Python twisted.internet.interfaces.IReactorMulticast() Examples

def _join_multicast_groups(self):
        try:
            # Need to ensure that the passed-in reactor is, in fact, a "real"
            # reactor, and not None, or a mock reactor used in tests.
            verifyObject(IReactorMulticast, self.reactor)
        except DoesNotImplement:
            return
        if self.listen_port is None:
            self.listen_port = self.reactor.listenMulticast(
                self.port, self, interface=self.interface, listenMultiple=True
            )
        sock = self.transport.getHandle()
        if self.loopback:
            # This is only necessary for testing.
            self.transport.setLoopbackMode(self.loopback)
            set_ipv6_multicast_loopback(sock, self.loopback)
            self.transport.joinGroup(
                BEACON_IPV4_MULTICAST, interface="127.0.0.1"
            )
            # Loopback interface always has ifindex == 1.
            join_ipv6_beacon_group(sock, 1)
        for _, ifdata in self.interfaces.items():
            # Always try to join the IPv6 group on each interface.
            join_ipv6_beacon_group(sock, ifdata["index"])
            # Merely joining the group with the default parameters is not
            # enough, since we want to join the group on *all* interfaces.
            # So we need to join each group using an assigned IPv4 address
            # on each Ethernet interface.
            for ip in enumerate_ipv4_addresses(ifdata):
                self.transport.joinGroup(BEACON_IPV4_MULTICAST, interface=ip)
                # Use the first IP address on each interface. Since the
                # underlying interface is the same, joining using a
                # secondary IP address on the same interface will produce
                # an "Address already in use" error.
                break