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Excerpts from TommyLike Hu's message of 2016-10-17 14:46:36 +0000:
> It's used in testcase already, and basic codes is from here:
> https://github.com/openstack/manila/blob/master/manila_tempest_tests/utils.py#L93

OK, I guess the real question I had is why use *random* addresses.
Because that seems like a way to end up having two tests try to use the
same address at the same time. If that did happen, would it cause
conflicts or race conditions for the manila tests?

> 
> Doug Hellmann <doug at doughellmann.com>于2016年10月17日周一 下午10:13写道：
> 
> > Excerpts from TommyLike Hu's message of 2016-10-17 09:56:15 +0000:
> > > When I handle some stuff related to Manila recently, I found a case which
> > > may be suitable for Oslo, Anyhow I put it in the maillist so it can be
> > > discussed before I put it in action.
> > > In testcase, we need a function(maybe 2) to generate random ip address
> > (or
> > > network), also they should in the range of [1](ipv4 documentation range)
> > or
> > > [2](ipv6 documentation range), this is the draft code for ipv4:
> > >
> > > import six
> > > import random
> > >
> > >
> > > def rand_ipv4(network=False):
> > >     """This uses the TEST-NET-3 range of reserved IP addresses."""
> > >
> > >     test_net_3 = '203.0.113.'
> > >     if network:
> > >         host_length = random.randint(0, 8)
> > >         address_segment = random.randint(0, 8 - host_length)
> > >         address_segment <<= host_length
> > >         address = test_net_3 + six.text_type(address_segment)
> > >         address = '/'.join((address,
> > >                             six.text_type(32 - host_length)))
> > >     else:
> > >         address = test_net_3 + six.text_type(random.randint(0, 255))
> > >     return address
> > >
> > > The primary use case here is writing testcases,  I am not sure whether it
> > > is suitable here, or maybe I misunderstood the intention of TEST-NET-3,
> > > please leave any comment you like.
> > >
> > >
> > > [1]  https://tools.ietf.org/html/rfc5737
> > > [2]  https://tools.ietf.org/html/rfc5156
> >
> > In what way are you using random addresses in tests?
> >
> > Doug
> >
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