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# Copyright 2013 IBM Corp.
#
# 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.
from keystone.common import sql
from keystone.tests import core as test
class CallbackMonitor:
def __init__(self, expect_called=True, raise_=False):
self.expect_called = expect_called
self.called = False
self._complete = False
self._raise = raise_
def call_this(self):
if self._complete:
return
if not self.expect_called:
raise Exception("Did not expect callback.")
if self.called:
raise Exception("Callback already called.")
self.called = True
if self._raise:
raise Exception("When called, raises.")
def check(self):
if self.expect_called:
if not self.called:
raise Exception("Expected function to be called.")
self._complete = True
class TestGlobalEngine(test.TestCase):
def tearDown(self):
sql.set_global_engine(None)
super(TestGlobalEngine, self).tearDown()
def test_notify_on_set(self):
# If call sql.set_global_engine(), notify callbacks get called.
cb_mon = CallbackMonitor()
sql.register_global_engine_callback(cb_mon.call_this)
fake_engine = object()
sql.set_global_engine(fake_engine)
cb_mon.check()
def test_multi_notify(self):
# You can also set multiple notify callbacks and they each get called.
cb_mon1 = CallbackMonitor()
cb_mon2 = CallbackMonitor()
sql.register_global_engine_callback(cb_mon1.call_this)
sql.register_global_engine_callback(cb_mon2.call_this)
fake_engine = object()
sql.set_global_engine(fake_engine)
cb_mon1.check()
cb_mon2.check()
def test_notify_once(self):
# After a callback is called, it's not called again if set global
# engine again.
cb_mon = CallbackMonitor()
sql.register_global_engine_callback(cb_mon.call_this)
fake_engine = object()
sql.set_global_engine(fake_engine)
fake_engine = object()
# Note that cb_mon.call_this would raise if it's called again.
sql.set_global_engine(fake_engine)
cb_mon.check()
def test_set_same_engine(self):
# If you set the global engine to the same engine, callbacks don't get
# called.
fake_engine = object()
sql.set_global_engine(fake_engine)
cb_mon = CallbackMonitor(expect_called=False)
sql.register_global_engine_callback(cb_mon.call_this)
# Note that cb_mon.call_this would raise if it's called.
sql.set_global_engine(fake_engine)
cb_mon.check()
def test_notify_register_same(self):
# If you register the same callback twice, only gets called once.
cb_mon = CallbackMonitor()
sql.register_global_engine_callback(cb_mon.call_this)
sql.register_global_engine_callback(cb_mon.call_this)
fake_engine = object()
# Note that cb_mon.call_this would raise if it's called twice.
sql.set_global_engine(fake_engine)
cb_mon.check()
def test_callback_throws(self):
# If a callback function raises,
# a) the caller doesn't know about it,
# b) other callbacks are still called
cb_mon1 = CallbackMonitor(raise_=True)
cb_mon2 = CallbackMonitor()
sql.register_global_engine_callback(cb_mon1.call_this)
sql.register_global_engine_callback(cb_mon2.call_this)
fake_engine = object()
sql.set_global_engine(fake_engine)
cb_mon1.check()
cb_mon2.check()
class TestBase(test.TestCase):
def tearDown(self):
sql.set_global_engine(None)
super(TestBase, self).tearDown()
def test_get_engine_global(self):
# If call get_engine() twice, get the same global engine.
base = sql.Base()
engine1 = base.get_engine()
self.assertIsNotNone(engine1)
engine2 = base.get_engine()
self.assertIs(engine1, engine2)
def test_get_engine_not_global(self):
# If call get_engine() twice, once with allow_global_engine=True
# and once with allow_global_engine=False, get different engines.
base = sql.Base()
engine1 = base.get_engine()
engine2 = base.get_engine(allow_global_engine=False)
self.assertIsNot(engine1, engine2)
def test_get_session(self):
# autocommit and expire_on_commit flags to get_session() are passed on
# to the session created.
base = sql.Base()
session = base.get_session(autocommit=False, expire_on_commit=True)
self.assertFalse(session.autocommit)
self.assertTrue(session.expire_on_commit)
def test_get_session_invalidated(self):
# If clear the global engine, a new engine is used for get_session().
base = sql.Base()
session1 = base.get_session()
sql.set_global_engine(None)
session2 = base.get_session()
self.assertIsNot(session1.bind, session2.bind)
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