If task fails on timeout - there is no clear message of failure

* Adding state_info to fail_task_if_incomplete solve it
 * Unskip test TaskDefaultsReverseWorkflowEngineTest#test_task_defaults_timeout_policy

Closes-Bug: #1527976
Change-Id: I1f44f648ea71d2dcf8bdca77e6bcca0023963be0

mistral/engine/default_engine.py

@@ -148,7 +148,7 @@ class DefaultEngine(base.Engine, coordination.Service):
                     output=output
                 )
 
-    def on_task_state_change(self, task_ex_id, state):
+    def on_task_state_change(self, task_ex_id, state, state_info=None):
         with db_api.transaction():
             task_ex = db_api.get_task_execution(task_ex_id)
             # TODO(rakhmerov): The method is mostly needed for policy and
@@ -160,11 +160,12 @@ class DefaultEngine(base.Engine, coordination.Service):
 
             wf_trace.info(
                 task_ex,
-                "Task '%s' [%s -> %s]"
-                % (task_ex.name, task_ex.state, state)
+                "Task '%s' [%s -> %s] state_info : %s"
+                % (task_ex.name, task_ex.state, state, state_info)
             )
 
             task_ex.state = state
+            task_ex.state_info = state_info
 
             self._on_task_state_change(task_ex, wf_ex)
 

mistral/engine/policies.py

@@ -439,5 +439,6 @@ def fail_task_if_incomplete(task_ex_id, timeout):
 
         rpc.get_engine_client().on_task_state_change(
             task_ex_id,
-            states.ERROR
+            states.ERROR,
+            msg
         )

mistral/engine/rpc.py

@@ -122,8 +122,9 @@ class EngineServer(object):
             **params
         )
 
-    def on_task_state_change(self, rpc_ctx, task_ex_id, state):
-        return self._engine.on_task_state_change(task_ex_id, state)
+    def on_task_state_change(self, rpc_ctx, task_ex_id, state,
+                             state_info=None):
+        return self._engine.on_task_state_change(task_ex_id, state, state_info)
 
     def on_action_complete(self, rpc_ctx, action_ex_id, result_data,
                            result_error):
@@ -308,12 +309,13 @@ class EngineClient(base.Engine):
             params=params
         )
 
-    def on_task_state_change(self, task_ex_id, state):
+    def on_task_state_change(self, task_ex_id, state, state_info=None):
         return self._client.call(
             auth_ctx.ctx(),
             'on_task_state_change',
             task_ex_id=task_ex_id,
-            state=state
+            state=state,
+            state_info=state_info
         )
 
     @wrap_messaging_exception

mistral/tests/unit/engine/test_task_defaults.py

@@ -15,7 +15,6 @@
 import datetime as dt
 from oslo_config import cfg
 from oslo_log import log as logging
-import testtools
 
 from mistral.db.v2 import api as db_api
 from mistral.services import scheduler
@@ -129,7 +128,6 @@ class TaskDefaultsReverseWorkflowEngineTest(base.EngineTestCase):
             task1.runtime_context['retry_task_policy']['retry_no'] > 0
         )
 
-    @testtools.skip("Fix 'timeout' policy.")
     def test_task_defaults_timeout_policy(self):
         wf_text = """---
         version: '2.0'
@@ -165,6 +163,9 @@ class TaskDefaultsReverseWorkflowEngineTest(base.EngineTestCase):
 
         self._assert_single_item(tasks, name='task1', state=states.ERROR)
 
+        task_ex = db_api.get_task_execution(tasks[0].id)
+        self.assertIn("Task timed out", task_ex.state_info)
+
     def test_task_defaults_wait_policies(self):
         wf_text = """---
         version: '2.0'