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manage_offer.go
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manage_offer.go
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package txnbuild
import (
"github.com/stellar/go/amount"
"github.com/stellar/go/price"
"github.com/stellar/go/support/errors"
"github.com/stellar/go/xdr"
)
//CreateOfferOp returns a ManageSellOffer operation to create a new offer, by
// setting the OfferID to "0". The sourceAccount is optional, and if not provided,
// will be that of the surrounding transaction.
func CreateOfferOp(selling, buying Asset, amount, price string, sourceAccount ...Account) (ManageSellOffer, error) {
if len(sourceAccount) > 1 {
return ManageSellOffer{}, errors.New("offer can't have multiple source accounts")
}
offer := ManageSellOffer{
Selling: selling,
Buying: buying,
Amount: amount,
Price: price,
OfferID: 0,
}
if len(sourceAccount) == 1 {
offer.SourceAccount = sourceAccount[0]
}
return offer, nil
}
// UpdateOfferOp returns a ManageSellOffer operation to update an offer.
// The sourceAccount is optional, and if not provided, will be that of
// the surrounding transaction.
func UpdateOfferOp(selling, buying Asset, amount, price string, offerID int64, sourceAccount ...Account) (ManageSellOffer, error) {
if len(sourceAccount) > 1 {
return ManageSellOffer{}, errors.New("offer can't have multiple source accounts")
}
offer := ManageSellOffer{
Selling: selling,
Buying: buying,
Amount: amount,
Price: price,
OfferID: offerID,
}
if len(sourceAccount) == 1 {
offer.SourceAccount = sourceAccount[0]
}
return offer, nil
}
//DeleteOfferOp returns a ManageSellOffer operation to delete an offer, by
// setting the Amount to "0". The sourceAccount is optional, and if not provided,
// will be that of the surrounding transaction.
func DeleteOfferOp(offerID int64, sourceAccount ...Account) (ManageSellOffer, error) {
// It turns out Stellar core doesn't care about any of these fields except the amount.
// However, Horizon will reject ManageSellOffer if it is missing fields.
// Horizon will also reject if Buying == Selling.
// Therefore unfortunately we have to make up some dummy values here.
if len(sourceAccount) > 1 {
return ManageSellOffer{}, errors.New("offer can't have multiple source accounts")
}
offer := ManageSellOffer{
Selling: NativeAsset{},
Buying: CreditAsset{Code: "FAKE", Issuer: "GBAQPADEYSKYMYXTMASBUIS5JI3LMOAWSTM2CHGDBJ3QDDPNCSO3DVAA"},
Amount: "0",
Price: "1",
OfferID: offerID,
}
if len(sourceAccount) == 1 {
offer.SourceAccount = sourceAccount[0]
}
return offer, nil
}
// ManageSellOffer represents the Stellar manage offer operation. See
// https://www.stellar.org/developers/guides/concepts/list-of-operations.html
type ManageSellOffer struct {
Selling Asset
Buying Asset
Amount string
Price string
OfferID int64
SourceAccount Account
}
// BuildXDR for ManageSellOffer returns a fully configured XDR Operation.
func (mo *ManageSellOffer) BuildXDR() (xdr.Operation, error) {
xdrSelling, err := mo.Selling.ToXDR()
if err != nil {
return xdr.Operation{}, errors.Wrap(err, "failed to set XDR 'Selling' field")
}
xdrBuying, err := mo.Buying.ToXDR()
if err != nil {
return xdr.Operation{}, errors.Wrap(err, "failed to set XDR 'Buying' field")
}
xdrAmount, err := amount.Parse(mo.Amount)
if err != nil {
return xdr.Operation{}, errors.Wrap(err, "failed to parse 'Amount'")
}
xdrPrice, err := price.Parse(mo.Price)
if err != nil {
return xdr.Operation{}, errors.Wrap(err, "failed to parse 'Price'")
}
opType := xdr.OperationTypeManageSellOffer
xdrOp := xdr.ManageSellOfferOp{
Selling: xdrSelling,
Buying: xdrBuying,
Amount: xdrAmount,
Price: xdrPrice,
OfferId: xdr.Int64(mo.OfferID),
}
body, err := xdr.NewOperationBody(opType, xdrOp)
if err != nil {
return xdr.Operation{}, errors.Wrap(err, "failed to build XDR OperationBody")
}
op := xdr.Operation{Body: body}
SetOpSourceAccount(&op, mo.SourceAccount)
return op, nil
}