Apache Kafka Decommission a Topic

arazzo: 1.0.1
info:
  title: Apache Kafka Decommission a Topic
  summary: Confirm the topic, check for active consumer groups and bound ACLs, then delete it.
  description: >-
    Deleting a Kafka topic is irreversible and takes its data with it, so this
    workflow makes the caller look before it deletes. It confirms the topic and
    captures its shape for the decommission record, lists the consumer groups on
    the cluster so an active consumer can be spotted before its stream vanishes,
    surfaces the ACLs bound to topic resources so the leftover grants are known,
    and only then deletes the topic and confirms it is gone from the inventory.
    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: kafkaRestProxyApi
  url: ../openapi/kafka-rest-proxy.yml
  type: openapi
workflows:
- workflowId: decommission-topic
  summary: Pre-flight a topic deletion against consumers and ACLs, then delete it.
  description: >-
    Records the topic's shape, checks for active consumer groups and bound
    ACLs, deletes the topic, and verifies its removal from the cluster.
  inputs:
    type: object
    required:
    - clusterId
    - topicName
    properties:
      clusterId:
        type: string
        description: The Kafka cluster id holding the topic.
      topicName:
        type: string
        description: The topic to decommission.
  steps:
  - stepId: confirmTopic
    description: >-
      Confirm the topic exists and record its partitioning and replication for
      the decommission record. An internal topic showing up here is a signal to
      stop, because deleting one breaks the cluster itself.
    operationId: getTopic
    parameters:
    - name: cluster_id
      in: path
      value: $inputs.clusterId
    - name: topic_name
      in: path
      value: $inputs.topicName
    successCriteria:
    - condition: $statusCode == 200
    - context: $response.body
      condition: $.is_internal == false
      type: jsonpath
    outputs:
      topicName: $response.body#/topic_name
      partitionsCount: $response.body#/partitions_count
      replicationFactor: $response.body#/replication_factor
  - stepId: recordPartitions
    description: >-
      Record the partition and replica layout before deletion, since it is the
      only detailed description of the topic that will survive it.
    operationId: listPartitions
    parameters:
    - name: cluster_id
      in: path
      value: $inputs.clusterId
    - name: topic_name
      in: path
      value: $inputs.topicName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      partitions: $response.body#/data
  - stepId: checkConsumerGroups
    description: >-
      List the consumer groups on the cluster so an active consumer of this
      topic can be found before its stream disappears underneath it.
    operationId: listConsumerGroups
    parameters:
    - name: cluster_id
      in: path
      value: $inputs.clusterId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      consumerGroups: $response.body#/data
  - stepId: checkBoundAcls
    description: >-
      Surface the ACLs bound to topic resources on the cluster so the grants
      left behind by this topic are known and can be cleaned up deliberately.
    operationId: searchAcls
    parameters:
    - name: cluster_id
      in: path
      value: $inputs.clusterId
    - name: resource_type
      in: query
      value: TOPIC
    - name: pattern_type
      in: query
      value: ANY
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      boundAcls: $response.body#/data
  - stepId: deleteTopic
    description: >-
      Delete the topic. This destroys every record it holds across all
      partitions and cannot be undone.
    operationId: deleteTopic
    parameters:
    - name: cluster_id
      in: path
      value: $inputs.clusterId
    - name: topic_name
      in: path
      value: $steps.confirmTopic.outputs.topicName
    successCriteria:
    - condition: $statusCode == 204
  - stepId: confirmRemoved
    description: >-
      List the cluster's topics to confirm the deletion took effect rather than
      assuming it from the 204.
    operationId: listTopics
    parameters:
    - name: cluster_id
      in: path
      value: $inputs.clusterId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      remainingTopics: $response.body#/data
  outputs:
    topicName: $steps.confirmTopic.outputs.topicName
    partitions: $steps.recordPartitions.outputs.partitions
    boundAcls: $steps.checkBoundAcls.outputs.boundAcls
    remainingTopics: $steps.confirmRemoved.outputs.remainingTopics