proc/worker/agent.go
func (w *Worker) AgentPreOfferingDelete(job *data.Job) error {
	logger := w.logger.Add("method", "AgentPreOfferingDelete", "job", job)

	offering, err := w.relatedOffering(logger,
		job, data.JobAgentPreOfferingDelete)
	if err != nil {
		return err
	}

	if offering.Status != data.OfferRegistered &&
		offering.Status != data.OfferPoppedUp {
		return ErrOfferNotRegistered
	}

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

	key, err := w.accountKey(logger, offering.Agent)
	if err != nil {
		return err
	}

	offeringHash, err := data.HexToHash(offering.Hash)
	if err != nil {
		logger.Error(err.Error())
		return err
	}

	err = w.checkInPeriod(logger, offeringHash, data.SettingsPeriodRemove,
		ErrOfferingDeletePeriodIsNotOver)
	if err != nil {
		return err
	}

	auth := bind.NewKeyedTransactor(key)
	auth.GasLimit = w.gasConf.PSC.RemoveServiceOffering
	auth.GasPrice = new(big.Int).SetUint64(jobDate.GasPrice)

	tx, err := w.ethBack.PSCRemoveServiceOffering(auth, offeringHash)
	if err != nil {
		logger.Add("GasLimit", auth.GasLimit,
			"GasPrice", auth.GasPrice).Error(err.Error())
		return ErrPSCRemoveOffering
	}

	offering.Status = data.OfferRemoving
	if err := w.saveRecord(logger, w.db.Querier,
		offering); err != nil {
		return err
	}

	return w.saveEthTX(logger, job, tx, "RemoveServiceOffering",
		job.RelatedType, job.RelatedID, offering.Agent,
		data.HexFromBytes(w.pscAddr.Bytes()))
}
func (w *Worker) AgentPreOfferingDelete(job *data.Job) error {
	logger := w.logger.Add("method", "AgentPreOfferingDelete", "job", job)

	offering, err := w.relatedOffering(logger,
		job, data.JobAgentPreOfferingDelete)
	if err != nil {
		return err
	}

	if offering.Status != data.OfferRegistered &&
		offering.Status != data.OfferPoppedUp {
		return ErrOfferNotRegistered
	}

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

	key, err := w.accountKey(logger, offering.Agent)
	if err != nil {
		return err
	}

	offeringHash, err := data.HexToHash(offering.Hash)
	if err != nil {
		logger.Error(err.Error())
		return err
	}

	err = w.checkInPeriod(logger, offeringHash, data.SettingsPeriodRemove,
		ErrOfferingDeletePeriodIsNotOver)
	if err != nil {
		return err
	}

	auth := bind.NewKeyedTransactor(key)
	auth.GasLimit = w.gasConf.PSC.RemoveServiceOffering
	auth.GasPrice = new(big.Int).SetUint64(jobDate.GasPrice)

	tx, err := w.ethBack.PSCRemoveServiceOffering(auth, offeringHash)
	if err != nil {
		logger.Add("GasLimit", auth.GasLimit,
			"GasPrice", auth.GasPrice).Error(err.Error())
		return ErrPSCRemoveOffering
	}

	offering.Status = data.OfferRemoving
	if err := w.saveRecord(logger, w.db.Querier,
		offering); err != nil {
		return err
	}

	return w.saveEthTX(logger, job, tx, "RemoveServiceOffering",
		job.RelatedType, job.RelatedID, offering.Agent,
		data.HexFromBytes(w.pscAddr.Bytes()))
}
// AgentPreOfferingDelete calls psc remove an offering.