*untested* Revamp of backup protocol and some cleanup

playbooks/roles/mysql_backup/tasks/main.yml

@@ -0,0 +1,64 @@
+---
+- name: Ensure backup rules contains the necessary fields
+  ansible.builtin.fail:
+    msg: "You must define {{ backup_rule_checker }} in the backup ruleset"
+  when: not mysql_backup_rules[backup_rule_checker] is defined
+  loop:
+    - target
+    - target_port
+    - target_username
+    - target_password
+    - database_name
+    - backup_dir
+    - backup_name_prefix
+    - max_backups_kept
+  loop_control:
+    loop_var: backup_rule_checker
+
+- name: Ensure necessary packages are installed
+  ansible.builtin.package:
+    name:
+      - "python3-PyMySQL"
+      - "mysql_community_client"
+    state: present
+
+- name: Make sure backup dir exists
+  ansible.builtin.file:
+    path: "{{ mysql_backup_rules['backup_dir'] }}"
+    state: directory
+    recurse: true
+
+- name: Take a backup of the specified database
+  ansible.mysql.mysql_db:
+    name: "{{ mysql_backup_rules['database_name'] }}"
+    state: dump
+    target: "{{ mysql_backup_rules['backup_dir'] }}/{{ mysql_backup_rules['backup_name_prefix'] }}_{{ now().strftime('%Y%m%d%H%M%S') }}.sql.gz"
+    login_host: "{{ mysql_backup_rules['target'] }}"
+    login_port: "{{ mysql_backup_rules['target_port'] }}"
+    login_user: "{{ mysql_backup_rules['target_username'] }}"
+    login_password: "{{ mysql_backup_rules['target_password'] }}"
+
+- name: Find all files that start with the backup_name_prefix
+  ansible.builtin.find:
+    paths: "{{ mysql_backup_rules.backup_dir }}"
+    patterns: "{{ mysql_backup_rules.backup_name_prefix }}*"
+  register: all_backup_files
+
+- name: If too many backups kept
+  when: all_backup_files.files | length > mysql_backup_rules.max_backups_kept
+  block:
+    - name: Get the oldest file paths
+      ansible.builtin.set_fact:
+        oldest_file_paths: >-
+          {{ (all_backup_files.files | sort(attribute='mtime'))[:all_backup_files.files | length - mysql_backup_rules.max_backups_kept] |
+              map(attribute='path') | list }}
+      
+    - name: Remove the files
+      ansible.builtin.file:
+        path: "{{ old_file_to_delete }}"
+        state: absent
+      loop: "{{ oldest_file_paths }}"
+      loop_control:
+        loop_var: old_file_to_delete
+
+