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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | use MediaWiki\Http\Telemetry; |
| 22 | use MediaWiki\Json\FormatJson; |
| 23 | use MediaWiki\MediaWikiServices; |
| 24 | use MediaWiki\Page\PageReference; |
| 25 | use MediaWiki\Title\Title; |
| 26 | |
| 27 | /** |
| 28 | * Describe and execute a background job. |
| 29 | * |
| 30 | * Callers should use JobQueueGroup to enqueue jobs for deferred execution. |
| 31 | * |
| 32 | * See [the architecture doc](@ref jobqueuearch) for more information. |
| 33 | * |
| 34 | * @stable to extend |
| 35 | * @since 1.6 |
| 36 | * @ingroup JobQueue |
| 37 | */ |
| 38 | abstract class Job implements RunnableJob { |
| 39 | /** @var string */ |
| 40 | public $command; |
| 41 | |
| 42 | /** @var array Array of job parameters */ |
| 43 | public $params; |
| 44 | |
| 45 | /** @var array Additional queue metadata */ |
| 46 | public $metadata = []; |
| 47 | |
| 48 | /** @var Title */ |
| 49 | protected $title; |
| 50 | |
| 51 | /** @var bool Expensive jobs may set this to true */ |
| 52 | protected $removeDuplicates = false; |
| 53 | |
| 54 | /** @var string Text for error that occurred last */ |
| 55 | protected $error; |
| 56 | |
| 57 | /** @var callable[] */ |
| 58 | protected $teardownCallbacks = []; |
| 59 | |
| 60 | /** @var int Bitfield of JOB_* class constants */ |
| 61 | protected $executionFlags = 0; |
| 62 | |
| 63 | /** |
| 64 | * Create the appropriate object to handle a specific job |
| 65 | * |
| 66 | * @deprecated since 1.40, use JobFactory instead. |
| 67 | * |
| 68 | * @param string $command Job command |
| 69 | * @param array|PageReference $params Job parameters |
| 70 | * @return Job |
| 71 | */ |
| 72 | public static function factory( $command, $params = [] ) { |
| 73 | $factory = MediaWikiServices::getInstance()->getJobFactory(); |
| 74 | |
| 75 | // FIXME: fix handling for legacy signature! |
| 76 | // @phan-suppress-next-line PhanParamTooFewUnpack one argument is known to be present. |
| 77 | return $factory->newJob( ...func_get_args() ); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * @stable to call |
| 82 | * |
| 83 | * @param string $command |
| 84 | * @param array|PageReference|null $params |
| 85 | */ |
| 86 | public function __construct( $command, $params = null ) { |
| 87 | if ( $params instanceof PageReference ) { |
| 88 | // Backwards compatibility for old signature ($command, $title, $params) |
| 89 | $page = $params; |
| 90 | $params = func_num_args() >= 3 ? func_get_arg( 2 ) : []; |
| 91 | } else { |
| 92 | // Newer jobs may choose to not have a top-level title (e.g. GenericParameterJob) |
| 93 | $page = null; |
| 94 | } |
| 95 | |
| 96 | if ( !is_array( $params ) ) { |
| 97 | throw new InvalidArgumentException( '$params must be an array' ); |
| 98 | } |
| 99 | |
| 100 | if ( |
| 101 | $page && |
| 102 | !isset( $params['namespace'] ) && |
| 103 | !isset( $params['title'] ) |
| 104 | ) { |
| 105 | // When constructing this class for submitting to the queue, |
| 106 | // normalise the $page arg of old job classes as part of $params. |
| 107 | $params['namespace'] = $page->getNamespace(); |
| 108 | $params['title'] = $page->getDBkey(); |
| 109 | } |
| 110 | |
| 111 | $this->command = $command; |
| 112 | $this->params = $params + [ |
| 113 | 'requestId' => Telemetry::getInstance()->getRequestId(), |
| 114 | ]; |
| 115 | |
| 116 | if ( $this->title === null ) { |
| 117 | // Set this field for access via getTitle(). |
| 118 | $this->title = ( isset( $params['namespace'] ) && isset( $params['title'] ) ) |
| 119 | ? Title::makeTitle( $params['namespace'], $params['title'] ) |
| 120 | // GenericParameterJob classes without namespace/title params |
| 121 | // should not use getTitle(). Set an invalid title as placeholder. |
| 122 | : Title::makeTitle( NS_SPECIAL, '' ); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * @inheritDoc |
| 128 | * @stable to override |
| 129 | */ |
| 130 | public function hasExecutionFlag( $flag ) { |
| 131 | return ( $this->executionFlags & $flag ) === $flag; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * @inheritDoc |
| 136 | * @stable to override |
| 137 | */ |
| 138 | public function getType() { |
| 139 | return $this->command; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * @return Title |
| 144 | */ |
| 145 | final public function getTitle() { |
| 146 | return $this->title; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * @inheritDoc |
| 151 | * @stable to override |
| 152 | */ |
| 153 | public function getParams() { |
| 154 | return $this->params; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * @stable to override |
| 159 | * @param string|null $field Metadata field or null to get all the metadata |
| 160 | * @return mixed|null Value; null if missing |
| 161 | * @since 1.33 |
| 162 | */ |
| 163 | public function getMetadata( $field = null ) { |
| 164 | if ( $field === null ) { |
| 165 | return $this->metadata; |
| 166 | } |
| 167 | |
| 168 | return $this->metadata[$field] ?? null; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * @stable to override |
| 173 | * @param string $field Key name to set the value for |
| 174 | * @param mixed $value The value to set the field for |
| 175 | * @return mixed|null The prior field value; null if missing |
| 176 | * @since 1.33 |
| 177 | */ |
| 178 | public function setMetadata( $field, $value ) { |
| 179 | $old = $this->getMetadata( $field ); |
| 180 | if ( $value === null ) { |
| 181 | unset( $this->metadata[$field] ); |
| 182 | } else { |
| 183 | $this->metadata[$field] = $value; |
| 184 | } |
| 185 | |
| 186 | return $old; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * @stable to override |
| 191 | * @return int|null UNIX timestamp to delay running this job until, otherwise null |
| 192 | * @since 1.22 |
| 193 | */ |
| 194 | public function getReleaseTimestamp() { |
| 195 | $time = wfTimestampOrNull( TS_UNIX, $this->params['jobReleaseTimestamp'] ?? null ); |
| 196 | return $time ? (int)$time : null; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * @return int|null UNIX timestamp of when the job was queued, or null |
| 201 | * @since 1.26 |
| 202 | */ |
| 203 | public function getQueuedTimestamp() { |
| 204 | $time = wfTimestampOrNull( TS_UNIX, $this->metadata['timestamp'] ?? null ); |
| 205 | return $time ? (int)$time : null; |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * @inheritDoc |
| 210 | * @stable to override |
| 211 | */ |
| 212 | public function getRequestId() { |
| 213 | return $this->params['requestId'] ?? null; |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * @inheritDoc |
| 218 | * @stable to override |
| 219 | */ |
| 220 | public function getReadyTimestamp() { |
| 221 | return $this->getReleaseTimestamp() ?: $this->getQueuedTimestamp(); |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * Whether the queue should reject insertion of this job if a duplicate exists |
| 226 | * |
| 227 | * This can be used to avoid duplicated effort or combined with delayed jobs to |
| 228 | * coalesce updates into larger batches. Claimed jobs are never treated as |
| 229 | * duplicates of new jobs, and some queues may allow a few duplicates due to |
| 230 | * network partitions and fail-over. Thus, additional locking is needed to |
| 231 | * enforce mutual exclusion if this is really needed. |
| 232 | * |
| 233 | * @stable to override |
| 234 | * |
| 235 | * @return bool |
| 236 | */ |
| 237 | public function ignoreDuplicates() { |
| 238 | return $this->removeDuplicates; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * @inheritDoc |
| 243 | * @stable to override |
| 244 | */ |
| 245 | public function allowRetries() { |
| 246 | return true; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * @stable to override |
| 251 | * @return int |
| 252 | */ |
| 253 | public function workItemCount() { |
| 254 | return 1; |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Subclasses may need to override this to make duplication detection work. |
| 259 | * The resulting map conveys everything that makes the job unique. This is |
| 260 | * only checked if ignoreDuplicates() returns true, meaning that duplicate |
| 261 | * jobs are supposed to be ignored. |
| 262 | * |
| 263 | * @stable to override |
| 264 | * @return array Map of key/values |
| 265 | * @since 1.21 |
| 266 | */ |
| 267 | public function getDeduplicationInfo() { |
| 268 | $info = [ |
| 269 | 'type' => $this->getType(), |
| 270 | 'params' => $this->getParams() |
| 271 | ]; |
| 272 | if ( is_array( $info['params'] ) ) { |
| 273 | // Identical jobs with different "root" jobs should count as duplicates |
| 274 | unset( $info['params']['rootJobSignature'] ); |
| 275 | unset( $info['params']['rootJobTimestamp'] ); |
| 276 | // Likewise for jobs with different delay times |
| 277 | unset( $info['params']['jobReleaseTimestamp'] ); |
| 278 | // Identical jobs from different requests should count as duplicates |
| 279 | unset( $info['params']['requestId'] ); |
| 280 | // Queues pack and hash this array, so normalize the order |
| 281 | ksort( $info['params'] ); |
| 282 | } |
| 283 | |
| 284 | return $info; |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Get "root job" parameters for a task |
| 289 | * |
| 290 | * This is used to no-op redundant jobs, including child jobs of jobs, |
| 291 | * as long as the children inherit the root job parameters. When a job |
| 292 | * with root job parameters and "rootJobIsSelf" set is pushed, the |
| 293 | * deduplicateRootJob() method is automatically called on it. If the |
| 294 | * root job is only virtual and not actually pushed (e.g. the sub-jobs |
| 295 | * are inserted directly), then call deduplicateRootJob() directly. |
| 296 | * |
| 297 | * @see JobQueue::deduplicateRootJob() |
| 298 | * |
| 299 | * @param string $key A key that identifies the task |
| 300 | * @return array Map of: |
| 301 | * - rootJobIsSelf : true |
| 302 | * - rootJobSignature : hash (e.g. SHA1) that identifies the task |
| 303 | * - rootJobTimestamp : TS_MW timestamp of this instance of the task |
| 304 | * @since 1.21 |
| 305 | */ |
| 306 | public static function newRootJobParams( $key ) { |
| 307 | return [ |
| 308 | 'rootJobIsSelf' => true, |
| 309 | 'rootJobSignature' => sha1( $key ), |
| 310 | 'rootJobTimestamp' => wfTimestampNow() |
| 311 | ]; |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * @stable to override |
| 316 | * @see JobQueue::deduplicateRootJob() |
| 317 | * @return array |
| 318 | * @since 1.21 |
| 319 | */ |
| 320 | public function getRootJobParams() { |
| 321 | return [ |
| 322 | 'rootJobSignature' => $this->params['rootJobSignature'] ?? null, |
| 323 | 'rootJobTimestamp' => $this->params['rootJobTimestamp'] ?? null |
| 324 | ]; |
| 325 | } |
| 326 | |
| 327 | /** |
| 328 | * @stable to override |
| 329 | * @see JobQueue::deduplicateRootJob() |
| 330 | * @return bool |
| 331 | * @since 1.22 |
| 332 | */ |
| 333 | public function hasRootJobParams() { |
| 334 | return isset( $this->params['rootJobSignature'] ) |
| 335 | && isset( $this->params['rootJobTimestamp'] ); |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * @stable to override |
| 340 | * @see JobQueue::deduplicateRootJob() |
| 341 | * @return bool Whether this is job is a root job |
| 342 | */ |
| 343 | public function isRootJob() { |
| 344 | return $this->hasRootJobParams() && !empty( $this->params['rootJobIsSelf'] ); |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * @param callable $callback A function with one parameter, the success status, which will be |
| 349 | * false if the job failed or it succeeded but the DB changes could not be committed or |
| 350 | * any deferred updates threw an exception. (This parameter was added in 1.28.) |
| 351 | * @since 1.27 |
| 352 | */ |
| 353 | protected function addTeardownCallback( $callback ) { |
| 354 | $this->teardownCallbacks[] = $callback; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * @inheritDoc |
| 359 | * @stable to override |
| 360 | */ |
| 361 | public function teardown( $status ) { |
| 362 | foreach ( $this->teardownCallbacks as $callback ) { |
| 363 | call_user_func( $callback, $status ); |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * @inheritDoc |
| 369 | * @stable to override |
| 370 | */ |
| 371 | public function toString() { |
| 372 | $paramString = ''; |
| 373 | if ( $this->params ) { |
| 374 | foreach ( $this->params as $key => $value ) { |
| 375 | if ( $paramString != '' ) { |
| 376 | $paramString .= ' '; |
| 377 | } |
| 378 | if ( is_array( $value ) ) { |
| 379 | $filteredValue = []; |
| 380 | foreach ( $value as $k => $v ) { |
| 381 | $json = FormatJson::encode( $v ); |
| 382 | if ( $json === false || mb_strlen( $json ) > 512 ) { |
| 383 | $filteredValue[$k] = get_debug_type( $v ) . '(...)'; |
| 384 | } else { |
| 385 | $filteredValue[$k] = $v; |
| 386 | } |
| 387 | } |
| 388 | if ( count( $filteredValue ) <= 10 ) { |
| 389 | $value = FormatJson::encode( $filteredValue ); |
| 390 | } else { |
| 391 | $value = "array(" . count( $value ) . ")"; |
| 392 | } |
| 393 | } elseif ( is_object( $value ) && !method_exists( $value, '__toString' ) ) { |
| 394 | $value = get_debug_type( $value ); |
| 395 | } |
| 396 | |
| 397 | $flatValue = (string)$value; |
| 398 | if ( mb_strlen( $flatValue ) > 1024 ) { |
| 399 | $flatValue = "string(" . mb_strlen( $value ) . ")"; |
| 400 | } |
| 401 | |
| 402 | // Remove newline characters from the value, since |
| 403 | // newlines indicate new job lines in log files |
| 404 | $flatValue = preg_replace( '/\s+/', ' ', $flatValue ); |
| 405 | |
| 406 | $paramString .= "$key={$flatValue}"; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | $metaString = ''; |
| 411 | foreach ( $this->metadata as $key => $value ) { |
| 412 | if ( is_scalar( $value ) && mb_strlen( $value ) < 1024 ) { |
| 413 | $metaString .= ( $metaString ? ",$key=$value" : "$key=$value" ); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | $s = $this->command; |
| 418 | if ( is_object( $this->title ) ) { |
| 419 | $s .= ' ' . $this->title->getPrefixedDBkey(); |
| 420 | } |
| 421 | if ( $paramString != '' ) { |
| 422 | $s .= " $paramString"; |
| 423 | } |
| 424 | if ( $metaString != '' ) { |
| 425 | $s .= " ($metaString)"; |
| 426 | } |
| 427 | |
| 428 | return $s; |
| 429 | } |
| 430 | |
| 431 | protected function setLastError( $error ) { |
| 432 | $this->error = $error; |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * @inheritDoc |
| 437 | * @stable to override |
| 438 | */ |
| 439 | public function getLastError() { |
| 440 | return $this->error; |
| 441 | } |
| 442 | } |