code: def remove_subscriber(self, message):
          
          logger.debug("Remove Subcriber")
          host, port = message.destination
          key_token = hash(str(host) + str(port) + str(message.token))
          try:
              self._relations[key_token].transaction.completed = True
              del self._relations[key_token]
          except KeyError:
              logger.warning("No Subscriber")
docs: Remove a subscriber based on token.
  
          :param message: the message