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[PR #10088/29c3ca93 backport][3.11] Avoid calling len on the same data in the stream reader twice #10090

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5 changes: 3 additions & 2 deletions aiohttp/streams.py
Original file line number Diff line number Diff line change
Expand Up @@ -517,8 +517,9 @@ def _read_nowait_chunk(self, n: int) -> bytes:
else:
data = self._buffer.popleft()

self._size -= len(data)
self._cursor += len(data)
data_len = len(data)
self._size -= data_len
self._cursor += data_len

chunk_splits = self._http_chunk_splits
# Prevent memory leak: drop useless chunk splits
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