function TwigEnvironmentTest::testTwigFilePrefixChange

Test twig file prefix change.

File

core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php, line 237

Class

TwigEnvironmentTest

Tests the twig environment.

Namespace

Code

public function testTwigFilePrefixChange() : void {
    
    /** @var \Drupal\Core\Template\TwigEnvironment $environment */
    $environment = \Drupal::service('twig');
    $cache_prefixes = [];
    $cache_filenames = [];
    // Assume this is the service container of webserver A.
    $container_a = $this->container;
    $template_name = 'core/modules/system/templates/container.html.twig';
    // Request 1 handled by webserver A.
    $cache_prefixes[] = \Drupal::state()->get(TwigEnvironment::CACHE_PREFIX_METADATA_KEY)['twig_cache_prefix'];
    $cache_filenames[] = $environment->getCache()
        ->generateKey($template_name, $environment->getTemplateClass($template_name));
    // Assume this is the service container of webserver B.
    // Assume that the files on the webserver B have a different mtime than
    // webserver A.
    touch('core/lib/Drupal/Core/Template/TwigExtension.php');
    clearstatcache(TRUE, 'core/lib/Drupal/Core/Template/TwigExtension.php');
    $container_b = \Drupal::service('kernel')->rebuildContainer();
    // Request 2 handled by webserver B.
    \Drupal::setContainer($container_b);
    $environment = \Drupal::service('twig');
    $cache_prefixes[] = \Drupal::state()->get(TwigEnvironment::CACHE_PREFIX_METADATA_KEY)['twig_cache_prefix'];
    $cache_filenames[] = $environment->getCache()
        ->generateKey($template_name, $environment->getTemplateClass($template_name));
    // Request 3 handled by webserver A.
    \Drupal::setContainer($container_a);
    $container = \Drupal::getContainer();
    // Emulate twig service reconstruct on new request.
    $container->set('twig', NULL);
    $environment = $container->get('twig');
    $cache_prefixes[] = \Drupal::state()->get(TwigEnvironment::CACHE_PREFIX_METADATA_KEY)['twig_cache_prefix'];
    $cache_filenames[] = $environment->getCache()
        ->generateKey($template_name, $environment->getTemplateClass($template_name));
    // Request 4 handled by webserver B.
    \Drupal::setContainer($container_b);
    $container = \Drupal::getContainer();
    // Emulate twig service reconstruct on new request.
    $container->set('twig', NULL);
    $environment = $container->get('twig');
    $cache_prefixes[] = \Drupal::state()->get(TwigEnvironment::CACHE_PREFIX_METADATA_KEY)['twig_cache_prefix'];
    $cache_filenames[] = $environment->getCache()
        ->generateKey($template_name, $environment->getTemplateClass($template_name));
    // The cache prefix should not have been changed, as this is stored in
    // state and thus shared between all (web)servers.
    $this->assertEquals(count(array_unique($cache_prefixes)), 1);
    // This also applies to twig's file cache resulting in an unlimited growth
    // of the cache storage directory.
    $this->assertEquals(count(array_unique($cache_filenames)), 1);
}