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1 | <?php |
2 | /** |
3 | * A RevisionStoreRecord loaded from the cache. |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
18 | * http://www.gnu.org/copyleft/gpl.html |
19 | * |
20 | * @file |
21 | */ |
22 | |
23 | namespace MediaWiki\Revision; |
24 | |
25 | use MediaWiki\CommentStore\CommentStoreComment; |
26 | use MediaWiki\Page\PageIdentity; |
27 | use MediaWiki\Permissions\Authority; |
28 | use MediaWiki\User\UserIdentity; |
29 | |
30 | /** |
31 | * A cached RevisionStoreRecord. Ensures that changes performed "behind the back" |
32 | * of the cache do not cause the revision record to deliver stale data. |
33 | * |
34 | * @internal |
35 | * @since 1.33 |
36 | */ |
37 | class RevisionStoreCacheRecord extends RevisionStoreRecord { |
38 | |
39 | /** |
40 | * @var null|callable ( int $revId ): [ int $rev_deleted, UserIdentity $user ] |
41 | */ |
42 | private $mCallback; |
43 | |
44 | /** |
45 | * @note Avoid calling this constructor directly. Use the appropriate methods |
46 | * in RevisionStore instead. |
47 | * |
48 | * @param callable $callback Callback for loading data. |
49 | * Signature: function ( int $revId ): [ int $rev_deleted, UserIdentity $user ] |
50 | * @param PageIdentity $page The page this RevisionRecord is associated with. |
51 | * @param UserIdentity $user |
52 | * @param CommentStoreComment $comment |
53 | * @param \stdClass $row A row from the revision table. Use RevisionStore::getQueryInfo() to build |
54 | * a query that yields the required fields. |
55 | * @param RevisionSlots $slots The slots of this revision. |
56 | * @param false|string $wikiID Relevant wiki id or self::LOCAL for the current one. |
57 | */ |
58 | public function __construct( |
59 | callable $callback, |
60 | PageIdentity $page, |
61 | UserIdentity $user, |
62 | CommentStoreComment $comment, |
63 | $row, |
64 | RevisionSlots $slots, |
65 | $wikiID = self::LOCAL |
66 | ) { |
67 | parent::__construct( $page, $user, $comment, $row, $slots, $wikiID ); |
68 | $this->mCallback = $callback; |
69 | } |
70 | |
71 | /** |
72 | * Overridden to ensure that we return a fresh value and not a cached one. |
73 | * |
74 | * @return int |
75 | */ |
76 | public function getVisibility() { |
77 | if ( $this->mCallback ) { |
78 | $this->loadFreshRow(); |
79 | } |
80 | return parent::getVisibility(); |
81 | } |
82 | |
83 | /** |
84 | * Overridden to ensure that we return a fresh value and not a cached one. |
85 | * |
86 | * @param int $audience |
87 | * @param Authority|null $performer |
88 | * |
89 | * @return UserIdentity The identity of the revision author, null if access is forbidden. |
90 | */ |
91 | public function getUser( $audience = self::FOR_PUBLIC, ?Authority $performer = null ) { |
92 | if ( $this->mCallback ) { |
93 | $this->loadFreshRow(); |
94 | } |
95 | return parent::getUser( $audience, $performer ); |
96 | } |
97 | |
98 | /** |
99 | * Load a fresh row from the database to ensure we return updated information |
100 | * |
101 | * @throws RevisionAccessException if the row could not be loaded |
102 | */ |
103 | private function loadFreshRow() { |
104 | [ $freshRevDeleted, $freshUser ] = call_user_func( $this->mCallback, $this->mId ); |
105 | |
106 | // Set to null to ensure we do not make unnecessary queries for subsequent getter calls, |
107 | // and to allow the closure to be freed. |
108 | $this->mCallback = null; |
109 | |
110 | if ( $freshRevDeleted !== null && $freshUser !== null ) { |
111 | $this->mDeleted = intval( $freshRevDeleted ); |
112 | $this->mUser = $freshUser; |
113 | } else { |
114 | throw new RevisionAccessException( |
115 | 'Unable to load fresh row for rev_id: {rev_id}', |
116 | [ 'rev_id' => $this->mId ] |
117 | ); |
118 | } |
119 | } |
120 | |
121 | } |