252 lines
11 KiB
Python
252 lines
11 KiB
Python
import decimal
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from django.contrib.contenttypes.models import ContentType
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from django.db import models
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from django.apps import apps
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from django.utils.functional import cached_property
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from django.utils.module_loading import autodiscover_modules
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from django.utils.translation import string_concat, ugettext_lazy as _
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from orchestra.core import caches, validators
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from orchestra.utils.python import import_class
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from . import settings
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from .handlers import ServiceHandler
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autodiscover_modules('handlers')
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rate_class = import_class(settings.SERVICES_RATE_CLASS)
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class Service(models.Model):
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NEVER = ''
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# DAILY = 'DAILY'
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MONTHLY = 'MONTHLY'
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ANUAL = 'ANUAL'
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ONE_DAY = 'ONE_DAY'
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TWO_DAYS = 'TWO_DAYS'
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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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COMPENSATE = 'COMPENSATE'
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REFUND = 'REFUND'
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PREPAY = 'PREPAY'
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POSTPAY = 'POSTPAY'
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_ignore_types = ' and '.join(', '.join(settings.SERVICES_IGNORE_ACCOUNT_TYPE).rsplit(', ', 1)).lower()
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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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help_text=_("Content type of the related service objects."))
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match = models.CharField(_("match"), max_length=256, blank=True,
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help_text=_(
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"Python <a href='https://docs.python.org/2/library/functions.html#eval'>expression</a> "
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"that designates wheter a <tt>content_type</tt> object is related to this service "
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"or not, always evaluates <tt>True</tt> when left blank. "
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"Related instance can be instantiated with <tt>instance</tt> keyword or "
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"<tt>content_type.model_name</tt>.</br>"
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"<tt> databaseuser.type == 'MYSQL'</tt><br>"
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"<tt> miscellaneous.active and str(miscellaneous.identifier).endswith(('.org', '.net', '.com'))</tt><br>"
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"<tt> contractedplan.plan.name == 'association_fee''</tt><br>"
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"<tt> instance.active</tt>"))
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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_choices())
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is_active = models.BooleanField(_("active"), default=True)
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ignore_superusers = models.BooleanField(_("ignore %s") % _ignore_types, default=True,
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help_text=_("Designates whether %s orders are marked as ignored by default or not.") % _ignore_types)
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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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is_fee = models.BooleanField(_("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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order_description = models.CharField(_("Order description"), max_length=128, blank=True,
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help_text=_(
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"Python <a href='https://docs.python.org/2/library/functions.html#eval'>expression</a> "
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"used for generating the description for the bill lines of this services.<br>"
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"Defaults to <tt>'%s: %s' % (ugettext(handler.description), instance)</tt>"
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))
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ignore_period = models.CharField(_("ignore period"), max_length=16, blank=True,
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help_text=_("Period in which orders will be ignored if cancelled. "
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"Useful for designating <i>trial periods</i>"),
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choices=(
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(NEVER, _("Never")),
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(ONE_DAY, _("One day")),
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(TWO_DAYS, _("Two days")),
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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=settings.SERVICES_DEFAULT_IGNORE_PERIOD)
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# Pricing
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metric = models.CharField(_("metric"), max_length=256, blank=True,
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help_text=_(
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"Python <a href='https://docs.python.org/2/library/functions.html#eval'>expression</a> "
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"used for obtinging the <i>metric value</i> for the pricing rate computation. "
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"Number of orders is used when left blank. Related instance can be instantiated "
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"with <tt>instance</tt> keyword or <tt>content_type.model_name</tt>.<br>"
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"<tt> max((mailbox.resources.disk.allocated or 0) -1, 0)</tt><br>"
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"<tt> miscellaneous.amount</tt><br>"
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"<tt> max((account.resources.traffic.used or 0) -"
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" getattr(account.miscellaneous.filter(is_active=True,"
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" service__name='traffic-prepay').last(), 'amount', 0), 0)</tt>"))
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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.SERVICES_SERVICE_TAXES,
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default=settings.SERVICES_SERVICE_DEFAULT_TAX)
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pricing_period = models.CharField(_("pricing period"), max_length=16, blank=True,
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help_text=_("Time period that is used for computing the rate metric."),
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choices=(
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(NEVER, _("Current value")),
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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=64,
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choices=rate_class.get_choices(),
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default=rate_class.get_default(),
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help_text=string_concat(_("Algorithm used to interprete the rating table."), *[
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string_concat('<br> ', method.verbose_name, ': ', method.help_text)
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for name, method in rate_class.get_methods().items()
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]))
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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, _("Compensat")),
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(REFUND, _("Refund")),
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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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def __str__(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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key = 'services.Service-%i' % ct.pk
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services = cache.get(key)
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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(key, services)
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return services
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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(self.handler_type)(self)
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return ServiceHandler(self)
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def clean(self):
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self.description = self.description.strip()
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if hasattr(self, 'content_type'):
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validators.all_valid({
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'content_type': (self.handler.validate_content_type, self),
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'match': (self.handler.validate_match, self),
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'metric': (self.handler.validate_metric, self),
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'order_description': (self.handler.validate_order_description, self),
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})
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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, account, metric, rates=None, 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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if rates is None:
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rates = self.get_rates(account)
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if rates:
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rates = self.rate_method(rates, metric)
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if not rates:
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rates = [{
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'quantity': metric,
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'price': self.nominal_price,
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}]
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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 decimal.Decimal(str(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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if metric < position:
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raise ValueError("Metric can not be less than the position.")
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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 decimal.Decimal(str(rate['price']))
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def get_rates(self, account, cache=True):
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# rates are cached per account
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if not cache:
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return self.rates.by_account(account)
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if not hasattr(self, '__cached_rates'):
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self.__cached_rates = {}
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try:
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return self.__cached_rates[account.id]
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except KeyError:
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rates = self.rates.by_account(account)
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self.__cached_rates[account.id] = rates
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return rates
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@property
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def rate_method(self):
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return rate_class.get_methods()[self.rate_algorithm]
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def update_orders(self, commit=True):
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order_model = apps.get_model(settings.SERVICES_ORDER_MODEL)
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related_model = self.content_type.model_class()
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updates = []
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queryset = related_model.objects.all()
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if related_model._meta.model_name != 'account':
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queryset = queryset.select_related('account').all()
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for instance in queryset:
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updates += order_model.update_orders(instance, service=self, commit=commit)
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return updates
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