code: def OnStartup(self):
      
      # We read the transaction log and fail any requests that are in it. If there
      # is anything in the transaction log we assume its there because we crashed
      # last time and let the server know.
  
      last_request = self.transaction_log.Get()
      if last_request:
        status = rdf_flows.GrrStatus(
            status=rdf_flows.GrrStatus.ReturnedStatus.CLIENT_KILLED,
            error_message="Client killed during transaction")
        if self.nanny_controller:
          nanny_status = self.nanny_controller.GetNannyStatus()
          if nanny_status:
            status.nanny_status = nanny_status
  
        self.SendReply(
            status,
            request_id=last_request.request_id,
            response_id=1,
            session_id=last_request.session_id,
            message_type=rdf_flows.GrrMessage.Type.STATUS)
  
      self.transaction_log.Clear()
  
      # Inform the server that we started.
      action = admin.SendStartupInfo(grr_worker=self)
      action.Run(None, ttl=1)
docs: A handler that is called on client startup.