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61 lines
2.2 KiB
61 lines
2.2 KiB
# ADN DMR Peer Server - UDP receive buffer sizing
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# Copyright (C) 2026 Rodrigo Pérez, CE5RPY <ce5rpy@qmd.cl>
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#
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###############################################################################
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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###############################################################################
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"""Raise SO_RCVBUF on voice UDP listeners to avoid kernel RcvbufErrors under load."""
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from __future__ import annotations
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import logging
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import socket
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from typing import Any
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DEFAULT_UDP_RCVBUF = 4 * 1024 * 1024
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def udp_rcvbuf_bytes(config: dict[str, Any] | None) -> int:
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if not config:
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return DEFAULT_UDP_RCVBUF
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raw = config.get("GLOBAL", {}).get("UDP_RCVBUF", DEFAULT_UDP_RCVBUF)
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if isinstance(raw, bool) or not isinstance(raw, int) or raw <= 0:
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return DEFAULT_UDP_RCVBUF
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return raw
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def apply_udp_rcvbuf(
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sock: socket.socket,
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requested: int,
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*,
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label: str,
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logger: logging.Logger,
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) -> None:
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try:
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, requested)
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except OSError as exc:
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logger.warning("(%s) UDP RX buffer not raised (requested %s): %s", label, requested, exc)
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return
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try:
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effective = sock.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
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except OSError as exc:
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logger.warning("(%s) UDP RX buffer set but getsockopt failed: %s", label, exc)
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return
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logger.info("(%s) UDP RX buffer raised to %s bytes (requested %s)", label, effective, requested)
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__all__ = ["DEFAULT_UDP_RCVBUF", "apply_udp_rcvbuf", "udp_rcvbuf_bytes"]
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