Restart sockets when they are changed

At the moment it's possible only to forcefully restart sockets under
each run, which is not idempotent and may cause interruptions for
service. To avoid that we add a way to restart socket just on config
change with same logic applied as for service.

Change-Id: Ifb6fd9461d7b6a65191b918c0863406cf4de6725

handlers/main.yml

@@ -13,6 +13,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Restart changed sockets
+  include_tasks: handlers/socket_restart.yml
+  listen: systemd socket changed
+  when:
+    - 'socket_results is changed'
+  loop: "{{ systemd_socket.results }}"
+  loop_control:
+    loop_var: socket_results
+  tags:
+   - systemd-service
+
+
 - name: Restart changed services
   include_tasks: handlers/systemd_restart.yml
   listen: systemd service changed

handlers/socket_restart.yml

@@ -0,0 +1,27 @@
+---
+# Copyright 2023, Cleura AB.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- name: "Restart socket"
+  systemd:
+    name: "{{ socket.socket_name | replace(' ', '_') }}.socket"
+    state: restarted
+  when:
+    - "'socket_name' in socket"
+    - socket.restart_changed | default(systemd_service_restart_changed) | bool
+    - "'state' not in socket"
+    - socket.enabled | default(systemd_service_enabled) | bool
+  loop: "{{ socket_results.item }}"
+  loop_control:
+    loop_var: socket

tasks/main.yml

@@ -131,6 +131,7 @@
     group: "root"
   loop: "{{ systemd_services | subelements('sockets', skip_missing=True) }}"
   notify:
+    - systemd socket changed
     - systemd service changed
   register: systemd_socket
   tags: