maintenance/fixDoubleRedirects.php

   1 <?php
   2 /**
   3  * Script to fix double redirects.
   4  *
   5  * Copyright (C) 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 class FixDoubleRedirects extends Maintenance {
  31         public function __construct() {
  32                 parent::__construct();
  33                 $this->mDescription = "Script to fix double redirects";
  34                 $this->addOption( 'async', 'Don\'t fix anything directly, just queue the jobs' );
  35                 $this->addOption( 'title', 'Fix only redirects pointing to this page', false, true );
  36                 $this->addOption( 'dry-run', 'Perform a dry run, fix nothing' );
  37         }
  38
  39         public function execute() {
  40                 $async = $this->getOption( 'async', false );
  41                 $dryrun = $this->getOption( 'dry-run', false );
  42                 $title = $this->getOption( 'title' );
  43
  44                 if ( isset( $title ) ) {
  45                         $title = Title::newFromText( $title );
  46                         if ( !$title || !$title->isRedirect() ) {
  47                                 $this->error( $title->getPrefixedText() . " is not a redirect!\n", true );
  48                         }
  49                 }
  50
  51                 $dbr = wfGetDB( DB_SLAVE );
  52
  53                 $tables = array( 'redirect', 'pa' => 'page', 'pb' => 'page' );
  54                 $fields = array(
  55                         'pa.page_namespace AS pa_namespace',
  56                         'pa.page_title AS pa_title',
  57                         'pb.page_namespace AS pb_namespace',
  58                         'pb.page_title AS pb_title',
  59                 );
  60                 $conds = array(
  61                         'rd_from = pa.page_id',
  62                         'rd_namespace = pb.page_namespace',
  63                         'rd_title = pb.page_title',
  64                         'pb.page_is_redirect' => 1,
  65                 );
  66
  67                 if ( isset( $title ) ) {
  68                         $conds['pb.page_namespace'] = $title->getNamespace();
  69                         $conds['pb.page_title'] = $title->getDBkey();
  70                 }
  71                 // TODO: support batch querying
  72
  73                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__ );
  74
  75                 if ( !$res->numRows() ) {
  76                         $this->output( "No double redirects found.\n" );
  77                         return;
  78                 }
  79
  80                 $jobs = array();
  81                 $n = 0;
  82                 foreach ( $res as $row ) {
  83                         $titleA = Title::makeTitle( $row->pa_namespace, $row->pa_title );
  84                         $titleB = Title::makeTitle( $row->pb_namespace, $row->pb_title );
  85
  86                         $job = new DoubleRedirectJob( $titleA, array( 'reason' => 'maintenance', 'redirTitle' => $titleB->getPrefixedDBkey() ) );
  87
  88                         if ( !$async ) {
  89                                 $success = ( $dryrun ? true : $job->run() );
  90                                 if ( !$success ) {
  91                                         $this->error( "Error fixing " . $titleA->getPrefixedText() . ": " . $job->getLastError() . "\n" );
  92                                 }
  93                         } else {
  94                                 $jobs[] = $job;
  95                                 // @todo FIXME: Hardcoded constant 10000 copied from DoubleRedirectJob class
  96                                 if ( count( $jobs ) > 10000 ) {
  97                                         $this->queueJobs( $jobs, $dryrun );
  98                                         $jobs = array();
  99                                 }
 100                         }
 101
 102                         if ( ++$n % 100 == 0 ) {
 103                                 $this->output( "$n...\n" );
 104                         }
 105                 }
 106
 107                 if ( count( $jobs ) ) {
 108                         $this->queueJobs( $jobs, $dryrun );
 109                 }
 110                 $this->output( "$n double redirects processed.\n" );
 111         }
 112
 113         protected function queueJobs( $jobs, $dryrun = false ) {
 114                 $this->output( "Queuing batch of " . count( $jobs ) . " double redirects.\n" );
 115                 Job::batchInsert( $dryrun ? array() : $jobs );
 116         }
 117 }
 118
 119 $maintClass = "FixDoubleRedirects";
 120 require_once( RUN_MAINTENANCE_IF_MAIN );