Proposal for adding on_shutdown signal

[asvetlov]

We need a way for closing long-running responses like websockets and data streaming,

The proposal does it by introducing on_shutdown signal and documenting the recommended way to use it.

Consider it as pre-requisite for #690

[fafhrd91]

+1

[asvetlov]

Added Application.shutdown() coroutine as straightforward way to call on_shutdown signal.

[fafhrd91]

could you add Application.shutdown() to gunicorn worker as well.

[asvetlov]

Sorry, I don't follow.
Do you mean Worker.close()?
It has no application attr, only make_handler accepts app parameter.
I suggest splitting the request into separate issue.
Please create the one.

[fafhrd91]

self.wsgi is Application object, worker should call shutdown() right after finish

[asvetlov]

Done

[lock]

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