How to inject Fastenv to FastAPI methods

[clabnet]

Hello,
I have a FastAPI project, and Fastenv load fine a .env file during FastAPI startup:

async def lifespan(app: FastAPI):
    """Loading .env file"""
    mysettings = await dot_env.load_my_dotenv()

Sorry for dumb question:

• how to pass mysettings to other FastAPI methods ?
  (to avoid read multiple times the same .env file)

Thank you in advance

[br3ndonland]

Thanks for your interest @clabnet. It's a good question and I was thinking I should write some docs to more clearly explain this topic.

I agree with your suggestion of using a lifespan event. I would just modify it slightly. To access your DotEnv model after the application starts up, maybe you could set it as an attribute on your FastAPI instance.

from contextlib import asynccontextmanager

import fastenv
from fastapi import FastAPI


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Load .env file"""
    settings = await fastenv.load_dotenv(".env", find_source=True)
    app.settings = settings
    yield


app = FastAPI(lifespan=lifespan)

Let me know how it goes.

[clabnet]

Yes it work, thank's

[br3ndonland]

I've added an improved example to the quickstart in the README and docs using lifespan state instead of setting an attribute on the FastAPI app instance. Either way will work, but lifespan state is the recommended way to share objects between the lifespan function and API endpoints.