Add support for plugin provided API resources.

Change-Id: I201461e255edb1bc5ca35e9c8c989cb777bb2924

moniker/api/v1/__init__.py

@@ -14,18 +14,22 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 import flask
-from moniker.api.v1.domains import blueprint as domains_blueprint
-from moniker.api.v1.records import blueprint as records_blueprint
-from moniker.api.v1.servers import blueprint as servers_blueprint
-from moniker.api.v1.tsigkeys import blueprint as tsigkeys_blueprint
+from stevedore import extension
+from moniker.openstack.common import log as logging
+
+LOG = logging.getLogger(__name__)
 
 
 def factory(global_config, **local_conf):
     app = flask.Flask('moniker.api.v1')
 
-    app.register_blueprint(domains_blueprint)
-    app.register_blueprint(records_blueprint)
-    app.register_blueprint(servers_blueprint)
-    app.register_blueprint(tsigkeys_blueprint)
+    # TODO(kiall): Ideally, we want to make use of the Plugin class here.
+    #              This works for the moment though.
+    mgr = extension.ExtensionManager('moniker.api.v1')
+
+    def _load_extension(ext):
+        app.register_blueprint(ext.plugin)
+
+    mgr.map(_load_extension)
 
     return app

setup.py

@@ -56,6 +56,12 @@ setup(
     ],
     cmdclass=common_setup.get_cmdclass(),
     entry_points=textwrap.dedent("""
+        [moniker.api.v1]
+        domains = moniker.api.v1.domains:blueprint
+        records = moniker.api.v1.records:blueprint
+        servers = moniker.api.v1.servers:blueprint
+        tsigkeys = moniker.api.v1.tsigkeys:blueprint
+
         [moniker.storage]
         sqlalchemy = moniker.storage.impl_sqlalchemy:SQLAlchemyStorage