Make router and route classes configurable via subclassing

.gitignore

@@ -11,3 +11,5 @@ venv*/
 .python-version
 build/
 dist/
+.idea
+/.venv/

starlette/applications.py

@@ -25,7 +25,11 @@
 
 
 class Starlette:
-    """Creates an Starlette application."""
+    """Creates a Starlette application."""
+
+    # This is the default router class used by Starlette. if you want to customized router have to
+    # override this variable in your subclass.
+    router_class = Router
 
     def __init__(
         self: AppType,
@@ -71,7 +75,7 @@ def __init__(
 
         self.debug = debug
         self.state = State()
-        self.router = Router(routes, on_startup=on_startup, on_shutdown=on_shutdown, lifespan=lifespan)
+        self.router = self.router_class(routes, on_startup=on_startup, on_shutdown=on_shutdown, lifespan=lifespan)
         self.exception_handlers = {} if exception_handlers is None else dict(exception_handlers)
         self.user_middleware = [] if middleware is None else list(middleware)
         self.middleware_stack: ASGIApp | None = None

starlette/routing.py

@@ -576,6 +576,11 @@ def __call__(self: _T, app: object) -> _T:
 
 
 class Router:
+    # The default route and websocket route classes. if you want to use customized route classes
+    # you have to override this class variables in your subclass.
+    route_class = Route
+    websocket_route_class = WebSocketRoute
+
     def __init__(
         self,
         routes: typing.Sequence[BaseRoute] | None = None,
@@ -782,7 +787,7 @@ def add_route(
         name: str | None = None,
         include_in_schema: bool = True,
     ) -> None:  # pragma: no cover
-        route = Route(
+        route = self.route_class(
             path,
             endpoint=endpoint,
             methods=methods,
@@ -797,7 +802,7 @@ def add_websocket_route(
         endpoint: typing.Callable[[WebSocket], typing.Awaitable[None]],
         name: str | None = None,
     ) -> None:  # pragma: no cover
-        route = WebSocketRoute(path, endpoint=endpoint, name=name)
+        route = self.websocket_route_class(path, endpoint=endpoint, name=name)
         self.routes.append(route)
 
     def route(