refactor(routing)!: Refactor routes and route handlers (#3386)

* remove handler names
* Remove option handler creation from HTTPRoute
* Remove methods attribute from BaseRoute
* Move kwargs model to handlers and creation to on_registration
* Store kwargs model on handlers instead of routes
* Simplify HTTPRoute route_handler_map creation
* Simplify Router.route_handler_method_map
* Relax typing of HTTPRoute
* Move handling logic to route handlers
* Remove scope_type
* Don't pass route to HTTPRouteHandler during handling
* Don't pass scope to handle methods
* Resolve and establish connections in routes; Only pass connections to handlers

---------

Co-authored-by: Jacob Coffee <[email protected]>
Co-authored-by: Peter Schutt <[email protected]>

litestar/handlers/http_handlers/base.py

@@ -599,6 +599,14 @@ def on_registration(self, app: Litestar, route: BaseRoute) -> None:
 
         self._get_kwargs_model_for_route(route.path_parameters)
 
+    def _get_kwargs_model_for_route(self, path_parameters: Iterable[str]) -> KwargsModel:
+        key = tuple(path_parameters)
+        if (model := self._kwargs_models.get(key)) is None:
+            model = self._kwargs_models[key] = self._create_kwargs_model(path_parameters)
+        return model
+
+        self._get_kwargs_model_for_route(route.path_parameters)
+
     def _get_kwargs_model_for_route(self, path_parameters: Iterable[str]) -> KwargsModel:
         key = tuple(path_parameters)
         if (model := self._kwargs_models.get(key)) is None:

litestar/handlers/websocket_handlers/route_handler.py

@@ -5,6 +5,7 @@
 from litestar.connection import WebSocket
 from litestar.exceptions import ImproperlyConfiguredException
 from litestar.handlers import BaseRouteHandler
+from litestar.types import Empty
 from litestar.types import AsyncAnyCallable, Empty
 from litestar.types.builtin_types import NoneType
 from litestar.utils.predicates import is_async_callable