code: def close(self, code=3000, message='Go away!'):
          
          if self.state != SESSION_STATE.CLOSED:
              try:
                  self.conn.connectionLost()
              except Exception as e:
                  log.msg("Failed to call connectionLost(): %r." % e)
              finally:
                  self.state = SESSION_STATE.CLOSED
                  self.close_reason = (code, message)
  
              # Bump stats
              self.stats.sessionClosed(self.transport_name)
  
              # If we have active handler, notify that session was closed
              if self.handler is not None:
                  self.handler.session_closed()
docs: Close session or endpoint connection.
  
          @param code: Closing code
  
          @param message: Close message