rebuildFileCache.php

Go to the documentation of this file.

<?php
use MediaWiki\Context\RequestContext;
use MediaWiki\MainConfigNames;
use MediaWiki\Settings\SettingsBuilder;
use MediaWiki\Title\Title;
use Wikimedia\AtEase\AtEase;
use Wikimedia\Rdbms\SelectQueryBuilder;
 
require_once __DIR__ . '/Maintenance.php';
 
class RebuildFileCache extends Maintenance {
    private $enabled = true;
 
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Build the file cache' );
        $this->addOption( 'start', 'Page_id to start from', false, true );
        $this->addOption( 'end', 'Page_id to end on', false, true );
        $this->addOption( 'overwrite', 'Refresh page cache' );
        $this->addOption( 'all', 'Build the file cache for pages in all namespaces, not just content pages' );
        $this->setBatchSize( 100 );
    }
 
    public function finalSetup( SettingsBuilder $settingsBuilder ) {
        $this->enabled = $settingsBuilder->getConfig()->get( MainConfigNames::UseFileCache );
        // Script will handle capturing output and saving it itself
        $settingsBuilder->putConfigValue( MainConfigNames::UseFileCache, false );
 
        // Avoid DB writes (like enotif/counters)
        $this->getServiceContainer()->getReadOnlyMode()
            ->setReason( 'Building cache' );
 
        // Ensure no debug-specific logic ends up in the cache (must be after Setup.php)
        MWDebug::deinit();
 
        parent::finalSetup( $settingsBuilder );
    }
 
    public function execute() {
        if ( !$this->enabled ) {
            $this->fatalError( "Nothing to do -- \$wgUseFileCache is disabled." );
        }
 
        $start = $this->getOption( 'start', "0" );
        if ( !ctype_digit( $start ) ) {
            $this->fatalError( "Invalid value for start parameter." );
        }
        $start = intval( $start );
 
        $end = $this->getOption( 'end', "0" );
        if ( !ctype_digit( $end ) ) {
            $this->fatalError( "Invalid value for end parameter." );
        }
        $end = intval( $end );
 
        $this->output( "Building page file cache from page_id {$start}!\n" );
 
        $dbr = $this->getReplicaDB();
        $batchSize = $this->getBatchSize();
        $overwrite = $this->hasOption( 'overwrite' );
        $start = ( $start > 0 )
            ? $start
            : $dbr->newSelectQueryBuilder()
                ->select( 'MIN(page_id)' )
                ->from( 'page' )
                ->caller( __METHOD__ )->fetchField();
        $end = ( $end > 0 )
            ? $end
            : $dbr->newSelectQueryBuilder()
                ->select( 'MAX(page_id)' )
                ->from( 'page' )
                ->caller( __METHOD__ )->fetchField();
        if ( !$start ) {
            $this->fatalError( "Nothing to do." );
        }
 
        $where = [];
        if ( !$this->getOption( 'all' ) ) {
            // If 'all' isn't passed as an option, just fall back to previous behaviour
            // of using content namespaces
            $where['page_namespace'] =
                $this->getServiceContainer()->getNamespaceInfo()->getContentNamespaces();
        }
 
        // Mock request (hack, no real client)
        $_SERVER['HTTP_ACCEPT_ENCODING'] = 'bgzip';
 
        # Do remaining chunk
        $end += $batchSize - 1;
        $blockStart = $start;
        $blockEnd = $start + $batchSize - 1;
 
        $dbw = $this->getPrimaryDB();
        // Go through each page and save the output
        while ( $blockEnd <= $end ) {
            // Get the pages
            $res = $dbr->newSelectQueryBuilder()
                ->select( [ 'page_namespace', 'page_title', 'page_id' ] )
                ->from( 'page' )
                ->useIndex( 'PRIMARY' )
                ->where( $where )
                ->andWhere( [ "page_id BETWEEN " . (int)$blockStart . " AND " . (int)$blockEnd ] )
                ->orderBy( 'page_id', SelectQueryBuilder::SORT_ASC )
                ->caller( __METHOD__ )->fetchResultSet();
 
            $this->beginTransaction( $dbw, __METHOD__ ); // for any changes
            foreach ( $res as $row ) {
                $rebuilt = false;
 
                $title = Title::makeTitleSafe( $row->page_namespace, $row->page_title );
                if ( $title === null ) {
                    $this->output( "Page {$row->page_id} has bad title\n" );
                    continue; // broken title?
                }
 
                $context = new RequestContext();
                $context->setTitle( $title );
                $article = Article::newFromTitle( $title, $context );
                $context->setWikiPage( $article->getPage() );
 
                // Some extensions like FlaggedRevs while error out if this is unset
                RequestContext::getMain()->setTitle( $title );
 
                // If the article is cacheable, then load it
                if ( $article->isFileCacheable( HTMLFileCache::MODE_REBUILD ) ) {
                    $viewCache = new HTMLFileCache( $title, 'view' );
                    $historyCache = new HTMLFileCache( $title, 'history' );
                    if ( $viewCache->isCacheGood() && $historyCache->isCacheGood() ) {
                        if ( $overwrite ) {
                            $rebuilt = true;
                        } else {
                            $this->output( "Page '$title' (id {$row->page_id}) already cached\n" );
                            continue; // done already!
                        }
                    }
 
                    AtEase::suppressWarnings(); // header notices
 
                    // 1. Cache ?action=view
                    // Be sure to reset the mocked request time (T24852)
                    $_SERVER['REQUEST_TIME_FLOAT'] = microtime( true );
                    ob_start();
                    $article->view();
                    $context->getOutput()->output();
                    $context->getOutput()->clearHTML();
                    $viewHtml = ob_get_clean();
                    $viewCache->saveToFileCache( $viewHtml );
 
                    // 2. Cache ?action=history
                    // Be sure to reset the mocked request time (T24852)
                    $_SERVER['REQUEST_TIME_FLOAT'] = microtime( true );
                    ob_start();
                    Action::factory( 'history', $article, $context )->show();
                    $context->getOutput()->output();
                    $context->getOutput()->clearHTML();
                    $historyHtml = ob_get_clean();
                    $historyCache->saveToFileCache( $historyHtml );
 
                    AtEase::restoreWarnings();
 
                    if ( $rebuilt ) {
                        $this->output( "Re-cached page '$title' (id {$row->page_id})..." );
                    } else {
                        $this->output( "Cached page '$title' (id {$row->page_id})..." );
                    }
                    $this->output( "[view: " . strlen( $viewHtml ) . " bytes; " .
                        "history: " . strlen( $historyHtml ) . " bytes]\n" );
                } else {
                    $this->output( "Page '$title' (id {$row->page_id}) not cacheable\n" );
                }
            }
            $this->commitTransaction( $dbw, __METHOD__ ); // commit any changes
 
            $blockStart += $batchSize;
            $blockEnd += $batchSize;
        }
        $this->output( "Done!\n" );
    }
}
 
$maintClass = RebuildFileCache::class;
require_once RUN_MAINTENANCE_IF_MAIN;