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# Copyright (c) 2017 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import sys
from unittest import mock
import fixtures
import testtools
from ovsdbapp import api
from ovsdbapp.tests import base
try:
import eventlet
from eventlet.green import thread
sleep = eventlet.sleep
def create_thread(executable):
eventlet.spawn_n(executable)
except ImportError:
import threading
import time
sleep = time.sleep
def create_thread(executable):
thread = threading.Thread(target=executable)
thread.start()
class GreenThreadingFixture(fixtures.Fixture):
def _setUp(self):
if 'eventlet' in sys.modules:
self._orig = api.threading.get_ident
api.threading.get_ident = thread.get_ident
self.addCleanup(self.cleanup)
def cleanup(self):
api.threading.get_ident = self._orig
class FakeTransaction(object):
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, tb):
self.commit()
def commit(self):
"""Serves just for mock."""
class TestingAPI(api.API):
def create_transaction(self, check_error=False, log_errors=True, **kwargs):
txn = FakeTransaction()
mock.patch.object(txn, 'commit').start()
return txn
TestingAPI.__abstractmethods__ = set()
class TransactionTestCase(base.TestCase):
def setUp(self):
super(TransactionTestCase, self).setUp()
self.api = TestingAPI()
self.useFixture(GreenThreadingFixture())
def test_transaction_nested(self):
with self.api.transaction() as txn1:
with self.api.transaction() as txn2:
self.assertIs(txn1, txn2)
txn1.commit.assert_called_once_with()
def test_transaction_nested_false(self):
with self.api.transaction(nested=False) as txn1:
with self.api.transaction() as txn2:
self.assertIsNot(txn1, txn2)
txn1.commit.assert_called_once_with()
txn2.commit.assert_called_once_with()
def test_api_level_transaction_nested_fales(self):
api = TestingAPI(nested_transactions=False)
with api.transaction() as txn1:
with api.transaction() as txn2:
self.assertIsNot(txn1, txn2)
txn1.commit.assert_called_once_with()
txn2.commit.assert_called_once_with()
def test_transaction_no_nested_transaction_after_error(self):
class TestException(Exception):
pass
with testtools.ExpectedException(TestException):
with self.api.transaction() as txn1:
raise TestException()
with self.api.transaction() as txn2:
self.assertIsNot(txn1, txn2)
def test_transaction_nested_multiple_threads(self):
shared_resource = []
def thread1():
with self.api.transaction() as txn:
shared_resource.append(txn)
while len(shared_resource) == 1:
sleep(0.1)
shared_resource.append(0)
def thread2():
while len(shared_resource) != 1:
sleep(0.1)
with self.api.transaction() as txn:
shared_resource.append(txn)
shared_resource.append(0)
create_thread(thread1)
create_thread(thread2)
while len(shared_resource) != 4:
sleep(0.1)
txn1, txn2 = shared_resource[:2]
self.assertNotEqual(txn1, txn2)
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