maintenance/rebuildLocalisationCache.php

   1 <?php
   2
   3 /**
   4  * Rebuild the localisation cache. Useful if you disabled automatic updates
   5  * using $wgLocalisationCacheConf['manualRecache'] = true;
   6  *
   7  * Usage:
   8  *    php rebuildLocalisationCache.php [--force] [--threads=N]
   9  *
  10  * Use --force to rebuild all files, even the ones that are not out of date.
  11  * Use --threads=N to fork more threads.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License along
  24  * with this program; if not, write to the Free Software Foundation, Inc.,
  25  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  26  * http://www.gnu.org/copyleft/gpl.html
  27  *
  28  * @ingroup Maintenance
  29  */
  30
  31 require_once( dirname( __FILE__ ) . '/Maintenance.php' );
  32
  33 class RebuildLocalisationCache extends Maintenance {
  34         public function __construct() {
  35                 parent::__construct();
  36                 $this->mDescription = "Rebuild the localisation cache";
  37                 $this->addOption( 'force', 'Rebuild all files, even ones not out of date' );
  38                 $this->addOption( 'threads', 'Fork more than one thread', false, true );
  39                 $this->addOption( 'outdir', 'Override the output directory (normally $wgCacheDirectory)',
  40                         false, true );
  41         }
  42
  43         public function memoryLimit() {
  44                 return '1000M';
  45         }
  46
  47         public function execute() {
  48                 global $wgLocalisationCacheConf;
  49
  50                 $force = $this->hasOption( 'force' );
  51                 $threads = $this->getOption( 'threads', 1 );
  52                 if ( $threads < 1 || $threads != intval( $threads ) ) {
  53                         $this->output( "Invalid thread count specified; running single-threaded.\n" );
  54                         $threads = 1;
  55                 }
  56                 if ( $threads > 1 && wfIsWindows() ) {
  57                         $this->output( "Threaded rebuild is not supported on Windows; running single-threaded.\n" );
  58                         $threads = 1;
  59                 }
  60                 if ( $threads > 1 && !function_exists( 'pcntl_fork' ) ) {
  61                         $this->output( "PHP pcntl extension is not present; running single-threaded.\n" );
  62                         $threads = 1;
  63                 }
  64
  65                 $conf = $wgLocalisationCacheConf;
  66                 $conf['manualRecache'] = false; // Allow fallbacks to create CDB files
  67                 if ( $force ) {
  68                         $conf['forceRecache'] = true;
  69                 }
  70                 if ( $this->hasOption( 'outdir' ) ) {
  71                         $conf['storeDirectory'] = $this->getOption( 'outdir' );
  72                 }
  73                 $lc = new LocalisationCache_BulkLoad( $conf );
  74
  75                 $codes = array_keys( Language::fetchLanguageNames( null, 'mwfile' ) );
  76                 sort( $codes );
  77
  78                 // Initialise and split into chunks
  79                 $numRebuilt = 0;
  80                 $total = count( $codes );
  81                 $chunks = array_chunk( $codes, ceil( count( $codes ) / $threads ) );
  82                 $pids = array();
  83                 foreach ( $chunks as $codes ) {
  84                         // Do not fork for only one thread
  85                         $pid = ( $threads > 1 ) ? pcntl_fork() : -1;
  86
  87                         if ( $pid === 0 ) {
  88                                 // Child, reseed because there is no bug in PHP:
  89                                 // http://bugs.php.net/bug.php?id=42465
  90                                 mt_srand( getmypid() );
  91                                 $numRebuilt = $this->doRebuild( $codes, $lc, $force );
  92                                 // Abuse the exit value for the count of rebuild languages
  93                                 exit( $numRebuilt );
  94                         } elseif ( $pid === -1 ) {
  95                                 // Fork failed or one thread, do it serialized
  96                                 $numRebuilt += $this->doRebuild( $codes, $lc, $force );
  97                         } else {
  98                                 // Main thread
  99                                 $pids[] = $pid;
 100                         }
 101                 }
 102                 // Wait for all children
 103                 foreach ( $pids as $pid ) {
 104                         $status = 0;
 105                         pcntl_waitpid( $pid, $status );
 106                         // Fetch the count from the return value
 107                         $numRebuilt += pcntl_wexitstatus( $status );
 108                 }
 109
 110                 $this->output( "$numRebuilt languages rebuilt out of $total\n" );
 111                 if ( $numRebuilt === 0 ) {
 112                         $this->output( "Use --force to rebuild the caches which are still fresh.\n" );
 113                 }
 114         }
 115
 116         /**
 117          * Helper function to rebuild list of languages codes. Prints the code
 118          * for each language which is rebuilt.
 119          * @param $codes array List of language codes to rebuild.
 120          * @param $lc LocalisationCache Instance of LocalisationCache_BulkLoad (?)
 121          * @param $force bool Rebuild up-to-date languages
 122          * @return int Number of rebuilt languages
 123          */
 124         private function doRebuild( $codes, $lc, $force ) {
 125                 $numRebuilt = 0;
 126                 foreach ( $codes as $code ) {
 127                         if ( $force || $lc->isExpired( $code ) ) {
 128                                 $this->output( "Rebuilding $code...\n" );
 129                                 $lc->recache( $code );
 130                                 $numRebuilt++;
 131                         }
 132                 }
 133                 return $numRebuilt;
 134         }
 135
 136         /**
 137          * Sets whether a run of this maintenance script has the force parameter set
 138          *
 139          * @param bool $forced
 140          */
 141         public function setForce( $forced = true ) {
 142                 $this->mOptions['force'] = $forced;
 143         }
 144 }
 145
 146 $maintClass = "RebuildLocalisationCache";
 147 require_once( RUN_MAINTENANCE_IF_MAIN );