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Introduce locking to prevent duplicate invoices (Z#23150548) (#4067)

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* Introduce locking to prevent duplicate invoices

This is not a perfect solution as it does not handle all code paths to
create invoices, but it handles all that seem likely to be triggered
concurrently

* Review note
This commit is contained in:
Raphael Michel
2024-04-30 10:43:13 +02:00
committed by GitHub
parent 0de96ed066
commit cebb6d3b43
3 changed files with 59 additions and 46 deletions
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67
src/pretix/control/views/orders.py
View File

@@ -129,6 +129,7 @@ from pretix.control.forms.rrule import RRuleForm
from pretix.control.permissions import EventPermissionRequiredMixin
from pretix.control.signals import order_search_forms
from pretix.control.views import PaginationMixin
from pretix.helpers import OF_SELF
from pretix.helpers.compat import CompatDeleteView
from pretix.helpers.format import format_map
from pretix.helpers.safedownload import check_token
@@ -1562,20 +1563,22 @@ class OrderInvoiceCreate(OrderView):
permission = 'can_change_orders'
def post(self, *args, **kwargs):
has_inv = self.order.invoices.exists() and not (
self.order.status in (Order.STATUS_PAID, Order.STATUS_PENDING)
and self.order.invoices.filter(is_cancellation=True).count() >= self.order.invoices.filter(is_cancellation=False).count()
)
if self.request.event.settings.get('invoice_generate') not in ('admin', 'user', 'paid', 'True') or not invoice_qualified(self.order):
messages.error(self.request, _('You cannot generate an invoice for this order.'))
elif has_inv:
messages.error(self.request, _('An invoice for this order already exists.'))
else:
inv = generate_invoice(self.order)
self.order.log_action('pretix.event.order.invoice.generated', user=self.request.user, data={
'invoice': inv.pk
})
messages.success(self.request, _('The invoice has been generated.'))
with transaction.atomic():
order = Order.objects.select_for_update(of=OF_SELF).get(pk=self.order.pk)
has_inv = order.invoices.exists() and not (
order.status in (Order.STATUS_PAID, Order.STATUS_PENDING)
and order.invoices.filter(is_cancellation=True).count() >= order.invoices.filter(is_cancellation=False).count()
)
if self.request.event.settings.get('invoice_generate') not in ('admin', 'user', 'paid', 'True') or not invoice_qualified(order):
messages.error(self.request, _('You cannot generate an invoice for this order.'))
elif has_inv:
messages.error(self.request, _('An invoice for this order already exists.'))
else:
inv = generate_invoice(order)
order.log_action('pretix.event.order.invoice.generated', user=self.request.user, data={
'invoice': inv.pk
})
messages.success(self.request, _('The invoice has been generated.'))
return redirect(self.get_order_url())
def get(self, *args, **kwargs):
@@ -1657,25 +1660,27 @@ class OrderInvoiceReissue(OrderView):
permission = 'can_change_orders'
def post(self, *args, **kwargs):
try:
inv = self.order.invoices.get(pk=kwargs.get('id'))
except Invoice.DoesNotExist:
messages.error(self.request, _('Unknown invoice.'))
else:
if inv.canceled:
messages.error(self.request, _('The invoice has already been canceled.'))
elif inv.shredded:
messages.error(self.request, _('The invoice has been cleaned of personal data.'))
with transaction.atomic():
order = Order.objects.select_for_update(of=OF_SELF).get(pk=self.order.pk)
try:
inv = order.invoices.get(pk=kwargs.get('id'))
except Invoice.DoesNotExist:
messages.error(self.request, _('Unknown invoice.'))
else:
c = generate_cancellation(inv)
if self.order.status not in (Order.STATUS_CANCELED, Order.STATUS_EXPIRED):
inv = generate_invoice(self.order)
if inv.canceled:
messages.error(self.request, _('The invoice has already been canceled.'))
elif inv.shredded:
messages.error(self.request, _('The invoice has been cleaned of personal data.'))
else:
inv = c
self.order.log_action('pretix.event.order.invoice.reissued', user=self.request.user, data={
'invoice': inv.pk
})
messages.success(self.request, _('The invoice has been reissued.'))
c = generate_cancellation(inv)
if order.status not in (Order.STATUS_CANCELED, Order.STATUS_EXPIRED):
inv = generate_invoice(order)
else:
inv = c
order.log_action('pretix.event.order.invoice.reissued', user=self.request.user, data={
'invoice': inv.pk
})
messages.success(self.request, _('The invoice has been reissued.'))
return redirect(self.get_order_url())
def get(self, *args, **kwargs): # NOQA