Support for reporting backend state in service list

This patch will support the feature: report backend state in service list
in client side.

Depends-On: I561dca3ef7c1901401621bc112389dbd178a907e

Change-Id: If15e1fa50b5feecd74c7394c918f4fc9d87bcf3e
Implements: blueprint report-backend-state-in-service-list

cinderclient/api_versions.py

@@ -29,7 +29,7 @@ LOG = logging.getLogger(__name__)
 # key is a deprecated version and value is an alternative version.
 DEPRECATED_VERSIONS = {"1": "2"}
 DEPRECATED_VERSION = "2.0"
-MAX_VERSION = "3.48"
+MAX_VERSION = "3.49"
 MIN_VERSION = "3.0"
 
 _SUBSTITUTIONS = {}

cinderclient/tests/unit/v3/fakes.py

@@ -145,6 +145,7 @@ class FakeHTTPClient(fake_v2.FakeHTTPClient):
                 'state': 'up',
                 'updated_at': datetime(2012, 10, 29, 13, 42, 2),
                 'cluster': 'cluster1',
+                'backend_state': 'up',
             },
             {
                 'id': 2,
@@ -155,6 +156,7 @@ class FakeHTTPClient(fake_v2.FakeHTTPClient):
                 'state': 'down',
                 'updated_at': datetime(2012, 9, 18, 8, 3, 38),
                 'cluster': 'cluster1',
+                'backend_state': 'down',
             },
             {
                 'id': 3,
@@ -174,6 +176,11 @@ class FakeHTTPClient(fake_v2.FakeHTTPClient):
         if not self.api_version.matches('3.7'):
             for svc in services:
                 del svc['cluster']
+
+        if not self.api_version.matches('3.49'):
+            for svc in services:
+                if svc['binary'] == 'cinder-volume':
+                    del svc['backend_state']
         return (200, {}, {'services': services})
 
     #

cinderclient/tests/unit/v3/test_services.py

@@ -79,3 +79,17 @@ class ServicesTest(utils.TestCase):
                                       loaded=True)]
         # Since it will be sorted by the prefix we can compare them directly
         self.assertListEqual(expected, result)
+
+    def test_list_services_with_backend_state(self):
+        cs = fakes.FakeClient(api_version=api_versions.APIVersion('3.49'))
+        services_list = cs.services.list()
+        cs.assert_called('GET', '/os-services')
+        self.assertEqual(3, len(services_list))
+        for service in services_list:
+            self.assertIsInstance(service, services.Service)
+            # Make sure backend_state fields from v3.49 is present and not
+            # None
+            if service.binary == 'cinder-volume':
+                self.assertIsNotNone(getattr(service, 'backend_state',
+                                             None))
+        self._assert_request_id(services_list)

cinderclient/v3/shell.py

@@ -1597,6 +1597,8 @@ def do_service_list(cs, args):
     # so as not to add the column when the extended ext is not enabled.
     if result and hasattr(result[0], 'disabled_reason'):
         columns.append("Disabled Reason")
+    if cs.api_version.matches('3.49'):
+        columns.extend(["Backend State"])
     utils.print_list(result, columns)