The first simple activities to run in a Cadence workflow

cadence-first-activities.go

// activityGreetings is used to say Hello to a Customer and change their LastVisit and TimesVisisted
// The returned value will be a Customer struct filled with this information
func activityGreetings(ctx context.Context, visitor customer.Customer) (customer.Customer, error) {
	logger := activity.GetLogger(ctx)
	logger.Info("Greetings activity started")
	logger.Info("New Visitor", zap.String("customer", visitor.Name), zap.Int("visitorCount", visitorCount))
	visitorCount++

	oldCustomerInfo, _ := customer.Database.Get(visitor.Name)

	visitor.LastVisit = time.Now()
	visitor.TimesVisited = oldCustomerInfo.TimesVisited + 1
	return visitor, nil
}

// activityStoreCustomer is used to store the Customer in the configured Customer Storage.
func activityStoreCustomer(ctx context.Context, visitor customer.Customer) error {
	logger := activity.GetLogger(ctx)
	logger.Info("Store Customer activity started")
	logger.Info("Updating Customer", zap.String("customer", visitor.Name), zap.Time("lastVisit", visitor.LastVisit),
		zap.Int("timesVisited", visitor.TimesVisited))

	// Store Customer in Database (Memory Cache during this Example)
	err := customer.Database.Update(visitor)
	if err != nil {
		return err
	}
	return nil
}