Falcon-deps

Dependency injector for Falcon Framework based on taskiq-dependencies.

Installation

Install with pip

pip install falcon-deps

Install with poetry

poetry add falcon-deps

Usage

Start Usage

It's simple as possible.

from falcon_deps import InjectableResource
from falcon.asgi import App, Request, Response
from taskiq_dependencies import Depends


# Imagine we have a database pool.
async def db_pool(
    # Retrieve request object from the actual request.
    request: Request = Depends(),
) -> ConnectionPool:
    return request.context._pool


class Resource(InjectableResource):
    async def on_get(
        self,
        request: Request,
        response: Response,
        # Retrieve database pool as a dependency
        db_pool: ConnctionPool = Depends(db_pool)
    ) -> None:
        ...


app = App()
app.add_route(
    "/test",
    Resource(),
)

Advanced Usage

Falcon gives option to specify suffix for resource. If you want to use suffix with InjectableResource you need to pass suffix to InjectableResource too.

app.add_route(
    "/test",
    Resource(suffix="bob",),
    suffix="bob",
)

If some of methods in Resource don't need dependency injection, it's possible to remove them from injection with exclude_responder_from_inject.

app.add_route(
    "/test",
    Resource(
        exclude_responder_from_inject={
            # Remove on_get and on_post methods from injection.
            "on_get",
            "on_post",
        },
    ),
)