code: def _check_revoked(self, revoke_id, timestamp=None, peek=True):
          
          res = self.get(revoke_id, peek=True)
          if res is None:
              return False, False
  
          revoke_until, revoke_once = res
          if revoke_until is not None and timestamp is None:
              timestamp = self._get_timestamp()
  
          if revoke_once:
              # This task *was* revoked for one run, but now it should be
              # restored to normal execution (unless we are just peeking).
              return True, not peek
          elif revoke_until is not None and revoke_until <= timestamp:
              # Task is no longer revoked and can be restored.
              return False, not peek
          else:
              # Task is still revoked. Do not restore.
              return True, False
docs: Checks if a task is revoked, returns a 2-tuple indicating:
  
          1. Is task revoked?
          2. Should task be restored?