code: def handle(self, buffer, request_id, mindsdb_env, session):
      query = OrderedDict()
      flags, pos = unpack(UINT, buffer)
  
      checksum_present = bool(
          flags & (1 << OP_MSG_FLAGS["checksumPresent"])
      )
      if checksum_present:
          msg_len = len(buffer) - 4
      else:
          msg_len = len(buffer)
  
      # sections
      while pos < msg_len:
          kind, pos = unpack(BYTE, buffer, pos)
          if kind == 0:
              # body
              section_size, _ = unpack(INT, buffer, pos)
              docs, pos = decode_documents(buffer, pos, section_size)
              query.update(docs[0])
          elif kind == 1:
              # Document
              section_size, pos = unpack(INT, buffer, pos)
              seq_id, pos = get_utf8_string(buffer, pos)
              docs_len = (
                  section_size - struct.calcsize(INT) - len(seq_id) - 1
              )
              docs, pos = decode_documents(buffer, pos, docs_len)
              query[seq_id] = docs
  
      remaining = len(buffer) - pos
      if checksum_present:
          if remaining != 4:
              raise Exception(
                  "should be checksum at the end of message"
              )
          # TODO read and check checksum
      elif remaining != 0:
          raise Exception("is bytes left after msg parsing")
  
      logger.debug(f"GET OpMSG={query}")
  
      responder = self.responders.find_match(query)
      assert responder is not None, "query cant be processed"
  
      request_args = {
          "request_id": request_id,
          "database": query["$db"],
      }
  
      documents = responder.handle(
          query, request_args, mindsdb_env, session
      )
  
      return documents
  
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 1 for calling the OpMsgResponder obj's underlying member method code with example usage: obj.handle(buffer, request_id, mindsdb_env, session) and returns: documents