Zend2: how to render view wrapped in layout into a variable? - zend-framework2

Question

I need to save all rendered content (layout + view) in a variable to save it with Zend_Cache, I can't use Varnish, nginx or other software to do so. Currently I'm doing it like that:
$view->setTemplate('application/index/index');
$viewContent = $renderer->render($view);
$view = $this->getEvent()->getViewModel();
$view->content = $viewContent;
$content = $renderer->render($view);
Can anyone suggest me more elegant solution? Mb catching native render event with EventManager or some tricks with Response object or dispatch event? Would like to hear all suggestions.
Thanks!

Answer 1

Add two listeners to your Module class. one listener checks early, just after route if the match is one that's cached. The second listener waits for render and grabs the output to store it in cache:
namespace MyModule;
use Zend\Mvc\MvcEvent;
class Module
{
public function onBootstrap(MvcEvent $e)
{
// A list of routes to be cached
$routes = array('foo/bar', 'foo/baz');
$app = $e->getApplication();
$em = $app->getEventManager();
$sm = $app->getServiceManager();
$em->attach(MvcEvent::EVENT_ROUTE, function($e) use ($sm) {
$route = $e->getRouteMatch()->getMatchedRouteName();
$cache = $sm->get('cache-service');
$key = 'route-cache-' . $route;
if ($cache->hasItem($key)) {
// Handle response
$content = $cache->getItem($key);
$response = $e->getResponse();
$response->setContent($content);
return $response;
}
}, -1000); // Low, then routing has happened
$em->attach(MvcEvent::EVENT_RENDER, function($e) use ($sm, $routes) {
$route = $e->getRouteMatch()->getMatchedRouteName();
if (!in_array($route, $routes)) {
return;
}
$response = $e->getResponse();
$content = $response->getContent();
$cache = $sm->get('cache-service');
$key = 'route-cache-' . $route;
$cache->setItem($key, $content);
}, -1000); // Late, then rendering has happened
}
}
Just make sure you register a cache instance under cache-service in the service manager. You can update above example to check during the render event if the route is in the $routes array. Now you just check if the cache has the key, which might be slower than doing in_array($route, $routes) like during the render event.