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Hi all,

there were some moves recently to make monkey patching strategy sane
in neutron.

This was triggered by some bugs found when interacting with external
oslo libraries [1], and a cross project spec to make eventlet usage
sane throughout the project [2].

Specifically, instead of monkey patching stdlib in each of services
and agents (and forgetting to do so for some of them [3]), we should
monkey patch it as part of a common import (ideally, it would be any
neutron.* import).

Initially, we've tried to patch it inside neutron/__init__.py [4], but
it didn't place nice with some advanced services importing from
neutron while not expecting stdlib to be patched, and so was reverted.

So an alternative that I currently look into is "the Nova way".
Specifically, moving all main() functions for all agents and services
into neutron/cmd/... and monkey patching stdlib thru
neutron/cmd/__init__.py.

I've sent a series of patches to do just that [5]. It was rightfully
blocked by Mark to seek for broader agreement.

I encourage community to say your word on the direction.

[1]: https://bugs.launchpad.net/oslo.concurrency/+bug/1418541
[2]: https://review.openstack.org/154642
[3]:
http://git.openstack.org/cgit/openstack/neutron/tree/neutron/plugins/mlnx/agent/eswitch_neutron_agent.py
[4]: https://review.openstack.org/153699
[5]:
https://review.openstack.org/#/q/status:open+project:openstack/neutron+branch:master+topic:bug/1418541,n,z

Cheers,
/Ihar
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