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New locking mechanism (#2408)

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Co-authored-by: Richard Schreiber <schreiber@rami.io>
This commit is contained in:
Raphael Michel
2023-09-11 11:44:50 +02:00
committed by GitHub
parent b2b3fa36be
commit c842ea597c
33 changed files with 1638 additions and 883 deletions
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23
src/pretix/base/models/vouchers.py
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@@ -435,28 +435,37 @@ class Voucher(LoggedModel):
@staticmethod
def clean_quota_check(data, cnt, old_instance, event, quota, item, variation):
from ..services.locking import lock_objects
from ..services.quotas import QuotaAvailability
old_quotas = Voucher.clean_quota_get_ignored(old_instance)
if event.has_subevents and data.get('block_quota') and not data.get('subevent'):
raise ValidationError(_('If you want this voucher to block quota, you need to select a specific date.'))
if quota:
if quota in old_quotas:
return
else:
avail = quota.availability(count_waitinglist=False)
new_quotas = {quota}
elif item and item.has_variations and not variation:
raise ValidationError(_('You can only block quota if you specify a specific product variation. '
'Otherwise it might be unclear which quotas to block.'))
elif item and variation:
avail = variation.check_quotas(ignored_quotas=old_quotas, subevent=data.get('subevent'))
new_quotas = set(variation.quotas.filter(subevent=data.get('subevent')))
elif item and not item.has_variations:
avail = item.check_quotas(ignored_quotas=old_quotas, subevent=data.get('subevent'))
new_quotas = set(item.quotas.filter(subevent=data.get('subevent')))
else:
raise ValidationError(_('You need to select a specific product or quota if this voucher should reserve '
'tickets.'))
if avail[0] != Quota.AVAILABILITY_OK or (avail[1] is not None and avail[1] < cnt):
if not (new_quotas - old_quotas):
return
lock_objects([q for q in (new_quotas - old_quotas) if q.size is not None], shared_lock_objects=[event])
qa = QuotaAvailability(count_waitinglist=False)
qa.queue(*(new_quotas - old_quotas))
qa.compute()
if any(r[0] != Quota.AVAILABILITY_OK or (r[1] is not None and r[1] < cnt) for r in qa.results.values()):
raise ValidationError(_('You cannot create a voucher that blocks quota as the selected product or '
'quota is currently sold out or completely reserved.'))