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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.
import os
import shutil
import signal
import tempfile
from io import BytesIO
from s3transfer.compat import BaseManager, readable, seekable
from tests import skip_if_windows, unittest
class ErrorRaisingSeekWrapper:
"""An object wrapper that throws an error when seeked on
:param fileobj: The fileobj that it wraps
:param exception: The exception to raise when seeked on.
"""
def __init__(self, fileobj, exception):
self._fileobj = fileobj
self._exception = exception
def seek(self, offset, whence=0):
raise self._exception
def tell(self):
return self._fileobj.tell()
class TestSeekable(unittest.TestCase):
def setUp(self):
self.tempdir = tempfile.mkdtemp()
self.filename = os.path.join(self.tempdir, 'foo')
def tearDown(self):
shutil.rmtree(self.tempdir)
def test_seekable_fileobj(self):
with open(self.filename, 'w') as f:
self.assertTrue(seekable(f))
def test_non_file_like_obj(self):
# Fails because there is no seekable(), seek(), nor tell()
self.assertFalse(seekable(object()))
def test_non_seekable_ioerror(self):
# Should return False if IOError is thrown.
with open(self.filename, 'w') as f:
self.assertFalse(seekable(ErrorRaisingSeekWrapper(f, IOError())))
def test_non_seekable_oserror(self):
# Should return False if OSError is thrown.
with open(self.filename, 'w') as f:
self.assertFalse(seekable(ErrorRaisingSeekWrapper(f, OSError())))
class TestReadable(unittest.TestCase):
def test_readable_fileobj(self):
with tempfile.TemporaryFile() as f:
self.assertTrue(readable(f))
def test_readable_file_like_obj(self):
self.assertTrue(readable(BytesIO()))
def test_non_file_like_obj(self):
self.assertFalse(readable(object()))
class TestBaseManager(unittest.TestCase):
def create_pid_manager(self):
class PIDManager(BaseManager):
pass
PIDManager.register('getpid', os.getpid)
return PIDManager()
def get_pid(self, pid_manager):
pid = pid_manager.getpid()
# A proxy object is returned back. The needed value can be acquired
# from the repr and converting that to an integer
return int(str(pid))
@skip_if_windows('os.kill() with SIGINT not supported on Windows')
def test_can_provide_signal_handler_initializers_to_start(self):
manager = self.create_pid_manager()
manager.start(signal.signal, (signal.SIGINT, signal.SIG_IGN))
pid = self.get_pid(manager)
try:
os.kill(pid, signal.SIGINT)
except KeyboardInterrupt:
pass
# Try using the manager after the os.kill on the parent process. The
# manager should not have died and should still be usable.
self.assertEqual(pid, self.get_pid(manager))
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