MediaWiki REL1_34
checkStorage.php
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1<?php
27
28if ( !defined( 'MEDIAWIKI' ) ) {
29 $optionsWithoutArgs = [ 'fix' ];
30 require_once __DIR__ . '/../commandLine.inc';
31
32 $cs = new CheckStorage;
33 $fix = isset( $options['fix'] );
34 $xml = $args[0] ?? false;
35 $cs->check( $fix, $xml );
36}
37
38// ----------------------------------------------------------------------------------
39
47 const CONCAT_HEADER = 'O:27:"concatenatedgziphistoryblob"';
50 public $dbStore = null;
51
53 'restore text' => 'Damaged text, need to be restored from a backup',
54 'restore revision' => 'Damaged revision row, need to be restored from a backup',
55 'unfixable' => 'Unexpected errors with no automated fixing method',
56 'fixed' => 'Errors already fixed',
57 'fixable' => 'Errors which would already be fixed if --fix was specified',
58 ];
59
60 function check( $fix = false, $xml = '' ) {
62
64 if ( $fix ) {
65 print "Checking, will fix errors if possible...\n";
66 } else {
67 print "Checking...\n";
68 }
69 $maxRevId = $dbr->selectField( 'revision', 'MAX(rev_id)', '', __METHOD__ );
70 $chunkSize = 1000;
71 $flagStats = [];
72 $objectStats = [];
73 $knownFlags = [ 'external', 'gzip', 'object', 'utf-8' ];
74 $this->errors = [
75 'restore text' => [],
76 'restore revision' => [],
77 'unfixable' => [],
78 'fixed' => [],
79 'fixable' => [],
80 ];
81
82 for ( $chunkStart = 1; $chunkStart < $maxRevId; $chunkStart += $chunkSize ) {
83 $chunkEnd = $chunkStart + $chunkSize - 1;
84 // print "$chunkStart of $maxRevId\n";
85
86 $this->oldIdMap = [];
87 $dbr->ping();
88
89 // Fetch revision rows
91 $res = $dbr->select( 'revision', [ 'rev_id', 'rev_text_id' ],
92 [ "rev_id BETWEEN $chunkStart AND $chunkEnd" ], __METHOD__ );
93 foreach ( $res as $row ) {
94 if ( !isset( $this->oldIdMap[ $row->rev_text_id ] ) ) {
95 $this->oldIdMap[ $row->rev_text_id ] = [ $row->rev_id ];
96 } elseif ( !in_array( $row->rev_id, $this->oldIdMap[ $row->rev_text_id ] ) ) {
97 $this->oldIdMap[ $row->rev_text_id ][] = $row->rev_id;
98 }
99 }
100 } else {
101 $res = $dbr->select(
102 [ 'slots', 'content' ],
103 [ 'slot_revision_id', 'content_address' ],
104 [ "slot_revision_id BETWEEN $chunkStart AND $chunkEnd" ],
105 __METHOD__,
106 [],
107 [ 'content' => [ 'INNER JOIN', [ 'content_id = slot_content_id' ] ] ]
108 );
110 $blobStore = MediaWikiServices::getInstance()->getBlobStore();
111 '@phan-var \MediaWiki\Storage\SqlBlobStore $blobStore';
112 foreach ( $res as $row ) {
113 $textId = $blobStore->getTextIdFromAddress( $row->content_address );
114 if ( $textId ) {
115 if ( !isset( $this->oldIdMap[$textId] ) ) {
116 $this->oldIdMap[ $textId ] = [ $row->slot_revision_id ];
117 } elseif ( !in_array( $row->slot_revision_id, $this->oldIdMap[$textId] ) ) {
118 $this->oldIdMap[ $textId ][] = $row->slot_revision_id;
119 }
120 }
121 }
122 }
123
124 if ( !count( $this->oldIdMap ) ) {
125 continue;
126 }
127
128 // Fetch old_flags
129 $missingTextRows = $this->oldIdMap;
130 $externalRevs = [];
131 $objectRevs = [];
132 $res = $dbr->select(
133 'text',
134 [ 'old_id', 'old_flags' ],
135 [ 'old_id' => array_keys( $this->oldIdMap ) ],
136 __METHOD__
137 );
138 foreach ( $res as $row ) {
142 $flags = $row->old_flags;
143 $id = $row->old_id;
144
145 // Create flagStats row if it doesn't exist
146 $flagStats = $flagStats + [ $flags => 0 ];
147 // Increment counter
148 $flagStats[$flags]++;
149
150 // Not missing
151 unset( $missingTextRows[$row->old_id] );
152
153 // Check for external or object
154 if ( $flags == '' ) {
155 $flagArray = [];
156 } else {
157 $flagArray = explode( ',', $flags );
158 }
159 if ( in_array( 'external', $flagArray ) ) {
160 $externalRevs[] = $id;
161 } elseif ( in_array( 'object', $flagArray ) ) {
162 $objectRevs[] = $id;
163 }
164
165 // Check for unrecognised flags
166 if ( $flags == '0' ) {
167 // This is a known bug from 2004
168 // It's safe to just erase the old_flags field
169 if ( $fix ) {
170 $this->addError( 'fixed', "Warning: old_flags set to 0", $id );
171 $dbw = wfGetDB( DB_MASTER );
172 $dbw->ping();
173 $dbw->update( 'text', [ 'old_flags' => '' ],
174 [ 'old_id' => $id ], __METHOD__ );
175 echo "Fixed\n";
176 } else {
177 $this->addError( 'fixable', "Warning: old_flags set to 0", $id );
178 }
179 } elseif ( count( array_diff( $flagArray, $knownFlags ) ) ) {
180 $this->addError( 'unfixable', "Error: invalid flags field \"$flags\"", $id );
181 }
182 }
183
184 // Output errors for any missing text rows
185 foreach ( $missingTextRows as $oldId => $revIds ) {
186 $this->addError( 'restore revision', "Error: missing text row", $oldId );
187 }
188
189 // Verify external revisions
190 $externalConcatBlobs = [];
191 $externalNormalBlobs = [];
192 if ( count( $externalRevs ) ) {
193 $res = $dbr->select(
194 'text',
195 [ 'old_id', 'old_flags', 'old_text' ],
196 [ 'old_id' => $externalRevs ],
197 __METHOD__
198 );
199 foreach ( $res as $row ) {
200 $urlParts = explode( '://', $row->old_text, 2 );
201 if ( count( $urlParts ) !== 2 || $urlParts[1] == '' ) {
202 $this->addError( 'restore text', "Error: invalid URL \"{$row->old_text}\"", $row->old_id );
203 continue;
204 }
205 list( $proto, ) = $urlParts;
206 if ( $proto != 'DB' ) {
207 $this->addError(
208 'restore text',
209 "Error: invalid external protocol \"$proto\"",
210 $row->old_id );
211 continue;
212 }
213 $path = explode( '/', $row->old_text );
214 $cluster = $path[2];
215 $id = $path[3];
216 if ( isset( $path[4] ) ) {
217 $externalConcatBlobs[$cluster][$id][] = $row->old_id;
218 } else {
219 $externalNormalBlobs[$cluster][$id][] = $row->old_id;
220 }
221 }
222 }
223
224 // Check external concat blobs for the right header
225 $this->checkExternalConcatBlobs( $externalConcatBlobs );
226
227 // Check external normal blobs for existence
228 if ( count( $externalNormalBlobs ) ) {
229 if ( is_null( $this->dbStore ) ) {
230 $esFactory = MediaWikiServices::getInstance()->getExternalStoreFactory();
231 $this->dbStore = $esFactory->getStore( 'DB' );
232 }
233 foreach ( $externalConcatBlobs as $cluster => $xBlobIds ) {
234 $blobIds = array_keys( $xBlobIds );
235 $extDb =& $this->dbStore->getReplica( $cluster );
236 $blobsTable = $this->dbStore->getTable( $extDb );
237 $res = $extDb->select( $blobsTable,
238 [ 'blob_id' ],
239 [ 'blob_id' => $blobIds ],
240 __METHOD__
241 );
242 foreach ( $res as $row ) {
243 unset( $xBlobIds[$row->blob_id] );
244 }
245 // Print errors for missing blobs rows
246 foreach ( $xBlobIds as $blobId => $oldId ) {
247 $this->addError(
248 'restore text',
249 "Error: missing target $blobId for one-part ES URL",
250 $oldId );
251 }
252 }
253 }
254
255 // Check local objects
256 $dbr->ping();
257 $concatBlobs = [];
258 $curIds = [];
259 if ( count( $objectRevs ) ) {
260 $headerLength = 300;
261 $res = $dbr->select(
262 'text',
263 [ 'old_id', 'old_flags', "LEFT(old_text, $headerLength) AS header" ],
264 [ 'old_id' => $objectRevs ],
265 __METHOD__
266 );
267 foreach ( $res as $row ) {
268 $oldId = $row->old_id;
269 $matches = [];
270 if ( !preg_match( '/^O:(\d+):"(\w+)"/', $row->header, $matches ) ) {
271 $this->addError( 'restore text', "Error: invalid object header", $oldId );
272 continue;
273 }
274
275 $className = strtolower( $matches[2] );
276 if ( strlen( $className ) != $matches[1] ) {
277 $this->addError(
278 'restore text',
279 "Error: invalid object header, wrong class name length",
280 $oldId
281 );
282 continue;
283 }
284
285 $objectStats = $objectStats + [ $className => 0 ];
286 $objectStats[$className]++;
287
288 switch ( $className ) {
289 case 'concatenatedgziphistoryblob':
290 // Good
291 break;
292 case 'historyblobstub':
293 case 'historyblobcurstub':
294 if ( strlen( $row->header ) == $headerLength ) {
295 $this->addError( 'unfixable', "Error: overlong stub header", $oldId );
296 break;
297 }
298 $stubObj = unserialize( $row->header );
299 if ( !is_object( $stubObj ) ) {
300 $this->addError( 'restore text', "Error: unable to unserialize stub object", $oldId );
301 break;
302 }
303 if ( $className == 'historyblobstub' ) {
304 $concatBlobs[$stubObj->mOldId][] = $oldId;
305 } else {
306 $curIds[$stubObj->mCurId][] = $oldId;
307 }
308 break;
309 default:
310 $this->addError( 'unfixable', "Error: unrecognised object class \"$className\"", $oldId );
311 }
312 }
313 }
314
315 // Check local concat blob validity
316 $externalConcatBlobs = [];
317 if ( count( $concatBlobs ) ) {
318 $headerLength = 300;
319 $res = $dbr->select(
320 'text',
321 [ 'old_id', 'old_flags', "LEFT(old_text, $headerLength) AS header" ],
322 [ 'old_id' => array_keys( $concatBlobs ) ],
323 __METHOD__
324 );
325 foreach ( $res as $row ) {
326 $flags = explode( ',', $row->old_flags );
327 if ( in_array( 'external', $flags ) ) {
328 // Concat blob is in external storage?
329 if ( in_array( 'object', $flags ) ) {
330 $urlParts = explode( '/', $row->header );
331 if ( $urlParts[0] != 'DB:' ) {
332 $this->addError(
333 'unfixable',
334 "Error: unrecognised external storage type \"{$urlParts[0]}",
335 $row->old_id
336 );
337 } else {
338 $cluster = $urlParts[2];
339 $id = $urlParts[3];
340 if ( !isset( $externalConcatBlobs[$cluster][$id] ) ) {
341 $externalConcatBlobs[$cluster][$id] = [];
342 }
343 $externalConcatBlobs[$cluster][$id] = array_merge(
344 $externalConcatBlobs[$cluster][$id], $concatBlobs[$row->old_id]
345 );
346 }
347 } else {
348 $this->addError(
349 'unfixable',
350 "Error: invalid flags \"{$row->old_flags}\" on concat bulk row {$row->old_id}",
351 $concatBlobs[$row->old_id] );
352 }
353 } elseif ( strcasecmp(
354 substr( $row->header, 0, strlen( self::CONCAT_HEADER ) ),
355 self::CONCAT_HEADER
356 ) ) {
357 $this->addError(
358 'restore text',
359 "Error: Incorrect object header for concat bulk row {$row->old_id}",
360 $concatBlobs[$row->old_id]
361 );
362 } # else good
363
364 unset( $concatBlobs[$row->old_id] );
365 }
366 }
367
368 // Check targets of unresolved stubs
369 $this->checkExternalConcatBlobs( $externalConcatBlobs );
370 // next chunk
371 }
372
373 print "\n\nErrors:\n";
374 foreach ( $this->errors as $name => $errors ) {
375 if ( count( $errors ) ) {
376 $description = $this->errorDescriptions[$name];
377 echo "$description: " . implode( ',', array_keys( $errors ) ) . "\n";
378 }
379 }
380
381 if ( count( $this->errors['restore text'] ) && $fix ) {
382 if ( (string)$xml !== '' ) {
383 $this->restoreText( array_keys( $this->errors['restore text'] ), $xml );
384 } else {
385 echo "Can't fix text, no XML backup specified\n";
386 }
387 }
388
389 print "\nFlag statistics:\n";
390 $total = array_sum( $flagStats );
391 foreach ( $flagStats as $flag => $count ) {
392 printf( "%-30s %10d %5.2f%%\n", $flag, $count, $count / $total * 100 );
393 }
394 print "\nLocal object statistics:\n";
395 $total = array_sum( $objectStats );
396 foreach ( $objectStats as $className => $count ) {
397 printf( "%-30s %10d %5.2f%%\n", $className, $count, $count / $total * 100 );
398 }
399 }
400
401 function addError( $type, $msg, $ids ) {
402 if ( is_array( $ids ) && count( $ids ) == 1 ) {
403 $ids = reset( $ids );
404 }
405 if ( is_array( $ids ) ) {
406 $revIds = [];
407 foreach ( $ids as $id ) {
408 $revIds = array_unique( array_merge( $revIds, $this->oldIdMap[$id] ) );
409 }
410 print "$msg in text rows " . implode( ', ', $ids ) .
411 ", revisions " . implode( ', ', $revIds ) . "\n";
412 } else {
413 $id = $ids;
414 $revIds = $this->oldIdMap[$id];
415 if ( count( $revIds ) == 1 ) {
416 print "$msg in old_id $id, rev_id {$revIds[0]}\n";
417 } else {
418 print "$msg in old_id $id, revisions " . implode( ', ', $revIds ) . "\n";
419 }
420 }
421 $this->errors[$type] = $this->errors[$type] + array_flip( $revIds );
422 }
423
424 function checkExternalConcatBlobs( $externalConcatBlobs ) {
425 if ( !count( $externalConcatBlobs ) ) {
426 return;
427 }
428
429 if ( is_null( $this->dbStore ) ) {
430 $esFactory = MediaWikiServices::getInstance()->getExternalStoreFactory();
431 $this->dbStore = $esFactory->getStore( 'DB' );
432 }
433
434 foreach ( $externalConcatBlobs as $cluster => $oldIds ) {
435 $blobIds = array_keys( $oldIds );
436 $extDb =& $this->dbStore->getReplica( $cluster );
437 $blobsTable = $this->dbStore->getTable( $extDb );
438 $headerLength = strlen( self::CONCAT_HEADER );
439 $res = $extDb->select( $blobsTable,
440 [ 'blob_id', "LEFT(blob_text, $headerLength) AS header" ],
441 [ 'blob_id' => $blobIds ],
442 __METHOD__
443 );
444 foreach ( $res as $row ) {
445 if ( strcasecmp( $row->header, self::CONCAT_HEADER ) ) {
446 $this->addError(
447 'restore text',
448 "Error: invalid header on target $cluster/{$row->blob_id} of two-part ES URL",
449 $oldIds[$row->blob_id]
450 );
451 }
452 unset( $oldIds[$row->blob_id] );
453 }
454
455 // Print errors for missing blobs rows
456 foreach ( $oldIds as $blobId => $oldIds2 ) {
457 $this->addError(
458 'restore text',
459 "Error: missing target $cluster/$blobId for two-part ES URL",
460 $oldIds2
461 );
462 }
463 }
464 }
465
466 function restoreText( $revIds, $xml ) {
467 global $wgDBname;
468 $tmpDir = wfTempDir();
469
470 if ( !count( $revIds ) ) {
471 return;
472 }
473
474 print "Restoring text from XML backup...\n";
475
476 $revFileName = "$tmpDir/broken-revlist-$wgDBname";
477 $filteredXmlFileName = "$tmpDir/filtered-$wgDBname.xml";
478
479 // Write revision list
480 if ( !file_put_contents( $revFileName, implode( "\n", $revIds ) ) ) {
481 echo "Error writing revision list, can't restore text\n";
482
483 return;
484 }
485
486 // Run mwdumper
487 echo "Filtering XML dump...\n";
488 $exitStatus = 0;
489 passthru( 'mwdumper ' .
490 Shell::escape(
491 "--output=file:$filteredXmlFileName",
492 "--filter=revlist:$revFileName",
493 $xml
494 ), $exitStatus
495 );
496
497 if ( $exitStatus ) {
498 echo "mwdumper died with exit status $exitStatus\n";
499
500 return;
501 }
502
503 $file = fopen( $filteredXmlFileName, 'r' );
504 if ( !$file ) {
505 echo "Unable to open filtered XML file\n";
506
507 return;
508 }
509
511 $dbw = wfGetDB( DB_MASTER );
512 $dbr->ping();
513 $dbw->ping();
514
516 $importer = new WikiImporter(
517 $source,
518 MediaWikiServices::getInstance()->getMainConfig()
519 );
520 $importer->setRevisionCallback( [ $this, 'importRevision' ] );
521 $importer->setNoticeCallback( function ( $msg, $params ) {
522 echo wfMessage( $msg, $params )->text() . "\n";
523 } );
524 $importer->doImport();
525 }
526
527 function importRevision( &$revision, &$importer ) {
528 $id = $revision->getID();
529 $content = $revision->getContent( RevisionRecord::RAW );
530 $id = $id ?: '';
531
532 if ( $content === null ) {
533 echo "Revision $id is broken, we have no content available\n";
534
535 return;
536 }
537
538 $text = $content->serialize();
539 if ( $text === '' ) {
540 // This is what happens if the revision was broken at the time the
541 // dump was made. Unfortunately, it also happens if the revision was
542 // legitimately blank, so there's no way to tell the difference. To
543 // be safe, we'll skip it and leave it broken
544
545 echo "Revision $id is blank in the dump, may have been broken before export\n";
546
547 return;
548 }
549
550 if ( !$id ) {
551 // No ID, can't import
552 echo "No id tag in revision, can't import\n";
553
554 return;
555 }
556
557 // Find text row again
561 $oldId = $dbr->selectField( 'revision', 'rev_text_id', [ 'rev_id' => $id ], __METHOD__ );
562 } else {
563 $res = $dbr->selectRow(
564 [ 'slots', 'content' ],
565 [ 'content_address' ],
566 [ 'slot_revision_id' => $id ],
567 __METHOD__,
568 [],
569 [ 'content' => [ 'INNER JOIN', [ 'content_id = slot_content_id' ] ] ]
570 );
571 // @phan-suppress-next-line PhanAccessMethodInternal
572 $blobStore = MediaWikiServices::getInstance()
573 ->getBlobStoreFactory()
574 ->newSqlBlobStore();
575 $oldId = $blobStore->getTextIdFromAddress( $res->content_address );
576 }
577
578 if ( !$oldId ) {
579 echo "Missing revision row for rev_id $id\n";
580 return;
581 }
582
583 // Compress the text
584 $flags = Revision::compressRevisionText( $text );
585
586 // Update the text row
587 $dbw = wfGetDB( DB_MASTER );
588 $dbw->update( 'text',
589 [ 'old_flags' => $flags, 'old_text' => $text ],
590 [ 'old_id' => $oldId ],
591 __METHOD__, [ 'LIMIT' => 1 ]
592 );
593
594 // Remove it from the unfixed list and add it to the fixed list
595 unset( $this->errors['restore text'][$id] );
596 $this->errors['fixed'][$id] = true;
597 }
598}
unserialize( $serialized)
int $wgMultiContentRevisionSchemaMigrationStage
RevisionStore table schema migration stage (content, slots, content_models & slot_roles tables).
$wgDBname
Current wiki database name.
wfTempDir()
Tries to get the system directory for temporary files.
wfGetDB( $db, $groups=[], $wiki=false)
Get a Database object.
wfMessage( $key,... $params)
This is the function for getting translated interface messages.
if( $line===false) $args
Definition cdb.php:64
Maintenance script to do various checks on external storage.
check( $fix=false, $xml='')
restoreText( $revIds, $xml)
importRevision(&$revision, &$importer)
addError( $type, $msg, $ids)
const CONCAT_HEADER
checkExternalConcatBlobs( $externalConcatBlobs)
ExternalStoreDB $dbStore
DB accessible external objects.
Imports a XML dump from a file (either from file upload, files on disk, or HTTP)
MediaWikiServices is the service locator for the application scope of MediaWiki.
Page revision base class.
Executes shell commands.
Definition Shell.php:44
static compressRevisionText(&$text)
If $wgCompressRevisions is enabled, we will compress data.
Definition Revision.php:926
XML file reader for the page data importer.
global $optionsWithoutArgs
while(( $__line=Maintenance::readconsole()) !==false) print
Definition eval.php:64
const SCHEMA_COMPAT_READ_OLD
Definition Defines.php:274
$source
const DB_REPLICA
Definition defines.php:25
const DB_MASTER
Definition defines.php:26
$content
Definition router.php:78
if(PHP_SAPI !='cli-server') if(!isset( $_SERVER['SCRIPT_FILENAME'])) $file
Item class for a filearchive table row.
Definition router.php:42