feat(place): final end time + destruction wave

polylan_submitter/place/signals.py

@@ -1,5 +1,4 @@
-"""Reacts to an admin editing a PlaceSettings row (grid size, placement
-toggle) by:
+"""Reacts to an admin editing a PlaceSettings row (grid size, end time) by:
 
 1. Rebuilding that event's Redis canvas from history at the (possibly new)
    dimensions - a resize invalidates the old Redis bytes (wrong length,
@@ -9,6 +8,7 @@ toggle) by:
 2. Pushing the new settings to that event's already-connected clients. Unlike
    the clock app, place has no periodic heartbeat broadcast to piggyback
    this onto, so it's broadcast explicitly here instead.
+3. Queueing the wipe for the end time, if any (see tasks.py).
 """
 
 from asgiref.sync import async_to_sync
@@ -19,11 +19,14 @@ from django.dispatch import receiver
 from .broadcast import place_group
 from .canvas import rebuild_canvas_from_history
 from .models import PlaceSettings
+from .tasks import schedule_wipe
+from .wire import to_epoch_ms
 
 
 @receiver(post_save, sender=PlaceSettings)
 def on_settings_saved(sender, instance, **kwargs):
     rebuild_canvas_from_history(instance.event, instance.width, instance.height)
+    schedule_wipe(instance)
 
     channel_layer = get_channel_layer()
     if channel_layer is None:
@@ -34,6 +37,10 @@ def on_settings_saved(sender, instance, **kwargs):
             "type": "settings_changed",
             "width": instance.width,
             "height": instance.height,
-            "placement_enabled": instance.placement_enabled,
+            "ends_at": (
+                None
+                if instance.placement_ends_at is None
+                else to_epoch_ms(instance.placement_ends_at)
+            ),
         },
     )