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Enhance Watcher Applier Engine

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Add a new config option 'action_execution_rule' which is a dict type.
Its key field is strategy name and the value is 'ALWAYS' or 'ANY'.
'ALWAYS' means the callback function returns True as usual.
'ANY' means the return depends on the result of previous action
execution. The callback returns True if previous action gets failed,
and the engine continues to run the next action. If previous action
executes success, the callback returns False then the next action
will be ignored.
For strategies that aren't in 'action_execution_rule', the callback
always returns True.

If exception is throwing out during the action execution, reverting will
be triggered by taskflow. To continue executing the next action,
we return False instead of throwing an exception.

Change-Id: Ib5afa214d8d097d739aad35d18b3fe5c8e4de8fc
Implements: blueprint enhance-watcher-applier-engine
This commit is contained in:
licanwei
2018-03-20 19:52:00 -07:00
parent e8c08e2abb
commit 69cf0d3ee5
6 changed files with 120 additions and 24 deletions
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18
doc/source/architecture.rst
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@@ -76,6 +76,7 @@ Watcher Applier
This component is in charge of executing the
:ref:`Action Plan <action_plan_definition>` built by the
:ref:`Watcher Decision Engine <watcher_decision_engine_definition>`.
Taskflow is the default workflow engine for Watcher.
It connects to the :ref:`message bus <amqp_bus_definition>` and launches the
:ref:`Action Plan <action_plan_definition>` whenever a triggering message is
@@ -110,6 +111,23 @@ If the :ref:`Action <action_definition>` fails, the
previous state of the :ref:`Managed resource <managed_resource_definition>`
(i.e. before the command was sent to the underlying OpenStack service).
In Stein, added a new config option 'action_execution_rule' which is a
dict type. Its key field is strategy name and the value is 'ALWAYS' or 'ANY'.
'ALWAYS' means the callback function returns True as usual.
'ANY' means the return depends on the result of previous action execution.
The callback returns True if previous action gets failed, and the engine
continues to run the next action. If previous action executes success,
the callback returns False then the next action will be ignored.
For strategies that aren't in 'action_execution_rule', the callback always
returns True.
Please add the next section in the watcher.conf file
if your strategy needs this feature.
::
[watcher_workflow_engines.taskflow]
action_execution_rule = {'your strategy name': 'ANY'}
.. _archi_watcher_cli_definition:
Watcher CLI