I didn't read over your code, but this is something that I've
independently implemented. You can see my implementation at
<https://github.com/habnabit/polecat/blob/master/polecat.py>. The Site
subclass does some other monitoring-related things, but you should be
able to tease out just the graceful shutdown parts if that's all you
want.
Polecat needs some work and a lot of documentation, but for now, the way
to do a graceful shutdown is to make a PolecatSite and then
addSystemEventTrigger('before', 'shutdown',
yourPolecatSite.gracefullyStopActiveClients).
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