// ExecuteVtworkerCommand is part of the vtworkerdatapb.VtworkerServer interface
func (s *VtworkerServer) ExecuteVtworkerCommand(args *vtworkerdatapb.ExecuteVtworkerCommandRequest, stream vtworkerservicepb.Vtworker_ExecuteVtworkerCommandServer) (err error) {
	// Please note that this panic handler catches only panics occuring in the code below.
	// The actual execution of the vtworker command takes place in a new go routine
	// (started in Instance.setAndStartWorker()) which has its own panic handler.
	defer servenv.HandlePanic("vtworker", &err)

	// Stream everything back what the Wrangler is logging.
	logstream := logutil.NewCallbackLogger(func(e *logutilpb.Event) {
		// If the client disconnects, we will just fail
		// to send the log events, but won't interrupt
		// the command.
		stream.Send(&vtworkerdatapb.ExecuteVtworkerCommandResponse{
			Event: e,
		})
	})
	// Let the Wrangler also log everything to the console (and thereby
	// effectively to a logfile) to make sure that any information or errors
	// is preserved in the logs in case the RPC or vtworker crashes.
	logger := logutil.NewTeeLogger(logstream, logutil.NewConsoleLogger())

	// create the wrangler
	wr := s.wi.CreateWrangler(logger)

	// execute the command
	worker, done, err := s.wi.RunCommand(args.Args, wr, false /*runFromCli*/)
	if err == nil && worker != nil && done != nil {
		err = s.wi.WaitForCommand(worker, done)
	}

	return err
}

// ExecuteVtworkerCommand is part of the pb.VtworkerServer interface
func (s *VtworkerServer) ExecuteVtworkerCommand(args *pb.ExecuteVtworkerCommandRequest, stream pbs.Vtworker_ExecuteVtworkerCommandServer) (err error) {
	// Please note that this panic handler catches only panics occuring in the code below.
	// The actual execution of the vtworker command takes place in a new go routine
	// (started in Instance.setAndStartWorker()) which has its own panic handler.
	defer servenv.HandlePanic("vtworker", &err)

	// create a logger, send the result back to the caller
	logstream := logutil.NewChannelLogger(10)
	logger := logutil.NewTeeLogger(logstream, logutil.NewMemoryLogger())

	// send logs to the caller
	wg := sync.WaitGroup{}
	wg.Add(1)
	go func() {
		for e := range logstream {
			// Note we don't interrupt the loop here, as
			// we still need to flush and finish the
			// command, even if the channel to the client
			// has been broken. We'll just keep trying.
			stream.Send(&pb.ExecuteVtworkerCommandResponse{
				Event: &pbl.Event{
					Time: &pbl.Time{
						Seconds:     e.Time.Unix(),
						Nanoseconds: int32(e.Time.Nanosecond()),
					},
					Level: pbl.Level(e.Level),
					File:  e.File,
					Line:  int64(e.Line),
					Value: e.Value,
				},
			})
		}
		wg.Done()
	}()

	// create the wrangler
	wr := s.wi.CreateWrangler(logger)

	// execute the command
	if len(args.Args) >= 1 && args.Args[0] == "Reset" {
		err = s.wi.Reset()
	} else {
		// Make sure we use the global "err" variable and do not redeclare it in this scope.
		var worker worker.Worker
		var done chan struct{}
		worker, done, err = s.wi.RunCommand(args.Args, wr, false /*runFromCli*/)
		if err == nil {
			err = s.wi.WaitForCommand(worker, done)
		}
	}

	// close the log channel, and wait for them all to be sent
	close(logstream)
	wg.Wait()

	return err
}

// ExecuteVtworkerCommand is part of the vtworkerdatapb.VtworkerServer interface
func (s *VtworkerServer) ExecuteVtworkerCommand(args *vtworkerdatapb.ExecuteVtworkerCommandRequest, stream vtworkerservicepb.Vtworker_ExecuteVtworkerCommandServer) (err error) {
	// Please note that this panic handler catches only panics occuring in the code below.
	// The actual execution of the vtworker command takes place in a new go routine
	// (started in Instance.setAndStartWorker()) which has its own panic handler.
	defer servenv.HandlePanic("vtworker", &err)

	// Stream everything back what the Wrangler is logging.
	logstream := logutil.NewChannelLogger(10)
	// Let the Wrangler also log everything to the console (and thereby
	// effectively to a logfile) to make sure that any information or errors
	// is preserved in the logs in case the RPC or vtworker crashes.
	logger := logutil.NewTeeLogger(logstream, logutil.NewConsoleLogger())

	// send logs to the caller
	wg := sync.WaitGroup{}
	wg.Add(1)
	go func() {
		for e := range logstream {
			// Note we don't interrupt the loop here, as
			// we still need to flush and finish the
			// command, even if the channel to the client
			// has been broken. We'll just keep trying.
			stream.Send(&vtworkerdatapb.ExecuteVtworkerCommandResponse{
				Event: e,
			})
		}
		wg.Done()
	}()

	// create the wrangler
	wr := s.wi.CreateWrangler(logger)

	// execute the command
	worker, done, err := s.wi.RunCommand(args.Args, wr, false /*runFromCli*/)
	if err == nil && worker != nil && done != nil {
		err = s.wi.WaitForCommand(worker, done)
	}

	// close the log channel, and wait for them all to be sent
	close(logstream)
	wg.Wait()

	return err
}