ui/account.go
func (h *Handler) TransferTokens(
	tkn, account, destination string, amount, gasPrice uint64) error {
	logger := h.logger.Add("method", "TransferTokens", "destination",
		destination, "amount", amount, "gasPrice", gasPrice)

	if !h.token.Check(tkn) {
		logger.Warn("access denied")
		return ErrAccessDenied
	}

	if amount == 0 {
		logger.Error(ErrTokenAmountTooSmall.Error())
		return ErrTokenAmountTooSmall
	}

	if destination != data.ContractPSC && destination != data.ContractPTC {
		logger.Error(ErrBadDestination.Error())
		return ErrBadDestination
	}

	err := h.findByPrimaryKey(
		logger, ErrAccountNotFound, &data.Account{}, account)
	if err != nil {
		return err
	}

	jobType := data.JobPreAccountAddBalanceApprove
	if destination == data.ContractPTC {
		jobType = data.JobPreAccountReturnBalance
	}

	jobData := &data.JobBalanceData{
		Amount:   amount,
		GasPrice: gasPrice,
	}

	err = job.AddWithData(h.queue, nil, jobType,
		data.JobAccount, account, data.JobUser, jobData)
	if err != nil {
		logger.Error(err.Error())
		return ErrInternal
	}

	return nil
}
func (h *Handler) TransferTokens(
	tkn, account, destination string, amount, gasPrice uint64) error {
	logger := h.logger.Add("method", "TransferTokens", "destination",
		destination, "amount", amount, "gasPrice", gasPrice)

	if !h.token.Check(tkn) {
		logger.Warn("access denied")
		return ErrAccessDenied
	}

	if amount == 0 {
		logger.Error(ErrTokenAmountTooSmall.Error())
		return ErrTokenAmountTooSmall
	}

	if destination != data.ContractPSC && destination != data.ContractPTC {
		logger.Error(ErrBadDestination.Error())
		return ErrBadDestination
	}

	err := h.findByPrimaryKey(
		logger, ErrAccountNotFound, &data.Account{}, account)
	if err != nil {
		return err
	}

	jobType := data.JobPreAccountAddBalanceApprove
	if destination == data.ContractPTC {
		jobType = data.JobPreAccountReturnBalance
	}

	jobData := &data.JobBalanceData{
		Amount:   amount,
		GasPrice: gasPrice,
	}

	err = job.AddWithData(h.queue, nil, jobType,
		data.JobAccount, account, data.JobUser, jobData)
	if err != nil {
		logger.Error(err.Error())
		return ErrInternal
	}

	return nil
}
// TransferTokens initiates JobPreAccountAddBalanceApprove
// or JobPreAccountReturnBalance job depending on the direction of the transfer.