CloudFormation Provision a Stack

arazzo: 1.0.1
info:
  title: CloudFormation Provision a Stack
  summary: Validate a template, create a stack, poll until CREATE_COMPLETE, then list its resources.
  description: >-
    The canonical CloudFormation provisioning flow. The workflow first validates
    the supplied template so obvious errors are caught before any resources are
    touched, then creates the stack, polls DescribeStacks until the stack
    reaches CREATE_COMPLETE (branching to a failure end if it lands in a
    ROLLBACK or FAILED state), and finally enumerates the provisioned resources.
    Every step spells out its request inline using the AWS query protocol
    (application/x-www-form-urlencoded) so the flow can be read and executed
    without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: cloudformationApi
  url: ../openapi/cloudformation-api.yml
  type: openapi
workflows:
- workflowId: provision-stack
  summary: Validate a template and provision a CloudFormation stack to completion.
  description: >-
    Validates the template body, creates the stack, waits for the stack to reach
    CREATE_COMPLETE, and lists the resources CloudFormation provisioned.
  inputs:
    type: object
    required:
    - stackName
    - templateBody
    properties:
      stackName:
        type: string
        description: The name to assign to the new stack. Unique within the region.
      templateBody:
        type: string
        description: The CloudFormation template body (JSON or YAML) to provision.
      capability:
        type: string
        description: An optional capability to acknowledge (e.g. CAPABILITY_IAM).
  steps:
  - stepId: validateTemplate
    description: >-
      Validate the template body before any resources are created so structural
      or reference errors are surfaced up front.
    operationId: validateTemplate
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        TemplateBody: $inputs.templateBody
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      capabilities: $response.body#/ValidateTemplateResult/Capabilities
  - stepId: createStack
    description: >-
      Create the stack from the validated template. After this call returns the
      stack creation has started and can be polled via DescribeStacks.
    operationId: createStack
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        StackName: $inputs.stackName
        TemplateBody: $inputs.templateBody
        Capabilities:
        - $inputs.capability
        OnFailure: ROLLBACK
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      stackId: $response.body#/CreateStackResult/StackId
  - stepId: pollStackStatus
    description: >-
      Poll DescribeStacks until the stack settles. Branch to listing resources
      when CREATE_COMPLETE is reached, or to a failure end on a rollback or
      failed terminal state.
    operationId: describeStacks
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        StackName: $inputs.stackName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      stackStatus: $response.body#/DescribeStacksResult/Stacks/0/StackStatus
      stackStatusReason: $response.body#/DescribeStacksResult/Stacks/0/StackStatusReason
    onSuccess:
    - name: stackReady
      type: goto
      stepId: listResources
      criteria:
      - context: $response.body
        condition: $.DescribeStacksResult.Stacks[0].StackStatus == "CREATE_COMPLETE"
        type: jsonpath
    - name: stackFailed
      type: end
      criteria:
      - context: $response.body
        condition: $.DescribeStacksResult.Stacks[0].StackStatus in ["CREATE_FAILED","ROLLBACK_COMPLETE","ROLLBACK_FAILED","ROLLBACK_IN_PROGRESS"]
        type: jsonpath
    - name: stillCreating
      type: goto
      stepId: pollStackStatus
      criteria:
      - context: $response.body
        condition: $.DescribeStacksResult.Stacks[0].StackStatus == "CREATE_IN_PROGRESS"
        type: jsonpath
  - stepId: listResources
    description: >-
      List the resources CloudFormation provisioned for the completed stack.
    operationId: listStackResources
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        StackName: $inputs.stackName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      resourceSummaries: $response.body#/ListStackResourcesResult/StackResourceSummaries
  outputs:
    stackId: $steps.createStack.outputs.stackId
    finalStatus: $steps.pollStackStatus.outputs.stackStatus
    resourceSummaries: $steps.listResources.outputs.resourceSummaries