Allow multiple required_service_extension

In some cases, some resources may require more than
one service_extension. In this case, we should allow
resources to define a list of required resources.

Change-Id: Iee0104a741cc050047824d23b8ab5ee9871c4f28

heat/engine/resource.py

@@ -16,6 +16,7 @@ import contextlib
 import datetime as dt
 import itertools
 import pydoc
+import re
 import tenacity
 import weakref
 
@@ -807,16 +808,21 @@ class Resource(status.ResourceStatus):
                 service_name=cls.default_client_name)
             if endpoint_exists:
                 req_extension = cls.required_service_extension
-                is_ext_available = (
-                    not req_extension or client_plugin.has_extension(
-                        req_extension))
+                if not req_extension:
+                    return(True, None)
+                if isinstance(req_extension, str):
+                    req_extension = re.split(' |,', req_extension)
+                for ext in req_extension:
+                    is_ext_available = (
+                        client_plugin.has_extension(ext))
+                    if not is_ext_available:
+                        reason = _('Required extension {0} in {1} service '
+                                   'is not available.')
+                        reason = reason.format(ext,
+                                               cls.default_client_name)
+                        break
                 if is_ext_available:
                     return (True, None)
-                else:
-                    reason = _('Required extension {0} in {1} service '
-                               'is not available.')
-                    reason = reason.format(req_extension,
-                                           cls.default_client_name)
             else:
                 reason = _('{0} {1} endpoint is not in service catalog.')
                 reason = reason.format(cls.default_client_name, service_type)

heat/tests/generic_resource.py

@@ -317,6 +317,20 @@ class ResourceWithDefaultClientNameExt(resource.Resource):
     properties_schema = {}
 
 
+class ResourceWithDefaultClientNameMultiStrExt(resource.Resource):
+    default_client_name = 'sample'
+    required_service_extension = 'foo,bar'
+
+    properties_schema = {}
+
+
+class ResourceWithDefaultClientNameMultiExt(resource.Resource):
+    default_client_name = 'sample'
+    required_service_extension = ['foo', 'bar']
+
+    properties_schema = {}
+
+
 class ResourceWithFnGetAttType(GenericResource):
     def get_attribute(self, name):
         pass

heat/tests/test_resource.py

@@ -4064,6 +4064,84 @@ class ResourceAvailabilityTest(common.HeatTestCase):
 
         self.assertRaises(MyException, res.handle_delete)
 
+    @mock.patch.object(clients.OpenStackClients, 'client_plugin')
+    def test_service_deployed_required_extension_true_string(
+            self,
+            mock_client_plugin_method):
+        """Test availability of resource with a required extension. """
+
+        mock_service_types, mock_client_plugin = self._mock_client_plugin(
+            ['test_type']
+        )
+        mock_client_plugin.has_extension = mock.Mock(
+            side_effect=[True, True])
+        mock_client_plugin_method.return_value = mock_client_plugin
+
+        rsrc = generic_rsrc.ResourceWithDefaultClientNameMultiStrExt
+        rsrc.is_service_available(
+            context=mock.Mock())[0]
+        mock_client_plugin_method.assert_called_once_with(
+            generic_rsrc.ResourceWithDefaultClientName.default_client_name)
+        mock_service_types.assert_called_once_with()
+        mock_client_plugin.does_endpoint_exist.assert_called_once_with(
+            service_type='test_type',
+            service_name=(generic_rsrc.ResourceWithDefaultClientName
+                          .default_client_name))
+        mock_client_plugin.has_extension.has_calls(
+            [('foo'), ('bar')])
+
+    @mock.patch.object(clients.OpenStackClients, 'client_plugin')
+    def test_service_deployed_required_extension_true_list(
+            self,
+            mock_client_plugin_method):
+        """Test availability of resource with a required extension. """
+
+        mock_service_types, mock_client_plugin = self._mock_client_plugin(
+            ['test_type']
+        )
+        mock_client_plugin.has_extension = mock.Mock(
+            side_effect=[True, True])
+        mock_client_plugin_method.return_value = mock_client_plugin
+
+        rsrc = generic_rsrc.ResourceWithDefaultClientNameMultiExt
+        rsrc.is_service_available(
+            context=mock.Mock())[0]
+        mock_client_plugin_method.assert_called_once_with(
+            generic_rsrc.ResourceWithDefaultClientName.default_client_name)
+        mock_service_types.assert_called_once_with()
+        mock_client_plugin.does_endpoint_exist.assert_called_once_with(
+            service_type='test_type',
+            service_name=(generic_rsrc.ResourceWithDefaultClientName
+                          .default_client_name))
+        mock_client_plugin.has_extension.has_calls(
+            [('foo'), ('bar')])
+
+    @mock.patch.object(clients.OpenStackClients, 'client_plugin')
+    def test_service_deployed_required_extension_true_list_fail(
+            self,
+            mock_client_plugin_method):
+        """Test availability of resource with a required extension. """
+
+        mock_service_types, mock_client_plugin = self._mock_client_plugin(
+            ['test_type']
+        )
+        mock_client_plugin.has_extension = mock.Mock(
+            side_effect=[True, False])
+        mock_client_plugin_method.return_value = mock_client_plugin
+
+        rsrc = generic_rsrc.ResourceWithDefaultClientNameMultiExt
+        self.assertFalse(rsrc.is_service_available(
+            context=mock.Mock())[0])
+        mock_client_plugin_method.assert_called_once_with(
+            generic_rsrc.ResourceWithDefaultClientName.default_client_name)
+        mock_service_types.assert_called_once_with()
+        mock_client_plugin.does_endpoint_exist.assert_called_once_with(
+            service_type='test_type',
+            service_name=(generic_rsrc.ResourceWithDefaultClientName
+                          .default_client_name))
+        mock_client_plugin.has_extension.has_calls(
+            [('foo'), ('bar')])
+
 
 class TestLiveStateUpdate(common.HeatTestCase):
 

releasenotes/notes/support-multiple-required-extensions-277560a90308e17c.yaml

@@ -0,0 +1,6 @@
+---
+other:
+  - |
+    Allow Heat resources to accept more than one required_service_extension.
+    For cases where a resource required multiple service extensions. A
+    developer can now provide a list of those extensions.