code: def _auth_future_to_callback(callback, future):
      try:
          result = future.result()
      except AuthError as e:
          gen_log.warning(str(e))
          result = None
      callback(result)
  
imports: from __future__ import absolute_import, division, print_function
  import base64
  import binascii
  import functools
  import hashlib
  import hmac
  import time
  import uuid
  from tornado.concurrent import TracebackFuture, return_future, chain_future
  from tornado import gen
  from tornado import httpclient
  from tornado import escape
  from tornado.httputil import url_concat
  from tornado.log import gen_log
  from tornado.stack_context import ExceptionStackContext
  from tornado.util import unicode_type, ArgReplacer, PY3
label_desc: Use image node_id 1 for calling a global function with example usage: _auth_future_to_callback(callback, future) without return types