Help needed finishing Twig extension to render ESI - Symfony2

[johnsmith153]

I want to create a Twig extension and use this:

    {{ new_func(route-name) }}

To do the same thing as:

    {{ render_esi(url(route-name)) }}

...but with some adjustments (relating to caching, but that's not important).

 

It's nearly done but it's this line that needs to be changed, but I can't see how I can call an ESI from this code (outside of Twig):

    return $environment->render($route);   /// needs to receive route and render an ESI

         

The code:

    namespace Acme\Bundle\MyBundle\Twig;

 

    class NewTwigFunction extends \Twig_Extension

    {

 

        private $request;

    

        public function __construct($container)

        {

            $this->request = $container->get('request');

        }

 

        public function getFunctions() {

 

            return array('new_func' => new \Twig_Function_Method($this, 'newFunction', array('needs_environment' => true) ));

 

        }

 

        public function newFunction(\Twig_Environment $environment, $route) {

 

            return $environment->render($route);

 

        }

 

        public function getName() {

 

            return "new_func";

 

        }

 

    }