The eventlet.monkey_patch is not valid under uwsgi mode

[Yikun Jiang]

There was a eventlet.monkey_patch [1] when we launch a nova process(like nova-api, nova-compute), but it's invalid under the uwsgi mode.

So, we need do same monkey_patch when we setup uwsgi appilication.

[1] https://github.com/openstack/nova/blob/233ea58/nova/cmd/__init__.py#L26

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/592285
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=23ba1c690652832c655d57476630f02c268c87ae
Submitter: Zuul
Branch: master

commit 23ba1c690652832c655d57476630f02c268c87ae
Author: Yikun Jiang <email address hidden>
Date: Thu Aug 16 14:29:26 2018 +0800

    Make monkey patch work in uWSGI mode

    There was a eventlet.monkey_patch [1] when we launch a nova
    process(like nova-api, nova-compute), but it's invalid under
    the uwsgi mode.

    But there are concurrency requirements in the api service, such
    as, when listing instances cross multiple cells we're using
    greenthreads and oslo.db does a time.sleep to allow switching
    greenthreads [2].

    So, in this patch we add the monkey_patch in the uwsgi
    application setup and refactor the monkey patching to use common
    code.

    [1] https://github.com/openstack/nova/blob/233ea58/nova/cmd/__init__.py#L26
    [2] https://github.com/openstack/oslo.db/blob/9c66959/oslo_db/sqlalchemy/engines.py#L51

    Closes-bug: #1787331

    Change-Id: Ie7bf5d012e2ccbcd63c262ddaf739782afcdaf56

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 19.0.0.0rc1 release candidate.