[Refactor code] Support dynamic load Client module

- Support dynamic load Client module depend on given version.
  At this time, Zunclient has only 1 version, but this patch
  will be useful in the future.
- Change related test cases.
- Remove hardcode version.

Change-Id: I49403d88c6d64577d5a6c1a11e36a6d4c3bf0eba

zunclient/client.py

@@ -12,13 +12,29 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from zunclient.v1 import client
+from oslo_utils import importutils
+
+from zunclient import api_versions
+from zunclient import exceptions
+from zunclient.i18n import _
 
 
-def Client(version='1', **kwargs):
-    """Factory function to create a new container service client."""
-    if version != '1':
-        raise ValueError(
-            "zun only has one API version. Valid values for 'version'"
-            " are '1'")
-    return client.Client(**kwargs)
+def _get_client_class_and_version(version):
+    if not isinstance(version, api_versions.APIVersion):
+        version = api_versions.get_api_version(version)
+    else:
+        api_versions.check_major_version(version)
+    if version.is_latest():
+        raise exceptions.UnsupportedVersion(
+            _('The version should be explicit, not latest.'))
+    return version, importutils.import_class(
+        'zunclient.v%s.client.Client' % version.ver_major)
+
+
+def Client(version='1', username=None, auth_url=None, **kwargs):
+    """Initialize client objects based on given version"""
+    api_version, client_class = _get_client_class_and_version(version)
+    return client_class(api_version=api_version,
+                        auth_url=auth_url,
+                        username=username,
+                        **kwargs)

zunclient/tests/unit/test_client.py

@@ -15,24 +15,35 @@
 import mock
 import testtools
 
+from zunclient import api_versions
 from zunclient import client
+from zunclient import exceptions
 
 
 class ClientTest(testtools.TestCase):
 
     @mock.patch('zunclient.v1.client.Client')
-    def test_no_version_argument(self, mock_zun_client):
-        client.Client(input_auth_token='mytoken', zun_url='http://myurl/')
-        mock_zun_client.assert_called_with(
-            input_auth_token='mytoken', zun_url='http://myurl/')
+    def test_no_version_argument(self, mock_zun_client_v1):
+        client.Client(auth_url='http://example/identity',
+                      username='admin')
+        api_version = api_versions.get_api_version('1')
+        mock_zun_client_v1.assert_called_with(
+            api_version=api_version,
+            auth_url='http://example/identity',
+            username='admin')
 
     @mock.patch('zunclient.v1.client.Client')
-    def test_valid_version_argument(self, mock_zun_client):
-        client.Client(version='1', zun_url='http://myurl/')
-        mock_zun_client.assert_called_with(zun_url='http://myurl/')
+    def test_valid_version_argument(self, mock_zun_client_v1):
+        client.Client(version='1',
+                      auth_url='http://example/identity',
+                      username='admin')
+        api_version = api_versions.get_api_version('1')
+        mock_zun_client_v1.assert_called_with(
+            api_version=api_version,
+            auth_url='http://example/identity',
+            username='admin')
 
-    @mock.patch('zunclient.v1.client.Client')
-    def test_invalid_version_argument(self, mock_zun_client):
+    def test_invalid_version_argument(self):
         self.assertRaises(
-            ValueError,
-            client.Client, version='2', zun_url='http://myurl/')
+            exceptions.UnsupportedVersion,
+            client.Client, version='2')