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