Mierdin
commented
7 years ago A great place to get more information about Mistral workflows is with the mistral CLI:
vagrant@st2vagrant:/opt/stackstorm/packs/napalm$ mistral execution-list
+--------------------+--------------------+--------------------+-------------+-------------------+---------+--------------------+--------------------+---------------------+
| ID | Workflow ID | Workflow name | Description | Task Execution ID | State | State info | Created at | Updated at |
+--------------------+--------------------+--------------------+-------------+-------------------+---------+--------------------+--------------------+---------------------+
| da3e9301-0908-4c12 | df80f778-eaae- | examples.mistral- | | <none> | SUCCESS | None | 2017-07-06 | 2017-07-06 06:15:02 |
| -996c-126fde664226 | 469f- | basic | | | | | 06:15:01 | |
| | 8db9-c3af01cfd3d4 | | | | | | | |
| 75511a68-e014-4493 | df80f778-eaae- | examples.mistral- | | <none> | ERROR | Failed to handle | 2017-07-06 | 2017-07-06 06:16:20 |
| -9ac4-e122e43987b7 | 469f- | basic | | | | action c... | 06:16:20 | |
| | 8db9-c3af01cfd3d4 | | | | | | | |
+--------------------+--------------------+--------------------+-------------+-------------------+---------+--------------------+--------------------+---------------------+
vagrant@st2vagrant:/opt/stackstorm/packs/napalm$ mistral execution-get 75511a68-e014-4493-9ac4-e122e43987b7
+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ID | 75511a68-e014-4493-9ac4-e122e43987b7 |
| Workflow ID | df80f778-eaae-469f-8db9-c3af01cfd3d4 |
| Workflow name | examples.mistral-basic |
| Description | |
| Task Execution ID | <none> |
| State | ERROR |
| State info | Failed to handle action completion [error=Can not evaluate Jinja expression [expression= task(task1).result.stdout , error='task1' is undefined, data={}], |
| | wf=examples.mistral-basic, task=task1, action=st2.action]: |
| | Traceback (most recent call last): |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/engine/task_handler.py", line 105, in _on_action_complete |
| | task.on_action_complete(action_ex) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/osprofiler/profiler.py", line 153, in wrapper |
| | return f(*args, **kwargs) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/engine/tasks.py", line 264, in on_action_complete |
| | self.complete(state, state_info) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/osprofiler/profiler.py", line 153, in wrapper |
| | return f(*args, **kwargs) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/engine/tasks.py", line 163, in complete |
| | data_flow.publish_variables(self.task_ex, self.task_spec) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/workflow/data_flow.py", line 211, in publish_variables |
| | task_ex.published = expr.evaluate_recursively(data, expr_ctx) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/expressions/__init__.py", line 96, in evaluate_recursively |
| | data[key] = _evaluate_item(data[key], context) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/expressions/__init__.py", line 79, in _evaluate_item |
| | return evaluate(item, context) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/expressions/__init__.py", line 71, in evaluate |
| | return evaluator.evaluate(expression, context) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/expressions/jinja_expression.py", line 140, in evaluate |
| | result = JinjaEvaluator.evaluate(patterns[0][1], data_context) |
| | File "/opt/stackstorm/mistral/local/lib/python2.7/site-packages/mistral/expressions/jinja_expression.py", line 89, in evaluate |
| | ", data=%s]" % (expression, str(e), data_context) |
| | JinjaEvaluationException: Can not evaluate Jinja expression [expression= task(task1).result.stdout , error='task1' is undefined, data={}] |
| | |
| Created at | 2017-07-06 06:16:20 |
| Updated at | 2017-07-06 06:16:20 |
+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------+The reason for this error is because when referencing tasks in a Jinja snippet, they must be quoted. This is explained in the Jinja + Mistral doc:
Unlike YAQL, a string in a Jinja expression must be explicitly encapsulated in quotes
So since I changed this to use Jinja instead of YAQL, a correct version of the line in question would be:
stdout: "{{ task('task1').result.stdout }}"
I was tinkering with
mistral-basicworkflow in theexamplespack, and converted some of it to use Jinja instead of YAQL. After running it, however, I noticed that - while my action execution succeeded, the workflow itself returned a failure: