271 lines
10 KiB
Python
271 lines
10 KiB
Python
from django.db import models
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from django.db.models import Q
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from django.db.models.signals import pre_delete, post_delete, post_save
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from django.dispatch import receiver
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from django.contrib.admin.models import LogEntry
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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 . import settings
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from .helpers import search_for_related
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class Service(models.Model):
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NEVER = 'NEVER'
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MONTHLY = 'MONTHLY'
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ANUAL = 'ANUAL'
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TEN_DAYS = 'TEN_DAYS'
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ONE_MONTH = 'ONE_MONTH'
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ALWAYS = 'ALWAYS'
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ON_REGISTER = 'ON_REGISTER'
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FIXED_DATE = 'ON_FIXED_DATE'
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BILLING_PERIOD = 'BILLING_PERIOD'
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REGISTER_OR_RENEW = 'REGISTER_OR_RENEW'
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CONCURRENT = 'CONCURRENT'
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NOTHING = 'NOTHING'
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DISCOUNT = 'DISCOUNT'
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REFOUND = 'REFOUND'
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PREPAY = 'PREPAY'
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POSTPAY = 'POSTPAY'
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BEST_PRICE = 'BEST_PRICE'
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PROGRESSIVE_PRICE = 'PROGRESSIVE_PRICE'
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MATCH_PRICE = 'MATCH_PRICE'
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description = models.CharField(_("description"), max_length=256, unique=True)
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model = models.ForeignKey(ContentType, verbose_name=_("model"))
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match = models.CharField(_("match"), max_length=256)
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is_active = models.BooleanField(_("is active"), default=True)
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# TODO class based Service definition (like ServiceBackend)
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# Billing
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billing_period = models.CharField(_("billing period"), max_length=16,
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help_text=_("Renewal period for recurring invoicing"),
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choices=(
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(NEVER, _("One time service")),
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(MONTHLY, _("Monthly billing")),
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(ANUAL, _("Anual billing")),
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),
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default=ANUAL)
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billing_point = models.CharField(_("billing point"), max_length=16,
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help_text=_("Reference point for calculating the renewal date "
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"on recurring invoices"),
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choices=(
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(ON_REGISTER, _("Registration date")),
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(FIXED_DATE, _("Fixed billing date")),
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),
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default=FIXED_DATE)
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delayed_billing = models.CharField(_("delayed billing"), max_length=16,
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help_text=_("Period in which this service will be ignored for billing"),
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choices=(
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(NEVER, _("No delay (inmediate billing)")),
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(TEN_DAYS, _("Ten days")),
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(ONE_MONTH, _("One month")),
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),
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default=ONE_MONTH)
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is_fee = models.BooleanField(_("is fee"), default=False,
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help_text=_("Designates whether this service should be billed as "
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" membership fee or not"))
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# Pricing
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metric = models.CharField(_("metric"), max_length=256, blank=True,
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help_text=_("Metric used to compute the pricing rate. "
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"Number of orders is used when left blank."))
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tax = models.IntegerField(_("tax"), choices=settings.ORDERS_SERVICE_TAXES,
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default=settings.ORDERS_SERVICE_DEFAUL_TAX)
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pricing_period = models.CharField(_("pricing period"), max_length=16,
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help_text=_("Period used for calculating the metric used on the "
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"pricing rate"),
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choices=(
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(BILLING_PERIOD, _("Same as billing period")),
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(MONTHLY, _("Monthly data")),
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(ANUAL, _("Anual data")),
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),
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default=BILLING_PERIOD)
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rate_algorithm = models.CharField(_("rate algorithm"), max_length=16,
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help_text=_("Algorithm used to interprete the rating table"),
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choices=(
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(BEST_PRICE, _("Best price")),
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(PROGRESSIVE_PRICE, _("Progressive price")),
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(MATCH_PRICE, _("Match price")),
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),
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default=BEST_PRICE)
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orders_effect = models.CharField(_("orders effect"), max_length=16,
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help_text=_("Defines the lookup behaviour when using orders for "
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"the pricing rate computation of this service."),
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choices=(
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(REGISTER_OR_RENEW, _("Register or renew events")),
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(CONCURRENT, _("Active at every given time")),
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),
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default=CONCURRENT)
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on_cancel = models.CharField(_("on cancel"), max_length=16,
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help_text=_("Defines the cancellation behaviour of this service"),
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choices=(
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(NOTHING, _("Nothing")),
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(DISCOUNT, _("Discount")),
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(REFOUND, _("Refound")),
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),
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default=DISCOUNT)
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on_disable = models.CharField(_("on disable"), max_length=16,
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help_text=_("Defines the behaviour of this service when disabled"),
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choices=(
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(NOTHING, _("Nothing")),
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(DISCOUNT, _("Discount")),
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(REFOUND, _("Refound")),
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),
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default=DISCOUNT)
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on_register = models.CharField(_("on register"), max_length=16,
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help_text=_("Defines the behaviour of this service on registration"),
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choices=(
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(NOTHING, _("Nothing")),
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(DISCOUNT, _("Discount (fixed BP)")),
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),
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default=DISCOUNT)
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payment_style = models.CharField(_("payment style"), max_length=16,
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help_text=_("Designates whether this service should be paid after "
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"consumtion (postpay/on demand) or prepaid"),
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choices=(
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(PREPAY, _("Prepay")),
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(POSTPAY, _("Postpay (on demand)")),
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),
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default=PREPAY)
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trial_period = models.CharField(_("trial period"), max_length=16,
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help_text=_("Period in which no charge will be issued"),
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choices=(
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(NEVER, _("No trial")),
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(TEN_DAYS, _("Ten days")),
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(ONE_MONTH, _("One month")),
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),
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default=NEVER)
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refound_period = models.CharField(_("refound period"), max_length=16,
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help_text=_("Period in which automatic refound will be performed on "
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"service cancellation"),
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choices=(
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(NEVER, _("Never refound")),
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(TEN_DAYS, _("Ten days")),
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(ONE_MONTH, _("One month")),
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(ALWAYS, _("Always refound")),
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),
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default=ONE_MONTH)
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def __unicode__(self):
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return self.description
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@classmethod
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def get_services(cls, instance, **kwargs):
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# TODO get per-request cache from thread local
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cache = kwargs.get('cache', {})
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ct = ContentType.objects.get_for_model(type(instance))
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try:
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return cache[ct]
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except KeyError:
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cache[ct] = cls.objects.filter(model=ct, is_active=True)
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return cache[ct]
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def matches(self, instance):
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safe_locals = {
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instance._meta.model_name: instance
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}
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return eval(self.match, safe_locals)
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class OrderQuerySet(models.QuerySet):
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def by_object(self, obj, *args, **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)
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def active(self, *args, **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(*args, **kwargs)
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class Order(models.Model):
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SAVE = 'SAVE'
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DELETE = 'DELETE'
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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(Service, verbose_name=_("price"),
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related_name='orders')
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registered_on = models.DateTimeField(_("registered on"), auto_now_add=True)
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cancelled_on = models.DateTimeField(_("cancelled on"), null=True, blank=True)
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billed_on = models.DateTimeField(_("billed on"), null=True, blank=True)
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billed_until = models.DateTimeField(_("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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def __unicode__(self):
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return str(self.service)
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def update(self):
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instance = self.content_object
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if self.service.metric:
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metric = self.service.get_metric(instance)
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self.store_metric(instance, metric)
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description = "{}: {}".format(self.service.description, str(instance))
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if self.description != description:
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self.description = description
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self.save()
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@classmethod
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def update_orders(cls, instance):
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for service in Service.get_services(instance):
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orders = Order.objects.by_object(instance, service=service).active()
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if service.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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order = cls.objects.create(content_object=instance,
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service=service, account_id=account_id)
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else:
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order = orders.get()
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order.update()
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elif orders:
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orders.get().cancel()
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def cancel(self):
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self.cancelled_on = timezone.now()
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self.save()
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class MetricStorage(models.Model):
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order = models.ForeignKey(Order, verbose_name=_("order"))
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value = models.BigIntegerField(_("value"))
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date = models.DateTimeField(_("date"))
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def __unicode__(self):
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return self.order
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@receiver(pre_delete, dispatch_uid="orders.cancel_orders")
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def cancel_orders(sender, **kwargs):
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if not sender in [MetricStorage, LogEntry, Order, Service]:
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instance = kwargs['instance']
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for order in Order.objects.by_object(instance).active():
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order.cancel()
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@receiver(post_delete, dispatch_uid="orders.update_orders_on_delete")
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def update_orders_on_delete(sender, **kwargs):
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if not sender in [MetricStorage, LogEntry, Order, Service]:
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instance = kwargs['instance']
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related = search_for_related(instance)
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if related:
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Order.update_orders(related)
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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 not sender in [MetricStorage, LogEntry, Order, Service]:
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instance = kwargs['instance']
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Order.update_orders(instance)
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related = search_for_related(instance)
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if related:
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Order.update_orders(related)
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