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gh-135862: fix asyncio socket partial writes of non-1d-binary arrays by duaneg · Pull Request #135974 · python/cpython · GitHub

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gh-135862: fix asyncio socket partial writes of non-1d-binary arrays #135974

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gh-135862: fix asyncio socket partial writes of non-1d-binary arrays #135974

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55ca778
gh-135862: fix asyncio socket partial writes of non-1d-binary arrays
duaneg Jun 26, 2025
1aea967
Don't assume the byte size of arrays of longs
duaneg Jun 26, 2025
8ba5a97
Fix byte size calculation
duaneg Jun 26, 2025
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6 changes: 5 additions & 1 deletion Lib/asyncio/selector_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1077,7 +1077,11 @@ def write(self, data):
self._fatal_error(exc, 'Fatal write error on socket transport')
return
else:
data = memoryview(data)[n:]
if isinstance(data, memoryview):
data = data.cast('c')[n:]
else:
data = memoryview(data)[n:]
assert(data.itemsize == 1)
if not data:
return
# Not all was written; register write handler.
Expand Down
40 changes: 39 additions & 1 deletion Lib/test/test_asyncio/test_selector_events.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
"""Tests for selector_events.py"""

import array
import collections
import selectors
import socket
Expand All @@ -13,6 +14,11 @@
except ImportError:
ssl = None

try:
from _testbuffer import *
except ImportError:
ndarray = None

import asyncio
from asyncio.selector_events import (BaseSelectorEventLoop,
_SelectorDatagramTransport,
Expand Down Expand Up @@ -768,7 +774,39 @@ def test_write_partial_memoryview(self):
transport.write(data)

self.loop.assert_writer(7, transport._write_ready)
self.assertEqual(list_to_buffer([b'ta']), transport._buffer)
self.assertEqualBufferContents(b'ta', transport._buffer)

def test_write_partial_nonbyte_array_memview_write(self):
arr = array.array('l', [-1, 1])
data = memoryview(arr)

self.sock.send.return_value = len(arr) * data.itemsize // 2

transport = self.socket_transport()
transport.write(data)

self.loop.assert_writer(7, transport._write_ready)
remainder = memoryview(array.array('l', [1]))
self.assertEqualBufferContents(remainder.tobytes(), transport._buffer)

@unittest.skipUnless(ndarray, 'ndarray object required for this test')
def test_write_partial_ndarray_memview_write(self):
items = (-2, -1, 1, 2)
arr = ndarray(items, format='l', shape=(1, 2, 2))
data = memoryview(arr)

self.sock.send.return_value = arr.nbytes // 2

transport = self.socket_transport()
transport.write(data)

self.loop.assert_writer(7, transport._write_ready)
remainder = memoryview(array.array('l', (1, 2)))
self.assertEqualBufferContents(remainder.tobytes(), transport._buffer)

def assertEqualBufferContents(self, expected, buffer):
self.assertEqual(len(buffer), 1)
self.assertEqual(expected, buffer[0].tobytes())

def test_write_partial_none(self):
data = b'data'
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-06-26-22-12-13.gh-issue-135862.wYKSKx.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix bug where partial writes of :class:`memoryview` s of non-byte or 2+
dimensional arrays would write remaining binary data incorrectly.
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