forked from CGM_Public/pretix_original
Restructure our python module. A lot.
This commit is contained in:
Raphael Michel
210
src/pretix/presale/views/cart.py
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210
src/pretix/presale/views/cart.py
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from datetime import timedelta
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from django.contrib import messages
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from django.core.urlresolvers import reverse
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from django.db.models import Q
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from django.shortcuts import redirect
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from django.utils.timezone import now
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from django.views.generic import View
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from django.utils.translation import ugettext_lazy as _
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from pretix.base.models import Item, ItemVariation, Quota, CartPosition
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from pretix.presale.views import CartMixin, EventViewMixin
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class CartActionMixin(CartMixin):
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def get_next_url(self):
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if "next" in self.request.GET and '://' not in self.request.GET:
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return self.request.GET.get('next')
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elif "HTTP_REFERER" in self.request.META:
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return self.request.META.get('HTTP_REFERER')
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else:
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return reverse('presale:event.index', kwargs={
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'event': self.request.event.slug,
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'organizer': self.request.event.organizer.slug,
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})
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def get_success_url(self):
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return self.get_next_url()
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def get_failure_url(self):
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return self.get_next_url()
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def _items_from_post_data(self):
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"""
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Parses the POST data and returns a list of tuples in the
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form (item id, variation id or None, number)
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"""
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items = []
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for key, value in self.request.POST.items():
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if value.strip() == '':
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continue
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if key.startswith('item_'):
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try:
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items.append((key.split("_")[1], None, int(value)))
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except ValueError:
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messages.error(self.request, _('Please enter numbers only.'))
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return False
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elif key.startswith('variation_'):
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try:
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items.append((key.split("_")[1], key.split("_")[2], int(value)))
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except ValueError:
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messages.error(self.request, _('Please enter numbers only.'))
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return False
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if len(items) == 0:
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messages.warning(self.request, _('You did not select any items.'))
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return False
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return items
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class CartRemove(EventViewMixin, CartActionMixin, View):
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def post(self, *args, **kwargs):
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items = self._items_from_post_data()
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if not items:
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return redirect(self.get_failure_url())
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qw = Q(session=self.get_session_key())
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if self.request.user.is_authenticated():
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qw |= Q(user=self.request.user)
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for item, variation, cnt in items:
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cw = qw & Q(item_id=item)
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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.current.filter(cw).order_by("-price")[:cnt]:
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cp.delete()
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messages.success(self.request, _('Your cart has been updated.'))
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return redirect(self.get_success_url())
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class CartAdd(EventViewMixin, CartActionMixin, View):
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def post(self, *args, **kwargs):
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items = self._items_from_post_data()
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if not items:
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return redirect(self.get_failure_url())
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if sum(i[2] for i in items) > self.request.event.max_items_per_order:
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# TODO: i18n plurals
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messages.error(self.request,
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_("You cannot select more than %d items per order") % self.event.max_items_per_order)
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return redirect(self.get_failure_url())
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# Fetch items from the database
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items_cache = {
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i.identity: i for i
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in Item.objects.current.filter(
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event=self.request.event,
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identity__in=[i[0] for i in items]
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).prefetch_related("quotas")
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}
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variations_cache = {
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v.identity: v for v
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in ItemVariation.objects.current.filter(
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item__event=self.request.event,
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identity__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", "values", "values__prop")
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}
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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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qw = Q(session=self.get_session_key())
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if self.request.user.is_authenticated():
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qw |= Q(user=self.request.user)
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CartPosition.objects.current.filter(
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qw & Q(event=self.request.event)).update(expires=now() + timedelta(minutes=30))
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# Process the request itself
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msg_some_unavailable = False
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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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messages.error(self.request, _('You selected an item which is not available for sale.'))
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return redirect(self.get_failure_url())
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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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# Execute restriction plugins to check whether they (a) change the price or
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# (b) make the item/variation unavailable. If neither is the case, check_restriction
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# will correctly return the default price
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price = item.check_restrictions() if variation is None else variation.check_restrictions()
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if price is False:
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if not msg_some_unavailable:
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msg_some_unavailable = True
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messages.error(self.request,
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_('Some of the items you selected were no longer available. '
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'Please see below for details.'))
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continue
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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:
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if not msg_some_unavailable:
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msg_some_unavailable = True
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messages.error(self.request,
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_('Some of the items you selected were no longer available. '
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'Please see below for details.'))
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continue
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# Assume 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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try:
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for quota in quotas:
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# Lock the quota, so no other thread is allowed to perform sales covered by this
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# quota while we're doing so.
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quota.lock()
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avail = quota.availability()
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if avail[0] != Quota.AVAILABILITY_OK:
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# This quota is sold out/currently unavailable, so do not sell this at all
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if not msg_some_unavailable:
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msg_some_unavailable = True
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messages.error(self.request,
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_('Some of the items you selected were no longer available. '
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'Please see below for details.'))
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quota_ok = 0
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break
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elif avail[1] < i[2]:
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# This quota is available, but with less than i[2] items left, so we have to
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# reduce the number of bought items
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if not msg_some_unavailable:
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msg_some_unavailable = True
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messages.error(self.request,
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_('Some of the items you selected were no longer available in '
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'the quantity you selected. Please see below for details.'))
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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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CartPosition.objects.create(
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event=self.request.event,
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session=self.get_session_key(),
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user=(self.request.user if self.request.user.is_authenticated() else None),
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item=item,
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variation=variation,
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price=price,
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expires=now() + timedelta(minutes=30)
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)
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except Quota.LockTimeoutException:
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# Is raised when there are too many threads asking for quota locks and we were
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# unaible to get one
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if not msg_some_unavailable:
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msg_some_unavailable = True
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messages.error(self.request,
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_('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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finally:
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# Release the locks. This is important ;)
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for quota in quotas:
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quota.release()
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if not msg_some_unavailable:
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messages.success(self.request, _('The items have been successfully added to your cart.'))
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return redirect(self.get_success_url())
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