function TwigEnvironmentTest::testTwigFilePrefixChange

Test twig file prefix change.

File

core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php, line 223

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);
}