arazzo: 1.0.1
info:
  title: Amazon GameLift Scale Fleet Capacity
  summary: Confirm a fleet is ACTIVE, update its desired/min/max instance counts, then read back its capacity.
  description: >-
    A capacity-management flow for an existing fleet. The workflow first
    describes the fleet to confirm it is ACTIVE (capacity can only be adjusted on
    a ready fleet), updates the fleet's desired, minimum, and maximum instance
    counts, and then reads back the fleet capacity to confirm the new settings.
    Each step spells out its AWS JSON protocol request inline, including the
    X-Amz-Target header, so the flow can be read and executed without opening the
    underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: gameLiftApi
  url: ../openapi/amazon-gamelift-openapi.yaml
  type: openapi
workflows:
- workflowId: scale-fleet-capacity
  summary: Verify a fleet is ACTIVE, update its capacity, and read back fleet capacity.
  description: >-
    Describes a fleet to confirm ACTIVE status, updates its desired/min/max
    instance counts, and retrieves the fleet capacity to confirm the change.
  inputs:
    type: object
    required:
    - fleetId
    - desiredInstances
    properties:
      fleetId:
        type: string
        description: The fleet ID or ARN to scale.
      desiredInstances:
        type: integer
        description: The number of EC2 instances to maintain in the fleet location.
      minSize:
        type: integer
        description: The minimum number of instances allowed in the fleet location.
      maxSize:
        type: integer
        description: The maximum number of instances allowed in the fleet location.
      location:
        type: string
        description: Optional remote location to scale, as an AWS Region code such as us-west-2.
  steps:
  - stepId: confirmFleetActive
    description: >-
      Describe the fleet's attributes and confirm it is in ACTIVE status before
      adjusting capacity.
    operationId: DescribeFleetAttributes
    parameters:
    - name: X-Amz-Target
      in: header
      value: GameLift.DescribeFleetAttributes
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        FleetIds:
        - $inputs.fleetId
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.FleetAttributes[0].Status == "ACTIVE"
      type: jsonpath
    outputs:
      fleetId: $response.body#/FleetAttributes/0/FleetId
      fleetStatus: $response.body#/FleetAttributes/0/Status
  - stepId: updateCapacity
    description: >-
      Update the fleet's desired, minimum, and maximum instance counts for the
      target location.
    operationId: UpdateFleetCapacity
    parameters:
    - name: X-Amz-Target
      in: header
      value: GameLift.UpdateFleetCapacity
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        FleetId: $steps.confirmFleetActive.outputs.fleetId
        DesiredInstances: $inputs.desiredInstances
        MinSize: $inputs.minSize
        MaxSize: $inputs.maxSize
        Location: $inputs.location
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      updatedFleetId: $response.body#/FleetId
  - stepId: readCapacity
    description: >-
      Retrieve the fleet's capacity settings to confirm the new desired,
      minimum, and maximum instance counts took effect.
    operationId: DescribeFleetCapacity
    parameters:
    - name: X-Amz-Target
      in: header
      value: GameLift.DescribeFleetCapacity
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        FleetIds:
        - $steps.confirmFleetActive.outputs.fleetId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      instanceCounts: $response.body#/FleetCapacity/0/InstanceCounts
  outputs:
    fleetId: $steps.confirmFleetActive.outputs.fleetId
    instanceCounts: $steps.readCapacity.outputs.instanceCounts