maintenance/compressOld.inc

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * @subpackage Maintenance
   5  */
   6
   7 /** */
   8 require_once( '../includes/Revision.php' );
   9
  10 /** @todo document */
  11 function compressOldPages( $start = 0 ) {
  12         $fname = 'compressOldPages';
  13
  14         $chunksize = 50;
  15         print "Starting from old_id $start...\n";
  16         $dbw =& wfGetDB( DB_MASTER );
  17         $old = $dbw->tableName( 'old' );
  18         do {
  19                 $end = $start + $chunksize;
  20                 $res = $dbw->select( 'old', array( 'old_id','old_flags','old_namespace','old_title','old_text' ),
  21                         "old_id>=$start", $fname, array( 'ORDER BY' => 'old_id', 'LIMIT' => $chunksize, 'FOR UPDATE' ) );
  22                 if( $dbw->numRows( $res ) == 0 ) {
  23                         break;
  24                 }
  25                 $last = $start;
  26                 while( $row = $dbw->fetchObject( $res ) ) {
  27                         # print "  {$row->old_id} - {$row->old_namespace}:{$row->old_title}\n";
  28                         compressPage( $row );
  29                         $last = $row->old_id;
  30                 }
  31                 $dbw->freeResult( $res );
  32                 $start = $last + 1; # Deletion may leave long empty stretches
  33                 print "$start...\n";
  34         } while( true );
  35 }
  36
  37 /** @todo document */
  38 function compressPage( $row ) {
  39         $fname = 'compressPage';
  40         if( false !== strpos( $row->old_flags, "gzip" ) ) {
  41                 print "Already compressed row {$row->old_id}?\n";
  42                 return false;
  43         }
  44         $dbw =& wfGetDB( DB_MASTER );
  45         $flags = $row->old_flags ? "{$row->old_flags},gzip" : "gzip";
  46         $compress = gzdeflate( $row->old_text );
  47         $dbw->update( 'old',
  48                 array( /* SET */
  49                         'old_flags' => $flags,
  50                         'old_text' => $compress
  51                 ), array( /* WHERE */
  52                         'old_id' => $row->old_id
  53                 ), $fname, 'LIMIT 1'
  54         );
  55         return true;
  56 }
  57
  58 define( 'LS_INDIVIDUAL', 0 );
  59 define( 'LS_CHUNKED', 1 );
  60
  61 /** @todo document */
  62 function compressWithConcat( $startId, $maxChunkSize, $maxChunkFactor, $factorThreshold, $beginDate, $endDate )
  63 {
  64         $fname = 'compressWithConcat';
  65         $loadStyle = LS_CHUNKED;
  66
  67         $dbw =& wfGetDB( DB_MASTER );
  68
  69         # First get a list of all pages
  70         $pageRes = $dbw->select( 'page', 'page_id', false, $fname );
  71
  72         # For each of those, get a list of revisions which fit the criteria
  73         $conds = array();
  74         if ( $beginDate ) {
  75                 $conds[] = "rev_timestamp>'" . $beginDate . "'";
  76         }
  77         if ( $endDate )  {
  78                 $conds[] = "rev_timestamp<'" . $endDate . "'";
  79         }
  80         if ( $startId ) {
  81                 $conds[] = 'rev_id>=' . $startId;
  82         }
  83         if ( $loadStyle == LS_CHUNKED ) {
  84                 $tables = array( 'revision', 'text' );
  85                 $fields = array( 'rev_id', 'old_flags', 'old_text' );
  86                 $conds[] = 'rev_id=old_id';
  87                 $revLoadOptions = 'FOR UPDATE';
  88         } else {
  89                 $tables = array( 'revision' );
  90                 $fields = array( 'rev_id' );
  91                 $revLoadOptions = array();
  92         }
  93
  94         while ( $pageRow = $dbw->fetchObject( $pageRes ) ) {
  95                 # Display progress
  96                 $titleObj = Title::makeTitle( $pageRow->cur_namespace, $pageRow->cur_title );
  97                 print $titleObj->getPrefixedDBkey() . " ";
  98
  99                 # Load revisions
 100                 $revRes = $dbw->select( 'old', $fields,
 101                         array( 'rev_page' => $pageRow->page_id ) + $conds,
 102                         $fname,
 103                         $revLoadOptions
 104                 );
 105                 $revs = array();
 106                 while ( $revRow = $dbw->fetchObject( $revRes ) ) {
 107                         $revs[] = $revRow;
 108                 }
 109
 110                 if ( count( $revs ) < 2) {
 111                         # No revisions matching, no further processing
 112                         print "\n";
 113                         continue;
 114                 }
 115
 116                 # For each chunk
 117                 $i = 0;
 118                 while ( $i < count( $revs ) ) {
 119                         if ( $i < count( $revs ) - $maxChunkSize ) {
 120                                 $thisChunkSize = $maxChunkSize;
 121                         } else {
 122                                 $thisChunkSize = count( $revs ) - $i;
 123                         }
 124
 125                         $chunk = new ConcatenatedGzipHistoryBlob();
 126                         $stubs = array();
 127                         $dbw->begin();
 128                         $usedChunk = false;
 129                         $primaryOldid = $revs[$i]->rev_id;
 130
 131                         # Get the text of each revision and add it to the object
 132                         for ( $j = 0; $j < $thisChunkSize && $chunk->isHappy( $maxChunkFactor, $factorThreshold ); $j++ ) {
 133                                 $oldid = $revs[$i + $j]->rev_id;
 134
 135                                 # Get text
 136                                 if ( $loadStyle == LS_INDIVIDUAL ) {
 137                                         $textRow = $dbw->selectRow( 'text',
 138                                                 array( 'old_flags', 'old_text' ),
 139                                                 array( 'old_id' => $oldid ),
 140                                                 $fname,
 141                                                 'FOR UPDATE'
 142                                         );
 143                                         $text = Revision::getRevisionText( $textRow );
 144                                 } else {
 145                                         $text = Revision::getRevisionText( $revs[$i + $j] );
 146                                 }
 147
 148                                 if ( $text === false ) {
 149                                         print "\nError, unable to get text in old_id $oldid\n";
 150                                         #$dbw->delete( 'old', array( 'old_id' => $oldid ) );
 151                                 }
 152
 153                                 if ( $j == 0 ) {
 154                                         $chunk->setText( $text );
 155                                         print '.';
 156                                 } else {
 157                                         # Don't make a stub if it's going to be longer than the article
 158                                         # Stubs are typically about 100 bytes
 159                                         if ( strlen( $text ) < 120 ) {
 160                                                 $stub = false;
 161                                                 print 'x';
 162                                         } else {
 163                                                 $stub = $chunk->addItem( $text );
 164                                                 $stub->setLocation( $primaryOldid );
 165                                                 $hash = $stub->getHash();
 166                                                 $stub = serialize( $stub );
 167                                                 print '.';
 168                                                 $usedChunk = true;
 169                                         }
 170                                         $stubs[$j] = $stub;
 171                                 }
 172                         }
 173                         $thisChunkSize = $j;
 174
 175                         # If we couldn't actually use any stubs because the pages were too small, do nothing
 176                         if ( $usedChunk ) {
 177                                 # Store the main object
 178                                 $dbw->update( 'text',
 179                                         array( /* SET */
 180                                                 'old_text' => serialize( $chunk ),
 181                                                 'old_flags' => 'object',
 182                                         ), array( /* WHERE */
 183                                                 'old_id' => $primaryOldid
 184                                         )
 185                                 );
 186
 187                                 # Store the stub objects
 188                                 for ( $j = 1; $j < $thisChunkSize; $j++ ) {
 189                                         # Skip if not compressing
 190                                         if ( $stubs[$j] !== false ) {
 191                                                 $dbw->update( 'text',
 192                                                         array( /* SET */
 193                                                                 'old_text' => $stubs[$j],
 194                                                                 'old_flags' => 'object',
 195                                                         ), array( /* WHERE */
 196                                                                 'old_id' => $revs[$i + $j]->old_id
 197                                                         )
 198                                                 );
 199                                         }
 200                                 }
 201                         }
 202                         # Done, next
 203                         print "/";
 204                         $dbw->commit();
 205                         $i += $thisChunkSize;
 206                 }
 207                 print "\n";
 208         }
 209         return true;
 210 }
 211 ?>