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