Problem/Motivation
Drupal's Routing/RouteProvider caches the association between an incoming path and matching routes (including parameters), for each request. This happens after all other processes are done and after all processInbounds.
The thing is that it only explicitly provides the route_match cache tag for all those cache entries, in getRouteCollectionForRequest(Request $request), which doesn't make it possible to implement more selective cache invalidations in case you want the cache to expire only for a particular path/route.
$this->cache->set($cid, $cache_value, CacheBackendInterface::CACHE_PERMANENT, ['route_match']);
Proposed resolution
Provide a hook to allow modules to add their own cache tags for a specific path/route, based on the $request.
I'm providing a patch that introduces hook_routing_cache_tags(Request $request).
Example:
/**
* Allow modules to add their own cache tags to the routing cache object.
*
* RouteProvider stores the association of paths and routes in the cache.
* It only adds the generic tag 'route_match'. Modules can implement this hook
* to add more tags, based on the `$request`, in order to perform more
* selective cache invalidations.
*/
function hook_routing_cache_tags(Request $request) {
if ($request->getPathInfo() == 'some_path' || $request->attributes->get('some_attribute')) {
return [
'custom_tag:1',
'custom_tag:2',
'custom_tag:3',
];
}
}
Then, in your module, you invalidate the tags added to those specific paths:
Cache::invalidateTags(['custom_tag:1']);