Add tasks for syncing rooms periodically or after changes

aleksis/apps/matrix/apps.py

+from django.db.models.signals import post_save
+
 from aleksis.core.util.apps import AppConfig
 
 
@@ -11,3 +13,10 @@ class DefaultConfig(AppConfig):
     }
     licence = "EUPL-1.2+"
     copyright_info = (([2021, 2022], "Jonathan Weth", "dev@jonathanweth.de"),)
+
+    def ready(self):
+        from aleksis.core.models import Group
+
+        from .signals import post_save_matrix_signal
+
+        post_save.connect(post_save_matrix_signal, sender=Group)

aleksis/apps/matrix/signals.py

+from aleksis.apps.matrix.models import MatrixRoom
+
+from .tasks import sync_room
+
+
+def post_save_matrix_signal(sender, instance, created, **kwargs):
+    """Sync Matrix room after changing a group."""
+    if created:
+        return
+
+    for room in MatrixRoom.objects.filter(group=instance):
+        sync_room.delay(room.pk)

aleksis/apps/matrix/tasks.py

+from datetime import timedelta
 from typing import Sequence
 
 from aleksis.apps.matrix.models import MatrixRoom
@@ -25,3 +26,11 @@ def provision_group_in_matrix(pk: int):
     """Provision provided group in Matrix."""
     group = Group.objects.get(pk=pk)
     group._provision_in_matrix()
+
+
+@app.task(run_every=timedelta(days=1))
+def sync_rooms():
+    """Synchronise all Matrix rooms."""
+    rooms = MatrixRoom.objects.all()
+    for room in rooms:
+        room.sync()