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         print "Retrieving stub rows...\n";
  22         $dbr =& wfGetDB( DB_SLAVE );
  23         $maxID = $dbr->selectField( 'text', 'MAX(old_id)', false, $fname );
  24         $stubs = array();
  25         $flagsArray = array();
  26
  27         # Do it in 100 blocks
  28         for ( $b = 0; $b < 100; $b++ ) {
  29                 print "$b%\r";
  30                 $start = intval($maxID / 100) * $b + 1;
  31                 $end = intval($maxID / 100) * ($b + 1);
  32
  33                 $res = $dbr->select( 'text', array( 'old_id', 'old_text', 'old_flags' ),
  34                         "old_id>=$start AND old_id<=$end AND old_flags like '%object%' ".
  35                         "AND old_text LIKE 'O:15:\"historyblobstub\"%'", $fname );
  36                 while ( $row = $dbr->fetchObject( $res ) ) {
  37                         $stubs[$row->old_id] = $row->old_text;
  38                         $flagsArray[$row->old_id] = $row->old_flags;
  39                 }
  40                 $dbr->freeResult( $res );
  41         }
  42         print "100%\n";
  43
  44         print "\nConverting " . count( $stubs ) . " rows ...\n";
  45
  46         # Get master database, no transactions
  47         $dbw =& wfGetDB( DB_MASTER );
  48         $dbw->clearFlag( DBO_TRX );
  49         $dbw->immediateCommit();
  50
  51         $i = 0;
  52         foreach( $stubs as $id => $stub ) {
  53                 if ( !(++$i % REPORTING_INTERVAL) ) {
  54                         print "$i\n";
  55                         wfWaitForSlaves( 5 );
  56                 }
  57
  58                 resolveStub( $id, $stub, $flagsArray[$id] );
  59         }
  60 }
  61
  62 /**
  63  * Resolve a history stub
  64  */
  65 function resolveStub( $id, $stubText, $flags ) {
  66         $fname = 'resolveStub';
  67
  68         $stub = unserialize( $stubText );
  69         $flags = explode( ',', $flags );
  70
  71         $dbr =& wfGetDB( DB_SLAVE );
  72         $dbw =& wfGetDB( DB_MASTER );
  73
  74         if ( get_class( $stub ) !== 'historyblobstub' ) {
  75                 print "Error, invalid stub object\n";
  76                 return;
  77         }
  78
  79         # Get the (maybe) external row
  80         $externalRow = $dbr->selectRow( 'text', array( 'old_text' ),
  81                 array( 'old_id' => $stub->mOldId, "old_flags LIKE '%external%'" ),
  82                 $fname
  83         );
  84
  85         if ( !$externalRow ) {
  86                 # Object wasn't external
  87                 continue;
  88         }
  89
  90         # Preserve the legacy encoding flag, but switch from object to external
  91         if ( in_array( 'utf-8', $flags ) ) {
  92                 $newFlags = 'external,utf-8';
  93         } else {
  94                 $newFlags = 'external';
  95         }
  96
  97         # Update the row
  98         $dbw->update( 'text',
  99                 array( /* SET */
 100                         'old_flags' => $newFlags,
 101                         'old_text' => $externalRow->old_text . '/' . $stub->mHash
 102                 ),
 103                 array( /* WHERE */
 104                         'old_id' => $id
 105                 ), $fname
 106         );
 107 }
 108 ?>