cinderclient might not return version for V2 API

The get_server_version call in cidnerclient/client.py relies on
either finding v 3.x or encountering an exception to revert back
to v 2.0.  It's not clear that this call will always raise if
a non V3 capable Cinder is called, so just to be safe make sure
we return a 2.0 response if there's no V3 reported back.

Change-Id: I3b5fb895cad4b85d5f4ea286fb33f7dd0929e691
Closes-Bug: #1694729

cinderclient/client.py

@@ -78,6 +78,8 @@ def get_server_version(url):
     :returns: APIVersion object for min and max version supported by
               the server
     """
+    min_version = "2.0"
+    current_version = "2.0"
 
     logger = logging.getLogger(__name__)
     try:
@@ -87,12 +89,14 @@ def get_server_version(url):
         versions = data['versions']
         for version in versions:
             if '3.' in version['version']:
-                return (api_versions.APIVersion(version['min_version']),
-                        api_versions.APIVersion(version['version']))
+                min_version = version['min_version']
+                current_version = version['version']
+                break
     except exceptions.ClientException as e:
         logger.warning("Error in server version query:%s\n"
                        "Returning APIVersion 2.0", six.text_type(e.message))
-        return api_versions.APIVersion("2.0"), api_versions.APIVersion("2.0")
+    return (api_versions.APIVersion(min_version),
+            api_versions.APIVersion(current_version))
 
 
 def get_highest_client_server_version(url):

cinderclient/tests/unit/test_client.py

@@ -315,6 +315,22 @@ class ClientTestSensitiveInfo(utils.TestCase):
 @ddt.ddt
 class GetAPIVersionTestCase(utils.TestCase):
 
+    @mock.patch('cinderclient.client.requests.get')
+    def test_get_server_version_v2(self, mock_request):
+
+        mock_response = utils.TestResponse({
+            "status_code": 200,
+            "text": json.dumps(fakes.fake_request_get_no_v3())
+        })
+
+        mock_request.return_value = mock_response
+
+        url = "http://192.168.122.127:8776/v2/e5526285ebd741b1819393f772f11fc3"
+
+        min_version, max_version = cinderclient.client.get_server_version(url)
+        self.assertEqual(api_versions.APIVersion('2.0'), min_version)
+        self.assertEqual(api_versions.APIVersion('2.0'), max_version)
+
     @mock.patch('cinderclient.client.requests.get')
     def test_get_server_version(self, mock_request):
 

cinderclient/tests/unit/v3/fakes.py

@@ -612,3 +612,31 @@ def fake_request_get():
                               'updated': '2016-02-08T12:20:21Z',
                               'version': '3.16'}]}
     return versions
+
+
+def fake_request_get_no_v3():
+    versions = {'versions': [{'id': 'v1.0',
+                              'links': [{'href': 'http://docs.openstack.org/',
+                                         'rel': 'describedby',
+                                         'type': 'text/html'},
+                                        {'href': 'http://192.168.122.197/v1/',
+                                         'rel': 'self'}],
+                              'media-types': [{'base': 'application/json',
+                                               'type': 'application/'}],
+                              'min_version': '',
+                              'status': 'DEPRECATED',
+                              'updated': '2016-05-02T20:25:19Z',
+                              'version': ''},
+                             {'id': 'v2.0',
+                              'links': [{'href': 'http://docs.openstack.org/',
+                                         'rel': 'describedby',
+                                         'type': 'text/html'},
+                                        {'href': 'http://192.168.122.197/v2/',
+                                         'rel': 'self'}],
+                              'media-types': [{'base': 'application/json',
+                                               'type': 'application/'}],
+                              'min_version': '',
+                              'status': 'SUPPORTED',
+                              'updated': '2014-06-28T12:20:21Z',
+                              'version': ''}]}
+    return versions