Adding callback url to action context

* Callback URL is now provided by std.mistral_http
 action to easy understand where the result should be sent

Closes-Bug: #1500833

Change-Id: I347edc5848bde4262a2d57f1787db5f16e218f0a
(cherry picked from commit dde634d8b9)

mistral/actions/std_actions.py

@@ -242,6 +242,7 @@ class MistralHTTPAction(HTTPAction):
             'Mistral-Workflow-Execution-Id': actx.get('workflow_execution_id'),
             'Mistral-Task-Id': actx.get('task_id'),
             'Mistral-Action-Execution-Id': actx.get('action_execution_id'),
+            'Mistral-Callback-URL': actx.get('callback_url'),
         })
 
         super(MistralHTTPAction, self).__init__(

mistral/services/action_manager.py

@@ -156,7 +156,8 @@ def get_action_context(task_ex, action_ex_id):
             'task_id': task_ex.id,
             'task_name': task_ex.name,
             'task_tags': task_ex.tags,
-            'action_execution_id': action_ex_id
+            'action_execution_id': action_ex_id,
+            'callback_url': '/v2/action_executions/%s' % action_ex_id
         }
     }
 

mistral/tests/unit/engine/test_action_context.py

@@ -77,7 +77,8 @@ class ActionContextTest(base.EngineTestCase):
             'Mistral-Workflow-Name': wf_ex.workflow_name,
             'Mistral-Workflow-Execution-Id': wf_ex.id,
             'Mistral-Task-Id': task_ex.id,
-            'Mistral-Action-Execution-Id': action_ex.id
+            'Mistral-Action-Execution-Id': action_ex.id,
+            'Mistral-Callback-URL': '/v2/action_executions/%s' % action_ex.id
         }
 
         requests.request.assert_called_with(