Add configuration-default to OSC

This change adds database support to the python-openstackclient
project for the configuration-default command.

The trove command configuration-default is now:
    openstack database configuration default

Change-Id: I9403df629e893bb1c4d75566cffd3d49697a543d
Partially-Implements: blueprint trove-support-in-python-openstackclient

releasenotes/notes/add-configuration-default-to-osc-55867236d19d83c4.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    The command ``trove configuration-default`` is now available
+    to use in the python-openstackclient CLI as ``openstack
+    database configuration default``

setup.cfg

@@ -48,6 +48,7 @@ openstack.database.v1 =
     database_cluster_upgrade = troveclient.osc.v1.database_clusters:UpgradeDatabaseCluster
     database_configuration_attach = troveclient.osc.v1.database_configurations:AttachDatabaseConfiguration
     database_configuration_create = troveclient.osc.v1.database_configurations:CreateDatabaseConfiguration
+    database_configuration_default = troveclient.osc.v1.database_configurations:DefaultDatabaseConfiguration
     database_configuration_delete = troveclient.osc.v1.database_configurations:DeleteDatabaseConfiguration
     database_configuration_detach = troveclient.osc.v1.database_configurations:DetachDatabaseConfiguration
     database_configuration_instances = troveclient.osc.v1.database_configurations:ListDatabaseConfigurationInstances

troveclient/osc/v1/database_configurations.py

@@ -350,3 +350,25 @@ class ListDatabaseConfigurationInstances(command.Lister):
         instance = [osc_utils.get_item_properties(p, self.columns)
                     for p in params]
         return self.columns, instance
+
+
+class DefaultDatabaseConfiguration(command.ShowOne):
+    _description = _("Shows the default configuration of an instance.")
+
+    def get_parser(self, prog_name):
+        parser = super(DefaultDatabaseConfiguration, self).get_parser(
+            prog_name)
+        parser.add_argument(
+            'instance',
+            metavar='<instance>',
+            type=str,
+            help=_('ID or name of the instance.'),
+        )
+        return parser
+
+    def take_action(self, parsed_args):
+        db_instances = self.app.client_manager.database.instances
+        instance = osc_utils.find_resource(db_instances,
+                                           parsed_args.instance)
+        configs = db_instances.configuration(instance)
+        return zip(*sorted(six.iteritems(configs._info['configuration'])))

troveclient/tests/osc/v1/fakes.py

@@ -73,6 +73,9 @@ class FakeConfigurations(object):
                    [2]['configurations'])
     fake_config_instances = (fakes.FakeHTTPClient().
                              get_configurations_c_123_instances()[2])
+    fake_default_config = (
+        fakes.FakeHTTPClient().get_instances_1234_configuration()
+        [2]['instance'])
 
     def get_configurations_c_123(self):
         return configurations.Configuration(None, self.fake_config[0])
@@ -81,6 +84,9 @@ class FakeConfigurations(object):
         return [instances.Instance(None, fake_instance)
                 for fake_instance in self.fake_config_instances['instances']]
 
+    def get_default_configuration(self):
+        return instances.Instance(None, self.fake_default_config)
+
 
 class FakeConfigurationParameters(object):
     fake_config_param = (fakes.FakeHTTPClient().

troveclient/tests/osc/v1/test_database_configurations.py

@@ -323,3 +323,31 @@ class TestConfigurationInstancesList(TestConfigurations):
         columns, data = self.cmd.take_action(parsed_args)
         self.assertEqual(self.columns, columns)
         self.assertEqual(self.values, data)
+
+
+class TestConfigurationDefault(TestConfigurations):
+
+    values = ('2', '98', '1', '15M')
+
+    def setUp(self):
+        super(TestConfigurationDefault, self).setUp()
+        self.cmd = database_configurations.DefaultDatabaseConfiguration(
+            self.app, None)
+        self.data = (
+            self.fake_configurations.get_default_configuration())
+        self.instance_client.configuration.return_value = self.data
+        self.columns = (
+            'innodb_log_files_in_group',
+            'max_user_connections',
+            'skip-external-locking',
+            'tmp_table_size',
+        )
+
+    @mock.patch.object(utils, 'find_resource')
+    def test_default_database_configuration(self, mock_find):
+        args = ['1234']
+        mock_find.return_value = args[0]
+        parsed_args = self.check_parser(self.cmd, args, [])
+        columns, data = self.cmd.take_action(parsed_args)
+        self.assertEqual(self.columns, columns)
+        self.assertEqual(self.values, data)