[Python] How can I integrate Python mido and asyncio?

I have a device which does file I/O over MIDI. I have a script using Mido that downloads files but it is a mess of global variables. I want to tidy it up to use asyncio properly but I am not sure how to integrate the mido callback. I think the documentation says I should use a Future object but I am not sure how the mido callback function can obtain that object.

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