Amazon EC2 Auto Scaling Set Desired Capacity and Verify

arazzo: 1.0.1
info:
  title: Amazon EC2 Auto Scaling Set Desired Capacity and Verify
  summary: Manually set a group's desired capacity, verify it took effect, and review the scaling activity.
  description: >-
    Manually resizes an Auto Scaling group and confirms the change. The workflow
    sets the desired capacity, describes the group and branches on whether the
    reported desired capacity already matches the requested value, and then
    describes recent scaling activities for the group so the triggered activity
    can be inspected. Every step spells out the AWS query-protocol Action and
    Version inline so the flow can be read and executed without opening the
    underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: autoScalingApi
  url: ../openapi/amazon-ec2-auto-scaling-openapi.yaml
  type: openapi
workflows:
- workflowId: set-desired-capacity-and-verify
  summary: Set the desired capacity of a group and confirm the resulting state and activity.
  description: >-
    Sets the group's desired capacity, describes the group to verify the new
    target, and lists recent scaling activities for the group.
  inputs:
    type: object
    required:
    - autoScalingGroupName
    - desiredCapacity
    properties:
      autoScalingGroupName:
        type: string
        description: The name of the Auto Scaling group to resize.
      desiredCapacity:
        type: integer
        description: The new desired capacity for the group.
      honorCooldown:
        type: boolean
        description: Whether to wait for the cooldown period before initiating the scaling activity.
  steps:
  - stepId: setDesiredCapacity
    description: >-
      Set the new desired capacity for the Auto Scaling group.
    operationId: POST_SetDesiredCapacity
    parameters:
    - name: Action
      in: query
      value: SetDesiredCapacity
    - name: Version
      in: query
      value: 2011-01-01
    requestBody:
      contentType: text/xml
      payload:
        AutoScalingGroupName: $inputs.autoScalingGroupName
        DesiredCapacity: $inputs.desiredCapacity
        HonorCooldown: $inputs.honorCooldown
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      setStatus: $statusCode
  - stepId: describeGroupCapacity
    description: >-
      Describe the group and branch on whether the reported desired capacity has
      already reached the requested value.
    operationId: POST_DescribeAutoScalingGroups
    parameters:
    - name: Action
      in: query
      value: DescribeAutoScalingGroups
    - name: Version
      in: query
      value: 2011-01-01
    requestBody:
      contentType: text/xml
      payload:
        AutoScalingGroupNames:
        - $inputs.autoScalingGroupName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      reportedDesiredCapacity: $response.body#/AutoScalingGroups/0/DesiredCapacity
      minSize: $response.body#/AutoScalingGroups/0/MinSize
      maxSize: $response.body#/AutoScalingGroups/0/MaxSize
    onSuccess:
    - name: capacityApplied
      type: goto
      stepId: describeScalingActivities
      criteria:
      - context: $response.body
        condition: $.AutoScalingGroups[0].DesiredCapacity == $inputs.desiredCapacity
        type: jsonpath
    - name: capacityPending
      type: goto
      stepId: describeScalingActivities
      criteria:
      - context: $response.body
        condition: $.AutoScalingGroups[0].DesiredCapacity != $inputs.desiredCapacity
        type: jsonpath
  - stepId: describeScalingActivities
    description: >-
      List recent scaling activities for the group so the activity triggered by
      the capacity change can be inspected.
    operationId: POST_DescribeScalingActivities
    parameters:
    - name: Action
      in: query
      value: DescribeScalingActivities
    - name: Version
      in: query
      value: 2011-01-01
    requestBody:
      contentType: text/xml
      payload:
        AutoScalingGroupName: $inputs.autoScalingGroupName
        MaxRecords: 10
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      latestActivityId: $response.body#/Activities/0/ActivityId
      latestActivityStatus: $response.body#/Activities/0/StatusCode
  outputs:
    reportedDesiredCapacity: $steps.describeGroupCapacity.outputs.reportedDesiredCapacity
    latestActivityId: $steps.describeScalingActivities.outputs.latestActivityId
    latestActivityStatus: $steps.describeScalingActivities.outputs.latestActivityStatus