rebuildLocalisationCache.php

Go to the documentation of this file.

<?php
 
use MediaWiki\Config\ServiceOptions;
use MediaWiki\Languages\LanguageNameUtils;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MainConfigNames;
use MediaWiki\Maintenance\Maintenance;
use MediaWiki\ResourceLoader\MessageBlobStore;
use MediaWiki\Settings\SettingsBuilder;
 
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
 
class RebuildLocalisationCache extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Rebuild the localisation cache' );
        $this->addOption( 'dry-run', 'Determine what languages need to be rebuilt without changing anything' );
        $this->addOption( 'force', 'Rebuild all files, even ones not out of date' );
        $this->addOption( 'threads', 'Fork more than one thread', false, true );
        $this->addOption( 'outdir', 'Override the output directory (normally $wgCacheDirectory)',
            false, true );
        $this->addOption( 'lang', 'Only rebuild these languages, comma separated.',
            false, true );
        $this->addOption(
            'store-class',
            'Override the LC store class (normally $wgLocalisationCacheConf[\'storeClass\'])',
            false,
            true
        );
        $this->addOption(
            'no-database',
            'EXPERIMENTAL: Disable the database backend. Setting this option will result in an error ' .
            'if you have extensions or use site configuration that need the database. This is an ' .
            'experimental feature to allow offline building of the localisation cache. Known limitations:' .
            "\n" .
            '* Incompatible with LCStoreDB, which always requires a database. ' . "\n" .
            '* The message purge may require a database. See --skip-message-purge.'
        );
        // T237148: The Gadget extension (bundled with MediaWiki by default) requires a database`
        // connection to register its modules for MessageBlobStore.
        $this->addOption(
            'skip-message-purge',
            'Skip purging of MessageBlobStore. The purge operation may require a database, depending ' .
            'on the configuration and extensions on this wiki. If skipping the purge now, you need to ' .
            'run purgeMessageBlobStore.php shortly after deployment.'
        );
        $this->addOption(
            'no-progress',
            "Don't print a message for each rebuilt language file.  Use this instead of " .
            "--quiet to get a brief summary of the operation."
        );
    }
 
    public function finalSetup( SettingsBuilder $settingsBuilder ) {
        # This script needs to be run to build the initial l10n cache. But if
        # LanguageCode is not 'en', it won't be able to run because there is
        # no l10n cache. Break the cycle by forcing the LanguageCode setting to 'en'.
        $settingsBuilder->putConfigValue( MainConfigNames::LanguageCode, 'en' );
        parent::finalSetup( $settingsBuilder );
    }
 
    public function execute() {
        $force = $this->hasOption( 'force' );
        $threads = $this->getOption( 'threads', 1 );
        if ( $threads < 1 || $threads != intval( $threads ) ) {
            $this->output( "Invalid thread count specified; running single-threaded.\n" );
            $threads = 1;
        }
        if ( $threads > 1 && wfIsWindows() ) {
            $this->output( "Threaded rebuild is not supported on Windows; running single-threaded.\n" );
            $threads = 1;
        }
        if ( $threads > 1 && ( !extension_loaded( 'sockets' ) || !function_exists( 'pcntl_fork' ) ) ) {
            $this->output( "Threaded rebuild requires ext-pcntl and ext-sockets; running single-threaded.\n" );
            $threads = 1;
        }
 
        $conf = $this->getConfig()->get( MainConfigNames::LocalisationCacheConf );
        // Allow fallbacks to create CDB files
        $conf['manualRecache'] = false;
        $conf['forceRecache'] = $force || !empty( $conf['forceRecache'] );
        if ( $this->hasOption( 'outdir' ) ) {
            $conf['storeDirectory'] = $this->getOption( 'outdir' );
        }
 
        if ( $this->hasOption( 'store-class' ) ) {
            $conf['storeClass'] = $this->getOption( 'store-class' );
        }
 
        // XXX Copy-pasted from ServiceWiring.php. Do we need a factory for this one caller?
        $services = $this->getServiceContainer();
        $lc = new LocalisationCacheBulkLoad(
            new ServiceOptions(
                LocalisationCache::CONSTRUCTOR_OPTIONS,
                $conf,
                $services->getMainConfig()
            ),
            LocalisationCache::getStoreFromConf( $conf, $this->getConfig()->get( MainConfigNames::CacheDirectory ) ),
            LoggerFactory::getInstance( 'localisation' ),
            $this->hasOption( 'skip-message-purge' ) ? [] :
                [ static function () use ( $services ) {
                    MessageBlobStore::clearGlobalCacheEntry( $services->getMainWANObjectCache() );
                } ],
            $services->getLanguageNameUtils(),
            $services->getHookContainer()
        );
 
        $allCodes = array_keys( $services
            ->getLanguageNameUtils()
            ->getLanguageNames( LanguageNameUtils::AUTONYMS, LanguageNameUtils::SUPPORTED ) );
        if ( $this->hasOption( 'lang' ) ) {
            # Validate requested languages
            $codes = array_intersect( $allCodes,
                explode( ',', $this->getOption( 'lang' ) ) );
            # Bailed out if nothing is left
            if ( count( $codes ) == 0 ) {
                $this->fatalError( 'None of the languages specified exists.' );
            }
        } else {
            # By default get all languages
            $codes = $allCodes;
        }
        sort( $codes );
 
        $numRebuilt = 0;
        $total = count( $codes );
        $parentStatus = 0;
 
        if ( $threads <= 1 ) {
            // Single-threaded implementation
            $numRebuilt += $this->doRebuild( $codes, $lc, $force );
        } else {
            // Multi-threaded implementation
            $chunks = array_chunk( $codes, ceil( count( $codes ) / $threads ) );
            // Map from PID to readable socket
            $sockets = [];
 
            foreach ( $chunks as $codes ) {
                $socketpair = [];
                // Create a pair of sockets so that the child can communicate
                // the number of rebuilt langs to the parent.
                if ( !socket_create_pair( AF_UNIX, SOCK_STREAM, 0, $socketpair ) ) {
                    $this->fatalError( 'socket_create_pair failed' );
                }
 
                $pid = pcntl_fork();
 
                if ( $pid === -1 ) {
                    $this->fatalError( ' pcntl_fork failed' );
                } elseif ( $pid === 0 ) {
                    // Child, reseed because there is no bug in PHP:
                    // https://bugs.php.net/bug.php?id=42465
                    mt_srand( getmypid() );
 
                    $numRebuilt = $this->doRebuild( $codes, $lc, $force );
                    // Report the number of rebuilt langs to the parent.
                    $msg = "$numRebuilt\n";
                    socket_write( $socketpair[1], $msg, strlen( $msg ) );
                    // Child exits.
                    return;
                } else {
                    // Main thread
                    $sockets[$pid] = $socketpair[0];
                }
            }
 
            // Wait for all children
            foreach ( $sockets as $pid => $socket ) {
                $status = 0;
                pcntl_waitpid( $pid, $status );
 
                if ( pcntl_wifexited( $status ) ) {
                    $code = pcntl_wexitstatus( $status );
                    if ( $code ) {
                        $this->output( "Pid $pid exited with status $code !!\n" );
                    } else {
                        // Good exit status from child.  Read the number of rebuilt langs from it.
                        $res = socket_read( $socket, 512, PHP_NORMAL_READ );
                        if ( $res === false ) {
                            $this->output( "socket_read failed in parent\n" );
                        } else {
                            $numRebuilt += intval( $res );
                        }
                    }
 
                    // Mush all child statuses into a single value in the parent.
                    $parentStatus |= $code;
                } elseif ( pcntl_wifsignaled( $status ) ) {
                    $signum = pcntl_wtermsig( $status );
                    $this->output( "Pid $pid terminated by signal $signum !!\n" );
                    $parentStatus |= 1;
                }
            }
        }
 
        $this->output( "$numRebuilt languages rebuilt out of $total\n" );
        if ( $numRebuilt === 0 ) {
            $this->output( "Use --force to rebuild the caches which are still fresh.\n" );
        }
        if ( $parentStatus ) {
            $this->fatalError( 'Failed.', $parentStatus );
        }
    }
 
    private function doRebuild( $codes, $lc, $force ) {
        $numRebuilt = 0;
        $operation = $this->hasOption( 'dry-run' ) ? "Would rebuild" : "Rebuilding";
 
        foreach ( $codes as $code ) {
            if ( $force || $lc->isExpired( $code ) ) {
                if ( !$this->hasOption( 'no-progress' ) ) {
                    $this->output( "$operation $code...\n" );
                }
                if ( !$this->hasOption( 'dry-run' ) ) {
                    $lc->recache( $code );
                }
                $numRebuilt++;
            }
        }
 
        return $numRebuilt;
    }
 
    public function getDbType() {
        if ( $this->hasOption( 'no-database' ) ) {
            return Maintenance::DB_NONE;
        }
 
        return parent::getDbType();
    }
 
    public function setForce( $forced = true ) {
        $this->setOption( 'force', $forced );
    }
}
 
// @codeCoverageIgnoreStart
$maintClass = RebuildLocalisationCache::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd