config: Handle interface list in CloudRegion.get_all_version_data

If a connection is created via an oslo.config cfg.ConfigOpts object,
then it's possible for interface to be a list of interfaces (due to
valid_interfaces). We were not previously handling this, resulting in
the following error:

  ❯ python -m cfg_test --config-file sample.conf
  Traceback (most recent call last):
    File "<frozen runpy>", line 198, in _run_module_as_main
    File "<frozen runpy>", line 88, in _run_code
    File "/dev/cfg-test/__main__.py", line 25, in <module>
      print(conn.config.get_all_version_data('placement'))
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
    File "/dev/openstacksdk/openstack/config/cloud_region.py", line 926, in get_all_version_data
      interface_versions = region_versions.get(interface, {})
  TypeError: unhashable type: 'list'

Correct this by iterating through all interfaces until we find a
non-null version information.

Change-Id: I6e5e1b0f5357afa0462703eb18b9f2da340e90a4
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

openstack/config/cloud_region.py

@@ -909,22 +909,36 @@ class CloudRegion:
     def get_all_version_data(
         self, service_type: str
     ) -> list[discover.VersionData]:
+        """Retrieve version data for the given service.
+
+        :param service_type: The service to fetch version data for.
+        :returns: A `~keystoneauth1.discover.VersionData` object containing the
+            version data for the requested service.
+        """
         # Seriously. Don't think about the existential crisis
         # that is the next line. You'll wind up in cthulhu's lair.
         service_type = self.get_service_type(service_type)
         region_name = self.get_region_name(service_type)
+        assert region_name is not None  # narrow type
+        interface = self.get_interface(service_type)
+        assert interface is not None  # narrow type
+
+        interfaces = interface if isinstance(interface, list) else [interface]
+
         versions = self.get_session().get_all_version_data(
             service_type=service_type,
-            interface=self.get_interface(service_type),
+            interface=interface,
             region_name=region_name,
         )
 
-        region_versions = versions.get(region_name, {})  # type: ignore
+        region_versions = versions.get(region_name, {})
-        interface_versions = region_versions.get(
+        for interface in interfaces:
-            self.get_interface(service_type),  # type: ignore
+            interface_versions = region_versions.get(interface, {})
-            {},
+            service_version_data = interface_versions.get(service_type)
-        )
+            if service_version_data is not None:
-        return interface_versions.get(service_type, [])
+                return service_version_data
+
+        return []
 
     def _get_endpoint_from_catalog(
         self,

openstack/connection.py

@@ -134,8 +134,8 @@ construct a Connection with the ``CONF`` object and an authenticated Session.
 .. code-block:: python
 
     from keystoneauth1 import loading as ks_loading
-    from oslo_config import cfg
     from openstack import connection
+    from oslo_config import cfg
 
     CONF = cfg.CONF