FreeNAS

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Hello,

For those unaware, I have been working on porting our middleware
(middlewared) to use python asyncio [1].

This branch [2] is in the final stage of development (I am fixing a
few minor issues) and I was planning on merging that to master on
Friday.

In my opinion asyncio is a much more powerful "tool" to write
single-threaded concurrent code than gevent (what we currently use).

One can't really compare asyncio and gevent on a 1:1 basis because
gevent is built on top of greenlet (another event loop implementation,
so it would make more sense to compare asyncio to that). Both provide
co-routines in python, however asyncio does things explicitly as
opposed to implicitly on gevent (by monkey patching python system
modules).

That allow us to take more advantage of process/thread pool without
having to worry with system modules being patched and block the event
loop.

That being said, I would like to urge anyone working on middlewared or
python-savvy to take a look at the diff [2] and tell me if you have
any concerns.

[1] https://docs.python.org/3/library/asyncio.html
[2] https://github.com/freenas/freenas/compare/feature/asyncio

Thanks! ====