Driver registry

Uses automatic dependency injection to provide controllers with driver
interfaces (identity_api, token_api, etc).

See tests/test_injection.py for a self-contained example.

Change-Id: I255087de534292fbf57a45b19f97488f831f607c

1 files changed, 7 insertions, 6 deletions

diff --git a/keystone/routers.py b/keystone/routers.py
index fa980c2c..83f277dd 100644
--- a/keystone/routers.py
+++ b/keystone/routers.py
@@ -14,17 +14,18 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 """
-The only types of routers in this file should be ComposingRouters.
-The routers for the submodules should be in the module specific router files
-for example, the Composable Router for identity belongs in
-keystone/identity/routers.py
+The only types of routers in this file should be ``ComposingRouters``.
+
+The routers for the backends should be in the backend-specific router modules.
+For example, the ``ComposableRouter`` for ``identity`` belongs in::
+
+    keystone.identity.routers
+
 """
 
 
 from keystone.common import wsgi
-from keystone import catalog
 from keystone import controllers
-from keystone import exception
 
 
 class Extension(wsgi.ComposableRouter):