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change_trust.go
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change_trust.go
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package txnbuild
import (
"math"
"github.com/AnneNamuli/go-stellar/amount"
"github.com/AnneNamuli/go-stellar/support/errors"
"github.com/AnneNamuli/go-stellar/xdr"
)
// ChangeTrust represents the Stellar change trust operation. See
// https://www.stellar.org/developers/guides/concepts/list-of-operations.html.
// If Limit is omitted, it defaults to txnbuild.MaxTrustlineLimit.
type ChangeTrust struct {
Line Asset
Limit string
SourceAccount Account
}
// MaxTrustlineLimit represents the maximum value that can be set as a trustline limit.
var MaxTrustlineLimit = amount.StringFromInt64(math.MaxInt64)
// RemoveTrustlineOp returns a ChangeTrust operation to remove the trustline of the described asset,
// by setting the limit to "0".
func RemoveTrustlineOp(issuedAsset Asset) ChangeTrust {
return ChangeTrust{
Line: issuedAsset,
Limit: "0",
}
}
// BuildXDR for ChangeTrust returns a fully configured XDR Operation.
func (ct *ChangeTrust) BuildXDR() (xdr.Operation, error) {
if ct.Line.IsNative() {
return xdr.Operation{}, errors.New("trustline cannot be extended to a native (XLM) asset")
}
xdrLine, err := ct.Line.ToXDR()
if err != nil {
return xdr.Operation{}, errors.Wrap(err, "can't convert trustline asset to XDR")
}
if ct.Limit == "" {
ct.Limit = MaxTrustlineLimit
}
xdrLimit, err := amount.Parse(ct.Limit)
if err != nil {
return xdr.Operation{}, errors.Wrap(err, "failed to parse limit amount")
}
opType := xdr.OperationTypeChangeTrust
xdrOp := xdr.ChangeTrustOp{
Line: xdrLine,
Limit: xdrLimit,
}
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, ct.SourceAccount)
return op, nil
}
// FromXDR for ChangeTrust initialises the txnbuild struct from the corresponding xdr Operation.
func (ct *ChangeTrust) FromXDR(xdrOp xdr.Operation) error {
result, ok := xdrOp.Body.GetChangeTrustOp()
if !ok {
return errors.New("error parsing change_trust operation from xdr")
}
ct.SourceAccount = accountFromXDR(xdrOp.SourceAccount)
ct.Limit = amount.String(result.Limit)
asset, err := assetFromXDR(result.Line)
if err != nil {
return errors.Wrap(err, "error parsing asset in change_trust operation")
}
ct.Line = asset
return nil
}
// Validate for ChangeTrust validates the required struct fields. It returns an error if any of the fields are
// invalid. Otherwise, it returns nil.
func (ct *ChangeTrust) Validate() error {
// only validate limit if it has a value. Empty limit is set to the max trustline limit.
if ct.Limit != "" {
err := validateAmount(ct.Limit)
if err != nil {
return NewValidationError("Limit", err.Error())
}
}
err := validateChangeTrustAsset(ct.Line)
if err != nil {
return NewValidationError("Line", err.Error())
}
return nil
}
// GetSourceAccount returns the source account of the operation, or nil if not
// set.
func (ct *ChangeTrust) GetSourceAccount() Account {
return ct.SourceAccount
}