django-orchestra/orchestra/apps/services/models.py

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import decimal
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from django.db import models
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from django.db.models import Q
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from django.db.models.loading import get_model
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from django.contrib.contenttypes.models import ContentType
from django.core.validators import ValidationError
from django.utils.functional import cached_property
from django.utils.translation import ugettext_lazy as _
from orchestra.core import caches, services, accounts
from orchestra.models import queryset
from orchestra.utils.apps import autodiscover
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from . import settings, rating
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from .handlers import ServiceHandler
class Plan(models.Model):
name = models.CharField(_("plan"), max_length=128)
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is_default = models.BooleanField(_("default"), default=False)
is_combinable = models.BooleanField(_("combinable"), default=True)
allow_multiple = models.BooleanField(_("allow multiple"), default=False)
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def __unicode__(self):
return self.name
class ContractedPlan(models.Model):
plan = models.ForeignKey(Plan, verbose_name=_("plan"), related_name='contracts')
account = models.ForeignKey('accounts.Account', verbose_name=_("account"),
related_name='plans')
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class Meta:
verbose_name_plural = _("plans")
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def __unicode__(self):
return str(self.plan)
def clean(self):
if not self.pk and not self.plan.allow_multipls:
if ContractedPlan.objects.filter(plan=self.plan, account=self.account).exists():
raise ValidationError("A contracted plan for this account already exists")
class RateQuerySet(models.QuerySet):
group_by = queryset.group_by
def by_account(self, account):
# Default allways selected
return self.filter(
Q(plan__is_default=True) |
Q(plan__contracts__account=account)
).order_by('plan', 'quantity').select_related('plan')
class Rate(models.Model):
service = models.ForeignKey('services.Service', verbose_name=_("service"),
related_name='rates')
plan = models.ForeignKey(Plan, verbose_name=_("plan"), related_name='rates')
quantity = models.PositiveIntegerField(_("quantity"), null=True, blank=True)
price = models.DecimalField(_("price"), max_digits=12, decimal_places=2)
objects = RateQuerySet.as_manager()
class Meta:
unique_together = ('service', 'plan', 'quantity')
def __unicode__(self):
return "{}-{}".format(str(self.price), self.quantity)
autodiscover('handlers')
class Service(models.Model):
NEVER = ''
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# DAILY = 'DAILY'
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MONTHLY = 'MONTHLY'
ANUAL = 'ANUAL'
TEN_DAYS = 'TEN_DAYS'
ONE_MONTH = 'ONE_MONTH'
ALWAYS = 'ALWAYS'
ON_REGISTER = 'ON_REGISTER'
FIXED_DATE = 'ON_FIXED_DATE'
BILLING_PERIOD = 'BILLING_PERIOD'
REGISTER_OR_RENEW = 'REGISTER_OR_RENEW'
CONCURRENT = 'CONCURRENT'
NOTHING = 'NOTHING'
DISCOUNT = 'DISCOUNT'
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COMPENSATE = 'COMPENSATE'
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REFUND = 'REFUND'
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PREPAY = 'PREPAY'
POSTPAY = 'POSTPAY'
STEP_PRICE = 'STEP_PRICE'
MATCH_PRICE = 'MATCH_PRICE'
RATE_METHODS = {
STEP_PRICE: rating.step_price,
MATCH_PRICE: rating.match_price,
}
description = models.CharField(_("description"), max_length=256, unique=True)
content_type = models.ForeignKey(ContentType, verbose_name=_("content type"))
match = models.CharField(_("match"), max_length=256, blank=True)
handler_type = models.CharField(_("handler"), max_length=256, blank=True,
help_text=_("Handler used for processing this Service. A handler "
"enables customized behaviour far beyond what options "
"here allow to."),
choices=ServiceHandler.get_plugin_choices())
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is_active = models.BooleanField(_("active"), default=True)
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# Billing
billing_period = models.CharField(_("billing period"), max_length=16,
help_text=_("Renewal period for recurring invoicing"),
choices=(
(NEVER, _("One time service")),
(MONTHLY, _("Monthly billing")),
(ANUAL, _("Anual billing")),
),
default=ANUAL, blank=True)
billing_point = models.CharField(_("billing point"), max_length=16,
help_text=_("Reference point for calculating the renewal date "
"on recurring invoices"),
choices=(
(ON_REGISTER, _("Registration date")),
(FIXED_DATE, _("Fixed billing date")),
),
default=FIXED_DATE)
# delayed_billing = models.CharField(_("delayed billing"), max_length=16,
# help_text=_("Period in which this service will be ignored for billing"),
# choices=(
# (NEVER, _("No delay (inmediate billing)")),
# (TEN_DAYS, _("Ten days")),
# (ONE_MONTH, _("One month")),
# ),
# default=ONE_MONTH, blank=True)
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is_fee = models.BooleanField(_("fee"), default=False,
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help_text=_("Designates whether this service should be billed as "
" membership fee or not"))
# Pricing
metric = models.CharField(_("metric"), max_length=256, blank=True,
help_text=_("Metric used to compute the pricing rate. "
"Number of orders is used when left blank."))
nominal_price = models.DecimalField(_("nominal price"), max_digits=12,
decimal_places=2)
tax = models.PositiveIntegerField(_("tax"), choices=settings.SERVICES_SERVICE_TAXES,
default=settings.SERVICES_SERVICE_DEFAUL_TAX)
pricing_period = models.CharField(_("pricing period"), max_length=16,
help_text=_("Period used for calculating the metric used on the "
"pricing rate"),
choices=(
(BILLING_PERIOD, _("Same as billing period")),
(MONTHLY, _("Monthly data")),
(ANUAL, _("Anual data")),
),
default=BILLING_PERIOD)
rate_algorithm = models.CharField(_("rate algorithm"), max_length=16,
help_text=_("Algorithm used to interprete the rating table"),
choices=(
(STEP_PRICE, _("Step price")),
(MATCH_PRICE, _("Match price")),
),
default=STEP_PRICE)
# orders_effect = models.CharField(_("orders effect"), max_length=16,
# help_text=_("Defines the lookup behaviour when using orders for "
# "the pricing rate computation of this service."),
# choices=(
# (REGISTER_OR_RENEW, _("Register or renew events")),
# (CONCURRENT, _("Active at every given time")),
# ),
# default=CONCURRENT)
on_cancel = models.CharField(_("on cancel"), max_length=16,
help_text=_("Defines the cancellation behaviour of this service"),
choices=(
(NOTHING, _("Nothing")),
(DISCOUNT, _("Discount")),
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(COMPENSATE, _("Compensat")),
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(REFUND, _("Refund")),
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),
default=DISCOUNT)
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# on_broken_period = models.CharField(_("on broken period", max_length=16,
# help_text=_("Defines the billing behaviour when periods are incomplete on register and on cancel"),
# choices=(
# (NOTHING, _("Nothing, period is atomic")),
# (DISCOUNT, _("Bill partially")),
# (COMPENSATE, _("Compensate on cancel")),
# (REFUND, _("Refund on cancel")),
# ),
# default=DISCOUNT)
# granularity = models.CharField(_("granularity"), max_length=16,
# help_text=_("Defines the minimum size a period can be broken into"),
# choices=(
# (DAILY, _("One day")),
# (MONTHLY, _("One month")),
# (ANUAL, _("One year")),
# ),
# default=DAILY,
# )
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payment_style = models.CharField(_("payment style"), max_length=16,
help_text=_("Designates whether this service should be paid after "
"consumtion (postpay/on demand) or prepaid"),
choices=(
(PREPAY, _("Prepay")),
(POSTPAY, _("Postpay (on demand)")),
),
default=PREPAY)
# trial_period = models.CharField(_("trial period"), max_length=16, blank=True,
# help_text=_("Period in which no charge will be issued"),
# choices=(
# (NEVER, _("No trial")),
# (TEN_DAYS, _("Ten days")),
# (ONE_MONTH, _("One month")),
# ),
# default=NEVER)
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# refund_period = models.CharField(_("refund period"), max_length=16,
# help_text=_("Period in which automatic refund will be performed on "
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# "service cancellation"),
# choices=(
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# (NEVER, _("Never refund")),
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# (TEN_DAYS, _("Ten days")),
# (ONE_MONTH, _("One month")),
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# (ALWAYS, _("Always refund")),
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# ),
# default=NEVER, blank=True)
def __unicode__(self):
return self.description
@classmethod
def get_services(cls, instance):
cache = caches.get_request_cache()
ct = ContentType.objects.get_for_model(instance)
services = cache.get(ct)
if services is None:
services = cls.objects.filter(content_type=ct, is_active=True)
cache.set(ct, services)
return services
# FIXME some times caching is nasty, do we really have to? make get_plugin more efficient?
# @property
@cached_property
def handler(self):
""" Accessor of this service handler instance """
if self.handler_type:
return ServiceHandler.get_plugin(self.handler_type)(self)
return ServiceHandler(self)
def clean(self):
content_type = self.handler.get_content_type()
if self.content_type != content_type:
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ct = str(content_type)
raise ValidationError(_("Content type must be equal to '%s'.") % ct)
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if not self.match:
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raise ValidationError(_("Match should be provided"))
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try:
obj = content_type.model_class().objects.all()[0]
except IndexError:
pass
else:
attr = None
try:
bool(self.handler.matches(obj))
except Exception as exception:
attr = "Matches"
try:
metric = self.handler.get_metric(obj)
if metric is not None:
int(metric)
except Exception as exception:
attr = "Get metric"
if attr is not None:
name = type(exception).__name__
message = exception.message
msg = "{0} {1}: {2}".format(attr, name, message)
raise ValidationError(msg)
def get_pricing_period(self):
if self.pricing_period == self.BILLING_PERIOD:
return self.billing_period
return self.pricing_period
def get_price(self, account, metric, rates=None, position=None):
"""
if position is provided an specific price for that position is returned,
accumulated price is returned otherwise
"""
if rates is None:
rates = self.get_rates(account)
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if rates:
rates = self.rate_method(rates, metric)
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if not rates:
rates = [{
'quantity': metric,
'price': self.nominal_price,
}]
counter = 0
if position is None:
ant_counter = 0
accumulated = 0
for rate in rates:
counter += rate['quantity']
if counter >= metric:
counter = metric
accumulated += (counter - ant_counter) * rate['price']
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return decimal.Decimal(accumulated)
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ant_counter = counter
accumulated += rate['price'] * rate['quantity']
else:
for rate in rates:
counter += rate['quantity']
if counter >= position:
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return decimal.Decimal(rate['price'])
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def get_rates(self, account, cache=True):
# rates are cached per account
if not cache:
return self.rates.by_account(account)
if not hasattr(self, '__cached_rates'):
self.__cached_rates = {}
rates = self.__cached_rates.get(account.id, self.rates.by_account(account))
return rates
@property
def rate_method(self):
return self.RATE_METHODS[self.rate_algorithm]
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def update_orders(self):
order_model = get_model(settings.SERVICES_ORDER_MODEL)
related_model = self.content_type.model_class()
for instance in related_model.objects.all().select_related('account'):
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order_model.update_orders(instance, service=self)
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accounts.register(ContractedPlan)
services.register(ContractedPlan, menu=False)