Move implementation_signature to StackResource

We need to use common logic for the update determination which
uses implementation_signature, so move the common code from
TemplateResource to the StackResource base-class.

Change-Id: Ibd64b3607721487be5b0562cdb54e6c76db51149
Partial-Bug: #1389499

heat/engine/resources/template_resource.py

@@ -11,7 +11,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import hashlib
 import json
 
 from requests import exceptions
@@ -147,11 +146,7 @@ class TemplateResource(stack_resource.StackResource):
 
     def implementation_signature(self):
         self._generate_schema(self.t)
-        schema_names = ([prop for prop in self.properties_schema] +
-                        [at for at in self.attributes_schema])
-        schema_hash = hashlib.sha1(';'.join(schema_names))
-        templ_hash = hashlib.sha1(self.template_data())
-        return (schema_hash.hexdigest(), templ_hash.hexdigest())
+        return super(TemplateResource, self).implementation_signature()
 
     def template_data(self):
         # we want to have the latest possible template.

heat/engine/stack_resource.py

@@ -11,7 +11,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import hashlib
+
 from oslo.config import cfg
+from oslo.serialization import jsonutils
 
 from heat.common import exception
 from heat.common.i18n import _
@@ -349,3 +352,10 @@ class StackResource(resource.Resource):
 
     def _resolve_attribute(self, name):
         return self.get_output(name)
+
+    def implementation_signature(self):
+        schema_names = ([prop for prop in self.properties_schema] +
+                        [at for at in self.attributes_schema])
+        schema_hash = hashlib.sha1(';'.join(schema_names))
+        templ_hash = hashlib.sha1(jsonutils.dumps(self.child_template()))
+        return (schema_hash.hexdigest(), templ_hash.hexdigest())

heat/tests/test_stack_resource.py

@@ -135,6 +135,13 @@ class StackResourceTest(common.HeatTestCase):
         preview = self.parent_resource.preview()
         self.assertIsInstance(preview, stack_resource.StackResource)
 
+    def test_implementation_signature(self):
+        self.parent_resource.child_template = mock.Mock(
+            return_value=self.simple_template)
+        sig1, sig2 = self.parent_resource.implementation_signature()
+        self.assertEqual('3700dc2ae6ff4f0a236e7477ad6b8d51157f2153', sig1)
+        self.assertEqual('efe1707e1bd7dda17b9e995d8a8cf3c057119c96', sig2)
+
     def test_propagated_files(self):
         self.parent_stack.t.files["foo"] = "bar"
         self.parent_resource.create_with_template(self.templ,