oslo.config allows us to configure groups and options dynamically. This
can cause a race with our logging as we attempt to iterate through
option groups that are changing under our feet. This wouldn't be a huge
issue, since these are just logs are we can always log again, if needed,
but we store groups in a dictionary and Python doesn't like us changing
the size of a dict it's iterating through:
RuntimeError: dictionary changed size during iteration
Given that we're only reading through this option group and don't need
to worry about a group _disappearing_, the solution is pretty simple:
create a copy of our option group names ahead of time so we don't need
to worry about new ones coming and messing things up.
No tests are included since this is a race and the only way I see to
reproduce this would involve lots of ugly threading.
Change-Id: Id3b28465d645a24f0fcebff2dd68a9bd30e21594
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
Closes-Bug: #1856312
e3e2ba55ee