diff options
Diffstat (limited to 'maintenance/storage/checkStorage.php')
| -rw-r--r-- | maintenance/storage/checkStorage.php | 468 |
1 files changed, 468 insertions, 0 deletions
diff --git a/maintenance/storage/checkStorage.php b/maintenance/storage/checkStorage.php new file mode 100644 index 00000000..a83d2744 --- /dev/null +++ b/maintenance/storage/checkStorage.php @@ -0,0 +1,468 @@ +<?php
+
+/**
+ * Fsck for MediaWiki
+ */
+
+define( 'CONCAT_HEADER', 'O:27:"concatenatedgziphistoryblob"' );
+
+if ( !defined( 'MEDIAWIKI' ) ) {
+ require_once( dirname(__FILE__) . '/../commandLine.inc' );
+ require_once( 'ExternalStore.php' );
+ require_once( 'ExternalStoreDB.php' );
+ require_once( 'SpecialImport.php' );
+
+ $cs = new CheckStorage;
+ $fix = isset( $options['fix'] );
+ if ( isset( $args[0] ) ) {
+ $xml = $args[0];
+ } else {
+ $xml = false;
+ }
+ $cs->check( $fix, $xml );
+}
+
+
+//----------------------------------------------------------------------------------
+
+class CheckStorage
+{
+ var $oldIdMap, $errors;
+ var $dbStore = null;
+
+ var $errorDescriptions = array(
+ '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 = '' ) {
+ $fname = 'checkStorage';
+ $dbr =& wfGetDB( DB_SLAVE );
+ if ( $fix ) {
+ $dbw =& wfGetDB( DB_MASTER );
+ print "Checking, will fix errors if possible...\n";
+ } else {
+ print "Checking...\n";
+ }
+ $maxRevId = $dbr->selectField( 'revision', 'MAX(rev_id)', false, $fname );
+ $chunkSize = 1000;
+ $flagStats = array();
+ $objectStats = array();
+ $knownFlags = array( 'external', 'gzip', 'object', 'utf-8' );
+ $this->errors = array(
+ 'restore text' => array(),
+ 'restore revision' => array(),
+ 'unfixable' => array(),
+ 'fixed' => array(),
+ 'fixable' => array(),
+ );
+
+ for ( $chunkStart = 1 ; $chunkStart < $maxRevId; $chunkStart += $chunkSize ) {
+ $chunkEnd = $chunkStart + $chunkSize - 1;
+ //print "$chunkStart of $maxRevId\n";
+
+ // Fetch revision rows
+ $this->oldIdMap = array();
+ $dbr->ping();
+ $res = $dbr->select( 'revision', array( 'rev_id', 'rev_text_id' ),
+ array( "rev_id BETWEEN $chunkStart AND $chunkEnd" ), $fname );
+ while ( $row = $dbr->fetchObject( $res ) ) {
+ $this->oldIdMap[$row->rev_id] = $row->rev_text_id;
+ }
+ $dbr->freeResult( $res );
+
+ if ( !count( $this->oldIdMap ) ) {
+ continue;
+ }
+
+ // Fetch old_flags
+ $missingTextRows = array_flip( $this->oldIdMap );
+ $externalRevs = array();
+ $objectRevs = array();
+ $res = $dbr->select( 'text', array( 'old_id', 'old_flags' ),
+ 'old_id IN (' . implode( ',', $this->oldIdMap ) . ')', $fname );
+ while ( $row = $dbr->fetchObject( $res ) ) {
+ $flags = $row->old_flags;
+ $id = $row->old_id;
+
+ // Create flagStats row if it doesn't exist
+ $flagStats = $flagStats + array( $flags => 0 );
+ // Increment counter
+ $flagStats[$flags]++;
+
+ // Not missing
+ unset( $missingTextRows[$row->old_id] );
+
+ // Check for external or object
+ if ( $flags == '' ) {
+ $flagArray = array();
+ } 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->error( 'fixed', "Warning: old_flags set to 0", $id );
+ $dbw->ping();
+ $dbw->update( 'text', array( 'old_flags' => '' ),
+ array( 'old_id' => $id ), $fname );
+ echo "Fixed\n";
+ } else {
+ $this->error( 'fixable', "Warning: old_flags set to 0", $id );
+ }
+ } elseif ( count( array_diff( $flagArray, $knownFlags ) ) ) {
+ $this->error( 'unfixable', "Error: invalid flags field \"$flags\"", $id );
+ }
+ }
+ $dbr->freeResult( $res );
+
+ // Output errors for any missing text rows
+ foreach ( $missingTextRows as $oldId => $revId ) {
+ $this->error( 'restore revision', "Error: missing text row", $oldId );
+ }
+
+ // Verify external revisions
+ $externalConcatBlobs = array();
+ $externalNormalBlobs = array();
+ if ( count( $externalRevs ) ) {
+ $res = $dbr->select( 'text', array( 'old_id', 'old_flags', 'old_text' ),
+ array( 'old_id IN (' . implode( ',', $externalRevs ) . ')' ), $fname );
+ while ( $row = $dbr->fetchObject( $res ) ) {
+ $urlParts = explode( '://', $row->old_text, 2 );
+ if ( count( $urlParts ) !== 2 || $urlParts[1] == '' ) {
+ $this->error( 'restore text', "Error: invalid URL \"{$row->old_text}\"", $row->old_id );
+ continue;
+ }
+ list( $proto, $path ) = $urlParts;
+ if ( $proto != 'DB' ) {
+ $this->error( 'restore text', "Error: invalid external protocol \"$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,
+ array( 'blob_id' ),
+ array( 'blob_id IN( ' . implode( ',', $blobIds ) . ')' ), $fname );
+ while ( $row = $extDb->fetchObject( $res ) ) {
+ unset( $xBlobIds[$row->blob_id] );
+ }
+ $extDb->freeResult( $res );
+ // Print errors for missing blobs rows
+ foreach ( $xBlobIds as $blobId => $oldId ) {
+ $this->error( 'restore text', "Error: missing target $blobId for one-part ES URL", $oldId );
+ }
+ }
+ }
+
+ // Check local objects
+ $dbr->ping();
+ $concatBlobs = array();
+ $curIds = array();
+ if ( count( $objectRevs ) ) {
+ $headerLength = 300;
+ $res = $dbr->select( 'text', array( 'old_id', 'old_flags', "LEFT(old_text, $headerLength) AS header" ),
+ array( 'old_id IN (' . implode( ',', $objectRevs ) . ')' ), $fname );
+ while ( $row = $dbr->fetchObject( $res ) ) {
+ $oldId = $row->old_id;
+ if ( !preg_match( '/^O:(\d+):"(\w+)"/', $row->header, $matches ) ) {
+ $this->error( 'restore text', "Error: invalid object header", $oldId );
+ continue;
+ }
+
+ $className = strtolower( $matches[2] );
+ if ( strlen( $className ) != $matches[1] ) {
+ $this->error( 'restore text', "Error: invalid object header, wrong class name length", $oldId );
+ continue;
+ }
+
+ $objectStats = $objectStats + array( $className => 0 );
+ $objectStats[$className]++;
+
+ switch ( $className ) {
+ case 'concatenatedgziphistoryblob':
+ // Good
+ break;
+ case 'historyblobstub':
+ case 'historyblobcurstub':
+ if ( strlen( $row->header ) == $headerLength ) {
+ $this->error( 'unfixable', "Error: overlong stub header", $oldId );
+ continue;
+ }
+ $stubObj = unserialize( $row->header );
+ if ( !is_object( $stubObj ) ) {
+ $this->error( 'restore text', "Error: unable to unserialize stub object", $oldId );
+ continue;
+ }
+ if ( $className == 'historyblobstub' ) {
+ $concatBlobs[$stubObj->mOldId][] = $oldId;
+ } else {
+ $curIds[$stubObj->mCurId][] = $oldId;
+ }
+ break;
+ default:
+ $this->error( 'unfixable', "Error: unrecognised object class \"$className\"", $oldId );
+ }
+ }
+ $dbr->freeResult( $res );
+ }
+
+ // Check local concat blob validity
+ $externalConcatBlobs = array();
+ if ( count( $concatBlobs ) ) {
+ $headerLength = 300;
+ $res = $dbr->select( 'text', array( 'old_id', 'old_flags', "LEFT(old_text, $headerLength) AS header" ),
+ array( 'old_id IN (' . implode( ',', array_keys( $concatBlobs ) ) . ')' ), $fname );
+ while ( $row = $dbr->fetchObject( $res ) ) {
+ $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:' ) {
+ $this->error( 'unfixable', "Error: unrecognised external storage type \"{$urlParts[0]}", $row->old_id );
+ } else {
+ $cluster = $urlParts[2];
+ $id = $urlParts[3];
+ if ( !isset( $externalConcatBlobs[$cluster][$id] ) ) {
+ $externalConcatBlobs[$cluster][$id] = array();
+ }
+ $externalConcatBlobs[$cluster][$id] = array_merge(
+ $externalConcatBlobs[$cluster][$id], $concatBlobs[$row->old_id]
+ );
+ }
+ } else {
+ $this->error( 'unfixable', "Error: invalid flags \"{$row->old_flags}\" on concat bulk row {$row->old_id}",
+ $concatBlobs[$row->old_id] );
+ }
+ } elseif ( strcasecmp( substr( $row->header, 0, strlen( CONCAT_HEADER ) ), CONCAT_HEADER ) ) {
+ $this->error( 'restore text', "Error: Incorrect object header for concat bulk row {$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 error( $type, $msg, $ids ) {
+ if ( is_array( $ids ) && count( $ids ) == 1 ) {
+ $ids = reset( $ids );
+ }
+ if ( is_array( $ids ) ) {
+ $revIds = array();
+ 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 ) {
+ $fname = 'CheckStorage::checkExternalConcatBlobs';
+ 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( CONCAT_HEADER );
+ $res = $extDb->select( $blobsTable,
+ array( 'blob_id', "LEFT(blob_text, $headerLength) AS header" ),
+ array( 'blob_id IN( ' . implode( ',', $blobIds ) . ')' ), $fname );
+ while ( $row = $extDb->fetchObject( $res ) ) {
+ if ( strcasecmp( $row->header, CONCAT_HEADER ) ) {
+ $this->error( '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 => $oldIds ) {
+ $this->error( 'restore text', "Error: missing target $cluster/$blobId for two-part ES URL", $oldIds );
+ }
+ }
+ }
+
+ function restoreText( $revIds, $xml ) {
+ global $wgTmpDirectory, $wgDBname;
+
+ if ( !count( $revIds ) ) {
+ return;
+ }
+
+ print "Restoring text from XML backup...\n";
+
+ $revFileName = "$wgTmpDirectory/broken-revlist-$wgDBname";
+ $filteredXmlFileName = "$wgTmpDirectory/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_SLAVE );
+ $dbw =& wfGetDB( DB_MASTER );
+ $dbr->ping();
+ $dbw->ping();
+
+ $source = new ImportStreamSource( $file );
+ $importer = new WikiImporter( $source );
+ $importer->setRevisionCallback( array( &$this, 'importRevision' ) );
+ $importer->doImport();
+ }
+
+ function importRevision( &$revision, &$importer ) {
+ $fname = 'CheckStorage::importRevision';
+
+ $id = $revision->getID();
+ $text = $revision->getText();
+ 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
+ $id = $id ? $id : '';
+ 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_SLAVE );
+ $oldId = $dbr->selectField( 'revision', 'rev_text_id', array( 'rev_id' => $id ), $fname );
+ if ( !$oldId ) {
+ echo "Missing revision row for rev_id $id\n";
+ return;
+ }
+
+ // Compress the text
+ $flags = Revision::compressRevisionText( $text );
+
+ // Update the text row
+ $dbw->update( 'text',
+ array( 'old_flags' => $flags, 'old_text' => $text ),
+ array( 'old_id' => $oldId ),
+ $fname, array( '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;
+ }
+}
+?>
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