django-orchestra-test/orchestra/apps/orders/handlers.py

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import calendar
from dateutil.relativedelta import relativedelta
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from django.contrib.contenttypes.models import ContentType
from django.db.models import Q
from django.utils import timezone
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from django.utils.translation import ugettext_lazy as _
from orchestra.utils import plugins
from .helpers import get_register_or_cancel_events, get_register_or_renew_events
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class ServiceHandler(plugins.Plugin):
"""
Separates all the logic of billing handling from the model allowing to better
customize its behaviout
"""
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model = None
__metaclass__ = plugins.PluginMount
def __init__(self, service):
self.service = service
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def __getattr__(self, attr):
return getattr(self.service, attr)
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@classmethod
def get_plugin_choices(cls):
choices = super(ServiceHandler, cls).get_plugin_choices()
return [('', _("Default"))] + choices
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def get_content_type(self):
if not self.model:
return self.content_type
app_label, model = self.model.split('.')
return ContentType.objects.get_by_natural_key(app_label, model.lower())
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def matches(self, instance):
safe_locals = {
instance._meta.model_name: instance
}
return eval(self.match, safe_locals)
def get_metric(self, instance):
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if self.metric:
safe_locals = {
instance._meta.model_name: instance
}
return eval(self.metric, safe_locals)
def get_billing_point(self, order, bp=None, **options):
not_cachable = self.billing_point is self.FIXED_DATE and options.get('fixed_point')
if not_cachable or bp is None:
bp = options.get('billing_point', timezone.now().date())
if not options.get('fixed_point'):
if self.billing_period is self.MONTHLY:
date = bp
if self.payment_style is self.PREPAY:
date += relativedelta(months=1)
if self.billing_point is self.ON_REGISTER:
day = order.registered_on.day
elif self.billing_point is self.FIXED_DATE:
day = 1
bp = datetime.datetime(year=date.year, month=date.month,
day=day, tzinfo=timezone.get_current_timezone())
elif self.billing_period is self.ANUAL:
if self.billing_point is self.ON_REGISTER:
month = order.registered_on.month
day = order.registered_on.day
elif self.billing_point is self.FIXED_DATE:
month = settings.ORDERS_SERVICE_ANUAL_BILLING_MONTH
day = 1
year = bp.year
if self.payment_style is self.POSTPAY:
year = bo.year - relativedelta(years=1)
if bp.month >= month:
year = bp.year + 1
bp = datetime.datetime(year=year, month=month, day=day,
tzinfo=timezone.get_current_timezone())
elif self.billing_period is self.NEVER:
bp = order.registered_on
else:
raise NotImplementedError(
"Support for '%s' billing period and '%s' billing point is not implemented"
% (self.display_billing_period(), self.display_billing_point())
)
if self.on_cancel is not self.NOTHING and order.cancelled_on < bp:
return order.cancelled_on
return bp
def get_pricing_size(self, ini, end):
rdelta = relativedelta.relativedelta(end, ini)
if self.get_pricing_period() is self.MONTHLY:
size = rdelta.months
days = calendar.monthrange(bp.year, bp.month)[1]
size += float(bp.day)/days
elif self.get_pricint_period() is self.ANUAL:
size = rdelta.years
size += float(rdelta.days)/365
elif self.get_pricing_period() is self.NEVER:
size = 1
else:
raise NotImplementedError
return size
def get_pricing_slots(self, ini, end):
period = self.get_pricing_period()
if period is self.MONTHLY:
rdelta = relativedelta(months=1)
elif period is self.ANUAL:
rdelta = relativedelta(years=1)
elif period is self.NEVER:
yield ini, end
raise StopIteration
else:
raise NotImplementedError
while True:
next = ini + rdelta
if next >= end:
yield ini, end
break
yield ini, next
ini = next
def create_line(self, order, price, size):
nominal_price = self.nominal_price * size
if nominal_price > price:
discount = nominal_price-price
def create_bill_lines(self, orders, **options):
# Perform compensations on cancelled services
# TODO WTF to do with day 1 of each month.
if self.on_cancel in (Order.COMPENSATE, Order.REFOUND):
# TODO compensations with commit=False, fuck commit or just fuck the transaction?
compensate(orders, **options)
# TODO create discount per compensation
bp = None
lines = []
for order in orders:
bp = self.get_billing_point(order, bp=bp, **options)
ini = order.billed_until or order.registered_on
if bp < ini:
continue
if not self.metric:
# Number of orders metric; bill line per order
porders = service.orders.filter(account=order.account).filter(
Q(is_active=True) | Q(cancelled_on__gt=order.billed_until)
).filter(registered_on__lt=bp)
price = 0
size = self.get_pricing_size(ini, bp)
if self.orders_effect is self.REGISTER_OR_RENEW:
events = get_register_or_renew_events(porders, ini, bp)
elif self.orders_effect is self.CONCURRENT:
events = get_register_or_cancel_events(porders, ini, bp)
else:
raise NotImplementedError
for metric, ratio in events:
price += self.get_rate(metric, account) * size * ratio
lines += self.create_line(order, price, size)
else:
# weighted metric; bill line per pricing period
for ini, end in self.get_pricing_slots(ini, bp):
metric = order.get_metric(ini, end)
size = self.get_pricing_size(ini, end)
price = self.get_rate(metric, account) * size
lines += self.create_line(order, price, size)
return lines
def compensate(self, orders):
# num orders and weights
# Discounts
pass