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   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;