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RevisionStore.php
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<?php
/**
* @license GPL-2.0-or-later
* 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 (that file was removed entirely in 1.37,
* but its history can still be found in prior versions of MediaWiki).
*
* @file
*/
namespace MediaWiki\Revision;
use InvalidArgumentException;
use LogicException;
use MediaWiki\CommentStore\CommentStore;
use MediaWiki\CommentStore\CommentStoreComment;
use MediaWiki\Content\Content;
use MediaWiki\Content\FallbackContent;
use MediaWiki\Content\IContentHandlerFactory;
use MediaWiki\DAO\WikiAwareEntity;
use MediaWiki\Exception\MWException;
use MediaWiki\Exception\MWUnknownContentModelException;
use MediaWiki\HookContainer\HookContainer;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\Page\LegacyArticleIdAccess;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Page\PageIdentityValue;
use MediaWiki\Page\PageStore;
use MediaWiki\Permissions\Authority;
use MediaWiki\RecentChanges\RecentChange;
use MediaWiki\RecentChanges\RecentChangeLookup;
use MediaWiki\Storage\BadBlobException;
use MediaWiki\Storage\BlobAccessException;
use MediaWiki\Storage\BlobStore;
use MediaWiki\Storage\NameTableAccessException;
use MediaWiki\Storage\NameTableStore;
use MediaWiki\Storage\RevisionSlotsUpdate;
use MediaWiki\Storage\SqlBlobStore;
use MediaWiki\Title\Title;
use MediaWiki\Title\TitleFactory;
use MediaWiki\User\ActorStore;
use MediaWiki\User\UserIdentity;
use MediaWiki\Utils\MWTimestamp;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use RuntimeException;
use StatusValue;
use stdClass;
use Traversable;
use Wikimedia\Assert\Assert;
use Wikimedia\Assert\PreconditionException;
use Wikimedia\IPUtils;
use Wikimedia\ObjectCache\BagOStuff;
use Wikimedia\ObjectCache\WANObjectCache;
use Wikimedia\Rdbms\Database;
use Wikimedia\Rdbms\DBAccessObjectUtils;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\IDBAccessObject;
use Wikimedia\Rdbms\ILoadBalancer;
use Wikimedia\Rdbms\IReadableDatabase;
use Wikimedia\Rdbms\IResultWrapper;
use Wikimedia\Rdbms\Platform\ISQLPlatform;
use Wikimedia\Rdbms\SelectQueryBuilder;
/**
* 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 the old Revision class (which was later removed in 1.37).
*/
class RevisionStore implements RevisionFactory, RevisionLookup, LoggerAwareInterface {
use LegacyArticleIdAccess;
public const ROW_CACHE_KEY = 'revision-row-1.29';
public const ORDER_OLDEST_TO_NEWEST = 'ASC';
public const ORDER_NEWEST_TO_OLDEST = 'DESC';
// Constants for get(...)Between methods
public const INCLUDE_OLD = 'include_old';
public const INCLUDE_NEW = 'include_new';
public const INCLUDE_BOTH = 'include_both';
/**
* @var SqlBlobStore
*/
private $blobStore;
/**
* @var false|string
*/
private $wikiId;
private ILoadBalancer $loadBalancer;
private WANObjectCache $cache;
private BagOStuff $localCache;
private CommentStore $commentStore;
private ActorStore $actorStore;
private LoggerInterface $logger;
private NameTableStore $contentModelStore;
private NameTableStore $slotRoleStore;
private SlotRoleRegistry $slotRoleRegistry;
private IContentHandlerFactory $contentHandlerFactory;
private HookRunner $hookRunner;
private PageStore $pageStore;
private TitleFactory $titleFactory;
private RecentChangeLookup $recentChangeLookup;
/**
* @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 BagOStuff $localCache Another layer of cache, best to use APCu here.
* @param CommentStore $commentStore
* @param NameTableStore $contentModelStore
* @param NameTableStore $slotRoleStore
* @param SlotRoleRegistry $slotRoleRegistry
* @param ActorStore $actorStore
* @param IContentHandlerFactory $contentHandlerFactory
* @param PageStore $pageStore
* @param TitleFactory $titleFactory
* @param HookContainer $hookContainer
* @param RecentChangeLookup $recentChangeLookup
* @param false|string $wikiId Relevant wiki id or WikiAwareEntity::LOCAL for the current one
*
* @todo $blobStore should be allowed to be any BlobStore!
*/
public function __construct(
ILoadBalancer $loadBalancer,
SqlBlobStore $blobStore,
WANObjectCache $cache,
BagOStuff $localCache,
CommentStore $commentStore,
NameTableStore $contentModelStore,
NameTableStore $slotRoleStore,
SlotRoleRegistry $slotRoleRegistry,
ActorStore $actorStore,
IContentHandlerFactory $contentHandlerFactory,
PageStore $pageStore,
TitleFactory $titleFactory,
HookContainer $hookContainer,
RecentChangeLookup $recentChangeLookup,
$wikiId = WikiAwareEntity::LOCAL
) {
Assert::parameterType( [ 'string', 'false' ], $wikiId, '$wikiId' );
$this->loadBalancer = $loadBalancer;
$this->blobStore = $blobStore;
$this->cache = $cache;
$this->localCache = $localCache;
$this->commentStore = $commentStore;
$this->contentModelStore = $contentModelStore;
$this->slotRoleStore = $slotRoleStore;
$this->slotRoleRegistry = $slotRoleRegistry;
$this->actorStore = $actorStore;
$this->wikiId = $wikiId;
$this->logger = new NullLogger();
$this->contentHandlerFactory = $contentHandlerFactory;
$this->pageStore = $pageStore;
$this->titleFactory = $titleFactory;
$this->hookRunner = new HookRunner( $hookContainer );
$this->recentChangeLookup = $recentChangeLookup;
}
public function setLogger( LoggerInterface $logger ): void {
$this->logger = $logger;
}
/**
* @return bool Whether the store is read-only
*/
public function isReadOnly() {
return $this->blobStore->isReadOnly();
}
/**
* Get the ID of the wiki this revision belongs to.
*
* @return string|false The wiki's logical name, of false to indicate the local wiki.
*/
public function getWikiId() {
return $this->wikiId;
}
/**
* @param int $queryFlags a bit field composed of READ_XXX flags
*
* @return IReadableDatabase
*/
private function getDBConnectionRefForQueryFlags( $queryFlags ) {
if ( ( $queryFlags & IDBAccessObject::READ_LATEST ) == IDBAccessObject::READ_LATEST ) {
return $this->getPrimaryConnection();
} else {
return $this->getReplicaConnection();
}
}
/**
* @param string|array $groups
* @return IReadableDatabase
*/
private function getReplicaConnection( $groups = [] ) {
// TODO: Replace with ICP
return $this->loadBalancer->getConnection( DB_REPLICA, $groups, $this->wikiId );
}
private function getPrimaryConnection(): IDatabase {
// TODO: Replace with ICP
return $this->loadBalancer->getConnection( DB_PRIMARY, [], $this->wikiId );
}
/**
* Determines the page Title based on the available information.
*
* MCR migration note: this corresponded to Revision::getTitle
*
* @deprecated since 1.36, Use RevisionRecord::getPage() instead.
* @note The resulting Title object will be misleading if the RevisionStore is not
* for the local wiki.
*
* @param int|null $pageId
* @param int|null $revId
* @param int $queryFlags
*
* @return Title
* @throws RevisionAccessException
*/
public function getTitle( $pageId, $revId, $queryFlags = IDBAccessObject::READ_NORMAL ) {
// TODO: Hard-deprecate this once getPage() returns a PageRecord. T195069
if ( $this->wikiId !== WikiAwareEntity::LOCAL ) {
wfDeprecatedMsg( 'Using a Title object to refer to a page on another site.', '1.36' );
}
$page = $this->getPage( $pageId, $revId, $queryFlags );
return $this->titleFactory->newFromPageIdentity( $page );
}
/**
* Determines the page based on the available information.
*
* @param int|null $pageId
* @param int|null $revId
* @param int $queryFlags
*
* @return PageIdentity
* @throws RevisionAccessException
*/
private function getPage( ?int $pageId, ?int $revId, int $queryFlags = IDBAccessObject::READ_NORMAL ) {
if ( !$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, IDBAccessObject::READ_LATEST_IMMUTABLE ) ) {
$queryFlags = IDBAccessObject::READ_NORMAL;
}
// Loading by ID is best
if ( $pageId !== null && $pageId > 0 ) {
$page = $this->pageStore->getPageById( $pageId, $queryFlags );
if ( $page ) {
return $this->wrapPage( $page );
}
}
// rev_id is defined as NOT NULL, but this revision may not yet have been inserted.
if ( $revId !== null && $revId > 0 ) {
$pageQuery = $this->pageStore->newSelectQueryBuilder( $queryFlags )
->join( 'revision', null, 'page_id=rev_page' )
->conds( [ 'rev_id' => $revId ] )
->caller( __METHOD__ );
$page = $pageQuery->fetchPageRecord();
if ( $page ) {
return $this->wrapPage( $page );
}
}
// If we still don't have a title, fallback to primary DB if that wasn't already happening.
if ( $queryFlags === IDBAccessObject::READ_NORMAL ) {
$title = $this->getPage( $pageId, $revId, IDBAccessObject::READ_LATEST );
if ( $title ) {
$this->logger->info(
__METHOD__ . ' fell back to READ_LATEST and got a Title.',
[ 'exception' => new RuntimeException() ]
);
return $title;
}
}
throw new RevisionAccessException(
'Could not determine title for page ID {page_id} and revision ID {rev_id}',
[
'page_id' => $pageId,
'rev_id' => $revId,
]
);
}
private function wrapPage( PageIdentity $page ): PageIdentity {
if ( $this->wikiId === WikiAwareEntity::LOCAL ) {
// NOTE: since there is still a lot of code that needs a full Title,
// and uses Title::castFromPageIdentity() to get one, it's beneficial
// to create a Title right away if we can, so we don't have to convert
// over and over later on.
// When there is less need to convert to Title, this special case can
// be removed.
return $this->titleFactory->newFromPageIdentity( $page );
} else {
return $page;
}
}
/**
* @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.
*
* This should be followed up by a WikiPage::updateRevisionOn on call to update
* page_latest on the page the revision is added to.
*
* MCR migration note: this replaced Revision::insertOn
*
* @param RevisionRecord $rev
* @param IDatabase $dbw (primary connection)
*
* @return RevisionRecord the new revision record.
*/
public function insertRevisionOn( RevisionRecord $rev, IDatabase $dbw ) {
// TODO: pass in a DBTransactionContext instead of a database connection.
$this->checkDatabaseDomain( $dbw );
$slotRoles = $rev->getSlotRoles();
// Make sure the main slot is always provided throughout migration
if ( !in_array( SlotRecord::MAIN, $slotRoles ) ) {
throw new IncompleteRevisionException(
'main slot must be provided'
);
}
// 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' );
}
if ( $slotRoles == [ SlotRecord::MAIN ] ) {
// T239717: If the main slot is the only slot, make sure the revision's nominal size
// and hash match the main slot's nominal size and hash.
$mainSlot = $rev->getSlot( SlotRecord::MAIN, RevisionRecord::RAW );
Assert::precondition(
$mainSlot->getSize() === $rev->getSize(),
'The revisions\'s size must match the main slot\'s size (see T239717)'
);
Assert::precondition(
$mainSlot->getSha1() === $rev->getSha1(),
'The revisions\'s SHA1 hash must match the main slot\'s SHA1 hash (see T239717)'
);
}
$pageId = $this->failOnEmpty( $rev->getPageId( $this->wikiId ), 'rev_page field' ); // check this early
$parentId = $rev->getParentId() ?? $this->getPreviousRevisionId( $dbw, $rev );
Assert::precondition( $pageId > 0, 'revision must have an ID' );
/** @var RevisionRecord $rev */
$rev = $dbw->doAtomicSection(
__METHOD__,
function ( IDatabase $dbw, $fname ) use (
$rev,
$user,
$comment,
$pageId,
$parentId
) {
return $this->insertRevisionInternal(
$rev,
$dbw,
$user,
$comment,
$rev->getPage(),
$pageId,
$parentId
);
}
);
Assert::postcondition( $rev->getId( $this->wikiId ) > 0, 'revision must have an ID' );
Assert::postcondition( $rev->getPageId( $this->wikiId ) > 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'
);
}
$this->hookRunner->onRevisionRecordInserted( $rev );
return $rev;
}
/**
* Update derived slots in an existing revision into the database, returning the modified
* slots on success.
*
* @param RevisionRecord $revision After this method returns, the $revision object will be
* obsolete in that it does not have the new slots.
* @param RevisionSlotsUpdate $revisionSlotsUpdate
* @param IDatabase $dbw (primary connection)
*
* @return SlotRecord[] the new slot records.
* @internal
*/
public function updateSlotsOn(
RevisionRecord $revision,
RevisionSlotsUpdate $revisionSlotsUpdate,
IDatabase $dbw
): array {
$this->checkDatabaseDomain( $dbw );
// Make sure all modified and removed slots are derived slots
foreach ( $revisionSlotsUpdate->getModifiedRoles() as $role ) {
Assert::precondition(
$this->slotRoleRegistry->getRoleHandler( $role )->isDerived(),
'Trying to modify a slot that is not derived'
);
}
foreach ( $revisionSlotsUpdate->getRemovedRoles() as $role ) {
$isDerived = $this->slotRoleRegistry->getRoleHandler( $role )->isDerived();
Assert::precondition(
$isDerived,
'Trying to remove a slot that is not derived'
);
throw new LogicException( 'Removing derived slots is not yet implemented. See T277394.' );
}
/** @var SlotRecord[] $slotRecords */
$slotRecords = $dbw->doAtomicSection(
__METHOD__,
function ( IDatabase $dbw, $fname ) use (
$revision,
$revisionSlotsUpdate
) {
return $this->updateSlotsInternal(
$revision,
$revisionSlotsUpdate,
$dbw
);
}
);
foreach ( $slotRecords as $role => $slot ) {
Assert::postcondition(
$slot->getContent() !== null,
$role . ' slot must have content'
);
Assert::postcondition(
$slot->hasRevision(),
$role . ' slot must have a revision associated'
);
}
return $slotRecords;
}
/**
* @param RevisionRecord $revision
* @param RevisionSlotsUpdate $revisionSlotsUpdate
* @param IDatabase $dbw
* @return SlotRecord[]
*/
private function updateSlotsInternal(
RevisionRecord $revision,
RevisionSlotsUpdate $revisionSlotsUpdate,
IDatabase $dbw
): array {
$page = $revision->getPage();
$revId = $revision->getId( $this->wikiId );
$blobHints = [
BlobStore::PAGE_HINT => $page->getId( $this->wikiId ),
BlobStore::REVISION_HINT => $revId,
BlobStore::PARENT_HINT => $revision->getParentId( $this->wikiId ),
];
$newSlots = [];
foreach ( $revisionSlotsUpdate->getModifiedRoles() as $role ) {
$slot = $revisionSlotsUpdate->getModifiedSlot( $role );
$newSlots[$role] = $this->insertSlotOn( $dbw, $revId, $slot, $page, $blobHints );
}
return $newSlots;
}
private function insertRevisionInternal(
RevisionRecord $rev,
IDatabase $dbw,
UserIdentity $user,
CommentStoreComment $comment,
PageIdentity $page,
int $pageId,
int $parentId
): RevisionRecord {
$slotRoles = $rev->getSlotRoles();
$revisionRow = $this->insertRevisionRowOn(
$dbw,
$rev,
$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;
} else {
$newSlots[$role] = $this->insertSlotOn( $dbw, $revisionId, $slot, $page, $blobHints );
}
}
$this->insertIpChangesRow( $dbw, $user, $rev, $revisionId );
$rev = new RevisionStoreRecord(
$page,
$user,
$comment,
(object)$revisionRow,
new RevisionSlots( $newSlots ),
$this->wikiId
);
return $rev;
}
/**
* @param IDatabase $dbw
* @param int $revisionId
* @param SlotRecord $protoSlot
* @param PageIdentity $page
* @param array $blobHints See the BlobStore::XXX_HINT constants
* @return SlotRecord
*/
private function insertSlotOn(
IDatabase $dbw,
$revisionId,
SlotRecord $protoSlot,
PageIdentity $page,
array $blobHints = []
) {
if ( $protoSlot->hasAddress() ) {
$blobAddress = $protoSlot->getAddress();
} else {
$blobAddress = $this->storeContentBlob( $protoSlot, $page, $blobHints );
}
if ( $protoSlot->hasContentId() ) {
$contentId = $protoSlot->getContentId();
} else {
$contentId = $this->insertContentRowOn( $protoSlot, $dbw, $blobAddress );
}
$this->insertSlotRowOn( $protoSlot, $dbw, $revisionId, $contentId );
return SlotRecord::newSaved(
$revisionId,
$contentId,
$blobAddress,
$protoSlot
);
}
/**
* Insert IP revision into ip_changes for use when querying for a range.
* @param IDatabase $dbw
* @param UserIdentity $user
* @param RevisionRecord $rev
* @param int $revisionId
*/
private function insertIpChangesRow(
IDatabase $dbw,
UserIdentity $user,
RevisionRecord $rev,
$revisionId
) {
if ( !$user->isRegistered() && IPUtils::isValid( $user->getName() ) ) {
$dbw->newInsertQueryBuilder()
->insertInto( 'ip_changes' )
->row( [
'ipc_rev_id' => $revisionId,
'ipc_rev_timestamp' => $dbw->timestamp( $rev->getTimestamp() ),
'ipc_hex' => IPUtils::toHex( $user->getName() ),
] )
->caller( __METHOD__ )->execute();
}
}
/**
* @param IDatabase $dbw
* @param RevisionRecord $rev
* @param int $parentId
*
* @return array a revision table row
*
* @throws MWException
* @throws MWUnknownContentModelException
*/
private function insertRevisionRowOn(
IDatabase $dbw,
RevisionRecord $rev,
$parentId
) {
$revisionRow = $this->getBaseRevisionRow( $dbw, $rev, $parentId );
$revisionRow += $this->commentStore->insert(
$dbw,
'rev_comment',
$rev->getComment( RevisionRecord::RAW )
);
$dbw->newInsertQueryBuilder()
->insertInto( 'revision' )
->row( $revisionRow )
->caller( __METHOD__ )->execute();
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->newSelectQueryBuilder()
->select( 'MAX(ar_rev_id)' )
->from( 'archive' )
->caller( __METHOD__ )
->fetchField() );
$table = 'archive';
$maxRevId2 = intval( $dbw->newSelectQueryBuilder()
->select( 'MAX(slot_revision_id)' )
->from( 'slots' )
->caller( __METHOD__ )
->fetchField() );
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(
static fn () => $dbw->unlock( 'fix-for-T202032', $fname ),
__METHOD__
);
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'revision' )
->where( [ 'rev_id' => $revisionRow['rev_id'] ] )
->caller( __METHOD__ )->execute();
// 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',
__METHOD__
)->fetchObject();
$row2 = $dbw->query(
$dbw->selectSQLText( 'slots', [ 'v' => "MAX(slot_revision_id)" ], '', __METHOD__ )
. ' FOR UPDATE',
__METHOD__
)->fetchObject();
$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->newInsertQueryBuilder()
->insertInto( 'revision' )
->row( $revisionRow )
->caller( __METHOD__ )->execute();
}
}
}
return $revisionRow;
}
/**
* @param IDatabase $dbw
* @param RevisionRecord $rev
* @param int $parentId
*
* @return array a revision table row
*/
private function getBaseRevisionRow(
IDatabase $dbw,
RevisionRecord $rev,
$parentId
) {
// Record the edit in revisions
$revisionRow = [
'rev_page' => $rev->getPageId( $this->wikiId ),
'rev_parent_id' => $parentId,
'rev_actor' => $this->actorStore->acquireActorId(
$rev->getUser( RevisionRecord::RAW ),
$dbw
),
'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( $this->wikiId ) !== null ) {
// Needed to restore revisions with their original ID
$revisionRow['rev_id'] = $rev->getId( $this->wikiId );
}
return $revisionRow;
}
/**
* @param SlotRecord $slot
* @param PageIdentity $page
* @param array $blobHints See the BlobStore::XXX_HINT constants
*
* @throws MWException
* @return string the blob address
*/
private function storeContentBlob(
SlotRecord $slot,
PageIdentity $page,
array $blobHints = []
) {
$content = $slot->getContent();
$format = $content->getDefaultFormat();
$model = $content->getModel();
$this->checkContent( $content, $page, $slot->getRole() );
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 ) {
$dbw->newInsertQueryBuilder()
->insertInto( 'slots' )
->row( [
'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,
] )
->caller( __METHOD__ )->execute();
}
/**
* @param SlotRecord $slot
* @param IDatabase $dbw
* @param string $blobAddress
* @return int content row ID
*/
private function insertContentRowOn( SlotRecord $slot, IDatabase $dbw, $blobAddress ) {
$dbw->newInsertQueryBuilder()
->insertInto( 'content' )
->row( [
'content_size' => $slot->getSize(),
'content_sha1' => $slot->getSha1(),
'content_model' => $this->contentModelStore->acquireId( $slot->getModel() ),
'content_address' => $blobAddress,
] )
->caller( __METHOD__ )->execute();
return intval( $dbw->insertId() );
}
/**
* MCR migration note: this corresponded to Revision::checkContentModel
*
* @param Content $content
* @param PageIdentity $page
* @param string $role
*
* @throws MWException
* @throws MWUnknownContentModelException
*/
private function checkContent( Content $content, PageIdentity $page, string $role ) {
// Note: may return null for revisions that have not yet been inserted
$model = $content->getModel();
$format = $content->getDefaultFormat();
$handler = $content->getContentHandler();
if ( !$handler->isSupportedFormat( $format ) ) {
throw new MWException(
"Can't use format $format with content model $model on $page role $role"
);
}
if ( !$content->isValid() ) {
throw new MWException(
"New content for $page role $role 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 replaced Revision::newNullRevision
*
* @deprecated since 1.44, use PageUpdater::saveDummyRevision() instead.
*
* @param IDatabase $dbw used for obtaining the lock on the page table row
* @param PageIdentity $page the page to read from
* @param CommentStoreComment $comment RevisionRecord's summary
* @param bool $minor Whether the revision should be considered as minor
* @param UserIdentity $user The user to attribute the revision to
*
* @return RevisionRecord|null RevisionRecord or null on error
*/
public function newNullRevision(
IDatabase $dbw,
PageIdentity $page,
CommentStoreComment $comment,
$minor,
UserIdentity $user
) {
$this->checkDatabaseDomain( $dbw );
$pageId = $this->getArticleId( $page );
// 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->newSelectQueryBuilder()
->select( 'page_latest' )
->forUpdate()
->from( 'page' )
->where( [ 'page_id' => $pageId ] )
->caller( __METHOD__ )->fetchField();
if ( !$pageLatest ) {
$msg = 'T235589: Failed to select table row during null revision creation' .
" Page id '$pageId' does not exist.";
$this->logger->error(
$msg,
[ 'exception' => new RuntimeException( $msg ) ]
);
return null;
}
// Fetch the actual revision row from primary DB, without locking all extra tables.
$oldRevision = $this->loadRevisionFromConds(
$dbw,
[ 'rev_id' => intval( $pageLatest ) ],
IDBAccessObject::READ_LATEST,
$page
);
if ( !$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 = MWTimestamp::now( TS_MW );
$newRevision = MutableRevisionRecord::newFromParentRevision( $oldRevision );
$newRevision->setComment( $comment );
$newRevision->setUser( $user );
$newRevision->setTimestamp( $timestamp );
$newRevision->setMinorEdit( $minor );
return $newRevision;
}
/**
* MCR migration note: this replaced 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 replaced Revision::getRecentChange
*
* @todo move this somewhere else?
*
* @param RevisionRecord $rev
* @param int $flags (optional) $flags include:
* IDBAccessObject::READ_LATEST: Select the data from the primary DB
*
* @return null|RecentChange
*/
public function getRecentChange( RevisionRecord $rev, $flags = 0 ) {
if ( $this->wikiId !== RevisionRecord::LOCAL ) {
throw new PreconditionException( 'RecentChangeLookup is only available for the local wiki' );
}
$rc = $this->recentChangeLookup->getRecentChangeByConds(
[
'rc_this_oldid' => $rev->getId( $this->wikiId ),
// rc_this_oldid does not have to be unique,
// in particular, it is shared with categorization
// changes. Prefer the original change because callers
// often expect a change for patrolling.
'rc_source' => [ RecentChange::SRC_EDIT, RecentChange::SRC_NEW, RecentChange::SRC_LOG ],
],
__METHOD__,
( $flags & IDBAccessObject::READ_LATEST ) == IDBAccessObject::READ_LATEST
);
// XXX: cache this locally? Glue it to the RevisionRecord?
return $rc;
}
/**
* 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 corresponded 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 contrast 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,
?string $blobData = null,
?string $blobFlags = null,
?string $blobFormat = null,
int $queryFlags = 0
) {
if ( $blobData !== null ) {
$blobAddress = $slot->hasAddress() ? $slot->getAddress() : null;
if ( $blobFlags === null ) {
// No blob flags, so use the blob verbatim.
$data = $blobData;
} else {
try {
$data = $this->blobStore->expandBlob( $blobData, $blobFlags, $blobAddress );
} catch ( BadBlobException $e ) {
throw new BadRevisionException( $e->getMessage(), [], 0, $e );
}
if ( $data === false ) {
throw new RevisionAccessException(
'Failed to expand blob data using flags {flags} (key: {cache_key})',
[
'flags' => $blobFlags,
'cache_key' => $blobAddress,
]
);
}
}
} else {
$address = $slot->getAddress();
try {
$data = $this->blobStore->getBlob( $address, $queryFlags );
} catch ( BadBlobException $e ) {
throw new BadRevisionException( $e->getMessage(), [], 0, $e );
} catch ( BlobAccessException $e ) {
throw new RevisionAccessException(
'Failed to load data blob from {address} for revision {revision}. '
. 'If this problem persists, use the findBadBlobs maintenance script '
. 'to investigate the issue and mark the bad blobs.',
[ 'address' => $e->getMessage(), 'revision' => $slot->getRevision() ],
0,
$e
);
}
}
$model = $slot->getModel();
// If the content model is not known, don't fail here (T220594, T220793, T228921)
if ( !$this->contentHandlerFactory->isDefinedModel( $model ) ) {
$this->logger->warning(
"Undefined content model '$model', falling back to FallbackContent",
[
'content_address' => $slot->getAddress(),
'rev_id' => $slot->getRevision(),
'role_name' => $slot->getRole(),
'model_name' => $model,
'exception' => new RuntimeException()
]
);
return new FallbackContent( $data, $model );
}
return $this->contentHandlerFactory
->getContentHandler( $model )
->unserializeContent( $data, $blobFormat );
}
/**
* Load a page revision from a given revision ID number.
* Returns null if no such revision can be found.
*
* MCR migration note: this replaced Revision::newFromId
*
* $flags include:
* IDBAccessObject::READ_LATEST: Select the data from the primary DB
* IDBAccessObject::READ_LOCKING : Select & lock the data from the primary DB
*
* @param int $id
* @param int $flags (optional)
* @param PageIdentity|null $page The page the revision belongs to.
* Providing the page may improve performance.
*
* @return RevisionRecord|null
*/
public function getRevisionById( $id, $flags = 0, ?PageIdentity $page = null ) {
return $this->newRevisionFromConds( [ 'rev_id' => intval( $id ) ], $flags, $page );
}
/**
* 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 replaced Revision::newFromTitle
*
* $flags include:
* IDBAccessObject::READ_LATEST: Select the data from the primary DB
* IDBAccessObject::READ_LOCKING : Select & lock the data from the primary DB
*
* @param LinkTarget|PageIdentity $page Calling with LinkTarget is deprecated since 1.36
* @param int $revId (optional)
* @param int $flags Bitfield (optional)
* @return RevisionRecord|null
*/
public function getRevisionByTitle( $page, $revId = 0, $flags = 0 ) {
$conds = $this->getPageConditions( $page );
if ( !$conds ) {
return null;
}
if ( !( $page instanceof PageIdentity ) ) {
wfDeprecated( __METHOD__ . ' with a LinkTarget', '1.45' );
$page = null;
}
if ( $revId ) {
// Use the specified revision ID.
// Note that we use newRevisionFromConds here because we want to retry
// and fall back to primary DB 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, $page );
} 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 primary DB. 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';
return $this->loadRevisionFromConds( $db, $conds, $flags, $page );
}
}
/**
* 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 replaced Revision::newFromPageId
*
* $flags include:
* IDBAccessObject::READ_LATEST: Select the data from the primary DB (since 1.20)
* IDBAccessObject::READ_LOCKING : Select & lock the data from the primary DB
*
* @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 primary DB 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 primary DB. 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';
return $this->loadRevisionFromConds( $db, $conds, $flags );
}
}
/**
* 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 replaced Revision::loadFromTimestamp
*
* @param LinkTarget|PageIdentity $page Calling with LinkTarget is deprecated since 1.36
* @param string $timestamp
* @param int $flags Bitfield (optional) include:
* IDBAccessObject::READ_LATEST: Select the data from the primary DB
* IDBAccessObject::READ_LOCKING: Select & lock the data from the primary DB
* Default: IDBAccessObject::READ_NORMAL
* @return RevisionRecord|null
*/
public function getRevisionByTimestamp(
$page,
string $timestamp,
int $flags = IDBAccessObject::READ_NORMAL
): ?RevisionRecord {
$conds = $this->getPageConditions( $page );
if ( !$conds ) {
return null;
}
if ( !( $page instanceof PageIdentity ) ) {
wfDeprecated( __METHOD__ . ' with a LinkTarget', '1.45' );
$page = null;
}
$db = $this->getDBConnectionRefForQueryFlags( $flags );
$conds['rev_timestamp'] = $db->timestamp( $timestamp );
return $this->newRevisionFromConds( $conds, $flags, $page );
}
/**
* @param int $revId The revision to load slots for.
* @param int $queryFlags
* @param PageIdentity $page
*
* @return SlotRecord[]
*/
private function loadSlotRecords( $revId, $queryFlags, PageIdentity $page ) {
// TODO: Find a way to add NS_MODULE from Scribunto here
if ( $page->getNamespace() !== NS_TEMPLATE ) {
$res = $this->loadSlotRecordsFromDb( $revId, $queryFlags, $page );
return $this->constructSlotRecords( $revId, $res, $queryFlags, $page );
}
// TODO: These caches should not be needed. See T297147#7563670
$res = $this->localCache->getWithSetCallback(
$this->localCache->makeKey(
'revision-slots',
$page->getWikiId(),
$page->getId( $page->getWikiId() ),
$revId
),
$this->localCache::TTL_HOUR,
function () use ( $revId, $queryFlags, $page ) {
return $this->cache->getWithSetCallback(
$this->cache->makeKey(
'revision-slots',
$page->getWikiId(),
$page->getId( $page->getWikiId() ),
$revId
),
WANObjectCache::TTL_DAY,
function () use ( $revId, $queryFlags, $page ) {
$res = $this->loadSlotRecordsFromDb( $revId, $queryFlags, $page );
if ( !$res ) {
// Avoid caching
return false;
}
return $res;
}
);
}
);
if ( !$res ) {
$res = [];
}
return $this->constructSlotRecords( $revId, $res, $queryFlags, $page );
}
private function loadSlotRecordsFromDb( int $revId, int $queryFlags, PageIdentity $page ): array {
$revQuery = $this->getSlotsQueryInfo( [ 'content' ] );
$db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
$res = $db->newSelectQueryBuilder()
->queryInfo( $revQuery )
->where( [ 'slot_revision_id' => $revId ] )
->recency( $queryFlags )
->caller( __METHOD__ )->fetchResultSet();
if ( !$res->numRows() && !( $queryFlags & IDBAccessObject::READ_LATEST ) ) {
// If we found no slots, try looking on the primary database (T212428, T252156)
$this->logger->info(
__METHOD__ . ' falling back to READ_LATEST.',
[
'revid' => $revId,
'exception' => new RuntimeException(),
]
);
return $this->loadSlotRecordsFromDb(
$revId,
$queryFlags | IDBAccessObject::READ_LATEST,
$page
);
}
return iterator_to_array( $res );
}
/**
* Factory method for SlotRecords based on known slot rows.
*
* @param int $revId The revision to load slots for.
* @param \stdClass[]|IResultWrapper $slotRows
* @param int $queryFlags
* @param PageIdentity $page
* @param array|null $slotContents a map from blobAddress to slot
* content blob or Content object.
*
* @return SlotRecord[]
*/
private function constructSlotRecords(
$revId,
$slotRows,
$queryFlags,
PageIdentity $page,
$slotContents = null
) {
$slots = [];
foreach ( $slotRows as $row ) {
// Resolve role names and model names from in-memory cache, if they were not joined in.
if ( !isset( $row->role_name ) ) {
$row->role_name = $this->slotRoleStore->getName( (int)$row->slot_role_id );
}
if ( !isset( $row->model_name ) ) {
if ( isset( $row->content_model ) ) {
$row->model_name = $this->contentModelStore->getName( (int)$row->content_model );
} else {
// We may get here if $row->model_name is set but null, perhaps because it
// came from rev_content_model, which is NULL for the default model.
$slotRoleHandler = $this->slotRoleRegistry->getRoleHandler( $row->role_name );
$row->model_name = $slotRoleHandler->getDefaultModel( $page );
}
}
// We may have a fake blob_data field from getSlotRowsForBatch(), use it!
if ( isset( $row->blob_data ) ) {
$slotContents[$row->content_address] = $row->blob_data;
}
$contentCallback = function ( SlotRecord $slot ) use ( $slotContents, $queryFlags ) {
$blob = null;
if ( isset( $slotContents[$slot->getAddress()] ) ) {
$blob = $slotContents[$slot->getAddress()];
if ( $blob instanceof Content ) {
return $blob;
}
}
return $this->loadSlotContent( $slot, $blob, null, null, $queryFlags );
};
$slots[$row->role_name] = new SlotRecord( $row, $contentCallback );
}
if ( !isset( $slots[SlotRecord::MAIN] ) ) {
$this->logger->error(
__METHOD__ . ': Main slot of revision not found in database. See T212428.',
[
'revid' => $revId,
'queryFlags' => $queryFlags,
'exception' => new RuntimeException(),
]
);
throw new RevisionAccessException(
'Main slot of revision not found in database. See T212428.'
);
}
return $slots;
}
/**
* Factory method for RevisionSlots based on a revision ID.
*
* @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 \stdClass[]|null $slotRows
* @param int $queryFlags
* @param PageIdentity $page
*
* @return RevisionSlots
*/
private function newRevisionSlots(
$revId,
$slotRows,
$queryFlags,
PageIdentity $page
) {
if ( $slotRows ) {
$slots = new RevisionSlots(
$this->constructSlotRecords( $revId, $slotRows, $queryFlags, $page )
);
} else {
$slots = new RevisionSlots( function () use( $revId, $queryFlags, $page ) {
return $this->loadSlotRecords( $revId, $queryFlags, $page );
} );
}
return $slots;
}
/**
* Make a fake RevisionRecord object from an archive table row. This is queried
* for permissions or even inserted (as in Special:Undelete)
*
* The user ID and user name may optionally be supplied using the aliases
* ar_user and ar_user_text (the names of fields which existed before
* MW 1.34).
*
* MCR migration note: this replaced Revision::newFromArchiveRow
*
* @param \stdClass $row
* @param int $queryFlags
* @param PageIdentity|null $page
* @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
*/
public function newRevisionFromArchiveRow(
$row,
$queryFlags = 0,
?PageIdentity $page = null,
array $overrides = []
) {
return $this->newRevisionFromArchiveRowAndSlots( $row, null, $queryFlags, $page, $overrides );
}
/**
* @see RevisionFactory::newRevisionFromRow
*
* MCR migration note: this replaced Revision::newFromRow
*
* @param \stdClass $row A database row generated from a query based on RevisionSelectQueryBuilder
* @param int $queryFlags
* @param PageIdentity|null $page Preloaded page object
* @param bool $fromCache if true, the returned RevisionRecord will ensure that no stale
* data is returned from getters, by querying the database as needed
* @return RevisionRecord
*/
public function newRevisionFromRow(
$row,
$queryFlags = 0,
?PageIdentity $page = null,
$fromCache = false
) {
return $this->newRevisionFromRowAndSlots( $row, null, $queryFlags, $page, $fromCache );
}
/**
* @see newRevisionFromArchiveRow()
* @since 1.35
*
* @param stdClass $row
* @param null|stdClass[]|RevisionSlots $slots
* - Database rows generated from a query based on getSlotsQueryInfo
* with the 'content' flag set. Or
* - RevisionSlots instance
* @param int $queryFlags
* @param PageIdentity|null $page
* @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
*/
public function newRevisionFromArchiveRowAndSlots(
stdClass $row,
$slots,
int $queryFlags = 0,
?PageIdentity $page = null,
array $overrides = []
) {
if ( !$page && isset( $overrides['title'] ) ) {
if ( !( $overrides['title'] instanceof PageIdentity ) ) {
throw new InvalidArgumentException( 'title field override must contain a PageIdentity object.' );
}
$page = $overrides['title'];
}
if ( $page === null ) {
if ( isset( $row->ar_namespace ) && isset( $row->ar_title ) ) {
// Represent a non-existing page.
// NOTE: The page title may be invalid by current rules (T384628).
$page = PageIdentityValue::localIdentity( 0, $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 = $this->actorStore->newActorFromRowFields(
$row->ar_user ?? null,
$row->ar_user_text ?? null,
$row->ar_actor ?? null
);
} catch ( InvalidArgumentException $ex ) {
$this->logger->warning( 'Could not load user for archive revision {rev_id}', [
'ar_rev_id' => $row->ar_rev_id,
'ar_actor' => $row->ar_actor ?? 'null',
'ar_user_text' => $row->ar_user_text ?? 'null',
'ar_user' => $row->ar_user ?? 'null',
'exception' => $ex
] );
$user = $this->actorStore->getUnknownActor();
}
$db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
// Legacy because $row may have come from self::selectFields()
$comment = $this->commentStore->getCommentLegacy( $db, 'ar_comment', $row, true );
if ( !( $slots instanceof RevisionSlots ) ) {
$slots = $this->newRevisionSlots( (int)$row->ar_rev_id, $slots, $queryFlags, $page );
}
return new RevisionArchiveRecord( $page, $user, $comment, $row, $slots, $this->wikiId );
}
/**
* @see newFromRevisionRow()
*
* @param stdClass $row A database row generated from a query based on RevisionSelectQueryBuilder
* @param null|stdClass[]|RevisionSlots $slots
* - Database rows generated from a query based on getSlotsQueryInfo
* with the 'content' flag set. Or
* - RevisionSlots instance
* @param int $queryFlags
* @param PageIdentity|null $page
* @param bool $fromCache if true, the returned RevisionRecord will ensure that no stale
* data is returned from getters, by querying the database as needed
*
* @return RevisionRecord
* @throws RevisionAccessException
* @see RevisionFactory::newRevisionFromRow
*/
public function newRevisionFromRowAndSlots(
stdClass $row,
$slots,
int $queryFlags = 0,
?PageIdentity $page = null,
bool $fromCache = false
) {
if ( !$page ) {
if ( isset( $row->page_id )
&& isset( $row->page_namespace )
&& isset( $row->page_title )
) {
$page = new PageIdentityValue(
(int)$row->page_id,
(int)$row->page_namespace,
$row->page_title,
$this->wikiId
);
$page = $this->wrapPage( $page );
} else {
$pageId = (int)( $row->rev_page ?? 0 );
$revId = (int)( $row->rev_id ?? 0 );
$page = $this->getPage( $pageId, $revId, $queryFlags );
}
} else {
$page = $this->ensureRevisionRowMatchesPage( $row, $page );
}
if ( !$page ) {
// This should already have been caught about, but apparently
// it not always is, see T286877.
throw new RevisionAccessException(
"Failed to determine page associated with revision {$row->rev_id}"
);
}
try {
$user = $this->actorStore->newActorFromRowFields(
$row->rev_user ?? null,
$row->rev_user_text ?? null,
$row->rev_actor ?? null
);
} catch ( InvalidArgumentException $ex ) {
$this->logger->warning( 'Could not load user for revision {rev_id}', [
'rev_id' => $row->rev_id,
'rev_actor' => $row->rev_actor ?? 'null',
'rev_user_text' => $row->rev_user_text ?? 'null',
'rev_user' => $row->rev_user ?? 'null',
'exception' => $ex
] );
$user = $this->actorStore->getUnknownActor();
}
$db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
// Legacy because $row may have come from self::selectFields()
$comment = $this->commentStore->getCommentLegacy( $db, 'rev_comment', $row, true );
if ( !( $slots instanceof RevisionSlots ) ) {
$slots = $this->newRevisionSlots( (int)$row->rev_id, $slots, $queryFlags, $page );
}
// If this is a cached row, instantiate a cache-aware RevisionRecord to avoid stale data.
if ( $fromCache ) {
$rev = new RevisionStoreCacheRecord(
function ( $revId ) use ( $queryFlags ) {
$db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
$row = $this->fetchRevisionRowFromConds(
$db,
[ 'rev_id' => intval( $revId ) ]
);
if ( !$row && !( $queryFlags & IDBAccessObject::READ_LATEST ) ) {
// If we found no slots, try looking on the primary database (T259738)
$this->logger->info(
'RevisionStoreCacheRecord refresh callback falling back to READ_LATEST.',
[
'revid' => $revId,
'exception' => new RuntimeException(),
]
);
$dbw = $this->getDBConnectionRefForQueryFlags( IDBAccessObject::READ_LATEST );
$row = $this->fetchRevisionRowFromConds(
$dbw,
[ 'rev_id' => intval( $revId ) ]
);
}
if ( !$row ) {
return [ null, null ];
}
return [
$row->rev_deleted,
$this->actorStore->newActorFromRowFields(
$row->rev_user ?? null,
$row->rev_user_text ?? null,
$row->rev_actor ?? null
)
];
},
$page, $user, $comment, $row, $slots, $this->wikiId
);
} else {
$rev = new RevisionStoreRecord(
$page, $user, $comment, $row, $slots, $this->wikiId );
}
return $rev;
}
/**
* Check that the given row matches the given Title object.
* When a mismatch is detected, this tries to re-load the title from primary DB,
* to avoid spurious errors during page moves.
*
* @param \stdClass $row
* @param PageIdentity $page
* @param array $context
*
* @return Pageidentity
*/
private function ensureRevisionRowMatchesPage( $row, PageIdentity $page, $context = [] ) {
$revId = (int)( $row->rev_id ?? 0 );
$revPageId = (int)( $row->rev_page ?? 0 ); // XXX: also check $row->page_id?
$expectedPageId = $page->getId( $this->wikiId );
// Avoid fatal error when the Title's ID changed, T246720
if ( $revPageId && $expectedPageId && $revPageId !== $expectedPageId ) {
// NOTE: PageStore::getPageByReference may use the page ID, which we don't want here.
$pageRec = $this->pageStore->getPageByName(
$page->getNamespace(),
$page->getDBkey(),
IDBAccessObject::READ_LATEST
);
$masterPageId = $pageRec->getId( $this->wikiId );
$masterLatest = $pageRec->getLatest( $this->wikiId );
if ( $revPageId === $masterPageId ) {
if ( $page instanceof Title ) {
// If we were using a Title object, keep using it, but update the page ID.
// This way, we don't unexpectedly mix Titles with immutable value objects.
$page->resetArticleID( $masterPageId );
} else {
$page = $pageRec;
}
$this->logger->info(
"Encountered stale Title object",
[
'page_id_stale' => $expectedPageId,
'page_id_reloaded' => $masterPageId,
'page_latest' => $masterLatest,
'rev_id' => $revId,
'exception' => new RuntimeException(),
] + $context
);
} else {
$expectedTitle = (string)$page;
if ( $page instanceof Title ) {
// If we started with a Title, keep using a Title.
$page = $this->titleFactory->newFromID( $revPageId );
} else {
$page = $pageRec;
}
// This could happen if a caller to e.g. getRevisionById supplied a Title that is
// plain wrong. In this case, we should ideally throw an IllegalArgumentException.
// However, it is more likely that we encountered a race condition during a page
// move (T268910, T279832) or database corruption (T263340). That situation
// should not be ignored, but we can allow the request to continue in a reasonable
// manner without breaking things for the user.
$this->logger->error(
"Encountered mismatching Title object (see T259022, T268910, T279832, T263340)",
[
'expected_page_id' => $masterPageId,
'expected_page_title' => $expectedTitle,
'rev_page' => $revPageId,
'rev_page_title' => (string)$page,
'page_latest' => $masterLatest,
'rev_id' => $revId,
'exception' => new RuntimeException(),
] + $context
);
}
}
// @phan-suppress-next-line PhanTypeMismatchReturnNullable getPageByName/newFromID should not return null
return $page;
}
/**
* Construct a RevisionRecord instance for each row in $rows,
* and return them as an associative array indexed by revision ID.
* Use RevisionSelectQueryBuilder or getArchiveQueryInfo() to construct the
* query that produces the rows.
*
* @param IResultWrapper|\stdClass[] $rows the rows to construct revision records from
* @param array $options Supports the following options:
* 'slots' - whether metadata about revision slots should be
* loaded immediately. Supports falsy or truthy value as well
* as an explicit list of slot role names. The main slot will
* always be loaded.
* 'content' - whether the actual content of the slots should be
* preloaded.
* 'archive' - whether the rows where generated using getArchiveQueryInfo(),
* rather than getQueryInfo.
* @param int $queryFlags
* @param PageIdentity|null $page The page to which all the revision rows belong, if there
* is such a page and the caller has it handy, so we don't have to look it up again.
* If this parameter is given and any of the rows has a rev_page_id that is different
* from Article Id associated with the page, an InvalidArgumentException is thrown.
*
* @return StatusValue<array<int,?RevisionRecord>> a status with an array of successfully fetched revisions
* (keyed by revision IDs) and with warnings for the revisions failed to fetch.
*/
public function newRevisionsFromBatch(
$rows,
array $options = [],
$queryFlags = 0,
?PageIdentity $page = null
) {
$result = new StatusValue();
$archiveMode = $options['archive'] ?? false;
if ( $archiveMode ) {
$revIdField = 'ar_rev_id';
} else {
$revIdField = 'rev_id';
}
$rowsByRevId = [];
$pageIdsToFetchTitles = [];
$titlesByPageKey = [];
foreach ( $rows as $row ) {
if ( isset( $rowsByRevId[$row->$revIdField] ) ) {
$result->warning(
'internalerror_info',
"Duplicate rows in newRevisionsFromBatch, $revIdField {$row->$revIdField}"
);
}
// Attach a page key to the row, so we can find and reuse Title objects easily.
$row->_page_key =
$archiveMode ? $row->ar_namespace . ':' . $row->ar_title : $row->rev_page;
if ( $page ) {
if ( !$archiveMode && $row->rev_page != $this->getArticleId( $page ) ) {
throw new InvalidArgumentException(
"Revision {$row->$revIdField} doesn't belong to page "
. $this->getArticleId( $page )
);
}
if ( $archiveMode
&& ( $row->ar_namespace != $page->getNamespace()
|| $row->ar_title !== $page->getDBkey() )
) {
throw new InvalidArgumentException(
"Revision {$row->$revIdField} doesn't belong to page "
. $page
);
}
} elseif ( !isset( $titlesByPageKey[ $row->_page_key ] ) ) {
if ( isset( $row->page_namespace ) && isset( $row->page_title )
// This should always be true, but just in case we don't have a page_id
// set or it doesn't match rev_page, let's fetch the title again.
&& isset( $row->page_id ) && isset( $row->rev_page )
&& $row->rev_page === $row->page_id
) {
$titlesByPageKey[ $row->_page_key ] = Title::newFromRow( $row );
} elseif ( $archiveMode ) {
// Can't look up deleted pages by ID, but we have namespace and title
$titlesByPageKey[ $row->_page_key ] =
Title::makeTitle( $row->ar_namespace, $row->ar_title );
} else {
$pageIdsToFetchTitles[] = $row->rev_page;
}
}
$rowsByRevId[$row->$revIdField] = $row;
}
if ( !$rowsByRevId ) {
$result->setResult( true, [] );
return $result;
}
// If the page is not supplied, batch-fetch Title objects.
if ( $page ) {
// same logic as for $row->_page_key above
$pageKey = $archiveMode
? $page->getNamespace() . ':' . $page->getDBkey()
: $this->getArticleId( $page );
$titlesByPageKey[$pageKey] = $page;
} elseif ( $pageIdsToFetchTitles ) {
// Note: when we fetch titles by ID, the page key is also the ID.
// We should never get here if $archiveMode is true.
Assert::invariant( !$archiveMode, 'Titles are not loaded by ID in archive mode.' );
$pageIdsToFetchTitles = array_unique( $pageIdsToFetchTitles );
$pageRecords = $this->pageStore
->newSelectQueryBuilder()
->wherePageIds( $pageIdsToFetchTitles )
->caller( __METHOD__ )
->fetchPageRecordArray();
// Cannot array_merge because it re-indexes entries
$titlesByPageKey = $pageRecords + $titlesByPageKey;
}
// which method to use for creating RevisionRecords
$newRevisionRecord = $archiveMode
? $this->newRevisionFromArchiveRowAndSlots( ... )
: $this->newRevisionFromRowAndSlots( ... );
if ( !isset( $options['slots'] ) ) {
$result->setResult(
true,
array_map(
static function ( $row )
use ( $queryFlags, $titlesByPageKey, $result, $newRevisionRecord, $revIdField ) {
try {
if ( !isset( $titlesByPageKey[$row->_page_key] ) ) {
$result->warning(
'internalerror_info',
"Couldn't find title for rev {$row->$revIdField} "
. "(page key {$row->_page_key})"
);
return null;
}
return $newRevisionRecord( $row, null, $queryFlags,
$titlesByPageKey[ $row->_page_key ] );
} catch ( MWException $e ) {
$result->warning( 'internalerror_info', $e->getMessage() );
return null;
}
},
$rowsByRevId
)
);
return $result;
}
$slotRowOptions = [
'slots' => $options['slots'] ?? true,
'blobs' => $options['content'] ?? false,
];
if ( is_array( $slotRowOptions['slots'] )
&& !in_array( SlotRecord::MAIN, $slotRowOptions['slots'] )
) {
// Make sure the main slot is always loaded, RevisionRecord requires this.
$slotRowOptions['slots'][] = SlotRecord::MAIN;
}
$slotRowsStatus = $this->getSlotRowsForBatch( $rowsByRevId, $slotRowOptions, $queryFlags );
$result->merge( $slotRowsStatus );
$slotRowsByRevId = $slotRowsStatus->getValue();
$result->setResult(
true,
array_map(
function ( $row )
use ( $slotRowsByRevId, $queryFlags, $titlesByPageKey, $result,
$revIdField, $newRevisionRecord
) {
if ( !isset( $slotRowsByRevId[$row->$revIdField] ) ) {
$result->warning(
'internalerror_info',
"Couldn't find slots for rev {$row->$revIdField}"
);
return null;
}
if ( !isset( $titlesByPageKey[$row->_page_key] ) ) {
$result->warning(
'internalerror_info',
"Couldn't find title for rev {$row->$revIdField} "
. "(page key {$row->_page_key})"
);
return null;
}
try {
return $newRevisionRecord(
$row,
new RevisionSlots(
$this->constructSlotRecords(
$row->$revIdField,
$slotRowsByRevId[$row->$revIdField],
$queryFlags,
$titlesByPageKey[$row->_page_key]
)
),
$queryFlags,
$titlesByPageKey[$row->_page_key]
);
} catch ( MWException $e ) {
$result->warning( 'internalerror_info', $e->getMessage() );
return null;
}
},
$rowsByRevId
)
);
return $result;
}
/**
* Gets the slot rows associated with a batch of revisions.
* The serialized content of each slot can be included by setting the 'blobs' option.
* Callers are responsible for unserializing and interpreting the content blobs
* based on the model_name and role_name fields.
*
* @param Traversable|array $rowsOrIds list of revision ids, or revision or archive rows
* from a db query.
* @param array{slots?: string[], blobs?: bool} $options Supports the following options:
* 'slots' - a list of slot role names to fetch. If omitted or true or null,
* all slots are fetched
* 'blobs' - whether the serialized content of each slot should be loaded.
* If true, the serialized content will be present in the slot row
* in the blob_data field.
* @param int $queryFlags
*
* @return StatusValue<array<int,array<string,stdClass>>>
* a status containing, if isOK() returns true, a two-level nested
* associative array, mapping from revision ID to an associative array that maps from
* role name to a database row object. The database row object will contain the fields
* defined by getSlotQueryInfo() with the 'content' flag set, plus the blob_data field
* if the 'blobs' is set in $options. The model_name and role_name fields will also be
* set.
*/
private function getSlotRowsForBatch(
$rowsOrIds,
array $options = [],
$queryFlags = 0
) {
$result = new StatusValue();
$revIds = [];
foreach ( $rowsOrIds as $id ) {
if ( $id instanceof stdClass ) {
$id = $id->ar_rev_id ?? $id->rev_id;
}
$revIds[] = (int)$id;
}
// Nothing to do.
// Note that $rowsOrIds may not be "empty" even if $revIds is, e.g. if it's a ResultWrapper.
if ( !$revIds ) {
$result->setResult( true, [] );
return $result;
}
// We need to set the `content` flag to join in content meta-data
$slotQueryInfo = $this->getSlotsQueryInfo( [ 'content' ] );
$revIdField = $slotQueryInfo['keys']['rev_id'];
$slotQueryConds = [ $revIdField => $revIds ];
if ( isset( $options['slots'] ) && is_array( $options['slots'] ) ) {
$slotIds = [];
foreach ( $options['slots'] as $slot ) {
try {
$slotIds[] = $this->slotRoleStore->getId( $slot );
} catch ( NameTableAccessException ) {
// Do not fail when slot has no id (unused slot)
// This also means for this slot are never data in the database
}
}
if ( $slotIds === [] ) {
// Degenerate case: return no slots for each revision.
$result->setResult( true, array_fill_keys( $revIds, [] ) );
return $result;
}
$roleIdField = $slotQueryInfo['keys']['role_id'];
$slotQueryConds[$roleIdField] = $slotIds;
}
$db = $this->getDBConnectionRefForQueryFlags( $queryFlags );
$slotRows = $db->newSelectQueryBuilder()
->queryInfo( $slotQueryInfo )
->where( $slotQueryConds )
->caller( __METHOD__ )
->fetchResultSet();
$slotContents = null;
if ( $options['blobs'] ?? false ) {
$blobAddresses = [];
foreach ( $slotRows as $slotRow ) {
$blobAddresses[] = $slotRow->content_address;
}
$slotContentFetchStatus = $this->blobStore
->getBlobBatch( $blobAddresses, $queryFlags );
foreach ( $slotContentFetchStatus->getMessages() as $msg ) {
$result->warning( $msg );
}
$slotContents = $slotContentFetchStatus->getValue();
}
$slotRowsByRevId = [];
foreach ( $slotRows as $slotRow ) {
if ( $slotContents === null ) {
// nothing to do
} elseif ( isset( $slotContents[$slotRow->content_address] ) ) {
$slotRow->blob_data = $slotContents[$slotRow->content_address];
} else {
$result->warning(
'internalerror_info',
"Couldn't find blob data for rev {$slotRow->slot_revision_id}"
);
$slotRow->blob_data = null;
}
// conditional needed for SCHEMA_COMPAT_READ_OLD
if ( !isset( $slotRow->role_name ) && isset( $slotRow->slot_role_id ) ) {
$slotRow->role_name = $this->slotRoleStore->getName( (int)$slotRow->slot_role_id );
}
// conditional needed for SCHEMA_COMPAT_READ_OLD
if ( !isset( $slotRow->model_name ) && isset( $slotRow->content_model ) ) {
$slotRow->model_name = $this->contentModelStore->getName( (int)$slotRow->content_model );
}
$slotRowsByRevId[$slotRow->slot_revision_id][$slotRow->role_name] = $slotRow;
}
$result->setResult( true, $slotRowsByRevId );
return $result;
}
/**
* Gets raw (serialized) content blobs for the given set of revisions.
* Callers are responsible for unserializing and interpreting the content blobs
* based on the model_name field and the slot role.
*
* This method is intended for bulk operations in maintenance scripts.
* It may be chosen over newRevisionsFromBatch by code that are only interested
* in raw content, as opposed to meta data. Code that needs to access meta data of revisions,
* slots, or content objects should use newRevisionsFromBatch() instead.
*
* @param Traversable|array $rowsOrIds list of revision ids, or revision rows from a db query.
* @param string[]|null $slots the role names for which to get slots.
* @param int $queryFlags
*
* @return StatusValue<array<int,array<string,stdClass>>>
* a status containing, if isOK() returns true, a two-level nested
* associative array, mapping from revision ID to an associative array that maps from
* role name to an anonymous object containing two fields:
* - model_name: the name of the content's model
* - blob_data: serialized content data
*/
public function getContentBlobsForBatch(
$rowsOrIds,
$slots = null,
$queryFlags = 0
) {
$result = $this->getSlotRowsForBatch(
$rowsOrIds,
[ 'slots' => $slots, 'blobs' => true ],
$queryFlags
);
if ( $result->isOK() ) {
// strip out all internal meta data that we don't want to expose
foreach ( $result->value as $revId => $rowsByRole ) {
foreach ( $rowsByRole as $role => $slotRow ) {
if ( is_array( $slots ) && !in_array( $role, $slots ) ) {
// In SCHEMA_COMPAT_READ_OLD mode we may get the main slot even
// if we didn't ask for it.
unset( $result->value[$revId][$role] );
continue;
}
$result->value[$revId][$role] = (object)[
'blob_data' => $slotRow->blob_data,
'model_name' => $slotRow->model_name,
];
}
}
}
return $result;
}
/**
* 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 primary database.
*
* MCR migration note: this corresponded to Revision::newFromConds
*
* @param array $conditions
* @param int $flags (optional)
* @param PageIdentity|null $page (optional)
* @param array $options (optional) additional query options
*
* @return RevisionRecord|null
*/
private function newRevisionFromConds(
array $conditions,
int $flags = IDBAccessObject::READ_NORMAL,
?PageIdentity $page = null,
array $options = []
) {
$db = $this->getDBConnectionRefForQueryFlags( $flags );
$rev = $this->loadRevisionFromConds( $db, $conditions, $flags, $page, $options );
// Make sure new pending/committed revision are visible later on
// within web requests to certain avoid bugs like T93866 and T94407.
if ( !$rev
&& !( $flags & IDBAccessObject::READ_LATEST )
&& $this->loadBalancer->hasStreamingReplicaServers()
&& $this->loadBalancer->hasOrMadeRecentPrimaryChanges()
) {
$flags = IDBAccessObject::READ_LATEST;
$dbw = $this->getPrimaryConnection();
$rev = $this->loadRevisionFromConds( $dbw, $conditions, $flags, $page, $options );
}
return $rev;
}
/**
* Given a set of conditions, fetch a revision from
* the given database connection.
*
* MCR migration note: this corresponded to Revision::loadFromConds
*
* @param IReadableDatabase $db
* @param array $conditions
* @param int $flags (optional)
* @param PageIdentity|null $page (optional) additional query options
* @param array $options (optional) additional query options
*
* @return RevisionRecord|null
*/
private function loadRevisionFromConds(
IReadableDatabase $db,
array $conditions,
int $flags = IDBAccessObject::READ_NORMAL,
?PageIdentity $page = null,
array $options = []
) {
$row = $this->fetchRevisionRowFromConds( $db, $conditions, $flags, $options );
if ( $row ) {
return $this->newRevisionFromRow( $row, $flags, $page );
}
return null;
}
/**
* Throws an exception if the given database connection does not belong to the wiki this
* RevisionStore is bound to.
*/
private function checkDatabaseDomain( IReadableDatabase $db ) {
$dbDomain = $db->getDomainID();
$storeDomain = $this->loadBalancer->resolveDomainID( $this->wikiId );
if ( $dbDomain === $storeDomain ) {
return;
}
throw new RuntimeException( "DB connection domain '$dbDomain' does not match '$storeDomain'" );
}
/**
* Given a set of conditions, return a row with the
* fields necessary to build RevisionRecord objects.
*
* MCR migration note: this corresponded to Revision::fetchFromConds
*
* @param IReadableDatabase $db
* @param array $conditions
* @param int $flags (optional)
* @param array $options (optional) additional query options
*
* @return \stdClass|false data row as a raw object
*/
private function fetchRevisionRowFromConds(
IReadableDatabase $db,
array $conditions,
int $flags = IDBAccessObject::READ_NORMAL,
array $options = []
) {
$this->checkDatabaseDomain( $db );
$queryBuilder = $this->newSelectQueryBuilder( $db )
->joinComment()
->joinPage()
->joinUser()
->where( $conditions )
->options( $options );
if ( ( $flags & IDBAccessObject::READ_LOCKING ) == IDBAccessObject::READ_LOCKING ) {
$queryBuilder->forUpdate();
}
return $queryBuilder->caller( __METHOD__ )->fetchRow();
}
/**
* Return the tables, fields, and join conditions to be selected to create
* a new RevisionStoreRecord object.
*
* MCR migration note: this replaced 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
* @deprecated since 1.41 use RevisionStore::newSelectQueryBuilder() instead.
*
* @param array $options Any combination of the following strings
* - 'page': Join with the page table, and select fields to identify the page
* - 'user': Join with the user table, and select the user name
*
* @return array[] With three keys:
* - tables: (string[]) to include in the `$table` to `IDatabase->select()` or `SelectQueryBuilder::tables`
* - fields: (string[]) to include in the `$vars` to `IDatabase->select()` or `SelectQueryBuilder::fields`
* - joins: (array) to include in the `$join_conds` to `IDatabase->select()` or `SelectQueryBuilder::joinConds`
* @phan-return array{tables:string[],fields:string[],joins:array}
*/
public function getQueryInfo( $options = [] ) {
$ret = [
'tables' => [
'revision',
'actor_rev_user' => 'actor',
],
'fields' => [
'rev_id',
'rev_page',
'rev_actor' => 'rev_actor',
'rev_user' => 'actor_rev_user.actor_user',
'rev_user_text' => 'actor_rev_user.actor_name',
'rev_timestamp',
'rev_minor_edit',
'rev_deleted',
'rev_len',
'rev_parent_id',
'rev_sha1',
],
'joins' => [
'actor_rev_user' => [ 'JOIN', "actor_rev_user.actor_id = rev_actor" ],
]
];
$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'] );
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'] = [ 'JOIN', [ 'page_id = rev_page' ] ];
}
if ( in_array( 'user', $options, true ) ) {
$ret['tables'][] = 'user';
$ret['fields'][] = 'user_name';
$ret['joins']['user'] = [
'LEFT JOIN',
[ 'actor_rev_user.actor_user != 0', 'user_id = actor_rev_user.actor_user' ]
];
}
if ( in_array( 'text', $options, true ) ) {
throw new InvalidArgumentException(
'The `text` option is no longer supported in MediaWiki 1.35 and later.'
);
}
return $ret;
}
/**
* @inheritDoc
*/
public function newSelectQueryBuilder( IReadableDatabase $dbr ): RevisionSelectQueryBuilder {
return new RevisionSelectQueryBuilder( $dbr );
}
/**
* @inheritDoc
*/
public function newArchiveSelectQueryBuilder( IReadableDatabase $dbr ): ArchiveSelectQueryBuilder {
return new ArchiveSelectQueryBuilder( $dbr );
}
/**
* 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()` or `SelectQueryBuilder::tables`
* - fields: (string[]) to include in the `$vars` to `IDatabase->select()` or `SelectQueryBuilder::fields`
* - joins: (array) to include in the `$join_conds` to `IDatabase->select()` or `SelectQueryBuilder::joinConds`
* - keys: (associative array) to look up fields to match against.
* In particular, the field that can be used to find slots by rev_id
* can be found in ['keys']['rev_id'].
* @phan-return array{tables:string[],fields:string[],joins:array,keys:array}
*/
public function getSlotsQueryInfo( $options = [] ) {
$ret = [
'tables' => [],
'fields' => [],
'joins' => [],
'keys' => [],
];
$ret['keys']['rev_id'] = 'slot_revision_id';
$ret['keys']['role_id'] = 'slot_role_id';
$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['keys']['model_id'] = 'content_model';
$ret['tables'][] = 'content';
$ret['fields'] = array_merge( $ret['fields'], [
'content_size',
'content_sha1',
'content_address',
'content_model',
] );
$ret['joins']['content'] = [ '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;
}
/**
* Determine whether the parameter is a row containing all the fields
* that RevisionStore needs to create a RevisionRecord from the row.
*
* @param mixed $row
* @param string $table 'archive' or empty
* @return bool
*/
public function isRevisionRow( $row, string $table = '' ) {
if ( !( $row instanceof stdClass ) ) {
return false;
}
$queryInfo = $table === 'archive' ? $this->getArchiveQueryInfo() : $this->getQueryInfo();
foreach ( $queryInfo['fields'] as $alias => $field ) {
$name = is_numeric( $alias ) ? $field : $alias;
if ( !property_exists( $row, $name ) ) {
return false;
}
}
return true;
}
/**
* Return the tables, fields, and join conditions to be selected to create
* a new RevisionArchiveRecord object.
*
* Since 1.34, ar_user and ar_user_text have not been present in the
* database, but they continue to be available in query results as
* aliases.
*
* MCR migration note: this replaced Revision::getArchiveQueryInfo
*
* @since 1.31
* @deprecated since 1.41 use RevisionStore::newArchiveSelectQueryBuilder() instead.
*
* @return array[] With three keys:
* - tables: (string[]) to include in the `$table` to `IDatabase->select()` or `SelectQueryBuilder::tables`
* - fields: (string[]) to include in the `$vars` to `IDatabase->select()` or `SelectQueryBuilder::fields`
* - joins: (array) to include in the `$join_conds` to `IDatabase->select()` or `SelectQueryBuilder::joinConds`
* @phan-return array{tables:string[],fields:string[],joins:array}
*/
public function getArchiveQueryInfo() {
$commentQuery = $this->commentStore->getJoin( 'ar_comment' );
$ret = [
'tables' => [
'archive',
'archive_actor' => 'actor'
] + $commentQuery['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',
'ar_actor',
'ar_user' => 'archive_actor.actor_user',
'ar_user_text' => 'archive_actor.actor_name',
] + $commentQuery['fields'],
'joins' => [
'archive_actor' => [ 'JOIN', 'actor_id=ar_actor' ]
] + $commentQuery['joins'],
];
return $ret;
}
/**
* Do a batched query for the sizes of a set of revisions.
*
* MCR migration note: this replaced 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 ) {
$dbr = $this->getReplicaConnection();
$revLens = [];
if ( !$revIds ) {
return $revLens; // empty
}
$res = $dbr->newSelectQueryBuilder()
->select( [ 'rev_id', 'rev_len' ] )
->from( 'revision' )
->where( [ 'rev_id' => $revIds ] )
->caller( __METHOD__ )->fetchResultSet();
foreach ( $res as $row ) {
$revLens[$row->rev_id] = intval( $row->rev_len );
}
return $revLens;
}
/**
* Implementation of getPreviousRevision and getNextRevision.
*
* @param RevisionRecord $rev
* @param int $flags
* @param string $dir 'next' or 'prev'
* @return RevisionRecord|null
*/
private function getRelativeRevision( RevisionRecord $rev, $flags, $dir ) {
$op = $dir === 'next' ? '>' : '<';
$sort = $dir === 'next' ? 'ASC' : 'DESC';
$revisionIdValue = $rev->getId( $this->wikiId );
if ( !$revisionIdValue || !$rev->getPageId( $this->wikiId ) ) {
// revision is unsaved or otherwise incomplete
return null;
}
if ( $rev instanceof RevisionArchiveRecord ) {
// revision is deleted, so it's not part of the page history
return null;
}
$db = $this->getDBConnectionRefForQueryFlags( $flags );
$ts = $rev->getTimestamp() ?? $this->getTimestampFromId( $revisionIdValue, $flags );
if ( $ts === false ) {
// XXX Should this be moved into getTimestampFromId?
$ts = $db->newSelectQueryBuilder()
->select( 'ar_timestamp' )
->from( 'archive' )
->where( [ 'ar_rev_id' => $revisionIdValue ] )
->caller( __METHOD__ )->fetchField();
if ( $ts === false ) {
// XXX Is this reachable? How can we have a page id but no timestamp?
return null;
}
}
$revId = $db->newSelectQueryBuilder()
->select( 'rev_id' )
->from( 'revision' )
->where( [
'rev_page' => $rev->getPageId( $this->wikiId ),
$db->buildComparison( $op, [
'rev_timestamp' => $db->timestamp( $ts ),
'rev_id' => $revisionIdValue,
] ),
] )
->orderBy( [ 'rev_timestamp', 'rev_id' ], $sort )
->ignoreIndex( 'rev_timestamp' ) // Probably needed for T159319
->caller( __METHOD__ )
->fetchField();
if ( $revId === false ) {
return null;
}
return $this->getRevisionById( intval( $revId ), $flags );
}
/**
* Get the revision before $rev in the page's history, if any.
* Will return null for the first revision but also for deleted or unsaved revisions.
*
* MCR migration note: this replaced Revision::getPrevious
*
* @see PageArchive::getPreviousRevisionRecord
*
* @param RevisionRecord $rev
* @param int $flags (optional) $flags include:
* IDBAccessObject::READ_LATEST: Select the data from the primary DB
*
* @return RevisionRecord|null
*/
public function getPreviousRevision( RevisionRecord $rev, $flags = IDBAccessObject::READ_NORMAL ) {
return $this->getRelativeRevision( $rev, $flags, 'prev' );
}
/**
* Get the revision after $rev in the page's history, if any.
* Will return null for the latest revision but also for deleted or unsaved revisions.
*
* MCR migration note: this replaced Revision::getNext
*
* @param RevisionRecord $rev
* @param int $flags (optional) $flags include:
* IDBAccessObject::READ_LATEST: Select the data from the primary DB
* @return RevisionRecord|null
*/
public function getNextRevision( RevisionRecord $rev, $flags = IDBAccessObject::READ_NORMAL ) {
return $this->getRelativeRevision( $rev, $flags, 'next' );
}
/**
* Get previous revision Id for this page_id
* This is used to populate rev_parent_id on save
*
* MCR migration note: this corresponded to Revision::getPreviousRevisionId
*
* @param IReadableDatabase $db
* @param RevisionRecord $rev
*
* @return int
*/
private function getPreviousRevisionId( IReadableDatabase $db, RevisionRecord $rev ) {
$this->checkDatabaseDomain( $db );
if ( $rev->getPageId( $this->wikiId ) === null ) {
return 0;
}
# Use page_latest if ID is not given
if ( !$rev->getId( $this->wikiId ) ) {
$prevId = $db->newSelectQueryBuilder()
->select( 'page_latest' )
->from( 'page' )
->where( [ 'page_id' => $rev->getPageId( $this->wikiId ) ] )
->caller( __METHOD__ )->fetchField();
} else {
$prevId = $db->newSelectQueryBuilder()
->select( 'rev_id' )
->from( 'revision' )
->where( [ 'rev_page' => $rev->getPageId( $this->wikiId ) ] )
->andWhere( $db->expr( 'rev_id', '<', $rev->getId( $this->wikiId ) ) )
->orderBy( 'rev_id DESC' )
->caller( __METHOD__ )->fetchField();
}
return intval( $prevId );
}
/**
* Get rev_timestamp from rev_id, without loading the rest of the row.
*
* Historically, there was an extra Title parameter that was passed before $id. This is no
* longer needed and is deprecated in 1.34.
*
* MCR migration note: this replaced Revision::getTimestampFromId
*
* @param int $id
* @param int $flags
* @return string|false False if not found
*/
public function getTimestampFromId( $id, $flags = 0 ) {
if ( $id instanceof Title ) {
// Old deprecated calling convention supported for backwards compatibility
$id = $flags;
$flags = func_num_args() > 2 ? func_get_arg( 2 ) : 0;
}
// T270149: Bail out if we know the query will definitely return false. Some callers are
// passing RevisionRecord::getId() call directly as $id which can possibly return null.
// Null $id or $id <= 0 will lead to useless query with WHERE clause of 'rev_id IS NULL'
// or 'rev_id = 0', but 'rev_id' is always greater than zero and cannot be null.
// @todo typehint $id and remove the null check
if ( $id === null || $id <= 0 ) {
return false;
}
$db = $this->getDBConnectionRefForQueryFlags( $flags );
$timestamp =
$db->newSelectQueryBuilder()
->select( 'rev_timestamp' )
->from( 'revision' )
->where( [ 'rev_id' => $id ] )
->caller( __METHOD__ )->fetchField();
return ( $timestamp !== false ) ? MWTimestamp::convert( TS_MW, $timestamp ) : false;
}
/**
* Get count of revisions per page...not very efficient
*
* MCR migration note: this replaced Revision::countByPageId
*
* @param IReadableDatabase $db
* @param int $id Page id
* @return int
*/
public function countRevisionsByPageId( IReadableDatabase $db, $id ) {
$this->checkDatabaseDomain( $db );
$row = $db->newSelectQueryBuilder()
->select( [ 'revCount' => 'COUNT(*)' ] )
->from( 'revision' )
->where( [ 'rev_page' => $id ] )
->caller( __METHOD__ )->fetchRow();
if ( $row ) {
return intval( $row->revCount );
}
return 0;
}
/**
* Get count of revisions per page...not very efficient
*
* MCR migration note: this replaced Revision::countByTitle
*
* @param IReadableDatabase $db
* @param PageIdentity $page
* @return int
*/
public function countRevisionsByTitle( IReadableDatabase $db, PageIdentity $page ) {
$id = $this->getArticleId( $page );
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 replaced 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
* had been deprecated since 1.24 (the Revision class was removed entirely in 1.37).
*
* @param IReadableDatabase $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( IReadableDatabase $db, $pageId, $userId, $since ) {
$this->checkDatabaseDomain( $db );
if ( !$userId ) {
return false;
}
$queryBuilder = $this->newSelectQueryBuilder( $db )
->where( [
'rev_page' => $pageId,
$db->expr( 'rev_timestamp', '>', $db->timestamp( $since ) )
] )
->orderBy( 'rev_timestamp', SelectQueryBuilder::SORT_ASC )
->limit( 50 );
$res = $queryBuilder->caller( __METHOD__ )->fetchResultSet();
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 replaced Revision::newKnownCurrent
*
* @param PageIdentity $page the associated page
* @param int $revId current revision of this page. Defaults to $title->getLatestRevID().
*
* @return RevisionRecord|false Returns false if missing
*/
public function getKnownCurrentRevision( PageIdentity $page, $revId = 0 ) {
$db = $this->getReplicaConnection();
$revIdPassed = $revId;
$pageId = $this->getArticleId( $page );
if ( !$pageId ) {
return false;
}
if ( !$revId ) {
if ( $page instanceof Title ) {
$revId = $page->getLatestRevID();
} else {
$pageRecord = $this->pageStore->getPageByReference( $page );
if ( $pageRecord ) {
$revId = $pageRecord->getLatest( $this->getWikiId() );
}
}
}
if ( !$revId ) {
$this->logger->warning(
'No latest revision known for page {page} even though it exists with page ID {page_id}', [
'page' => $page->__toString(),
'page_id' => $pageId,
'wiki_id' => $this->getWikiId() ?: 'local',
] );
return false;
}
// Load the row from cache if possible. If not possible, populate the cache.
// As a minor optimization, remember if this was a cache hit or miss.
// We can sometimes avoid a database query later if this is a cache miss.
$fromCache = true;
$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, $revId, &$fromCache
) {
$setOpts += Database::getCacheSetOptions( $db );
$row = $this->fetchRevisionRowFromConds( $db, [ 'rev_id' => intval( $revId ) ] );
if ( $row ) {
$fromCache = false;
}
return $row; // don't cache negatives
}
);
// Reflect revision deletion and user renames.
if ( $row ) {
$title = $this->ensureRevisionRowMatchesPage( $row, $page, [
'from_cache_flag' => $fromCache,
'page_id_initial' => $pageId,
'rev_id_used' => $revId,
'rev_id_requested' => $revIdPassed,
] );
return $this->newRevisionFromRow( $row, 0, $title, $fromCache );
} else {
return false;
}
}
/**
* Get the first revision of a given page.
*
* @since 1.35
* @param LinkTarget|PageIdentity $page Calling with LinkTarget is deprecated since 1.36
* @param int $flags
* @return RevisionRecord|null
*/
public function getFirstRevision(
$page,
int $flags = IDBAccessObject::READ_NORMAL
): ?RevisionRecord {
$conds = $this->getPageConditions( $page );
if ( !$conds ) {
return null;
}
if ( !( $page instanceof PageIdentity ) ) {
wfDeprecated( __METHOD__ . ' with a LinkTarget', '1.45' );
$page = null;
}
return $this->newRevisionFromConds( $conds, $flags, $page,
[
'ORDER BY' => [ 'rev_timestamp ASC', 'rev_id ASC' ],
'IGNORE INDEX' => [ 'revision' => 'rev_timestamp' ], // See T159319
]
);
}
/**
* 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 IReadableDatabase $db
* @param int $pageId
* @param int $revId
* @return string
*/
private function getRevisionRowCacheKey( IReadableDatabase $db, $pageId, $revId ) {
return $this->cache->makeGlobalKey(
self::ROW_CACHE_KEY,
$db->getDomainID(),
$pageId,
$revId
);
}
/**
* Asserts that if revision is provided, it's saved and belongs to the page with provided pageId.
* @param string $paramName
* @param int $pageId
* @param RevisionRecord|null $rev
*/
private function assertRevisionParameter( $paramName, $pageId, ?RevisionRecord $rev = null ) {
if ( $rev ) {
if ( $rev->getId( $this->wikiId ) === null ) {
throw new InvalidArgumentException( "Unsaved {$paramName} revision passed" );
}
if ( $rev->getPageId( $this->wikiId ) !== $pageId ) {
throw new InvalidArgumentException(
"Revision {$rev->getId( $this->wikiId )} doesn't belong to page {$pageId}"
);
}
}
}
/**
* @param LinkTarget|PageIdentity $page Calling with LinkTarget is deprecated since 1.36
* @return array|null
*/
private function getPageConditions( object $page ): ?array {
if ( $page instanceof PageIdentity ) {
return $page->exists() ? [ 'page_id' => $page->getId( $this->wikiId ) ] : null;
} else {
// Only resolve LinkTarget when operating in the context of the local wiki (T248756)
if ( $this->wikiId !== WikiAwareEntity::LOCAL ) {
throw new InvalidArgumentException( 'Cannot use non-local LinkTarget' );
}
return [
'page_namespace' => $page->getNamespace(),
'page_title' => $page->getDBkey(),
];
}
}
/**
* Converts revision limits to query conditions.
*
* @param ISQLPlatform $dbr
* @param RevisionRecord|null $old Old revision.
* If null is provided, count starting from the first revision (inclusive).
* @param RevisionRecord|null $new New revision.
* If null is provided, count until the last revision (inclusive).
* @param string|array $options Single option, or an array of options:
* RevisionStore::INCLUDE_OLD Include $old in the range; $new is excluded.
* RevisionStore::INCLUDE_NEW Include $new in the range; $old is excluded.
* RevisionStore::INCLUDE_BOTH Include both $old and $new in the range.
* @return array
*/
private function getRevisionLimitConditions(
ISQLPlatform $dbr,
?RevisionRecord $old = null,
?RevisionRecord $new = null,
$options = []
) {
$options = (array)$options;
if ( in_array( self::INCLUDE_OLD, $options ) || in_array( self::INCLUDE_BOTH, $options ) ) {
$oldCmp = '>=';
} else {
$oldCmp = '>';
}
if ( in_array( self::INCLUDE_NEW, $options ) || in_array( self::INCLUDE_BOTH, $options ) ) {
$newCmp = '<=';
} else {
$newCmp = '<';
}
$conds = [];
if ( $old ) {
$conds[] = $dbr->buildComparison( $oldCmp, [
'rev_timestamp' => $dbr->timestamp( $old->getTimestamp() ),
'rev_id' => $old->getId( $this->wikiId ),
] );
}
if ( $new ) {
$conds[] = $dbr->buildComparison( $newCmp, [
'rev_timestamp' => $dbr->timestamp( $new->getTimestamp() ),
'rev_id' => $new->getId( $this->wikiId ),
] );
}
return $conds;
}
/**
* Get IDs of revisions between the given revisions.
*
* @since 1.36
*
* @param int $pageId The id of the page
* @param RevisionRecord|null $old Old revision.
* If null is provided, count starting from the first revision (inclusive).
* @param RevisionRecord|null $new New revision.
* If null is provided, count until the last revision (inclusive).
* @param int|null $max Limit of Revisions to count, will be incremented by
* one to detect truncations.
* @param string|array $options Single option, or an array of options:
* RevisionStore::INCLUDE_OLD Include $old in the range; $new is excluded.
* RevisionStore::INCLUDE_NEW Include $new in the range; $old is excluded.
* RevisionStore::INCLUDE_BOTH Include both $old and $new in the range.
* @param string|null $order The direction in which the revisions should be sorted.
* Possible values:
* - RevisionStore::ORDER_OLDEST_TO_NEWEST
* - RevisionStore::ORDER_NEWEST_TO_OLDEST
* - null for no specific ordering (default value)
* @param int $flags
* @throws InvalidArgumentException in case either revision is unsaved or
* the revisions do not belong to the same page or unknown option is passed.
* @return int[]
*/
public function getRevisionIdsBetween(
int $pageId,
?RevisionRecord $old = null,
?RevisionRecord $new = null,
?int $max = null,
$options = [],
?string $order = null,
int $flags = IDBAccessObject::READ_NORMAL
): array {
$this->assertRevisionParameter( 'old', $pageId, $old );
$this->assertRevisionParameter( 'new', $pageId, $new );
$options = (array)$options;
$includeOld = in_array( self::INCLUDE_OLD, $options ) ||
in_array( self::INCLUDE_BOTH, $options );
$includeNew = in_array( self::INCLUDE_NEW, $options ) ||
in_array( self::INCLUDE_BOTH, $options );
// No DB query needed if old and new are the same revision.
// Can't check for consecutive revisions with 'getParentId' for a similar
// optimization as edge cases exist when there are revisions between
// a revision and it's parent. See T185167 for more details.
if ( $old && $new && $new->getId( $this->wikiId ) === $old->getId( $this->wikiId ) ) {
return $includeOld || $includeNew ? [ $new->getId( $this->wikiId ) ] : [];
}
$db = $this->getDBConnectionRefForQueryFlags( $flags );
$queryBuilder = $db->newSelectQueryBuilder()
->select( 'rev_id' )
->from( 'revision' )
->where( [
'rev_page' => $pageId,
$db->bitAnd( 'rev_deleted', RevisionRecord::DELETED_TEXT ) . ' = 0'
] )
->andWhere( $this->getRevisionLimitConditions( $db, $old, $new, $options ) );
if ( $order !== null ) {
$queryBuilder->orderBy( [ 'rev_timestamp', 'rev_id' ], $order );
}
if ( $max !== null ) {
// extra to detect truncation
$queryBuilder->limit( $max + 1 );
}
$values = $queryBuilder->caller( __METHOD__ )->fetchFieldValues();
return array_map( 'intval', $values );
}
/**
* Get the authors between the given revisions or revisions.
* Used for diffs and other things that really need it.
*
* @since 1.35
*
* @param int $pageId The id of the page
* @param RevisionRecord|null $old Old revision.
* If null is provided, count starting from the first revision (inclusive).
* @param RevisionRecord|null $new New revision.
* If null is provided, count until the last revision (inclusive).
* @param Authority|null $performer the user whose access rights to apply
* @param int|null $max Limit of Revisions to count, will be incremented to detect truncations.
* @param string|array $options Single option, or an array of options:
* RevisionStore::INCLUDE_OLD Include $old in the range; $new is excluded.
* RevisionStore::INCLUDE_NEW Include $new in the range; $old is excluded.
* RevisionStore::INCLUDE_BOTH Include both $old and $new in the range.
* @throws InvalidArgumentException in case either revision is unsaved or
* the revisions do not belong to the same page or unknown option is passed.
* @return UserIdentity[] Names of revision authors in the range
*/
public function getAuthorsBetween(
$pageId,
?RevisionRecord $old = null,
?RevisionRecord $new = null,
?Authority $performer = null,
$max = null,
$options = []
) {
$this->assertRevisionParameter( 'old', $pageId, $old );
$this->assertRevisionParameter( 'new', $pageId, $new );
$options = (array)$options;
// No DB query needed if old and new are the same revision.
// Can't check for consecutive revisions with 'getParentId' for a similar
// optimization as edge cases exist when there are revisions between
//a revision and it's parent. See T185167 for more details.
if ( $old && $new && $new->getId( $this->wikiId ) === $old->getId( $this->wikiId ) ) {
if ( !$options ) {
return [];
} elseif ( $performer ) {
return [ $new->getUser( RevisionRecord::FOR_THIS_USER, $performer ) ];
} else {
return [ $new->getUser() ];
}
}
$dbr = $this->getReplicaConnection();
$queryBuilder = $dbr->newSelectQueryBuilder()
->select( [
'rev_actor',
'rev_user' => 'revision_actor.actor_user',
'rev_user_text' => 'revision_actor.actor_name',
] )
->distinct()
->from( 'revision' )
->join( 'actor', 'revision_actor', 'revision_actor.actor_id = rev_actor' )
->where( [
'rev_page' => $pageId,
$dbr->bitAnd( 'rev_deleted', RevisionRecord::DELETED_USER ) . " = 0"
] )
->andWhere( $this->getRevisionLimitConditions( $dbr, $old, $new, $options ) )
->caller( __METHOD__ );
if ( $max !== null ) {
$queryBuilder->limit( $max + 1 );
}
return array_map(
function ( $row ) {
return $this->actorStore->newActorFromRowFields(
$row->rev_user,
$row->rev_user_text,
$row->rev_actor
);
},
iterator_to_array( $queryBuilder->fetchResultSet() )
);
}
/**
* Get the number of authors between the given revisions.
* Used for diffs and other things that really need it.
*
* @since 1.35
*
* @param int $pageId The id of the page
* @param RevisionRecord|null $old Old revision .
* If null is provided, count starting from the first revision (inclusive).
* @param RevisionRecord|null $new New revision.
* If null is provided, count until the last revision (inclusive).
* @param Authority|null $performer the user whose access rights to apply
* @param int|null $max Limit of Revisions to count, will be incremented to detect truncations.
* @param string|array $options Single option, or an array of options:
* RevisionStore::INCLUDE_OLD Include $old in the range; $new is excluded.
* RevisionStore::INCLUDE_NEW Include $new in the range; $old is excluded.
* RevisionStore::INCLUDE_BOTH Include both $old and $new in the range.
* @throws InvalidArgumentException in case either revision is unsaved or
* the revisions do not belong to the same page or unknown option is passed.
* @return int Number of revisions authors in the range.
*/
public function countAuthorsBetween(
$pageId,
?RevisionRecord $old = null,
?RevisionRecord $new = null,
?Authority $performer = null,
$max = null,
$options = []
) {
// TODO: Implement with a separate query to avoid cost of selecting unneeded fields
// and creation of UserIdentity stuff.
return count( $this->getAuthorsBetween( $pageId, $old, $new, $performer, $max, $options ) );
}
/**
* Get the number of revisions between the given revisions.
* Used for diffs and other things that really need it.
*
* @since 1.35
*
* @param int $pageId The id of the page
* @param RevisionRecord|null $old Old revision.
* If null is provided, count starting from the first revision (inclusive).
* @param RevisionRecord|null $new New revision.
* If null is provided, count until the last revision (inclusive).
* @param int|null $max Limit of Revisions to count, will be incremented to detect truncations.
* @param string|array $options Single option, or an array of options:
* RevisionStore::INCLUDE_OLD Include $old in the range; $new is excluded.
* RevisionStore::INCLUDE_NEW Include $new in the range; $old is excluded.
* RevisionStore::INCLUDE_BOTH Include both $old and $new in the range.
* @throws InvalidArgumentException in case either revision is unsaved or
* the revisions do not belong to the same page.
* @return int Number of revisions between these revisions.
*/
public function countRevisionsBetween(
$pageId,
?RevisionRecord $old = null,
?RevisionRecord $new = null,
$max = null,
$options = []
) {
$this->assertRevisionParameter( 'old', $pageId, $old );
$this->assertRevisionParameter( 'new', $pageId, $new );
// No DB query needed if old and new are the same revision.
// Can't check for consecutive revisions with 'getParentId' for a similar
// optimization as edge cases exist when there are revisions between
//a revision and it's parent. See T185167 for more details.
if ( $old && $new && $new->getId( $this->wikiId ) === $old->getId( $this->wikiId ) ) {
return 0;
}
$dbr = $this->getReplicaConnection();
$conds = [
'rev_page' => $pageId,
$dbr->bitAnd( 'rev_deleted', RevisionRecord::DELETED_TEXT ) . ' = 0',
...$this->getRevisionLimitConditions( $dbr, $old, $new, $options ),
];
if ( $max !== null ) {
return $dbr->newSelectQueryBuilder()
->select( '1' )
->from( 'revision' )
->where( $conds )
->caller( __METHOD__ )
->limit( $max + 1 ) // extra to detect truncation
->fetchRowCount();
} else {
return (int)$dbr->newSelectQueryBuilder()
->select( 'count(*)' )
->from( 'revision' )
->where( $conds )
->caller( __METHOD__ )->fetchField();
}
}
/**
* Tries to find a revision identical to $revision in $searchLimit most recent revisions
* of this page. The comparison is based on SHA1s of these revisions.
*
* @since 1.37
*
* @param RevisionRecord $revision which revision to compare to
* @param int $searchLimit How many recent revisions should be checked
*
* @return RevisionRecord|null
*/
public function findIdenticalRevision(
RevisionRecord $revision,
int $searchLimit
): ?RevisionRecord {
$revision->assertWiki( $this->wikiId );
$db = $this->getReplicaConnection();
// Build the target slot role ID => sha1 array from the provided revision
// (this is seemingly necessary *before* fetching the candidate revisions: T406027)
$searchedSlotHashes = [];
$slots = $revision->getSlots()->getPrimarySlots();
foreach ( $slots as $slot ) {
$roleId = $this->slotRoleStore->acquireId( $slot->getRole() );
$searchedSlotHashes[$roleId] = $slot->getSha1();
}
ksort( $searchedSlotHashes );
// First fetch the IDs of the most recent revisions for this page, limited by the search limit.
$candidateRevIds = $db->newSelectQueryBuilder()
->select( 'rev_id' )
->from( 'revision' )
->where( [ 'rev_page' => $revision->getPageId( $this->wikiId ) ] )
// Include 'rev_id' in the ordering in case there are multiple revs with same timestamp
->orderBy( [ 'rev_timestamp', 'rev_id' ], SelectQueryBuilder::SORT_DESC )
// T354015
->useIndex( [ 'revision' => 'rev_page_timestamp' ] )
->limit( $searchLimit )
// skip the most recent edit, we can't revert to it anyway
->offset( 1 )
->caller( __METHOD__ )
->fetchFieldValues();
if ( $candidateRevIds === [] ) {
return null;
}
// Then, for only those revisions, fetch their slot role ID => sha1 data.
$candidateRevisions = $db->newSelectQueryBuilder()
->select( [ 'slot_revision_id', 'slot_role_id', 'content_sha1' ] )
->from( 'slots' )
->join( 'content', null, 'content_id = slot_content_id' )
->where( [ 'slot_revision_id' => $candidateRevIds ] )
->caller( __METHOD__ )
->fetchResultSet();
// Build a map of candidate revisions to their slot role ID => sha1 arrays
$candidateSlotHashes = [];
foreach ( $candidateRevisions as $candidate ) {
$candidateSlotHashes[$candidate->slot_revision_id][$candidate->slot_role_id] = $candidate->content_sha1;
}
// Find the first revision that has the same slot role ID => sha1 array as the provided revision.
// We use $candidateRevIds, which are ordered by the revision timestamps, to ensure we return
// the most recent revision that matches.
$matchRevId = null;
foreach ( $candidateRevIds as $revId ) {
ksort( $candidateSlotHashes[$revId] );
if ( $candidateSlotHashes[$revId] === $searchedSlotHashes ) {
$matchRevId = $revId;
break;
}
}
$revisionRow = null;
if ( $matchRevId !== null ) {
$revisionRow = $this->newSelectQueryBuilder( $db )
->joinComment()
->where( [ 'rev_id' => $matchRevId ] )
->caller( __METHOD__ )
->fetchRow();
}
return $revisionRow ? $this->newRevisionFromRow( $revisionRow ) : null;
}
// TODO: move relevant methods from Title here, e.g. isBigDeletion, etc.
}

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