---

- name: Update Swift rings
  hosts: swift_storage,swift_proxy
  gather_facts: False
  any_errors_fatal: true
  max_fail_percentage: 0
  vars:
    base_directory: "/var/lib/config-data/puppet-generated/swift/"
    rebalance_is_safe: False
  environment:
    OS_STORAGE_URL: "{{ hostvars.localhost.undercloud_swift_url }}"
    OS_AUTH_TOKEN: "{{ hostvars.localhost.os_auth_token }}"
  tasks:
    - name: Get reference ring checksum
      run_once: true
      block:
        - name: Ensure /tmp/swift-rings directory exists
          file: path=/tmp/swift-rings state=directory

        - name: Fetch Swift rings from undercloud
          command: swift --insecure download -o /tmp/swift-rings.tar.gz overcloud-swift-rings swift-rings.tar.gz

        - name: Extract Swift rings
          unarchive:
            src: /tmp/swift-rings.tar.gz
            dest: /tmp/swift-rings
            remote_src: yes

        - name: Get reference ring checksum
          stat:
            path: /tmp/swift-rings/etc/swift/object.ring.gz
          register: result_reference

    - name: Get file attributes of object rings
      stat:
        path: "{{ base_directory }}/etc/swift/object.ring.gz"
      register: result

    - name: Abort playbook run if consistency check fails
      fail:
        msg: "object.ring.gz does not match reference checksum"
      when: (result.stat.exists == True) and (result_reference.stat.exists == True) and (result_reference.stat.checksum != result.stat.checksum)

    - name: Deploy missing Swift rings
      when: result.stat.exists == False
      block:
        - name: Fetch missing Swift rings from undercloud
          command: swift --insecure download -o /tmp/swift-rings.tar.gz overcloud-swift-rings swift-rings.tar.gz

        - name: Extract missing Swift rings
          unarchive:
            src: /tmp/swift-rings.tar.gz
            dest: /{{ base_directory }}
            remote_src: yes

    - name: Get recon data
      command: cat /var/cache/swift/object.recon
      register: recon

    - name: Check if it is safe to continue rebalancing
      set_fact:
        rebalance_is_safe: True
      when: (result.stat.exists == True) and ((recon.stdout | from_json).object_replication_last | int) > ((result.stat.mtime) | int)

    - name: Show warning and stop playbook run if unsafe
      debug:
        msg: "Rebalancing is unsafe at the moment, stopping. Please try again later"
      when: not rebalance_is_safe

    # We exit here in case there is at least one host that fails the above check
    - meta: end_play
      when: not rebalance_is_safe

    - name: Rebalance Swift rings
      run_once: true
      block:
        - name: Ensure /tmp/swift-rings directory exists
          file: path=/tmp/swift-rings state=directory

        - name: Fetch Swift rings from undercloud
          command: swift --insecure download -o /tmp/swift-rings.tar.gz overcloud-swift-rings swift-rings.tar.gz

        - name: Extract Swift rings
          unarchive:
            src: /tmp/swift-rings.tar.gz
            dest: /tmp/swift-rings
            remote_src: yes

        # Can't use with_fileglob (see https://github.com/ansible/ansible/issues/17136)
        - name: Rebalance Swift rings
          command: swift-ring-builder /tmp/swift-rings/etc/swift/{{ item }} rebalance
          with_items:
            - object.builder
            - container.builder
            - account.builder
          failed_when: result.rc > 1
          register: result

        - name: Create Swift ring archive
          archive:
            path:
                - "/tmp/swift-rings/etc"
            dest: /tmp/swift-rings.tar.gz

        - name: Copy Swift rings to the undercloud
          command: swift --insecure upload --object-name swift-rings.tar.gz overcloud-swift-rings /tmp/swift-rings.tar.gz

    - name: Update Swift rings on all nodes
      block:
        - name: Fetch Swift rings from undercloud
          command: swift --insecure download -o /tmp/swift-rings.tar.gz overcloud-swift-rings swift-rings.tar.gz

        - name: Extract Swift rings
          unarchive:
            src: /tmp/swift-rings.tar.gz
            dest: /{{ base_directory }}
            remote_src: yes