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 revision text from an old_id";
  36         }
  37
  38         /**
  39          * returns a string containing the following in order:
  40          *   textid
  41          *   \n
  42          *   length of text (-1 on error = failure to retrieve/unserialize/gunzip/etc)
  43          *   \n
  44          *   text  (may be empty)
  45          *
  46          * note that that the text string itself is *not* followed by newline
  47          */
  48         public function execute() {
  49                 $db = wfGetDB( DB_SLAVE );
  50                 $stdin = $this->getStdin();
  51                 while ( !feof( $stdin ) ) {
  52                         $line = fgets( $stdin );
  53                         if ( $line === false ) {
  54                                 // We appear to have lost contact...
  55                                 break;
  56                         }
  57                         $textId = intval( $line );
  58                         $text = $this->doGetText( $db, $textId );
  59                         if ( $text === false ) {
  60                                 # actual error, not zero-length text
  61                                 $textLen = "-1";
  62                         } else {
  63                                 $textLen = strlen( $text );
  64                         }
  65                         $this->output( $textId . "\n" . $textLen . "\n" . $text );
  66                 }
  67         }
  68
  69         /**
  70          * May throw a database error if, say, the server dies during query.
  71          * @param DatabaseBase $db
  72          * @param int $id The old_id
  73          * @return string
  74          */
  75         private function doGetText( $db, $id ) {
  76                 $id = intval( $id );
  77                 $row = $db->selectRow( 'text',
  78                         array( 'old_text', 'old_flags' ),
  79                         array( 'old_id' => $id ),
  80                         __METHOD__ );
  81                 $text = Revision::getRevisionText( $row );
  82                 if ( $text === false ) {
  83                         return false;
  84                 }
  85
  86                 return $text;
  87         }
  88 }
  89
  90 $maintClass = "FetchText";
  91 require_once RUN_MAINTENANCE_IF_MAIN;