Updated openstack/openstack
Project: openstack/oslo.messaging  1e8ef86626bea1c11797c2c84c66f47f393aaa12
null
Add transport aliases

We need to support deprecated transport driver configurations like:

 rpc_backend = nova.rpc.impl_kombu

i.e. 'nova.rpc.impl_kombu' is a deprecated alias for 'rabbit'.

Initially, we supported this by adding the aliases to each project's
setup.cfg:

oslo.messaging.drivers =
    nova.rpc.impl_kombu = oslo.messaging._drivers.impl_rabbit:RabbitDriver

However, this means that code like this:

  url = str(TransportURL(conf))

generates a bogus URL string like:

  nova.rpc.impl_kombu://...

We need to apply these transport aliases when we load drivers, but also
when we create transport URLs from configuration containing potentially
deprecated aliases.

To enable that, add an aliases parameter to TransportURL(),
TransportURL.parse() and get_transport().

blueprint: transport-aliases
Change-Id: Ifce68ff62746c2a363c719417a2bd0a78ee025dd