Handle 404 on Zaqar Queue delete

Change-Id: Iacff8adadc59693e9f8e4132f369bf08956affe3
Closes-Bug: 1404375

contrib/heat_zaqar/heat_zaqar/client.py

@@ -18,14 +18,18 @@ LOG = logging.getLogger(__name__)
 
 try:
     from zaqarclient.queues.v1 import client as zaqarclient
+    from zaqarclient.transport import errors as zaqar_errors
 except ImportError:
     zaqarclient = None
+    zaqar_errors = None
 
 from heat.engine.clients import client_plugin
 
 
 class ZaqarClientPlugin(client_plugin.ClientPlugin):
 
+    exception_module = zaqar_errors
+
     def _create(self):
 
         con = self.context
@@ -47,3 +51,6 @@ class ZaqarClientPlugin(client_plugin.ClientPlugin):
         client = zaqarclient.Client(url=endpoint, conf=conf)
 
         return client
+
+    def is_not_found(self, ex):
+        return isinstance(ex, zaqar_errors.ResourceNotFound)

contrib/heat_zaqar/heat_zaqar/resources/queue.py

@@ -104,9 +104,12 @@ class ZaqarQueue(resource.Resource):
         """Delete a zaqar message queue."""
         if not self.resource_id:
             return
-
-        queue = self.client().queue(self.resource_id, auto_create=False)
-        queue.delete()
+        try:
+            queue = self.client().queue(self.resource_id, auto_create=False)
+        except Exception as exc:
+            self.client_plugin().ignore_not_found(exc)
+        else:
+            queue.delete()
 
     def href(self):
         api_endpoint = self.client().api_url

contrib/heat_zaqar/heat_zaqar/tests/test_queue.py

@@ -11,12 +11,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import mock
 import six
 
 from heat.common import exception
 from heat.common import template_format
 from heat.engine import parser
 from heat.engine import resource
+from heat.engine import rsrc_defn
 from heat.engine import scheduler
 from heat.engine import template
 from heat.tests import common
@@ -24,6 +26,11 @@ from heat.tests import utils
 
 from ..resources import queue  # noqa
 
+try:
+    from zaqarclient.transport.errors import ResourceNotFound  # noqa
+except ImportError:
+    ResourceNotFound = Exception
+
 wp_template = '''
 {
   "AWSTemplateFormatVersion" : "2010-09-09",
@@ -183,6 +190,25 @@ class ZaqarMessageQueueTest(common.HeatTestCase):
         scheduler.TaskRunner(queue.delete)()
         self.m.VerifyAll()
 
+    @mock.patch.object(queue.ZaqarQueue, "client")
+    @mock.patch.object(queue.ZaqarQueue, "client_plugin")
+    def test_delete_not_found(self, mockplugin, mockclient):
+
+        mock_def = mock.Mock(spec=rsrc_defn.ResourceDefinition)
+        mock_stack = mock.Mock()
+        mock_stack.db_resource_get.return_value = None
+
+        mockclient.return_value.queue.side_effect = ResourceNotFound
+        mockplugin.return_value.ignore_not_found.return_value = None
+        zplugin = queue.ZaqarQueue("test_delete_not_found", mock_def,
+                                   mock_stack)
+        zplugin.resource_id = "test_delete_not_found"
+        zplugin.handle_delete()
+        mockclient.return_value.queue.assert_called_once_with(
+            "test_delete_not_found", auto_create=False)
+        mockplugin.return_value.ignore_not_found.assert_called_once_with(
+            mock.ANY)
+
     def test_update_in_place(self):
         t = template_format.parse(wp_template)
         self.parse_stack(t)