forked from CGM_Public/pretix_original
260 lines
11 KiB
Python
260 lines
11 KiB
Python
from datetime import datetime, timedelta
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from django.conf import settings
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from django.db.models import Q
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from django.utils.timezone import now
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from django.utils.translation import ugettext_lazy as _
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from typing import List, Optional, Tuple
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from pretix.base.i18n import LazyLocaleException
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from pretix.base.models import (
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CartPosition, Event, EventLock, Item, ItemVariation, Quota, Voucher,
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)
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class CartError(LazyLocaleException):
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pass
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error_messages = {
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'busy': _('We were not able to process your request completely as the '
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'server was too busy. Please try again.'),
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'empty': _('You did not select any products.'),
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'not_for_sale': _('You selected a product which is not available for sale.'),
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'unavailable': _('Some of the products you selected were no longer available. '
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'Please see below for details.'),
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'in_part': _('Some of the products you selected were no longer available in '
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'the quantity you selected. Please see below for details.'),
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'max_items': _("You cannot select more than %s items per order"),
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'not_started': _('The presale period for this event has not yet started.'),
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'ended': _('The presale period has ended.'),
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'voucher_invalid': _('This voucher code is not known in our database.'),
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'voucher_redeemed': _('This voucher code has already been used an can only be used once.'),
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'voucher_expired': _('This voucher is expired'),
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}
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def _extend_existing(event: Event, cart_id: str, expiry: datetime) -> None:
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# Extend this user's cart session to 30 minutes from now to ensure all items in the
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# cart expire at the same time
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# We can extend the reservation of items which are not yet expired without risk
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CartPosition.objects.filter(
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Q(cart_id=cart_id) & Q(event=event) & Q(expires__gt=now())
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).update(expires=expiry)
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def _re_add_expired_positions(items: List[CartPosition], event: Event, cart_id: str) -> List[CartPosition]:
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positions = set()
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# For items that are already expired, we have to delete and re-add them, as they might
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# be no longer available or prices might have changed. Sorry!
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expired = CartPosition.objects.filter(
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Q(cart_id=cart_id) & Q(event=event) & Q(expires__lte=now())
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)
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for cp in expired:
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items.insert(0, (cp.item_id, cp.variation_id, 1, cp))
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positions.add(cp)
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return positions
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def _delete_expired(expired: List[CartPosition]) -> None:
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for cp in expired:
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if cp.expires <= now():
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cp.delete()
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def _check_date(event: Event) -> None:
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if event.presale_start and now() < event.presale_start:
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raise CartError(error_messages['not_started'])
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if event.presale_end and now() > event.presale_end:
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raise CartError(error_messages['ended'])
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def _add_new_items(event: Event, items: List[Tuple[int, Optional[int], int]],
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cart_id: str, expiry: datetime) -> Optional[str]:
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err = None
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# Fetch items from the database
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items_query = Item.objects.filter(event=event, id__in=[i[0] for i in items]).prefetch_related(
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"quotas")
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items_cache = {i.id: i for i in items_query}
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variations_query = ItemVariation.objects.filter(
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item__event=event,
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id__in=[i[1] for i in items if i[1] is not None]
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).select_related("item", "item__event").prefetch_related("quotas")
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variations_cache = {v.id: v for v in variations_query}
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for i in items:
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# Check whether the specified items are part of what we just fetched from the database
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# If they are not, the user supplied item IDs which either do not exist or belong to
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# a different event
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if i[0] not in items_cache or (i[1] is not None and i[1] not in variations_cache):
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err = err or error_messages['not_for_sale']
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continue
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item = items_cache[i[0]]
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variation = variations_cache[i[1]] if i[1] is not None else None
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# Fetch all quotas. If there are no quotas, this item is not allowed to be sold.
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quotas = list(item.quotas.all()) if variation is None else list(variation.quotas.all())
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if len(quotas) == 0 or not item.is_available():
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err = err or error_messages['unavailable']
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continue
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# Check that all quotas allow us to buy i[2] instances of the object
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quota_ok = i[2]
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for quota in quotas:
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avail = quota.availability()
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if avail[1] is not None and avail[1] < i[2]:
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# This quota is not available or less than i[2] items are left, so we have to
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# reduce the number of bought items
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if avail[0] != Quota.AVAILABILITY_OK:
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err = err or error_messages['unavailable']
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else:
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err = err or error_messages['in_part']
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quota_ok = min(quota_ok, avail[1])
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# Create a CartPosition for as much items as we can
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for k in range(quota_ok):
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if len(i) > 3 and i[2] == 1:
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# Recreating
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cp = i[3]
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cp.expires = expiry
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cp.price = item.default_price if variation is None else (
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variation.default_price if variation.default_price is not None else item.default_price)
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cp.save()
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else:
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CartPosition.objects.create(
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event=event, item=item, variation=variation,
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price=item.default_price if variation is None else (
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variation.default_price if variation.default_price is not None else item.default_price),
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expires=expiry,
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cart_id=cart_id
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)
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return err
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def _add_voucher(event: Event, voucher: str, expiry: datetime, cart_id: str):
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try:
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v = Voucher.objects.get(code=voucher, event=event)
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if v.redeemed:
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raise CartError(error_messages['voucher_redeemed'])
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if v.valid_until is not None and v.valid_until < now():
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raise CartError(error_messages['voucher_expired'])
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quotas = list(v.item.quotas.all())
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if len(quotas) == 0 or not v.item.is_available():
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raise CartError(error_messages['unavailable'])
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if not v.allow_ignore_quota and not v.block_quota:
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for quota in quotas:
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avail = quota.availability()
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if avail[1] is not None and avail[1] < 1:
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raise CartError(error_messages['unavailable'])
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CartPosition.objects.create(
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event=event, item=v.item, variation=v.variation,
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price=v.price if v.price is not None else v.item.default_price,
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expires=expiry, cart_id=cart_id, voucher=v
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)
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except Voucher.DoesNotExist:
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raise CartError(error_messages['voucher_invalid'])
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def _add_items_to_cart(event: Event, items: List[Tuple[int, Optional[int], int]], cart_id: str=None,
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voucher: str=None) -> None:
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with event.lock():
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_check_date(event)
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existing = CartPosition.objects.filter(Q(cart_id=cart_id) & Q(event=event)).count()
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if sum(i[2] for i in items) + existing > int(event.settings.max_items_per_order):
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# TODO: i18n plurals
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raise CartError(error_messages['max_items'], (event.settings.max_items_per_order,))
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expiry = now() + timedelta(minutes=event.settings.get('reservation_time', as_type=int))
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_extend_existing(event, cart_id, expiry)
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expired = _re_add_expired_positions(items, event, cart_id)
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if items:
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err = _add_new_items(event, items, cart_id, expiry)
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_delete_expired(expired)
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if err:
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raise CartError(err)
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elif not voucher:
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raise CartError(error_messages['empty'])
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if voucher:
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_add_voucher(event, voucher, expiry, cart_id)
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def add_items_to_cart(event: int, items: List[Tuple[int, Optional[int], int]], cart_id: str=None,
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voucher: str=None) -> None:
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"""
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Adds a list of items to a user's cart.
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:param event: The event ID in question
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:param items: A list of tuple of the form (item id, variation id or None, number)
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:param session: Session ID of a guest
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:param coupon: A coupon that should also be reeemed
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:raises CartError: On any error that occured
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"""
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event = Event.objects.get(id=event)
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try:
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_add_items_to_cart(event, items, cart_id, voucher)
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except EventLock.LockTimeoutException:
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raise CartError(error_messages['busy'])
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def _remove_items_from_cart(event: int, items: List[Tuple[int, Optional[int], int]], cart_id: str) -> None:
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with event.lock():
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for item, variation, cnt in items:
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cw = Q(cart_id=cart_id) & Q(item_id=item) & Q(event=event)
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if variation:
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cw &= Q(variation_id=variation)
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else:
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cw &= Q(variation__isnull=True)
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for cp in CartPosition.objects.filter(cw).order_by("-price")[:cnt]:
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cp.delete()
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def remove_items_from_cart(event: int, items: List[Tuple[int, Optional[int], int]], cart_id: str=None) -> None:
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"""
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Removes a list of items from a user's cart.
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:param event: The event ID in question
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:param items: A list of tuple of the form (item id, variation id or None, number)
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:param session: Session ID of a guest
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"""
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event = Event.objects.get(id=event)
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try:
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_remove_items_from_cart(event, items, cart_id)
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except EventLock.LockTimeoutException:
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raise CartError(error_messages['busy'])
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if settings.HAS_CELERY:
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from pretix.celery import app
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@app.task(bind=True, max_retries=5, default_retry_delay=1)
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def add_items_to_cart_task(self, event: int, items: List[Tuple[int, Optional[int], int]], cart_id: str,
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voucher: str=None):
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event = Event.objects.get(id=event)
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try:
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try:
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_add_items_to_cart(event, items, cart_id, voucher)
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except EventLock.LockTimeoutException:
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self.retry(exc=CartError(error_messages['busy']))
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except CartError as e:
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return e
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@app.task(bind=True, max_retries=5, default_retry_delay=1)
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def remove_items_from_cart_task(self, event: int, items: List[Tuple[int, Optional[int], int]], cart_id: str):
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event = Event.objects.get(id=event)
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try:
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try:
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_remove_items_from_cart(event, items, cart_id)
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except EventLock.LockTimeoutException:
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self.retry(exc=CartError(error_messages['busy']))
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except CartError as e:
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return e
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add_items_to_cart.task = add_items_to_cart_task
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remove_items_from_cart.task = remove_items_from_cart_task
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