Create and delete CheckoutSession throught cart lifetime

src/pretix/base/services/cart.py

@@ -61,7 +61,7 @@ from pretix.base.models import (
     Seat, SeatCategoryMapping, Voucher,
 )
 from pretix.base.models.event import SubEvent
-from pretix.base.models.orders import OrderFee
+from pretix.base.models.orders import CheckoutSession, OrderFee
 from pretix.base.models.tax import TaxRule
 from pretix.base.reldate import RelativeDateWrapper
 from pretix.base.services.checkin import _save_answers
@@ -472,6 +472,16 @@ class CartManager:
                 if term_last < time_machine_now(self.real_now_dt):
                     raise CartError(error_messages['payment_ended'])
 
+    def _ensure_checkout_session(self):
+        CheckoutSession.objects.get_or_create(
+            event=self.event,
+            cart_id=self.cart_id,
+            defaults={
+                "sales_channel": self._sales_channel,
+                "testmode": self.event.testmode,
+            },
+        )
+
     def _extend_expiry_of_valid_existing_positions(self):
         # real_now_dt is initialized at CartManager instantiation, so it's slightly in the past. Add a small
         # delta to reduce risk of extending already expired CartPositions.
@@ -1559,6 +1569,7 @@ class CartManager:
 
     def commit(self):
         self._check_presale_dates()
+        self._ensure_checkout_session()
         self._check_max_cart_size()
 
         err = self._delete_out_of_timeframe()

src/pretix/base/services/orders.py

@@ -73,7 +73,7 @@ from pretix.base.models import (
 )
 from pretix.base.models.event import SubEvent
 from pretix.base.models.orders import (
-    BlockedTicketSecret, InvoiceAddress, OrderFee, OrderRefund,
+    BlockedTicketSecret, CheckoutSession, InvoiceAddress, OrderFee, OrderRefund,
     generate_secret,
 )
 from pretix.base.models.organizer import SalesChannel, TeamAPIToken
@@ -1030,7 +1030,8 @@ def _apply_rounding_and_fees(positions: List[CartPosition], payment_requests: Li
 def _create_order(event: Event, *, email: str, positions: List[CartPosition], now_dt: datetime,
                   payment_requests: List[dict], sales_channel: SalesChannel, locale: str=None,
                   address: InvoiceAddress=None, meta_info: dict=None, shown_total=None,
-                  customer=None, valid_if_pending=False, api_meta: dict=None, tax_rounding_mode=None):
+                  customer=None, valid_if_pending=False, api_meta: dict=None, tax_rounding_mode=None,
+                  cart_id: str=None):
     payments = []
 
     try:
@@ -1113,6 +1114,8 @@ def _create_order(event: Event, *, email: str, positions: List[CartPosition], no
     if meta_info:
         for msg in meta_info.get('confirm_messages', []):
             order.log_action('pretix.event.order.consent', data={'msg': msg})
+    if cart_id:
+        CheckoutSession.objects.filter(event=event, cart_id=cart_id).delete()
 
     order_placed.send(event, order=order, bulk=False)
     return order, payments
@@ -1160,7 +1163,7 @@ def _order_placed_email_attendee(event: Event, order: Order, position: OrderPosi
 
 def _perform_order(event: Event, payment_requests: List[dict], position_ids: List[str],
                    email: str, locale: str, address: int, meta_info: dict=None, sales_channel: str='web',
-                   shown_total=None, customer=None, api_meta: dict=None, tax_rounding_mode=None):
+                   shown_total=None, customer=None, api_meta: dict=None, tax_rounding_mode=None, cart_id: str=None):
     for p in payment_requests:
         p['pprov'] = event.get_payment_providers(cached=True)[p['provider']]
         if not p['pprov']:
@@ -1267,6 +1270,7 @@ def _perform_order(event: Event, payment_requests: List[dict], position_ids: Lis
                 valid_if_pending=valid_if_pending,
                 api_meta=api_meta,
                 tax_rounding_mode=tax_rounding_mode,
+                cart_id=cart_id,
             )
 
             try:
@@ -3169,12 +3173,12 @@ class OrderChangeManager:
 def perform_order(self, event: Event, payments: List[dict], positions: List[str],
                   email: str=None, locale: str=None, address: int=None, meta_info: dict=None,
                   sales_channel: str='web', shown_total=None, customer=None, override_now_dt: datetime=None,
-                  api_meta: dict=None):
+                  api_meta: dict=None, cart_id: str=None):
     with language(locale), time_machine_now_assigned(override_now_dt):
         try:
             try:
                 return _perform_order(event, payments, positions, email, locale, address, meta_info,
-                                      sales_channel, shown_total, customer, api_meta)
+                                      sales_channel, shown_total, customer, api_meta, cart_id=cart_id)
             except LockTimeoutException:
                 self.retry()
         except (MaxRetriesExceededError, LockTimeoutException):

src/pretix/presale/checkoutflow.py

@@ -1660,6 +1660,7 @@ class ConfirmStep(CartMixin, AsyncAction, TemplateFlowStep):
             customer=self.cart_session.get('customer'),
             override_now_dt=time_machine_now(default=None),
             api_meta=api_meta,
+            cart_id=get_or_create_cart_id(request),
         )
 
     def get_success_message(self, value):