_id', $conditions, __METHOD__ );
+
+ return $contentId ?: null;
+ } catch ( NameTableAccessException $ex ) {
+ // If the role is missing from the slot_roles table,
+ // the corresponding row in slots cannot exist.
+ return null;
+ }
+ }
+
+ /**
+ * Return the tables, fields, and join conditions to be selected to create
+ * a new RevisionStoreRecord object.
+ *
+ * MCR migration note: this replaces Revision::getQueryInfo
+ *
+ * If the format of fields returned changes in any way then the cache key provided by
+ * self::getRevisionRowCacheKey should be updated.
+ *
+ * @since 1.31
+ *
+ * @param array $options Any combination of the following strings
+ * - 'page': Join with the page table, and select fields to identify the page
+ * - 'user': Join with the user table, and select the user name
+ * - 'text': Join with the text table, and select fields to load page text. This
+ * option is deprecated in MW 1.32 when the MCR migration flag SCHEMA_COMPAT_WRITE_NEW
+ * is set, and disallowed when SCHEMA_COMPAT_READ_OLD is not set.
+ *
+ * @return array With three keys:
+ * - tables: (string[]) to include in the `$table` to `IDatabase->select()`
+ * - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
+ * - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
+ */
+ public function getQueryInfo( $options = [] ) {
+ $ret = [
+ 'tables' => [],
+ 'fields' => [],
+ 'joins' => [],
+ ];
+
+ $ret['tables'][] = 'revision';
+ $ret['fields'] = array_merge( $ret['fields'], [
+ 'rev_id',
+ 'rev_page',
+ 'rev_timestamp',
+ 'rev_minor_edit',
+ 'rev_deleted',
+ 'rev_len',
+ 'rev_parent_id',
+ 'rev_sha1',
+ ] );
+
+ $commentQuery = $this->commentStore->getJoin( 'rev_comment' );
+ $ret['tables'] = array_merge( $ret['tables'], $commentQuery['tables'] );
+ $ret['fields'] = array_merge( $ret['fields'], $commentQuery['fields'] );
+ $ret['joins'] = array_merge( $ret['joins'], $commentQuery['joins'] );
+
+ $actorQuery = $this->actorMigration->getJoin( 'rev_user' );
+ $ret['tables'] = array_merge( $ret['tables'], $actorQuery['tables'] );
+ $ret['fields'] = array_merge( $ret['fields'], $actorQuery['fields'] );
+ $ret['joins'] = array_merge( $ret['joins'], $actorQuery['joins'] );
+
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_OLD ) ) {
+ $ret['fields'][] = 'rev_text_id';
+
+ if ( $this->contentHandlerUseDB ) {
+ $ret['fields'][] = 'rev_content_format';
+ $ret['fields'][] = 'rev_content_model';
+ }
+ }
+
+ if ( in_array( 'page', $options, true ) ) {
+ $ret['tables'][] = 'page';
+ $ret['fields'] = array_merge( $ret['fields'], [
+ 'page_namespace',
+ 'page_title',
+ 'page_id',
+ 'page_latest',
+ 'page_is_redirect',
+ 'page_len',
+ ] );
+ $ret['joins']['page'] = [ 'INNER JOIN', [ 'page_id = rev_page' ] ];
+ }
+
+ if ( in_array( 'user', $options, true ) ) {
+ $ret['tables'][] = 'user';
+ $ret['fields'] = array_merge( $ret['fields'], [
+ 'user_name',
+ ] );
+ $u = $actorQuery['fields']['rev_user'];
+ $ret['joins']['user'] = [ 'LEFT JOIN', [ "$u != 0", "user_id = $u" ] ];
+ }
+
+ if ( in_array( 'text', $options, true ) ) {
+ if ( !$this->hasMcrSchemaFlags( SCHEMA_COMPAT_WRITE_OLD ) ) {
+ throw new InvalidArgumentException( 'text table can no longer be joined directly' );
+ } elseif ( !$this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_OLD ) ) {
+ // NOTE: even when this class is set to not read from the old schema, callers
+ // should still be able to join against the text table, as long as we are still
+ // writing the old schema for compatibility.
+ // TODO: This should trigger a deprecation warning eventually (T200918), but not
+ // before all known usages are removed (see T198341 and T201164).
+ // wfDeprecated( __METHOD__ . ' with `text` option', '1.32' );
+ }
+
+ $ret['tables'][] = 'text';
+ $ret['fields'] = array_merge( $ret['fields'], [
+ 'old_text',
+ 'old_flags'
+ ] );
+ $ret['joins']['text'] = [ 'INNER JOIN', [ 'rev_text_id=old_id' ] ];
+ }
+
+ return $ret;
+ }
+
+ /**
+ * Return the tables, fields, and join conditions to be selected to create
+ * a new SlotRecord.
+ *
+ * @since 1.32
+ *
+ * @param array $options Any combination of the following strings
+ * - 'content': Join with the content table, and select content meta-data fields
+ * - 'model': Join with the content_models table, and select the model_name field.
+ * Only applicable if 'content' is also set.
+ * - 'role': Join with the slot_roles table, and select the role_name field
+ *
+ * @return array With three keys:
+ * - tables: (string[]) to include in the `$table` to `IDatabase->select()`
+ * - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
+ * - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
+ */
+ public function getSlotsQueryInfo( $options = [] ) {
+ $ret = [
+ 'tables' => [],
+ 'fields' => [],
+ 'joins' => [],
+ ];
+
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_OLD ) ) {
+ $db = $this->getDBConnectionRef( DB_REPLICA );
+ $ret['tables']['slots'] = 'revision';
+
+ $ret['fields']['slot_revision_id'] = 'slots.rev_id';
+ $ret['fields']['slot_content_id'] = 'NULL';
+ $ret['fields']['slot_origin'] = 'slots.rev_id';
+ $ret['fields']['role_name'] = $db->addQuotes( SlotRecord::MAIN );
+
+ if ( in_array( 'content', $options, true ) ) {
+ $ret['fields']['content_size'] = 'slots.rev_len';
+ $ret['fields']['content_sha1'] = 'slots.rev_sha1';
+ $ret['fields']['content_address']
+ = $db->buildConcat( [ $db->addQuotes( 'tt:' ), 'slots.rev_text_id' ] );
+
+ if ( $this->contentHandlerUseDB ) {
+ $ret['fields']['model_name'] = 'slots.rev_content_model';
+ } else {
+ $ret['fields']['model_name'] = 'NULL';
+ }
+ }
+ } else {
+ $ret['tables'][] = 'slots';
+ $ret['fields'] = array_merge( $ret['fields'], [
+ 'slot_revision_id',
+ 'slot_content_id',
+ 'slot_origin',
+ 'slot_role_id',
+ ] );
+
+ if ( in_array( 'role', $options, true ) ) {
+ // Use left join to attach role name, so we still find the revision row even
+ // if the role name is missing. This triggers a more obvious failure mode.
+ $ret['tables'][] = 'slot_roles';
+ $ret['joins']['slot_roles'] = [ 'LEFT JOIN', [ 'slot_role_id = role_id' ] ];
+ $ret['fields'][] = 'role_name';
+ }
+
+ if ( in_array( 'content', $options, true ) ) {
+ $ret['tables'][] = 'content';
+ $ret['fields'] = array_merge( $ret['fields'], [
+ 'content_size',
+ 'content_sha1',
+ 'content_address',
+ 'content_model',
+ ] );
+ $ret['joins']['content'] = [ 'INNER JOIN', [ 'slot_content_id = content_id' ] ];
+
+ if ( in_array( 'model', $options, true ) ) {
+ // Use left join to attach model name, so we still find the revision row even
+ // if the model name is missing. This triggers a more obvious failure mode.
+ $ret['tables'][] = 'content_models';
+ $ret['joins']['content_models'] = [ 'LEFT JOIN', [ 'content_model = model_id' ] ];
+ $ret['fields'][] = 'model_name';
+ }
+
+ }
+ }
+
+ return $ret;
+ }
+
+ /**
+ * Return the tables, fields, and join conditions to be selected to create
+ * a new RevisionArchiveRecord object.
+ *
+ * MCR migration note: this replaces Revision::getArchiveQueryInfo
+ *
+ * @since 1.31
+ *
+ * @return array With three keys:
+ * - tables: (string[]) to include in the `$table` to `IDatabase->select()`
+ * - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
+ * - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
+ */
+ public function getArchiveQueryInfo() {
+ $commentQuery = $this->commentStore->getJoin( 'ar_comment' );
+ $actorQuery = $this->actorMigration->getJoin( 'ar_user' );
+ $ret = [
+ 'tables' => [ 'archive' ] + $commentQuery['tables'] + $actorQuery['tables'],
+ 'fields' => [
+ 'ar_id',
+ 'ar_page_id',
+ 'ar_namespace',
+ 'ar_title',
+ 'ar_rev_id',
+ 'ar_timestamp',
+ 'ar_minor_edit',
+ 'ar_deleted',
+ 'ar_len',
+ 'ar_parent_id',
+ 'ar_sha1',
+ ] + $commentQuery['fields'] + $actorQuery['fields'],
+ 'joins' => $commentQuery['joins'] + $actorQuery['joins'],
+ ];
+
+ if ( $this->hasMcrSchemaFlags( SCHEMA_COMPAT_READ_OLD ) ) {
+ $ret['fields'][] = 'ar_text_id';
+
+ if ( $this->contentHandlerUseDB ) {
+ $ret['fields'][] = 'ar_content_format';
+ $ret['fields'][] = 'ar_content_model';
+ }
+ }
+
+ return $ret;
+ }
+
+ /**
+ * Do a batched query for the sizes of a set of revisions.
+ *
+ * MCR migration note: this replaces Revision::getParentLengths
+ *
+ * @param int[] $revIds
+ * @return int[] associative array mapping revision IDs from $revIds to the nominal size
+ * of the corresponding revision.
+ */
+ public function getRevisionSizes( array $revIds ) {
+ return $this->listRevisionSizes( $this->getDBConnection( DB_REPLICA ), $revIds );
+ }
+
+ /**
+ * Do a batched query for the sizes of a set of revisions.
+ *
+ * MCR migration note: this replaces Revision::getParentLengths
+ *
+ * @deprecated use RevisionStore::getRevisionSizes instead.
+ *
+ * @param IDatabase $db
+ * @param int[] $revIds
+ * @return int[] associative array mapping revision IDs from $revIds to the nominal size
+ * of the corresponding revision.
+ */
+ public function listRevisionSizes( IDatabase $db, array $revIds ) {
+ $this->checkDatabaseWikiId( $db );
+
+ $revLens = [];
+ if ( !$revIds ) {
+ return $revLens; // empty
+ }
+
+ $res = $db->select(
+ 'revision',
+ [ 'rev_id', 'rev_len' ],
+ [ 'rev_id' => $revIds ],
+ __METHOD__
+ );
+
+ foreach ( $res as $row ) {
+ $revLens[$row->rev_id] = intval( $row->rev_len );
+ }
+
+ return $revLens;
+ }
+
+ /**
+ * Get previous revision for this title
+ *
+ * MCR migration note: this replaces Revision::getPrevious
+ *
+ * @param RevisionRecord $rev
+ * @param Title|null $title if known (optional)
+ *
+ * @return RevisionRecord|null
+ */
+ public function getPreviousRevision( RevisionRecord $rev, Title $title = null ) {
+ if ( $title === null ) {
+ $title = $this->getTitle( $rev->getPageId(), $rev->getId() );
+ }
+ $prev = $title->getPreviousRevisionID( $rev->getId() );
+ if ( $prev ) {
+ return $this->getRevisionByTitle( $title, $prev );
+ }
+ return null;
+ }
+
+ /**
+ * Get next revision for this title
+ *
+ * MCR migration note: this replaces Revision::getNext
+ *
+ * @param RevisionRecord $rev
+ * @param Title|null $title if known (optional)
+ *
+ * @return RevisionRecord|null
+ */
+ public function getNextRevision( RevisionRecord $rev, Title $title = null ) {
+ if ( $title === null ) {
+ $title = $this->getTitle( $rev->getPageId(), $rev->getId() );
+ }
+ $next = $title->getNextRevisionID( $rev->getId() );
+ if ( $next ) {
+ return $this->getRevisionByTitle( $title, $next );
+ }
+ return null;
+ }
+
+ /**
+ * Get previous revision Id for this page_id
+ * This is used to populate rev_parent_id on save
+ *
+ * MCR migration note: this corresponds to Revision::getPreviousRevisionId
+ *
+ * @param IDatabase $db
+ * @param RevisionRecord $rev
+ *
+ * @return int
+ */
+ private function getPreviousRevisionId( IDatabase $db, RevisionRecord $rev ) {
+ $this->checkDatabaseWikiId( $db );
+
+ if ( $rev->getPageId() === null ) {
+ return 0;
+ }
+ # Use page_latest if ID is not given
+ if ( !$rev->getId() ) {
+ $prevId = $db->selectField(
+ 'page', 'page_latest',
+ [ 'page_id' => $rev->getPageId() ],
+ __METHOD__
+ );
+ } else {
+ $prevId = $db->selectField(
+ 'revision', 'rev_id',
+ [ 'rev_page' => $rev->getPageId(), 'rev_id < ' . $rev->getId() ],
+ __METHOD__,
+ [ 'ORDER BY' => 'rev_id DESC' ]
+ );
+ }
+ return intval( $prevId );
+ }
+
+ /**
+ * Get rev_timestamp from rev_id, without loading the rest of the row
+ *
+ * MCR migration note: this replaces Revision::getTimestampFromId
+ *
+ * @param Title $title
+ * @param int $id
+ * @param int $flags
+ * @return string|bool False if not found
+ */
+ public function getTimestampFromId( $title, $id, $flags = 0 ) {
+ $db = $this->getDBConnectionRefForQueryFlags( $flags );
+
+ $conds = [ 'rev_id' => $id ];
+ $conds['rev_page'] = $title->getArticleID();
+ $timestamp = $db->selectField( 'revision', 'rev_timestamp', $conds, __METHOD__ );
+
+ return ( $timestamp !== false ) ? wfTimestamp( TS_MW, $timestamp ) : false;
+ }
+
+ /**
+ * Get count of revisions per page...not very efficient
+ *
+ * MCR migration note: this replaces Revision::countByPageId
+ *
+ * @param IDatabase $db
+ * @param int $id Page id
+ * @return int
+ */
+ public function countRevisionsByPageId( IDatabase $db, $id ) {
+ $this->checkDatabaseWikiId( $db );
+
+ $row = $db->selectRow( 'revision',
+ [ 'revCount' => 'COUNT(*)' ],
+ [ 'rev_page' => $id ],
+ __METHOD__
+ );
+ if ( $row ) {
+ return intval( $row->revCount );
+ }
+ return 0;
+ }
+
+ /**
+ * Get count of revisions per page...not very efficient
+ *
+ * MCR migration note: this replaces Revision::countByTitle
+ *
+ * @param IDatabase $db
+ * @param Title $title
+ * @return int
+ */
+ public function countRevisionsByTitle( IDatabase $db, $title ) {
+ $id = $title->getArticleID();
+ if ( $id ) {
+ return $this->countRevisionsByPageId( $db, $id );
+ }
+ return 0;
+ }
+
+ /**
+ * Check if no edits were made by other users since
+ * the time a user started editing the page. Limit to
+ * 50 revisions for the sake of performance.
+ *
+ * MCR migration note: this replaces Revision::userWasLastToEdit
+ *
+ * @deprecated since 1.31; Can possibly be removed, since the self-conflict suppression
+ * logic in EditPage that uses this seems conceptually dubious. Revision::userWasLastToEdit
+ * has been deprecated since 1.24.
+ *
+ * @param IDatabase $db The Database to perform the check on.
+ * @param int $pageId The ID of the page in question
+ * @param int $userId The ID of the user in question
+ * @param string $since Look at edits since this time
+ *
+ * @return bool True if the given user was the only one to edit since the given timestamp
+ */
+ public function userWasLastToEdit( IDatabase $db, $pageId, $userId, $since ) {
+ $this->checkDatabaseWikiId( $db );
+
+ if ( !$userId ) {
+ return false;
+ }
+
+ $revQuery = $this->getQueryInfo();
+ $res = $db->select(
+ $revQuery['tables'],
+ [
+ 'rev_user' => $revQuery['fields']['rev_user'],
+ ],
+ [
+ 'rev_page' => $pageId,
+ 'rev_timestamp > ' . $db->addQuotes( $db->timestamp( $since ) )
+ ],
+ __METHOD__,
+ [ 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 50 ],
+ $revQuery['joins']
+ );
+ foreach ( $res as $row ) {
+ if ( $row->rev_user != $userId ) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Load a revision based on a known page ID and current revision ID from the DB
+ *
+ * This method allows for the use of caching, though accessing anything that normally
+ * requires permission checks (aside from the text) will trigger a small DB lookup.
+ *
+ * MCR migration note: this replaces Revision::newKnownCurrent
+ *
+ * @param Title $title the associated page title
+ * @param int $revId current revision of this page. Defaults to $title->getLatestRevID().
+ *
+ * @return RevisionRecord|bool Returns false if missing
+ */
+ public function getKnownCurrentRevision( Title $title, $revId ) {
+ $db = $this->getDBConnectionRef( DB_REPLICA );
+
+ $pageId = $title->getArticleID();
+
+ if ( !$pageId ) {
+ return false;
+ }
+
+ if ( !$revId ) {
+ $revId = $title->getLatestRevID();
+ }
+
+ if ( !$revId ) {
+ wfWarn(
+ 'No latest revision known for page ' . $title->getPrefixedDBkey()
+ . ' even though it exists with page ID ' . $pageId
+ );
+ return false;
+ }
+
+ $row = $this->cache->getWithSetCallback(
+ // Page/rev IDs passed in from DB to reflect history merges
+ $this->getRevisionRowCacheKey( $db, $pageId, $revId ),
+ WANObjectCache::TTL_WEEK,
+ function ( $curValue, &$ttl, array &$setOpts ) use ( $db, $pageId, $revId ) {
+ $setOpts += Database::getCacheSetOptions( $db );
+
+ $conds = [
+ 'rev_page' => intval( $pageId ),
+ 'page_id' => intval( $pageId ),
+ 'rev_id' => intval( $revId ),
+ ];
+
+ $row = $this->fetchRevisionRowFromConds( $db, $conds );
+ return $row ?: false; // don't cache negatives
+ }
+ );
+
+ // Reflect revision deletion and user renames
+ if ( $row ) {
+ return $this->newRevisionFromRow( $row, 0, $title );
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * Get a cache key for use with a row as selected with getQueryInfo( [ 'page', 'user' ] )
+ * Caching rows without 'page' or 'user' could lead to issues.
+ * If the format of the rows returned by the query provided by getQueryInfo changes the
+ * cache key should be updated to avoid conflicts.
+ *
+ * @param IDatabase $db
+ * @param int $pageId
+ * @param int $revId
+ * @return string
+ */
+ private function getRevisionRowCacheKey( IDatabase $db, $pageId, $revId ) {
+ return $this->cache->makeGlobalKey(
+ self::ROW_CACHE_KEY,
+ $db->getDomainID(),
+ $pageId,
+ $revId
+ );
+ }
+
+ // TODO: move relevant methods from Title here, e.g. getFirstRevision, isBigDeletion, etc.
+
+}
+
+/**
+ * Retain the old class name for backwards compatibility.
+ * @deprecated since 1.32
+ */
+class_alias( RevisionStore::class, 'MediaWiki\Storage\RevisionStore' );