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1 | <?php |
2 | /** |
3 | * Parser cache specific expiry check. |
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 | * @ingroup Parser |
22 | */ |
23 | |
24 | namespace MediaWiki\Parser; |
25 | |
26 | use MediaWiki\Json\JsonDeserializable; |
27 | use MediaWiki\Json\JsonDeserializableTrait; |
28 | use MediaWiki\Json\JsonDeserializer; |
29 | use MediaWiki\MainConfigNames; |
30 | use MediaWiki\MediaWikiServices; |
31 | use MediaWiki\Utils\MWTimestamp; |
32 | use Wikimedia\Reflection\GhostFieldAccessTrait; |
33 | |
34 | /** |
35 | * Parser cache specific expiry check. |
36 | * |
37 | * @ingroup Parser |
38 | */ |
39 | class CacheTime implements ParserCacheMetadata, JsonDeserializable { |
40 | use GhostFieldAccessTrait; |
41 | use JsonDeserializableTrait; |
42 | |
43 | /** |
44 | * @var true[] ParserOptions which have been taken into account |
45 | * to produce output, option names stored in array keys. |
46 | */ |
47 | protected $mParseUsedOptions = []; |
48 | |
49 | /** |
50 | * @var string|int TS_MW timestamp when this object was generated, or -1 for not cacheable. Used |
51 | * in ParserCache. |
52 | */ |
53 | protected $mCacheTime = ''; |
54 | |
55 | /** |
56 | * @var int|null Seconds after which the object should expire, use 0 for not cacheable. Used in |
57 | * ParserCache. |
58 | */ |
59 | protected $mCacheExpiry = null; |
60 | |
61 | /** |
62 | * @var int|null Revision ID that was parsed |
63 | */ |
64 | protected $mCacheRevisionId = null; |
65 | |
66 | /** |
67 | * @return string|int TS_MW timestamp |
68 | */ |
69 | public function getCacheTime() { |
70 | // NOTE: keep support for undocumented used of -1 to mean "not cacheable". |
71 | if ( $this->mCacheTime === '' ) { |
72 | $this->mCacheTime = MWTimestamp::now(); |
73 | } |
74 | return $this->mCacheTime; |
75 | } |
76 | |
77 | /** |
78 | * @return bool true if a cache time has been set |
79 | */ |
80 | public function hasCacheTime(): bool { |
81 | return $this->mCacheTime !== ''; |
82 | } |
83 | |
84 | /** |
85 | * setCacheTime() sets the timestamp expressing when the page has been rendered. |
86 | * This does not control expiry, see updateCacheExpiry() for that! |
87 | * @param string $t TS_MW timestamp |
88 | * @return string |
89 | */ |
90 | public function setCacheTime( $t ) { |
91 | // NOTE: keep support for undocumented used of -1 to mean "not cacheable". |
92 | if ( is_string( $t ) && $t !== '-1' ) { |
93 | $t = MWTimestamp::convert( TS_MW, $t ); |
94 | } |
95 | |
96 | if ( $t === -1 || $t === '-1' ) { |
97 | wfDeprecatedMsg( __METHOD__ . ' called with -1 as an argument', '1.36' ); |
98 | } |
99 | |
100 | return wfSetVar( $this->mCacheTime, $t ); |
101 | } |
102 | |
103 | /** |
104 | * @since 1.23 |
105 | * @return int|null Revision id, if any was set |
106 | */ |
107 | public function getCacheRevisionId(): ?int { |
108 | return $this->mCacheRevisionId; |
109 | } |
110 | |
111 | /** |
112 | * @since 1.23 |
113 | * @param int|null $id Revision ID |
114 | */ |
115 | public function setCacheRevisionId( $id ) { |
116 | $this->mCacheRevisionId = $id; |
117 | } |
118 | |
119 | /** |
120 | * Sets the number of seconds after which this object should expire. |
121 | * |
122 | * This value is used with the ParserCache. |
123 | * If called with a value greater than the value provided at any previous call, |
124 | * the new call has no effect. The value returned by getCacheExpiry is smaller |
125 | * or equal to the smallest number that was provided as an argument to |
126 | * updateCacheExpiry(). |
127 | * |
128 | * Avoid using 0 if at all possible. Consider JavaScript for highly dynamic content. |
129 | * |
130 | * NOTE: Beware that reducing the TTL for reasons that do not relate to "dynamic content", |
131 | * may have the side-effect of incurring more RefreshLinksJob executions. |
132 | * See also WikiPage::triggerOpportunisticLinksUpdate. |
133 | * |
134 | * @param int $seconds |
135 | */ |
136 | public function updateCacheExpiry( $seconds ) { |
137 | $seconds = (int)$seconds; |
138 | |
139 | if ( $this->mCacheExpiry === null || $this->mCacheExpiry > $seconds ) { |
140 | $this->mCacheExpiry = $seconds; |
141 | } |
142 | } |
143 | |
144 | /** |
145 | * Returns the number of seconds after which this object should expire. |
146 | * This method is used by ParserCache to determine how long the ParserOutput can be cached. |
147 | * The timestamp of expiry can be calculated by adding getCacheExpiry() to getCacheTime(). |
148 | * The value returned by getCacheExpiry is smaller or equal to the smallest number |
149 | * that was provided to a call of updateCacheExpiry(), and smaller or equal to the |
150 | * value of $wgParserCacheExpireTime. |
151 | */ |
152 | public function getCacheExpiry(): int { |
153 | $parserCacheExpireTime = MediaWikiServices::getInstance()->getMainConfig() |
154 | ->get( MainConfigNames::ParserCacheExpireTime ); |
155 | |
156 | // NOTE: keep support for undocumented used of -1 to mean "not cacheable". |
157 | if ( $this->mCacheTime !== '' && $this->mCacheTime < 0 ) { |
158 | return 0; |
159 | } |
160 | |
161 | $expire = min( $this->mCacheExpiry ?? $parserCacheExpireTime, $parserCacheExpireTime ); |
162 | return $expire > 0 ? $expire : 0; |
163 | } |
164 | |
165 | /** |
166 | * @return bool |
167 | */ |
168 | public function isCacheable() { |
169 | return $this->getCacheExpiry() > 0; |
170 | } |
171 | |
172 | /** |
173 | * Return true if this cached output object predates the global or |
174 | * per-article cache invalidation timestamps, or if it comes from |
175 | * an incompatible older version. |
176 | * |
177 | * @param string $touched The affected article's last touched timestamp |
178 | * @return bool |
179 | */ |
180 | public function expired( $touched ) { |
181 | $cacheEpoch = MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::CacheEpoch ); |
182 | |
183 | $expiry = MWTimestamp::convert( TS_MW, MWTimestamp::time() - $this->getCacheExpiry() ); |
184 | |
185 | return !$this->isCacheable() // parser says it's not cacheable |
186 | || $this->getCacheTime() < $touched |
187 | || $this->getCacheTime() <= $cacheEpoch |
188 | || $this->getCacheTime() < $expiry; // expiry period has passed |
189 | } |
190 | |
191 | /** |
192 | * Return true if this cached output object is for a different revision of |
193 | * the page. |
194 | * |
195 | * @todo We always return false if $this->getCacheRevisionId() is null; |
196 | * this prevents invalidating the whole parser cache when this change is |
197 | * deployed. Someday that should probably be changed. |
198 | * |
199 | * @since 1.23 |
200 | * @param int $id The affected article's current revision id |
201 | * @return bool |
202 | */ |
203 | public function isDifferentRevision( $id ) { |
204 | $cached = $this->getCacheRevisionId(); |
205 | return $cached !== null && $id !== $cached; |
206 | } |
207 | |
208 | /** |
209 | * Returns the options from its ParserOptions which have been taken |
210 | * into account to produce the output. |
211 | * @since 1.36 |
212 | * @return string[] |
213 | */ |
214 | public function getUsedOptions(): array { |
215 | return array_keys( $this->mParseUsedOptions ); |
216 | } |
217 | |
218 | /** |
219 | * Tags a parser option for use in the cache key for this parser output. |
220 | * Registered as a watcher at ParserOptions::registerWatcher() by Parser::clearState(). |
221 | * The information gathered here is available via getUsedOptions(), |
222 | * and is used by ParserCache::save(). |
223 | * |
224 | * @see ParserCache::getMetadata |
225 | * @see ParserCache::save |
226 | * @see ParserOptions::addExtraKey |
227 | * @see ParserOptions::optionsHash |
228 | * @param string $option |
229 | */ |
230 | public function recordOption( string $option ) { |
231 | $this->mParseUsedOptions[$option] = true; |
232 | } |
233 | |
234 | /** |
235 | * Tags a list of parser option names for use in the cache key for this parser output. |
236 | * |
237 | * @see recordOption() |
238 | * @param string[] $options |
239 | */ |
240 | public function recordOptions( array $options ) { |
241 | $this->mParseUsedOptions = array_merge( |
242 | $this->mParseUsedOptions, |
243 | array_fill_keys( $options, true ) |
244 | ); |
245 | } |
246 | |
247 | /** |
248 | * Returns a JSON serializable structure representing this CacheTime instance. |
249 | * @see newFromJson() |
250 | * |
251 | * @return array |
252 | */ |
253 | protected function toJsonArray(): array { |
254 | // WARNING: When changing how this class is serialized, follow the instructions |
255 | // at <https://www.mediawiki.org/wiki/Manual:Parser_cache/Serialization_compatibility>! |
256 | |
257 | return [ |
258 | 'ParseUsedOptions' => $this->mParseUsedOptions, |
259 | 'CacheExpiry' => $this->mCacheExpiry, |
260 | 'CacheTime' => $this->mCacheTime, |
261 | 'CacheRevisionId' => $this->mCacheRevisionId, |
262 | ]; |
263 | } |
264 | |
265 | public static function newFromJsonArray( JsonDeserializer $deserializer, array $json ) { |
266 | $cacheTime = new CacheTime(); |
267 | $cacheTime->initFromJson( $deserializer, $json ); |
268 | return $cacheTime; |
269 | } |
270 | |
271 | /** |
272 | * Initialize member fields from an array returned by jsonSerialize(). |
273 | * @param JsonDeserializer $deserializer Unused |
274 | * @param array $jsonData |
275 | */ |
276 | protected function initFromJson( JsonDeserializer $deserializer, array $jsonData ) { |
277 | // WARNING: When changing how this class is serialized, follow the instructions |
278 | // at <https://www.mediawiki.org/wiki/Manual:Parser_cache/Serialization_compatibility>! |
279 | |
280 | if ( array_key_exists( 'AccessedOptions', $jsonData ) ) { |
281 | // Backwards compatibility for ParserOutput |
282 | $this->mParseUsedOptions = $jsonData['AccessedOptions'] ?: []; |
283 | } elseif ( array_key_exists( 'UsedOptions', $jsonData ) ) { |
284 | // Backwards compatibility |
285 | $this->recordOptions( $jsonData['UsedOptions'] ?: [] ); |
286 | } else { |
287 | $this->mParseUsedOptions = $jsonData['ParseUsedOptions'] ?: []; |
288 | } |
289 | $this->mCacheExpiry = $jsonData['CacheExpiry']; |
290 | $this->mCacheTime = $jsonData['CacheTime']; |
291 | $this->mCacheRevisionId = $jsonData['CacheRevisionId']; |
292 | } |
293 | |
294 | public function __wakeup() { |
295 | // Backwards compatibility, pre 1.36 |
296 | $priorOptions = $this->getGhostFieldValue( 'mUsedOptions' ); |
297 | if ( $priorOptions ) { |
298 | $this->recordOptions( $priorOptions ); |
299 | } |
300 | } |
301 | |
302 | public function __get( $name ) { |
303 | if ( property_exists( get_called_class(), $name ) ) { |
304 | // Direct access to a public property, deprecated. |
305 | wfDeprecatedMsg( "CacheTime::{$name} public read access deprecated", '1.38' ); |
306 | return $this->$name; |
307 | } elseif ( property_exists( $this, $name ) ) { |
308 | // Dynamic property access, deprecated. |
309 | wfDeprecatedMsg( "CacheTime::{$name} dynamic property read access deprecated", '1.38' ); |
310 | return $this->$name; |
311 | } else { |
312 | trigger_error( "Inaccessible property via __set(): $name" ); |
313 | return null; |
314 | } |
315 | } |
316 | |
317 | public function __set( $name, $value ) { |
318 | if ( property_exists( get_called_class(), $name ) ) { |
319 | // Direct access to a public property, deprecated. |
320 | wfDeprecatedMsg( "CacheTime::$name public write access deprecated", '1.38' ); |
321 | $this->$name = $value; |
322 | } else { |
323 | // Dynamic property access, deprecated. |
324 | wfDeprecatedMsg( "CacheTime::$name dynamic property write access deprecated", '1.38' ); |
325 | $this->$name = $value; |
326 | } |
327 | } |
328 | } |
329 | |
330 | /** @deprecated class alias since 1.43 */ |
331 | class_alias( CacheTime::class, 'CacheTime' ); |