349 lines
14 KiB
Python
349 lines
14 KiB
Python
import calendar
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import datetime
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import decimal
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from dateutil import relativedelta
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from django.contrib.contenttypes.models import ContentType
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from django.db.models import Q
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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.utils import plugins
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from orchestra.utils.python import AttributeDict
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from . import settings, helpers
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class ServiceHandler(plugins.Plugin):
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"""
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Separates all the logic of billing handling from the model allowing to better
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customize its behaviout
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"""
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model = None
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__metaclass__ = plugins.PluginMount
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def __init__(self, service):
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self.service = service
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def __getattr__(self, attr):
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return getattr(self.service, attr)
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@classmethod
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def get_plugin_choices(cls):
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choices = super(ServiceHandler, cls).get_plugin_choices()
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return [('', _("Default"))] + choices
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def get_content_type(self):
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if not self.model:
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return self.content_type
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app_label, model = self.model.split('.')
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return ContentType.objects.get_by_natural_key(app_label, model.lower())
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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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def get_metric(self, instance):
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if self.metric:
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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.metric, safe_locals)
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def get_billing_point(self, order, bp=None, **options):
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not_cachable = self.billing_point == self.FIXED_DATE and options.get('fixed_point')
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if not_cachable or bp is None:
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bp = options.get('billing_point', timezone.now().date())
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if not options.get('fixed_point'):
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msg = ("Support for '%s' period and '%s' point is not implemented"
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% (self.get_billing_period_display(), self.get_billing_point_display()))
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if self.billing_period == self.MONTHLY:
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date = bp
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if self.payment_style == self.PREPAY:
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date += relativedelta.relativedelta(months=1)
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if self.billing_point == self.ON_REGISTER:
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day = order.registered_on.day
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elif self.billing_point == self.FIXED_DATE:
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day = 1
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else:
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raise NotImplementedError(msg)
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bp = datetime.datetime(year=date.year, month=date.month, day=day,
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tzinfo=timezone.get_current_timezone()).date()
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elif self.billing_period == self.ANUAL:
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if self.billing_point == self.ON_REGISTER:
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month = order.registered_on.month
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day = order.registered_on.day
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elif self.billing_point == self.FIXED_DATE:
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month = settings.SERVICES_SERVICE_ANUAL_BILLING_MONTH
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day = 1
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else:
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raise NotImplementedError(msg)
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year = bp.year
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if self.payment_style == self.POSTPAY:
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year = bo.year - relativedelta.relativedelta(years=1)
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if bp.month >= month:
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year = bp.year + 1
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bp = datetime.datetime(year=year, month=month, day=day,
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tzinfo=timezone.get_current_timezone()).date()
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elif self.billing_period == self.NEVER:
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bp = order.registered_on
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else:
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raise NotImplementedError(msg)
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if self.on_cancel != self.NOTHING and order.cancelled_on and order.cancelled_on < bp:
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return order.cancelled_on
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return bp
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def get_price_size(self, ini, end):
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rdelta = relativedelta.relativedelta(end, ini)
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if self.billing_period == self.MONTHLY:
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size = rdelta.years * 12
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size += rdelta.months
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days = calendar.monthrange(end.year, end.month)[1]
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size += decimal.Decimal(rdelta.days)/days
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elif self.billing_period == self.ANUAL:
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size = rdelta.years
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size += decimal.Decimal(rdelta.months)/12
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days = 366 if calendar.isleap(end.year) else 365
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size += decimal.Decimal(rdelta.days)/days
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elif self.billing_period == self.NEVER:
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size = 1
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else:
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raise NotImplementedError
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return decimal.Decimal(size)
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def get_pricing_slots(self, ini, end):
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period = self.get_pricing_period()
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if period == self.MONTHLY:
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rdelta = relativedelta.relativedelta(months=1)
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elif period == self.ANUAL:
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rdelta = relativedelta.relativedelta(years=1)
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elif period == self.NEVER:
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yield ini, end
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raise StopIteration
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else:
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raise NotImplementedError
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while True:
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next = ini + rdelta
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if next >= end:
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yield ini, end
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break
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yield ini, next
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ini = next
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def generate_discount(self, line, dtype, price):
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line.discounts.append(AttributeDict(**{
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'type': dtype,
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'total': price,
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}))
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def generate_line(self, order, price, size, ini, end, discounts=[]):
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subtotal = self.nominal_price * size
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line = AttributeDict(**{
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'order': order,
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'subtotal': subtotal,
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'size': size,
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'ini': ini,
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'end': end,
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'discounts': [],
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})
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discounted = 0
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for dtype, dprice in discounts:
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self.generate_discount(line, dtype, dprice)
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discounted += dprice
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subtotal -= discounted
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if subtotal > price:
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self.generate_discount(line, 'volume', price-subtotal)
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return line
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def compensate(self, givers, receivers, commit=True):
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compensations = []
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for order in givers:
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if order.billed_until and order.cancelled_on and order.cancelled_on < order.billed_until:
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interval = helpers.Interval(order.cancelled_on, order.billed_until, order)
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compensations.append[interval]
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for order in receivers:
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if not order.billed_until or order.billed_until < order.new_billed_until:
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# receiver
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ini = order.billed_until or order.registered_on
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end = order.cancelled_on or datetime.date.max
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order_interval = helpers.Interval(ini, order.new_billed_until)
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compensations, used_compensations = helpers.compensate(order_interval, compensations)
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order._compensations = used_compensations
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for comp in used_compensations:
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comp.order.new_billed_until = min(comp.order.billed_until, comp.end)
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if commit:
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for order in givers:
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if hasattr(order, 'new_billed_until'):
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order.billed_until = order.new_billed_until
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order.save()
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def get_register_or_renew_events(self, porders, ini, end):
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# TODO count intermediat billing points too
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counter = 0
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for order in porders:
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bu = getattr(order, 'new_billed_until', order.billed_until)
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if bu:
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if order.register >= ini and order.register < end:
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counter += 1
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if order.register != bu and bu >= ini and bu < end:
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counter += 1
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if order.billed_until and order.billed_until != bu:
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if order.register != order.billed_until and order.billed_until >= ini and order.billed_until < end:
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counter += 1
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return counter
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def bill_concurrent_orders(self, account, porders, rates, ini, end, commit=True):
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# Concurrent
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# Get pricing orders
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priced = {}
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for ini, end, orders in helpers.get_chunks(porders, ini, end):
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size = self.get_price_size(ini, end)
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metric = len(orders)
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interval = helpers.Interval(ini=ini, end=end)
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for position, order in enumerate(orders):
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csize = 0
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compensations = getattr(order, '_compensations', [])
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for comp in compensations:
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intersect = comp.intersect(interval)
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if intersect:
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csize += self.get_price_size(intersect.ini, intersect.end)
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price = self.get_price(account, metric, position=position, rates=rates)
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price = price * size
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cprice = price * (size-csize)
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if order in prices:
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priced[order][0] += price
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priced[order][1] += cprice
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else:
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priced[order] = (price, cprice)
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lines = []
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for order, prices in priced.iteritems():
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# Generate lines and discounts from order.nominal_price
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price, cprice = prices
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if cprice:
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discounts = (('compensation', cprice),)
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line = self.generate_line(order, price, size, ini, end, discounts=discounts)
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lines.append(line)
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if commit:
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order.billed_until = order.new_billed_until
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order.save()
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return lines
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def bill_registered_or_renew_events(self, account, porders, rates, ini, end, commit=True):
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# Before registration
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lines = []
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perido = self.get_pricing_period()
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if period == self.MONTHLY:
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rdelta = relativedelta.relativedelta(months=1)
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elif period == self.ANUAL:
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rdelta = relativedelta.relativedelta(years=1)
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elif period == self.NEVER:
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raise NotImplementedError("Rates with no pricing period?")
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ini -= rdelta
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for position, order in enumerate(porders):
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if hasattr(order, 'new_billed_until'):
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cend = order.billed_until or order.registered_on
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cini = cend - rdelta
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metric = self.get_register_or_renew_events(porders, cini, cend)
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size = self.get_price_size(ini, end)
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price = self.get_price(account, metric, position=position, rates=rates)
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price = price * size
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line = self.generate_line(order, price, size, ini, end)
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lines.append(line)
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if commit:
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order.billed_until = order.new_billed_until
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order.save()
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def bill_with_orders(self, orders, account, **options):
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# For the "boundary conditions" just think that:
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# date(2011, 1, 1) is equivalent to datetime(2011, 1, 1, 0, 0, 0)
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# In most cases:
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# ini >= registered_date, end < registered_date
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bp = None
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lines = []
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commit = options.get('commit', True)
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ini = datetime.date.max
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end = datetime.date.min
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# boundary lookup
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for order in orders:
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cini = order.registered_on
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if order.billed_until:
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cini = order.billed_until
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bp = self.get_billing_point(order, bp=bp, **options)
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order.new_billed_until = bp
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ini = min(ini, cini)
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end = max(end, bp)
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related_orders = account.orders.filter(service=self.service)
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if self.on_cancel == self.COMPENSATE:
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# Get orders pending for compensation
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givers = related_orders.filter_givers(ini, end)
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givers.sort(cmp=helpers.cmp_billed_until_or_registered_on)
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orders.sort(cmp=helpers.cmp_billed_until_or_registered_on)
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self.compensate(givers, orders, commit=commit)
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rates = self.get_rates(account)
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if rates:
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porders = related_orders.filter_pricing_orders(ini, end)
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porders = list(set(orders).union(set(porders)))
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porders.sort(cmp=helpers.cmp_billed_until_or_registered_on)
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if self.billing_period != self.NEVER and self.get_pricing_period != self.NEVER:
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liens = self.bill_concurrent_orders(account, porders, rates, ini, end, commit=commit)
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else:
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lines = self.bill_registered_or_renew_events(account, porders, rates, ini, end, commit=commit)
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else:
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lines = []
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price = self.nominal_price
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# Calculate nominal price
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for order in orders:
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ini = order.billed_until or order.registered_on
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end = order.new_billed_until
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size = self.get_price_size(ini, end)
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order.nominal_price = price * size
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line = self.generate_line(order, price*size, size, ini, end)
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lines.append(line)
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if commit:
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order.billed_until = order.new_billed_until
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order.save()
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return lines
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def bill_with_metric(self, orders, account, **options):
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lines = []
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commit = options.get('commit', True)
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for order in orders:
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bp = self.get_billing_point(order, bp=bp, **options)
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ini = order.billed_until or order.registered_on
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if bp <= ini:
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continue
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order.new_billed_until = bp
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# weighted metric; bill line per pricing period
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prev = None
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lines_info = []
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for ini, end in self.get_pricing_slots(ini, bp):
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size = self.get_price_size(ini, end)
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metric = order.get_metric(ini, end)
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price = self.get_price(order, metric)
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current = AttributeDict(price=price, size=size, ini=ini, end=end)
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if prev and prev.metric == current.metric and prev.end == current.end:
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prev.end = current.end
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prev.size += current.size
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prev.price += current.price
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else:
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lines_info.append(current)
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prev = current
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for line in lines_info:
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lines.append(self.generate_line(order, price, size, ini, end))
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if commit:
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order.billed_until = order.new_billed_until
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order.save()
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return lines
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def generate_bill_lines(self, orders, account, **options):
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if not self.metric:
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lines = self.bill_with_orders(orders, account, **options)
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else:
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lines = self.bill_with_metric(orders, account, **options)
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return lines
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