Adds simple tenant usage support for the Nova V3 API

Adds support and tests for the os-simple-tenant-usage
extension for the Nova V3 API. There are no
differences between the V2 and V3 API and this change
adds the client code to enable the usage command. Note
that with nomenclature change from tenant to project
occuring in Nova there will be a difference between
the V2 and V3 API in the future.

Differences between the V2 and V3 API are described here:
https://wiki.openstack.org/wiki/NovaAPIv2tov3

Partially implements blueprint v3-api

Change-Id: Iddf6211c9c87cbb191d9a5d5a65710b343c30e67

novaclient/tests/v1_1/test_usage.py

@@ -18,16 +18,23 @@ from novaclient.tests.v1_1 import fakes
 from novaclient.v1_1 import usage
 
 
-cs = fakes.FakeClient()
-
-
 class UsageTest(utils.TestCase):
+    def setUp(self):
+        super(UsageTest, self).setUp()
+        self.cs = self._get_fake_client()
+        self.usage_type = self._get_usage_type()
+
+    def _get_fake_client(self):
+        return fakes.FakeClient()
+
+    def _get_usage_type(self):
+        return usage.Usage
 
     def test_usage_list(self, detailed=False):
         now = datetime.datetime.now()
-        usages = cs.usage.list(now, now, detailed)
+        usages = self.cs.usage.list(now, now, detailed)
 
-        cs.assert_called('GET',
+        self.cs.assert_called('GET',
                          "/os-simple-tenant-usage?" +
                          ("start=%s&" % now.isoformat()) +
                          ("end=%s&" % now.isoformat()) +
@@ -39,9 +46,9 @@ class UsageTest(utils.TestCase):
 
     def test_usage_get(self):
         now = datetime.datetime.now()
-        u = cs.usage.get("tenantfoo", now, now)
+        u = self.cs.usage.get("tenantfoo", now, now)
 
-        cs.assert_called('GET',
+        self.cs.assert_called('GET',
                          "/os-simple-tenant-usage/tenantfoo?" +
                          ("start=%s&" % now.isoformat()) +
                          ("end=%s" % now.isoformat()))

novaclient/tests/v3/test_usage.py

@@ -0,0 +1,30 @@
+#    Copyright 2013 IBM Corp.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from novaclient.tests.v1_1 import fakes
+from novaclient.tests.v1_1 import test_usage
+from novaclient.v3 import usage
+
+
+class UsageTest(test_usage.UsageTest):
+    def setUp(self):
+        super(UsageTest, self).setUp()
+        self.cs = self._get_fake_client()
+        self.usage_type = self._get_usage_type()
+
+    def _get_fake_client(self):
+        return fakes.FakeClient()
+
+    def _get_usage_type(self):
+        return usage.Usage

novaclient/v3/client.py

@@ -29,6 +29,7 @@ from novaclient.v3 import quota_classes
 from novaclient.v3 import quotas
 from novaclient.v3 import servers
 from novaclient.v3 import services
+from novaclient.v3 import usage
 
 
 class Client(object):
@@ -78,6 +79,7 @@ class Client(object):
         self.quota_classes = quota_classes.QuotaClassSetManager(self)
         self.servers = servers.ServerManager(self)
         self.services = services.ServiceManager(self)
+        self.usage = usage.UsageManager(self)
 
         # Add in any extensions...
         if extensions:

novaclient/v3/usage.py

@@ -0,0 +1,27 @@
+# Copyright 2013 IBM Corp.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+"""
+Usage interface.
+"""
+
+from novaclient.v1_1 import usage
+
+
+class Usage(usage.Usage):
+    pass
+
+
+class UsageManager(usage.UsageManager):
+    pass