maintenance/compressOld.inc

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * @subpackage Maintenance
   5  */
   6
   7 /** */
   8 function compressOldPages( $start = 0 ) {
   9         $fname = 'compressOldPages';
  10
  11         $chunksize = 50;
  12         print "Starting from old_id $start...\n";
  13         $dbw =& wfGetDB( DB_MASTER );
  14         $old = $dbw->tableName( 'old' );
  15         do {
  16                 $end = $start + $chunksize;
  17                 $res = $dbw->select( 'old', array( 'old_id','old_flags','old_namespace','old_title','old_text' ),
  18                         "old_id>=$start", $fname, array( 'ORDER BY' => 'old_id', 'LIMIT' => $chunksize, 'FOR UPDATE' ) );
  19                 if( $dbw->numRows( $res ) == 0 ) {
  20                         break;
  21                 }
  22                 $last = $start;
  23                 while( $row = $dbw->fetchObject( $res ) ) {
  24                         # print "  {$row->old_id} - {$row->old_namespace}:{$row->old_title}\n";
  25                         compressPage( $row );
  26                         $last = $row->old_id;
  27                 }
  28                 $dbw->freeResult( $res );
  29                 $start = $last + 1; # Deletion may leave long empty stretches
  30                 print "$start...\n";
  31         } while( true );
  32 }
  33
  34 function compressPage( $row ) {
  35         $fname = 'compressPage';
  36         if( false !== strpos( $row->old_flags, "gzip" ) ) {
  37                 print "Already compressed row {$row->old_id}?\n";
  38                 return false;
  39         }
  40         $dbw =& wfGetDB( DB_MASTER );
  41         $flags = $row->old_flags ? "{$row->old_flags},gzip" : "gzip";
  42         $compress = gzdeflate( $row->old_text );
  43         $dbw->update( 'old',
  44                 array( /* SET */
  45                         'old_flags' => $flags,
  46                         'old_text' => $compress
  47                 ), array( /* WHERE */
  48                         'old_id' => $row->old_id
  49                 ), $fname, 'LIMIT 1'
  50         );
  51         return true;
  52 }
  53
  54 define( 'LS_INDIVIDUAL', 0 );
  55 define( 'LS_CHUNKED', 1 );
  56
  57 function compressWithConcat( $startId, $maxChunkSize, $maxChunkFactor, $factorThreshold, $beginDate, $endDate )
  58 {
  59         $fname = 'compressWithConcat';
  60         $loadStyle = LS_CHUNKED;
  61
  62         $dbw =& wfGetDB( DB_MASTER );
  63
  64         # First get a list of all pages
  65         $pageRes = $dbw->select( 'cur', array('cur_namespace', 'cur_title'), false, $fname );
  66
  67         # For each of those, get a list of revisions which fit the criteria
  68         $conds = array();
  69         if ( $beginDate ) {
  70                 $conds[] = "old_timestamp>'" . $beginDate . "'";
  71         }
  72         if ( $endDate )  {
  73                 $conds[] = "old_timestamp<'" . $endDate . "'";
  74         }
  75         if ( $startId ) {
  76                 $conds[] = 'old_id>=' . $startId;
  77         }
  78         if ( $loadStyle == LS_CHUNKED ) {
  79                 $fields = array( 'old_id', 'old_flags', 'old_text' );
  80                 $revLoadOptions = 'FOR UPDATE';
  81         } else {
  82                 $fields = array( 'old_id' );
  83                 $revLoadOptions = array();
  84         }
  85
  86         while ( $pageRow = $dbw->fetchObject( $pageRes ) ) {
  87                 # Display progress
  88                 $titleObj = Title::makeTitle( $pageRow->cur_namespace, $pageRow->cur_title );
  89                 print $titleObj->getPrefixedDBkey() . " ";
  90
  91                 # Load revisions
  92                 $revRes = $dbw->select( 'old', $fields,
  93                         array( 'old_namespace' => $pageRow->cur_namespace, 'old_title' => $pageRow->cur_title ) + $conds,
  94                         $fname,
  95                         $revLoadOptions
  96                 );
  97                 $revs = array();
  98                 while ( $revRow = $dbw->fetchObject( $revRes ) ) {
  99                         $revs[] = $revRow;
 100                 }
 101
 102                 if ( count( $revs ) < 2) {
 103                         # No revisions matching, no further processing
 104                         print "\n";
 105                         continue;
 106                 }
 107
 108                 # For each chunk
 109                 $i = 0;
 110                 while ( $i < count( $revs ) ) {
 111                         if ( $i < count( $revs ) - $maxChunkSize ) {
 112                                 $thisChunkSize = $maxChunkSize;
 113                         } else {
 114                                 $thisChunkSize = count( $revs ) - $i;
 115                         }
 116
 117                         $chunk = new ConcatenatedGzipHistoryBlob();
 118                         $stubs = array();
 119                         $dbw->begin();
 120                         $usedChunk = false;
 121                         $primaryOldid = $revs[$i]->old_id;
 122
 123                         # Get the text of each revision and add it to the object
 124                         for ( $j = 0; $j < $thisChunkSize && $chunk->isHappy( $maxChunkFactor, $factorThreshold ); $j++ ) {
 125                                 $oldid = $revs[$i + $j]->old_id;
 126
 127                                 # Get text
 128                                 if ( $loadStyle == LS_INDIVIDUAL ) {
 129                                         $textRow = $dbw->selectRow( 'old',
 130                                                 array( 'old_flags', 'old_text' ),
 131                                                 array( 'old_id' => $oldid ),
 132                                                 $fname,
 133                                                 'FOR UPDATE'
 134                                         );
 135                                         $text = Article::getRevisionText( $textRow );
 136                                 } else {
 137                                         $text = Article::getRevisionText( $revs[$i + $j] );
 138                                 }
 139
 140                                 if ( $text === false ) {
 141                                         print "\nError, unable to get text in old_id $oldid\n";
 142                                         #$dbw->delete( 'old', array( 'old_id' => $oldid ) );
 143                                 }
 144
 145                                 if ( $j == 0 ) {
 146                                         $chunk->setText( $text );
 147                                         print '.';
 148                                 } else {
 149                                         # Don't make a stub if it's going to be longer than the article
 150                                         # Stubs are typically about 100 bytes
 151                                         if ( strlen( $text ) < 120 ) {
 152                                                 $stub = false;
 153                                                 print 'x';
 154                                         } else {
 155                                                 $stub = $chunk->addItem( $text );
 156                                                 $stub->setLocation( $primaryOldid );
 157                                                 $hash = $stub->getHash();
 158                                                 $stub = serialize( $stub );
 159                                                 print '.';
 160                                                 $usedChunk = true;
 161                                         }
 162                                         $stubs[$j] = $stub;
 163                                 }
 164                         }
 165                         $thisChunkSize = $j;
 166
 167                         # If we couldn't actually use any stubs because the pages were too small, do nothing
 168                         if ( $usedChunk ) {
 169                                 # Store the main object
 170                                 $dbw->update( 'old',
 171                                         array( /* SET */
 172                                                 'old_text' => serialize( $chunk ),
 173                                                 'old_flags' => 'object',
 174                                         ), array( /* WHERE */
 175                                                 'old_id' => $primaryOldid
 176                                         )
 177                                 );
 178
 179                                 # Store the stub objects
 180                                 for ( $j = 1; $j < $thisChunkSize; $j++ ) {
 181                                         # Skip if not compressing
 182                                         if ( $stubs[$j] !== false ) {
 183                                                 $dbw->update( 'old',
 184                                                         array( /* SET */
 185                                                                 'old_text' => $stubs[$j],
 186                                                                 'old_flags' => 'object',
 187                                                         ), array( /* WHERE */
 188                                                                 'old_id' => $revs[$i + $j]->old_id
 189                                                         )
 190                                                 );
 191                                         }
 192                                 }
 193                         }
 194                         # Done, next
 195                         print "/";
 196                         $dbw->commit();
 197                         $i += $thisChunkSize;
 198                 }
 199                 print "\n";
 200         }
 201         return true;
 202 }
 203 ?>