on_loaded with app context

[xeor]

Is your feature request related to a problem

Is your feature request related to a problem? yes

I am building a plugin-system where both libs and routes can be plugins. Libs can be async, so I need them loaded using on_startup. But when I want the routes, I need access to the app object (which is not available at on_startup).

The solution you would like

I need to run code after on_startup is completed, but that code needs access to the app as well.

Something like

def myappstuff(app):
  app.include_router(...)

async def initialize_drivers():
  ...

FastAPI(
   ...
   on_startup=[initialize_drivers],
   on_loaded=[myappstuff]
)

Describe alternatives you've considered

• Putting everything after the app is available, but then I loose the possibility to do async
• A callback hook on driver initialization, but to where? I need app
• Putting router in on_startup, but then I loose the app

[xeor]

I found a way doing this using something like this:

def setup():
    """
    This function is called after app is available (via on_startup)
    """
    another.function(app)

app = FastAPI(
    ...
    on_startup=[..., startup],
)

[tiangolo]

Thanks for reporting back and closing the issue @xeor 👍

[github-actions[bot]]

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