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f45232635c
* Remove unicode text prefixes. * Replace str.format() uses with f-strings. * Replace % with f-strings, and do some cleanup. * Fix wrong variable. * Avoid unnecessary string conversion.
64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
# Copyright (c) 2019-2021, Felix Fontein <felix@fontein.de>
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# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
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# SPDX-License-Identifier: GPL-3.0-or-later
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from __future__ import annotations
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import fcntl
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import os
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import os.path
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import socket as pysocket
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def make_file_unblocking(file):
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fcntl.fcntl(file.fileno(), fcntl.F_SETFL, fcntl.fcntl(file.fileno(), fcntl.F_GETFL) | os.O_NONBLOCK)
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def make_file_blocking(file):
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fcntl.fcntl(file.fileno(), fcntl.F_SETFL, fcntl.fcntl(file.fileno(), fcntl.F_GETFL) & ~os.O_NONBLOCK)
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def make_unblocking(sock):
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if hasattr(sock, '_sock'):
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sock._sock.setblocking(0)
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elif hasattr(sock, 'setblocking'):
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sock.setblocking(0)
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else:
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make_file_unblocking(sock)
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def _empty_writer(msg):
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pass
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def shutdown_writing(sock, log=_empty_writer):
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# FIXME: This does **not work with SSLSocket**! Apparently SSLSocket does not allow to send
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# a close_notify TLS alert without completely shutting down the connection.
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# Calling sock.shutdown(pysocket.SHUT_WR) simply turns of TLS encryption and from that
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# point on the raw encrypted data is returned when sock.recv() is called. :-(
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if hasattr(sock, 'shutdown_write'):
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sock.shutdown_write()
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elif hasattr(sock, 'shutdown'):
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try:
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sock.shutdown(pysocket.SHUT_WR)
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except TypeError as e:
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# probably: "TypeError: shutdown() takes 1 positional argument but 2 were given"
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log(f'Shutting down for writing not possible; trying shutdown instead: {e}')
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sock.shutdown()
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elif isinstance(sock, getattr(pysocket, 'SocketIO')):
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sock._sock.shutdown(pysocket.SHUT_WR)
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else:
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log('No idea how to signal end of writing')
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def write_to_socket(sock, data):
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if hasattr(sock, '_send_until_done'):
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# WrappedSocket (urllib3/contrib/pyopenssl) does not have `send`, but
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# only `sendall`, which uses `_send_until_done` under the hood.
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return sock._send_until_done(data)
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elif hasattr(sock, 'send'):
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return sock.send(data)
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else:
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return os.write(sock.fileno(), data)
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