Amazon Fargate Provision and Run a Task

arazzo: 1.0.1
info:
  title: Amazon Fargate Provision and Run a Task
  summary: Create a cluster, register a Fargate task definition, run a task, and poll until it reaches RUNNING.
  description: >-
    The canonical Fargate launch flow. The workflow creates an ECS cluster,
    registers a FARGATE-compatible task definition, runs a single task with an
    awsvpc network configuration, and then polls DescribeTasks until the task's
    lastStatus reaches RUNNING (or STOPPED). Each step spells out its request
    inline — including the AWS JSON 1.1 content type and the X-Amz-Target action
    header — so the flow can be read and executed without opening the underlying
    OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: fargateApi
  url: ../openapi/amazon-fargate-openapi.yml
  type: openapi
workflows:
- workflowId: provision-and-run-task
  summary: Stand up a cluster and task definition, then run and confirm a Fargate task is RUNNING.
  description: >-
    Chains createCluster, registerTaskDefinition, and runTask, then loops over
    describeTasks until the started task reports a terminal or running state.
  inputs:
    type: object
    required:
    - clusterName
    - family
    - containerName
    - image
    - subnets
    - securityGroups
    properties:
      clusterName:
        type: string
        description: Name for the ECS cluster to create.
      family:
        type: string
        description: Family name for the task definition to register.
      containerName:
        type: string
        description: Name of the container in the task definition.
      image:
        type: string
        description: Container image URI (e.g. nginx:latest).
      cpu:
        type: string
        description: Task-level CPU units for Fargate (e.g. "256").
        default: "256"
      memory:
        type: string
        description: Task-level memory in MiB for Fargate (e.g. "512").
        default: "512"
      executionRoleArn:
        type: string
        description: ARN of the ECS task execution role.
      subnets:
        type: array
        items:
          type: string
        description: Subnet IDs for the awsvpc network configuration.
      securityGroups:
        type: array
        items:
          type: string
        description: Security group IDs for the awsvpc network configuration.
      assignPublicIp:
        type: string
        description: Whether to assign a public IP (ENABLED or DISABLED).
        default: ENABLED
  steps:
  - stepId: createCluster
    description: Create the ECS cluster that will host the Fargate task.
    operationId: createCluster
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.CreateCluster
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        clusterName: $inputs.clusterName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      clusterArn: $response.body#/cluster/clusterArn
      clusterStatus: $response.body#/cluster/status
  - stepId: registerTaskDefinition
    description: Register a FARGATE-compatible task definition with the supplied container.
    operationId: registerTaskDefinition
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.RegisterTaskDefinition
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        family: $inputs.family
        requiresCompatibilities:
        - FARGATE
        networkMode: awsvpc
        cpu: $inputs.cpu
        memory: $inputs.memory
        executionRoleArn: $inputs.executionRoleArn
        containerDefinitions:
        - name: $inputs.containerName
          image: $inputs.image
          essential: true
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      taskDefinitionArn: $response.body#/taskDefinition/taskDefinitionArn
      revision: $response.body#/taskDefinition/revision
  - stepId: runTask
    description: Run a single task from the registered task definition on Fargate.
    operationId: runTask
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.RunTask
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        cluster: $steps.createCluster.outputs.clusterArn
        taskDefinition: $steps.registerTaskDefinition.outputs.taskDefinitionArn
        launchType: FARGATE
        count: 1
        networkConfiguration:
          awsvpcConfiguration:
            subnets: $inputs.subnets
            securityGroups: $inputs.securityGroups
            assignPublicIp: $inputs.assignPublicIp
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      taskArn: $response.body#/tasks/0/taskArn
      lastStatus: $response.body#/tasks/0/lastStatus
  - stepId: pollTaskStatus
    description: >-
      Poll DescribeTasks until the started task reaches RUNNING or STOPPED. The
      loop re-enters this step while the task is still provisioning or pending.
    operationId: describeTasks
    parameters:
    - name: X-Amz-Target
      in: header
      value: AmazonEC2ContainerServiceV20141113.DescribeTasks
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        cluster: $steps.createCluster.outputs.clusterArn
        tasks:
        - $steps.runTask.outputs.taskArn
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      lastStatus: $response.body#/tasks/0/lastStatus
      desiredStatus: $response.body#/tasks/0/desiredStatus
    onSuccess:
    - name: stillStarting
      type: goto
      stepId: pollTaskStatus
      criteria:
      - context: $response.body
        condition: $.tasks[0].lastStatus != 'RUNNING' && $.tasks[0].lastStatus != 'STOPPED'
        type: jsonpath
    - name: settled
      type: end
      criteria:
      - context: $response.body
        condition: $.tasks[0].lastStatus == 'RUNNING' || $.tasks[0].lastStatus == 'STOPPED'
        type: jsonpath
  outputs:
    clusterArn: $steps.createCluster.outputs.clusterArn
    taskDefinitionArn: $steps.registerTaskDefinition.outputs.taskDefinitionArn
    taskArn: $steps.runTask.outputs.taskArn
    finalStatus: $steps.pollTaskStatus.outputs.lastStatus