maintenance/storage/resolveStubs.php

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