---
- name: Install MariaBackup
  apt:
    pkg: mariadb-backup

- name: Remove Primary from Known Hosts
  known_hosts:
    name: "{{ primary_private_ip }}"
    state: absent

- name: Add Primary to Known Hosts
  shell: ssh-keyscan -p {{ primary_ssh_port }} {{ primary_private_ip }} >> /root/.ssh/known_hosts

- name: Create Directory for RSync
  file:
    path: /tmp/replica
    state: directory

- name: RSync Backup Directory From Primary
  command: rsync -avpPR -e ssh\ -p{{ primary_ssh_port }} root@{{ primary_private_ip }}:/tmp/replica /
  async: 7200
  poll: 5

- name: Stop MariaDB Service
  service:
    name: mysql
    state: stopped

- name: Delete MariaDB Data Directory
  file:
    path: /var/lib/mysql
    state: absent

- name: Count Number of IBData Files
  shell: 'cd /tmp/replica && find . -name "*.ibd" | wc -l'
  register: ibdata_file_count

- name: Calculate Open Files Limit
  set_fact:
    open_files_limit: "{{ [ibdata_file_count.stdout|int + 10000, 65535] | max }}"

- name: Move Backup Directory to MariaDB Data Directory
  command: mariabackup --copy-back --target-dir /tmp/replica --open-files-limit {{ open_files_limit }} --parallel 4
  async: 3600
  poll: 5

- name: Change Ownership of MariaDB Data Directory to mysql User
  file:
    path: /var/lib/mysql
    owner: mysql
    group: mysql
    recurse: yes

- name: Change Permissions of MariaDB Data Directory
  file:
    path: /var/lib/mysql
    mode: 0755

- name: Set Open Files Count Limit for MariaDB
  lineinfile:
    dest: /lib/systemd/system/mariadb.service
    regexp: '^LimitNOFILE(\s*)=(\s*)\d+'
    line: "LimitNOFILE = infinity"
    insertafter: '\[Service\]'
    state: present

- name: Force Systemd to Reread Configuration
  systemd:
    daemon_reload: yes

- name: Start MariaDB Service
  service:
    name: mysql
    state: started

- name: Add .my.cnf MariaDB Configuration File
  template:
    src: my.cnf
    dest: /root/.my.cnf
    owner: root
    group: root
    mode: 0600

- name: Test Access to Primary
  mysql_query:
    login_user: root
    login_password: "{{ mariadb_root_password }}"
    query: "SHOW FULL PROCESSLIST"

- name: Read XtraBackup Binlog Info
  shell: cat /tmp/replica/xtrabackup_binlog_info
  register: primary_position

- name: Set Primary Position
  mysql_variables:
    mode: global
    login_user: root
    login_password: "{{ mariadb_root_password }}"
    variable: gtid_slave_pos
    value: "{{ primary_position.stdout.split()[2] }}"

- name: Set Primary Details
  mysql_replication:
    mode: changemaster
    login_user: root
    login_password: "{{ mariadb_root_password }}"
    login_port: "{{ db_port }}"
    master_host: "{{ primary_private_ip }}"
    master_user: root
    master_port: "{{ primary_db_port }}"
    master_password: "{{ mariadb_root_password }}"
    master_use_gtid: slave_pos

- name: Start MariaDB Secondary Thread
  mysql_replication:
    mode: startslave
    login_user: root
    login_port: "{{ db_port }}"
    login_password: "{{ mariadb_root_password }}"

- name: Check Secondary Status
  mysql_replication:
    mode: getslave
    login_user: root
    login_port: "{{ db_port }}"
    login_password: "{{ mariadb_root_password }}"
  register: secondary_status
  failed_when: 'secondary_status["Slave_IO_Running"] == "No" or secondary_status["Slave_SQL_Running"] == "No"'