lbry-sdk/lbrynet/dht/contact.py

class Contact(object):
    """ Encapsulation for remote contact

    This class contains information on a single remote contact, and also
    provides a direct RPC API to the remote node which it represents
    """

    def __init__(self, id, ipAddress, udpPort, networkProtocol, firstComm=0):
        self.id = id
        self.address = ipAddress
        self.port = udpPort
        self._networkProtocol = networkProtocol
        self.commTime = firstComm

    def __eq__(self, other):
        if isinstance(other, Contact):
            return self.id == other.id
        elif isinstance(other, str):
            return self.id == other
        else:
            return False

    def __ne__(self, other):
        if isinstance(other, Contact):
            return self.id != other.id
        elif isinstance(other, str):
            return self.id != other
        else:
            return True

    def compact_ip(self):
        compact_ip = reduce(
            lambda buff, x: buff + bytearray([int(x)]), self.address.split('.'), bytearray())
        return str(compact_ip)

    def __str__(self):
        return '<%s.%s object; IP address: %s, UDP port: %d>' % (
            self.__module__, self.__class__.__name__, self.address, self.port)

    def __getattr__(self, name):
        """ This override allows the host node to call a method of the remote
        node (i.e. this contact) as if it was a local function.

        For instance, if C{remoteNode} is a instance of C{Contact}, the
        following will result in C{remoteNode}'s C{test()} method to be
        called with argument C{123}::
         remoteNode.test(123)

        Such a RPC method call will return a Deferred, which will callback
        when the contact responds with the result (or an error occurs).
        This happens via this contact's C{_networkProtocol} object (i.e. the
        host Node's C{_protocol} object).
        """

        def _sendRPC(*args, **kwargs):
            return self._networkProtocol.sendRPC(self, name, args, **kwargs)

        return _sendRPC