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| 1 | <?php |
| 2 | /** |
| 3 | * BackupDumper that postprocesses XML dumps from dumpBackup.php to add page text |
| 4 | * |
| 5 | * Copyright (C) 2005 Brooke Vibber <bvibber@wikimedia.org> |
| 6 | * https://www.mediawiki.org/ |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 21 | * http://www.gnu.org/copyleft/gpl.html |
| 22 | * |
| 23 | * @file |
| 24 | * @ingroup Dump |
| 25 | * @ingroup Maintenance |
| 26 | */ |
| 27 | |
| 28 | namespace MediaWiki\Maintenance; |
| 29 | |
| 30 | // @codeCoverageIgnoreStart |
| 31 | require_once __DIR__ . '/BackupDumper.php'; |
| 32 | require_once __DIR__ . '/../../includes/export/WikiExporter.php'; |
| 33 | // @codeCoverageIgnoreEnd |
| 34 | |
| 35 | use BaseDump; |
| 36 | use Exception; |
| 37 | use ExportProgressFilter; |
| 38 | use MediaWiki\Exception\MWException; |
| 39 | use MediaWiki\Exception\MWUnknownContentModelException; |
| 40 | use MediaWiki\Revision\RevisionStore; |
| 41 | use MediaWiki\Revision\SlotRecord; |
| 42 | use MediaWiki\Settings\SettingsBuilder; |
| 43 | use MediaWiki\Shell\Shell; |
| 44 | use MediaWiki\Storage\BlobAccessException; |
| 45 | use MediaWiki\Storage\BlobStore; |
| 46 | use MediaWiki\Storage\SqlBlobStore; |
| 47 | use MediaWiki\WikiMap\WikiMap; |
| 48 | use MediaWiki\Xml\Xml; |
| 49 | use RuntimeException; |
| 50 | use WikiExporter; |
| 51 | use Wikimedia\AtEase\AtEase; |
| 52 | use XmlDumpWriter; |
| 53 | |
| 54 | /** |
| 55 | * @ingroup Maintenance |
| 56 | */ |
| 57 | class TextPassDumper extends BackupDumper { |
| 58 | /** @var BaseDump|null */ |
| 59 | public $prefetch = null; |
| 60 | /** @var string */ |
| 61 | private $thisPage; |
| 62 | /** @var string */ |
| 63 | private $thisRev; |
| 64 | /** @var string|null */ |
| 65 | private $thisRole = null; |
| 66 | |
| 67 | /** |
| 68 | * @var int when we spend more than maxTimeAllowed seconds on this run, we continue |
| 69 | * processing until we write out the next complete page, then save output file(s), |
| 70 | * rename it/them and open new one(s); 0 = no limit |
| 71 | */ |
| 72 | public $maxTimeAllowed = 0; |
| 73 | |
| 74 | /** @var string */ |
| 75 | protected $input = "php://stdin"; |
| 76 | /** @var int */ |
| 77 | protected $history = WikiExporter::FULL; |
| 78 | /** @var int */ |
| 79 | protected $fetchCount = 0; |
| 80 | /** @var int */ |
| 81 | protected $prefetchCount = 0; |
| 82 | /** @var int */ |
| 83 | protected $prefetchCountLast = 0; |
| 84 | /** @var int */ |
| 85 | protected $fetchCountLast = 0; |
| 86 | |
| 87 | /** @var int */ |
| 88 | protected $maxFailures = 5; |
| 89 | /** @var int */ |
| 90 | protected $maxConsecutiveFailedTextRetrievals = 200; |
| 91 | /** @var int Seconds to sleep after db failure */ |
| 92 | protected $failureTimeout = 5; |
| 93 | |
| 94 | /** @var int In bytes. Maximum size to read from the stub in on go. */ |
| 95 | protected $bufferSize = 524_288; |
| 96 | |
| 97 | /** @var array */ |
| 98 | protected $php = [ PHP_BINARY ]; |
| 99 | /** @var bool */ |
| 100 | protected $spawn = false; |
| 101 | |
| 102 | /** |
| 103 | * @var resource|false |
| 104 | */ |
| 105 | protected $spawnProc = false; |
| 106 | |
| 107 | /** |
| 108 | * @var resource|null |
| 109 | */ |
| 110 | protected $spawnWrite; |
| 111 | |
| 112 | /** |
| 113 | * @var resource|null |
| 114 | */ |
| 115 | protected $spawnRead; |
| 116 | |
| 117 | /** |
| 118 | * @var resource|false |
| 119 | */ |
| 120 | protected $spawnErr = false; |
| 121 | |
| 122 | /** |
| 123 | * @var XmlDumpWriter|false |
| 124 | */ |
| 125 | protected $xmlwriterobj = false; |
| 126 | |
| 127 | /** @var bool */ |
| 128 | protected $timeExceeded = false; |
| 129 | /** @var string|false */ |
| 130 | protected $firstPageWritten = false; |
| 131 | /** @var string|false */ |
| 132 | protected $lastPageWritten = false; |
| 133 | /** @var bool */ |
| 134 | protected $checkpointJustWritten = false; |
| 135 | /** @var string[] */ |
| 136 | protected $checkpointFiles = []; |
| 137 | |
| 138 | /** |
| 139 | * @param array|null $args For backward compatibility |
| 140 | */ |
| 141 | public function __construct( $args = null ) { |
| 142 | parent::__construct(); |
| 143 | |
| 144 | $this->addDescription( <<<TEXT |
| 145 | This script postprocesses XML dumps from dumpBackup.php to add |
| 146 | page text which was stubbed out (using --stub). |
| 147 | |
| 148 | XML input is accepted on stdin. |
| 149 | XML output is sent to stdout; progress reports are sent to stderr. |
| 150 | TEXT |
| 151 | ); |
| 152 | $this->stderr = fopen( "php://stderr", "wt" ); |
| 153 | |
| 154 | $this->addOption( 'stub', 'To load a compressed stub dump instead of stdin. ' . |
| 155 | 'Specify as --stub=<type>:<file>.', false, true ); |
| 156 | $this->addOption( 'prefetch', 'Use a prior dump file as a text source, to savepressure on the ' . |
| 157 | 'database. (Requires the XMLReader extension). Specify as --prefetch=<type>:<file>', |
| 158 | false, true ); |
| 159 | $this->addOption( 'maxtime', 'Write out checkpoint file after this many minutes (writing' . |
| 160 | 'out complete page, closing xml file properly, and opening new one' . |
| 161 | 'with header). This option requires the checkpointfile option.', false, true ); |
| 162 | $this->addOption( 'checkpointfile', 'Use this string for checkpoint filenames,substituting ' . |
| 163 | 'first pageid written for the first %s (required) and the last pageid written for the ' . |
| 164 | 'second %s if it exists.', false, true, false, true ); // This can be specified multiple times |
| 165 | $this->addOption( 'quiet', 'Don\'t dump status reports to stderr.' ); |
| 166 | $this->addOption( 'full', 'Dump all revisions of every page' ); |
| 167 | $this->addOption( 'current', 'Base ETA on number of pages in database instead of all revisions' ); |
| 168 | $this->addOption( 'spawn', 'Spawn a subprocess for loading text records, optionally specify ' . |
| 169 | 'php[,mwscript] paths' ); |
| 170 | $this->addOption( 'buffersize', 'Buffer size in bytes to use for reading the stub. ' . |
| 171 | '(Default: 512 KiB, Minimum: 4 KiB)', false, true ); |
| 172 | |
| 173 | if ( $args ) { |
| 174 | $this->loadWithArgv( $args ); |
| 175 | $this->processOptions(); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | public function finalSetup( SettingsBuilder $settingsBuilder ) { |
| 180 | parent::finalSetup( $settingsBuilder ); |
| 181 | |
| 182 | SevenZipStream::register(); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * @return BlobStore |
| 187 | */ |
| 188 | private function getBlobStore() { |
| 189 | return $this->getServiceContainer()->getBlobStore(); |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * @return RevisionStore |
| 194 | */ |
| 195 | private function getRevisionStore() { |
| 196 | return $this->getServiceContainer()->getRevisionStore(); |
| 197 | } |
| 198 | |
| 199 | public function execute() { |
| 200 | $this->processOptions(); |
| 201 | $this->dump( true ); |
| 202 | } |
| 203 | |
| 204 | protected function processOptions() { |
| 205 | parent::processOptions(); |
| 206 | |
| 207 | if ( $this->hasOption( 'buffersize' ) ) { |
| 208 | $this->bufferSize = max( intval( $this->getOption( 'buffersize' ) ), 4 * 1024 ); |
| 209 | } |
| 210 | |
| 211 | if ( $this->hasOption( 'prefetch' ) ) { |
| 212 | $url = $this->processFileOpt( $this->getOption( 'prefetch' ) ); |
| 213 | $this->prefetch = new BaseDump( $url ); |
| 214 | } |
| 215 | |
| 216 | if ( $this->hasOption( 'stub' ) ) { |
| 217 | $this->input = $this->processFileOpt( $this->getOption( 'stub' ) ); |
| 218 | } |
| 219 | |
| 220 | if ( $this->hasOption( 'maxtime' ) ) { |
| 221 | $this->maxTimeAllowed = intval( $this->getOption( 'maxtime' ) ) * 60; |
| 222 | } |
| 223 | |
| 224 | if ( $this->hasOption( 'checkpointfile' ) ) { |
| 225 | $this->checkpointFiles = $this->getOption( 'checkpointfile' ); |
| 226 | } |
| 227 | |
| 228 | if ( $this->hasOption( 'current' ) ) { |
| 229 | $this->history = WikiExporter::CURRENT; |
| 230 | } |
| 231 | |
| 232 | if ( $this->hasOption( 'full' ) ) { |
| 233 | $this->history = WikiExporter::FULL; |
| 234 | } |
| 235 | |
| 236 | if ( $this->hasOption( 'spawn' ) ) { |
| 237 | $this->spawn = true; |
| 238 | $val = $this->getOption( 'spawn' ); |
| 239 | if ( $val !== 1 ) { |
| 240 | $this->php = explode( ',', $val, 2 ); |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | public function initProgress( $history = WikiExporter::FULL ) { |
| 246 | parent::initProgress(); |
| 247 | $this->timeOfCheckpoint = $this->startTime; |
| 248 | } |
| 249 | |
| 250 | public function dump( $history, $text = WikiExporter::TEXT ) { |
| 251 | // Notice messages will foul up your XML output even if they're |
| 252 | // relatively harmless. |
| 253 | if ( ini_get( 'display_errors' ) ) { |
| 254 | ini_set( 'display_errors', 'stderr' ); |
| 255 | } |
| 256 | |
| 257 | $this->initProgress( $this->history ); |
| 258 | |
| 259 | $this->egress = new ExportProgressFilter( $this->sink, $this ); |
| 260 | |
| 261 | // it would be nice to do it in the constructor, oh well. need egress set |
| 262 | $this->finalOptionCheck(); |
| 263 | |
| 264 | // we only want this so we know how to close a stream :-P |
| 265 | $this->xmlwriterobj = new XmlDumpWriter( XmlDumpWriter::WRITE_CONTENT, $this->schemaVersion ); |
| 266 | |
| 267 | $input = fopen( $this->input, "rt" ); |
| 268 | $this->readDump( $input ); |
| 269 | |
| 270 | if ( $this->spawnProc ) { |
| 271 | $this->closeSpawn(); |
| 272 | } |
| 273 | |
| 274 | $this->report( true ); |
| 275 | } |
| 276 | |
| 277 | protected function processFileOpt( $opt ) { |
| 278 | $split = explode( ':', $opt, 2 ); |
| 279 | $val = $split[0]; |
| 280 | $param = ''; |
| 281 | if ( count( $split ) === 2 ) { |
| 282 | $param = $split[1]; |
| 283 | } |
| 284 | $fileURIs = explode( ';', $param ); |
| 285 | $newFileURIs = []; |
| 286 | foreach ( $fileURIs as $URI ) { |
| 287 | switch ( $val ) { |
| 288 | case "file": |
| 289 | $newURI = $URI; |
| 290 | break; |
| 291 | case "gzip": |
| 292 | $newURI = "compress.zlib://$URI"; |
| 293 | break; |
| 294 | case "bzip2": |
| 295 | $newURI = "compress.bzip2://$URI"; |
| 296 | break; |
| 297 | case "7zip": |
| 298 | $newURI = "mediawiki.compress.7z://$URI"; |
| 299 | break; |
| 300 | default: |
| 301 | $newURI = $URI; |
| 302 | } |
| 303 | $newFileURIs[] = $newURI; |
| 304 | } |
| 305 | $val = implode( ';', $newFileURIs ); |
| 306 | |
| 307 | return $val; |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * Overridden to include prefetch ratio if enabled. |
| 312 | */ |
| 313 | public function showReport() { |
| 314 | if ( !$this->prefetch ) { |
| 315 | parent::showReport(); |
| 316 | |
| 317 | return; |
| 318 | } |
| 319 | |
| 320 | if ( $this->reporting ) { |
| 321 | $now = wfTimestamp( TS_DB ); |
| 322 | $nowts = microtime( true ); |
| 323 | $deltaAll = $nowts - $this->startTime; |
| 324 | $deltaPart = $nowts - $this->lastTime; |
| 325 | $this->pageCountPart = $this->pageCount - $this->pageCountLast; |
| 326 | $this->revCountPart = $this->revCount - $this->revCountLast; |
| 327 | |
| 328 | if ( $deltaAll ) { |
| 329 | $portion = $this->revCount / $this->maxCount; |
| 330 | $eta = $this->startTime + $deltaAll / $portion; |
| 331 | $etats = wfTimestamp( TS_DB, intval( $eta ) ); |
| 332 | if ( $this->fetchCount ) { |
| 333 | $fetchRate = 100.0 * $this->prefetchCount / $this->fetchCount; |
| 334 | } else { |
| 335 | $fetchRate = '-'; |
| 336 | } |
| 337 | $pageRate = $this->pageCount / $deltaAll; |
| 338 | $revRate = $this->revCount / $deltaAll; |
| 339 | } else { |
| 340 | $pageRate = '-'; |
| 341 | $revRate = '-'; |
| 342 | $etats = '-'; |
| 343 | $fetchRate = '-'; |
| 344 | } |
| 345 | if ( $deltaPart ) { |
| 346 | if ( $this->fetchCountLast ) { |
| 347 | $fetchRatePart = 100.0 * $this->prefetchCountLast / $this->fetchCountLast; |
| 348 | } else { |
| 349 | $fetchRatePart = '-'; |
| 350 | } |
| 351 | $pageRatePart = $this->pageCountPart / $deltaPart; |
| 352 | $revRatePart = $this->revCountPart / $deltaPart; |
| 353 | } else { |
| 354 | $fetchRatePart = '-'; |
| 355 | $pageRatePart = '-'; |
| 356 | $revRatePart = '-'; |
| 357 | } |
| 358 | |
| 359 | $dbDomain = WikiMap::getCurrentWikiDbDomain()->getId(); |
| 360 | $this->progress( sprintf( |
| 361 | "%s: %s (ID %d) %d pages (%0.1f|%0.1f/sec all|curr), " |
| 362 | . "%d revs (%0.1f|%0.1f/sec all|curr), %0.1f%%|%0.1f%% " |
| 363 | . "prefetched (all|curr), ETA %s [max %d]", |
| 364 | $now, $dbDomain, $this->ID, $this->pageCount, $pageRate, |
| 365 | $pageRatePart, $this->revCount, $revRate, $revRatePart, |
| 366 | $fetchRate, $fetchRatePart, $etats, $this->maxCount |
| 367 | ) ); |
| 368 | $this->lastTime = $nowts; |
| 369 | $this->revCountLast = $this->revCount; |
| 370 | $this->prefetchCountLast = $this->prefetchCount; |
| 371 | $this->fetchCountLast = $this->fetchCount; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | private function setTimeExceeded() { |
| 376 | $this->timeExceeded = true; |
| 377 | } |
| 378 | |
| 379 | private function checkIfTimeExceeded(): bool { |
| 380 | if ( $this->maxTimeAllowed |
| 381 | && ( $this->lastTime - $this->timeOfCheckpoint > $this->maxTimeAllowed ) |
| 382 | ) { |
| 383 | return true; |
| 384 | } |
| 385 | |
| 386 | return false; |
| 387 | } |
| 388 | |
| 389 | private function finalOptionCheck() { |
| 390 | if ( ( $this->checkpointFiles && !$this->maxTimeAllowed ) |
| 391 | || ( $this->maxTimeAllowed && !$this->checkpointFiles ) |
| 392 | ) { |
| 393 | throw new RuntimeException( "Options checkpointfile and maxtime must be specified together.\n" ); |
| 394 | } |
| 395 | foreach ( $this->checkpointFiles as $checkpointFile ) { |
| 396 | $count = substr_count( $checkpointFile, "%s" ); |
| 397 | if ( $count !== 2 ) { |
| 398 | throw new RuntimeException( "Option checkpointfile must contain two '%s' " |
| 399 | . "for substitution of first and last pageids, count is $count instead, " |
| 400 | . "file is $checkpointFile.\n" ); |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | if ( $this->checkpointFiles ) { |
| 405 | $filenameList = (array)$this->egress->getFilenames(); |
| 406 | if ( count( $filenameList ) !== count( $this->checkpointFiles ) ) { |
| 407 | throw new RuntimeException( "One checkpointfile must be specified " |
| 408 | . "for each output option, if maxtime is used.\n" ); |
| 409 | } |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | /** |
| 414 | * @throws MWException Failure to parse XML input |
| 415 | * @param resource $input |
| 416 | * @return bool |
| 417 | */ |
| 418 | protected function readDump( $input ) { |
| 419 | $this->buffer = ""; |
| 420 | $this->openElement = false; |
| 421 | $this->atStart = true; |
| 422 | $this->state = ""; |
| 423 | $this->lastName = ""; |
| 424 | $this->thisPage = ""; |
| 425 | $this->thisRev = ""; |
| 426 | $this->thisRole = null; |
| 427 | $this->thisRevModel = null; |
| 428 | $this->thisRevFormat = null; |
| 429 | |
| 430 | $parser = xml_parser_create( "UTF-8" ); |
| 431 | xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, 0 ); |
| 432 | |
| 433 | xml_set_element_handler( |
| 434 | $parser, |
| 435 | [ $this, 'startElement' ], |
| 436 | [ $this, 'endElement' ] |
| 437 | ); |
| 438 | xml_set_character_data_handler( $parser, [ $this, 'characterData' ] ); |
| 439 | |
| 440 | $offset = 0; // for context extraction on error reporting |
| 441 | do { |
| 442 | if ( $this->checkIfTimeExceeded() ) { |
| 443 | $this->setTimeExceeded(); |
| 444 | } |
| 445 | $chunk = fread( $input, $this->bufferSize ); |
| 446 | if ( !xml_parse( $parser, $chunk, feof( $input ) ) ) { |
| 447 | wfDebug( "TextDumpPass::readDump encountered XML parsing error" ); |
| 448 | |
| 449 | $byte = xml_get_current_byte_index( $parser ); |
| 450 | $msg = wfMessage( 'xml-error-string', |
| 451 | 'XML import parse failure', |
| 452 | xml_get_current_line_number( $parser ), |
| 453 | xml_get_current_column_number( $parser ), |
| 454 | $byte . ( $chunk === false ? '' : ( '; "' . substr( $chunk, $byte - $offset, 16 ) . '"' ) ), |
| 455 | xml_error_string( xml_get_error_code( $parser ) ) )->escaped(); |
| 456 | |
| 457 | xml_parser_free( $parser ); |
| 458 | |
| 459 | throw new MWException( $msg ); |
| 460 | } |
| 461 | $offset += strlen( $chunk ); |
| 462 | } while ( $chunk !== false && !feof( $input ) ); |
| 463 | if ( $this->maxTimeAllowed ) { |
| 464 | $filenameList = (array)$this->egress->getFilenames(); |
| 465 | // we wrote some stuff after last checkpoint that needs renamed |
| 466 | if ( file_exists( $filenameList[0] ) ) { |
| 467 | $newFilenames = []; |
| 468 | # we might have just written the header and footer and had no |
| 469 | # pages or revisions written... perhaps they were all deleted |
| 470 | # there's no pageID 0 so we use that. the caller is responsible |
| 471 | # for deciding what to do with a file containing only the |
| 472 | # siteinfo information and the mw tags. |
| 473 | if ( !$this->firstPageWritten ) { |
| 474 | $firstPageID = str_pad( '0', 9, "0", STR_PAD_LEFT ); |
| 475 | $lastPageID = str_pad( '0', 9, "0", STR_PAD_LEFT ); |
| 476 | } else { |
| 477 | $firstPageID = str_pad( $this->firstPageWritten, 9, "0", STR_PAD_LEFT ); |
| 478 | $lastPageID = str_pad( $this->lastPageWritten, 9, "0", STR_PAD_LEFT ); |
| 479 | } |
| 480 | |
| 481 | $filenameCount = count( $filenameList ); |
| 482 | for ( $i = 0; $i < $filenameCount; $i++ ) { |
| 483 | $checkpointNameFilledIn = sprintf( $this->checkpointFiles[$i], $firstPageID, $lastPageID ); |
| 484 | $fileinfo = pathinfo( $filenameList[$i] ); |
| 485 | $newFilenames[] = $fileinfo['dirname'] . '/' . $checkpointNameFilledIn; |
| 486 | } |
| 487 | $this->egress->closeAndRename( $newFilenames ); |
| 488 | } |
| 489 | } |
| 490 | xml_parser_free( $parser ); |
| 491 | |
| 492 | return true; |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * Applies applicable export transformations to $text. |
| 497 | * |
| 498 | * @param string $text |
| 499 | * @param string $model |
| 500 | * @param string|null $format |
| 501 | * |
| 502 | * @return string |
| 503 | */ |
| 504 | private function exportTransform( $text, $model, $format = null ) { |
| 505 | try { |
| 506 | $contentHandler = $this->getServiceContainer() |
| 507 | ->getContentHandlerFactory() |
| 508 | ->getContentHandler( $model ); |
| 509 | } catch ( MWUnknownContentModelException $ex ) { |
| 510 | wfWarn( "Unable to apply export transformation for content model '$model': " . |
| 511 | $ex->getMessage() ); |
| 512 | |
| 513 | $this->progress( |
| 514 | "Unable to apply export transformation for content model '$model': " . |
| 515 | $ex->getMessage() |
| 516 | ); |
| 517 | return $text; |
| 518 | } |
| 519 | |
| 520 | return $contentHandler->exportTransform( $text, $format ); |
| 521 | } |
| 522 | |
| 523 | /** |
| 524 | * Tries to load revision text. |
| 525 | * Export transformations are applied if the content model is given or can be |
| 526 | * determined from the database. |
| 527 | * |
| 528 | * Upon errors, retries (Up to $this->maxFailures tries each call). |
| 529 | * If still no good revision could be found even after this retrying, "" is returned. |
| 530 | * If no good revision text could be returned for |
| 531 | * $this->maxConsecutiveFailedTextRetrievals consecutive calls to getText, MWException |
| 532 | * is thrown. |
| 533 | * |
| 534 | * @param int|string $id Content address, or text row ID. |
| 535 | * @param string|false|null $model The content model used to determine |
| 536 | * applicable export transformations. If $model is null, no transformation is applied. |
| 537 | * @param string|null $format The content format used when applying export transformations. |
| 538 | * @param int|null $expSize Expected length of the text, for checks |
| 539 | * |
| 540 | * @return string The revision text for $id, or "" |
| 541 | * @throws MWException |
| 542 | */ |
| 543 | protected function getText( $id, $model = null, $format = null, $expSize = null ) { |
| 544 | if ( !$this->isValidTextId( $id ) ) { |
| 545 | $msg = "Skipping bad text id " . $id . " of revision " . $this->thisRev; |
| 546 | $this->progress( $msg ); |
| 547 | return ''; |
| 548 | } |
| 549 | |
| 550 | $model = $model ?: null; |
| 551 | $prefetchNotTried = true; // Whether or not we already tried to get the text via prefetch. |
| 552 | $text = false; // The candidate for a good text. false if no proper value. |
| 553 | $failures = 0; // The number of times, this invocation of getText already failed. |
| 554 | $contentAddress = $id; // Where the content should be found |
| 555 | |
| 556 | // The number of times getText failed without yielding a good text in between. |
| 557 | static $consecutiveFailedTextRetrievals = 0; |
| 558 | |
| 559 | $this->fetchCount++; |
| 560 | |
| 561 | // To allow to simply return on success and do not have to worry about book keeping, |
| 562 | // we assume, this fetch works (possible after some retries). Nevertheless, we koop |
| 563 | // the old value, so we can restore it, if problems occur (See after the while loop). |
| 564 | $oldConsecutiveFailedTextRetrievals = $consecutiveFailedTextRetrievals; |
| 565 | $consecutiveFailedTextRetrievals = 0; |
| 566 | |
| 567 | while ( $failures < $this->maxFailures ) { |
| 568 | // As soon as we found a good text for the $id, we will return immediately. |
| 569 | // Hence, if we make it past the try catch block, we know that we did not |
| 570 | // find a good text. |
| 571 | |
| 572 | try { |
| 573 | // Step 1: Get some text (or reuse from previous iteratuon if checking |
| 574 | // for plausibility failed) |
| 575 | |
| 576 | // Trying to get prefetch, if it has not been tried before |
| 577 | // @phan-suppress-next-line PhanSuspiciousValueComparisonInLoop |
| 578 | if ( $text === false && $this->prefetch && $prefetchNotTried ) { |
| 579 | $prefetchNotTried = false; |
| 580 | $tryIsPrefetch = true; |
| 581 | $text = $this->prefetch->prefetch( |
| 582 | (int)$this->thisPage, |
| 583 | (int)$this->thisRev, |
| 584 | trim( $this->thisRole ) |
| 585 | ) ?? false; |
| 586 | |
| 587 | if ( is_string( $text ) && $model !== null ) { |
| 588 | // Apply export transformation to text coming from an old dump. |
| 589 | // The purpose of this transformation is to convert up from legacy |
| 590 | // formats, which may still be used in the older dump that is used |
| 591 | // for pre-fetching. Applying the transformation again should not |
| 592 | // interfere with content that is already in the correct form. |
| 593 | $text = $this->exportTransform( $text, $model, $format ); |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | if ( $text === false ) { |
| 598 | // Fallback to asking the database |
| 599 | $tryIsPrefetch = false; |
| 600 | if ( $this->spawn ) { |
| 601 | $text = $this->getTextSpawned( $contentAddress ); |
| 602 | } else { |
| 603 | $text = $this->getTextDb( $contentAddress ); |
| 604 | } |
| 605 | |
| 606 | if ( $text !== false && $model !== null ) { |
| 607 | // Apply export transformation to text coming from the database. |
| 608 | // Prefetched text should already have transformations applied. |
| 609 | $text = $this->exportTransform( $text, $model, $format ); |
| 610 | } |
| 611 | |
| 612 | // No more checks for texts from DB for now. |
| 613 | // If we received something that is not false, |
| 614 | // We treat it as good text, regardless of whether it actually is or is not |
| 615 | if ( $text !== false ) { |
| 616 | return $text; |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | if ( $text === false ) { |
| 621 | throw new RuntimeException( "Generic error while obtaining text for id " . $contentAddress ); |
| 622 | } |
| 623 | |
| 624 | // We received a good candidate for the text of $id via some method |
| 625 | |
| 626 | // Step 2: Checking for plausibility and return the text if it is |
| 627 | // plausible |
| 628 | |
| 629 | if ( $expSize === null || strlen( $text ) == $expSize ) { |
| 630 | // @phan-suppress-next-line PhanPossiblyUndeclaredVariable Set when text is not false |
| 631 | if ( $tryIsPrefetch ) { |
| 632 | $this->prefetchCount++; |
| 633 | } |
| 634 | |
| 635 | return $text; |
| 636 | } |
| 637 | |
| 638 | $text = false; |
| 639 | throw new RuntimeException( "Received text is unplausible for id " . $contentAddress ); |
| 640 | } catch ( Exception $e ) { |
| 641 | $msg = "getting/checking text " . $contentAddress . " failed (" . $e->getMessage() |
| 642 | . ") for revision " . $this->thisRev; |
| 643 | if ( $failures + 1 < $this->maxFailures ) { |
| 644 | $msg .= " (Will retry " . ( $this->maxFailures - $failures - 1 ) . " more times)"; |
| 645 | } |
| 646 | $this->progress( $msg ); |
| 647 | } |
| 648 | |
| 649 | // Something went wrong; we did not get a text that was plausible :( |
| 650 | $failures++; |
| 651 | |
| 652 | if ( $contentAddress === $id && $this->thisRev && trim( $this->thisRole ) ) { |
| 653 | try { |
| 654 | // MediaWiki doesn't guarantee that content addresses are valid |
| 655 | // for any significant length of time. Try refreshing as the |
| 656 | // previously retrieved address may no longer be valid. |
| 657 | $revRecord = $this->getRevisionStore()->getRevisionById( (int)$this->thisRev ); |
| 658 | if ( $revRecord !== null ) { |
| 659 | $refreshed = $revRecord->getSlot( trim( $this->thisRole ) )->getAddress(); |
| 660 | if ( $contentAddress !== $refreshed ) { |
| 661 | $this->progress( |
| 662 | "Updated content address for rev {$this->thisRev} from " |
| 663 | . "{$contentAddress} to {$refreshed}" |
| 664 | ); |
| 665 | $contentAddress = $refreshed; |
| 666 | // Skip sleeping if we updated the address |
| 667 | continue; |
| 668 | } |
| 669 | } |
| 670 | } catch ( Exception $e ) { |
| 671 | $this->progress( |
| 672 | "refreshing content address for revision {$this->thisRev} failed ({$e->getMessage()})" |
| 673 | ); |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | // A failure in a prefetch hit does not warrant resetting db connection etc. |
| 678 | if ( !$tryIsPrefetch ) { |
| 679 | // After backing off for some time, we try to reboot the whole process as |
| 680 | // much as possible to not carry over failures from one part to the other |
| 681 | // parts |
| 682 | sleep( $this->failureTimeout ); |
| 683 | try { |
| 684 | if ( $this->spawn ) { |
| 685 | $this->closeSpawn(); |
| 686 | $this->openSpawn(); |
| 687 | } |
| 688 | } catch ( Exception $e ) { |
| 689 | $this->progress( "Rebooting getText infrastructure failed (" . $e->getMessage() . ")" . |
| 690 | " Trying to continue anyways" ); |
| 691 | } |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | // Retrieving a good text for $id failed (at least) maxFailures times. |
| 696 | // We abort for this $id. |
| 697 | |
| 698 | // Restoring the consecutive failures, and maybe aborting, if the dump |
| 699 | // is too broken. |
| 700 | $consecutiveFailedTextRetrievals = $oldConsecutiveFailedTextRetrievals + 1; |
| 701 | if ( $consecutiveFailedTextRetrievals > $this->maxConsecutiveFailedTextRetrievals ) { |
| 702 | throw new MWException( "Graceful storage failure" ); |
| 703 | } |
| 704 | |
| 705 | return ""; |
| 706 | } |
| 707 | |
| 708 | /** |
| 709 | * Loads the serialized content from storage. |
| 710 | * |
| 711 | * @param int|string $id Content address, or text row ID. |
| 712 | * @return string|false |
| 713 | */ |
| 714 | private function getTextDb( $id ) { |
| 715 | $store = $this->getBlobStore(); |
| 716 | $address = ( is_int( $id ) || strpos( $id, ':' ) === false ) |
| 717 | ? SqlBlobStore::makeAddressFromTextId( (int)$id ) |
| 718 | : $id; |
| 719 | |
| 720 | try { |
| 721 | $text = $store->getBlob( $address ); |
| 722 | |
| 723 | $stripped = str_replace( "\r", "", $text ); |
| 724 | $normalized = $this->getServiceContainer()->getContentLanguage() |
| 725 | ->normalize( $stripped ); |
| 726 | |
| 727 | return $normalized; |
| 728 | } catch ( BlobAccessException $ex ) { |
| 729 | // XXX: log a warning? |
| 730 | return false; |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | /** |
| 735 | * @param int|string $address Content address, or text row ID. |
| 736 | * @return string|false |
| 737 | */ |
| 738 | private function getTextSpawned( $address ) { |
| 739 | AtEase::suppressWarnings(); |
| 740 | if ( !$this->spawnProc ) { |
| 741 | // First time? |
| 742 | $this->openSpawn(); |
| 743 | } |
| 744 | $text = $this->getTextSpawnedOnce( $address ); |
| 745 | AtEase::restoreWarnings(); |
| 746 | |
| 747 | return $text; |
| 748 | } |
| 749 | |
| 750 | protected function openSpawn() { |
| 751 | global $IP; |
| 752 | |
| 753 | $wiki = WikiMap::getCurrentWikiId(); |
| 754 | if ( count( $this->php ) == 2 ) { |
| 755 | $mwscriptpath = $this->php[1]; |
| 756 | } else { |
| 757 | $mwscriptpath = "$IP/../multiversion/MWScript.php"; |
| 758 | } |
| 759 | if ( file_exists( $mwscriptpath ) ) { |
| 760 | $cmd = implode( " ", |
| 761 | array_map( [ Shell::class, 'escape' ], |
| 762 | [ |
| 763 | $this->php[0], |
| 764 | $mwscriptpath, |
| 765 | "fetchText.php", |
| 766 | '--wiki', $wiki ] ) ); |
| 767 | } else { |
| 768 | $cmd = implode( " ", |
| 769 | array_map( [ Shell::class, 'escape' ], |
| 770 | [ |
| 771 | $this->php[0], |
| 772 | "$IP/maintenance/fetchText.php", |
| 773 | '--wiki', $wiki ] ) ); |
| 774 | } |
| 775 | $spec = [ |
| 776 | 0 => [ "pipe", "r" ], |
| 777 | 1 => [ "pipe", "w" ], |
| 778 | 2 => [ "file", "/dev/null", "a" ] ]; |
| 779 | $pipes = []; |
| 780 | |
| 781 | $this->progress( "Spawning database subprocess: $cmd" ); |
| 782 | $this->spawnProc = proc_open( $cmd, $spec, $pipes ); |
| 783 | if ( !$this->spawnProc ) { |
| 784 | $this->progress( "Subprocess spawn failed." ); |
| 785 | |
| 786 | return false; |
| 787 | } |
| 788 | [ |
| 789 | $this->spawnWrite, // -> stdin |
| 790 | $this->spawnRead, // <- stdout |
| 791 | ] = $pipes; |
| 792 | |
| 793 | return true; |
| 794 | } |
| 795 | |
| 796 | private function closeSpawn() { |
| 797 | AtEase::suppressWarnings(); |
| 798 | if ( $this->spawnRead ) { |
| 799 | fclose( $this->spawnRead ); |
| 800 | } |
| 801 | $this->spawnRead = null; |
| 802 | if ( $this->spawnWrite ) { |
| 803 | fclose( $this->spawnWrite ); |
| 804 | } |
| 805 | $this->spawnWrite = null; |
| 806 | if ( $this->spawnErr ) { |
| 807 | fclose( $this->spawnErr ); |
| 808 | } |
| 809 | $this->spawnErr = false; |
| 810 | if ( $this->spawnProc ) { |
| 811 | proc_close( $this->spawnProc ); |
| 812 | } |
| 813 | $this->spawnProc = false; |
| 814 | AtEase::restoreWarnings(); |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * @param int|string $address Content address, or text row ID. |
| 819 | * @return string|false |
| 820 | */ |
| 821 | private function getTextSpawnedOnce( $address ) { |
| 822 | if ( is_int( $address ) || intval( $address ) ) { |
| 823 | $address = SqlBlobStore::makeAddressFromTextId( (int)$address ); |
| 824 | } |
| 825 | |
| 826 | $ok = fwrite( $this->spawnWrite, "$address\n" ); |
| 827 | // $this->progress( ">> $id" ); |
| 828 | if ( !$ok ) { |
| 829 | return false; |
| 830 | } |
| 831 | |
| 832 | $ok = fflush( $this->spawnWrite ); |
| 833 | // $this->progress( ">> [flush]" ); |
| 834 | if ( !$ok ) { |
| 835 | return false; |
| 836 | } |
| 837 | |
| 838 | // check that the text address they are sending is the one we asked for |
| 839 | // this avoids out of sync revision text errors we have encountered in the past |
| 840 | $newAddress = fgets( $this->spawnRead ); |
| 841 | if ( $newAddress === false ) { |
| 842 | return false; |
| 843 | } |
| 844 | $newAddress = trim( $newAddress ); |
| 845 | if ( strpos( $newAddress, ':' ) === false ) { |
| 846 | $newAddress = SqlBlobStore::makeAddressFromTextId( intval( $newAddress ) ); |
| 847 | } |
| 848 | |
| 849 | if ( $newAddress !== $address ) { |
| 850 | return false; |
| 851 | } |
| 852 | |
| 853 | $len = fgets( $this->spawnRead ); |
| 854 | // $this->progress( "<< " . trim( $len ) ); |
| 855 | if ( $len === false ) { |
| 856 | return false; |
| 857 | } |
| 858 | |
| 859 | $nbytes = intval( $len ); |
| 860 | // actual error, not zero-length text |
| 861 | if ( $nbytes < 0 ) { |
| 862 | return false; |
| 863 | } |
| 864 | |
| 865 | $text = ""; |
| 866 | |
| 867 | // Subprocess may not send everything at once, we have to loop. |
| 868 | while ( $nbytes > strlen( $text ) ) { |
| 869 | $buffer = fread( $this->spawnRead, $nbytes - strlen( $text ) ); |
| 870 | if ( $buffer === false ) { |
| 871 | break; |
| 872 | } |
| 873 | $text .= $buffer; |
| 874 | } |
| 875 | |
| 876 | $gotbytes = strlen( $text ); |
| 877 | if ( $gotbytes != $nbytes ) { |
| 878 | $this->progress( "Expected $nbytes bytes from database subprocess, got $gotbytes " ); |
| 879 | |
| 880 | return false; |
| 881 | } |
| 882 | |
| 883 | // Do normalization in the dump thread... |
| 884 | $stripped = str_replace( "\r", "", $text ); |
| 885 | $normalized = $this->getServiceContainer()->getContentLanguage()-> |
| 886 | normalize( $stripped ); |
| 887 | |
| 888 | return $normalized; |
| 889 | } |
| 890 | |
| 891 | protected function startElement( $parser, $name, $attribs ) { |
| 892 | $this->checkpointJustWritten = false; |
| 893 | |
| 894 | $this->clearOpenElement( null ); |
| 895 | $this->lastName = $name; |
| 896 | |
| 897 | if ( $name == 'revision' ) { |
| 898 | $this->state = $name; |
| 899 | $this->egress->writeOpenPage( null, $this->buffer ); |
| 900 | $this->buffer = ""; |
| 901 | } elseif ( $name == 'page' ) { |
| 902 | $this->state = $name; |
| 903 | if ( $this->atStart ) { |
| 904 | $this->egress->writeOpenStream( $this->buffer ); |
| 905 | $this->buffer = ""; |
| 906 | $this->atStart = false; |
| 907 | } |
| 908 | } elseif ( $name === 'mediawiki' ) { |
| 909 | if ( isset( $attribs['version'] ) ) { |
| 910 | if ( $attribs['version'] !== $this->schemaVersion ) { |
| 911 | throw new RuntimeException( 'Mismatching schema version. ' |
| 912 | . 'Use the --schema-version option to set the output schema version to ' |
| 913 | . 'the version declared by the stub file, namely ' . $attribs['version'] ); |
| 914 | } |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | if ( $name == "text" && ( isset( $attribs['id'] ) || isset( $attribs['location'] ) ) ) { |
| 919 | $id = $attribs['location'] ?? $attribs['id']; |
| 920 | $model = trim( $this->thisRevModel ); |
| 921 | $format = trim( $this->thisRevFormat ); |
| 922 | |
| 923 | $model = $model === '' ? null : $model; |
| 924 | $format = $format === '' ? null : $format; |
| 925 | $expSize = !empty( $attribs['bytes'] ) && $model === CONTENT_MODEL_WIKITEXT |
| 926 | ? (int)$attribs['bytes'] : null; |
| 927 | |
| 928 | $text = $this->getText( $id, $model, $format, $expSize ); |
| 929 | |
| 930 | unset( $attribs['id'] ); |
| 931 | unset( $attribs['location'] ); |
| 932 | if ( $text !== '' ) { |
| 933 | $attribs['xml:space'] = 'preserve'; |
| 934 | } |
| 935 | |
| 936 | $this->openElement = [ $name, $attribs ]; |
| 937 | if ( $text !== '' ) { |
| 938 | $this->characterData( $parser, $text ); |
| 939 | } |
| 940 | } else { |
| 941 | $this->openElement = [ $name, $attribs ]; |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | protected function endElement( $parser, $name ) { |
| 946 | $this->checkpointJustWritten = false; |
| 947 | |
| 948 | if ( $this->openElement ) { |
| 949 | $this->clearOpenElement( "" ); |
| 950 | } else { |
| 951 | $this->buffer .= "</$name>"; |
| 952 | } |
| 953 | |
| 954 | if ( $name == 'revision' ) { |
| 955 | $this->egress->writeRevision( null, $this->buffer ); |
| 956 | $this->buffer = ""; |
| 957 | $this->thisRev = ""; |
| 958 | $this->thisRole = null; |
| 959 | $this->thisRevModel = null; |
| 960 | $this->thisRevFormat = null; |
| 961 | } elseif ( $name == 'page' ) { |
| 962 | if ( !$this->firstPageWritten ) { |
| 963 | $this->firstPageWritten = trim( $this->thisPage ); |
| 964 | } |
| 965 | $this->lastPageWritten = trim( $this->thisPage ); |
| 966 | if ( $this->timeExceeded ) { |
| 967 | $this->egress->writeClosePage( $this->buffer ); |
| 968 | // nasty hack, we can't just write the chardata after the |
| 969 | // page tag, it will include leading blanks from the next line |
| 970 | $this->egress->sink->write( "\n" ); |
| 971 | |
| 972 | $this->buffer = $this->xmlwriterobj->closeStream(); |
| 973 | $this->egress->writeCloseStream( $this->buffer ); |
| 974 | |
| 975 | $this->buffer = ""; |
| 976 | $this->thisPage = ""; |
| 977 | // this could be more than one file if we had more than one output arg |
| 978 | |
| 979 | $filenameList = (array)$this->egress->getFilenames(); |
| 980 | $newFilenames = []; |
| 981 | $firstPageID = str_pad( $this->firstPageWritten, 9, "0", STR_PAD_LEFT ); |
| 982 | $lastPageID = str_pad( $this->lastPageWritten, 9, "0", STR_PAD_LEFT ); |
| 983 | $filenamesCount = count( $filenameList ); |
| 984 | for ( $i = 0; $i < $filenamesCount; $i++ ) { |
| 985 | $checkpointNameFilledIn = sprintf( $this->checkpointFiles[$i], $firstPageID, $lastPageID ); |
| 986 | $fileinfo = pathinfo( $filenameList[$i] ); |
| 987 | $newFilenames[] = $fileinfo['dirname'] . '/' . $checkpointNameFilledIn; |
| 988 | } |
| 989 | $this->egress->closeRenameAndReopen( $newFilenames ); |
| 990 | $this->buffer = $this->xmlwriterobj->openStream(); |
| 991 | $this->timeExceeded = false; |
| 992 | $this->timeOfCheckpoint = $this->lastTime; |
| 993 | $this->firstPageWritten = false; |
| 994 | $this->checkpointJustWritten = true; |
| 995 | } else { |
| 996 | $this->egress->writeClosePage( $this->buffer ); |
| 997 | $this->buffer = ""; |
| 998 | $this->thisPage = ""; |
| 999 | } |
| 1000 | } elseif ( $name == 'mediawiki' ) { |
| 1001 | $this->egress->writeCloseStream( $this->buffer ); |
| 1002 | $this->buffer = ""; |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | protected function characterData( $parser, $data ) { |
| 1007 | $this->clearOpenElement( null ); |
| 1008 | if ( $this->lastName == "id" ) { |
| 1009 | if ( $this->state == "revision" ) { |
| 1010 | $this->thisRev .= $data; |
| 1011 | $this->thisRole = SlotRecord::MAIN; |
| 1012 | } elseif ( $this->state == "page" ) { |
| 1013 | $this->thisPage .= $data; |
| 1014 | } |
| 1015 | } elseif ( $this->lastName == "model" ) { |
| 1016 | $this->thisRevModel .= $data; |
| 1017 | } elseif ( $this->lastName == "format" ) { |
| 1018 | $this->thisRevFormat .= $data; |
| 1019 | } elseif ( $this->lastName == "content" ) { |
| 1020 | $this->thisRole = ""; |
| 1021 | $this->thisRevModel = ""; |
| 1022 | $this->thisRevFormat = ""; |
| 1023 | } elseif ( $this->lastName == "role" ) { |
| 1024 | $this->thisRole .= $data; |
| 1025 | } |
| 1026 | |
| 1027 | // have to skip the newline left over from closepagetag line of |
| 1028 | // end of checkpoint files. nasty hack!! |
| 1029 | if ( $this->checkpointJustWritten ) { |
| 1030 | if ( $data[0] == "\n" ) { |
| 1031 | $data = substr( $data, 1 ); |
| 1032 | } |
| 1033 | $this->checkpointJustWritten = false; |
| 1034 | } |
| 1035 | $this->buffer .= htmlspecialchars( $data, ENT_COMPAT ); |
| 1036 | } |
| 1037 | |
| 1038 | protected function clearOpenElement( $style ) { |
| 1039 | if ( $this->openElement ) { |
| 1040 | $this->buffer .= Xml::element( $this->openElement[0], $this->openElement[1], $style ); |
| 1041 | $this->openElement = false; |
| 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | private function isValidTextId( string $id ): bool { |
| 1046 | if ( preg_match( '/:/', $id ) ) { |
| 1047 | return $id !== 'tt:0'; |
| 1048 | } elseif ( preg_match( '/^\d+$/', $id ) ) { |
| 1049 | return intval( $id ) > 0; |
| 1050 | } |
| 1051 | |
| 1052 | return false; |
| 1053 | } |
| 1054 | |
| 1055 | } |
| 1056 | |
| 1057 | /** @deprecated class alias since 1.43 */ |
| 1058 | class_alias( TextPassDumper::class, 'TextPassDumper' ); |