maintenance/fetchText.php

   1 <?php
   2 /**
   3  * Communications protocol...
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @ingroup Maintenance
  21  */
  22
  23 require_once( dirname( __FILE__ ) . '/Maintenance.php' );
  24
  25 class FetchText extends Maintenance {
  26         public function __construct() {
  27                 parent::__construct();
  28                 $this->mDescription = "Fetch the revision text from an old_id";
  29         }
  30
  31         /*
  32          * returns a string containing the following in order:
  33          *       textid
  34          *       \n
  35          *       length of text (-1 on error = failure to retrieve/unserialize/gunzip/etc)
  36          *       \n
  37          *       text  (may be empty)
  38          *
  39          * note that that the text string itself is *not* followed by newline
  40          */
  41          public function execute() {
  42                 $db = wfGetDB( DB_SLAVE );
  43                 $stdin = $this->getStdin();
  44                 while ( !feof( $stdin ) ) {
  45                         $line = fgets( $stdin );
  46                         if ( $line === false ) {
  47                                 // We appear to have lost contact...
  48                                 break;
  49                         }
  50                         $textId = intval( $line );
  51                         $text = $this->doGetText( $db, $textId );
  52                         if ($text === false) {
  53                                 # actual error, not zero-length text
  54                                 $textLen = "-1";
  55                         }
  56                         else {
  57                                 $textLen = strlen($text);
  58                         }
  59                         $this->output( $textId . "\n" . $textLen . "\n" . $text );
  60                 }
  61         }
  62
  63         /**
  64          * May throw a database error if, say, the server dies during query.
  65          * @param $db Database object
  66          * @param $id int The old_id
  67          * @return String
  68          */
  69         private function doGetText( $db, $id ) {
  70                 $id = intval( $id );
  71                 $row = $db->selectRow( 'text',
  72                         array( 'old_text', 'old_flags' ),
  73                         array( 'old_id' => $id ),
  74                         'TextPassDumper::getText' );
  75                 $text = Revision::getRevisionText( $row );
  76                 if ( $text === false ) {
  77                         return false;
  78                 }
  79                 return $text;
  80         }
  81 }
  82
  83 $maintClass = "FetchText";
  84 require_once( DO_MAINTENANCE );