Amazon Lambda Decommission Function

arazzo: 1.0.1
info:
  title: Amazon Lambda Decommission Function
  summary: Confirm a function exists, read its configuration, then delete it.
  description: >-
    Safely removes a Lambda function. The workflow first reads the function to
    confirm it exists and to capture its ARN and current State, branches to an
    end state if the function is already gone, and otherwise deletes it. Every
    step spells out its request inline so the flow can be read and executed
    without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: amazonLambdaApi
  url: ../openapi/amazon-lambda-openapi.yml
  type: openapi
workflows:
- workflowId: decommission-function
  summary: Confirm a function, capture its configuration, and delete it.
  description: >-
    Reads a function to confirm it exists and capture its ARN, branches to an
    end state when the function is missing, and otherwise deletes the function.
  inputs:
    type: object
    required:
    - FunctionName
    properties:
      FunctionName:
        type: string
        description: The name of the Lambda function to decommission.
  steps:
  - stepId: confirmFunction
    description: >-
      Read the function to confirm it exists and capture its ARN and State. A
      404 is treated as already gone and ends the workflow.
    operationId: GetFunction
    parameters:
    - name: FunctionName
      in: path
      value: $inputs.FunctionName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      functionArn: $response.body#/FunctionArn
      state: $response.body#/State
    onSuccess:
    - name: functionExists
      type: goto
      stepId: deleteFunction
      criteria:
      - condition: $statusCode == 200
    onFailure:
    - name: alreadyGone
      type: end
      criteria:
      - condition: $statusCode == 404
  - stepId: deleteFunction
    description: >-
      Delete the confirmed function.
    operationId: DeleteFunction
    parameters:
    - name: FunctionName
      in: path
      value: $inputs.FunctionName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      deletedFunctionArn: $steps.confirmFunction.outputs.functionArn
  outputs:
    deletedFunctionArn: $steps.deleteFunction.outputs.deletedFunctionArn
    lastKnownState: $steps.confirmFunction.outputs.state