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49 lines
1.9 KiB
Python
49 lines
1.9 KiB
Python
5 years ago
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from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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if MYPY_CHECK_RUNNING:
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from typing import Iterator
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def response_chunks(response, chunk_size=CONTENT_CHUNK_SIZE):
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# type: (Response, int) -> Iterator[bytes]
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"""Given a requests Response, provide the data chunks.
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"""
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try:
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# Special case for urllib3.
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for chunk in response.raw.stream(
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chunk_size,
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# We use decode_content=False here because we don't
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# want urllib3 to mess with the raw bytes we get
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# from the server. If we decompress inside of
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# urllib3 then we cannot verify the checksum
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# because the checksum will be of the compressed
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# file. This breakage will only occur if the
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# server adds a Content-Encoding header, which
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# depends on how the server was configured:
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# - Some servers will notice that the file isn't a
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# compressible file and will leave the file alone
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# and with an empty Content-Encoding
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# - Some servers will notice that the file is
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# already compressed and will leave the file
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# alone and will add a Content-Encoding: gzip
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# header
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# - Some servers won't notice anything at all and
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# will take a file that's already been compressed
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# and compress it again and set the
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# Content-Encoding: gzip header
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#
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# By setting this not to decode automatically we
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# hope to eliminate problems with the second case.
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decode_content=False,
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):
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yield chunk
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except AttributeError:
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# Standard file-like object.
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while True:
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chunk = response.raw.read(chunk_size)
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if not chunk:
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break
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yield chunk
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