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"""Helper methods to tune a TCP connection"""
import asyncio
import socket
from contextlib import suppress
from typing import Optional # noqa
__all__ = ("tcp_keepalive", "tcp_nodelay")
if hasattr(socket, "SO_KEEPALIVE"):
def tcp_keepalive(transport: asyncio.Transport) -> None:
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: asyncio.Transport) -> None: # pragma: no cover
pass
def tcp_nodelay(transport: asyncio.Transport, value: bool) -> None:
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)