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