proc/worker/account.go
func (w *Worker) PreAccountReturnBalance(job *data.Job) error {
	logger := w.logger.Add("method", "PreAccountReturnBalance", "job", job)
	acc, err := w.relatedAccount(logger, job, data.JobPreAccountReturnBalance)
	if err != nil {
		return err
	}

	key, err := w.key(logger, acc.PrivateKey)
	if err != nil {
		return err
	}

	jobData, err := w.balanceData(logger, job)
	if err != nil {
		return err
	}

	auth := bind.NewKeyedTransactor(key)

	amount, err := w.ethBack.PSCBalanceOf(&bind.CallOpts{}, auth.From)
	if err != nil {
		logger.Error(err.Error())
		return ErrPSCReturnBalance
	}

	if amount < uint64(jobData.Amount) {
		return ErrInsufficientPSCBalance
	}

	ethAmount, err := w.ethBalance(logger, auth.From)
	if err != nil {
		return err
	}

	wantedEthBalance := w.gasConf.PSC.ReturnBalanceERC20 * jobData.GasPrice

	if wantedEthBalance > ethAmount.Uint64() {
		return ErrInsufficientEthBalance
	}

	auth.GasLimit = w.gasConf.PSC.ReturnBalanceERC20
	auth.GasPrice = new(big.Int).SetUint64(jobData.GasPrice)

	tx, err := w.ethBack.PSCReturnBalanceERC20(auth, uint64(jobData.Amount))
	if err != nil {
		logger.Add("GasLimit", auth.GasLimit,
			"GasPrice", auth.GasPrice).Error(err.Error())
		return ErrPSCRetrieveBalance
	}

	return w.saveEthTX(logger, job, tx, "PSCReturnBalanceERC20", job.RelatedType,
		job.RelatedID, data.HexFromBytes(w.pscAddr.Bytes()), acc.EthAddr)
}
func (w *Worker) PreAccountReturnBalance(job *data.Job) error {
	logger := w.logger.Add("method", "PreAccountReturnBalance", "job", job)
	acc, err := w.relatedAccount(logger, job, data.JobPreAccountReturnBalance)
	if err != nil {
		return err
	}

	key, err := w.key(logger, acc.PrivateKey)
	if err != nil {
		return err
	}

	jobData, err := w.balanceData(logger, job)
	if err != nil {
		return err
	}

	auth := bind.NewKeyedTransactor(key)

	amount, err := w.ethBack.PSCBalanceOf(&bind.CallOpts{}, auth.From)
	if err != nil {
		logger.Error(err.Error())
		return ErrPSCReturnBalance
	}

	if amount < uint64(jobData.Amount) {
		return ErrInsufficientPSCBalance
	}

	ethAmount, err := w.ethBalance(logger, auth.From)
	if err != nil {
		return err
	}

	wantedEthBalance := w.gasConf.PSC.ReturnBalanceERC20 * jobData.GasPrice

	if wantedEthBalance > ethAmount.Uint64() {
		return ErrInsufficientEthBalance
	}

	auth.GasLimit = w.gasConf.PSC.ReturnBalanceERC20
	auth.GasPrice = new(big.Int).SetUint64(jobData.GasPrice)

	tx, err := w.ethBack.PSCReturnBalanceERC20(auth, uint64(jobData.Amount))
	if err != nil {
		logger.Add("GasLimit", auth.GasLimit,
			"GasPrice", auth.GasPrice).Error(err.Error())
		return ErrPSCRetrieveBalance
	}

	return w.saveEthTX(logger, job, tx, "PSCReturnBalanceERC20", job.RelatedType,
		job.RelatedID, data.HexFromBytes(w.pscAddr.Bytes()), acc.EthAddr)
}
// PreAccountReturnBalance returns from psc to ptc.