311 lines
12 KiB
Python
311 lines
12 KiB
Python
import datetime
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import decimal
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import logging
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from django.db import models
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from django.db.models import F, Q
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from django.db.models.loading import get_model
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from django.db.models.signals import post_delete, post_save, pre_delete
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from django.dispatch import receiver
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from django.contrib.contenttypes import generic
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from django.contrib.contenttypes.models import ContentType
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from django.utils import timezone
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from django.utils.translation import ugettext_lazy as _
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from orchestra.core import accounts, services
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from orchestra.models import queryset
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from orchestra.utils.python import import_class
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from . import helpers, settings
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logger = logging.getLogger(__name__)
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class OrderQuerySet(models.QuerySet):
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group_by = queryset.group_by
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def bill(self, **options):
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bills = []
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bill_backend = Order.get_bill_backend()
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qs = self.select_related('account', 'service')
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commit = options.get('commit', True)
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for account, services in qs.group_by('account', 'service').items():
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bill_lines = []
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for service, orders in services.items():
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for order in orders:
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# Saved for undoing support
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order.old_billed_on = order.billed_on
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order.old_billed_until = order.billed_until
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lines = service.handler.generate_bill_lines(orders, account, **options)
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bill_lines.extend(lines)
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# TODO make this consistent always returning the same fucking types
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if commit:
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bills += bill_backend.create_bills(account, bill_lines, **options)
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else:
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bills += [(account, bill_lines)]
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# TODO remove if commit and always return unique elemenets (set()) when the other todo is fixed
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if commit:
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return list(set(bills))
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return bills
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def givers(self, ini, end):
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return self.cancelled_and_billed().filter(billed_until__gt=ini, registered_on__lt=end)
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def cancelled_and_billed(self, exclude=False):
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qs = dict(cancelled_on__isnull=False, billed_until__isnull=False,
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cancelled_on__lte=F('billed_until'))
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if exclude:
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return self.exclude(**qs)
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return self.filter(**qs)
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def get_related(self, **options):
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""" returns related orders that could have a pricing effect """
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Service = get_model(settings.ORDERS_SERVICE_MODEL)
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conflictive = self.filter(service__metric='')
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conflictive = conflictive.exclude(service__billing_period=Service.NEVER)
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conflictive = conflictive.select_related('service').group_by('account_id', 'service')
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qs = Q()
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for account_id, services in conflictive.items():
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for service, orders in services.items():
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if not service.rates.exists():
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continue
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ini = datetime.date.max
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end = datetime.date.min
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bp = None
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for order in orders:
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bp = service.handler.get_billing_point(order, **options)
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end = max(end, bp)
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ini = min(ini, order.billed_until or order.registered_on)
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qs |= Q(
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Q(service=service, account=account_id, registered_on__lt=end) & Q(
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Q(billed_until__isnull=True) | Q(billed_until__lt=end)
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) & Q(
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Q(cancelled_on__isnull=True) | Q(cancelled_on__gt=ini)
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)
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)
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if not qs:
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return self.model.objects.none()
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ids = self.values_list('id', flat=True)
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return self.model.objects.filter(qs).exclude(id__in=ids)
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def pricing_orders(self, ini, end):
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return self.filter(billed_until__isnull=False, billed_until__gt=ini,
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registered_on__lt=end)
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def by_object(self, obj, **kwargs):
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ct = ContentType.objects.get_for_model(obj)
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return self.filter(object_id=obj.pk, content_type=ct, **kwargs)
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def active(self, **kwargs):
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""" return active orders """
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return self.filter(
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Q(cancelled_on__isnull=True) | Q(cancelled_on__gt=timezone.now())
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).filter(**kwargs)
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def inactive(self, **kwargs):
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""" return inactive orders """
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return self.filter(cancelled_on__lte=timezone.now(), **kwargs)
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class Order(models.Model):
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account = models.ForeignKey('accounts.Account', verbose_name=_("account"),
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related_name='orders')
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content_type = models.ForeignKey(ContentType)
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object_id = models.PositiveIntegerField(null=True)
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service = models.ForeignKey(settings.ORDERS_SERVICE_MODEL, verbose_name=_("service"),
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related_name='orders')
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registered_on = models.DateField(_("registered"), default=timezone.now)
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cancelled_on = models.DateField(_("cancelled"), null=True, blank=True)
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billed_on = models.DateField(_("billed"), null=True, blank=True)
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billed_until = models.DateField(_("billed until"), null=True, blank=True)
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ignore = models.BooleanField(_("ignore"), default=False)
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description = models.TextField(_("description"), blank=True)
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content_object = generic.GenericForeignKey()
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objects = OrderQuerySet.as_manager()
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class Meta:
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get_latest_by = 'id'
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def __str__(self):
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return str(self.service)
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@classmethod
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def update_orders(cls, instance, service=None, commit=True):
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updates = []
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if service is None:
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Service = get_model(settings.ORDERS_SERVICE_MODEL)
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services = Service.get_services(instance)
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else:
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services = [service]
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for service in services:
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orders = Order.objects.by_object(instance, service=service).select_related('service').active()
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if service.handler.matches(instance):
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if not orders:
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account_id = getattr(instance, 'account_id', instance.pk)
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if account_id is None:
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# New account workaround -> user.account_id == None
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continue
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ignore = service.handler.get_ignore(instance)
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order = cls(content_object=instance, service=service,
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account_id=account_id, ignore=ignore)
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if commit:
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order.save()
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updates.append((order, 'created'))
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logger.info("CREATED new order id: {id}".format(id=order.id))
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else:
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if len(orders) > 1:
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raise ValueError("A single active order was expected.")
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order = orders[0]
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updates.append((order, 'updated'))
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if commit:
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order.update()
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elif orders:
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if len(orders) > 1:
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raise ValueError("A single active order was expected.")
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order = orders[0]
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order.cancel(commit=commit)
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logger.info("CANCELLED order id: {id}".format(id=order.id))
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updates.append((order, 'cancelled'))
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return updates
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@classmethod
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def get_bill_backend(cls):
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return import_class(settings.ORDERS_BILLING_BACKEND)()
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def update(self):
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instance = self.content_object
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if instance is None:
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return
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handler = self.service.handler
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metric = ''
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if handler.metric:
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metric = handler.get_metric(instance)
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if metric is not None:
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MetricStorage.store(self, metric)
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metric = ', metric:{}'.format(metric)
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description = handler.get_order_description(instance)
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logger.info("UPDATED order id:{id}, description:{description}{metric}".format(
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id=self.id, description=description, metric=metric).encode('ascii', 'replace')
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)
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if self.description != description:
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self.description = description
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self.save(update_fields=['description'])
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def cancel(self, commit=True):
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self.cancelled_on = timezone.now()
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self.ignore = self.service.handler.get_order_ignore(self)
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if commit:
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self.save(update_fields=['cancelled_on', 'ignore'])
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logger.info("CANCELLED order id: {id}".format(id=self.id))
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def mark_as_ignored(self):
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self.ignore = True
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self.save(update_fields=['ignore'])
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def mark_as_not_ignored(self):
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self.ignore = False
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self.save(update_fields=['ignore'])
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def get_metric(self, *args, **kwargs):
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if kwargs.pop('changes', False):
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ini, end = args
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result = []
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prev = None
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for metric in self.metrics.filter(created_on__lt=end).order_by('id'):
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created = metric.created_on
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if created > ini:
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cini = prev.created_on
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if not result:
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cini = ini
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result.append((cini, created, prev.value))
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prev = metric
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if created < end:
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result.append((created, end, metric.value))
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return result
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if kwargs:
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raise AttributeError
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if len(args) == 2:
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ini, end = args
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metrics = self.metrics.filter(updated_on__lt=end, updated_on__gte=ini)
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elif len(args) == 1:
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date = args[0]
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date = datetime.date(year=date.year, month=date.month, day=date.day)
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date += datetime.timedelta(days=1)
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metrics = self.metrics.filter(updated_on__lt=date)
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elif not args:
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return self.metrics.latest('updated_on').value
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else:
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raise AttributeError
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try:
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return metrics.latest('updated_on').value
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except MetricStorage.DoesNotExist:
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return decimal.Decimal(0)
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class MetricStorage(models.Model):
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""" Stores metric state for future billing """
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order = models.ForeignKey(Order, verbose_name=_("order"), related_name='metrics')
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value = models.DecimalField(_("value"), max_digits=16, decimal_places=2)
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created_on = models.DateField(_("created"), auto_now_add=True)
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# default=lambda: timezone.now())
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# TODO time field?
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updated_on = models.DateTimeField(_("updated"))
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class Meta:
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get_latest_by = 'id'
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def __str__(self):
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return str(self.order)
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@classmethod
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def store(cls, order, value):
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now = timezone.now()
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try:
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last = cls.objects.filter(order=order).latest()
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except cls.DoesNotExist:
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cls.objects.create(order=order, value=value, updated_on=now)
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else:
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error = decimal.Decimal(str(settings.ORDERS_METRIC_ERROR))
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if value > last.value+error or value < last.value-error:
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cls.objects.create(order=order, value=value, updated_on=now)
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else:
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last.updated_on = now
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last.save(update_fields=['updated_on'])
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accounts.register(Order)
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# TODO perhas use cache = caches.get_request_cache() to cache an account delete and don't processes get_related_objects() if the case
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# FIXME https://code.djangoproject.com/ticket/24576
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# TODO build a cache hash table {model: related, model: None}
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@receiver(post_delete, dispatch_uid="orders.cancel_orders")
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def cancel_orders(sender, **kwargs):
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if sender._meta.app_label not in settings.ORDERS_EXCLUDED_APPS:
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instance = kwargs['instance']
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# Account delete will delete all related orders, no need to maintain order consistency
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if isinstance(instance, Order.account.field.rel.to):
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return
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if type(instance) in services:
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for order in Order.objects.by_object(instance).active():
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order.cancel()
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elif not hasattr(instance, 'account'):
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# FIXME Indeterminate behaviour
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related = helpers.get_related_object(instance)
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if related and related != instance:
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type(related).objects.get(pk=related.pk)
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@receiver(post_save, dispatch_uid="orders.update_orders")
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def update_orders(sender, **kwargs):
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if sender._meta.app_label not in settings.ORDERS_EXCLUDED_APPS:
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instance = kwargs['instance']
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if type(instance) in services:
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Order.update_orders(instance)
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elif not hasattr(instance, 'account'):
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related = helpers.get_related_object(instance)
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if related and related != instance:
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Order.update_orders(related)
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