Refactor TimescaleDB setup/configuration (#1347)

* Refactor TimescaleDB tasks

Query the db to actually see if we've got timescale configured
instead of relying on files.

Use the same task for importing the hypertable schema, and just
conditionally change the path to the schemas.

* Run Timescale schema during an upgrade

In the case that timescale has already been enabled, and we're
upgrading from 6.x to 7.x, the auditlog should also get converted.
(Which it was not in the 6.x schemas)

roles/zabbix_server/tasks/initialize-pgsql.yml

@@ -91,47 +91,44 @@
         state: restore
         target: /usr/share/zabbix-sql-scripts/postgresql/server.sql.gz
 
-- name: "PostgreSQL | Create TimescaleDB hypertables Zabbix < 7.0"
-  ansible.builtin.shell: |
-    set -euxo pipefail
-    cd /usr/share/zabbix-sql-scripts/postgresql &&
-    if [ -f timescaledb.sql.gz ]; then zcat timescaledb.sql.gz > /etc/timescaledb.sql ; else cp -p timescaledb.sql /etc/timescaledb.sql ; fi
-    cat /etc/timescaledb.sql | psql -h '{{ zabbix_server_dbhost }}' \
-    -U '{{ zabbix_server_dbuser }}' \
-    -d '{{ zabbix_server_dbname }}' \
-    -p '{{ zabbix_server_dbport }}'
-    touch /etc/zabbix/timescaledb.done
-    rm -f /tmp/timescaledb.sql
-  args:
-    creates: /etc/zabbix/timescaledb.done
-    executable: /bin/bash
-  environment:
-    PGPASSWORD: "{{ zabbix_server_dbpassword }}"
-  become: true
-  when:
-    - zabbix_server_database_timescaledb
-    - zabbix_server_version is version( '7.0', '<')
+- name: "Configure Timescale"
+  when: zabbix_server_database_timescaledb
   tags:
     - database
+  block:
+    - name: "PostgreSQL | Check if TimescaleDB has been configured"
+      community.postgresql.postgresql_query:
+        login_user: "{{ zabbix_server_dbuser }}"
+        login_password: "{{ zabbix_server_dbpassword }}"
+        login_host: "{{ zabbix_server_dbhost }}"
+        port: "{{ zabbix_server_dbport }}"
+        db: "{{ zabbix_server_dbname }}"
+        query: "SELECT db_extension FROM config WHERE db_extension = 'timescaledb'"
+      register: _config_db_extension
 
-- name: "PostgreSQL | Create TimescaleDB hypertables Zabbix >= 7.0"
-  ansible.builtin.shell: |
-    set -euxo pipefail
-    cd /usr/share/zabbix-sql-scripts/postgresql/timescaledb &&
-    cat schema.sql | psql -h '{{ zabbix_server_dbhost }}' \
-    -U '{{ zabbix_server_dbuser }}' \
-    -d '{{ zabbix_server_dbname }}' \
-    -p '{{ zabbix_server_dbport }}'
-    touch /etc/zabbix/timescaledb.done
-    rm -f /tmp/timescaledb.sql
-  args:
-    creates: /etc/zabbix/timescaledb.done
-    executable: /bin/bash
-  environment:
-    PGPASSWORD: "{{ zabbix_server_dbpassword }}"
-  become: true
-  when:
-    - zabbix_server_database_timescaledb
-    - zabbix_server_version is version( '7.0', '>=')
-  tags:
-    - database
+    # NOTE: Zabbix 7.0 adds a hypertable for auditlog.
+    - name: "PostgreSQL | Check for auditlog hypertable"
+      community.postgresql.postgresql_query:
+        login_user: "{{ zabbix_server_dbuser }}"
+        login_password: "{{ zabbix_server_dbpassword }}"
+        login_host: "{{ zabbix_server_dbhost }}"
+        port: "{{ zabbix_server_dbport }}"
+        db: "{{ zabbix_server_dbname }}"
+        query: "SELECT hypertable_name FROM timescaledb_information.hypertables WHERE hypertable_name = 'auditlog'"
+      register: _hypertable_auditlog
+
+    - name: "PostgreSQL | Create TimescaleDB hypertables"
+      when: (_config_db_extension.query_result | length == 0) or
+        (zabbix_server_version is version('7.0', '>=') and _hypertable_auditlog.query_result | length == 0)
+      community.postgresql.postgresql_db:
+        login_user: "{{ zabbix_server_dbuser }}"
+        login_password: "{{ zabbix_server_dbpassword }}"
+        login_host: "{{ zabbix_server_dbhost }}"
+        port: "{{ zabbix_server_dbport }}"
+        db: "{{ zabbix_server_dbname }}"
+        state: restore
+        target: "{{ is_legacy_version | ternary(legacy_path, modern_path) }}"
+      vars:
+        is_legacy_version: "{{ zabbix_server_version is version('7.0', '<') }}"
+        legacy_path: /usr/share/zabbix-sql-scripts/postgresql/timescaledb.sql
+        modern_path: /usr/share/zabbix-sql-scripts/postgresql/timescaledb/schema.sql