add downloadable lower thirds images to be used in voctomix

pretalx_broadcast_tools/tasks.py

@@ -0,0 +1,78 @@
+import logging
+from datetime import timedelta
+
+from django.dispatch import receiver
+from django.utils.timezone import now
+from django_scopes import scope, scopes_disabled
+from pretalx.celery_app import app
+from pretalx.common.signals import periodic_task
+from pretalx.event.models import Event
+
+LOG = logging.getLogger(__name__)
+
+
+@app.task(name="pretalx_broadcast_tools.export_voctomix_lower_thirds")
+def export_voctomix_lower_thirds(*, event_id):
+    from django.core.management import call_command
+
+    with scopes_disabled():
+        event = Event.objects.filter(pk=event_id).first()
+    if not event:
+        LOG.error(f"Could not find event {event_id=} for export")
+        return
+
+    with scope(event=event):
+        if not event.current_schedule:
+            LOG.error(f"event {event.slug} does not have schedule, can't export")
+            return
+
+    call_command(
+        "export_voctomix_lower_thirds",
+        event.slug,
+    )
+
+
+@app.task(name="pretalx_broadcast_tools.periodic_voctomix_export")
+def task_periodic_voctomix_export(*, event_slug):
+    from pretalx_broadcast_tools.management.commands.export_voctomix_lower_thirds import (
+        get_export_targz_path,
+    )
+
+    with scopes_disabled():
+        event = Event.objects.filter(slug=event_slug).first()
+
+    with scope(event=event):
+        if (
+            not event.settings.broadcast_tools_lower_thirds_export_voctomix
+            or not event.current_schedule
+        ):
+            return
+
+        targz_path = get_export_targz_path(event)
+        needs_rebuild = False
+        last_rebuild = event.cache.get("broadcast_tools_last_voctomix_export")
+        _now = now()
+        if not targz_path.exists():
+            needs_rebuild = True
+        if not last_rebuild or _now - last_rebuild >= timedelta(hours=1):
+            needs_rebuild = True
+        if event.cache.get("broadcast_tools_force_new_voctomix_export"):
+            needs_rebuild = True
+
+        if needs_rebuild:
+            event.cache.delete("broadcast_tools_force_new_voctomix_export")
+            event.cache.set("broadcast_tools_last_voctomix_export", _now, None)
+            export_voctomix_lower_thirds.apply_async(
+                kwargs={"event_id": event.id}, ignore_result=True
+            )
+
+
+@receiver(periodic_task)
+def periodic_event_services(sender, **kwargs):
+    for event in Event.objects.all():
+        with scope(event=event):
+            if (event.date_to + timedelta(days=2)) < now().date():
+                continue
+            task_periodic_voctomix_export.apply_async(
+                kwargs={"event_slug": event.slug}, ignore_result=True
+            )