class EntityDebugController

class EntityDebugController extends ControllerBase {
    
    /**
     * The dumper service.
     *
     * @var \Drupal\devel\DevelDumperManagerInterface
     */
    protected $dumper;
    
    /**
     * EntityDebugController constructor.
     *
     * @param \Drupal\devel\DevelDumperManagerInterface $dumper
     *   The dumper service.
     */
    public function __construct(DevelDumperManagerInterface $dumper) {
        $this->dumper = $dumper;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('devel.dumper'));
    }
    
    /**
     * Returns the entity type definition of the current entity.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function entityTypeDefinition(RouteMatchInterface $route_match) {
        $output = [];
        $entity = $this->getEntityFromRouteMatch($route_match);
        if ($entity instanceof EntityInterface) {
            $output = $this->dumper
                ->exportAsRenderable($entity->getEntityType());
        }
        return $output;
    }
    
    /**
     * Returns the loaded structure of the current entity.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function entityLoad(RouteMatchInterface $route_match) {
        $output = [];
        $entity = $this->getEntityFromRouteMatch($route_match);
        if ($entity instanceof EntityInterface) {
            // Field definitions are lazy loaded and are populated only when needed.
            // By calling ::getFieldDefinitions() we are sure that field definitions
            // are populated and available in the dump output.
            // @see https://www.drupal.org/node/2311557
            if ($entity instanceof FieldableEntityInterface) {
                $entity->getFieldDefinitions();
            }
            $output = $this->dumper
                ->exportAsRenderable($entity);
        }
        return $output;
    }
    
    /**
     * Returns the render structure of the current entity.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   A RouteMatch object.
     *
     * @return array
     *   Array of page elements to render.
     */
    public function entityRender(RouteMatchInterface $route_match) {
        $output = [];
        $entity = $this->getEntityFromRouteMatch($route_match);
        if ($entity instanceof EntityInterface) {
            $entity_type_id = $entity->getEntityTypeId();
            $view_hook = $entity_type_id . '_view';
            $build = [];
            // If module implements own {entity_type}_view() hook use it, otherwise
            // fallback to the entity view builder if available.
            if (function_exists($view_hook)) {
                $build = $view_hook($entity);
            }
            elseif ($this->entityTypeManager()
                ->hasHandler($entity_type_id, 'view_builder')) {
                $build = $this->entityTypeManager()
                    ->getViewBuilder($entity_type_id)
                    ->view($entity);
            }
            $output = $this->dumper
                ->exportAsRenderable($build);
        }
        return $output;
    }
    
    /**
     * Retrieves entity from route match.
     *
     * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
     *   The route match.
     *
     * @return \Drupal\Core\Entity\EntityInterface|null
     *   The entity object as determined from the passed-in route match.
     */
    protected function getEntityFromRouteMatch(RouteMatchInterface $route_match) {
        $parameter_name = $route_match->getRouteObject()
            ->getOption('_devel_entity_type_id');
        return $route_match->getParameter($parameter_name);
    }

}