Add OpenstackClient plugin for cluster policy show

This change implements the "openstack cluster policy show" command
  Based on the existing senlin command: senlin policy-show

Change-Id: I2f650d1c101ed7317a25fdaca8a025683e8bb4ea
Blueprint: senlin-support-python-openstackclient

senlinclient/osc/v1/policy.py

@@ -15,6 +15,9 @@
 import logging
 
 from cliff import lister
+from cliff import show
+from openstack import exceptions as sdk_exc
+from openstackclient.common import exceptions as exc
 from openstackclient.common import utils
 
 from senlinclient.common.i18n import _
@@ -97,3 +100,49 @@ class ListPolicy(lister.Lister):
             (utils.get_item_properties(p, columns, formatters=formatters)
              for p in policies)
         )
+
+
+class ShowPolicy(show.ShowOne):
+    """Show the policy details."""
+
+    log = logging.getLogger(__name__ + ".ShowPolicy")
+
+    def get_parser(self, prog_name):
+        parser = super(ShowPolicy, self).get_parser(prog_name)
+        parser.add_argument(
+            'policy',
+            metavar='<policy>',
+            help=_('Name or Id of the policy to show')
+        )
+        return parser
+
+    def take_action(self, parsed_args):
+        self.log.debug("take_action(%s)", parsed_args)
+
+        senlin_client = self.app.client_manager.clustering
+        return _show_policy(senlin_client, policy_id=parsed_args.policy)
+
+
+def _show_policy(senlin_client, policy_id):
+    try:
+        policy = senlin_client.get_policy(policy_id)
+    except sdk_exc.ResourceNotFound:
+        raise exc.CommandError(_('Policy not found: %s') % policy_id)
+
+    formatters = {
+        'spec': senlin_utils.json_formatter
+    }
+    columns = [
+        'created_at',
+        'data',
+        'domain',
+        'id',
+        'name',
+        'project',
+        'spec',
+        'type',
+        'updated_at',
+        'user'
+    ]
+    return columns, utils.get_dict_properties(policy.to_dict(), columns,
+                                              formatters=formatters)

senlinclient/tests/unit/osc/v1/test_policy.py

@@ -15,6 +15,7 @@ import mock
 
 from openstack.cluster.v1 import policy as sdk_policy
 from openstack import exceptions as sdk_exc
+from openstackclient.common import exceptions as exc
 
 from senlinclient.osc.v1 import policy as osc_policy
 from senlinclient.tests.unit.osc.v1 import fakes
@@ -136,3 +137,48 @@ class TestPolicyList(TestPolicy):
         columns, data = self.cmd.take_action(parsed_args)
         self.mock_client.policies.assert_called_with(**kwargs)
         self.assertEqual(self.columns, columns)
+
+
+class TestPolicyShow(TestPolicy):
+    get_response = {"policy": {
+        "created_at": "2015-03-02T07:40:31",
+        "data": {},
+        "domain": 'null',
+        "id": "02f62195-2198-4797-b0a9-877632208527",
+        "name": "sp001",
+        "project": "42d9e9663331431f97b75e25136307ff",
+        "spec": {
+            "properties": {
+                "adjustment": {
+                    "best_effort": True,
+                    "min_step": 1,
+                    "number": 1,
+                    "type": "CHANGE_IN_CAPACITY"
+                },
+                "event": "CLUSTER_SCALE_IN"
+            },
+            "type": "senlin.policy.scaling",
+            "version": "1.0"
+        },
+        "type": "senlin.policy.scaling-1.0",
+        "updated_at": 'null',
+        "user": "5e5bf8027826429c96af157f68dc9072"
+    }}
+
+    def setUp(self):
+        super(TestPolicyShow, self).setUp()
+        self.cmd = osc_policy.ShowPolicy(self.app, None)
+        self.mock_client.get_policy = mock.Mock(
+            return_value=sdk_policy.Policy(None, self.get_response))
+
+    def test_policy_show(self):
+        arglist = ['sp001']
+        parsed_args = self.check_parser(self.cmd, arglist, [])
+        self.cmd.take_action(parsed_args)
+        self.mock_client.get_policy.assert_called_with('sp001')
+
+    def test_policy_show_not_found(self):
+        arglist = ['sp001']
+        parsed_args = self.check_parser(self.cmd, arglist, [])
+        self.mock_client.get_policy.side_effect = sdk_exc.ResourceNotFound()
+        self.assertRaises(exc.CommandError, self.cmd.take_action, parsed_args)

setup.cfg

@@ -36,6 +36,7 @@ openstack.clustering.v1 =
     cluster_node_show = senlinclient.osc.v1.node:ShowNode
     cluster_node_update = senlinclient.osc.v1.node:UpdateNode
     cluster_policy_list = senlinclient.osc.v1.policy:ListPolicy
+    cluster_policy_show = senlinclient.osc.v1.policy:ShowPolicy
     cluster_profile_create = senlinclient.osc.v1.profile:CreateProfile
     cluster_profile_delete = senlinclient.osc.v1.profile:DeleteProfile
     cluster_profile_list = senlinclient.osc.v1.profile:ListProfile