maintenance/fetchText.php

   1 <?php
   2 /**
   3  * Communications protocol.
   4  * This is used by dumpTextPass.php when the --spawn option is present.
   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
  23  */
  24
  25 require_once __DIR__ . '/Maintenance.php';
  26
  27 /**
  28  * Maintenance script used to fetch page text in a subprocess.
  29  *
  30  * @ingroup Maintenance
  31  */
  32 class FetchText extends Maintenance {
  33         public function __construct() {
  34                 parent::__construct();
  35                 $this->mDescription = "Fetch the raw revision blob from an old_id.";
  36                 $this->mDescription .= "\nNOTE: Export transformations are NOT applied. This is left to backupTextPass.php";
  37         }
  38
  39         /**
  40          * returns a string containing the following in order:
  41          *   textid
  42          *   \n
  43          *   length of text (-1 on error = failure to retrieve/unserialize/gunzip/etc)
  44          *   \n
  45          *   text  (may be empty)
  46          *
  47          * note that the text string itself is *not* followed by newline
  48          */
  49         public function execute() {
  50                 $db = wfGetDB( DB_SLAVE );
  51                 $stdin = $this->getStdin();
  52                 while ( !feof( $stdin ) ) {
  53                         $line = fgets( $stdin );
  54                         if ( $line === false ) {
  55                                 // We appear to have lost contact...
  56                                 break;
  57                         }
  58                         $textId = intval( $line );
  59                         $text = $this->doGetText( $db, $textId );
  60                         if ( $text === false ) {
  61                                 # actual error, not zero-length text
  62                                 $textLen = "-1";
  63                         } else {
  64                                 $textLen = strlen( $text );
  65                         }
  66                         $this->output( $textId . "\n" . $textLen . "\n" . $text );
  67                 }
  68         }
  69
  70         /**
  71          * May throw a database error if, say, the server dies during query.
  72          * @param DatabaseBase $db
  73          * @param int $id The old_id
  74          * @return string
  75          */
  76         private function doGetText( $db, $id ) {
  77                 $id = intval( $id );
  78                 $row = $db->selectRow( 'text',
  79                         array( 'old_text', 'old_flags' ),
  80                         array( 'old_id' => $id ),
  81                         __METHOD__ );
  82                 $text = Revision::getRevisionText( $row );
  83                 if ( $text === false ) {
  84                         return false;
  85                 }
  86
  87                 return $text;
  88         }
  89 }
  90
  91 $maintClass = "FetchText";
  92 require_once RUN_MAINTENANCE_IF_MAIN;