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import unittest
from django.db import connection, connections, transaction
from django.http import Http404
from django.test import TestCase, TransactionTestCase, override_settings
from django.urls import path
from rest_framework import status
from rest_framework.exceptions import APIException
from rest_framework.response import Response
from rest_framework.test import APIRequestFactory
from rest_framework.views import APIView
from tests.models import BasicModel
factory = APIRequestFactory()
class BasicView(APIView):
def post(self, request, *args, **kwargs):
BasicModel.objects.create()
return Response({'method': 'GET'})
class ErrorView(APIView):
def post(self, request, *args, **kwargs):
BasicModel.objects.create()
raise Exception
class APIExceptionView(APIView):
def post(self, request, *args, **kwargs):
BasicModel.objects.create()
raise APIException
class NonAtomicAPIExceptionView(APIView):
@transaction.non_atomic_requests
def dispatch(self, *args, **kwargs):
return super().dispatch(*args, **kwargs)
def get(self, request, *args, **kwargs):
BasicModel.objects.all()
raise Http404
urlpatterns = (
path('', NonAtomicAPIExceptionView.as_view()),
)
@unittest.skipUnless(
connection.features.uses_savepoints,
"'atomic' requires transactions and savepoints."
)
class DBTransactionTests(TestCase):
def setUp(self):
self.view = BasicView.as_view()
connections.databases['default']['ATOMIC_REQUESTS'] = True
def tearDown(self):
connections.databases['default']['ATOMIC_REQUESTS'] = False
def test_no_exception_commit_transaction(self):
request = factory.post('/')
with self.assertNumQueries(1):
response = self.view(request)
assert not transaction.get_rollback()
assert response.status_code == status.HTTP_200_OK
assert BasicModel.objects.count() == 1
@unittest.skipUnless(
connection.features.uses_savepoints,
"'atomic' requires transactions and savepoints."
)
class DBTransactionErrorTests(TestCase):
def setUp(self):
self.view = ErrorView.as_view()
connections.databases['default']['ATOMIC_REQUESTS'] = True
def tearDown(self):
connections.databases['default']['ATOMIC_REQUESTS'] = False
def test_generic_exception_delegate_transaction_management(self):
"""
Transaction is eventually managed by outer-most transaction atomic
block. DRF do not try to interfere here.
We let django deal with the transaction when it will catch the Exception.
"""
request = factory.post('/')
with self.assertNumQueries(3):
# 1 - begin savepoint
# 2 - insert
# 3 - release savepoint
with transaction.atomic():
self.assertRaises(Exception, self.view, request)
assert not transaction.get_rollback()
assert BasicModel.objects.count() == 1
@unittest.skipUnless(
connection.features.uses_savepoints,
"'atomic' requires transactions and savepoints."
)
class DBTransactionAPIExceptionTests(TestCase):
def setUp(self):
self.view = APIExceptionView.as_view()
connections.databases['default']['ATOMIC_REQUESTS'] = True
def tearDown(self):
connections.databases['default']['ATOMIC_REQUESTS'] = False
def test_api_exception_rollback_transaction(self):
"""
Transaction is rollbacked by our transaction atomic block.
"""
request = factory.post('/')
num_queries = 4 if connection.features.can_release_savepoints else 3
with self.assertNumQueries(num_queries):
# 1 - begin savepoint
# 2 - insert
# 3 - rollback savepoint
# 4 - release savepoint
with transaction.atomic():
response = self.view(request)
assert transaction.get_rollback()
assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
assert BasicModel.objects.count() == 0
@unittest.skipUnless(
connection.features.uses_savepoints,
"'atomic' requires transactions and savepoints."
)
class MultiDBTransactionAPIExceptionTests(TestCase):
databases = '__all__'
def setUp(self):
self.view = APIExceptionView.as_view()
connections.databases['default']['ATOMIC_REQUESTS'] = True
connections.databases['secondary']['ATOMIC_REQUESTS'] = True
def tearDown(self):
connections.databases['default']['ATOMIC_REQUESTS'] = False
connections.databases['secondary']['ATOMIC_REQUESTS'] = False
def test_api_exception_rollback_transaction(self):
"""
Transaction is rollbacked by our transaction atomic block.
"""
request = factory.post('/')
num_queries = 4 if connection.features.can_release_savepoints else 3
with self.assertNumQueries(num_queries):
# 1 - begin savepoint
# 2 - insert
# 3 - rollback savepoint
# 4 - release savepoint
with transaction.atomic(), transaction.atomic(using='secondary'):
response = self.view(request)
assert transaction.get_rollback()
assert transaction.get_rollback(using='secondary')
assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
assert BasicModel.objects.count() == 0
@unittest.skipUnless(
connection.features.uses_savepoints,
"'atomic' requires transactions and savepoints."
)
@override_settings(ROOT_URLCONF='tests.test_atomic_requests')
class NonAtomicDBTransactionAPIExceptionTests(TransactionTestCase):
def setUp(self):
connections.databases['default']['ATOMIC_REQUESTS'] = True
def tearDown(self):
connections.databases['default']['ATOMIC_REQUESTS'] = False
def test_api_exception_rollback_transaction_non_atomic_view(self):
response = self.client.get('/')
# without checking connection.in_atomic_block view raises 500
# due attempt to rollback without transaction
assert response.status_code == status.HTTP_404_NOT_FOUND
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