code: def to_bytes(self, response, request_id, is_error=False):
      if is_error:
          flags = struct.pack("<I", 2)
      else:
          flags = struct.pack("<I", 0)  # TODO
      payload_type = struct.pack("<b", 0)  # TODO
  
      codec_options = CodecOptions(type_registry=type_registry)
      payload_data = bson.BSON.encode(
          response, codec_options=codec_options
      )
      data = b"".join([flags, payload_type, payload_data])
  
      reply_id = 0  # TODO add seq here
      response_to = request_id
  
      header = struct.pack(
          "<iiii", 16 + len(data), reply_id, response_to, OP_MSG
      )
      return header + data
  
imports: import socketserver
  import socket
  import struct
  import bson
  import traceback
  from bson import codec_options
  from collections import OrderedDict
  from abc import abstractmethod
  from bson.codec_options import CodecOptions
  from bson.codec_options import TypeCodec
  from bson.codec_options import TypeRegistry
  import numpy
  import datetime
  import mindsdb.api.mongo.functions
  from mindsdb.api.mongo.classes import RespondersCollection, Session
  from mindsdb.interfaces.storage import db
  from mindsdb.interfaces.model.model_controller import ModelController
  from mindsdb.interfaces.database.integrations import integration_controller
  from mindsdb.interfaces.database.projects import ProjectController
  from mindsdb.interfaces.database.database import DatabaseController
  from mindsdb.utilities.context import context
  from mindsdb.utilities import log
label_desc: Use image node_id 2 for calling the OpMsgResponder obj's underlying member method code with example usage: obj.to_bytes(response, request_id, is_error) and returns: unknown