code: func (app *App) RestoreFromFile(filename string, storeFunc func(*points.Points)) error {
  	var pointsCount int
  	startTime := time.Now()
  
  	logger := zapwriter.Logger("restore").With(zap.String("filename", filename))
  	logger.Info("restore started")
  
  	defer func() {
  		logger.Info("restore finished",
  			zap.Int("points", pointsCount),
  			zap.Duration("runtime", time.Since(startTime)),
  		)
  	}()
  
  	err := points.ReadFromFile(filename, func(p *points.Points) {
  		pointsCount += len(p.Data)
  		storeFunc(p)
  	})
  
  	return err
  }
docs: // RestoreFromFile read and parse data from single file