SubrequestExtractionController.php in GraphQL 8.3

Namespace

Drupal\graphql\Controller

File

src/Controller/SubrequestExtractionController.php

<?php

namespace Drupal\graphql\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Language\LanguageManagerInterface;
use Drupal\Core\Render\RenderContext;
use Drupal\Core\Render\RendererInterface;
use Drupal\graphql\GraphQL\Buffers\SubRequestResponse;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Extract arbitrary information from subrequests.
 */
class SubrequestExtractionController extends ControllerBase {

  /**
   * The symfony request stack.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected $requestStack;

  /**
   * The renderer service.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container
      ->get('request_stack'), $container
      ->get('language_manager'), $container
      ->get('renderer'));
  }

  /**
   * SubrequestExtractionController constructor.
   *
   * @param \Symfony\Component\HttpFoundation\RequestStack $requestStack
   *   The request stack.
   * @param \Drupal\Core\Language\LanguageManagerInterface $languageManager
   *   The language manager service.
   * @param \Drupal\Core\Render\RendererInterface $renderer
   *   The rewnderer service.
   */
  public function __construct(RequestStack $requestStack, LanguageManagerInterface $languageManager, RendererInterface $renderer) {
    $this->requestStack = $requestStack;
    $this->languageManager = $languageManager;
    $this->renderer = $renderer;
  }

  /**
   * Extracts the sub-request callback response.
   *
   * @return \Drupal\graphql\GraphQL\Buffers\SubRequestResponse
   *   The sub-request response object.
   */
  public function extract() {
    $request = $this->requestStack
      ->getCurrentRequest();
    $callback = $request->attributes
      ->get('_graphql_subrequest');

    // TODO: Remove this once https://www.drupal.org/project/drupal/issues/2940036#comment-12479912 is resolved.
    $this->languageManager
      ->reset();

    // Collect any potentially leaked cache metadata released by the callback.
    $context = new RenderContext();
    $result = $this->renderer
      ->executeInRenderContext($context, function () use ($callback) {
      return $callback();
    });
    $response = new SubRequestResponse($result);
    if (!$context
      ->isEmpty()) {
      $response
        ->addCacheableDependency($context
        ->pop());
    }
    return $response;
  }

}

Classes

Name	Description
SubrequestExtractionController	Extract arbitrary information from subrequests.