maintenance/fixDoubleRedirects.php

   1 <?php
   2 /**
   3  * Fix double redirects.
   4  *
   5  * Copyright © 2011 Ilmari Karonen <nospam@vyznev.net>
   6  * http://www.mediawiki.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @author Ilmari Karonen <nospam@vyznev.net>
  25  * @ingroup Maintenance
  26  */
  27
  28 require_once( dirname( __FILE__ ) . '/Maintenance.php' );
  29
  30 /**
  31  * Maintenance script that fixes double redirects.
  32  *
  33  * @ingroup Maintenance
  34  */
  35 class FixDoubleRedirects extends Maintenance {
  36         public function __construct() {
  37                 parent::__construct();
  38                 $this->mDescription = "Script to fix double redirects";
  39                 $this->addOption( 'async', 'Don\'t fix anything directly, just queue the jobs' );
  40                 $this->addOption( 'title', 'Fix only redirects pointing to this page', false, true );
  41                 $this->addOption( 'dry-run', 'Perform a dry run, fix nothing' );
  42         }
  43
  44         public function execute() {
  45                 $async = $this->getOption( 'async', false );
  46                 $dryrun = $this->getOption( 'dry-run', false );
  47                 $title = $this->getOption( 'title' );
  48
  49                 if ( isset( $title ) ) {
  50                         $title = Title::newFromText( $title );
  51                         if ( !$title || !$title->isRedirect() ) {
  52                                 $this->error( $title->getPrefixedText() . " is not a redirect!\n", true );
  53                         }
  54                 }
  55
  56                 $dbr = wfGetDB( DB_SLAVE );
  57
  58                 $tables = array( 'redirect', 'pa' => 'page', 'pb' => 'page' );
  59                 $fields = array(
  60                         'pa.page_namespace AS pa_namespace',
  61                         'pa.page_title AS pa_title',
  62                         'pb.page_namespace AS pb_namespace',
  63                         'pb.page_title AS pb_title',
  64                 );
  65                 $conds = array(
  66                         'rd_from = pa.page_id',
  67                         'rd_namespace = pb.page_namespace',
  68                         'rd_title = pb.page_title',
  69                         'pb.page_is_redirect' => 1,
  70                 );
  71
  72                 if ( isset( $title ) ) {
  73                         $conds['pb.page_namespace'] = $title->getNamespace();
  74                         $conds['pb.page_title'] = $title->getDBkey();
  75                 }
  76                 // TODO: support batch querying
  77
  78                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__ );
  79
  80                 if ( !$res->numRows() ) {
  81                         $this->output( "No double redirects found.\n" );
  82                         return;
  83                 }
  84
  85                 $jobs = array();
  86                 $n = 0;
  87                 foreach ( $res as $row ) {
  88                         $titleA = Title::makeTitle( $row->pa_namespace, $row->pa_title );
  89                         $titleB = Title::makeTitle( $row->pb_namespace, $row->pb_title );
  90
  91                         $job = new DoubleRedirectJob( $titleA, array( 'reason' => 'maintenance', 'redirTitle' => $titleB->getPrefixedDBkey() ) );
  92
  93                         if ( !$async ) {
  94                                 $success = ( $dryrun ? true : $job->run() );
  95                                 if ( !$success ) {
  96                                         $this->error( "Error fixing " . $titleA->getPrefixedText() . ": " . $job->getLastError() . "\n" );
  97                                 }
  98                         } else {
  99                                 $jobs[] = $job;
 100                                 // @todo FIXME: Hardcoded constant 10000 copied from DoubleRedirectJob class
 101                                 if ( count( $jobs ) > 10000 ) {
 102                                         $this->queueJobs( $jobs, $dryrun );
 103                                         $jobs = array();
 104                                 }
 105                         }
 106
 107                         if ( ++$n % 100 == 0 ) {
 108                                 $this->output( "$n...\n" );
 109                         }
 110                 }
 111
 112                 if ( count( $jobs ) ) {
 113                         $this->queueJobs( $jobs, $dryrun );
 114                 }
 115                 $this->output( "$n double redirects processed.\n" );
 116         }
 117
 118         protected function queueJobs( $jobs, $dryrun = false ) {
 119                 $this->output( "Queuing batch of " . count( $jobs ) . " double redirects.\n" );
 120                 Job::batchInsert( $dryrun ? array() : $jobs );
 121         }
 122 }
 123
 124 $maintClass = "FixDoubleRedirects";
 125 require_once( RUN_MAINTENANCE_IF_MAIN );