maintenance/storage/resolveStubs.php

   1 <?php
   2 /**
   3  * Convert history stubs that point to an external row to direct external
   4  * pointers.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  * @ingroup Maintenance ExternalStorage
  23  */
  24
  25 if ( !defined( 'MEDIAWIKI' ) ) {
  26         $optionsWithArgs = [ 'm' ];
  27
  28         require_once __DIR__ . '/../commandLine.inc';
  29
  30         resolveStubs();
  31 }
  32
  33 /**
  34  * Convert history stubs that point to an external row to direct
  35  * external pointers
  36  */
  37 function resolveStubs() {
  38         $fname = 'resolveStubs';
  39
  40         $dbr = wfGetDB( DB_REPLICA );
  41         $maxID = $dbr->selectField( 'text', 'MAX(old_id)', false, $fname );
  42         $blockSize = 10000;
  43         $numBlocks = intval( $maxID / $blockSize ) + 1;
  44
  45         for ( $b = 0; $b < $numBlocks; $b++ ) {
  46                 wfWaitForSlaves();
  47
  48                 printf( "%5.2f%%\n", $b / $numBlocks * 100 );
  49                 $start = intval( $maxID / $numBlocks ) * $b + 1;
  50                 $end = intval( $maxID / $numBlocks ) * ( $b + 1 );
  51
  52                 $res = $dbr->select( 'text', [ 'old_id', 'old_text', 'old_flags' ],
  53                         "old_id>=$start AND old_id<=$end " .
  54                         "AND old_flags LIKE '%object%' AND old_flags NOT LIKE '%external%' " .
  55                         'AND LOWER(CONVERT(LEFT(old_text,22) USING latin1)) = \'o:15:"historyblobstub"\'',
  56                         $fname );
  57                 foreach ( $res as $row ) {
  58                         resolveStub( $row->old_id, $row->old_text, $row->old_flags );
  59                 }
  60         }
  61         print "100%\n";
  62 }
  63
  64 /**
  65  * Resolve a history stub
  66  * @param int $id
  67  * @param string $stubText
  68  * @param string $flags
  69  */
  70 function resolveStub( $id, $stubText, $flags ) {
  71         $fname = 'resolveStub';
  72
  73         $stub = unserialize( $stubText );
  74         $flags = explode( ',', $flags );
  75
  76         $dbr = wfGetDB( DB_REPLICA );
  77         $dbw = wfGetDB( DB_MASTER );
  78
  79         if ( strtolower( get_class( $stub ) ) !== 'historyblobstub' ) {
  80                 print "Error found object of class " . get_class( $stub ) . ", expecting historyblobstub\n";
  81
  82                 return;
  83         }
  84
  85         # Get the (maybe) external row
  86         $externalRow = $dbr->selectRow(
  87                 'text',
  88                 [ 'old_text' ],
  89                 [
  90                         'old_id' => $stub->mOldId,
  91                         'old_flags' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() )
  92                 ],
  93                 $fname
  94         );
  95
  96         if ( !$externalRow ) {
  97                 # Object wasn't external
  98                 return;
  99         }
 100
 101         # Preserve the legacy encoding flag, but switch from object to external
 102         if ( in_array( 'utf-8', $flags ) ) {
 103                 $newFlags = 'external,utf-8';
 104         } else {
 105                 $newFlags = 'external';
 106         }
 107
 108         # Update the row
 109         # print "oldid=$id\n";
 110         $dbw->update( 'text',
 111                 [ /* SET */
 112                         'old_flags' => $newFlags,
 113                         'old_text' => $externalRow->old_text . '/' . $stub->mHash
 114                 ],
 115                 [ /* WHERE */
 116                         'old_id' => $id
 117                 ], $fname
 118         );
 119 }