Fix an expression context for all_errors_handled()

* "__task_execution" wasn't included in this case into the
  expression data context so the function task() didn't work
  properly

Change-Id: I3cacae90f9031d09a5e6d8153d728ddc01e1bb21
Closes-Bug: #1823875

mistral/tests/unit/engine/test_yaql_functions.py

@@ -293,6 +293,34 @@ class YAQLFunctionsEngineTest(engine_test_base.EngineTestCase):
             self._assert_single_item(wf_ex.task_executions, name='task1')
             self._assert_single_item(wf_ex.task_executions, name='task2')
 
+    def test_task_function_no_name_when_calculating_end_tasks(self):
+        wf_text = """---
+            version: '2.0'
+
+            wf:
+              tasks:
+                task1:
+                  action: std.fail error_data="Some data"
+                  on-error:
+                    - task2: <% task().result != '' %>
+
+                task2:
+                  action: std.echo output=2
+        """
+
+        wf_service.create_workflows(wf_text)
+
+        wf_ex = self.engine.start_workflow('wf')
+
+        self.await_workflow_success(wf_ex.id)
+
+        with db_api.transaction():
+            wf_ex = db_api.get_workflow_execution(wf_ex.id)
+
+            self.assertEqual(2, len(wf_ex.task_executions))
+            self._assert_single_item(wf_ex.task_executions, name='task1')
+            self._assert_single_item(wf_ex.task_executions, name='task2')
+
     def test_uuid_function(self):
         wf_text = """---
             version: '2.0'

mistral/workflow/direct_workflow.py

@@ -198,6 +198,7 @@ class DirectWorkflowController(base.WorkflowController):
     def all_errors_handled(self):
         for t_ex in lookup_utils.find_error_task_executions(self.wf_ex.id):
             ctx_view = data_flow.ContextView(
+                data_flow.get_current_task_dict(t_ex),
                 data_flow.evaluate_task_outbound_context(t_ex),
                 data_flow.get_workflow_environment_dict(self.wf_ex),
                 self.wf_ex.context,
@@ -230,9 +231,7 @@ class DirectWorkflowController(base.WorkflowController):
         )
 
         for batch in batches:
-            yield list(
-                filter(is_end_task, batch)
-            )
+            yield list(filter(is_end_task, batch))
 
     def may_complete_workflow(self, task_ex):
         res = super(DirectWorkflowController, self).may_complete_workflow(

releasenotes/notes/fix_task_function-04b83ada20a71f12.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    "__task_execution" wasn't always included into the expression data
+    context so the function task() didn't work properly.
+    Fixes [`bug 1823875 <https://bugs.launchpad.net/mistral/+bug/1823875>`_]