76 lines
2.6 KiB
Python
76 lines
2.6 KiB
Python
import sys
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import struct
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import socket
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import typing
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from asyncio.protocols import DatagramProtocol
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from asyncio.transports import DatagramTransport
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from unittest import mock
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SOCKET_TYPES = (socket.SocketType, mock.MagicMock)
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if sys.version_info >= (3, 8): # pragma: no cover
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from asyncio.trsock import TransportSocket
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SOCKET_TYPES = (socket.SocketType, TransportSocket, mock.MagicMock)
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def _get_sock(transport: typing.Optional[DatagramTransport]) -> typing.Optional[socket.socket]:
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if transport is None or not hasattr(transport, "_extra"):
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return None
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sock: typing.Optional[socket.socket] = transport.get_extra_info('socket', None)
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assert sock is None or isinstance(sock, SOCKET_TYPES)
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return sock
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class MulticastProtocol(DatagramProtocol):
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def __init__(self, multicast_address: str, bind_address: str) -> None:
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self.multicast_address = multicast_address
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self.bind_address = bind_address
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self.transport: typing.Optional[DatagramTransport] = None
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@property
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def sock(self) -> typing.Optional[socket.socket]:
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return _get_sock(self.transport)
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def get_ttl(self) -> int:
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sock = self.sock
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if sock:
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return sock.getsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL)
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return 0
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def set_ttl(self, ttl: int = 1) -> None:
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sock = self.sock
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if sock:
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sock.setsockopt(
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socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, struct.pack('b', ttl)
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)
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return None
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def join_group(self, multicast_address: str, bind_address: str) -> None:
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sock = self.sock
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if sock:
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sock.setsockopt(
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socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP,
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socket.inet_aton(multicast_address) + socket.inet_aton(bind_address)
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)
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return None
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def leave_group(self, multicast_address: str, bind_address: str) -> None:
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sock = self.sock
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if sock:
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sock.setsockopt(
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socket.IPPROTO_IP, socket.IP_DROP_MEMBERSHIP,
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socket.inet_aton(multicast_address) + socket.inet_aton(bind_address)
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)
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return None
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def connection_made(self, transport: DatagramTransport) -> None: # type: ignore
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self.transport = transport
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return None
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@classmethod
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def create_multicast_socket(cls, bind_address: str) -> socket.socket:
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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sock.bind((bind_address, 0))
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sock.setblocking(False)
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return sock
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