// ExampleLowLevelTransaction creates and signs a simple transaction, and then
// encodes it into a hex string capable of being submitted to stellar-core.
//
// It uses the low-level xdr facilities to create the transaction.
func ExampleLowLevelTransaction() {
spub, spriv, err := GenerateKeyFromSeed("s3Fy8h5LEcYVE8aofthKWHeJpygbntw5HgcekFw93K6XqTW4gEx")
if err != nil {
log.Fatal(err)
}
dpub, _, err := GenerateKeyFromSeed("sfkPCKA6XgaeHZH3NE57i3QrjVcw61c1noWQCgnHa6KJP2BrbXD")
if err != nil {
log.Fatal(err)
}
op := xdr.PaymentOp{
Destination: dpub.KeyData(),
Currency: xdr.NewCurrencyCurrencyTypeNative(),
Amount: 50 * 10000000,
}
tx := xdr.Transaction{
SourceAccount: spub.KeyData(),
Fee: 10,
SeqNum: xdr.SequenceNumber(1),
Memo: xdr.NewMemoMemoNone(),
Operations: []xdr.Operation{
{Body: xdr.NewOperationBodyPayment(op)},
},
}
var txBytes bytes.Buffer
_, err = xdr.Marshal(&txBytes, tx)
if err != nil {
log.Fatal(err)
}
txHash := Hash(txBytes.Bytes())
signature := spriv.Sign(txHash[:])
ds := xdr.DecoratedSignature{
Hint: spriv.Hint(),
Signature: xdr.Uint512(signature),
}
txe := xdr.TransactionEnvelope{
Tx: tx,
Signatures: []xdr.DecoratedSignature{ds},
}
var txeBytes bytes.Buffer
_, err = xdr.Marshal(&txeBytes, txe)
if err != nil {
log.Fatal(err)
}
txeHex := hex.EncodeToString(txeBytes.Bytes())
fmt.Printf("tx hex: %s", txeHex)
// Output: tx hex: 3658fe7598d20c7a6de3297f84bc52bd2a1ec8c0f1f6c5b41cc1c7571b4331f00000000a000000000000000100000000000000000000000100000000000000012d24692ed08bbf679ba199448870d2191e876fecd92fdd9f6d274da4e6de134100000000000000001dcd650000000001dd302d0c0cee527cf02f6a0aec6916966298712914c63e3c57de74a6e27c29ea234a555fcc36533417afe4e1147815a42529fbca3429bc7caf0a06dc6b383ca6e9d4d80f
}
func TestPaymentMutators(t *testing.T) {
Convey("TransactionBuilder Mutators:", t, func() {
b := PaymentBuilder{}
Convey("Destination sets the destination of a payment", func() {
address := "gLtaC2yiJs3r8YE2bTiVfFs9Mi5KdRoLNLUA45HYVy4iNd7S9p"
aid, _ := stellarbase.AddressToAccountId(address)
b.Mutate(Destination{address})
So(b.P.Destination, ShouldEqual, aid)
So(b.Err, ShouldBeNil)
})
Convey("Destination sets an error for invalid addresses", func() {
address := "foo"
b.Mutate(Destination{address})
So(b.Err, ShouldNotBeNil)
})
Convey("SourceAccount sets the transaction's SourceAccount correctly", func() {
address := "gLtaC2yiJs3r8YE2bTiVfFs9Mi5KdRoLNLUA45HYVy4iNd7S9p"
aid, _ := stellarbase.AddressToAccountId(address)
b.Mutate(SourceAccount{address})
So(b.O.SourceAccount, ShouldNotBeNil)
So(*b.O.SourceAccount, ShouldEqual, aid)
So(b.Err, ShouldBeNil)
})
Convey("SourceAccount sets an error for invalid addresses", func() {
address := "foo"
b.Mutate(SourceAccount{address})
So(b.Err, ShouldNotBeNil)
})
Convey("NativeAmount sets amount and currency correctly", func() {
b.Mutate(NativeAmount{101})
So(b.Err, ShouldBeNil)
So(b.P.Currency, ShouldResemble, xdr.NewCurrencyCurrencyTypeNative())
So(b.P.Amount, ShouldEqual, 101)
})
})
}
// MutatePayment for NativeAmount sets the PaymentOp's currency field to
// native and sets its amount to the provided integer
func (m NativeAmount) MutatePayment(o *xdr.PaymentOp) error {
o.Currency = xdr.NewCurrencyCurrencyTypeNative()
o.Amount = xdr.Int64(m.Amount)
return nil
}