[openstack-dev] Removing Keystoneauth Dependency in Castellan Discussion

Doug Hellmann doug at doughellmann.com
Wed Dec 6 22:12:32 UTC 2017

Excerpts from Gage Hugo's message of 2017-12-06 15:16:14 -0600:
> It's been a bit since the summit but I believe this was also discussed at
> the Denver PTG as well:  https://etherpad.openstack.org/p/oslo-ptg-queens
> The keystoneauth stuff seems to be more from Sydney, but if I remember
> correctly, Castellan authenticates through keystoneauth and passes the
> session to barbicanclient.  This is the only use of keystoneauth within
> Castellan, so one idea that was mentioned was to see if Castellan could
> simply pass the credentials to barbicanclient, which would auth through
> keystoneauth instead, removing the dependency from Castellan.

It looks like Castellan tries to authenticate using the token from
the context in two separate cases [1]. That would cause the service
using castellan to connect to barbican as the user making the API
request. Removing the use of keystoneauth would mean that feature
would no longer work, and all requests to barbican would be made
as a hard-coded user.  That seems like a pretty fundamental difference
in behavior.

Which mode is used the most in the services that consume castellan

I'm still not understanding the real motivation for removing the
dependency. Is it just someone's notion of cleaning things up? Or is
there a runtime issue of some sort?


[1] http://git.openstack.org/cgit/openstack/castellan/tree/castellan/key_manager/barbican_key_manager.py#n140

> On Tue, Dec 5, 2017 at 10:54 AM, Doug Hellmann <doug at doughellmann.com>
> wrote:
> > Excerpts from ARORA, ROHAN's message of 2017-12-05 14:37:49 +0000:
> > > So from my understanding now, we are wanting to remove the HARD
> > dependency on Keystoneauth, not to remove it completely since that would
> > break the barbican client. Currently seeing if we just remove the
> > dependency from requirements.txt, if that stops Keystoneauth from being
> > used until you try to use the barbican.
> >
> > There would need to be more changes than that, because we still need the
> > package to be installed for testing the Barbican driver.
> >
> > Maybe if someone could explain what the issue is, I can offer more
> > detailed advice. What is wrong with having the keystoneauth dependency?
> > Is it breaking something? Is it interfering with some other library?
> >
> > Doug
> >
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