drydock/docs/source/task.rst

Tasks

Tasks are requests for Drydock to perform an action asynchronously. Depending on the action being requested, tasks could take seconds to hours to complete. When a task is created, a identifier is generated and returned. That identifier can be used to poll the task API for task status and results.

Task Document Schema

This document can be posted to the Drydock task-api to create a new task.:

{
  "action": "validate_design|verify_site|prepare_site|verify_node|prepare_node|deploy_node|destroy_node",
  "design_ref": "http_uri|deckhand_uri|file_uri",
  "node_filter": {
    "filter_set_type": "intersection|union",
    "filter_set": [
      {
        "filter_type": "intersection|union",
        "node_names": [],
        "node_tags": [],
        "node_labels": {},
        "rack_names": [],
        "rack_labels": {},
      }
    ]
  }
}

The filter is computed by taking the set of all defined nodes. Each filter in the filter set is applied by either finding the union or intersection of filtering the full set of nodes by the attribute values specified. The result set of each filter is then combined as either an intersection or union with that result being the final set the task is executed against.

Assuming you have a node inventory of:

[
  {
    "name": "a",
    "labels": {
      "type": "physical",
      "color": "blue"
    }
  },
  {
    "name": "b",
    "labels": {
      "type": "virtual",
      "color": "yellow"
    }
  },
  {
    "name": "c",
    "labels": {
      "type": "physical",
      "color": "yellow"
    }
  }

Example:

"filter_set": [
  {
    "filter_type": "intersection",
    "node_labels": {
      "color": "yellow",
      "type": "physical"
    }
  },
  {
    "filter_type": "intersection",
    "node_names": ["a"]
  }
],
"filter_set_type": "union"

The above filter set results in a set a and c.

Task Status Schema

When querying the state of an existing task, the below document will be returned:

{
  "Kind": "Task",
  "apiVersion": "v1",
  "task_id": "uuid",
  "action": "validate_design|verify_site|prepare_site|verify_node|prepare_node|deploy_node|destroy_node",
  "design_ref": "http_uri|deckhand_uri|file_uri",
  "parent_task_id": "uuid",
  "subtask_id_list": ["uuid","uuid",...],
  "status": "requested|queued|running|terminating|complete|terminated",
  "node_filter": {
    "filter_set_type": "intersection|union",
    "filter_set": [
      {
        "filter_type": "intersection|union",
        "node_names": [],
        "node_tags": [],
        "node_labels": {},
        "rack_names": [],
        "rack_labels": {},
      }
    ]
  },
  "created": iso8601 UTC timestamp,
  "created_by": "user",
  "updated": iso8601 UTC timestamp,
  "terminated": iso8601 UTC timestamp,
  "terminated_by": "user",
  "result": Status object
}

The Status object is based on the UCP standardized response format:

{
  "Kind": "Status",
  "apiVersion": "v1",
  "metadata": {},
  "message": "Drydock Task ...",
  "reason": "Failure reason",
  "status": "failure|success|partial_success|incomplete",
  "details": {
    "errorCount": 0,
    "messageList": [
       StatusMessage
    ]
  }
}

The StatusMessage object will change based on the context of the message, but will at a minimum consist of the below:

{
  "message": "Textual description",
  "error": true|false,
  "context_type": "site|network|node",
  "context": "site_name|network_name|node_name",
  "ts": iso8601 UTC timestamp,
}