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<?php
namespace Drupal\big_pipe\Render;
use Drupal\Core\Asset\AssetCollectionRendererInterface;
use Drupal\Core\Asset\AssetResolverInterface;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Form\EnforcedResponseException;
use Drupal\Core\Render\AttachmentsInterface;
use Drupal\Core\Render\AttachmentsResponseProcessorInterface;
use Drupal\Core\Render\HtmlResponseAttachmentsProcessor;
use Drupal\Core\Render\RendererInterface;
use Symfony\Component\HttpFoundation\RequestStack;
/**
* Processes attachments of HTML responses with BigPipe enabled.
*
* @see \Drupal\Core\Render\HtmlResponseAttachmentsProcessor
Alex Pott
committed
* @see \Drupal\big_pipe\Render\BigPipe
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*/
class BigPipeResponseAttachmentsProcessor extends HtmlResponseAttachmentsProcessor {
/**
* The HTML response attachments processor service.
*
* @var \Drupal\Core\Render\AttachmentsResponseProcessorInterface
*/
protected $htmlResponseAttachmentsProcessor;
/**
* Constructs a BigPipeResponseAttachmentsProcessor object.
*
* @param \Drupal\Core\Render\AttachmentsResponseProcessorInterface $html_response_attachments_processor
* The HTML response attachments processor service.
* @param \Drupal\Core\Asset\AssetResolverInterface $asset_resolver
* An asset resolver.
* @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
* A config factory for retrieving required config objects.
* @param \Drupal\Core\Asset\AssetCollectionRendererInterface $css_collection_renderer
* The CSS asset collection renderer.
* @param \Drupal\Core\Asset\AssetCollectionRendererInterface $js_collection_renderer
* The JS asset collection renderer.
* @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
* The request stack.
* @param \Drupal\Core\Render\RendererInterface $renderer
* The renderer.
* @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
* The module handler service.
*/
public function __construct(AttachmentsResponseProcessorInterface $html_response_attachments_processor, AssetResolverInterface $asset_resolver, ConfigFactoryInterface $config_factory, AssetCollectionRendererInterface $css_collection_renderer, AssetCollectionRendererInterface $js_collection_renderer, RequestStack $request_stack, RendererInterface $renderer, ModuleHandlerInterface $module_handler) {
$this->htmlResponseAttachmentsProcessor = $html_response_attachments_processor;
parent::__construct($asset_resolver, $config_factory, $css_collection_renderer, $js_collection_renderer, $request_stack, $renderer, $module_handler);
}
/**
* {@inheritdoc}
*/
public function processAttachments(AttachmentsInterface $response) {
assert('$response instanceof \Drupal\Core\Render\HtmlResponse');
// First, render the actual placeholders; this will cause the BigPipe
// placeholder strategy to generate BigPipe placeholders. We need those to
// exist already so that we can extract BigPipe placeholders. This is hence
// a bit of unfortunate but necessary duplication.
// @see \Drupal\big_pipe\Render\Placeholder\BigPipeStrategy
// (Note this is copied verbatim from
// \Drupal\Core\Render\HtmlResponseAttachmentsProcessor::processAttachments)
try {
$response = $this->renderPlaceholders($response);
}
catch (EnforcedResponseException $e) {
return $e->getResponse();
}
// Extract BigPipe placeholders; HtmlResponseAttachmentsProcessor does not
// know (nor need to know) how to process those.
$attachments = $response->getAttachments();
$big_pipe_placeholders = [];
$big_pipe_nojs_placeholders = [];
if (isset($attachments['big_pipe_placeholders'])) {
$big_pipe_placeholders = $attachments['big_pipe_placeholders'];
unset($attachments['big_pipe_placeholders']);
}
if (isset($attachments['big_pipe_nojs_placeholders'])) {
$big_pipe_nojs_placeholders = $attachments['big_pipe_nojs_placeholders'];
unset($attachments['big_pipe_nojs_placeholders']);
}
$html_response = clone $response;
$html_response->setAttachments($attachments);
// Call HtmlResponseAttachmentsProcessor to process all other attachments.
$processed_html_response = $this->htmlResponseAttachmentsProcessor->processAttachments($html_response);
// Restore BigPipe placeholders.
$attachments = $processed_html_response->getAttachments();
$big_pipe_response = clone $processed_html_response;
if (count($big_pipe_placeholders)) {
$attachments['big_pipe_placeholders'] = $big_pipe_placeholders;
}
if (count($big_pipe_nojs_placeholders)) {
$attachments['big_pipe_nojs_placeholders'] = $big_pipe_nojs_placeholders;
}
$big_pipe_response->setAttachments($attachments);
return $big_pipe_response;
}
}