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<?php
/**
* A RevisionStoreRecord loaded from the cache.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Revision;
use MediaWiki\CommentStore\CommentStoreComment;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Permissions\Authority;
use MediaWiki\User\UserIdentity;
/**
* A cached RevisionStoreRecord. Ensures that changes performed "behind the back"
* of the cache do not cause the revision record to deliver stale data.
*
* @internal
* @since 1.33
*/
class RevisionStoreCacheRecord extends RevisionStoreRecord {
/**
* @var null|callable ( int $revId ): [ int $rev_deleted, UserIdentity $user ]
*/
private $mCallback;
/**
* @note Avoid calling this constructor directly. Use the appropriate methods
* in RevisionStore instead.
*
* @param callable $callback Callback for loading data.
* Signature: function ( int $revId ): [ int $rev_deleted, UserIdentity $user ]
* @param PageIdentity $page The page this RevisionRecord is associated with.
* @param UserIdentity $user
* @param CommentStoreComment $comment
* @param \stdClass $row A row from the revision table. Use RevisionStore::getQueryInfo() to build
* a query that yields the required fields.
* @param RevisionSlots $slots The slots of this revision.
* @param false|string $wikiID Relevant wiki id or self::LOCAL for the current one.
*/
public function __construct(
callable $callback,
PageIdentity $page,
UserIdentity $user,
CommentStoreComment $comment,
$row,
RevisionSlots $slots,
$wikiID = self::LOCAL
) {
parent::__construct( $page, $user, $comment, $row, $slots, $wikiID );
$this->mCallback = $callback;
}
/**
* Overridden to ensure that we return a fresh value and not a cached one.
*
* @return int
*/
public function getVisibility() {
if ( $this->mCallback ) {
$this->loadFreshRow();
}
return parent::getVisibility();
}
/**
* Overridden to ensure that we return a fresh value and not a cached one.
*
* @param int $audience
* @param Authority|null $performer
*
* @return UserIdentity The identity of the revision author, null if access is forbidden.
*/
public function getUser( $audience = self::FOR_PUBLIC, ?Authority $performer = null ) {
if ( $this->mCallback ) {
$this->loadFreshRow();
}
return parent::getUser( $audience, $performer );
}
/**
* Load a fresh row from the database to ensure we return updated information
*
* @throws RevisionAccessException if the row could not be loaded
*/
private function loadFreshRow() {
[ $freshRevDeleted, $freshUser ] = call_user_func( $this->mCallback, $this->mId );
// Set to null to ensure we do not make unnecessary queries for subsequent getter calls,
// and to allow the closure to be freed.
$this->mCallback = null;
if ( $freshRevDeleted !== null && $freshUser !== null ) {
$this->mDeleted = intval( $freshRevDeleted );
$this->mUser = $freshUser;
} else {
throw new RevisionAccessException(
'Unable to load fresh row for rev_id: {rev_id}',
[ 'rev_id' => $this->mId ]
);
}
}
}
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