Sweep: Make it easy to use custom `APIRouter`s

[xennygrimmato]

Details

I'm facing a problem when using a custom router becomes a real hack. The current hacky solution:

import redis.asyncio as redis
from fastapi import FastAPI, Depends

from cachepot.constants import CachePolicy
from cachepot.routing import CachedAPIRouter
from cachepot.storages.redis import RedisStorage

app = FastAPI()

app.router = CachedAPIRouter(
    dependency_overrides_provider=app,
    # define dependencies inside overridden router only
    dependencies=(Depends(...),),
)

# hack to finish setting up custom router
app.setup()

client = redis.from_url('redis://127.0.0.1:6379')
storage = RedisStorage(client)

cache_policy = CachePolicy(
    storage=storage,
    key='cached_hello_world',
    ttl=30,
)

# Do not use @app.route() due to incapability
@app.router.get(path='', cache_policy=cache_policy)
async def cached_hello_world():
    return {'result': 'hello, world!'}

As you can see, I have to patch app with a new router using

app.router = CachedAPIRouter()

and then call

app.setup()

to be able to use it. Also, direct

@app.router.get()

call is required because router doesn't support custom params.

Checklist

- [X] Modify `fastapi/applications.py` ✓ https://github.com/xennygrimmato/fastapi/commit/2b4088150457cec88d083a58069f7e624a540770 [Edit](https://github.com/xennygrimmato/fastapi/edit/sweep/make_it_easy_to_use_custom_apirouters/fastapi/applications.py#L1-L10) - [X] Running GitHub Actions for `fastapi/applications.py` ✓ [Edit](https://github.com/xennygrimmato/fastapi/edit/sweep/make_it_easy_to_use_custom_apirouters/fastapi/applications.py#L1-L10) - [X] Modify `fastapi/routing.py` ✓ https://github.com/xennygrimmato/fastapi/commit/b4e887117738e12830084c1a222f19d4e97b58d0 [Edit](https://github.com/xennygrimmato/fastapi/edit/sweep/make_it_easy_to_use_custom_apirouters/fastapi/routing.py#L541-L571) - [X] Running GitHub Actions for `fastapi/routing.py` ✓ [Edit](https://github.com/xennygrimmato/fastapi/edit/sweep/make_it_easy_to_use_custom_apirouters/fastapi/routing.py#L541-L571) - [X] Create `docs/en/docs/tutorial/using-custom-routers.md` ✓ https://github.com/xennygrimmato/fastapi/commit/0140952aa0143e3b89e090c487d1d88bcccb585d [Edit](https://github.com/xennygrimmato/fastapi/edit/sweep/make_it_easy_to_use_custom_apirouters/docs/en/docs/tutorial/using-custom-routers.md) - [X] Running GitHub Actions for `docs/en/docs/tutorial/using-custom-routers.md` ✓ [Edit](https://github.com/xennygrimmato/fastapi/edit/sweep/make_it_easy_to_use_custom_apirouters/docs/en/docs/tutorial/using-custom-routers.md)

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Step 1: 🔎 Searching

I found the following snippets in your repository. I will now analyze these snippets and come up with a plan.

Some code snippets I think are relevant in decreasing order of relevance (click to expand). If some file is missing from here, you can mention the path in the ticket description.

https://github.com/xennygrimmato/fastapi/blob/c7852b6c8e47d8130abc49673e29bbe58cd4cfff/fastapi/routing.py#L541-L571 https://github.com/xennygrimmato/fastapi/blob/c7852b6c8e47d8130abc49673e29bbe58cd4cfff/docs/en/docs/tutorial/bigger-applications.md#L67-L93 https://github.com/xennygrimmato/fastapi/blob/c7852b6c8e47d8130abc49673e29bbe58cd4cfff/docs_src/custom_request_and_route/tutorial003.py#L1-L38

---

Step 2: ⌨️ Coding

• [X] Modify fastapi/applications.py ✓ https://github.com/xennygrimmato/fastapi/commit/2b4088150457cec88d083a58069f7e624a540770 Edit

  Modify fastapi/applications.py with contents:
  • Add an optional parameter `router_class` to the `FastAPI` class constructor with a default value of `APIRouter`. This allows users to specify a custom router class when initializing a FastAPI application.
  • Inside the `FastAPI` class constructor, check if `router_class` is not `None` and is a subclass of `APIRouter`. If so, instantiate the custom router class and assign it to `self.router`. Otherwise, instantiate the default `APIRouter` class.
  • Ensure that the custom router instantiation correctly handles any dependencies, overrides, and custom parameters that might be required by the custom router class.
  • Update the documentation strings within the `FastAPI` class to include information about the new `router_class` parameter and how it can be used to specify a custom router.

--- 
+++ 
@@ -64,7 +64,8 @@
     def __init__(
         self: AppType,
         *,
-        debug: Annotated[
+        router_class: Type[routing.APIRouter] = routing.APIRouter,
+        **extra: Annotated[
             bool,
             Doc(
                 """
@@ -82,6 +83,8 @@
                 """
                 **Note**: you probably shouldn't use this parameter, it is inherited
                 from Starlette and supported for compatibility.
+                
+                * `router_class`: Custom router class to be used instead of the default `APIRouter`.

                 ---

@@ -857,7 +860,38 @@
                 This is not passed as a parameter to the `FastAPI` class to avoid
                 giving the false idea that FastAPI would generate a different OpenAPI
                 schema. It is only available as an attribute.
-
+        if router_class and issubclass(router_class, routing.APIRouter):
+            self.router = router_class(
+                routes=routes,
+                redirect_slashes=redirect_slashes,
+                dependency_overrides_provider=self,
+                on_startup=on_startup,
+                on_shutdown=on_shutdown,
+                lifespan=lifespan,
+                default_response_class=default_response_class,
+                dependencies=dependencies,
+                callbacks=callbacks,
+                deprecated=deprecated,
+                include_in_schema=include_in_schema,
+                responses=responses,
+                generate_unique_id_function=generate_unique_id_function,
+            )
+        else:
+            self.router = routing.APIRouter(
+                routes=routes,
+                redirect_slashes=redirect_slashes,
+                dependency_overrides_provider=self,
+                on_startup=on_startup,
+                on_shutdown=on_shutdown,
+                lifespan=lifespan,
+                default_response_class=default_response_class,
+                dependencies=dependencies,
+                callbacks=callbacks,
+                deprecated=deprecated,
+                include_in_schema=include_in_schema,
+                responses=responses,
+                generate_unique_id_function=generate_unique_id_function,
+            )
                 **Example**

                 ```python

• [X] Running GitHub Actions for fastapi/applications.py ✓ Edit

  Check fastapi/applications.py with contents:

Ran GitHub Actions for 2b4088150457cec88d083a58069f7e624a540770:

• [X] Modify fastapi/routing.py ✓ https://github.com/xennygrimmato/fastapi/commit/b4e887117738e12830084c1a222f19d4e97b58d0 Edit

  Modify fastapi/routing.py with contents:
  • Modify the `APIRouter` class to add support for custom parameters in route decorators. This involves updating the decorator methods (e.g., `get`, `post`, `put`, etc.) to accept arbitrary keyword arguments.
  • Store any custom parameters passed to the route decorators in the route's metadata. This will require modifying the internal representation of routes to include a field for custom metadata.
  • Ensure that the custom parameters are accessible within the route handler, possibly by adding them to the request state or passing them as additional arguments to the handler function.
  • Update the documentation strings within the `APIRouter` class to include information about the support for custom parameters in route decorators and how they can be used.

--- 
+++ 
@@ -1639,6 +1639,7 @@
                 [FastAPI docs about how to Generate Clients](https://fastapi.tiangolo.com/advanced/generate-clients/#custom-generate-unique-id-function).
                 """
             ),
+        **custom_params: Any,
         ] = Default(generate_unique_id),
     ) -> Callable[[DecoratedCallable], DecoratedCallable]:
         """
@@ -1680,10 +1681,12 @@
             response_model_exclude_none=response_model_exclude_none,
             include_in_schema=include_in_schema,
             response_class=response_class,
+        custom_params=custom_params,
             name=name,
             callbacks=callbacks,
             openapi_extra=openapi_extra,
-            generate_unique_id_function=generate_unique_id_function,
+        **custom_params: Any,
+        ] = Default(generate_unique_id),
         )

     def put(
@@ -1704,7 +1707,7 @@
             Doc(
                 """
                 The type to use for the response.
-
+        custom_params=custom_params,
                 It could be any valid Pydantic *field* type. So, it doesn't have to
                 be a Pydantic model, it could be other things, like a `list`, `dict`,
                 etc.
@@ -2435,19 +2438,22 @@
             responses=responses,
             deprecated=deprecated,
             methods=["POST"],
-            operation_id=operation_id,
+        **custom_params: Any,
+        ] = Default(generate_unique_id),
             response_model_include=response_model_include,
             response_model_exclude=response_model_exclude,
             response_model_by_alias=response_model_by_alias,
             response_model_exclude_unset=response_model_exclude_unset,
             response_model_exclude_defaults=response_model_exclude_defaults,
+        custom_params=custom_params,
             response_model_exclude_none=response_model_exclude_none,
             include_in_schema=include_in_schema,
             response_class=response_class,
             name=name,
             callbacks=callbacks,
             openapi_extra=openapi_extra,
-            generate_unique_id_function=generate_unique_id_function,
+        **custom_params: Any,
+        ] = Default(generate_unique_id),
         )

     def delete(
@@ -2468,7 +2474,7 @@
             Doc(
                 """
                 The type to use for the response.
-
+        custom_params=custom_params,
                 It could be any valid Pydantic *field* type. So, it doesn't have to
                 be a Pydantic model, it could be other things, like a `list`, `dict`,
                 etc.
@@ -2780,6 +2786,7 @@
                 [FastAPI docs about how to Generate Clients](https://fastapi.tiangolo.com/advanced/generate-clients/#custom-generate-unique-id-function).
                 """
             ),
+        **custom_params: Any,
         ] = Default(generate_unique_id),
     ) -> Callable[[DecoratedCallable], DecoratedCallable]:
         """
@@ -2818,13 +2825,15 @@
             response_model_by_alias=response_model_by_alias,
             response_model_exclude_unset=response_model_exclude_unset,
             response_model_exclude_defaults=response_model_exclude_defaults,
+        custom_params=custom_params,
             response_model_exclude_none=response_model_exclude_none,
             include_in_schema=include_in_schema,
             response_class=response_class,
             name=name,
             callbacks=callbacks,
             openapi_extra=openapi_extra,
-            generate_unique_id_function=generate_unique_id_function,
+        **custom_params: Any,
+        ] = Default(generate_unique_id),
         )

     def options(
@@ -2845,7 +2854,7 @@
             Doc(
                 """
                 The type to use for the response.
-
+        custom_params=custom_params,
                 It could be any valid Pydantic *field* type. So, it doesn't have to
                 be a Pydantic model, it could be other things, like a `list`, `dict`,
                 etc.
@@ -3157,6 +3166,7 @@
                 [FastAPI docs about how to Generate Clients](https://fastapi.tiangolo.com/advanced/generate-clients/#custom-generate-unique-id-function).
                 """
             ),
+        **custom_params: Any,
         ] = Default(generate_unique_id),
     ) -> Callable[[DecoratedCallable], DecoratedCallable]:
         """
@@ -3195,13 +3205,15 @@
             response_model_by_alias=response_model_by_alias,
             response_model_exclude_unset=response_model_exclude_unset,
             response_model_exclude_defaults=response_model_exclude_defaults,
+        custom_params=custom_params,
             response_model_exclude_none=response_model_exclude_none,
             include_in_schema=include_in_schema,
             response_class=response_class,
             name=name,
             callbacks=callbacks,
             openapi_extra=openapi_extra,
-            generate_unique_id_function=generate_unique_id_function,
+        **custom_params: Any,
+        ] = Default(generate_unique_id),
         )

     def head(
@@ -3222,7 +3234,7 @@
             Doc(
                 """
                 The type to use for the response.
-
+        custom_params=custom_params,
                 It could be any valid Pydantic *field* type. So, it doesn't have to
                 be a Pydantic model, it could be other things, like a `list`, `dict`,
                 etc.

• [X] Running GitHub Actions for fastapi/routing.py ✓ Edit

  Check fastapi/routing.py with contents:

Ran GitHub Actions for b4e887117738e12830084c1a222f19d4e97b58d0:

• [X] Create docs/en/docs/tutorial/using-custom-routers.md ✓ https://github.com/xennygrimmato/fastapi/commit/0140952aa0143e3b89e090c487d1d88bcccb585d Edit

  Create docs/en/docs/tutorial/using-custom-routers.md with contents:
  • Create a new documentation page titled "Using Custom Routers" under the "Tutorial" section.
  • In this documentation, explain how to define a custom router class by extending the `APIRouter` class and implementing any required custom logic.
  • Provide an example of how to initialize a FastAPI application with a custom router by passing the custom router class to the `FastAPI` constructor.
  • Include examples of how to use custom parameters in route decorators and how these parameters can be accessed within route handlers.
  • Reference the modified files `fastapi/applications.py` and `fastapi/routing.py` to provide context and additional details.

• [X] Running GitHub Actions for docs/en/docs/tutorial/using-custom-routers.md ✓ Edit

  Check docs/en/docs/tutorial/using-custom-routers.md with contents:

Ran GitHub Actions for 0140952aa0143e3b89e090c487d1d88bcccb585d:

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