Check external resources after creation

The method Resource.check() is not a generator function, but it does
return a generator in most cases. Simply calling the function does not
cause the resource to actually be checked. Only in the case where the
resource did not provide a handle_check() method would it do anything at
all - and in that case it simply changes the state to CHECK_COMPLETE.

Yield the generator function so that the resource will actually be
checked if the resource type supports it.

Change-Id: I2a78b6f6235529a95838307e3d38731d31ff5c4b
Task: 37828

heat/engine/resource.py

@@ -1206,7 +1206,7 @@ class Resource(status.ResourceStatus):
             yield self._do_action(self.ADOPT,
                                   resource_data={
                                       'resource_id': self.external_id})
-            self.check()
+            yield self.check()
             return
 
         # This method can be called when we replace a resource, too. In that

heat/tests/generic_resource.py

@@ -60,6 +60,12 @@ class GenericResource(resource.Resource):
                     self.type())
 
 
+class CheckableResource(GenericResource):
+    def handle_check(self):
+        LOG.warning(('Checking generic resource (Type "%s")'),
+                    self.type())
+
+
 class CancellableResource(GenericResource):
     def check_create_complete(self, cookie):
         return True

heat/tests/test_resource.py

@@ -366,6 +366,15 @@ class ResourceTest(common.HeatTestCase):
         self.assertEqual((res.CHECK, res.COMPLETE), res.state)
         self.assertEqual('f00d', res.resource_id)
 
+    def test_create_from_external_with_check(self):
+        tmpl = rsrc_defn.ResourceDefinition(
+            'test_resource', 'GenericResourceType',
+            external_id='f00d')
+        res = generic_rsrc.CheckableResource('test_resource', tmpl, self.stack)
+        scheduler.TaskRunner(res.create)()
+        self.assertEqual((res.CHECK, res.COMPLETE), res.state)
+        self.assertEqual('f00d', res.resource_id)
+
     def test_create_from_external_not_found(self):
         external_id = 'f00d'
         tmpl = rsrc_defn.ResourceDefinition(