Method Transfer

11_app_dev/chaincode_example03.go:179–211

Transfer moves currency between companies.

(ctx contractapi.TransactionContextInterface, fromCompanyID string, toCompanyID string, amount string)

// Transfer moves currency between companies.
func (s *SmartContract) Transfer(ctx contractapi.TransactionContextInterface, fromCompanyID string, toCompanyID string, amount string) (*Transaction, error) {
	fromID, err := strconv.Atoi(fromCompanyID)
	if err != nil {
		return nil, fmt.Errorf("from company id must be an integer: %w", err)
	}
	toID, value, err := parseIDAndAmount(toCompanyID, amount)
	if err != nil {
		return nil, err
	}

	from, err := readCompany(ctx, fromID)
	if err != nil {
		return nil, err
	}
	if from.Number < value {
		return nil, fmt.Errorf("company %d balance is insufficient", fromID)
	}
	to, err := readCompany(ctx, toID)
	if err != nil {
		return nil, err
	}

	from.Number -= value
	to.Number += value

	if err := putJSON(ctx, companyKey(fromID), from); err != nil {
		return nil, err
	}
	if err := putJSON(ctx, companyKey(toID), to); err != nil {
		return nil, err
	}
	return recordTransaction(ctx, 2, fromID, 2, toID, value)
}

func (s *SmartContract) GetCenterBank(ctx contractapi.TransactionContextInterface) (*CenterBank, error) {
	return readCenterBank(ctx)