docstr: Opens a websocket and assigns a random UUID that is stored in the class-level
  `subs` variable.
docstr_tok: ["Opens","a","websocket","and","assigns","a","random","UUID","that","is","stored","in","the","class-level","`","subs","`","variable","."]
code: def open(self):
      """
      Opens a websocket and assigns a random UUID that is stored in the class-level
      `subs` variable.
      """
      if self.sid not in self.subs.values():
          self.subs[self.sid] = self
          self.set_nodelay(True)
          logging.info(
              f"Opened new socket from ip: {self.request.remote_ip}"
          )
          logging.info(f"Current subscribers: {self.subs}")
  
file_path: ParlAI/parlai/chat_service/services/websocket/sockets.py
imports: from typing import Dict, TypeVar
  from tornado.websocket import WebSocketHandler
  import uuid
  import logging
  import json
label_desc: Use image node_id 2 for calling the MessageSocketHandler obj's underlying member method code with example usage: obj.open() without return types