This can be a lot simpler. Just set "one_time_setup" to a single instance of the method, and all calls are waiting for the exact same run. If that doesnt work,

This can be a lot simpler. Just set "one_time_setup" to a single instance of the method, and all calls are waiting for the exact same run. If that doesnt work, then set it to an 'asyncio.event`, and run the one_time_setup "in the background" (create_task), and when its done it marks the event as complete.