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Waiting list: Fix pathological performance on large series with seating (#4169)

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This commit is contained in:
Raphael Michel
2024-05-23 11:51:48 +02:00
committed by GitHub
parent 2619a658c9
commit e93e5c047c
2 changed files with 50 additions and 20 deletions
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50
src/pretix/base/services/waitinglist.py
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@@ -20,6 +20,7 @@
# <https://www.gnu.org/licenses/>.
#
import sys
from collections import defaultdict
from datetime import timedelta
from django.db import transaction
@@ -49,19 +50,28 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
quota_cache = {}
gone = set()
seats_available = {}
_seats_available_cache = {}
seats_used = defaultdict(int)
for m in SeatCategoryMapping.objects.filter(event=event).select_related('subevent'):
seated_product_set = set(
SeatCategoryMapping.objects.filter(event=event).values_list('product_id', 'subevent_id')
)
def _seats_available(item, subevent):
# See comment in WaitingListEntry.send_voucher() for rationale
num_free_seets_for_product = (m.subevent or event).free_seats().filter(product_id=m.product_id).count()
num_valid_vouchers_for_product = event.vouchers.filter(
Q(valid_until__isnull=True) | Q(valid_until__gte=now()),
block_quota=True,
item_id=m.product_id,
subevent_id=m.subevent_id,
waitinglistentries__isnull=False
).aggregate(free=Sum(F('max_usages') - F('redeemed')))['free'] or 0
seats_available[(m.product_id, m.subevent_id)] = num_free_seets_for_product - num_valid_vouchers_for_product
subevent_id = subevent.pk if subevent else None
if (item.pk, subevent_id) not in _seats_available_cache:
num_free_seats_for_product = (subevent or event).free_seats().filter(product_id=item.pk).count()
num_valid_vouchers_for_product = event.vouchers.filter(
Q(valid_until__isnull=True) | Q(valid_until__gte=now()),
block_quota=True,
item_id=item.pk,
subevent_id=subevent_id,
waitinglistentries__isnull=False
).aggregate(free=Sum(F('max_usages') - F('redeemed')))['free'] or 0
_seats_available_cache[item.pk, subevent_id] = num_free_seats_for_product - num_valid_vouchers_for_product
return _seats_available_cache[item.pk, subevent_id] - seats_used[item.pk, subevent_id]
prefetch_related_objects(
[event.organizer],
@@ -103,7 +113,7 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
lock_objects(quotas, shared_lock_objects=[event])
for wle in qs:
if (wle.item, wle.variation, wle.subevent) in gone:
if (wle.item_id, wle.variation_id, wle.subevent_id) in gone:
continue
ev = (wle.subevent or event)
if not ev.presale_is_running or (wle.subevent and not wle.subevent.active):
@@ -111,15 +121,15 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
if wle.subevent and not wle.subevent.presale_is_running:
continue
if event.settings.waiting_list_auto_disable and event.settings.waiting_list_auto_disable.datetime(wle.subevent or event) <= now():
gone.add((wle.item, wle.variation, wle.subevent))
gone.add((wle.item_id, wle.variation_id, wle.subevent_id))
continue
if not wle.item.is_available():
gone.add((wle.item, wle.variation, wle.subevent))
gone.add((wle.item_id, wle.variation_id, wle.subevent_id))
continue
if (wle.item_id, wle.subevent_id) in seats_available:
if seats_available[wle.item_id, wle.subevent_id] < 1:
gone.add((wle.item, wle.variation, wle.subevent))
if (wle.item_id, wle.subevent_id) in seated_product_set:
if _seats_available(wle.item, wle.subevent) < 1:
gone.add((wle.item_id, wle.variation_id, wle.subevent_id))
continue
availability = (
@@ -141,10 +151,10 @@ def assign_automatically(event: Event, user_id: int=None, subevent_id: int=None)
quota_cache[q.pk][1] - 1 if quota_cache[q.pk][1] is not None else sys.maxsize
)
if (wle.item_id, wle.subevent_id) in seats_available:
seats_available[wle.item_id, wle.subevent_id] -= 1
if (wle.item_id, wle.subevent_id) in seated_product_set:
seats_used[wle.item_id, wle.subevent_id] += 1
else:
gone.add((wle.item, wle.variation, wle.subevent))
gone.add((wle.item_id, wle.variation_id, wle.subevent_id))
return sent