Amazon DocumentDB Add Instance and Await Available

arazzo: 1.0.1
info:
  title: Amazon DocumentDB Add Instance and Await Available
  summary: Add an instance to an existing cluster and poll until the instance is available.
  description: >-
    Adds a new compute instance to an existing Amazon DocumentDB cluster and
    then polls the instance description endpoint until the instance leaves the
    creating state and reports an available status. The workflow uses the AWS
    query protocol, supplying the Action and Version in the query string and the
    instance parameters as a form-urlencoded request body, and spells out each
    request inline so the flow can be read and executed without opening the
    underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: docdbApi
  url: ../openapi/amazon-documentdb-openapi.yml
  type: openapi
workflows:
- workflowId: add-instance-await-available
  summary: Add an instance to a cluster and wait until it is available.
  description: >-
    Confirms the target cluster exists, creates a new instance within it, and
    then repeatedly describes the instance and branches back to the poll step
    until the reported status is available.
  inputs:
    type: object
    required:
    - DBClusterIdentifier
    - DBInstanceIdentifier
    - DBInstanceClass
    properties:
      DBClusterIdentifier:
        type: string
        description: The identifier of the cluster the instance is added to.
      DBInstanceIdentifier:
        type: string
        description: The identifier to assign to the new DB instance.
      DBInstanceClass:
        type: string
        description: The compute and memory capacity of the instance.
      Engine:
        type: string
        description: The database engine for the instance.
        default: docdb
      AvailabilityZone:
        type: string
        description: The Availability Zone in which the instance is created.
  steps:
  - stepId: confirmCluster
    description: >-
      Confirm the target cluster exists and is available before adding an
      instance to it.
    operationId: describeDBClusters
    parameters:
    - name: Action
      in: query
      value: DescribeDBClusters
    - name: Version
      in: query
      value: '2014-10-31'
    - name: DBClusterIdentifier
      in: query
      value: $inputs.DBClusterIdentifier
    - name: MaxRecords
      in: query
      value: 1
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      clusterStatus: $response.body#/DBClusters/0/Status
  - stepId: createInstance
    description: >-
      Create the DB instance inside the target cluster using the AWS query
      protocol with the instance identifier and class in the form body.
    operationId: createDBInstance
    parameters:
    - name: Action
      in: query
      value: CreateDBInstance
    - name: Version
      in: query
      value: '2014-10-31'
    requestBody:
      contentType: application/x-www-form-urlencoded
      payload:
        DBInstanceIdentifier: $inputs.DBInstanceIdentifier
        DBInstanceClass: $inputs.DBInstanceClass
        Engine: $inputs.Engine
        DBClusterIdentifier: $inputs.DBClusterIdentifier
        AvailabilityZone: $inputs.AvailabilityZone
    successCriteria:
    - condition: $statusCode == 200
  - stepId: pollInstance
    description: >-
      Describe the instance and capture its status. Branch back to this step
      while the instance is still being created, and end when it is available.
    operationId: describeDBInstances
    parameters:
    - name: Action
      in: query
      value: DescribeDBInstances
    - name: Version
      in: query
      value: '2014-10-31'
    - name: DBInstanceIdentifier
      in: query
      value: $inputs.DBInstanceIdentifier
    - name: MaxRecords
      in: query
      value: 1
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      status: $response.body#/DBInstances/0/DBInstanceStatus
    onSuccess:
    - name: instanceAvailable
      type: end
      criteria:
      - context: $response.body
        condition: $.DBInstances[0].DBInstanceStatus == "available"
        type: jsonpath
    - name: stillCreating
      type: goto
      stepId: pollInstance
      criteria:
      - context: $response.body
        condition: $.DBInstances[0].DBInstanceStatus != "available"
        type: jsonpath
  outputs:
    DBInstanceIdentifier: $inputs.DBInstanceIdentifier
    status: $steps.pollInstance.outputs.status