class_docstr: A class for handling connections and interactions with the Google Calendar API.
docstr: Set up any connections required by the handler
  Should return output of check_connection() method after attempting
  connection. Should switch self.is_connected.
  Returns:
      HandlerStatusResponse
docstr_tok: ["Set","up","any","connections","required","by","the","handler","Should","return","output","of","check_connection","(",")","method","after","attempting","connection",".","Should","switch","self.is_connected",".","Returns",":","HandlerStatusResponse"]
code: def connect(self):
      """
      Set up any connections required by the handler
      Should return output of check_connection() method after attempting
      connection. Should switch self.is_connected.
      Returns:
          HandlerStatusResponse
      """
      if self.is_connected is True:
          return self.service
  
      secret_file = self.credentials_file
  
      curr_dir = self.handler_storage.folder_get("config")
  
      creds_file = None
      try:
          creds_file = os.path.join(curr_dir, "secret.json")
      except Exception:
          pass
  
      creds = None
      if os.path.isfile(creds_file):
          creds = Credentials.from_authorized_user_file(
              creds_file, self.scopes
          )
  
      if not creds or not creds.valid:
          if creds and creds.expired and creds.refresh_token:
              creds.refresh(Request())
  
              save_creds_to_file(creds, creds_file)
              self.handler_storage.folder_sync("config")
  
          else:
              creds = google_auth_flow(
                  secret_file,
                  self.scopes,
                  self.connection_data.get("code"),
              )
  
              save_creds_to_file(creds, creds_file)
              self.handler_storage.folder_sync("config")
  
      self.service = build("calendar", "v3", credentials=creds)
      return self.service
  
imports: import os
  from collections import OrderedDict
  import pandas
  from google.auth.transport.requests import Request
  from google.oauth2.credentials import Credentials
  from googleapiclient.discovery import build
  from mindsdb.api.executor.data_types.response_type import RESPONSE_TYPE
  from mindsdb.integrations.libs.const import HANDLER_CONNECTION_ARG_TYPE
  from mindsdb.integrations.libs.api_handler import APIHandler, FuncParser
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse
  from mindsdb.utilities import log
  from mindsdb.integrations.handlers.gmail_handler.utils import AuthException, google_auth_flow, save_creds_to_file
  from .google_calendar_tables import GoogleCalendarEventsTable
label_desc: Use image node_id 2 for calling the GoogleCalendarHandler obj's underlying member method code with example usage: obj.connect() and returns: self, self