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_transport.py
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68 lines (55 loc) · 1.96 KB
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"""Multicast DNS Service Discovery for Python, v0.14-wmcbrine
Copyright 2003 Paul Scott-Murphy, 2014 William McBrine
This module provides a framework for the use of DNS Service Discovery
using IP multicast.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA
"""
from __future__ import annotations
import asyncio
import socket
class _WrappedTransport:
"""A wrapper for transports."""
__slots__ = (
"fileno",
"is_ipv6",
"sock",
"sock_name",
"transport",
)
def __init__(
self,
transport: asyncio.DatagramTransport,
is_ipv6: bool,
sock: socket.socket,
fileno: int,
sock_name: tuple,
) -> None:
"""Initialize the wrapped transport.
These attributes are used when sending packets.
"""
self.transport = transport
self.is_ipv6 = is_ipv6
self.sock = sock
self.fileno = fileno
self.sock_name = sock_name
def make_wrapped_transport(transport: asyncio.DatagramTransport) -> _WrappedTransport:
"""Make a wrapped transport."""
sock: socket.socket = transport.get_extra_info("socket")
return _WrappedTransport(
transport=transport,
is_ipv6=sock.family == socket.AF_INET6,
sock=sock,
fileno=sock.fileno(),
sock_name=sock.getsockname(),
)