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"""Helper methods to tune a TCP connection"""
import socket
from contextlib import suppress
__all__ = ('tcp_keepalive', 'tcp_nodelay', 'tcp_cork')
if hasattr(socket, 'TCP_CORK'): # pragma: no cover
CORK = socket.TCP_CORK
elif hasattr(socket, 'TCP_NOPUSH'): # pragma: no cover
CORK = socket.TCP_NOPUSH
else: # pragma: no cover
CORK = None
if hasattr(socket, 'SO_KEEPALIVE'):
def tcp_keepalive(transport):
sock = transport.get_extra_info('socket')
if sock is not None:
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
else:
def tcp_keepalive(transport): # pragma: no cover
pass
def tcp_nodelay(transport, value):
sock = transport.get_extra_info('socket')
if sock is None:
return
if sock.family not in (socket.AF_INET, socket.AF_INET6):
return
value = bool(value)
# socket may be closed already, on windows OSError get raised
with suppress(OSError):
sock.setsockopt(
socket.IPPROTO_TCP, socket.TCP_NODELAY, value)
def tcp_cork(transport, value):
sock = transport.get_extra_info('socket')
if CORK is None:
return
if sock is None:
return
if sock.family not in (socket.AF_INET, socket.AF_INET6):
return
value = bool(value)
with suppress(OSError):
sock.setsockopt(
socket.IPPROTO_TCP, CORK, value)