def test_deflate_streaming_tell_intermediate_point(self):
# Ensure that ``tell()`` returns the correct number of bytes when
# part-way through streaming compressed content.
NUMBER_OF_READS = 10
class MockCompressedDataReading(BytesIO):
"""
A BytesIO-like reader returning ``payload`` in ``NUMBER_OF_READS``
calls to ``read``.
"""
def __init__(self, payload, payload_part_size):
self.payloads = [
payload[i * payload_part_size:(i + 1) * payload_part_size]
for i in range(NUMBER_OF_READS + 1)
]
self.consumed = 0
assert b"".join(self.payloads) == payload
def read(self, _):
# Amount is unused.
if len(self.payloads) > 0:
payload = self.payloads.pop(0)
self.consumed += len(payload)
return payload
return b""
def __iter__(self):
return self
def __next__(self):
if not self.payloads:
raise StopIteration()
return self.read(None)
next = __next__
uncompressed_data = zlib.decompress(ZLIB_PAYLOAD)
payload_part_size = len(ZLIB_PAYLOAD) // NUMBER_OF_READS
fp = MockCompressedDataReading(ZLIB_PAYLOAD, payload_part_size)
resp = HTTPResponse(fp, headers={"content-encoding": "deflate"})
parts = []
stream = resp.stream(1)
for part in stream:
parts.append(part)
assert resp.tell() == fp.consumed
end_of_stream = resp.tell()
with pytest.raises(StopIteration):
next(stream)
# Check that the payload is equal to the uncompressed data
payload = b"".join(parts)
assert uncompressed_data == payload
# Check that the end of the stream is in the correct place
assert len(ZLIB_PAYLOAD) == end_of_stream
def test_streaming_tell(self):
fp = [b"fo", b"o"]
resp = HTTPResponse(fp)
stream = resp.stream(decode_content=False)
position = 0
position += len(next(stream))
assert 2 == position
assert 2 == resp.tell()
position += len(next(stream))
assert 3 == position
assert 3 == resp.tell()
with pytest.raises(StopIteration):
next(stream)
def test_gzipped_streaming_tell(self):
compress = zlib.compressobj(6, zlib.DEFLATED, 16 + zlib.MAX_WBITS)
uncompressed_data = b"foo"
data = compress.compress(uncompressed_data)
data += compress.flush()
fp = BytesIO(data)
resp = HTTPResponse(fp, headers={"content-encoding": "gzip"})
stream = resp.stream()
# Read everything
payload = next(stream)
assert payload == uncompressed_data
assert len(data) == resp.tell()
with pytest.raises(StopIteration):
next(stream)
