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1 | <?php |
2 | /** |
3 | * Representation for a category. |
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 | * @author Simetrical |
22 | */ |
23 | |
24 | namespace MediaWiki\Category; |
25 | |
26 | use MediaWiki\Deferred\DeferredUpdates; |
27 | use MediaWiki\MediaWikiServices; |
28 | use MediaWiki\Page\PageIdentity; |
29 | use MediaWiki\Title\Title; |
30 | use MediaWiki\Title\TitleArrayFromResult; |
31 | use MediaWiki\Title\TitleFactory; |
32 | use RuntimeException; |
33 | use stdClass; |
34 | use Wikimedia\Rdbms\IConnectionProvider; |
35 | use Wikimedia\Rdbms\ReadOnlyMode; |
36 | |
37 | /** |
38 | * Category objects are immutable, strictly speaking. If you call methods that change the database, |
39 | * like to refresh link counts, the objects will be appropriately reinitialized. |
40 | * Member variables are lazy-initialized. |
41 | */ |
42 | class Category { |
43 | /** Name of the category, normalized to DB-key form */ |
44 | private $mName = null; |
45 | private $mID = null; |
46 | /** |
47 | * Category page title |
48 | * @var PageIdentity |
49 | */ |
50 | private $mPage = null; |
51 | |
52 | /** Counts of membership (cat_pages, cat_subcats, cat_files) */ |
53 | /** @var int */ |
54 | private $mPages = 0; |
55 | |
56 | /** @var int */ |
57 | private $mSubcats = 0; |
58 | |
59 | /** @var int */ |
60 | private $mFiles = 0; |
61 | |
62 | protected const LOAD_ONLY = 0; |
63 | protected const LAZY_INIT_ROW = 1; |
64 | |
65 | public const ROW_COUNT_SMALL = 100; |
66 | |
67 | public const COUNT_ALL_MEMBERS = 0; |
68 | public const COUNT_CONTENT_PAGES = 1; |
69 | |
70 | /** @var IConnectionProvider */ |
71 | private $dbProvider; |
72 | |
73 | /** @var ReadOnlyMode */ |
74 | private $readOnlyMode; |
75 | |
76 | /** @var TitleFactory */ |
77 | private $titleFactory; |
78 | |
79 | private function __construct() { |
80 | $services = MediaWikiServices::getInstance(); |
81 | $this->dbProvider = $services->getConnectionProvider(); |
82 | $this->readOnlyMode = $services->getReadOnlyMode(); |
83 | $this->titleFactory = $services->getTitleFactory(); |
84 | } |
85 | |
86 | /** |
87 | * Set up all member variables using a database query. |
88 | * @param int $mode One of (Category::LOAD_ONLY, Category::LAZY_INIT_ROW) |
89 | * @return bool True on success, false on failure. |
90 | */ |
91 | protected function initialize( $mode = self::LOAD_ONLY ) { |
92 | if ( $this->mName === null && $this->mID === null ) { |
93 | throw new RuntimeException( __METHOD__ . ' has both names and IDs null' ); |
94 | } elseif ( $this->mID === null ) { |
95 | $where = [ 'cat_title' => $this->mName ]; |
96 | } elseif ( $this->mName === null ) { |
97 | $where = [ 'cat_id' => $this->mID ]; |
98 | } else { |
99 | # Already initialized |
100 | return true; |
101 | } |
102 | |
103 | $row = $this->dbProvider->getReplicaDatabase()->newSelectQueryBuilder() |
104 | ->select( [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ] ) |
105 | ->from( 'category' ) |
106 | ->where( $where ) |
107 | ->caller( __METHOD__ )->fetchRow(); |
108 | |
109 | if ( !$row ) { |
110 | # Okay, there were no contents. Nothing to initialize. |
111 | if ( $this->mPage ) { |
112 | # If there is a page object but no record in the category table, |
113 | # treat this as an empty category. |
114 | $this->mID = false; |
115 | $this->mName = $this->mPage->getDBkey(); |
116 | $this->mPages = 0; |
117 | $this->mSubcats = 0; |
118 | $this->mFiles = 0; |
119 | |
120 | # If the page exists, call refreshCounts to add a row for it. |
121 | if ( $mode === self::LAZY_INIT_ROW && $this->mPage->exists() ) { |
122 | DeferredUpdates::addCallableUpdate( [ $this, 'refreshCounts' ] ); |
123 | } |
124 | |
125 | return true; |
126 | } else { |
127 | return false; # Fail |
128 | } |
129 | } |
130 | |
131 | $this->mID = $row->cat_id; |
132 | $this->mName = $row->cat_title; |
133 | $this->mPages = (int)$row->cat_pages; |
134 | $this->mSubcats = (int)$row->cat_subcats; |
135 | $this->mFiles = (int)$row->cat_files; |
136 | |
137 | # (T15683) If the count is negative, then 1) it's obviously wrong |
138 | # and should not be kept, and 2) we *probably* don't have to scan many |
139 | # rows to obtain the correct figure, so let's risk a one-time recount. |
140 | if ( $this->mPages < 0 || $this->mSubcats < 0 || $this->mFiles < 0 ) { |
141 | $this->mPages = max( $this->mPages, 0 ); |
142 | $this->mSubcats = max( $this->mSubcats, 0 ); |
143 | $this->mFiles = max( $this->mFiles, 0 ); |
144 | |
145 | if ( $mode === self::LAZY_INIT_ROW ) { |
146 | DeferredUpdates::addCallableUpdate( [ $this, 'refreshCounts' ] ); |
147 | } |
148 | } |
149 | |
150 | return true; |
151 | } |
152 | |
153 | /** |
154 | * Factory function. |
155 | * |
156 | * @param string $name A category name (no "Category:" prefix). It need |
157 | * not be normalized, with spaces replaced by underscores. |
158 | * @return Category|bool Category, or false on a totally invalid name |
159 | */ |
160 | public static function newFromName( $name ) { |
161 | $cat = new self(); |
162 | $title = Title::makeTitleSafe( NS_CATEGORY, $name ); |
163 | |
164 | if ( !is_object( $title ) ) { |
165 | return false; |
166 | } |
167 | |
168 | $cat->mPage = $title; |
169 | $cat->mName = $title->getDBkey(); |
170 | |
171 | return $cat; |
172 | } |
173 | |
174 | /** |
175 | * Factory function. |
176 | * |
177 | * @param PageIdentity $page Category page. Warning, no validation is performed! |
178 | * @return Category |
179 | */ |
180 | public static function newFromTitle( PageIdentity $page ): self { |
181 | $cat = new self(); |
182 | |
183 | $cat->mPage = $page; |
184 | $cat->mName = $page->getDBkey(); |
185 | |
186 | return $cat; |
187 | } |
188 | |
189 | /** |
190 | * Factory function. |
191 | * |
192 | * @param int $id A category id. Warning, no validation is performed! |
193 | * @return Category |
194 | */ |
195 | public static function newFromID( $id ) { |
196 | $cat = new self(); |
197 | $cat->mID = intval( $id ); |
198 | return $cat; |
199 | } |
200 | |
201 | /** |
202 | * Factory function, for constructing a Category object from a result set |
203 | * |
204 | * @param stdClass $row Result set row, must contain the cat_xxx fields. If the fields are |
205 | * null, the resulting Category object will represent an empty category if a page object was |
206 | * given. If the fields are null and no PageIdentity was given, this method fails and returns |
207 | * false. |
208 | * @param PageIdentity|null $page This must be provided if there is no cat_title field in $row. |
209 | * @return Category|false |
210 | */ |
211 | public static function newFromRow( stdClass $row, ?PageIdentity $page = null ) { |
212 | $cat = new self(); |
213 | $cat->mPage = $page; |
214 | |
215 | # NOTE: the row often results from a LEFT JOIN on categorylinks. This may result in |
216 | # all the cat_xxx fields being null, if the category page exists, but nothing |
217 | # was ever added to the category. This case should be treated link an empty |
218 | # category, if possible. |
219 | |
220 | if ( $row->cat_title === null ) { |
221 | if ( $page === null ) { |
222 | # the name is probably somewhere in the row, for example as page_title, |
223 | # but we can't know that here... |
224 | return false; |
225 | } else { |
226 | # if we have a PageIdentity object, fetch the category name from there |
227 | $cat->mName = $page->getDBkey(); |
228 | } |
229 | |
230 | $cat->mID = false; |
231 | $cat->mSubcats = 0; |
232 | $cat->mPages = 0; |
233 | $cat->mFiles = 0; |
234 | } else { |
235 | $cat->mName = $row->cat_title; |
236 | $cat->mID = $row->cat_id; |
237 | $cat->mSubcats = (int)$row->cat_subcats; |
238 | $cat->mPages = (int)$row->cat_pages; |
239 | $cat->mFiles = (int)$row->cat_files; |
240 | } |
241 | |
242 | return $cat; |
243 | } |
244 | |
245 | /** |
246 | * @return string|false DB key name, or false on failure |
247 | */ |
248 | public function getName() { |
249 | return $this->getX( 'mName' ); |
250 | } |
251 | |
252 | /** |
253 | * @return string|false Category ID, or false on failure |
254 | */ |
255 | public function getID() { |
256 | return $this->getX( 'mID' ); |
257 | } |
258 | |
259 | /** |
260 | * @return int Total number of members count (sum of subcats, files and pages) |
261 | */ |
262 | public function getMemberCount(): int { |
263 | $this->initialize( self::LAZY_INIT_ROW ); |
264 | |
265 | return $this->mPages; |
266 | } |
267 | |
268 | /** |
269 | * @param int $type One of self::COUNT_ALL_MEMBERS and self::COUNT_CONTENT_PAGES |
270 | * @return int Total number of member count or content page count |
271 | */ |
272 | public function getPageCount( $type = self::COUNT_ALL_MEMBERS ): int { |
273 | $allCount = $this->getMemberCount(); |
274 | |
275 | if ( $type === self::COUNT_CONTENT_PAGES ) { |
276 | return $allCount - ( $this->getSubcatCount() + $this->getFileCount() ); |
277 | } |
278 | |
279 | return $allCount; |
280 | } |
281 | |
282 | /** |
283 | * @return int Number of subcategories |
284 | */ |
285 | public function getSubcatCount(): int { |
286 | return $this->getX( 'mSubcats' ); |
287 | } |
288 | |
289 | /** |
290 | * @return int Number of member files |
291 | */ |
292 | public function getFileCount(): int { |
293 | return $this->getX( 'mFiles' ); |
294 | } |
295 | |
296 | /** |
297 | * @since 1.37 |
298 | * @return ?PageIdentity the page associated with this category, or null on failure. NOTE: This |
299 | * returns null on failure, unlike getTitle() which returns false. |
300 | */ |
301 | public function getPage(): ?PageIdentity { |
302 | if ( $this->mPage ) { |
303 | return $this->mPage; |
304 | } |
305 | |
306 | if ( !$this->initialize( self::LAZY_INIT_ROW ) ) { |
307 | return null; |
308 | } |
309 | |
310 | $this->mPage = Title::makeTitleSafe( NS_CATEGORY, $this->mName ); |
311 | return $this->mPage; |
312 | } |
313 | |
314 | /** |
315 | * @deprecated since 1.37, use getPage() instead. |
316 | * @return Title|bool Title for this category, or false on failure. |
317 | */ |
318 | public function getTitle() { |
319 | return Title::castFromPageIdentity( $this->getPage() ) ?? false; |
320 | } |
321 | |
322 | /** |
323 | * Fetch a TitleArray of up to $limit category members, beginning after the |
324 | * category sort key $offset. |
325 | * @param int|false $limit |
326 | * @param string $offset |
327 | * @return TitleArrayFromResult Title objects for category members. |
328 | */ |
329 | public function getMembers( $limit = false, $offset = '' ) { |
330 | $dbr = $this->dbProvider->getReplicaDatabase(); |
331 | $queryBuilder = $dbr->newSelectQueryBuilder(); |
332 | $queryBuilder->select( [ 'page_id', 'page_namespace', 'page_title', 'page_len', |
333 | 'page_is_redirect', 'page_latest' ] ) |
334 | ->from( 'categorylinks' ) |
335 | ->join( 'page', null, [ 'cl_from = page_id' ] ) |
336 | ->where( [ 'cl_to' => $this->getName() ] ) |
337 | ->orderBy( 'cl_sortkey' ); |
338 | |
339 | if ( $limit ) { |
340 | $queryBuilder->limit( $limit ); |
341 | } |
342 | |
343 | if ( $offset !== '' ) { |
344 | $queryBuilder->andWhere( $dbr->expr( 'cl_sortkey', '>', $offset ) ); |
345 | } |
346 | |
347 | return $this->titleFactory->newTitleArrayFromResult( |
348 | $queryBuilder->caller( __METHOD__ )->fetchResultSet() |
349 | ); |
350 | } |
351 | |
352 | /** |
353 | * Generic accessor |
354 | * @param string $key |
355 | * @return mixed |
356 | */ |
357 | private function getX( $key ) { |
358 | $this->initialize( self::LAZY_INIT_ROW ); |
359 | |
360 | return $this->{$key} ?? false; |
361 | } |
362 | |
363 | /** |
364 | * Refresh the counts for this category. |
365 | * |
366 | * @return bool True on success, false on failure |
367 | */ |
368 | public function refreshCounts() { |
369 | if ( $this->readOnlyMode->isReadOnly() ) { |
370 | return false; |
371 | } |
372 | |
373 | # If we have just a category name, find out whether there is an |
374 | # existing row. Or if we have just an ID, get the name, because |
375 | # that's what categorylinks uses. |
376 | if ( !$this->initialize( self::LOAD_ONLY ) ) { |
377 | return false; |
378 | } |
379 | |
380 | $dbw = $this->dbProvider->getPrimaryDatabase(); |
381 | # Avoid excess contention on the same category (T162121) |
382 | $name = __METHOD__ . ':' . md5( $this->mName ); |
383 | $scopedLock = $dbw->getScopedLockAndFlush( $name, __METHOD__, 0 ); |
384 | if ( !$scopedLock ) { |
385 | return false; |
386 | } |
387 | |
388 | $dbw->startAtomic( __METHOD__ ); |
389 | |
390 | // Lock the `category` row before potentially locking `categorylinks` rows to try |
391 | // to avoid deadlocks with LinksDeletionUpdate (T195397) |
392 | $dbw->newSelectQueryBuilder() |
393 | ->from( 'category' ) |
394 | ->where( [ 'cat_title' => $this->mName ] ) |
395 | ->caller( __METHOD__ ) |
396 | ->forUpdate() |
397 | ->acquireRowLocks(); |
398 | |
399 | $rowCount = $dbw->newSelectQueryBuilder() |
400 | ->select( '*' ) |
401 | ->from( 'categorylinks' ) |
402 | ->join( 'page', null, 'page_id = cl_from' ) |
403 | ->where( [ 'cl_to' => $this->mName ] ) |
404 | ->limit( 110 ) |
405 | ->caller( __METHOD__ )->fetchRowCount(); |
406 | // Only lock if there are below 100 rows (T352628) |
407 | if ( $rowCount < 100 ) { |
408 | // Lock all the `categorylinks` records and gaps for this category; |
409 | // this is a separate query due to postgres limitations |
410 | $dbw->newSelectQueryBuilder() |
411 | ->select( '*' ) |
412 | ->from( 'categorylinks' ) |
413 | ->join( 'page', null, 'page_id = cl_from' ) |
414 | ->where( [ 'cl_to' => $this->mName ] ) |
415 | ->lockInShareMode() |
416 | ->caller( __METHOD__ ) |
417 | ->acquireRowLocks(); |
418 | } |
419 | |
420 | // Get the aggregate `categorylinks` row counts for this category |
421 | $catCond = $dbw->conditional( [ 'page_namespace' => NS_CATEGORY ], '1', 'NULL' ); |
422 | $fileCond = $dbw->conditional( [ 'page_namespace' => NS_FILE ], '1', 'NULL' ); |
423 | $result = $dbw->newSelectQueryBuilder() |
424 | ->select( [ |
425 | 'pages' => 'COUNT(*)', |
426 | 'subcats' => "COUNT($catCond)", |
427 | 'files' => "COUNT($fileCond)" |
428 | ] ) |
429 | ->from( 'categorylinks' ) |
430 | ->join( 'page', null, 'page_id = cl_from' ) |
431 | ->where( [ 'cl_to' => $this->mName ] ) |
432 | ->caller( __METHOD__ )->fetchRow(); |
433 | |
434 | $shouldExist = $result->pages > 0 || $this->getPage()->exists(); |
435 | |
436 | if ( $this->mID ) { |
437 | if ( $shouldExist ) { |
438 | # The category row already exists, so do a plain UPDATE instead |
439 | # of INSERT...ON DUPLICATE KEY UPDATE to avoid creating a gap |
440 | # in the cat_id sequence. The row may or may not be "affected". |
441 | $dbw->newUpdateQueryBuilder() |
442 | ->update( 'category' ) |
443 | ->set( [ |
444 | 'cat_pages' => $result->pages, |
445 | 'cat_subcats' => $result->subcats, |
446 | 'cat_files' => $result->files |
447 | ] ) |
448 | ->where( [ 'cat_title' => $this->mName ] ) |
449 | ->caller( __METHOD__ )->execute(); |
450 | } else { |
451 | # The category is empty and has no description page, delete it |
452 | $dbw->newDeleteQueryBuilder() |
453 | ->deleteFrom( 'category' ) |
454 | ->where( [ 'cat_title' => $this->mName ] ) |
455 | ->caller( __METHOD__ )->execute(); |
456 | $this->mID = false; |
457 | } |
458 | } elseif ( $shouldExist ) { |
459 | # The category row doesn't exist but should, so create it. Use |
460 | # upsert in case of races. |
461 | $dbw->newInsertQueryBuilder() |
462 | ->insertInto( 'category' ) |
463 | ->row( [ |
464 | 'cat_title' => $this->mName, |
465 | 'cat_pages' => $result->pages, |
466 | 'cat_subcats' => $result->subcats, |
467 | 'cat_files' => $result->files |
468 | ] ) |
469 | ->onDuplicateKeyUpdate() |
470 | ->uniqueIndexFields( [ 'cat_title' ] ) |
471 | ->set( [ |
472 | 'cat_pages' => $result->pages, |
473 | 'cat_subcats' => $result->subcats, |
474 | 'cat_files' => $result->files |
475 | ] ) |
476 | ->caller( __METHOD__ )->execute(); |
477 | // @todo: Should we update $this->mID here? Or not since Category |
478 | // objects tend to be short lived enough to not matter? |
479 | } |
480 | |
481 | $dbw->endAtomic( __METHOD__ ); |
482 | |
483 | # Now we should update our local counts. |
484 | $this->mPages = (int)$result->pages; |
485 | $this->mSubcats = (int)$result->subcats; |
486 | $this->mFiles = (int)$result->files; |
487 | |
488 | return true; |
489 | } |
490 | |
491 | /** |
492 | * Call refreshCounts() if there are no entries in the categorylinks table |
493 | * or if the category table has a row that states that there are no entries |
494 | * |
495 | * Due to lock errors or other failures, the precomputed counts can get out of sync, |
496 | * making it hard to know when to delete the category row without checking the |
497 | * categorylinks table. |
498 | * |
499 | * @return bool Whether links were refreshed |
500 | * @since 1.32 |
501 | */ |
502 | public function refreshCountsIfEmpty() { |
503 | return $this->refreshCountsIfSmall( 0 ); |
504 | } |
505 | |
506 | /** |
507 | * Call refreshCounts() if there are few entries in the categorylinks table |
508 | * |
509 | * Due to lock errors or other failures, the precomputed counts can get out of sync, |
510 | * making it hard to know when to delete the category row without checking the |
511 | * categorylinks table. |
512 | * |
513 | * This method will do a non-locking select first to reduce contention. |
514 | * |
515 | * @param int $maxSize Only refresh if there are this or less many backlinks |
516 | * @return bool Whether links were refreshed |
517 | * @since 1.34 |
518 | */ |
519 | public function refreshCountsIfSmall( $maxSize = self::ROW_COUNT_SMALL ) { |
520 | $dbw = $this->dbProvider->getPrimaryDatabase(); |
521 | $dbw->startAtomic( __METHOD__ ); |
522 | |
523 | $typeOccurances = $dbw->newSelectQueryBuilder() |
524 | ->select( 'cl_type' ) |
525 | ->from( 'categorylinks' ) |
526 | ->where( [ 'cl_to' => $this->getName() ] ) |
527 | ->limit( $maxSize + 1 ) |
528 | ->caller( __METHOD__ )->fetchFieldValues(); |
529 | |
530 | if ( !$typeOccurances ) { |
531 | $doRefresh = true; // delete any category table entry |
532 | } elseif ( count( $typeOccurances ) <= $maxSize ) { |
533 | $countByType = array_count_values( $typeOccurances ); |
534 | $doRefresh = !$dbw->newSelectQueryBuilder() |
535 | ->select( '1' ) |
536 | ->from( 'category' ) |
537 | ->where( [ |
538 | 'cat_title' => $this->getName(), |
539 | 'cat_pages' => $countByType['page'] ?? 0, |
540 | 'cat_subcats' => $countByType['subcat'] ?? 0, |
541 | 'cat_files' => $countByType['file'] ?? 0 |
542 | ] ) |
543 | ->caller( __METHOD__ )->fetchField(); |
544 | } else { |
545 | $doRefresh = false; // category is too big |
546 | } |
547 | |
548 | $dbw->endAtomic( __METHOD__ ); |
549 | |
550 | if ( $doRefresh ) { |
551 | $this->refreshCounts(); // update the row |
552 | |
553 | return true; |
554 | } |
555 | |
556 | return false; |
557 | } |
558 | } |
559 | |
560 | /** @deprecated class alias since 1.40 */ |
561 | class_alias( Category::class, 'Category' ); |