663 lines
29 KiB
Python
663 lines
29 KiB
Python
import calendar
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import datetime
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import decimal
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import math
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from functools import cmp_to_key
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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.core.exceptions import ValidationError
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from django.utils import timezone, translation
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from django.utils.translation import gettext, gettext_lazy as _
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from orchestra import plugins
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from orchestra.utils.humanize import text2int
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from orchestra.utils.python import AttrDict, format_exception
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from . import settings, helpers
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class ServiceHandler(plugins.Plugin, metaclass=plugins.PluginMount):
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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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Relax and enjoy the journey.
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"""
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_PLAN = 'plan'
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_COMPENSATION = 'compensation'
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_PREPAY = 'prepay'
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model = None
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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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if attr.startswith('__'):
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raise AttributeError(f'{self} does not have attribute {attr}')
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return getattr(self.service, attr)
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@classmethod
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def get_choices(cls):
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choices = super().get_choices()
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return [('', _("Default"))] + choices
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def validate_content_type(self, service):
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pass
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def validate_expression(self, service, method):
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try:
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obj = service.content_type.model_class().objects.all()[0]
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except IndexError:
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return
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try:
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bool(getattr(self, method)(obj))
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except Exception as exc:
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raise ValidationError(format_exception(exc))
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def validate_match(self, service):
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if not service.match:
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service.match = 'True'
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self.validate_expression(service, 'matches')
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def validate_metric(self, service):
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self.validate_expression(service, 'get_metric')
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def validate_order_description(self, service):
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self.validate_expression(service, 'get_order_description')
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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 get_expression_context(self, instance):
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return {
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'instance': instance,
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'obj': instance,
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'gettext': gettext,
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'handler': self,
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'service': self.service,
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instance._meta.model_name: instance,
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'math': math,
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'logsteps': lambda n, size=1: \
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round(n/(decimal.Decimal(size*10**int(math.log10(max(n, 1))))))*size*10**int(math.log10(max(n, 1))),
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'log10': math.log10,
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'Decimal': decimal.Decimal,
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}
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def matches(self, instance):
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if not self.match:
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# Blank expressions always evaluate True
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return True
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safe_locals = self.get_expression_context(instance)
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return eval(self.match, safe_locals)
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def get_ignore_delta(self):
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if self.ignore_period == self.NEVER:
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return None
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value, unit = self.ignore_period.split('_')
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value = text2int(value)
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if unit.lower().startswith('day'):
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return datetime.timedelta(days=value)
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if unit.lower().startswith('month'):
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return datetime.timedelta(months=value)
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else:
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raise ValueError("Unknown unit %s" % unit)
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def get_order_ignore(self, order):
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""" service trial delta """
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ignore_delta = self.get_ignore_delta()
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if ignore_delta and (order.cancelled_on-ignore_delta).date() <= order.registered_on:
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return True
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return order.ignore
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def get_ignore(self, instance):
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if self.ignore_superusers:
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account = getattr(instance, 'account', instance)
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if account.type in settings.SERVICES_IGNORE_ACCOUNT_TYPE:
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return True
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if 'superuser' in settings.SERVICES_IGNORE_ACCOUNT_TYPE and account.is_superuser:
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return True
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return False
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def get_metric(self, instance):
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if self.metric:
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safe_locals = self.get_expression_context(instance)
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try:
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return eval(self.metric, safe_locals)
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except Exception as exc:
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raise type(exc)("'%s' evaluating metric for '%s' service" % (exc, self.service))
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def get_order_description(self, instance):
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safe_locals = self.get_expression_context(instance)
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account = getattr(instance, 'account', instance)
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with translation.override(account.language):
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if not self.order_description:
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return '%s: %s' % (gettext(self.description), instance)
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return eval(self.order_description, safe_locals)
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def get_billing_point(self, order, bp=None, **options):
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cachable = bool(self.billing_point == self.FIXED_DATE and not options.get('fixed_point'))
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if not cachable or bp is None:
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bp = options.get('billing_point') or 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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else:
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date = timezone.now().date()
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if self.billing_point == self.ON_REGISTER:
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# handle edge cases of last day of the month:
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# e.g. on March is 31 but on April 30
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last_day_of_month = calendar.monthrange(date.year, date.month)[1]
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day = min(last_day_of_month, 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.date(year=date.year, month=date.month, day=day)
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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 = bp.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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# handle edge cases of last day of the month:
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# e.g. on March is 31 but on April 30
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last_day_of_month = calendar.monthrange(year,month)[1]
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day = min(last_day_of_month, day)
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bp = datetime.date(year=year, month=month, day=day)
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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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bp = order.cancelled_on
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return bp
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# def aligned(self, date):
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# if self.granularity == self.DAILY:
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# return date
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# elif self.granularity == self.MONTHLY:
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# return datetime.date(year=date.year, month=date.month, day=1)
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# elif self.granularity == self.ANUAL:
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# return datetime.date(year=date.year, month=1, day=1)
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# raise NotImplementedError
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def get_price_size(self, ini, end):
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rdelta = relativedelta.relativedelta(end, ini)
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anual_prepay_of_monthly_pricing = bool(
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self.billing_period == self.ANUAL and
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self.payment_style == self.PREPAY and
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self.get_pricing_period() == self.MONTHLY)
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if self.billing_period == self.MONTHLY or anual_prepay_of_monthly_pricing:
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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(str(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(str(rdelta.months))/12
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days = 366 if calendar.isleap(end.year) else 365
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size += decimal.Decimal(str(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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size = round(size, 2)
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return decimal.Decimal(str(size))
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def get_pricing_slots(self, ini, end):
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day = 1
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month = settings.SERVICES_SERVICE_ANUAL_BILLING_MONTH
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if self.billing_point == self.ON_REGISTER:
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day = ini.day
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month = ini.month
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period = self.get_pricing_period()
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rdelta = self.get_pricing_rdelta()
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if period == self.MONTHLY:
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ini = datetime.date(year=ini.year, month=ini.month, day=day)
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elif period == self.ANUAL:
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ini = datetime.date(year=ini.year, month=month, day=day)
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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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yield ini, next
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if next >= end:
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break
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ini = next
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def get_pricing_rdelta(self):
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period = self.get_pricing_period()
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if period == self.MONTHLY:
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return relativedelta.relativedelta(months=1)
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elif period == self.ANUAL:
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return relativedelta.relativedelta(years=1)
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elif period == self.NEVER:
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return None
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def generate_discount(self, line, dtype, price):
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line.discounts.append(AttrDict(**{
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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, *dates, metric=1, discounts=None, computed=False):
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"""
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discounts: extra discounts to apply
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computed: price = price*size already performed
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"""
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if len(dates) == 2:
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ini, end = dates
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elif len(dates) == 1:
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ini, end = dates[0], dates[0]
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else:
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raise AttributeError("WTF is '%s'?" % dates)
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discounts = discounts or ()
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size = self.get_price_size(ini, end)
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if not computed:
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price = price * size
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subtotal = self.nominal_price * size * metric
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line = AttrDict(**{
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'order': order,
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'subtotal': subtotal,
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'ini': ini,
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'end': end,
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'size': size,
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'metric': metric,
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'discounts': [],
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})
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if subtotal > price:
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plan_discount = price-subtotal
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self.generate_discount(line, self._PLAN, plan_discount)
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subtotal += plan_discount
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for dtype, dprice in discounts:
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subtotal += dprice
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# Prevent compensations/prepays to refund money
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if dtype in (self._COMPENSATION, self._PREPAY) and subtotal < 0:
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dprice -= subtotal
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if dprice:
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self.generate_discount(line, dtype, dprice)
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return line
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def assign_compensations(self, givers, receivers, **options):
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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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interval = helpers.Interval(ini, end)
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compensations, used_compensations = helpers.compensate(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.ini,
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getattr(comp.order, 'new_billed_until', datetime.date.max))
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if options.get('commit', True):
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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(update_fields=['billed_until'])
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def apply_compensations(self, order, only_beyond=False):
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dsize = 0
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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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beyond = end
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cend = None
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new_end = None
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for comp in getattr(order, '_compensations', []):
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intersect = comp.intersect(helpers.Interval(ini=ini, end=end))
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if intersect:
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cini, cend = intersect.ini, intersect.end
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if comp.end > beyond:
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cend = comp.end
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new_end = cend
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if only_beyond:
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cini = beyond
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elif only_beyond:
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continue
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dsize += self.get_price_size(cini, cend)
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# Extend billing point a little bit to benefit from a substantial discount
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elif comp.end > beyond and (comp.end-comp.ini).days > 3*(comp.ini-beyond).days:
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cend = comp.end
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new_end = cend
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dsize += self.get_price_size(comp.ini, cend)
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return dsize, new_end
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def get_register_or_renew_events(self, porders, ini, end):
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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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registered = order.registered_on
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if registered > ini and registered <= end:
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counter += 1
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if registered != 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 registered != 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):
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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, start=1):
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csize = 0
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compensations = getattr(order, '_compensations', [])
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# Compensations < new_billed_until
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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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cprice = price * csize
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price = price * size
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if order in priced:
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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.items():
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if hasattr(order, 'new_billed_until'):
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discounts = ()
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# Generate lines and discounts from order.nominal_price
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price, cprice = prices
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a = order.id
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# Compensations > new_billed_until
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dsize, new_end = self.apply_compensations(order, only_beyond=True)
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cprice += dsize*price
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if cprice:
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discounts = (
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(self._COMPENSATION, -cprice),
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)
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if new_end:
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size = self.get_price_size(order.new_billed_until, new_end)
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price += price*size
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order.new_billed_until = new_end
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ini = order.billed_until or order.registered_on
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end = new_end or order.new_billed_until
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line = self.generate_line(
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order, price, ini, end, discounts=discounts, computed=True)
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lines.append(line)
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return lines
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def bill_registered_or_renew_events(self, account, porders, rates):
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# Before registration
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lines = []
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rdelta = self.get_pricing_rdelta()
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if not rdelta:
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raise NotImplementedError
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for position, order in enumerate(porders, start=1):
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if hasattr(order, 'new_billed_until'):
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pend = order.billed_until or order.registered_on
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pini = pend - rdelta
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metric = self.get_register_or_renew_events(porders, pini, pend)
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position = min(position, metric)
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price = self.get_price(account, metric, position=position, rates=rates)
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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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discounts = ()
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dsize, new_end = self.apply_compensations(order)
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if dsize:
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discounts=(
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(self._COMPENSATION, -dsize*price),
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)
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if new_end:
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order.new_billed_until = new_end
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end = new_end
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line = self.generate_line(order, price, ini, end, discounts=discounts)
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lines.append(line)
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return lines
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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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# boundary lookup and exclude cancelled and billed
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orders_ = []
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bp = None
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ini = datetime.date.max
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end = datetime.date.min
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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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# exclude cancelled and billed
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if self.on_cancel != self.REFUND:
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if order.cancelled_on and order.billed_until > order.cancelled_on:
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continue
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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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if order.billed_until and order.billed_until >= bp:
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continue
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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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orders_.append(order)
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orders = orders_
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# Compensation
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related_orders = account.orders.filter(service=self.service)
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if self.payment_style == self.PREPAY and self.on_cancel == self.COMPENSATE:
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# Get orders pending for compensation
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givers = list(related_orders.givers(ini, end))
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givers = sorted(givers, key=cmp_to_key(helpers.cmp_billed_until_or_registered_on))
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orders = sorted(orders, key=cmp_to_key(helpers.cmp_billed_until_or_registered_on))
|
|
self.assign_compensations(givers, orders, **options)
|
|
rates = self.get_rates(account)
|
|
has_billing_period = self.billing_period != self.NEVER
|
|
has_pricing_period = self.get_pricing_period() != self.NEVER
|
|
if rates and (has_billing_period or has_pricing_period):
|
|
concurrent = has_billing_period and not has_pricing_period
|
|
if not concurrent:
|
|
rdelta = self.get_pricing_rdelta()
|
|
ini -= rdelta
|
|
porders = related_orders.pricing_orders(ini, end)
|
|
porders = list(set(orders).union(set(porders)))
|
|
porders = sorted(porders, key=cmp_to_key(helpers.cmp_billed_until_or_registered_on))
|
|
if concurrent:
|
|
# Periodic billing with no pricing period
|
|
lines = self.bill_concurrent_orders(account, porders, rates, ini, end)
|
|
else:
|
|
# Periodic and one-time billing with pricing period
|
|
lines = self.bill_registered_or_renew_events(account, porders, rates)
|
|
else:
|
|
# No rates optimization or one-time billing without pricing period
|
|
lines = []
|
|
price = self.nominal_price
|
|
# Calculate nominal price
|
|
for order in orders:
|
|
ini = order.billed_until or order.registered_on
|
|
end = order.new_billed_until
|
|
discounts = ()
|
|
dsize, new_end = self.apply_compensations(order)
|
|
if dsize:
|
|
discounts=(
|
|
(self._COMPENSATION, -dsize*price),
|
|
)
|
|
if new_end:
|
|
order.new_billed_until = new_end
|
|
end = new_end
|
|
line = self.generate_line(order, price, ini, end, discounts=discounts)
|
|
lines.append(line)
|
|
return lines
|
|
|
|
def bill_with_metric(self, orders, account, **options):
|
|
lines = []
|
|
bp = None
|
|
for order in orders:
|
|
prepay_discount = 0
|
|
bp = self.get_billing_point(order, bp=bp, **options)
|
|
recharged_until = datetime.date.min
|
|
|
|
if (self.billing_period != self.NEVER and
|
|
self.get_pricing_period() == self.NEVER and
|
|
self.payment_style == self.PREPAY and order.billed_on):
|
|
# Recharge
|
|
if self.payment_style == self.PREPAY and order.billed_on:
|
|
recharges = []
|
|
rini = order.billed_on
|
|
rend = min(bp, order.billed_until)
|
|
bmetric = order.billed_metric
|
|
if bmetric is None:
|
|
bmetric = order.get_metric(order.billed_on)
|
|
bsize = self.get_price_size(rini, rend)
|
|
prepay_discount = self.get_price(account, bmetric) * bsize
|
|
prepay_discount = round(prepay_discount, 2)
|
|
for cini, cend, metric in order.get_metric(rini, rend, changes=True):
|
|
cini = max(cini, rini)
|
|
size = self.get_price_size(cini, cend)
|
|
price = self.get_price(account, metric) * size
|
|
discounts = ()
|
|
discount = min(price, max(prepay_discount, 0))
|
|
prepay_discount -= price
|
|
if discount > 0:
|
|
price -= discount
|
|
discounts = (
|
|
(self._PREPAY, -discount),
|
|
)
|
|
# Don't overdload bills with lots of lines
|
|
if price > 0:
|
|
recharges.append((order, price, cini, cend, metric, discounts))
|
|
if prepay_discount < 0:
|
|
# User has prepaid less than the actual consumption
|
|
for order, price, cini, cend, metric, discounts in recharges:
|
|
if discounts:
|
|
price -= discounts[0][1]
|
|
line = self.generate_line(order, price, cini, cend, metric=metric,
|
|
computed=True, discounts=discounts)
|
|
lines.append(line)
|
|
recharged_until = cend
|
|
if order.billed_until and order.cancelled_on and order.cancelled_on >= order.billed_until:
|
|
# Cancelled order
|
|
continue
|
|
if self.billing_period != self.NEVER:
|
|
ini = order.billed_until or order.registered_on
|
|
# ini = max(order.billed_until or order.registered_on, recharged_until)
|
|
# Periodic billing
|
|
if bp <= ini:
|
|
# Already billed
|
|
continue
|
|
order.new_billed_until = bp
|
|
if self.get_pricing_period() == self.NEVER:
|
|
# Changes (Mailbox disk-like)
|
|
for cini, cend, metric in order.get_metric(ini, bp, changes=True):
|
|
cini = max(recharged_until, cini)
|
|
price = self.get_price(account, metric)
|
|
discounts = ()
|
|
# Since the current datamodel can't guarantee to retrieve the exact
|
|
# state for calculating prepay_discount (service price could have change)
|
|
# maybe is it better not to discount anything.
|
|
# discount = min(price, max(prepay_discount, 0))
|
|
# if discount > 0:
|
|
# price -= discount
|
|
# prepay_discount -= discount
|
|
# discounts = (
|
|
# (self._PREPAY, -discount),
|
|
# )
|
|
if metric > 0:
|
|
line = self.generate_line(order, price, cini, cend, metric=metric,
|
|
discounts=discounts)
|
|
lines.append(line)
|
|
elif self.get_pricing_period() == self.billing_period:
|
|
# pricing_slots (Traffic-like)
|
|
if self.payment_style == self.PREPAY:
|
|
raise NotImplementedError(
|
|
"Metric with prepay and pricing_period == billing_period")
|
|
for cini, cend in self.get_pricing_slots(ini, bp):
|
|
metric = order.get_metric(cini, cend)
|
|
price = self.get_price(account, metric)
|
|
discounts = ()
|
|
# discount = min(price, max(prepay_discount, 0))
|
|
# if discount > 0:
|
|
# price -= discount
|
|
# prepay_discount -= discount
|
|
# discounts = (
|
|
# (self._PREPAY, -discount),
|
|
# )
|
|
if metric > 0:
|
|
line = self.generate_line(order, price, cini, cend, metric=metric,
|
|
discounts=discounts)
|
|
lines.append(line)
|
|
elif self.get_pricing_period() in (self.MONTHLY, self.ANUAL):
|
|
if self.payment_style == self.PREPAY:
|
|
# Traffic Prepay
|
|
metric = order.get_metric(timezone.now().date())
|
|
if metric > 0:
|
|
price = self.get_price(account, metric)
|
|
for cini, cend in self.get_pricing_slots(ini, bp):
|
|
line = self.generate_line(order, price, cini, cend, metric=metric)
|
|
lines.append(line)
|
|
else:
|
|
raise NotImplementedError(
|
|
"Metric with postpay and pricing_period in (monthly, anual)")
|
|
else:
|
|
raise NotImplementedError
|
|
else:
|
|
# One-time billing
|
|
if order.billed_until:
|
|
continue
|
|
date = timezone.now().date()
|
|
order.new_billed_until = date
|
|
if self.get_pricing_period() == self.NEVER:
|
|
# get metric (Job-like)
|
|
metric = order.get_metric(date)
|
|
price = self.get_price(account, metric)
|
|
line = self.generate_line(order, price, date, metric=metric)
|
|
lines.append(line)
|
|
else:
|
|
raise NotImplementedError
|
|
# Last processed metric for futrue recharges
|
|
order.new_billed_metric = metric
|
|
return lines
|
|
|
|
def generate_bill_lines(self, orders, account, **options):
|
|
if options.get('proforma', False):
|
|
options['commit'] = False
|
|
if not self.metric:
|
|
lines = self.bill_with_orders(orders, account, **options)
|
|
else:
|
|
lines = self.bill_with_metric(orders, account, **options)
|
|
if options.get('commit', True):
|
|
now = timezone.now().date()
|
|
for line in lines:
|
|
order = line.order
|
|
order.billed_on = now
|
|
order.billed_metric = getattr(order, 'new_billed_metric', order.billed_metric)
|
|
order.billed_until = getattr(order, 'new_billed_until', order.billed_until)
|
|
order.save(update_fields=('billed_on', 'billed_until', 'billed_metric'))
|
|
return lines
|