network.common.NetworkAndComputeShowOne: catch HttpException

Problem: if a user issue the cmd 'openstack floating ip create public'
and has already maxed his quota for FIP, OSC exits with a not so useful
message:

>jordan@jordan-XPS13-9333:~ $ openstack floating ip create public
>HttpException: Conflict

This patches catch the HttpException earlier and prints a more
verbose message:

> jordan@jordan-XPS13-9333:~ $ openstack floating ip create public
> Error while executing command: Quota exceeded for resources: ['floatingip']

Change-Id: I7c87524d871d230d92f007c32e06439b34c7194a

openstackclient/network/common.py

@@ -14,6 +14,7 @@
 import abc
 import logging
 
+import openstack.exceptions
 from osc_lib.command import command
 from osc_lib import exceptions
 import six
@@ -181,12 +182,16 @@ class NetworkAndComputeShowOne(command.ShowOne):
     """
 
     def take_action(self, parsed_args):
+        try:
             if self.app.client_manager.is_network_endpoint_enabled():
-            return self.take_action_network(self.app.client_manager.network,
-                                            parsed_args)
+                return self.take_action_network(
+                    self.app.client_manager.network, parsed_args)
             else:
-            return self.take_action_compute(self.app.client_manager.compute,
-                                            parsed_args)
+                return self.take_action_compute(
+                    self.app.client_manager.compute, parsed_args)
+        except openstack.exceptions.HttpException as exc:
+            msg = _("Error while executing command: %s") % exc.message
+            raise exceptions.CommandError(msg)
 
     def get_parser(self, prog_name):
         LOG.debug('get_parser(%s)', prog_name)

openstackclient/tests/unit/network/test_common.py

@@ -14,6 +14,8 @@
 import argparse
 import mock
 
+import openstack
+from openstackclient.common import exceptions
 from openstackclient.network import common
 from openstackclient.tests.unit import utils
 
@@ -172,3 +174,15 @@ class TestNetworkAndComputeShowOne(TestNetworkAndCompute):
     def setUp(self):
         super(TestNetworkAndComputeShowOne, self).setUp()
         self.cmd = FakeNetworkAndComputeShowOne(self.app, self.namespace)
+
+    def test_take_action_with_http_exception(self):
+        with mock.patch.object(self.cmd, 'take_action_network') as m_action:
+            m_action.side_effect = openstack.exceptions.HttpException("bar")
+            self.assertRaisesRegex(exceptions.CommandError, "bar",
+                                   self.cmd.take_action, mock.Mock())
+
+        self.app.client_manager.network_endpoint_enabled = False
+        with mock.patch.object(self.cmd, 'take_action_compute') as m_action:
+            m_action.side_effect = openstack.exceptions.HttpException("bar")
+            self.assertRaisesRegex(exceptions.CommandError, "bar",
+                                   self.cmd.take_action, mock.Mock())