matrix-docker-ansible-deploy/roles/matrix-bridge-appservice-slack/tasks/migrate_nedb_to_postgres.yml

- name: Fail if Postgres not enabled
  fail:
    msg: "Postgres via the matrix-postgres role is not enabled (`matrix_postgres_enabled`). Cannot migrate."
  when: "not matrix_postgres_enabled|bool"

# Defaults

- name: Set postgres_start_wait_time, if not provided
  set_fact:
    postgres_start_wait_time: 15
  when: "postgres_start_wait_time|default('') == ''"

# Actual import work

- name: Ensure matrix-postgres is started
  service:
    name: matrix-postgres
    state: started
    daemon_reload: yes
  register: matrix_postgres_service_start_result

- name: Wait a bit, so that Postgres can start
  wait_for:
    timeout: "{{ postgres_start_wait_time }}"
  delegate_to: 127.0.0.1
  become: false
  when: "matrix_postgres_service_start_result.changed|bool"

- name: Ensure matrix-appservice-slack is stopped
  service:
    name: matrix-appservice-slack
    state: stopped

- name: Import appservice-slack NeDB database into Postgres
  command:
    cmd: >-
      {{ matrix_host_command_docker }} run
      --rm
      --user={{ matrix_user_uid }}:{{ matrix_user_gid }}
      --cap-drop=ALL
      --network={{ matrix_docker_network }}
      --mount type=bind,src={{ matrix_appservice_slack_data_path }},dst=/data
      --entrypoint=/bin/sh
      {{ matrix_appservice_slack_docker_image }}
      -c
      '/usr/local/bin/node /usr/src/app/lib/scripts/migrateToPostgres.js --dbdir /data --connectionString {{ matrix_appservice_slack_database_connection_string }}'

- name: Archive NeDB database files
  command:
    cmd: "mv {{ matrix_appservice_slack_data_path }}/{{ item }} {{ matrix_appservice_slack_data_path }}/{{ item }}.backup"
  with_items:
    - teams.db
    - room-store.db
    - user-store.db
    - event-store.db

- name: Inject result
  set_fact:
    matrix_playbook_runtime_results: |
      {{
        matrix_playbook_runtime_results|default([])
        +
        [
          "NOTE: Your appservice-slack database files have been imported into Postgres. The original database files have been moved from `{{ matrix_appservice_slack_data_path }}/*.db` to `{{ matrix_appservice_slack_data_path }}/*.db.backup`. When you've confirmed that the import went well and everything works, you should be able to safely delete these files."
        ]
      }}