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Diffstat (limited to 'www/wiki/maintenance/storage/checkStorage.php')
-rw-r--r-- | www/wiki/maintenance/storage/checkStorage.php | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/www/wiki/maintenance/storage/checkStorage.php b/www/wiki/maintenance/storage/checkStorage.php new file mode 100644 index 00000000..f05be364 --- /dev/null +++ b/www/wiki/maintenance/storage/checkStorage.php @@ -0,0 +1,556 @@ +<?php +/** + * Fsck for MediaWiki + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * http://www.gnu.org/copyleft/gpl.html + * + * @file + * @ingroup Maintenance ExternalStorage + */ + +use MediaWiki\MediaWikiServices; + +if ( !defined( 'MEDIAWIKI' ) ) { + $optionsWithoutArgs = [ 'fix' ]; + require_once __DIR__ . '/../commandLine.inc'; + + $cs = new CheckStorage; + $fix = isset( $options['fix'] ); + if ( isset( $args[0] ) ) { + $xml = $args[0]; + } else { + $xml = false; + } + $cs->check( $fix, $xml ); +} + +// ---------------------------------------------------------------------------------- + +/** + * Maintenance script to do various checks on external storage. + * + * @fixme this should extend the base Maintenance class + * @ingroup Maintenance ExternalStorage + */ +class CheckStorage { + const CONCAT_HEADER = 'O:27:"concatenatedgziphistoryblob"'; + public $oldIdMap, $errors; + public $dbStore = null; + + public $errorDescriptions = [ + 'restore text' => 'Damaged text, need to be restored from a backup', + 'restore revision' => 'Damaged revision row, need to be restored from a backup', + 'unfixable' => 'Unexpected errors with no automated fixing method', + 'fixed' => 'Errors already fixed', + 'fixable' => 'Errors which would already be fixed if --fix was specified', + ]; + + function check( $fix = false, $xml = '' ) { + $dbr = wfGetDB( DB_REPLICA ); + if ( $fix ) { + print "Checking, will fix errors if possible...\n"; + } else { + print "Checking...\n"; + } + $maxRevId = $dbr->selectField( 'revision', 'MAX(rev_id)', '', __METHOD__ ); + $chunkSize = 1000; + $flagStats = []; + $objectStats = []; + $knownFlags = [ 'external', 'gzip', 'object', 'utf-8' ]; + $this->errors = [ + 'restore text' => [], + 'restore revision' => [], + 'unfixable' => [], + 'fixed' => [], + 'fixable' => [], + ]; + + for ( $chunkStart = 1; $chunkStart < $maxRevId; $chunkStart += $chunkSize ) { + $chunkEnd = $chunkStart + $chunkSize - 1; + // print "$chunkStart of $maxRevId\n"; + + // Fetch revision rows + $this->oldIdMap = []; + $dbr->ping(); + $res = $dbr->select( 'revision', [ 'rev_id', 'rev_text_id' ], + [ "rev_id BETWEEN $chunkStart AND $chunkEnd" ], __METHOD__ ); + foreach ( $res as $row ) { + $this->oldIdMap[$row->rev_id] = $row->rev_text_id; + } + $dbr->freeResult( $res ); + + if ( !count( $this->oldIdMap ) ) { + continue; + } + + // Fetch old_flags + $missingTextRows = array_flip( $this->oldIdMap ); + $externalRevs = []; + $objectRevs = []; + $res = $dbr->select( + 'text', + [ 'old_id', 'old_flags' ], + [ 'old_id' => $this->oldIdMap ], + __METHOD__ + ); + foreach ( $res as $row ) { + /** + * @var $flags int + */ + $flags = $row->old_flags; + $id = $row->old_id; + + // Create flagStats row if it doesn't exist + $flagStats = $flagStats + [ $flags => 0 ]; + // Increment counter + $flagStats[$flags]++; + + // Not missing + unset( $missingTextRows[$row->old_id] ); + + // Check for external or object + if ( $flags == '' ) { + $flagArray = []; + } else { + $flagArray = explode( ',', $flags ); + } + if ( in_array( 'external', $flagArray ) ) { + $externalRevs[] = $id; + } elseif ( in_array( 'object', $flagArray ) ) { + $objectRevs[] = $id; + } + + // Check for unrecognised flags + if ( $flags == '0' ) { + // This is a known bug from 2004 + // It's safe to just erase the old_flags field + if ( $fix ) { + $this->addError( 'fixed', "Warning: old_flags set to 0", $id ); + $dbw = wfGetDB( DB_MASTER ); + $dbw->ping(); + $dbw->update( 'text', [ 'old_flags' => '' ], + [ 'old_id' => $id ], __METHOD__ ); + echo "Fixed\n"; + } else { + $this->addError( 'fixable', "Warning: old_flags set to 0", $id ); + } + } elseif ( count( array_diff( $flagArray, $knownFlags ) ) ) { + $this->addError( 'unfixable', "Error: invalid flags field \"$flags\"", $id ); + } + } + $dbr->freeResult( $res ); + + // Output errors for any missing text rows + foreach ( $missingTextRows as $oldId => $revId ) { + $this->addError( 'restore revision', "Error: missing text row", $oldId ); + } + + // Verify external revisions + $externalConcatBlobs = []; + $externalNormalBlobs = []; + if ( count( $externalRevs ) ) { + $res = $dbr->select( + 'text', + [ 'old_id', 'old_flags', 'old_text' ], + [ 'old_id' => $externalRevs ], + __METHOD__ + ); + foreach ( $res as $row ) { + $urlParts = explode( '://', $row->old_text, 2 ); + if ( count( $urlParts ) !== 2 || $urlParts[1] == '' ) { + $this->addError( 'restore text', "Error: invalid URL \"{$row->old_text}\"", $row->old_id ); + continue; + } + list( $proto, ) = $urlParts; + if ( $proto != 'DB' ) { + $this->addError( + 'restore text', + "Error: invalid external protocol \"$proto\"", + $row->old_id ); + continue; + } + $path = explode( '/', $row->old_text ); + $cluster = $path[2]; + $id = $path[3]; + if ( isset( $path[4] ) ) { + $externalConcatBlobs[$cluster][$id][] = $row->old_id; + } else { + $externalNormalBlobs[$cluster][$id][] = $row->old_id; + } + } + $dbr->freeResult( $res ); + } + + // Check external concat blobs for the right header + $this->checkExternalConcatBlobs( $externalConcatBlobs ); + + // Check external normal blobs for existence + if ( count( $externalNormalBlobs ) ) { + if ( is_null( $this->dbStore ) ) { + $this->dbStore = new ExternalStoreDB; + } + foreach ( $externalConcatBlobs as $cluster => $xBlobIds ) { + $blobIds = array_keys( $xBlobIds ); + $extDb =& $this->dbStore->getSlave( $cluster ); + $blobsTable = $this->dbStore->getTable( $extDb ); + $res = $extDb->select( $blobsTable, + [ 'blob_id' ], + [ 'blob_id' => $blobIds ], + __METHOD__ + ); + foreach ( $res as $row ) { + unset( $xBlobIds[$row->blob_id] ); + } + $extDb->freeResult( $res ); + // Print errors for missing blobs rows + foreach ( $xBlobIds as $blobId => $oldId ) { + $this->addError( + 'restore text', + "Error: missing target $blobId for one-part ES URL", + $oldId ); + } + } + } + + // Check local objects + $dbr->ping(); + $concatBlobs = []; + $curIds = []; + if ( count( $objectRevs ) ) { + $headerLength = 300; + $res = $dbr->select( + 'text', + [ 'old_id', 'old_flags', "LEFT(old_text, $headerLength) AS header" ], + [ 'old_id' => $objectRevs ], + __METHOD__ + ); + foreach ( $res as $row ) { + $oldId = $row->old_id; + $matches = []; + if ( !preg_match( '/^O:(\d+):"(\w+)"/', $row->header, $matches ) ) { + $this->addError( 'restore text', "Error: invalid object header", $oldId ); + continue; + } + + $className = strtolower( $matches[2] ); + if ( strlen( $className ) != $matches[1] ) { + $this->addError( + 'restore text', + "Error: invalid object header, wrong class name length", + $oldId + ); + continue; + } + + $objectStats = $objectStats + [ $className => 0 ]; + $objectStats[$className]++; + + switch ( $className ) { + case 'concatenatedgziphistoryblob': + // Good + break; + case 'historyblobstub': + case 'historyblobcurstub': + if ( strlen( $row->header ) == $headerLength ) { + $this->addError( 'unfixable', "Error: overlong stub header", $oldId ); + break; + } + $stubObj = unserialize( $row->header ); + if ( !is_object( $stubObj ) ) { + $this->addError( 'restore text', "Error: unable to unserialize stub object", $oldId ); + break; + } + if ( $className == 'historyblobstub' ) { + $concatBlobs[$stubObj->mOldId][] = $oldId; + } else { + $curIds[$stubObj->mCurId][] = $oldId; + } + break; + default: + $this->addError( 'unfixable', "Error: unrecognised object class \"$className\"", $oldId ); + } + } + $dbr->freeResult( $res ); + } + + // Check local concat blob validity + $externalConcatBlobs = []; + if ( count( $concatBlobs ) ) { + $headerLength = 300; + $res = $dbr->select( + 'text', + [ 'old_id', 'old_flags', "LEFT(old_text, $headerLength) AS header" ], + [ 'old_id' => array_keys( $concatBlobs ) ], + __METHOD__ + ); + foreach ( $res as $row ) { + $flags = explode( ',', $row->old_flags ); + if ( in_array( 'external', $flags ) ) { + // Concat blob is in external storage? + if ( in_array( 'object', $flags ) ) { + $urlParts = explode( '/', $row->header ); + if ( $urlParts[0] != 'DB:' ) { + $this->addError( + 'unfixable', + "Error: unrecognised external storage type \"{$urlParts[0]}", + $row->old_id + ); + } else { + $cluster = $urlParts[2]; + $id = $urlParts[3]; + if ( !isset( $externalConcatBlobs[$cluster][$id] ) ) { + $externalConcatBlobs[$cluster][$id] = []; + } + $externalConcatBlobs[$cluster][$id] = array_merge( + $externalConcatBlobs[$cluster][$id], $concatBlobs[$row->old_id] + ); + } + } else { + $this->addError( + 'unfixable', + "Error: invalid flags \"{$row->old_flags}\" on concat bulk row {$row->old_id}", + $concatBlobs[$row->old_id] ); + } + } elseif ( strcasecmp( + substr( $row->header, 0, strlen( self::CONCAT_HEADER ) ), + self::CONCAT_HEADER + ) ) { + $this->addError( + 'restore text', + "Error: Incorrect object header for concat bulk row {$row->old_id}", + $concatBlobs[$row->old_id] + ); + } # else good + + unset( $concatBlobs[$row->old_id] ); + } + $dbr->freeResult( $res ); + } + + // Check targets of unresolved stubs + $this->checkExternalConcatBlobs( $externalConcatBlobs ); + // next chunk + } + + print "\n\nErrors:\n"; + foreach ( $this->errors as $name => $errors ) { + if ( count( $errors ) ) { + $description = $this->errorDescriptions[$name]; + echo "$description: " . implode( ',', array_keys( $errors ) ) . "\n"; + } + } + + if ( count( $this->errors['restore text'] ) && $fix ) { + if ( (string)$xml !== '' ) { + $this->restoreText( array_keys( $this->errors['restore text'] ), $xml ); + } else { + echo "Can't fix text, no XML backup specified\n"; + } + } + + print "\nFlag statistics:\n"; + $total = array_sum( $flagStats ); + foreach ( $flagStats as $flag => $count ) { + printf( "%-30s %10d %5.2f%%\n", $flag, $count, $count / $total * 100 ); + } + print "\nLocal object statistics:\n"; + $total = array_sum( $objectStats ); + foreach ( $objectStats as $className => $count ) { + printf( "%-30s %10d %5.2f%%\n", $className, $count, $count / $total * 100 ); + } + } + + function addError( $type, $msg, $ids ) { + if ( is_array( $ids ) && count( $ids ) == 1 ) { + $ids = reset( $ids ); + } + if ( is_array( $ids ) ) { + $revIds = []; + foreach ( $ids as $id ) { + $revIds = array_merge( $revIds, array_keys( $this->oldIdMap, $id ) ); + } + print "$msg in text rows " . implode( ', ', $ids ) . + ", revisions " . implode( ', ', $revIds ) . "\n"; + } else { + $id = $ids; + $revIds = array_keys( $this->oldIdMap, $id ); + if ( count( $revIds ) == 1 ) { + print "$msg in old_id $id, rev_id {$revIds[0]}\n"; + } else { + print "$msg in old_id $id, revisions " . implode( ', ', $revIds ) . "\n"; + } + } + $this->errors[$type] = $this->errors[$type] + array_flip( $revIds ); + } + + function checkExternalConcatBlobs( $externalConcatBlobs ) { + if ( !count( $externalConcatBlobs ) ) { + return; + } + + if ( is_null( $this->dbStore ) ) { + $this->dbStore = new ExternalStoreDB; + } + + foreach ( $externalConcatBlobs as $cluster => $oldIds ) { + $blobIds = array_keys( $oldIds ); + $extDb =& $this->dbStore->getSlave( $cluster ); + $blobsTable = $this->dbStore->getTable( $extDb ); + $headerLength = strlen( self::CONCAT_HEADER ); + $res = $extDb->select( $blobsTable, + [ 'blob_id', "LEFT(blob_text, $headerLength) AS header" ], + [ 'blob_id' => $blobIds ], + __METHOD__ + ); + foreach ( $res as $row ) { + if ( strcasecmp( $row->header, self::CONCAT_HEADER ) ) { + $this->addError( + 'restore text', + "Error: invalid header on target $cluster/{$row->blob_id} of two-part ES URL", + $oldIds[$row->blob_id] + ); + } + unset( $oldIds[$row->blob_id] ); + } + $extDb->freeResult( $res ); + + // Print errors for missing blobs rows + foreach ( $oldIds as $blobId => $oldIds2 ) { + $this->addError( + 'restore text', + "Error: missing target $cluster/$blobId for two-part ES URL", + $oldIds2 + ); + } + } + } + + function restoreText( $revIds, $xml ) { + global $wgDBname; + $tmpDir = wfTempDir(); + + if ( !count( $revIds ) ) { + return; + } + + print "Restoring text from XML backup...\n"; + + $revFileName = "$tmpDir/broken-revlist-$wgDBname"; + $filteredXmlFileName = "$tmpDir/filtered-$wgDBname.xml"; + + // Write revision list + if ( !file_put_contents( $revFileName, implode( "\n", $revIds ) ) ) { + echo "Error writing revision list, can't restore text\n"; + + return; + } + + // Run mwdumper + echo "Filtering XML dump...\n"; + $exitStatus = 0; + passthru( 'mwdumper ' . + wfEscapeShellArg( + "--output=file:$filteredXmlFileName", + "--filter=revlist:$revFileName", + $xml + ), $exitStatus + ); + + if ( $exitStatus ) { + echo "mwdumper died with exit status $exitStatus\n"; + + return; + } + + $file = fopen( $filteredXmlFileName, 'r' ); + if ( !$file ) { + echo "Unable to open filtered XML file\n"; + + return; + } + + $dbr = wfGetDB( DB_REPLICA ); + $dbw = wfGetDB( DB_MASTER ); + $dbr->ping(); + $dbw->ping(); + + $source = new ImportStreamSource( $file ); + $importer = new WikiImporter( + $source, + MediaWikiServices::getInstance()->getMainConfig() + ); + $importer->setRevisionCallback( [ $this, 'importRevision' ] ); + $importer->setNoticeCallback( function ( $msg, $params ) { + echo wfMessage( $msg, $params )->text() . "\n"; + } ); + $importer->doImport(); + } + + function importRevision( &$revision, &$importer ) { + $id = $revision->getID(); + $content = $revision->getContent( Revision::RAW ); + $id = $id ? $id : ''; + + if ( $content === null ) { + echo "Revision $id is broken, we have no content available\n"; + + return; + } + + $text = $content->serialize(); + if ( $text === '' ) { + // This is what happens if the revision was broken at the time the + // dump was made. Unfortunately, it also happens if the revision was + // legitimately blank, so there's no way to tell the difference. To + // be safe, we'll skip it and leave it broken + + echo "Revision $id is blank in the dump, may have been broken before export\n"; + + return; + } + + if ( !$id ) { + // No ID, can't import + echo "No id tag in revision, can't import\n"; + + return; + } + + // Find text row again + $dbr = wfGetDB( DB_REPLICA ); + $oldId = $dbr->selectField( 'revision', 'rev_text_id', [ 'rev_id' => $id ], __METHOD__ ); + if ( !$oldId ) { + echo "Missing revision row for rev_id $id\n"; + + return; + } + + // Compress the text + $flags = Revision::compressRevisionText( $text ); + + // Update the text row + $dbw = wfGetDB( DB_MASTER ); + $dbw->update( 'text', + [ 'old_flags' => $flags, 'old_text' => $text ], + [ 'old_id' => $oldId ], + __METHOD__, [ 'LIMIT' => 1 ] + ); + + // Remove it from the unfixed list and add it to the fixed list + unset( $this->errors['restore text'][$id] ); + $this->errors['fixed'][$id] = true; + } +} |