710 lines
26 KiB
Python
710 lines
26 KiB
Python
import threading
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import time
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import uuid
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from datetime import timedelta
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from decimal import Decimal
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from cryptography.fernet import Fernet
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from django.contrib import admin
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from django.contrib.auth import get_user_model
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from django.core.exceptions import ValidationError
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from django.db import IntegrityError, OperationalError, connections, transaction
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from django.test import TestCase, TransactionTestCase, override_settings
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from django.utils import timezone
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from apps.ai.models import AiModel, ModelAlias
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from apps.billing.models import (
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CallRecord,
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ExchangeRate,
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PointsLedger,
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PricingRule,
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RechargeOrder,
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)
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from apps.billing.pricing import (
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NoPricingRuleError,
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calculate_points_cost,
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calculate_points_granted,
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get_pricing_rule,
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quote_recharge_points,
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)
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from apps.billing.services import (
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InsufficientPointsError,
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InvalidCallStateError,
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RechargeAmountMismatchError,
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RechargePayment,
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apply_recharge_payment,
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mark_call_success,
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precharge_call,
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query_and_apply_recharge_payment,
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refund_call_points,
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)
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from apps.users.models import ApiKey, UserWallet
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TEST_ENCRYPTION_KEY = Fernet.generate_key().decode("ascii")
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class BillingCoreModelTests(TestCase):
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def setUp(self):
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suffix = uuid.uuid4().hex[:8]
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self.user = get_user_model().objects.create_user(
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username=f"client-{suffix}",
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email=f"client-{suffix}@example.com",
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password="password",
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)
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def test_user_wallet_defaults_to_zero_and_rejects_negative_balance(self):
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wallet = UserWallet.objects.create(user=self.user)
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self.assertEqual(wallet.points_balance, 0)
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other_user = get_user_model().objects.create_user(
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username=f"negative-{uuid.uuid4().hex[:8]}",
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email=f"negative-{uuid.uuid4().hex[:8]}@example.com",
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password="password",
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)
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with self.assertRaises(IntegrityError):
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with transaction.atomic():
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UserWallet.objects.create(user=other_user, points_balance=-1)
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def test_api_key_hashes_plaintext_and_matches_only_raw_key(self):
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api_key, raw_key = ApiKey.create_for_user(self.user, name="desktop")
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self.assertTrue(raw_key.startswith("sk_cmhub_"))
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self.assertEqual(api_key.key_prefix, raw_key[: ApiKey.KEY_PREFIX_LENGTH])
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self.assertEqual(len(api_key.key_hash), 64)
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self.assertNotEqual(api_key.key_hash, raw_key)
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self.assertNotIn(raw_key, str(api_key.__dict__))
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self.assertTrue(api_key.matches_key(raw_key))
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self.assertFalse(api_key.matches_key(raw_key + "-wrong"))
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self.assertEqual(api_key.status, ApiKey.Status.ACTIVE)
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def test_call_record_stores_summary_reference_but_no_provider_raw_field(self):
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api_key, _raw_key = ApiKey.create_for_user(self.user)
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call = CallRecord.objects.create(
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user=self.user,
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api_key=api_key,
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operation_type=CallRecord.OperationType.IMAGE,
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alias="image-hd",
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model_used="gpt-image-2",
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resolution="1K",
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prompt="Generate an image",
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points_cost=10,
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status=CallRecord.Status.SUCCESS,
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upstream_latency_ms=1234,
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result_ref="https://cdn.example.test/result.png",
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result_summary="stored image result",
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)
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field_names = {field.name for field in CallRecord._meta.fields}
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self.assertNotIn("raw", field_names)
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self.assertNotIn("provider_raw", field_names)
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self.assertEqual(call.user, self.user)
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self.assertEqual(call.api_key, api_key)
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self.assertEqual(call.alias, "image-hd")
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self.assertEqual(call.model_used, "gpt-image-2")
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self.assertEqual(call.result_ref, "https://cdn.example.test/result.png")
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self.assertEqual(call.result_summary, "stored image result")
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def test_points_ledger_records_balance_and_requires_adjust_reason(self):
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call = CallRecord.objects.create(
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user=self.user,
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operation_type=CallRecord.OperationType.TITLE,
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alias="title-standard",
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model_used="gpt-5.5",
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points_cost=2,
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status=CallRecord.Status.SUCCESS,
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)
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ledger = PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.CONSUME,
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points_delta=-2,
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balance_after=98,
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ref_call=call,
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)
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self.assertEqual(ledger.ref_call, call)
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self.assertEqual(ledger.balance_after, 98)
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adjustment = PointsLedger(
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user=self.user,
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change_type=PointsLedger.ChangeType.ADJUST,
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points_delta=10,
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balance_after=108,
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)
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with self.assertRaises(ValidationError):
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adjustment.full_clean()
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def test_points_ledger_rejects_zero_delta_and_negative_balance_after(self):
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with self.assertRaises(IntegrityError):
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with transaction.atomic():
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.RECHARGE,
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points_delta=0,
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balance_after=100,
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)
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with self.assertRaises(IntegrityError):
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with transaction.atomic():
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.CONSUME,
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points_delta=-1,
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balance_after=-1,
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)
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def test_points_ledger_allows_consume_and_refund_but_rejects_duplicate_refund(self):
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call = CallRecord.objects.create(
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user=self.user,
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operation_type=CallRecord.OperationType.TITLE,
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alias="title-standard",
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model_used="gpt-5.5",
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points_cost=2,
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status=CallRecord.Status.FAILED,
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)
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.CONSUME,
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points_delta=-2,
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balance_after=98,
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ref_call=call,
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)
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.REFUND,
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points_delta=2,
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balance_after=100,
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ref_call=call,
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)
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with self.assertRaises(IntegrityError):
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with transaction.atomic():
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.REFUND,
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points_delta=2,
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balance_after=102,
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ref_call=call,
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)
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def test_points_ledger_rejects_duplicate_recharge_for_same_order(self):
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order = RechargeOrder.objects.create(
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user=self.user,
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order_no=f"R{uuid.uuid4().hex[:12]}",
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amount_money=Decimal("20.00"),
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pay_method=RechargeOrder.PayMethod.WEIXIN,
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exchange_rate=Decimal("10.0000"),
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points_granted=200,
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)
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other_order = RechargeOrder.objects.create(
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user=self.user,
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order_no=f"R{uuid.uuid4().hex[:12]}",
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amount_money=Decimal("30.00"),
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pay_method=RechargeOrder.PayMethod.WEIXIN,
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exchange_rate=Decimal("10.0000"),
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points_granted=300,
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)
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.RECHARGE,
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points_delta=200,
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balance_after=200,
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ref_order_id=order.id,
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)
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.RECHARGE,
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points_delta=300,
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balance_after=500,
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ref_order_id=other_order.id,
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)
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with self.assertRaises(IntegrityError):
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with transaction.atomic():
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PointsLedger.objects.create(
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user=self.user,
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change_type=PointsLedger.ChangeType.RECHARGE,
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points_delta=200,
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balance_after=700,
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ref_order_id=order.id,
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)
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def test_billing_models_are_registered_in_admin(self):
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self.assertIn(UserWallet, admin.site._registry)
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self.assertIn(ApiKey, admin.site._registry)
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self.assertIn(PointsLedger, admin.site._registry)
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self.assertIn(CallRecord, admin.site._registry)
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self.assertIn(RechargeOrder, admin.site._registry)
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@override_settings(AI_KEY_ENCRYPTION_KEY=TEST_ENCRYPTION_KEY)
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class PricingCalculationTests(TestCase):
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def setUp(self):
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suffix = uuid.uuid4().hex[:8]
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self.title_alias = f"title-standard-{suffix}"
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self.image_alias = f"image-hd-{suffix}"
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self.text_model = self.create_ai_model(
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name="Text model A",
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model=f"gpt-5.5-a-{suffix}",
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capabilities=["text"],
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)
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self.replacement_text_model = self.create_ai_model(
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name="Text model B",
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model=f"gpt-5.5-b-{suffix}",
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capabilities=["text"],
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)
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self.alias = ModelAlias.objects.create(
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operation_type=ModelAlias.OperationType.TITLE,
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alias=self.title_alias,
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ai_model=self.text_model,
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)
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def create_ai_model(self, *, name, model, capabilities):
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ai_model = AiModel(
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name=name,
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url="https://api.vectorengine.ai/v1",
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model=model,
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api_type=AiModel.ApiType.CHAT,
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capabilities=capabilities,
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)
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ai_model.set_api_key("sk-test-secret")
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ai_model.save()
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return ai_model
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def test_exact_resolution_rule_overrides_alias_default(self):
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PricingRule.objects.create(
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operation_type=CallRecord.OperationType.IMAGE,
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alias=self.image_alias,
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resolution="",
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points_cost=10,
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)
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PricingRule.objects.create(
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operation_type=CallRecord.OperationType.IMAGE,
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alias=self.image_alias,
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resolution="1k",
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points_cost=15,
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)
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self.assertEqual(
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calculate_points_cost(
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CallRecord.OperationType.IMAGE,
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self.image_alias,
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"1K",
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),
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15,
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)
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self.assertEqual(
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calculate_points_cost(
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CallRecord.OperationType.IMAGE,
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self.image_alias,
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"2K",
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),
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10,
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)
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exact_rule = get_pricing_rule(
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CallRecord.OperationType.IMAGE,
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self.image_alias,
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"1k",
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)
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self.assertEqual(exact_rule.resolution, "1K")
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def test_pricing_is_bound_to_alias_not_underlying_model(self):
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PricingRule.objects.create(
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operation_type=CallRecord.OperationType.TITLE,
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alias=self.title_alias,
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points_cost=2,
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)
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self.assertEqual(
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calculate_points_cost(
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CallRecord.OperationType.TITLE,
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self.title_alias,
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"1K",
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),
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2,
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)
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self.alias.ai_model = self.replacement_text_model
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self.alias.save()
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self.assertEqual(
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calculate_points_cost(
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CallRecord.OperationType.TITLE,
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self.title_alias,
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"1K",
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),
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2,
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)
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def test_missing_pricing_rule_raises_no_pricing_rule_code(self):
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with self.assertRaises(NoPricingRuleError) as context:
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calculate_points_cost(
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CallRecord.OperationType.TITLE,
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"missing-alias",
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"1K",
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)
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self.assertEqual(context.exception.code, "no_pricing_rule")
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def test_exchange_rate_uses_latest_active_effective_rate_and_floors_points(self):
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now = timezone.now()
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ExchangeRate.objects.create(
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currency="cny",
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points_per_unit=Decimal("10.0000"),
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effective_from=now - timedelta(days=2),
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)
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current = ExchangeRate.objects.create(
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currency="CNY",
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points_per_unit=Decimal("12.5000"),
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effective_from=now - timedelta(days=1),
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)
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ExchangeRate.objects.create(
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currency="CNY",
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points_per_unit=Decimal("20.0000"),
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effective_from=now,
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is_active=False,
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)
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ExchangeRate.objects.create(
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currency="CNY",
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points_per_unit=Decimal("99.0000"),
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effective_from=now + timedelta(days=1),
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)
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quote = quote_recharge_points(Decimal("8.88"), currency="cny", at=now)
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self.assertEqual(quote.exchange_rate, current)
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self.assertEqual(quote.currency, "CNY")
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self.assertEqual(quote.points_per_unit, Decimal("12.5000"))
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self.assertEqual(quote.points_granted, 111)
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self.assertEqual(calculate_points_granted("8.88", currency="CNY", at=now), 111)
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class BillingServiceTests(TestCase):
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def setUp(self):
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suffix = uuid.uuid4().hex[:8]
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self.user = get_user_model().objects.create_user(
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username=f"charged-client-{suffix}",
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email=f"charged-client-{suffix}@example.com",
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password="password",
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)
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self.wallet = UserWallet.objects.create(user=self.user, points_balance=100)
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self.api_key, _raw_key = ApiKey.create_for_user(self.user, name="server")
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def create_recharge_order(
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self,
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*,
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amount="20.00",
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points_granted=200,
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pay_method=RechargeOrder.PayMethod.WEIXIN,
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) -> RechargeOrder:
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return RechargeOrder.objects.create(
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user=self.user,
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order_no=f"R{uuid.uuid4().hex[:12]}",
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amount_money=Decimal(amount),
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pay_method=pay_method,
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exchange_rate=Decimal("10.0000"),
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points_granted=points_granted,
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)
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def test_precharge_call_debits_wallet_and_writes_pending_call_and_consume_ledger(self):
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charge = precharge_call(
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user=self.user,
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api_key=self.api_key,
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operation_type=CallRecord.OperationType.TITLE,
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alias="title-standard",
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model_used="gpt-5.5",
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resolution="1k",
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prompt="Generate titles",
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points_cost=12,
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)
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self.wallet.refresh_from_db()
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self.assertEqual(self.wallet.points_balance, 88)
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self.assertEqual(charge.balance_after, 88)
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self.assertEqual(charge.points_cost, 12)
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call = charge.call_record
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self.assertEqual(call.status, CallRecord.Status.PENDING)
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self.assertEqual(call.user, self.user)
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self.assertEqual(call.api_key, self.api_key)
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self.assertEqual(call.alias, "title-standard")
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self.assertEqual(call.resolution, "1K")
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self.assertEqual(call.points_cost, 12)
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ledger = charge.ledger_entry
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self.assertEqual(ledger.change_type, PointsLedger.ChangeType.CONSUME)
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self.assertEqual(ledger.points_delta, -12)
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self.assertEqual(ledger.balance_after, 88)
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self.assertEqual(ledger.ref_call, call)
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def test_precharge_call_rejects_insufficient_points_without_call_or_ledger(self):
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self.wallet.points_balance = 5
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self.wallet.save(update_fields=("points_balance", "updated_at"))
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with self.assertRaises(InsufficientPointsError) as context:
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precharge_call(
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user=self.user,
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operation_type=CallRecord.OperationType.IMAGE,
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alias="image-hd",
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model_used="gpt-image-2",
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points_cost=10,
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)
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self.assertEqual(context.exception.code, "insufficient_points")
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self.assertEqual(context.exception.required_points, 10)
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self.assertEqual(context.exception.available_points, 5)
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self.wallet.refresh_from_db()
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self.assertEqual(self.wallet.points_balance, 5)
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self.assertFalse(CallRecord.objects.filter(user=self.user).exists())
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self.assertFalse(PointsLedger.objects.filter(user=self.user).exists())
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def test_refund_call_points_restores_balance_marks_failed_and_is_idempotent(self):
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charge = precharge_call(
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user=self.user,
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operation_type=CallRecord.OperationType.IMAGE,
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alias="image-hd",
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model_used="gpt-image-2",
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points_cost=30,
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)
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refund = refund_call_points(
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charge.call_record,
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error_message="upstream timeout",
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reason="provider failed",
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)
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self.wallet.refresh_from_db()
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refund.call_record.refresh_from_db()
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self.assertTrue(refund.refunded)
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self.assertEqual(refund.points_refunded, 30)
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self.assertEqual(refund.balance_after, 100)
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self.assertEqual(self.wallet.points_balance, 100)
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self.assertEqual(refund.call_record.status, CallRecord.Status.FAILED)
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self.assertEqual(refund.call_record.error_message, "upstream timeout")
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self.assertEqual(refund.ledger_entry.change_type, PointsLedger.ChangeType.REFUND)
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self.assertEqual(refund.ledger_entry.points_delta, 30)
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self.assertEqual(refund.ledger_entry.balance_after, 100)
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second_refund = refund_call_points(charge.call_record, error_message="retry timeout")
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self.wallet.refresh_from_db()
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self.assertFalse(second_refund.refunded)
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self.assertEqual(second_refund.points_refunded, 0)
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self.assertEqual(self.wallet.points_balance, 100)
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self.assertEqual(
|
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PointsLedger.objects.filter(
|
|
ref_call=charge.call_record,
|
|
change_type=PointsLedger.ChangeType.REFUND,
|
|
).count(),
|
|
1,
|
|
)
|
|
|
|
def test_mark_call_success_does_not_change_balance_and_blocks_failure_refund(self):
|
|
charge = precharge_call(
|
|
user=self.user,
|
|
operation_type=CallRecord.OperationType.TITLE,
|
|
alias="title-standard",
|
|
model_used="gpt-5.5",
|
|
points_cost=8,
|
|
)
|
|
|
|
call = mark_call_success(
|
|
charge.call_record,
|
|
result_ref="https://cdn.example.test/result.txt",
|
|
result_summary="3 titles",
|
|
upstream_latency_ms=42,
|
|
)
|
|
|
|
self.wallet.refresh_from_db()
|
|
self.assertEqual(self.wallet.points_balance, 92)
|
|
self.assertEqual(call.status, CallRecord.Status.SUCCESS)
|
|
self.assertEqual(call.result_ref, "https://cdn.example.test/result.txt")
|
|
self.assertEqual(call.result_summary, "3 titles")
|
|
self.assertEqual(call.upstream_latency_ms, 42)
|
|
|
|
with self.assertRaises(InvalidCallStateError):
|
|
refund_call_points(call, error_message="late failure")
|
|
|
|
def test_apply_recharge_payment_credits_wallet_writes_ledger_and_marks_paid(self):
|
|
order = self.create_recharge_order(amount="20.00", points_granted=200)
|
|
|
|
result = apply_recharge_payment(
|
|
RechargePayment(
|
|
order_no=order.order_no,
|
|
pay_method=RechargeOrder.PayMethod.WEIXIN,
|
|
amount=Decimal("20.00"),
|
|
transaction_id="wx-txn-001",
|
|
paid_at=timezone.now(),
|
|
)
|
|
)
|
|
|
|
self.wallet.refresh_from_db()
|
|
order.refresh_from_db()
|
|
self.assertTrue(result.applied)
|
|
self.assertEqual(result.points_granted, 200)
|
|
self.assertEqual(result.balance_after, 300)
|
|
self.assertEqual(self.wallet.points_balance, 300)
|
|
self.assertEqual(order.status, RechargeOrder.Status.PAID)
|
|
self.assertEqual(order.payment_txn_no, "wx-txn-001")
|
|
self.assertIsNotNone(order.paid_at)
|
|
|
|
ledger = PointsLedger.objects.get(ref_order_id=order.id)
|
|
self.assertEqual(ledger.change_type, PointsLedger.ChangeType.RECHARGE)
|
|
self.assertEqual(ledger.points_delta, 200)
|
|
self.assertEqual(ledger.balance_after, 300)
|
|
self.assertEqual(ledger.user, self.user)
|
|
|
|
def test_apply_recharge_payment_is_idempotent_for_duplicate_callback(self):
|
|
order = self.create_recharge_order(amount="20.00", points_granted=200)
|
|
payment = RechargePayment(
|
|
order_no=order.order_no,
|
|
pay_method=RechargeOrder.PayMethod.WEIXIN,
|
|
amount=Decimal("20.00"),
|
|
transaction_id="wx-txn-duplicate",
|
|
paid_at=timezone.now(),
|
|
)
|
|
|
|
first = apply_recharge_payment(payment)
|
|
second = apply_recharge_payment(payment)
|
|
|
|
self.wallet.refresh_from_db()
|
|
self.assertTrue(first.applied)
|
|
self.assertFalse(second.applied)
|
|
self.assertEqual(self.wallet.points_balance, 300)
|
|
self.assertEqual(
|
|
PointsLedger.objects.filter(
|
|
ref_order_id=order.id,
|
|
change_type=PointsLedger.ChangeType.RECHARGE,
|
|
).count(),
|
|
1,
|
|
)
|
|
|
|
def test_apply_recharge_payment_rejects_amount_mismatch_without_crediting(self):
|
|
order = self.create_recharge_order(amount="20.00", points_granted=200)
|
|
|
|
with self.assertRaises(RechargeAmountMismatchError):
|
|
apply_recharge_payment(
|
|
RechargePayment(
|
|
order_no=order.order_no,
|
|
pay_method=RechargeOrder.PayMethod.WEIXIN,
|
|
amount=Decimal("19.99"),
|
|
transaction_id="wx-txn-bad-amount",
|
|
paid_at=timezone.now(),
|
|
)
|
|
)
|
|
|
|
self.wallet.refresh_from_db()
|
|
order.refresh_from_db()
|
|
self.assertEqual(self.wallet.points_balance, 100)
|
|
self.assertEqual(order.status, RechargeOrder.Status.PENDING)
|
|
self.assertFalse(PointsLedger.objects.filter(ref_order_id=order.id).exists())
|
|
|
|
def test_query_and_apply_recharge_payment_uses_same_idempotent_path(self):
|
|
order = self.create_recharge_order(amount="30.00", points_granted=300)
|
|
|
|
def fake_query(queried_order):
|
|
return RechargePayment(
|
|
order_no=queried_order.order_no,
|
|
pay_method=queried_order.pay_method,
|
|
amount=queried_order.amount_money,
|
|
transaction_id="queried-txn-001",
|
|
paid_at=timezone.now(),
|
|
)
|
|
|
|
result = query_and_apply_recharge_payment(order.order_no, fake_query)
|
|
|
|
self.wallet.refresh_from_db()
|
|
order.refresh_from_db()
|
|
self.assertTrue(result.applied)
|
|
self.assertEqual(self.wallet.points_balance, 400)
|
|
self.assertEqual(order.status, RechargeOrder.Status.PAID)
|
|
self.assertEqual(order.payment_txn_no, "queried-txn-001")
|
|
|
|
|
|
class ConcurrentDebitTests(TransactionTestCase):
|
|
def setUp(self):
|
|
self.addCleanup(connections.close_all)
|
|
suffix = uuid.uuid4().hex[:8]
|
|
self.user = get_user_model().objects.create_user(
|
|
username=f"concurrent-client-{suffix}",
|
|
email=f"concurrent-client-{suffix}@example.com",
|
|
password="password",
|
|
)
|
|
UserWallet.objects.create(user=self.user, points_balance=30)
|
|
|
|
def test_concurrent_precharge_does_not_overspend_or_make_balance_negative(self):
|
|
worker_count = 2
|
|
barrier = threading.Barrier(worker_count)
|
|
results = []
|
|
errors = []
|
|
results_lock = threading.Lock()
|
|
|
|
def worker(index):
|
|
connections.close_all()
|
|
try:
|
|
for attempt in range(3):
|
|
try:
|
|
connections["default"].ensure_connection()
|
|
break
|
|
except OperationalError as exc:
|
|
connections.close_all()
|
|
if attempt == 2:
|
|
with results_lock:
|
|
errors.append(repr(exc))
|
|
barrier.abort()
|
|
return
|
|
time.sleep(0.5)
|
|
barrier.wait(timeout=15)
|
|
charge = precharge_call(
|
|
user=self.user,
|
|
operation_type=CallRecord.OperationType.TITLE,
|
|
alias="title-standard",
|
|
model_used="gpt-5.5",
|
|
points_cost=30,
|
|
prompt=f"worker {index}",
|
|
)
|
|
with results_lock:
|
|
results.append(("success", charge.balance_after))
|
|
except InsufficientPointsError as exc:
|
|
with results_lock:
|
|
results.append((exc.code, exc.available_points))
|
|
except Exception as exc: # pragma: no cover - surfaced through assertion below.
|
|
with results_lock:
|
|
errors.append(repr(exc))
|
|
finally:
|
|
connections.close_all()
|
|
|
|
threads = [threading.Thread(target=worker, args=(index,)) for index in range(worker_count)]
|
|
for thread in threads:
|
|
thread.start()
|
|
for thread in threads:
|
|
thread.join(timeout=30)
|
|
|
|
self.assertFalse(any(thread.is_alive() for thread in threads), "worker thread timed out")
|
|
self.assertEqual(errors, [])
|
|
|
|
success_count = sum(1 for status, _value in results if status == "success")
|
|
insufficient_count = sum(1 for status, _value in results if status == "insufficient_points")
|
|
self.assertEqual(success_count, 1)
|
|
self.assertEqual(insufficient_count, 1)
|
|
|
|
wallet = UserWallet.objects.get(user=self.user)
|
|
self.assertEqual(wallet.points_balance, 0)
|
|
self.assertEqual(
|
|
PointsLedger.objects.filter(
|
|
user=self.user,
|
|
change_type=PointsLedger.ChangeType.CONSUME,
|
|
).count(),
|
|
1,
|
|
)
|
|
self.assertEqual(CallRecord.objects.filter(user=self.user).count(), 1)
|
|
self.assertFalse(
|
|
PointsLedger.objects.filter(
|
|
user=self.user,
|
|
balance_after__lt=0,
|
|
).exists()
|
|
)
|