class MonkeysInTheControlRoom

class MonkeysInTheControlRoom implements HttpKernelInterface {
    
    /**
     * The app kernel.
     *
     * @var \Symfony\Component\HttpKernel\HttpKernelInterface
     */
    protected $app;
    
    /**
     * The settings.
     */
    protected $settings;
    
    /**
     * MonkeysInTheControlRoom constructor.
     *
     * @param \Symfony\Component\HttpKernel\HttpKernelInterface $app
     *   The wrapper HTTP kernel.
     * @param \Drupal\Core\Site\Settings $settings
     *   The settings object.
     */
    public function __construct(HttpKernelInterface $app, Settings $settings) {
        $this->app = $app;
        $this->settings = $settings;
    }
    
    /**
     * {@inheritdoc}
     */
    public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = TRUE) : Response {
        if (\Drupal::state()->get('error_service_test.break_bare_html_renderer')) {
            // Let the bedlam begin.
            // 1) Force a container rebuild.
            
            /** @var \Drupal\Core\DrupalKernelInterface $kernel */
            $kernel = \Drupal::service('kernel');
            $kernel->rebuildContainer();
            // 2) Fetch the in-situ container builder.
            $container = ErrorServiceTestServiceProvider::$containerBuilder;
            // Ensure the compiler pass worked.
            if (!$container) {
                throw new \Exception('Oh oh, monkeys stole the ServiceProvider.');
            }
            // Stop the theme manager from being found - and triggering error
            // maintenance mode.
            $container->removeDefinition('theme.manager');
            // Mash. Mash. Mash.
            \Drupal::setContainer($container);
            throw new \Exception('Oh oh, bananas in the instruments.');
        }
        if (\Drupal::state()->get('error_service_test.break_logger')) {
            throw new \Exception('Deforestation');
        }
        if ($this->settings
            ->get('teapots', FALSE) && class_exists('\\TypeError')) {
            try {
                $return = $this->app
                    ->handle($request, $type, $catch);
            } catch (\TypeError $e) {
                header('HTTP/1.1 418 I\'m a teapot');
                print 'Oh oh, flying teapots';
                exit;
            }
        }
        else {
            $return = $this->app
                ->handle($request, $type, $catch);
        }
        return $return;
    }

}