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# Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import mock
import unittest
import common
from autotest_lib.database import database_connection
from autotest_lib.frontend import setup_django_environment
from autotest_lib.frontend.afe.readonly_connection import ReadOnlyConnection
from autotest_lib.scheduler import scheduler_lib
from django.db import utils as django_utils
class ConnectionManagerTests(unittest.TestCase):
"""Connection manager unittests."""
def setUp(self):
self.connection_manager = None
ReadOnlyConnection.set_globally_disabled = mock.MagicMock()
setup_django_environment.enable_autocommit = mock.MagicMock()
scheduler_lib.Singleton._instances = {}
def tearDown(self):
ReadOnlyConnection.set_globally_disabled.reset_mock()
setup_django_environment.enable_autocommit.reset_mock()
def testConnectionDisconnect(self):
"""Test connection and disconnecting from the database."""
# Test that the connection manager only opens a connection once.
connection_manager = scheduler_lib.ConnectionManager()
connection_manager.open_connection = mock.MagicMock()
connection = connection_manager.get_connection()
connection_manager.open_connection.assert_called_once_with()
connection_manager.open_connection.reset_mock()
connection = connection_manager.get_connection()
self.assertTrue(
connection_manager.open_connection.call_count == 0)
connection_manager.open_connection.reset_mock()
# Test that del on the connection manager closes the connection
connection_manager.disconnect = mock.MagicMock()
connection_manager.__del__()
connection_manager.disconnect.assert_called_once_with()
def testConnectionReconnect(self):
"""Test that retries don't destroy the connection."""
database_connection._DjangoBackend.execute = mock.MagicMock()
database_connection._DjangoBackend.execute.side_effect = (
django_utils.DatabaseError('Database Error'))
connection_manager = scheduler_lib.ConnectionManager()
connection = connection_manager.get_connection()
self.assertRaises(django_utils.DatabaseError,
connection.execute, *('', None, True))
self.assertTrue(
database_connection._DjangoBackend.execute.call_count == 2)
database_connection._DjangoBackend.execute.reset_mock()
self.assertTrue(connection_manager.db_connection ==
connection_manager.get_connection())
def testConnectionManagerSingleton(self):
"""Test that the singleton works as expected."""
# Confirm that instantiating the class applies global db settings.
connection_manager = scheduler_lib.ConnectionManager()
ReadOnlyConnection.set_globally_disabled.assert_called_once_with(False)
setup_django_environment.enable_autocommit.assert_called_once_with()
ReadOnlyConnection.set_globally_disabled.reset_mock()
setup_django_environment.enable_autocommit.reset_mock()
# Confirm that instantiating another connection manager doesn't change
# the database settings, and in fact, returns the original manager.
connection_manager_2 = scheduler_lib.ConnectionManager()
self.assertTrue(connection_manager == connection_manager_2)
self.assertTrue(
ReadOnlyConnection.set_globally_disabled.call_count == 0)
self.assertTrue(
setup_django_environment.enable_autocommit.call_count == 0)
# Confirm that we don't open the connection when the class is
# instantiated.
self.assertTrue(connection_manager.db_connection is None)