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# Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the 'License'). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the 'license' file accompanying this file. This file 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 __tests__ import unittest
from s3transfer.exceptions import InvalidSubscriberMethodError
from s3transfer.subscribers import BaseSubscriber
class ExtraMethodsSubscriber(BaseSubscriber):
def extra_method(self):
return 'called extra method'
class NotCallableSubscriber(BaseSubscriber):
on_done = 'foo'
class NoKwargsSubscriber(BaseSubscriber):
def on_done(self):
pass
class OverrideMethodSubscriber(BaseSubscriber):
def on_queued(self, **kwargs):
return kwargs
class OverrideConstructorSubscriber(BaseSubscriber):
def __init__(self, arg1, arg2):
self.arg1 = arg1
self.arg2 = arg2
class TestSubscribers(unittest.TestCase):
def test_can_instantiate_base_subscriber(self):
try:
BaseSubscriber()
except InvalidSubscriberMethodError:
self.fail('BaseSubscriber should be instantiable')
def test_can_call_base_subscriber_method(self):
subscriber = BaseSubscriber()
try:
subscriber.on_done(future=None)
except Exception as e:
self.fail(
'Should be able to call base class subscriber method. '
'instead got: %s' % e)
def test_subclass_can_have_and_call_additional_methods(self):
subscriber = ExtraMethodsSubscriber()
self.assertEqual(subscriber.extra_method(), 'called extra method')
def test_can_subclass_and_override_method_from_base_subscriber(self):
subscriber = OverrideMethodSubscriber()
# Make sure that the overriden method is called
self.assertEqual(subscriber.on_queued(foo='bar'), {'foo': 'bar'})
def test_can_subclass_and_override_constructor_from_base_class(self):
subscriber = OverrideConstructorSubscriber('foo', arg2='bar')
# Make sure you can create a custom constructor.
self.assertEqual(subscriber.arg1, 'foo')
self.assertEqual(subscriber.arg2, 'bar')
def test_invalid_arguments_in_constructor_of_subclass_subscriber(self):
# The override constructor should still have validation of
# constructor args.
with self.assertRaises(TypeError):
OverrideConstructorSubscriber()
def test_not_callable_in_subclass_subscriber_method(self):
with self.assertRaisesRegexp(
InvalidSubscriberMethodError, 'must be callable'):
NotCallableSubscriber()
def test_no_kwargs_in_subclass_subscriber_method(self):
with self.assertRaisesRegexp(
InvalidSubscriberMethodError, 'must accept keyword'):
NoKwargsSubscriber()
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