Add support for automatic (Postgres -> SQLite) migration to mx-puppet-discord

roles/matrix-bridge-mx-puppet-discord/defaults/main.yml

@@ -57,18 +57,17 @@ matrix_mx_puppet_discord_login_shared_secret: ''
 
 # Database configuration
 matrix_mx_puppet_discord_database_engine: 'sqlite'
+
+matrix_mx_puppet_discord_sqlite_database_path_local: "{{ matrix_mx_puppet_discord_data_path }}/database.db"
+matrix_mx_puppet_discord_sqlite_database_path_in_container: "/data/database.db"
+
 matrix_mx_puppet_discord_database_username: matrix_mx_puppet_discord
 matrix_mx_puppet_discord_database_password: ~
 matrix_mx_puppet_discord_database_hostname: 'matrix-postgres'
 matrix_mx_puppet_discord_database_port: 5432
-matrix_mx_puppet_discord_database_name: matrix_mx_puppet_discord
-matrix_mx_puppet_discord_database_file: /data/database.db
-matrix_mx_puppet_discord_database_connString: >-2
-  {%- if matrix_mx_puppet_discord_database_engine == 'postgres' -%}
-  postgresql://{{ matrix_mx_puppet_discord_database_username }}:{{ matrix_mx_puppet_discord_database_password }}@{{ matrix_mx_puppet_discord_database_hostname }}:{{ matrix_mx_puppet_discord_database_port }}/{{ matrix_mx_puppet_discord_database_name }}?sslmode=disable
-  {%- elif matrix_mx_puppet_discord_database_engine == 'sqlite' -%}
-  {{ matrix_mx_puppet_discord_database_engine }}://{{ matrix_mx_puppet_discord_database_file }}
-  {%- endif -%}
+matrix_mx_puppet_discord_database_db_name: matrix_mx_puppet_discord
+
+matrix_mx_puppet_discord_database_connection_string: 'postgresql://{{ matrix_mx_puppet_discord_database_username }}:{{ matrix_mx_puppet_discord_database_password }}@{{ matrix_mx_puppet_discord_database_hostname }}:{{ matrix_mx_puppet_discord_database_port }}/{{ matrix_mx_puppet_discord_database_db_name }}?sslmode=disable'
 
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.

roles/matrix-bridge-mx-puppet-discord/tasks/setup_install.yml

@@ -25,6 +25,32 @@
       command: "mv {{ matrix_mx_puppet_discord_base_path }}/database.db {{ matrix_mx_puppet_discord_data_path }}/database.db"
   when: "matrix_mx_puppet_discord_stat_database.stat.exists"
 
+- set_fact:
+    matrix_mx_puppet_discord_requires_restart: false
+
+- block:
+    - name: Check if an SQLite database already exists
+      stat:
+        path: "{{ matrix_mx_puppet_discord_sqlite_database_path_local }}"
+      register: matrix_mx_puppet_discord_sqlite_database_path_local_stat_result
+
+    - block:
+        - set_fact:
+            matrix_postgres_db_migration_request:
+              src: "{{ matrix_mx_puppet_discord_sqlite_database_path_local }}"
+              dst: "{{ matrix_mx_puppet_discord_database_connection_string }}"
+              caller: "{{ role_path|basename }}"
+              engine_variable_name: 'matrix_mx_puppet_discord_database_engine'
+              engine_old: 'sqlite'
+              systemd_services_to_stop: ['matrix-mx-puppet-discord.service']
+
+        - import_tasks: "roles/matrix-postgres/tasks/util/migrate_db_to_postgres.yml"
+
+        - set_fact:
+            matrix_mx_puppet_discord_requires_restart: true
+      when: "matrix_mx_puppet_discord_sqlite_database_path_local_stat_result.stat.exists|bool"
+  when: "matrix_mx_puppet_discord_database_engine == 'postgres'"
+
 - name: Ensure MX Puppet Discord image is pulled
   docker_image:
     name: "{{ matrix_mx_puppet_discord_docker_image }}"

roles/matrix-bridge-mx-puppet-discord/tasks/validate_config.yml

@@ -8,23 +8,3 @@
   with_items:
     - "matrix_mx_puppet_discord_appservice_token"
     - "matrix_mx_puppet_discord_homeserver_token"
-
-- block:
-  - name: Check if a SQLite database already exists
-    stat:
-      path: "{{ matrix_mx_puppet_discord_data_path }}/database.db"
-    register: matrix_mx_puppet_discord_sqlite_database_path_local_stat_result
-
-  - name: Fail if an SQLite database already exists when using Postgres
-    fail:
-      msg: >-2
-        matrix_mx_puppet_discord_database_engine has been set to `postgres` (which is our new default now).
-        However, we've discovered an existing SQLite database in {{ matrix_mx_puppet_discord_data_path }}/database.db.
-        It appears that you've been using this bridge with the SQLite engine until now.
-        To continue using SQLite, opt into it explicitly: add `matrix_mx_puppet_discord_database_engine: sqlite` to your vars.yml file and re-run this same command.
-        Alternatively, to migrate your existing SQLite database to Postgres:
-        1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
-        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_mx_puppet_discord_data_path }}/database.db postgres_connection_string_variable_name=matrix_mx_puppet_discord_database_connString'`)
-        3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
-    when: "matrix_mx_puppet_discord_sqlite_database_path_local_stat_result.stat.exists"
-  when: "matrix_mx_puppet_discord_database_engine == 'postgres'"

roles/matrix-bridge-mx-puppet-discord/templates/config.yaml.j2

@@ -103,14 +103,14 @@ database:
 {% if matrix_mx_puppet_discord_database_engine == 'sqlite' %}
   # Use SQLite3 as a database backend
   # The name of the database file
-  filename: /data/database.db
+  filename: {{ matrix_mx_puppet_discord_sqlite_database_path_in_container|to_json }}
 {% else %}
   # Use Postgres as a database backend
   # If set, will be used instead of SQLite3
   # Connection string to connect to the Postgres instance
   # with username "user", password "pass", host "localhost" and database name "dbname".
   # Modify each value as necessary
-  connString: {{ matrix_mx_puppet_discord_database_connString|to_json }}
+  connString: {{ matrix_mx_puppet_discord_database_connection_string|to_json }}
 {% endif %}
 
 logging: