---
- name: Detect whether sandbox2 is already a standby
  community.postgresql.postgresql_query:
    login_db: postgres
    query: SELECT pg_is_in_recovery() AS in_recovery
  become: true
  become_user: postgres
  register: sandbox_postgresql_recovery_state

- name: Inspect databases before the initial standby seed
  community.postgresql.postgresql_query:
    login_db: postgres
    query: >-
      SELECT datname FROM pg_database
      WHERE NOT datistemplate AND datname <> 'postgres'
  become: true
  become_user: postgres
  register: sandbox_postgresql_existing_databases
  when: not sandbox_postgresql_recovery_state.query_result[0].in_recovery

- name: Refuse to overwrite a non-empty PostgreSQL node
  ansible.builtin.assert:
    that:
      - sandbox_postgresql_existing_databases.query_result | length == 0
    fail_msg: Refusing to reseed sandbox2 because it contains non-system databases
  when: not sandbox_postgresql_recovery_state.query_result[0].in_recovery

- name: Stop PostgreSQL before the initial standby seed
  ansible.builtin.service:
    name: postgresql
    state: stopped
  when: not sandbox_postgresql_recovery_state.query_result[0].in_recovery

- name: Remove the verified-empty standby data directory
  ansible.builtin.file:
    path: /var/lib/postgresql/{{ sandbox_postgresql_version }}/main
    state: absent
  when: not sandbox_postgresql_recovery_state.query_result[0].in_recovery

- name: Recreate the standby data directory
  ansible.builtin.file:
    path: /var/lib/postgresql/{{ sandbox_postgresql_version }}/main
    state: directory
    owner: postgres
    group: postgres
    mode: "0700"
  when: not sandbox_postgresql_recovery_state.query_result[0].in_recovery

- name: Install standby replication password file
  ansible.builtin.copy:
    dest: /var/lib/postgresql/.pgpass
    content: >-
      {{ sandbox_postgresql_primary_address }}:5432:*:{{ sandbox_postgresql_replication_user }}:{{ sandbox_postgresql_replication_password }}
    owner: postgres
    group: postgres
    mode: "0600"
  no_log: true

- name: Seed sandbox2 from the PostgreSQL primary
  ansible.builtin.command:
    argv:
      - /usr/bin/pg_basebackup
      - --host={{ sandbox_postgresql_primary_address }}
      - --username={{ sandbox_postgresql_replication_user }}
      - --pgdata=/var/lib/postgresql/{{ sandbox_postgresql_version }}/main
      - --format=plain
      - --wal-method=stream
      - --write-recovery-conf
      - --slot={{ sandbox_postgresql_replication_slot }}
  become: true
  become_user: postgres
  environment:
    PGPASSFILE: /var/lib/postgresql/.pgpass
  when: not sandbox_postgresql_recovery_state.query_result[0].in_recovery
  no_log: true

- name: Set the standby connection identity
  ansible.builtin.lineinfile:
    path: /var/lib/postgresql/{{ sandbox_postgresql_version }}/main/postgresql.auto.conf
    regexp: ^primary_conninfo =
    line: >-
      primary_conninfo = 'host={{ sandbox_postgresql_primary_address }} port=5432
      user={{ sandbox_postgresql_replication_user }} application_name=sandbox2
      passfile=/var/lib/postgresql/.pgpass'
    owner: postgres
    group: postgres
    mode: "0600"
  no_log: true

- name: Start PostgreSQL standby
  ansible.builtin.service:
    name: postgresql
    enabled: true
    state: started

- name: Wait for sandbox2 to enter recovery
  community.postgresql.postgresql_query:
    login_db: postgres
    query: SELECT pg_is_in_recovery() AS in_recovery
  become: true
  become_user: postgres
  register: sandbox_postgresql_standby_ready
  retries: 12
  delay: 5
  until: sandbox_postgresql_standby_ready.query_result[0].in_recovery

- name: Mark synchronous replication bootstrap complete on the primary
  ansible.builtin.copy:
    dest: /etc/postgresql/{{ sandbox_postgresql_version }}/main/sandbox-synchronous-ready
    content: "sandbox2\n"
    owner: postgres
    group: postgres
    mode: "0644"
  delegate_to: "{{ groups['postgres_primary'][0] }}"