0134543625
There are many references to review.openstack.org, and while the redirect should work, we can also go ahead and fix them. Change-Id: Ic8030eb290f08b3ac982618387b19f6a84479034
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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=======================================
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Support Description For Dynamic Action
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=======================================
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https://blueprints.launchpad.net/watcher/+spec/dynamic-action-description
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Add description property for dynamic action. Admin can see detail information
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of any specify action.
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Problem description
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===================
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Currently, a cloud admin has no way to see the description of planned actions
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before running an action plan. This literal description is important when the
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cloud admin wants to see detailed information about a recommended action plan.
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Use Cases
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---------
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As a cloud administrator, I want to be able to see the description of
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planned actions before running an action plan.
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Proposed change
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===============
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Allow RESTful API(GET /v1/actions/(action_uuid)) to get description information
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of a specified action.
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- Define a mapping of action_type and description
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+ action_type: 'migrate'
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description: 'Moving a VM instance from source_node to destination_node'
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+ action_type: 'change_nova_service_state'
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description: 'Disables or enables the nova-compute service.
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A disabled nova-compute service can not be selected
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by the nova for future deployment of new server.'
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+ action_type: 'resize'
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description: 'Resize a server with specified flavor.'
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+ action_type: 'sleep'
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description: 'Wait for a given interval in seconds.'
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+ action_type: 'nop'
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description: 'Logging a NOP message'
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- Add a new table to save the mapping
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+ This table includes action_type and action description.
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- Show description of a specified action
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+ Add the logic of computing action_description to "get_one" method in
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watcher/api/controllers/v1/action.py
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Alternatives
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------------
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- Implement 2 notifications:
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In order to share the description of all the action plugins installed
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alongside the Applier so that we wouldn't need to also install these plugins
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on the API side
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+ the 1st one the API side that requests the action descriptions and the 2nd
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one on the Applier side that emits all the actions, including their
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descriptions (both notifications will have to be versioned).
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+ The latter will also have to be emitted upon starting the Applier to notify
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the API of any change of description.
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**action_info.request**
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.. code-block:: json
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{
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"priority": "INFO",
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"payload": {
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"watcher_object.namespace": "watcher",
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"watcher_object.version": "1.0",
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"watcher_object.name": "ActionInfoPayload",
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"watcher_object.data": {
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"description": "moving a VM instance",
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"action_type": "migrate",
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},
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},
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"publisher_id": "infra-optim:localhost",
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"timestamp": "2017-01-04 16:31:36.264673",
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"event_type": "action_info.request",
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"message_id": "cbcf9f2c-7c53-4b4d-91ec-db49cca024b6"
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}
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**action_info.emit**
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.. code-block:: json
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{
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"priority": "INFO",
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"payload": {
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"watcher_object.namespace": "watcher"
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"watcher_object.version": "1.0",
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"watcher_object.name": "ActionInfoPayload",
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"watcher_object.data": {
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"action_type": "migrate",
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"description": "moving a VM instance",
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},
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},
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"publisher_id": "infra-optim:localhost",
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"timestamp": "2017-01-04 16:31:36.264673",
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"event_type": "action_info.emit",
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"message_id": "cbcf9f2c-7c53-4b4d-91ec-db49cca024b6"
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}
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The implementation is as follows:
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https://review.opendev.org/#/c/454638/
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But in my test, The number of received notifications is often less than
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the number of notifications sent.
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Data model impact
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-----------------
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Add a new table named 'action_descriptions'.
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This table includes action_type and action description.
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REST API impact
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---------------
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URLs with **/v1/actions/** and that uses the type **Action**:
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* GET /v1/actions/(action_uuid)
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* GET /v1/actions/detail
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There will be a new action description field in the REST URLs
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respond message.
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Security impact
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---------------
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None
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Notifications impact
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--------------------
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None
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Other end user impact
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---------------------
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Aside from the API, here are there other ways a user will interact with this
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feature:
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* impact on **python-watcherclient**:
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* Display the "description" field when displaying details about an action.
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Performance Impact
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------------------
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None
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Other deployer impact
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---------------------
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None
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Developer impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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licanwei, hanrong
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Work Items
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----------
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Add a new table to save the mapping
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Add logic to update the table when action loading
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Add logic to show the action description
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Dependencies
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============
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None
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Testing
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=======
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Unit tests should be updated.
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Documentation Impact
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====================
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The documentation will have to be updated, especially the glossary, in order to
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explain the new concepts regarding "action" definition.
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References
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==========
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https://docs.openstack.org/watcher/latest/#action
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https://docs.openstack.org/watcher/latest/#action-plan
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History
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=======
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None
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