def testInvalidSeek(self):
"""Tests that seeking fails for unsupported seek arguments."""
daisy_chain_wrapper = DaisyChainWrapper(
self._dummy_url, self.test_data_file_len, self.MockDownloadCloudApi([]))
try:
# SEEK_CUR is invalid.
daisy_chain_wrapper.seek(0, whence=os.SEEK_CUR)
self.fail('Expected exception')
except IOError, e:
self.assertIn('does not support seek mode', str(e))
def testInvalidSeek(self):
"""Tests that seeking fails for unsupported seek arguments."""
daisy_chain_wrapper = DaisyChainWrapper(
self._dummy_url, self.test_data_file_len, self.MockDownloadCloudApi([]))
try:
# SEEK_CUR is invalid.
daisy_chain_wrapper.seek(0, whence=os.SEEK_CUR)
self.fail('Expected exception')
except IOError, e:
self.assertIn('does not support seek mode', str(e))
def testSeekAndReturn(self):
"""Tests seeking to the end of the wrapper (simulates getting size)."""
write_values = []
with open(self.test_data_file, 'rb') as stream:
while True:
data = stream.read(TRANSFER_BUFFER_SIZE)
if not data:
break
write_values.append(data)
upload_file = self.CreateTempFile()
mock_api = self.MockDownloadCloudApi(write_values)
daisy_chain_wrapper = DaisyChainWrapper(
self._dummy_url, self.test_data_file_len, mock_api,
download_chunk_size=self.test_data_file_len)
with open(upload_file, 'wb') as upload_stream:
current_position = 0
daisy_chain_wrapper.seek(0, whence=os.SEEK_END)
daisy_chain_wrapper.seek(current_position)
while True:
data = daisy_chain_wrapper.read(TRANSFER_BUFFER_SIZE)
current_position += len(data)
daisy_chain_wrapper.seek(0, whence=os.SEEK_END)
daisy_chain_wrapper.seek(current_position)
if not data:
break
upload_stream.write(data)
self.assertEquals(mock_api.get_calls, 1)
with open(upload_file, 'rb') as upload_stream:
with open(self.test_data_file, 'rb') as download_stream:
self.assertEqual(upload_stream.read(), download_stream.read())
def testSeekAndReturn(self):
"""Tests seeking to the end of the wrapper (simulates getting size)."""
write_values = []
with open(self.test_data_file, 'rb') as stream:
while True:
data = stream.read(TRANSFER_BUFFER_SIZE)
if not data:
break
write_values.append(data)
upload_file = self.CreateTempFile()
mock_api = self.MockDownloadCloudApi(write_values)
daisy_chain_wrapper = DaisyChainWrapper(
self._dummy_url,
self.test_data_file_len,
mock_api,
download_chunk_size=self.test_data_file_len)
with open(upload_file, 'wb') as upload_stream:
current_position = 0
daisy_chain_wrapper.seek(0, whence=os.SEEK_END)
daisy_chain_wrapper.seek(current_position)
while True:
data = daisy_chain_wrapper.read(TRANSFER_BUFFER_SIZE)
current_position += len(data)
daisy_chain_wrapper.seek(0, whence=os.SEEK_END)
daisy_chain_wrapper.seek(current_position)
if not data:
break
upload_stream.write(data)
self.assertEquals(mock_api.get_calls, 1)
with open(upload_file, 'rb') as upload_stream:
with open(self.test_data_file, 'rb') as download_stream:
self.assertEqual(upload_stream.read(), download_stream.read())
def testRestartDownloadThread(self):
"""Tests seek to non-stored position; this restarts the download thread."""
write_values = []
with open(self.test_data_file, 'rb') as stream:
while True:
data = stream.read(TRANSFER_BUFFER_SIZE)
if not data:
break
write_values.append(data)
upload_file = self.CreateTempFile()
mock_api = self.MockDownloadCloudApi(write_values)
daisy_chain_wrapper = DaisyChainWrapper(
self._dummy_url, self.test_data_file_len, mock_api,
download_chunk_size=self.test_data_file_len)
daisy_chain_wrapper.read(TRANSFER_BUFFER_SIZE)
daisy_chain_wrapper.read(TRANSFER_BUFFER_SIZE)
daisy_chain_wrapper.seek(0)
self._WriteFromWrapperToFile(daisy_chain_wrapper, upload_file)
self.assertEquals(mock_api.get_calls, 2)
with open(upload_file, 'rb') as upload_stream:
with open(self.test_data_file, 'rb') as download_stream:
self.assertEqual(upload_stream.read(), download_stream.read())
def testRestartDownloadThread(self):
"""Tests seek to non-stored position; this restarts the download thread."""
write_values = []
with open(self.test_data_file, 'rb') as stream:
while True:
data = stream.read(TRANSFER_BUFFER_SIZE)
if not data:
break
write_values.append(data)
upload_file = self.CreateTempFile()
mock_api = self.MockDownloadCloudApi(write_values)
daisy_chain_wrapper = DaisyChainWrapper(
self._dummy_url, self.test_data_file_len, mock_api,
download_chunk_size=self.test_data_file_len)
daisy_chain_wrapper.read(TRANSFER_BUFFER_SIZE)
daisy_chain_wrapper.read(TRANSFER_BUFFER_SIZE)
daisy_chain_wrapper.seek(0)
self._WriteFromWrapperToFile(daisy_chain_wrapper, upload_file)
self.assertEquals(mock_api.get_calls, 2)
with open(upload_file, 'rb') as upload_stream:
with open(self.test_data_file, 'rb') as download_stream:
self.assertEqual(upload_stream.read(), download_stream.read())
