505 lines
19 KiB
Python
505 lines
19 KiB
Python
import sys
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from django.db import models
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from django.db.migrations.recorder import MigrationRecorder
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from django.db.models import F, 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.core.validators import ValidationError
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from django.utils import timezone
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from django.utils.functional import cached_property
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from django.utils.translation import ugettext_lazy as _
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from orchestra.core import caches, services, accounts
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from orchestra.models import queryset
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from orchestra.utils.apps import autodiscover
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from orchestra.utils.python import import_class
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from . import helpers, settings, pricing
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from .handlers import ServiceHandler
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class Plan(models.Model):
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account = models.ForeignKey('accounts.Account', verbose_name=_("account"),
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related_name='plans')
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name = models.CharField(_("plan"), max_length=128,
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choices=settings.ORDERS_PLANS,
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default=settings.ORDERS_DEFAULT_PLAN)
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def __unicode__(self):
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return self.name
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class RateQuerySet(models.QuerySet):
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group_by = queryset.group_by
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def by_account(self, account):
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# Default allways selected
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qset = Q(plan='')
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for plan in account.plans.all():
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qset |= Q(plan=plan)
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return self.filter(qset)
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class Rate(models.Model):
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service = models.ForeignKey('orders.Service', verbose_name=_("service"),
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related_name='rates')
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plan = models.CharField(_("plan"), max_length=128, blank=True,
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choices=(('', _("Default")),) + settings.ORDERS_PLANS)
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quantity = models.PositiveIntegerField(_("quantity"), null=True, blank=True)
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price = models.DecimalField(_("price"), max_digits=12, decimal_places=2)
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objects = RateQuerySet.as_manager()
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class Meta:
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unique_together = ('service', 'plan', 'quantity')
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def __unicode__(self):
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return "{}-{}".format(str(self.price), self.quantity)
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autodiscover('handlers')
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class Service(models.Model):
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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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COMPENSATE = 'COMPENSATE'
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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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RATE_METHODS = {
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BEST_PRICE: pricing.best_price,
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MATCH_PRICE: pricing.match_price,
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}
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description = models.CharField(_("description"), max_length=256, unique=True)
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content_type = models.ForeignKey(ContentType, verbose_name=_("content type"))
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match = models.CharField(_("match"), max_length=256, blank=True)
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handler_type = models.CharField(_("handler"), max_length=256, blank=True,
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help_text=_("Handler used for processing this Service. A handler "
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"enables customized behaviour far beyond what options "
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"here allow to."),
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choices=ServiceHandler.get_plugin_choices())
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is_active = models.BooleanField(_("is active"), default=True)
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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, blank=True)
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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, blank=True)
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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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nominal_price = models.DecimalField(_("nominal price"), max_digits=12,
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decimal_places=2)
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tax = models.PositiveIntegerField(_("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 progressive price")),
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(PROGRESSIVE_PRICE, _("Conservative 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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# TODO remove since it can be infered from pricing period?
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# VARIABLE -> REGISTER_OR_RENEW
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# FIXED -> CONCURRENT
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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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(COMPENSATE, _("Discount and compensate")),
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(REFOUND, _("Discount, compensate and refound")),
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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, blank=True,
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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=NEVER, blank=True)
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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):
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cache = caches.get_request_cache()
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ct = ContentType.objects.get_for_model(instance)
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services = cache.get(ct)
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if services is None:
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services = cls.objects.filter(content_type=ct, is_active=True)
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cache.set(ct, services)
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return services
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# FIXME some times caching is nasty, do we really have to? make get_plugin more efficient?
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# @property
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@cached_property
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def handler(self):
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""" Accessor of this service handler instance """
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if self.handler_type:
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return ServiceHandler.get_plugin(self.handler_type)(self)
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return ServiceHandler(self)
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def clean(self):
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content_type = self.handler.get_content_type()
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if self.content_type != content_type:
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msg =_("Content type must be equal to '%s'.") % str(content_type)
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raise ValidationError(msg)
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if not self.match:
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msg =_("Match should be provided")
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raise ValidationError(msg)
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try:
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obj = content_type.model_class().objects.all()[0]
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except IndexError:
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pass
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else:
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attr = None
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try:
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bool(self.handler.matches(obj))
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except Exception as exception:
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attr = "Matches"
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try:
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metric = self.handler.get_metric(obj)
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if metric is not None:
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int(metric)
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except Exception as exception:
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attr = "Get metric"
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if attr is not None:
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name = type(exception).__name__
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message = exception.message
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msg = "{0} {1}: {2}".format(attr, name, message)
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raise ValidationError(msg)
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def get_pricing_period(self):
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if self.pricing_period == self.BILLING_PERIOD:
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return self.billing_period
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return self.pricing_period
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def get_price(self, order, metric, position=None):
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"""
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if position is provided an specific price for that position is returned,
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accumulated price is returned otherwise
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"""
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rates = self.get_rates(order.account, metric)
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counter = 0
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if position is None:
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ant_counter = 0
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accumulated = 0
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for rate in rates:
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counter += rate['quantity']
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if counter >= metric:
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counter = metric
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accumulated += (counter - ant_counter) * rate['price']
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return float(accumulated)
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ant_counter = counter
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accumulated += rate['price'] * rate['quantity']
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else:
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for rate in rates:
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counter += rate['quantity']
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if counter >= position:
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return float(rate['price'])
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def get_rates(self, account, metric):
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if not hasattr(self, '__cached_rates'):
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self.__cached_rates = {}
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if account.id in self.__cached_rates:
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rates, cache = self.__cached_rates.get(account.id)
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else:
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rates = self.rates.by_account(account)
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cache = {}
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if not rates:
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rates = [{
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'quantity': sys.maxint,
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'price': self.nominal_price,
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}]
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self.__cached_rates[account.id] = (rates, cache)
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return rates
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self.__cached_rates[account.id] = (rates, cache)
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# Caching depends on the specific rating method
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return self.rate_method(rates, metric, cache=cache)
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@property
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def rate_method(self):
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return self.RATE_METHODS[self.rate_algorithm]
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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'):
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bill_lines = []
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for service, orders in services:
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lines = service.handler.generate_bill_lines(orders, **options)
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bill_lines.extend(lines)
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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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return bills
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def pricing_effect(self, ini=None, end=None, **options):
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# TODO register but not billed duscard
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if not ini:
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for cini, ro in self.values_list('billed_until', 'registered_on'):
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if not cini:
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cini = ro
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if not ini:
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ini = cini
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ini = min(ini, cini)
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if not end:
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order = self.first()
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if order:
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service = order.service
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service.billing_point == service.FIXED_DATE
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end = service.handler.get_billing_point(order, **options)
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else:
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pass
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return self.exclude(
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cancelled_on__isnull=False, billed_until__isnull=False,
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cancelled_on__lte=F('billed_until'), billed_until__lte=ini,
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registered_on__gte=end)
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def get_related(self, ini=None, end=None):
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if not ini:
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ini = ''
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if not end:
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end = ''
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return self.pricing_effect().filter(
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Q(billed_until__isnull=False, billed_until__lt=end) |
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Q(billed_until__isnull=True, registered_on__lt=end))
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# TODO iterate over every order, calculate its billing point and find related
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qs = self.exclude(cancelled_on__isnull=False,
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billed_until__gte=F('cancelled_on')).distinct()
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original_ids = self.values_list('id', flat=True)
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return self.model.objects.exclude(id__in=original_ids).filter(
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service__in=qs.values_list('service_id', flat=True),
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account__in=qs.values_list('account_id', flat=True)
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)
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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__lt=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(Service, verbose_name=_("service"),
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related_name='orders')
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registered_on = models.DateField(_("registered on"), auto_now_add=True)
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cancelled_on = models.DateField(_("cancelled on"), null=True, blank=True)
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billed_on = models.DateField(_("billed on"), 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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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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handler = self.service.handler
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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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description = "{}: {}".format(handler.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.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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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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@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 cancel(self):
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self.cancelled_on = timezone.now()
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self.save()
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def get_metric(self, ini, end):
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return MetricStorage.get(self, ini, end)
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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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created_on = models.DateField(_("created on"), auto_now_add=True)
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updated_on = models.DateField(_("updated on"), auto_now=True)
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class Meta:
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get_latest_by = 'created_on'
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def __unicode__(self):
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return unicode(self.order)
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@classmethod
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def store(cls, order, value):
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try:
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metric = cls.objects.filter(order=order).latest()
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except cls.DoesNotExist:
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cls.objects.create(order=order, value=value)
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else:
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if metric.value != value:
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cls.objects.create(order=order, value=value)
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else:
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metric.save()
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@classmethod
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def get(cls, order, ini, end):
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try:
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return cls.objects.filter(order=order, updated_on__lt=end,
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updated_on__gte=ini).latest('updated_on').value
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except cls.DoesNotExist:
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return 0
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# TODO If this happens to be very costly then, consider an additional
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# implementation when runnning within a request/Response cycle, more efficient :)
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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 sender in services:
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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_save, dispatch_uid="orders.update_orders")
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@receiver(post_delete, dispatch_uid="orders.update_orders_post_delete")
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def update_orders(sender, **kwargs):
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exclude = (
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MetricStorage, LogEntry, Order, Service, ContentType, MigrationRecorder.Migration
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|
)
|
|
if sender not in exclude:
|
|
instance = kwargs['instance']
|
|
if instance.pk:
|
|
# post_save
|
|
Order.update_orders(instance)
|
|
related = helpers.get_related_objects(instance)
|
|
if related:
|
|
Order.update_orders(related)
|
|
|
|
|
|
accounts.register(Order)
|
|
accounts.register(Plan)
|
|
services.register(Plan, menu=False)
|