function BigPipe::sendContent

Sends an HTML response in chunks using the BigPipe technique.

@internal This method should only be invoked by \Drupal\big_pipe\Render\BigPipeResponse, which is itself an internal class.

Parameters

\Drupal\big_pipe\Render\BigPipeResponse $response: The BigPipe response to send.

File

core/modules/big_pipe/src/Render/BigPipe.php, line 225

Class

BigPipe

Service for sending an HTML response in chunks (to get faster page loads).

Namespace

Code

public function sendContent(BigPipeResponse $response) {
    $content = $response->getContent();
    $attachments = $response->getAttachments();
    // First, gather the BigPipe placeholders that must be replaced.
    $placeholders = $attachments['big_pipe_placeholders'] ?? [];
    $nojs_placeholders = $attachments['big_pipe_nojs_placeholders'] ?? [];
    // BigPipe sends responses using "Transfer-Encoding: chunked". To avoid
    // sending already-sent assets, it is necessary to track cumulative assets
    // from all previously rendered/sent chunks.
    // @see https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.41
    $cumulative_assets = AttachedAssets::createFromRenderArray([
        '#attached' => $attachments,
    ]);
    $cumulative_assets->setAlreadyLoadedLibraries($attachments['library']);
    // Find the closing </body> tag and get the strings before and after. But be
    // careful to use the latest occurrence of the string "</body>", to ensure
    // that strings in inline JavaScript or CDATA sections aren't used instead.
    $parts = explode('</body>', $content);
    $post_body = array_pop($parts);
    $pre_body = implode('', $parts);
    $this->sendPreBody($pre_body, $nojs_placeholders, $cumulative_assets);
    $this->sendPlaceholders($placeholders, $this->getPlaceholderOrder($pre_body, $placeholders), $cumulative_assets);
    $this->sendPostBody($post_body);
    $this->performPostSendTasks();
}