How to use the rpyc.core.consts function in rpyc

def _netref_factory(self, oid, clsname, modname):
        typeinfo = (clsname, modname)
        if typeinfo in self._netref_classes_cache:
            cls = self._netref_classes_cache[typeinfo]
        elif typeinfo in netref.builtin_classes_cache:
            cls = netref.builtin_classes_cache[typeinfo]
        else:
            info = self.sync_request(consts.HANDLE_INSPECT, oid)
            cls = netref.class_factory(clsname, modname, info)
            self._netref_classes_cache[typeinfo] = cls
        return cls(weakref.ref(self), oid)

def __del__(self):
        try:
            asyncreq(self, consts.HANDLE_DEL, self.____refcount__)
        except Exception:
            # raised in a destructor, most likely on program termination,
            # when the connection might have already been closed.
            # it's safe to ignore all exceptions here
            pass

def _request_handlers(cls):  # request handlers
        return {
            consts.HANDLE_PING: cls._handle_ping,
            consts.HANDLE_CLOSE: cls._handle_close,
            consts.HANDLE_GETROOT: cls._handle_getroot,
            consts.HANDLE_GETATTR: cls._handle_getattr,
            consts.HANDLE_DELATTR: cls._handle_delattr,
            consts.HANDLE_SETATTR: cls._handle_setattr,
            consts.HANDLE_CALL: cls._handle_call,
            consts.HANDLE_CALLATTR: cls._handle_callattr,
            consts.HANDLE_REPR: cls._handle_repr,
            consts.HANDLE_STR: cls._handle_str,
            consts.HANDLE_CMP: cls._handle_cmp,
            consts.HANDLE_HASH: cls._handle_hash,
            consts.HANDLE_INSTANCECHECK: cls._handle_instancecheck,
            consts.HANDLE_DIR: cls._handle_dir,
            consts.HANDLE_PICKLE: cls._handle_pickle,
            consts.HANDLE_DEL: cls._handle_del,
            consts.HANDLE_INSPECT: cls._handle_inspect,
            consts.HANDLE_BUFFITER: cls._handle_buffiter,
            consts.HANDLE_OLDSLICING: cls._handle_oldslicing,
            consts.HANDLE_CTXEXIT: cls._handle_ctxexit,
        }

def close(self, _catchall = True):
        """closes the connection, releasing all held resources"""
        if self._closed:
            return
        self._closed = True
        try:
            self._async_request(consts.HANDLE_CLOSE)
        except EOFError:
            pass
        except Exception:
            if not _catchall:
                raise
        finally:
            self._cleanup(_anyway = True)

def _dispatch(self, data):
        msg, seq, args = brine.load(data)
        if msg == consts.MSG_REQUEST:
            self._dispatch_request(seq, args)
        elif msg == consts.MSG_REPLY:
            self._dispatch_reply(seq, args)
        elif msg == consts.MSG_EXCEPTION:
            self._dispatch_exception(seq, args)
        else:
            raise ValueError("invalid message type: %r" % (msg,))

def _unbox(self, package):
        """recreate a local object representation of the remote object: if the
        object is passed by value, just return it; if the object is passed by
        reference, create a netref to it"""
        label, value = package
        if label == consts.LABEL_VALUE:
            return value
        if label == consts.LABEL_TUPLE:
            return tuple(self._unbox(item) for item in value)
        if label == consts.LABEL_LOCAL_REF:
            return self._local_objects[value]
        if label == consts.LABEL_REMOTE_REF:
            oid, clsname, modname = value
            if oid in self._proxy_cache:
                return self._proxy_cache[oid]
            proxy = self._netref_factory(oid, clsname, modname)
            self._proxy_cache[oid] = proxy
            return proxy
        raise ValueError("invalid label %r" % (label,))

def _request_handlers(cls):  # request handlers
        return {
            consts.HANDLE_PING: cls._handle_ping,
            consts.HANDLE_CLOSE: cls._handle_close,
            consts.HANDLE_GETROOT: cls._handle_getroot,
            consts.HANDLE_GETATTR: cls._handle_getattr,
            consts.HANDLE_DELATTR: cls._handle_delattr,
            consts.HANDLE_SETATTR: cls._handle_setattr,
            consts.HANDLE_CALL: cls._handle_call,
            consts.HANDLE_CALLATTR: cls._handle_callattr,
            consts.HANDLE_REPR: cls._handle_repr,
            consts.HANDLE_STR: cls._handle_str,
            consts.HANDLE_CMP: cls._handle_cmp,
            consts.HANDLE_HASH: cls._handle_hash,
            consts.HANDLE_INSTANCECHECK: cls._handle_instancecheck,
            consts.HANDLE_DIR: cls._handle_dir,
            consts.HANDLE_PICKLE: cls._handle_pickle,
            consts.HANDLE_DEL: cls._handle_del,
            consts.HANDLE_INSPECT: cls._handle_inspect,
            consts.HANDLE_BUFFITER: cls._handle_buffiter,
            consts.HANDLE_OLDSLICING: cls._handle_oldslicing,
            consts.HANDLE_CTXEXIT: cls._handle_ctxexit,
        }

def _dispatch(self, data):
        msg, seq, args = brine.load(data)
        if msg == consts.MSG_REQUEST:
            self._dispatch_request(seq, args)
        elif msg == consts.MSG_REPLY:
            self._dispatch_reply(seq, args)
        elif msg == consts.MSG_EXCEPTION:
            self._dispatch_exception(seq, args)
        else:
            raise ValueError("invalid message type: %r" % (msg,))

def _send_exception(self, seq, exctype, excval, exctb):
        exc = vinegar.dump(exctype, excval, exctb,
            include_local_traceback = self._config["include_local_traceback"])
        self._send(consts.MSG_EXCEPTION, seq, exc)

def close(self, _catchall=True):
        with self._close_lock:
            if self._closed:
                return

            self._closed = True

        if __debug__:
            logger.debug('Connection(%s) - close - start (at: %s:%s %s(%s))',
                self, *traceback.extract_stack()[-2])

        try:
            self.buf_in.wake()

            self._async_request(consts.HANDLE_CLOSE)
        except EOFError, e:
            logger.info(
                'Connection(%s) - close - notification failed '
                'because of EOF (%s)', self, e)

        except Exception:
            if not _catchall:
                raise
        finally:
            try:
                self._cleanup(_anyway=True)
            except Exception, e:
                if __debug__:
                    logger.debug('Cleanup exception(%s): %s', self, e)

                pass