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test_download.py
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# Copyright 2017 Google Inc.
#
# 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.
import http.client
import io
from unittest import mock
import pytest # type: ignore
from google.resumable_media import common
from google.resumable_media import _helpers
from google.resumable_media.requests import download as download_mod
from google.resumable_media.requests import _request_helpers
URL_PREFIX = "https://www.googleapis.com/download/storage/v1/b/{BUCKET}/o/"
EXAMPLE_URL = URL_PREFIX + "{OBJECT}?alt=media"
EXPECTED_TIMEOUT = (61, 60)
class TestDownload(object):
def test__write_to_stream_no_hash_check(self):
stream = io.BytesIO()
download = download_mod.Download(EXAMPLE_URL, stream=stream)
chunk1 = b"right now, "
chunk2 = b"but a little later"
response = _mock_response(chunks=[chunk1, chunk2], headers={})
ret_val = download._write_to_stream(response)
assert ret_val is None
assert stream.getvalue() == chunk1 + chunk2
assert download._bytes_downloaded == len(chunk1 + chunk2)
# Check mocks.
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.iter_content.assert_called_once_with(
chunk_size=_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_unicode=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c", None])
def test__write_to_stream_with_hash_check_success(self, checksum):
stream = io.BytesIO()
download = download_mod.Download(EXAMPLE_URL, stream=stream, checksum=checksum)
chunk1 = b"first chunk, count starting at 0. "
chunk2 = b"second chunk, or chunk 1, which is better? "
chunk3 = b"ordinals and numerals and stuff."
header_value = "crc32c=qmNCyg==,md5=fPAJHnnoi/+NadyNxT2c2w=="
headers = {_helpers._HASH_HEADER: header_value}
response = _mock_response(chunks=[chunk1, chunk2, chunk3], headers=headers)
ret_val = download._write_to_stream(response)
assert ret_val is None
assert stream.getvalue() == chunk1 + chunk2 + chunk3
assert download._bytes_downloaded == len(chunk1 + chunk2 + chunk3)
assert download._checksum_object is not None
# Check mocks.
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.iter_content.assert_called_once_with(
chunk_size=_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_unicode=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test__write_to_stream_with_hash_check_fail(self, checksum):
stream = io.BytesIO()
download = download_mod.Download(EXAMPLE_URL, stream=stream, checksum=checksum)
chunk1 = b"first chunk, count starting at 0. "
chunk2 = b"second chunk, or chunk 1, which is better? "
chunk3 = b"ordinals and numerals and stuff."
bad_checksum = "d3JvbmcgbiBtYWRlIHVwIQ=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers = {_helpers._HASH_HEADER: header_value}
response = _mock_response(chunks=[chunk1, chunk2, chunk3], headers=headers)
with pytest.raises(common.DataCorruption) as exc_info:
download._write_to_stream(response)
assert not download.finished
error = exc_info.value
assert error.response is response
assert len(error.args) == 1
if checksum == "md5":
good_checksum = "fPAJHnnoi/+NadyNxT2c2w=="
else:
good_checksum = "qmNCyg=="
msg = download_mod._CHECKSUM_MISMATCH.format(
EXAMPLE_URL, bad_checksum, good_checksum, checksum_type=checksum.upper()
)
assert msg in error.args[0]
assert (
f"The download request read {download._bytes_downloaded} bytes of data."
in error.args[0]
)
# Check mocks.
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.iter_content.assert_called_once_with(
chunk_size=_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_unicode=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test__write_to_stream_no_checksum_validation_for_partial_response(
self, checksum
):
stream = io.BytesIO()
download = download_mod.Download(EXAMPLE_URL, stream=stream, checksum=checksum)
chunk1 = b"first chunk"
response = _mock_response(
status_code=http.client.PARTIAL_CONTENT, chunks=[chunk1]
)
# Make sure that the checksum is not validated.
with mock.patch(
"google.resumable_media._helpers.prepare_checksum_digest",
return_value=None,
) as prepare_checksum_digest:
download._write_to_stream(response)
assert not prepare_checksum_digest.called
assert not download.finished
# Check mocks.
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.iter_content.assert_called_once_with(
chunk_size=_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_unicode=False
)
def test__write_to_stream_with_invalid_checksum_type(self):
BAD_CHECKSUM_TYPE = "badsum"
stream = io.BytesIO()
download = download_mod.Download(
EXAMPLE_URL, stream=stream, checksum=BAD_CHECKSUM_TYPE
)
chunk1 = b"first chunk, count starting at 0. "
chunk2 = b"second chunk, or chunk 1, which is better? "
chunk3 = b"ordinals and numerals and stuff."
bad_checksum = "d3JvbmcgbiBtYWRlIHVwIQ=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers = {_helpers._HASH_HEADER: header_value}
response = _mock_response(chunks=[chunk1, chunk2, chunk3], headers=headers)
with pytest.raises(ValueError) as exc_info:
download._write_to_stream(response)
assert not download.finished
error = exc_info.value
assert error.args[0] == "checksum must be ``'md5'``, ``'crc32c'`` or ``None``"
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test__write_to_stream_incomplete_read(self, checksum):
stream = io.BytesIO()
download = download_mod.Download(EXAMPLE_URL, stream=stream, checksum=checksum)
chunk1 = b"first chunk"
mock_full_content_length = len(chunk1) + 123
headers = {"x-goog-stored-content-length": mock_full_content_length}
bad_checksum = "d3JvbmcgbiBtYWRlIHVwIQ=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers[_helpers._HASH_HEADER] = header_value
response = _mock_response(chunks=[chunk1], headers=headers)
with pytest.raises(ConnectionError) as exc_info:
download._write_to_stream(response)
assert not download.finished
error = exc_info.value
assert (
f"The download request read {download._bytes_downloaded} bytes of data."
in error.args[0]
)
def _consume_helper(
self,
stream=None,
end=65536,
headers=None,
chunks=(),
response_headers=None,
checksum="md5",
timeout=None,
):
download = download_mod.Download(
EXAMPLE_URL, stream=stream, end=end, headers=headers, checksum=checksum
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_response(
chunks=chunks, headers=response_headers
)
assert not download.finished
if timeout is not None:
ret_val = download.consume(transport, timeout=timeout)
else:
ret_val = download.consume(transport)
assert ret_val is transport.request.return_value
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT if timeout is None else timeout,
}
if chunks:
assert stream is not None
called_kwargs["stream"] = True
transport.request.assert_called_once_with("GET", EXAMPLE_URL, **called_kwargs)
range_bytes = "bytes={:d}-{:d}".format(0, end)
assert download._headers["range"] == range_bytes
assert download.finished
return transport
def test_consume(self):
self._consume_helper()
def test_consume_with_custom_timeout(self):
self._consume_helper(timeout=14.7)
@pytest.mark.parametrize("checksum", ["md5", "crc32c", None])
def test_consume_with_stream(self, checksum):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
transport = self._consume_helper(
stream=stream, chunks=chunks, checksum=checksum
)
assert stream.getvalue() == b"".join(chunks)
# Check mocks.
response = transport.request.return_value
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.iter_content.assert_called_once_with(
chunk_size=_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_unicode=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test_consume_with_stream_hash_check_success(self, checksum):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
header_value = "crc32c=UNIQxg==,md5=JvS1wjMvfbCXgEGeaJJLDQ=="
headers = {_helpers._HASH_HEADER: header_value}
transport = self._consume_helper(
stream=stream, chunks=chunks, response_headers=headers, checksum=checksum
)
assert stream.getvalue() == b"".join(chunks)
# Check mocks.
response = transport.request.return_value
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.iter_content.assert_called_once_with(
chunk_size=_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_unicode=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test_consume_with_stream_hash_check_fail(self, checksum):
stream = io.BytesIO()
download = download_mod.Download(EXAMPLE_URL, stream=stream, checksum=checksum)
chunks = (b"zero zero", b"niner tango")
bad_checksum = "anVzdCBub3QgdGhpcyAxLA=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers = {_helpers._HASH_HEADER: header_value}
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_response(chunks=chunks, headers=headers)
assert not download.finished
with pytest.raises(common.DataCorruption) as exc_info:
download.consume(transport)
assert stream.getvalue() == b"".join(chunks)
assert download.finished
assert download._headers == {}
error = exc_info.value
assert error.response is transport.request.return_value
assert len(error.args) == 1
if checksum == "md5":
good_checksum = "1A/dxEpys717C6FH7FIWDw=="
else:
good_checksum = "GvNZlg=="
msg = download_mod._CHECKSUM_MISMATCH.format(
EXAMPLE_URL, bad_checksum, good_checksum, checksum_type=checksum.upper()
)
assert msg in error.args[0]
assert (
f"The download request read {download._bytes_downloaded} bytes of data."
in error.args[0]
)
# Check mocks.
transport.request.assert_called_once_with(
"GET",
EXAMPLE_URL,
data=None,
headers={},
stream=True,
timeout=EXPECTED_TIMEOUT,
)
def test_consume_with_headers(self):
headers = {} # Empty headers
end = 16383
self._consume_helper(end=end, headers=headers)
range_bytes = "bytes={:d}-{:d}".format(0, end)
# Make sure the headers have been modified.
assert headers == {"range": range_bytes}
def test_consume_gets_generation_from_url(self):
GENERATION_VALUE = 1641590104888641
url = EXAMPLE_URL + f"&generation={GENERATION_VALUE}"
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
download = download_mod.Download(
url, stream=stream, end=65536, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_response(chunks=chunks, headers=None)
assert not download.finished
assert download._object_generation is None
ret_val = download.consume(transport)
assert download._object_generation == GENERATION_VALUE
assert ret_val is transport.request.return_value
assert stream.getvalue() == b"".join(chunks)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", url, **called_kwargs)
def test_consume_gets_generation_from_headers(self):
GENERATION_VALUE = 1641590104888641
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
download = download_mod.Download(
EXAMPLE_URL, stream=stream, end=65536, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
headers = {_helpers._GENERATION_HEADER: GENERATION_VALUE}
transport.request.return_value = _mock_response(chunks=chunks, headers=headers)
assert not download.finished
assert download._object_generation is None
ret_val = download.consume(transport)
assert download._object_generation == GENERATION_VALUE
assert ret_val is transport.request.return_value
assert stream.getvalue() == b"".join(chunks)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", EXAMPLE_URL, **called_kwargs)
def test_consume_w_object_generation(self):
GENERATION_VALUE = 1641590104888641
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
end = 65536
download = download_mod.Download(
EXAMPLE_URL, stream=stream, end=end, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_response(chunks=chunks, headers=None)
assert download._object_generation is None
# Mock a retry operation with object generation retrieved and bytes already downloaded in the stream
download._object_generation = GENERATION_VALUE
offset = 256
download._bytes_downloaded = offset
download.consume(transport)
expected_url = EXAMPLE_URL + f"&generation={GENERATION_VALUE}"
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", expected_url, **called_kwargs)
range_bytes = "bytes={:d}-{:d}".format(offset, end)
assert download._headers["range"] == range_bytes
def test_consume_w_bytes_downloaded(self):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
end = 65536
download = download_mod.Download(
EXAMPLE_URL, stream=stream, end=end, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_response(chunks=chunks, headers=None)
assert download._bytes_downloaded == 0
# Mock a retry operation with bytes already downloaded in the stream and checksum stored
offset = 256
download._bytes_downloaded = offset
download._expected_checksum = None
download._checksum_object = _helpers._DoNothingHash()
download.consume(transport)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", EXAMPLE_URL, **called_kwargs)
range_bytes = "bytes={:d}-{:d}".format(offset, end)
assert download._headers["range"] == range_bytes
def test_consume_w_bytes_downloaded_range_read(self):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
start = 1024
end = 65536
download = download_mod.Download(
EXAMPLE_URL,
stream=stream,
start=start,
end=end,
headers=None,
checksum="md5",
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_response(chunks=chunks, headers=None)
assert download._bytes_downloaded == 0
# Mock a retry operation with bytes already downloaded in the stream and checksum stored
offset = 256
download._bytes_downloaded = offset
download._expected_checksum = None
download._checksum_object = _helpers._DoNothingHash()
download.consume(transport)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", EXAMPLE_URL, **called_kwargs)
range_bytes = "bytes={:d}-{:d}".format(offset + start, end)
assert download._headers["range"] == range_bytes
def test_consume_gzip_reset_stream_w_bytes_downloaded(self):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
end = 65536
download = download_mod.Download(
EXAMPLE_URL, stream=stream, end=end, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
# Mock a decompressive transcoding retry operation with bytes already downloaded in the stream
headers = {_helpers._STORED_CONTENT_ENCODING_HEADER: "gzip"}
transport.request.return_value = _mock_response(chunks=chunks, headers=headers)
offset = 16
download._bytes_downloaded = offset
download.consume(transport)
assert stream.getvalue() == b"".join(chunks)
assert download._bytes_downloaded == len(b"".join(chunks))
def test_consume_gzip_reset_stream_error(self):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
end = 65536
download = download_mod.Download(
EXAMPLE_URL, stream=stream, end=end, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
# Mock a stream seek error while resuming a decompressive transcoding download
stream.seek = mock.Mock(side_effect=OSError("mock stream seek error"))
headers = {_helpers._STORED_CONTENT_ENCODING_HEADER: "gzip"}
transport.request.return_value = _mock_response(chunks=chunks, headers=headers)
offset = 16
download._bytes_downloaded = offset
with pytest.raises(Exception):
download.consume(transport)
class TestRawDownload(object):
def test__write_to_stream_no_hash_check(self):
stream = io.BytesIO()
download = download_mod.RawDownload(EXAMPLE_URL, stream=stream)
chunk1 = b"right now, "
chunk2 = b"but a little later"
response = _mock_raw_response(chunks=[chunk1, chunk2], headers={})
ret_val = download._write_to_stream(response)
assert ret_val is None
assert stream.getvalue() == chunk1 + chunk2
assert download._bytes_downloaded == len(chunk1 + chunk2)
# Check mocks.
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.raw.stream.assert_called_once_with(
_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_content=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c", None])
def test__write_to_stream_with_hash_check_success(self, checksum):
stream = io.BytesIO()
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, checksum=checksum
)
chunk1 = b"first chunk, count starting at 0. "
chunk2 = b"second chunk, or chunk 1, which is better? "
chunk3 = b"ordinals and numerals and stuff."
header_value = "crc32c=qmNCyg==,md5=fPAJHnnoi/+NadyNxT2c2w=="
headers = {_helpers._HASH_HEADER: header_value}
response = _mock_raw_response(chunks=[chunk1, chunk2, chunk3], headers=headers)
ret_val = download._write_to_stream(response)
assert ret_val is None
assert stream.getvalue() == chunk1 + chunk2 + chunk3
assert download._bytes_downloaded == len(chunk1 + chunk2 + chunk3)
assert download._checksum_object is not None
# Check mocks.
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.raw.stream.assert_called_once_with(
_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_content=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test__write_to_stream_with_hash_check_fail(self, checksum):
stream = io.BytesIO()
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, checksum=checksum
)
chunk1 = b"first chunk, count starting at 0. "
chunk2 = b"second chunk, or chunk 1, which is better? "
chunk3 = b"ordinals and numerals and stuff."
bad_checksum = "d3JvbmcgbiBtYWRlIHVwIQ=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers = {_helpers._HASH_HEADER: header_value}
response = _mock_raw_response(chunks=[chunk1, chunk2, chunk3], headers=headers)
with pytest.raises(common.DataCorruption) as exc_info:
download._write_to_stream(response)
assert not download.finished
error = exc_info.value
assert error.response is response
assert len(error.args) == 1
if checksum == "md5":
good_checksum = "fPAJHnnoi/+NadyNxT2c2w=="
else:
good_checksum = "qmNCyg=="
msg = download_mod._CHECKSUM_MISMATCH.format(
EXAMPLE_URL, bad_checksum, good_checksum, checksum_type=checksum.upper()
)
assert msg in error.args[0]
assert (
f"The download request read {download._bytes_downloaded} bytes of data."
in error.args[0]
)
# Check mocks.
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.raw.stream.assert_called_once_with(
_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_content=False
)
def test__write_to_stream_with_invalid_checksum_type(self):
BAD_CHECKSUM_TYPE = "badsum"
stream = io.BytesIO()
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, checksum=BAD_CHECKSUM_TYPE
)
chunk1 = b"first chunk, count starting at 0. "
chunk2 = b"second chunk, or chunk 1, which is better? "
chunk3 = b"ordinals and numerals and stuff."
bad_checksum = "d3JvbmcgbiBtYWRlIHVwIQ=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers = {_helpers._HASH_HEADER: header_value}
response = _mock_response(chunks=[chunk1, chunk2, chunk3], headers=headers)
with pytest.raises(ValueError) as exc_info:
download._write_to_stream(response)
assert not download.finished
error = exc_info.value
assert error.args[0] == "checksum must be ``'md5'``, ``'crc32c'`` or ``None``"
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test__write_to_stream_incomplete_read(self, checksum):
stream = io.BytesIO()
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, checksum=checksum
)
chunk1 = b"first chunk"
mock_full_content_length = len(chunk1) + 123
headers = {"x-goog-stored-content-length": mock_full_content_length}
bad_checksum = "d3JvbmcgbiBtYWRlIHVwIQ=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers[_helpers._HASH_HEADER] = header_value
response = _mock_raw_response(chunks=[chunk1], headers=headers)
with pytest.raises(ConnectionError) as exc_info:
download._write_to_stream(response)
assert not download.finished
error = exc_info.value
assert (
f"The download request read {download._bytes_downloaded} bytes of data."
in error.args[0]
)
def _consume_helper(
self,
stream=None,
end=65536,
headers=None,
chunks=(),
response_headers=None,
checksum=None,
timeout=None,
):
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, end=end, headers=headers, checksum=checksum
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_raw_response(
chunks=chunks, headers=response_headers
)
assert not download.finished
if timeout is not None:
ret_val = download.consume(transport, timeout=timeout)
else:
ret_val = download.consume(transport)
assert ret_val is transport.request.return_value
if chunks:
assert stream is not None
transport.request.assert_called_once_with(
"GET",
EXAMPLE_URL,
data=None,
headers=download._headers,
stream=True,
timeout=EXPECTED_TIMEOUT if timeout is None else timeout,
)
range_bytes = "bytes={:d}-{:d}".format(0, end)
assert download._headers["range"] == range_bytes
assert download.finished
return transport
def test_consume(self):
self._consume_helper()
def test_consume_with_custom_timeout(self):
self._consume_helper(timeout=14.7)
@pytest.mark.parametrize("checksum", ["md5", "crc32c", None])
def test_consume_with_stream(self, checksum):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
transport = self._consume_helper(
stream=stream, chunks=chunks, checksum=checksum
)
assert stream.getvalue() == b"".join(chunks)
# Check mocks.
response = transport.request.return_value
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.raw.stream.assert_called_once_with(
_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_content=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test_consume_with_stream_hash_check_success(self, checksum):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
header_value = "crc32c=UNIQxg==,md5=JvS1wjMvfbCXgEGeaJJLDQ=="
headers = {_helpers._HASH_HEADER: header_value}
transport = self._consume_helper(
stream=stream, chunks=chunks, response_headers=headers, checksum=checksum
)
assert stream.getvalue() == b"".join(chunks)
# Check mocks.
response = transport.request.return_value
response.__enter__.assert_called_once_with()
response.__exit__.assert_called_once_with(None, None, None)
response.raw.stream.assert_called_once_with(
_request_helpers._SINGLE_GET_CHUNK_SIZE, decode_content=False
)
@pytest.mark.parametrize("checksum", ["md5", "crc32c"])
def test_consume_with_stream_hash_check_fail(self, checksum):
stream = io.BytesIO()
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, checksum=checksum
)
chunks = (b"zero zero", b"niner tango")
bad_checksum = "anVzdCBub3QgdGhpcyAxLA=="
header_value = "crc32c={bad},md5={bad}".format(bad=bad_checksum)
headers = {_helpers._HASH_HEADER: header_value}
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_raw_response(
chunks=chunks, headers=headers
)
assert not download.finished
with pytest.raises(common.DataCorruption) as exc_info:
download.consume(transport)
assert stream.getvalue() == b"".join(chunks)
assert download.finished
assert download._headers == {}
error = exc_info.value
assert error.response is transport.request.return_value
assert len(error.args) == 1
if checksum == "md5":
good_checksum = "1A/dxEpys717C6FH7FIWDw=="
else:
good_checksum = "GvNZlg=="
msg = download_mod._CHECKSUM_MISMATCH.format(
EXAMPLE_URL, bad_checksum, good_checksum, checksum_type=checksum.upper()
)
assert msg in error.args[0]
assert (
f"The download request read {download._bytes_downloaded} bytes of data."
in error.args[0]
)
# Check mocks.
transport.request.assert_called_once_with(
"GET",
EXAMPLE_URL,
data=None,
headers={},
stream=True,
timeout=EXPECTED_TIMEOUT,
)
def test_consume_with_headers(self):
headers = {} # Empty headers
end = 16383
self._consume_helper(end=end, headers=headers)
range_bytes = "bytes={:d}-{:d}".format(0, end)
# Make sure the headers have been modified.
assert headers == {"range": range_bytes}
def test_consume_gets_generation_from_url(self):
GENERATION_VALUE = 1641590104888641
url = EXAMPLE_URL + f"&generation={GENERATION_VALUE}"
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
download = download_mod.RawDownload(
url, stream=stream, end=65536, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_raw_response(chunks=chunks, headers=None)
assert not download.finished
assert download._object_generation is None
ret_val = download.consume(transport)
assert download._object_generation == GENERATION_VALUE
assert ret_val is transport.request.return_value
assert stream.getvalue() == b"".join(chunks)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", url, **called_kwargs)
def test_consume_gets_generation_from_headers(self):
GENERATION_VALUE = 1641590104888641
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, end=65536, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
headers = {_helpers._GENERATION_HEADER: GENERATION_VALUE}
transport.request.return_value = _mock_raw_response(
chunks=chunks, headers=headers
)
assert not download.finished
assert download._object_generation is None
ret_val = download.consume(transport)
assert download._object_generation == GENERATION_VALUE
assert ret_val is transport.request.return_value
assert stream.getvalue() == b"".join(chunks)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", EXAMPLE_URL, **called_kwargs)
def test_consume_w_object_generation(self):
GENERATION_VALUE = 1641590104888641
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
end = 65536
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, end=end, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_raw_response(chunks=chunks, headers=None)
assert download._object_generation is None
# Mock a retry operation with object generation retrieved and bytes already downloaded in the stream
download._object_generation = GENERATION_VALUE
offset = 256
download._bytes_downloaded = offset
download.consume(transport)
expected_url = EXAMPLE_URL + f"&generation={GENERATION_VALUE}"
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", expected_url, **called_kwargs)
range_bytes = "bytes={:d}-{:d}".format(offset, end)
assert download._headers["range"] == range_bytes
def test_consume_w_bytes_downloaded(self):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
end = 65536
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, end=end, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_raw_response(chunks=chunks, headers=None)
assert download._bytes_downloaded == 0
# Mock a retry operation with bytes already downloaded in the stream and checksum stored
offset = 256
download._bytes_downloaded = offset
download._expected_checksum = None
download._checksum_object = _helpers._DoNothingHash()
download.consume(transport)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", EXAMPLE_URL, **called_kwargs)
range_bytes = "bytes={:d}-{:d}".format(offset, end)
assert download._headers["range"] == range_bytes
def test_consume_w_bytes_downloaded_range_read(self):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
start = 1024
end = 65536
download = download_mod.RawDownload(
EXAMPLE_URL,
stream=stream,
start=start,
end=end,
headers=None,
checksum="md5",
)
transport = mock.Mock(spec=["request"])
transport.request.return_value = _mock_raw_response(chunks=chunks, headers=None)
assert download._bytes_downloaded == 0
# Mock a retry operation with bytes already downloaded in the stream and checksum stored
offset = 256
download._bytes_downloaded = offset
download._expected_checksum = None
download._checksum_object = _helpers._DoNothingHash()
download.consume(transport)
called_kwargs = {
"data": None,
"headers": download._headers,
"timeout": EXPECTED_TIMEOUT,
"stream": True,
}
transport.request.assert_called_once_with("GET", EXAMPLE_URL, **called_kwargs)
range_bytes = "bytes={:d}-{:d}".format(start + offset, end)
assert download._headers["range"] == range_bytes
def test_consume_gzip_reset_stream_w_bytes_downloaded(self):
stream = io.BytesIO()
chunks = (b"up down ", b"charlie ", b"brown")
end = 65536
download = download_mod.RawDownload(
EXAMPLE_URL, stream=stream, end=end, headers=None, checksum="md5"
)
transport = mock.Mock(spec=["request"])
# Mock a decompressive transcoding retry operation with bytes already downloaded in the stream
headers = {_helpers._STORED_CONTENT_ENCODING_HEADER: "gzip"}
transport.request.return_value = _mock_raw_response(
chunks=chunks, headers=headers
)
offset = 16
download._bytes_downloaded = offset
download.consume(transport)
assert stream.getvalue() == b"".join(chunks)
assert download._bytes_downloaded == len(b"".join(chunks))