Don't create client for help and bash completion

Currently when we need a help, client object is created
and authentication is performed. This is completely useless
and leads to unnecessary actions in the background.

This patch prevents creation of client object (and therefore
authentication) for help or bash-completion commands.

Change-Id: I08ee73980efc1e84d91868e451e11fa5fe547bf4

glareclient/shell.py

@@ -1,4 +1,4 @@
-# Copyright 2015 - StackStorm, Inc.
+# Copyright 2017 - Nokia Networks
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -261,17 +261,28 @@ class GlareShell(app.App):
         self._clear_shell_commands()
         self._set_shell_commands(self._get_commands())
 
-        do_help = ('help' in argv) or ('-h' in argv) or not argv
+        # bash-completion and help messages should not require client creation
+        need_client = not (
+            ('bash-completion' in argv) or
+            ('help' in argv) or
+            ('-h' in argv) or
+            ('--help' in argv) or
+            not argv)
 
-        # Set default for auth_url if not supplied. The default is not
-        # set at the parser to support use cases where auth is not enabled.
-        # An example use case would be a developer's environment.
+        self.client = self._create_client() if need_client else None
 
-        # bash-completion should not require authentification.
-        if do_help or ('bash-completion' in argv):
-            self.options.auth_url = None
+        # Adding client_manager variable to make glare client work with
+        # unified OpenStack client.
+        ClientManager = type(
+            'ClientManager',
+            (object,),
+            dict(artifact=self.client)
+        )
 
-        self.client = client.Client(
+        self.client_manager = ClientManager()
+
+    def _create_client(self):
+        return client.Client(
             endpoint=self.options.glare_url,
             auth_token=self.options.auth_token,
             keycloak_auth_url=self.options.keycloak_auth_url,
@@ -285,16 +296,6 @@ class GlareShell(app.App):
             insecure=self.options.insecure
         )
 
-        # Adding client_manager variable to make glare client work with
-        # unified OpenStack client.
-        ClientManager = type(
-            'ClientManager',
-            (object,),
-            dict(artifact=self.client)
-        )
-
-        self.client_manager = ClientManager()
-
     def _set_shell_commands(self, cmds_dict):
         for k, v in cmds_dict.items():
             self.command_manager.add_command(k, v)

glareclient/tests/unit/test_shell.py

@@ -0,0 +1,59 @@
+# Copyright 2015 Huawei Technologies Co., Ltd.
+#
+#    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.
+
+import mock
+import os
+import sys
+
+import six
+import testtools
+
+from glareclient import shell
+
+
+class TestShell(testtools.TestCase):
+
+    def shell(self, argstr):
+        orig = (sys.stdout, sys.stderr)
+        clean_env = {}
+        _old_env, os.environ = os.environ, clean_env.copy()
+
+        try:
+            sys.stdout = six.moves.cStringIO()
+            sys.stderr = six.moves.cStringIO()
+            _shell = shell.GlareShell()
+            _shell.run(argstr.split())
+        except SystemExit:
+            exc_type, exc_value, exc_traceback = sys.exc_info()
+            self.assertEqual(0, exc_value.code)
+        finally:
+            stdout = sys.stdout.getvalue()
+            stderr = sys.stderr.getvalue()
+            sys.stdout.close()
+            sys.stderr.close()
+            sys.stdout, sys.stderr = orig
+            os.environ = _old_env
+
+        return stdout, stderr
+
+    def test_help(self):
+        """Test that client is not created for help and bash complete"""
+        for command in ('-h',
+                        '--help',
+                        'help',
+                        'help workbook-list',
+                        'bash-completion'):
+            with mock.patch('glareclient.client.Client') as client_mock:
+                self.shell(command)
+                self.assertFalse(client_mock.called)