[QUESTION] uvicorn can't reload when i use apscheduler and fastapi together

when i use apscheduler and fastapi together like this:

def get_app():
    app = FastAPI()
    return app

def apscheduler():
    scheduler = AsyncIOScheduler()
    scheduler.add_job(my_jobs.tick, 'cron', hour=2, minute=0)
    deadline = datetime.datetime.now().replace(microsecond=0) + datetime.timedelta(seconds=5)
    scheduler.add_job(my_jobs.tick, 'date', run_date=deadline)
    try:
        scheduler.start()
    except Exception as e:
        scheduler.shutdown()

apscheduler()
app = get_app()

uvicorn can’t reload automaticly like before here is my start command:

uvicorn main:app --reload

Thank you very much if anyone can help.

[selimb]

@anne17 That’s a perfect use of app.state 😃 IMO this is a better practice than initializing everything at import time in the module scope, as recommended in the docs.

[anne17]

For me it worked to shut down the scheduler in the shutdown event as suggested by @selimb. I am not sure at all if this is best practice, but I store the scheduler in app.state in the startup event and then I can access it later:

@app.on_event("startup")
async def start_scheduler():
    scheduler = AsyncIOScheduler(timezone="Europe/Stockholm")
    scheduler.add_job(...)
    scheduler.start()
    app.state.scheduler = scheduler


@app.on_event("shutdown")
async def stop_scheduler():
    app.state.scheduler.shutdown(wait=False)

Now uvicorn’s --reload works as it should.