maintenance/storage/resolveStubs.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup Maintenance ExternalStorage
   5  */
   6
   7 define( 'REPORTING_INTERVAL', 100 );
   8
   9 if ( !defined( 'MEDIAWIKI' ) ) {
  10         $optionsWithArgs = array( 'm' );
  11
  12         require_once( dirname(__FILE__) . '/../commandLine.inc' );
  13
  14         resolveStubs();
  15 }
  16
  17 /**
  18  * Convert history stubs that point to an external row to direct
  19  * external pointers
  20  */
  21 function resolveStubs() {
  22         $fname = 'resolveStubs';
  23
  24         $dbr = wfGetDB( DB_SLAVE );
  25         $maxID = $dbr->selectField( 'text', 'MAX(old_id)', false, $fname );
  26         $blockSize = 10000;
  27         $numBlocks = intval( $maxID / $blockSize ) + 1;
  28
  29         for ( $b = 0; $b < $numBlocks; $b++ ) {
  30                 wfWaitForSlaves( 2 );
  31
  32                 printf( "%5.2f%%\n", $b / $numBlocks * 100 );
  33                 $start = intval($maxID / $numBlocks) * $b + 1;
  34                 $end = intval($maxID / $numBlocks) * ($b + 1);
  35
  36                 $res = $dbr->select( 'text', array( 'old_id', 'old_text', 'old_flags' ),
  37                         "old_id>=$start AND old_id<=$end " .
  38                         "AND old_flags LIKE '%object%' AND old_flags NOT LIKE '%external%' ".
  39                         'AND LOWER(CONVERT(LEFT(old_text,22) USING latin1)) = \'o:15:"historyblobstub"\'',
  40                         $fname );
  41                 while ( $row = $dbr->fetchObject( $res ) ) {
  42                         resolveStub( $row->old_id, $row->old_text, $row->old_flags );
  43                 }
  44                 $dbr->freeResult( $res );
  45
  46
  47         }
  48         print "100%\n";
  49 }
  50
  51 /**
  52  * Resolve a history stub
  53  */
  54 function resolveStub( $id, $stubText, $flags ) {
  55         $fname = 'resolveStub';
  56
  57         $stub = unserialize( $stubText );
  58         $flags = explode( ',', $flags );
  59
  60         $dbr = wfGetDB( DB_SLAVE );
  61         $dbw = wfGetDB( DB_MASTER );
  62
  63         if ( strtolower( get_class( $stub ) ) !== 'historyblobstub' ) {
  64                 print "Error found object of class " . get_class( $stub ) . ", expecting historyblobstub\n";
  65                 return;
  66         }
  67
  68         # Get the (maybe) external row
  69         $externalRow = $dbr->selectRow( 'text', array( 'old_text' ),
  70                 array( 'old_id' => $stub->mOldId, 'old_flags' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ) ),
  71                 $fname
  72         );
  73
  74         if ( !$externalRow ) {
  75                 # Object wasn't external
  76                 return;
  77         }
  78
  79         # Preserve the legacy encoding flag, but switch from object to external
  80         if ( in_array( 'utf-8', $flags ) ) {
  81                 $newFlags = 'external,utf-8';
  82         } else {
  83                 $newFlags = 'external';
  84         }
  85
  86         # Update the row
  87         #print "oldid=$id\n";
  88         $dbw->update( 'text',
  89                 array( /* SET */
  90                         'old_flags' => $newFlags,
  91                         'old_text' => $externalRow->old_text . '/' . $stub->mHash
  92                 ),
  93                 array( /* WHERE */
  94                         'old_id' => $id
  95                 ), $fname
  96         );
  97 }
  98