Move ticket cache invalidation to background task

src/pretix/control/views/event.py

@@ -31,8 +31,7 @@ from pytz import timezone
 from pretix.base.channels import get_all_sales_channels
 from pretix.base.i18n import LazyCurrencyNumber
 from pretix.base.models import (
-    CachedCombinedTicket, CachedTicket, Event, LogEntry, Order, RequiredAction,
-    TaxRule, Voucher,
+    Event, LogEntry, Order, RequiredAction, TaxRule, Voucher,
 )
 from pretix.base.models.event import EventMetaValue
 from pretix.base.services import tickets
@@ -789,12 +788,7 @@ class TicketSettings(EventSettingsViewMixin, EventPermissionRequiredMixin, FormV
                             for k in provider.form.changed_data
                         }
                     )
-                    CachedTicket.objects.filter(
-                        order_position__order__event=self.request.event, provider=provider.identifier
-                    ).delete()
-                    CachedCombinedTicket.objects.filter(
-                        order__event=self.request.event, provider=provider.identifier
-                    ).delete()
+                    tickets.invalidate_cache.apply_async(kwargs={'event': self.request.event.pk, 'provider': provider.identifier})
             else:
                 success = False
         form = self.get_form(self.get_form_class())

src/pretix/control/views/item.py

@@ -18,11 +18,12 @@ from django.views.generic.edit import DeleteView
 
 from pretix.base.forms import I18nFormSet
 from pretix.base.models import (
-    CachedTicket, CartPosition, Item, ItemCategory, ItemVariation, Order,
-    Question, QuestionAnswer, QuestionOption, Quota, Voucher,
+    CartPosition, Item, ItemCategory, ItemVariation, Order, Question,
+    QuestionAnswer, QuestionOption, Quota, Voucher,
 )
 from pretix.base.models.event import SubEvent
 from pretix.base.models.items import ItemAddOn, ItemBundle
+from pretix.base.services.tickets import invalidate_cache
 from pretix.control.forms.item import (
     CategoryForm, ItemAddOnForm, ItemAddOnsFormSet, ItemBundleForm,
     ItemBundleFormSet, ItemCreateForm, ItemUpdateForm, ItemVariationForm,
@@ -875,7 +876,7 @@ class ItemUpdateGeneral(ItemDetailMixin, EventPermissionRequiredMixin, UpdateVie
             self.object.log_action(
                 'pretix.event.item.changed', user=self.request.user, data=data
             )
-            CachedTicket.objects.filter(order_position__item=self.item).delete()
+            invalidate_cache.apply_async(kwargs={'event': self.request.event.pk, 'item': self.object.pk})
         for f in self.plugin_forms:
             f.save()
         return super().form_valid(form)

src/pretix/control/views/orders.py

@@ -43,6 +43,7 @@ from pretix.base.models.orders import (
 )
 from pretix.base.models.tax import EU_COUNTRIES
 from pretix.base.payment import PaymentException
+from pretix.base.services import tickets
 from pretix.base.services.export import export
 from pretix.base.services.invoices import (
     generate_cancellation, generate_invoice, invoice_pdf, invoice_pdf_task,
@@ -1319,8 +1320,7 @@ class OrderModifyInformation(OrderQuestionsViewMixin, OrderView):
                                'you need to do this manually.')
             messages.success(self.request, _(success_message))
 
-        CachedTicket.objects.filter(order_position__order=self.order).delete()
-        CachedCombinedTicket.objects.filter(order=self.order).delete()
+        tickets.invalidate_cache.apply_async(kwargs={'event': self.request.event.pk, 'order': self.order.pk})
 
         order_modified.send(sender=self.request.event, order=self.order)
         return redirect(self.get_order_url())
@@ -1363,8 +1363,7 @@ class OrderContactChange(OrderView):
                 for op in self.order.all_positions.all():
                     op.secret = generate_position_secret()
                     op.save()
-                CachedTicket.objects.filter(order_position__order=self.order).delete()
-                CachedCombinedTicket.objects.filter(order=self.order).delete()
+                tickets.invalidate_cache.apply_async(kwargs={'event': self.request.event.pk, 'order': self.order.pk})
                 self.order.log_action('pretix.event.order.secret.changed', user=self.request.user)
 
             self.form.save()