Add initial generate-bills and charge-negative-balance uncloud-pay

commands

uncloud/uncloud_pay/helpers.py

@@ -0,0 +1,12 @@
+from functools import reduce
+from .models import Bill, Payment
+
+def sum_amounts(entries):
+        return reduce(lambda acc, entry: acc + entry.amount, entries, 0)
+
+
+def get_balance_for(user):
+        bills = sum_amounts(Bill.objects.filter(owner=user))
+        payments = sum_amounts(Payment.objects.filter(owner=user))
+        return payments - bills
+

uncloud/uncloud_pay/management/commands/charge-negative-balance.py

@@ -0,0 +1,23 @@
+from django.core.management.base import BaseCommand
+from uncloud_auth.models import User
+from uncloud_pay.models import Order, Bill
+from uncloud_pay.helpers import get_balance_for
+
+from datetime import timedelta
+from django.utils import timezone
+
+class Command(BaseCommand):
+    help = 'Generate bills and charge customers if necessary.'
+
+    def add_arguments(self, parser):
+        pass
+
+    def handle(self, *args, **options):
+        users = User.objects.all()
+        print("Processing {} users.".format(users.count()))
+        for user in users:
+            balance = get_balance_for(user)
+            if balance < 0:
+                print("User {} has negative balance ({}), charging.".format(user.username, balance))
+                # TODO: charge
+        print("=> Done.")

uncloud/uncloud_pay/management/commands/generate-bills.py

@@ -0,0 +1,48 @@
+from django.core.management.base import BaseCommand
+from uncloud_auth.models import User
+from uncloud_pay.models import Order, Bill
+
+from datetime import timedelta
+from django.utils import timezone
+
+class Command(BaseCommand):
+    help = 'Generate bills and charge customers if necessary.'
+
+    def add_arguments(self, parser):
+        pass
+
+    # TODO: check for existing bills
+    def handle(self, *args, **options):
+        customers = User.objects.all()
+        print("Processing {} users.".format(customers.count()))
+        for customer in customers:
+            orders = Order.objects.filter(owner=customer)
+
+            # Pay all non-billed usage untill now.
+            bill_starting_date = timezone.now()
+            bill_ending_date = timezone.now()
+
+            billed_orders = []
+            for order in orders:
+                print(order)
+                if True: # FIXME
+                    billed_orders.append(order)
+
+                    # Update starting date if need be.
+                    if order.starting_date < bill_starting_date:
+                        bill_starting_date = order.starting_date
+
+            if len(billed_orders) > 0:
+              bill = Bill(owner=customer,
+                       starting_date=bill_starting_date,
+                       ending_date=bill_starting_date,
+                       due_date=timezone.now() + timedelta(days=10))
+              bill.save()
+
+              for order in billed_orders:
+                  print(order)
+                  order.bill.add(bill)
+
+              print("Created bill {} for user {}".format(bill.uuid, customer.username))
+
+        print("=> Done.")

uncloud/uncloud_pay/migrations/0005_auto_20200228_0737.py

@@ -0,0 +1,42 @@
+# Generated by Django 3.0.3 on 2020-02-28 07:37
+
+from django.db import migrations, models
+import uuid
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0004_auto_20200227_1532'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='bill',
+            name='id',
+        ),
+        migrations.RemoveField(
+            model_name='bill',
+            name='paid',
+        ),
+        migrations.AddField(
+            model_name='bill',
+            name='uuid',
+            field=models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False),
+        ),
+        migrations.AlterField(
+            model_name='bill',
+            name='creation_date',
+            field=models.DateTimeField(auto_now_add=True),
+        ),
+        migrations.AlterField(
+            model_name='order',
+            name='creation_date',
+            field=models.DateTimeField(auto_now_add=True),
+        ),
+        migrations.AlterField(
+            model_name='order',
+            name='starting_date',
+            field=models.DateTimeField(auto_now_add=True),
+        ),
+    ]

uncloud/uncloud_pay/migrations/0006_auto_20200228_0741.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.3 on 2020-02-28 07:41
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0005_auto_20200228_0737'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='order',
+            name='bill',
+            field=models.ManyToManyField(blank=True, editable=False, to='uncloud_pay.Bill'),
+        ),
+    ]

uncloud/uncloud_pay/migrations/0007_remove_order_bill.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.0.3 on 2020-02-28 07:44
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0006_auto_20200228_0741'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='order',
+            name='bill',
+        ),
+    ]

uncloud/uncloud_pay/migrations/0008_order_bill.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.3 on 2020-02-28 07:44
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0007_remove_order_bill'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='order',
+            name='bill',
+            field=models.ManyToManyField(blank=True, editable=False, to='uncloud_pay.Bill'),
+        ),
+    ]

uncloud/uncloud_pay/models.py

@@ -19,21 +19,26 @@ class RecurringPeriod(models.TextChoices):
     PER_SECOND = 'SECOND', _('Per Second')
 
 class Bill(models.Model):
+    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     owner = models.ForeignKey(get_user_model(),
             on_delete=models.CASCADE)
 
-    creation_date = models.DateTimeField()
+    creation_date = models.DateTimeField(auto_now_add=True)
     starting_date = models.DateTimeField()
     ending_date = models.DateTimeField()
     due_date = models.DateField()
 
-    paid = models.BooleanField(default=False)
     valid = models.BooleanField(default=True)
 
     @property
     def amount(self):
-        # iterate over all related orders
-        return 20
+        orders = Order.objects.filter(bill=self)
+        amount = 0
+        for order in orders:
+            amount += order.recurring_price
+
+        return amount
+
 
 
 class Order(models.Model):
@@ -49,8 +54,7 @@ class Order(models.Model):
 
     bill = models.ManyToManyField(Bill,
                                   editable=False,
-                                  blank=True,
-                                  null=True)
+                                  blank=True)
 
 
     recurring_price = models.FloatField(editable=False)

uncloud/uncloud_pay/serializers.py

@@ -1,6 +1,7 @@
 from django.contrib.auth import get_user_model
 from rest_framework import serializers
 from .models import *
+from .helpers import get_balance_for
 
 from functools import reduce
 from uncloud_vm.serializers import VMProductSerializer
@@ -10,7 +11,7 @@ class BillSerializer(serializers.ModelSerializer):
     class Meta:
         model = Bill
         fields = ['owner', 'amount', 'due_date', 'creation_date',
-                'starting_date', 'ending_date', 'paid']
+                'starting_date', 'ending_date']
 
 class PaymentSerializer(serializers.ModelSerializer):
     class Meta:
@@ -41,8 +42,4 @@ class UserSerializer(serializers.ModelSerializer):
         return reduce(lambda acc, entry: acc + entry.amount, entries, 0)
 
     def get_balance(self, user):
-        bills = self.__sum_balance(Bill.objects.filter(owner=user))
-        payments = self.__sum_balance(Payment.objects.filter(owner=user))
-        balance = payments - bills
-
-        return balance
+        return get_balance_for(user)