How to get or create Context in HttpCacheHitEvent subscriber? - symfony

Question

I have a subscriber class subscribing to HttpCacheHitEvent. I want to extract context specific data from other objects. I have been using Context::createDefaultContext() before, but that does not account different parameters of the request such as the locale.
Whats the best way to get or create a context from HttpCacheHitEvent?

Answer 1

You have to start the session, grab the token of it and resolve than the Context using SalesChannelContextFactory.
I cannot recommend doing this as it will make the HttpCache much slower. Maybe you can set cookies to the browser and use them there?

Answer 2

You can inject the service SalesChannelRequestContextResolver and use it in combination with the router service to assemble a SalesChannelContext (and subsequently the Context) from the resolved Request.
<service id="Foo\MyPlugin\CacheHitListener">
<argument type="service" id="router"/>
<argument type="service" id="Shopware\Core\Framework\Routing\SalesChannelRequestContextResolver"/>
<tag name="kernel.event_subscriber"/>
</service>
class CacheHitListener implements EventSubscriberInterface
{
private $matcher;
private RequestContextResolverInterface $contextResolver;
/**
* #param UrlMatcherInterface|RequestMatcherInterface $matcher
*/
public function __construct($matcher, RequestContextResolverInterface $contextResolver)
{
$this->matcher = $matcher;
$this->contextResolver = $contextResolver;
}
public static function getSubscribedEvents(): array
{
return [HttpCacheHitEvent::class => 'onCacheHit'];
}
public function onCacheHit(HttpCacheHitEvent $event): void
{
if ($this->matcher instanceof RequestMatcherInterface) {
$parameters = $this->matcher->matchRequest($event->getRequest());
} else {
$parameters = $this->matcher->match($event->getRequest()->getPathInfo());
}
$event->getRequest()->attributes->add($parameters);
$this->contextResolver->resolve($event->getRequest());
$context = $event->getRequest()->attributes->get(PlatformRequest::ATTRIBUTE_CONTEXT_OBJECT);
// ...
}
}
You can also get the SalesChannelContext like this:
$request->attributes->get(PlatformRequest::ATTRIBUTE_SALES_CHANNEL_CONTEXT_OBJECT);