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# Copyright 2019 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.
import glob
import os
from multiprocessing.managers import BaseManager
import mock
import botocore.exceptions
import botocore.session
from botocore.stub import Stubber
from __tests__ import unittest
from __tests__ import FileCreator
from s3transfer.compat import six
from s3transfer.exceptions import CancelledError
from s3transfer.processpool import ProcessTransferConfig
from s3transfer.processpool import ProcessPoolDownloader
from s3transfer.processpool import ClientFactory
class StubbedClient(object):
def __init__(self):
self._client = botocore.session.get_session().create_client(
's3', 'us-west-2', aws_access_key_id='foo',
aws_secret_access_key='bar')
self._stubber = Stubber(self._client)
self._stubber.activate()
self._caught_stubber_errors = []
def get_object(self, **kwargs):
return self._client.get_object(**kwargs)
def head_object(self, **kwargs):
return self._client.head_object(**kwargs)
def add_response(self, *args, **kwargs):
self._stubber.add_response(*args, **kwargs)
def add_client_error(self, *args, **kwargs):
self._stubber.add_client_error(*args, **kwargs)
class StubbedClientManager(BaseManager):
pass
StubbedClientManager.register('StubbedClient', StubbedClient)
# Ideally a Mock would be used here. However, they cannot be pickled
# for Windows. So instead we define a factory class at the module level that
# can return a stubbed client we initialized in the setUp.
class StubbedClientFactory(object):
def __init__(self, stubbed_client):
self._stubbed_client = stubbed_client
def __call__(self, *args, **kwargs):
# The __call__ is defined so we can provide an instance of the
# StubbedClientFactory to mock.patch() and have the instance be
# returned when the patched class is instantiated.
return self
def create_client(self):
return self._stubbed_client
class TestProcessPoolDownloader(unittest.TestCase):
def setUp(self):
# The stubbed client needs to run in a manager to be shared across
# processes and have it properly consume the stubbed response across
# processes.
self.manager = StubbedClientManager()
self.manager.start()
self.stubbed_client = self.manager.StubbedClient()
self.stubbed_client_factory = StubbedClientFactory(self.stubbed_client)
self.client_factory_patch = mock.patch(
's3transfer.processpool.ClientFactory',
self.stubbed_client_factory
)
self.client_factory_patch.start()
self.files = FileCreator()
self.config = ProcessTransferConfig(
max_request_processes=1
)
self.downloader = ProcessPoolDownloader(config=self.config)
self.bucket = 'mybucket'
self.key = 'mykey'
self.filename = self.files.full_path('filename')
self.remote_contents = b'my content'
self.stream = six.BytesIO(self.remote_contents)
def tearDown(self):
self.manager.shutdown()
self.client_factory_patch.stop()
self.files.remove_all()
def assert_contents(self, filename, expected_contents):
self.assertTrue(os.path.exists(filename))
with open(filename, 'rb') as f:
self.assertEqual(f.read(), expected_contents)
def test_download_file(self):
self.stubbed_client.add_response(
'head_object', {'ContentLength': len(self.remote_contents)})
self.stubbed_client.add_response(
'get_object', {'Body': self.stream}
)
with self.downloader:
self.downloader.download_file(self.bucket, self.key, self.filename)
self.assert_contents(self.filename, self.remote_contents)
def test_download_multiple_files(self):
self.stubbed_client.add_response(
'get_object', {'Body': self.stream}
)
self.stubbed_client.add_response(
'get_object', {'Body': six.BytesIO(self.remote_contents)}
)
with self.downloader:
self.downloader.download_file(
self.bucket, self.key, self.filename,
expected_size=len(self.remote_contents))
other_file = self.files.full_path('filename2')
self.downloader.download_file(
self.bucket, self.key, other_file,
expected_size=len(self.remote_contents))
self.assert_contents(self.filename, self.remote_contents)
self.assert_contents(other_file, self.remote_contents)
def test_download_file_ranged_download(self):
half_of_content_length = int(len(self.remote_contents)/2)
self.stubbed_client.add_response(
'head_object', {'ContentLength': len(self.remote_contents)})
self.stubbed_client.add_response(
'get_object', {
'Body': six.BytesIO(
self.remote_contents[:half_of_content_length])}
)
self.stubbed_client.add_response(
'get_object', {
'Body': six.BytesIO(
self.remote_contents[half_of_content_length:])}
)
downloader = ProcessPoolDownloader(
config=ProcessTransferConfig(
multipart_chunksize=half_of_content_length,
multipart_threshold=half_of_content_length,
max_request_processes=1
)
)
with downloader:
downloader.download_file(self.bucket, self.key, self.filename)
self.assert_contents(self.filename, self.remote_contents)
def test_download_file_extra_args(self):
self.stubbed_client.add_response(
'head_object', {'ContentLength': len(self.remote_contents)},
expected_params={
'Bucket': self.bucket, 'Key': self.key,
'VersionId': 'versionid'
}
)
self.stubbed_client.add_response(
'get_object', {'Body': self.stream},
expected_params={
'Bucket': self.bucket, 'Key': self.key,
'VersionId': 'versionid'
}
)
with self.downloader:
self.downloader.download_file(
self.bucket, self.key, self.filename,
extra_args={'VersionId': 'versionid'}
)
self.assert_contents(self.filename, self.remote_contents)
def test_download_file_expected_size(self):
self.stubbed_client.add_response(
'get_object', {'Body': self.stream}
)
with self.downloader:
self.downloader.download_file(
self.bucket, self.key, self.filename,
expected_size=len(self.remote_contents))
self.assert_contents(self.filename, self.remote_contents)
def test_cleans_up_tempfile_on_failure(self):
self.stubbed_client.add_client_error('get_object', 'NoSuchKey')
with self.downloader:
self.downloader.download_file(
self.bucket, self.key, self.filename,
expected_size=len(self.remote_contents))
self.assertFalse(os.path.exists(self.filename))
# Any tempfile should have been erased as well
possible_matches = glob.glob('%s*' % self.filename + os.extsep)
self.assertEqual(possible_matches, [])
def test_validates_extra_args(self):
with self.downloader:
with self.assertRaises(ValueError):
self.downloader.download_file(
self.bucket, self.key, self.filename,
extra_args={'NotSupported': 'NotSupported'}
)
def test_result_with_success(self):
self.stubbed_client.add_response(
'get_object', {'Body': self.stream}
)
with self.downloader:
future = self.downloader.download_file(
self.bucket, self.key, self.filename,
expected_size=len(self.remote_contents))
self.assertIsNone(future.result())
def test_result_with_exception(self):
self.stubbed_client.add_client_error('get_object', 'NoSuchKey')
with self.downloader:
future = self.downloader.download_file(
self.bucket, self.key, self.filename,
expected_size=len(self.remote_contents))
with self.assertRaises(botocore.exceptions.ClientError):
future.result()
def test_result_with_cancel(self):
self.stubbed_client.add_response(
'get_object', {'Body': self.stream}
)
with self.downloader:
future = self.downloader.download_file(
self.bucket, self.key, self.filename,
expected_size=len(self.remote_contents))
future.cancel()
with self.assertRaises(CancelledError):
future.result()
def test_shutdown_with_no_downloads(self):
downloader = ProcessPoolDownloader()
try:
downloader.shutdown()
except AttributeError:
self.fail(
'The downloader should be able to be shutdown even though '
'the downloader was never started.'
)
def test_shutdown_with_no_downloads_and_ctrl_c(self):
# Special shutdown logic happens if a KeyboardInterrupt is raised in
# the context manager. However, this logic can not happen if the
# downloader was never started. So a KeyboardInterrupt should be
# the only exception propagated.
with self.assertRaises(KeyboardInterrupt):
with self.downloader:
raise KeyboardInterrupt()
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