How to use the mitogen.core.Message function in mitogen

:param int handle:
            :data:`mitogen.core.ADD_ROUTE` or :data:`mitogen.core.DEL_ROUTE`
        :param int target_id:
            ID of the connecting or disconnecting context.
        :param str name:
            Context name or :data:`None`.
        """
        if not stream:
            # We may not have a stream during shutdown.
            return

        data = str(target_id)
        if name:
            data = '%s:%s' % (target_id, name)
        stream.protocol.send(
            mitogen.core.Message(
                handle=handle,
                data=data.encode('utf-8'),
                dst_id=stream.protocol.remote_id,
            )

def _receive_one(self, broker):
        if self._input_buf_len < Message.HEADER_LEN:
            return False

        msg = Message()
        msg.router = self._router
        (magic, msg.dst_id, msg.src_id, msg.auth_id,
         msg.handle, msg.reply_to, msg_len) = struct.unpack(
            Message.HEADER_FMT,
            self._input_buf[0][:Message.HEADER_LEN],
        )

        if magic != Message.HEADER_MAGIC:
            LOG.error(self.corrupt_msg, self.stream.name, self._input_buf[0][:2048])
            self.stream.on_disconnect(broker)
            return False

        if msg_len > self._router.max_message_size:
            LOG.error('Maximum message size exceeded (got %d, max %d)',
                      msg_len, self._router.max_message_size)
            self.stream.on_disconnect(broker)
            return False

        total_len = msg_len + Message.HEADER_LEN
        if self._input_buf_len < total_len:
            _vv and IOLOG.debug(
                '%r: Input too short (want %d, got %d)',
                self, msg_len, self._input_buf_len - Message.HEADER_LEN
            )

def _send_one_module(self, stream, tup):
        if tup[0] not in stream.protocol.sent_modules:
            stream.protocol.sent_modules.add(tup[0])
            self.router._async_route(
                mitogen.core.Message.pickled(
                    tup,
                    dst_id=stream.protocol.remote_id,
                    handle=mitogen.core.LOAD_MODULE,
                )

def on_shutdown(self, broker):
        """
        Called during :meth:`Broker.shutdown`, informs callbacks registered
        with :meth:`add_handle_cb` the connection is dead.
        """
        _v and LOG.debug('%r: shutting down', self, broker)
        fire(self, 'shutdown')
        for handle, (persist, fn) in self._handle_map.iteritems():
            _v and LOG.debug('%r.on_shutdown(): killing %r: %r', self, handle, fn)
            fn(Message.dead(self.broker_shutdown_msg))

def on_shutdown(self, broker):
        """
        Respond to the broker's request for the stream to shut down by sending
        SHUTDOWN to the child.
        """
        LOG.debug('%r: requesting child shutdown', self)
        self._send(
            mitogen.core.Message(
                src_id=mitogen.context_id,
                dst_id=self.remote_id,
                handle=mitogen.core.SHUTDOWN,
            )

def reply(self, msg, router=None, **kwargs):
        """
        Compose a reply to this message and send it using :attr:`router`, or
        `router` is :attr:`router` is :data:`None`.

        :param obj:
            Either a :class:`Message`, or an object to be serialized in order
            to construct a new message.
        :param router:
            Optional router to use if :attr:`router` is :data:`None`.
        :param kwargs:
            Optional keyword parameters overriding message fields in the reply.
        """
        if not isinstance(msg, Message):
            msg = Message.pickled(msg)
        msg.dst_id = self.src_id
        msg.handle = self.reply_to
        vars(msg).update(kwargs)
        if msg.handle:
            (self.router or router).route(msg)
        else:
            LOG.debug('dropping reply to message with no return address: %r',
                      msg)

:param bool throw_dead:
            If :data:`True`, raise exceptions, otherwise it is the caller's
            responsibility.

        :raises CallError:
            The serialized data contained CallError exception.
        :raises ChannelError:
            The `is_dead` field was set.
        """
        _vv and IOLOG.debug('%r.unpickle()', self)
        if throw_dead and self.is_dead:
            self._throw_dead()

        obj = self._unpickled
        if obj is Message._unpickled:
            fp = BytesIO(self.data)
            unpickler = _Unpickler(fp, **self.UNPICKLER_KWARGS)
            unpickler.find_global = self._find_global
            try:
                # Must occur off the broker thread.
                try:
                    obj = unpickler.load()
                except:
                    LOG.error('raw pickle was: %r', self.data)
                    raise
                self._unpickled = obj
            except (TypeError, ValueError):
                e = sys.exc_info()[1]
                raise StreamError('invalid message: %s', e)

        if throw:

def _receive_one(self, broker):
        if self._input_buf_len < Message.HEADER_LEN:
            return False

        msg = Message()
        msg.router = self._router
        (magic, msg.dst_id, msg.src_id, msg.auth_id,
         msg.handle, msg.reply_to, msg_len) = struct.unpack(
            Message.HEADER_FMT,
            self._input_buf[0][:Message.HEADER_LEN],
        )

        if magic != Message.HEADER_MAGIC:
            LOG.error(self.corrupt_msg, self.stream.name, self._input_buf[0][:2048])
            self.stream.on_disconnect(broker)
            return False

        if msg_len > self._router.max_message_size:
            LOG.error('Maximum message size exceeded (got %d, max %d)',
                      msg_len, self._router.max_message_size)
            self.stream.on_disconnect(broker)
            return False

        total_len = msg_len + Message.HEADER_LEN
        if self._input_buf_len < total_len: