lnd.xprv/input/size_test.go

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package input_test
import (
"testing"
"github.com/btcsuite/btcd/blockchain"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/input"
)
// TestTxWeightEstimator tests that transaction weight estimates are calculated
// correctly by comparing against an actual (though invalid) transaction
// matching the template.
func TestTxWeightEstimator(t *testing.T) {
netParams := &chaincfg.MainNetParams
p2pkhAddr, err := btcutil.NewAddressPubKeyHash(
make([]byte, 20), netParams)
if err != nil {
t.Fatalf("Failed to generate address: %v", err)
}
p2pkhScript, err := txscript.PayToAddrScript(p2pkhAddr)
if err != nil {
t.Fatalf("Failed to generate scriptPubKey: %v", err)
}
p2wkhAddr, err := btcutil.NewAddressWitnessPubKeyHash(
make([]byte, 20), netParams)
if err != nil {
t.Fatalf("Failed to generate address: %v", err)
}
p2wkhScript, err := txscript.PayToAddrScript(p2wkhAddr)
if err != nil {
t.Fatalf("Failed to generate scriptPubKey: %v", err)
}
p2wshAddr, err := btcutil.NewAddressWitnessScriptHash(
make([]byte, 32), netParams)
if err != nil {
t.Fatalf("Failed to generate address: %v", err)
}
p2wshScript, err := txscript.PayToAddrScript(p2wshAddr)
if err != nil {
t.Fatalf("Failed to generate scriptPubKey: %v", err)
}
p2shAddr, err := btcutil.NewAddressScriptHash([]byte{0}, netParams)
if err != nil {
t.Fatalf("Failed to generate address: %v", err)
}
p2shScript, err := txscript.PayToAddrScript(p2shAddr)
if err != nil {
t.Fatalf("Failed to generate scriptPubKey: %v", err)
}
testCases := []struct {
numP2PKHInputs int
numP2WKHInputs int
numP2WSHInputs int
numNestedP2WKHInputs int
numNestedP2WSHInputs int
numP2PKHOutputs int
numP2WKHOutputs int
numP2WSHOutputs int
numP2SHOutputs int
}{
// Assert base txn size.
{},
// Assert single input/output sizes.
{
numP2PKHInputs: 1,
},
{
numP2WKHInputs: 1,
},
{
numP2WSHInputs: 1,
},
{
numNestedP2WKHInputs: 1,
},
{
numNestedP2WSHInputs: 1,
},
{
numP2WKHOutputs: 1,
},
{
numP2PKHOutputs: 1,
},
{
numP2WSHOutputs: 1,
},
{
numP2SHOutputs: 1,
},
// Assert each input/output increments input/output counts.
{
numP2PKHInputs: 253,
},
{
numP2WKHInputs: 253,
},
{
numP2WSHInputs: 253,
},
{
numNestedP2WKHInputs: 253,
},
{
numNestedP2WSHInputs: 253,
},
{
numP2WKHOutputs: 253,
},
{
numP2PKHOutputs: 253,
},
{
numP2WSHOutputs: 253,
},
{
numP2SHOutputs: 253,
},
// Assert basic combinations of inputs and outputs.
{
numP2PKHInputs: 1,
numP2PKHOutputs: 2,
},
{
numP2PKHInputs: 1,
numP2WKHInputs: 1,
numP2WKHOutputs: 1,
numP2WSHOutputs: 1,
},
{
numP2WKHInputs: 1,
numP2WKHOutputs: 1,
numP2WSHOutputs: 1,
},
{
numP2WKHInputs: 2,
numP2WKHOutputs: 1,
numP2WSHOutputs: 1,
},
{
numP2WSHInputs: 1,
numP2WKHOutputs: 1,
},
{
numP2PKHInputs: 1,
numP2SHOutputs: 1,
},
{
numNestedP2WKHInputs: 1,
numP2WKHOutputs: 1,
},
{
numNestedP2WSHInputs: 1,
numP2WKHOutputs: 1,
},
// Assert disparate input/output types increment total
// input/output counts.
{
numP2PKHInputs: 50,
numP2WKHInputs: 50,
numP2WSHInputs: 51,
numNestedP2WKHInputs: 51,
numNestedP2WSHInputs: 51,
numP2WKHOutputs: 1,
},
{
numP2WKHInputs: 1,
numP2WKHOutputs: 63,
numP2PKHOutputs: 63,
numP2WSHOutputs: 63,
numP2SHOutputs: 64,
},
{
numP2PKHInputs: 50,
numP2WKHInputs: 50,
numP2WSHInputs: 51,
numNestedP2WKHInputs: 51,
numNestedP2WSHInputs: 51,
numP2WKHOutputs: 63,
numP2PKHOutputs: 63,
numP2WSHOutputs: 63,
numP2SHOutputs: 64,
},
}
for i, test := range testCases {
var weightEstimate input.TxWeightEstimator
tx := wire.NewMsgTx(1)
for j := 0; j < test.numP2PKHInputs; j++ {
weightEstimate.AddP2PKHInput()
signature := make([]byte, 73)
compressedPubKey := make([]byte, 33)
scriptSig, err := txscript.NewScriptBuilder().AddData(signature).
AddData(compressedPubKey).Script()
if err != nil {
t.Fatalf("Failed to generate scriptSig: %v", err)
}
tx.AddTxIn(&wire.TxIn{SignatureScript: scriptSig})
}
for j := 0; j < test.numP2WKHInputs; j++ {
weightEstimate.AddP2WKHInput()
signature := make([]byte, 73)
compressedPubKey := make([]byte, 33)
witness := wire.TxWitness{signature, compressedPubKey}
tx.AddTxIn(&wire.TxIn{Witness: witness})
}
for j := 0; j < test.numP2WSHInputs; j++ {
weightEstimate.AddWitnessInput(42)
witnessScript := make([]byte, 40)
witness := wire.TxWitness{witnessScript}
tx.AddTxIn(&wire.TxIn{Witness: witness})
}
for j := 0; j < test.numNestedP2WKHInputs; j++ {
weightEstimate.AddNestedP2WKHInput()
signature := make([]byte, 73)
compressedPubKey := make([]byte, 33)
witness := wire.TxWitness{signature, compressedPubKey}
scriptSig, err := txscript.NewScriptBuilder().AddData(p2wkhScript).
Script()
if err != nil {
t.Fatalf("Failed to generate scriptSig: %v", err)
}
tx.AddTxIn(&wire.TxIn{SignatureScript: scriptSig, Witness: witness})
}
for j := 0; j < test.numNestedP2WSHInputs; j++ {
weightEstimate.AddNestedP2WSHInput(42)
witnessScript := make([]byte, 40)
witness := wire.TxWitness{witnessScript}
scriptSig, err := txscript.NewScriptBuilder().AddData(p2wshScript).
Script()
if err != nil {
t.Fatalf("Failed to generate scriptSig: %v", err)
}
tx.AddTxIn(&wire.TxIn{SignatureScript: scriptSig, Witness: witness})
}
for j := 0; j < test.numP2PKHOutputs; j++ {
weightEstimate.AddP2PKHOutput()
tx.AddTxOut(&wire.TxOut{PkScript: p2pkhScript})
}
for j := 0; j < test.numP2WKHOutputs; j++ {
weightEstimate.AddP2WKHOutput()
tx.AddTxOut(&wire.TxOut{PkScript: p2wkhScript})
}
for j := 0; j < test.numP2WSHOutputs; j++ {
weightEstimate.AddP2WSHOutput()
tx.AddTxOut(&wire.TxOut{PkScript: p2wshScript})
}
for j := 0; j < test.numP2SHOutputs; j++ {
weightEstimate.AddP2SHOutput()
tx.AddTxOut(&wire.TxOut{PkScript: p2shScript})
}
expectedWeight := blockchain.GetTransactionWeight(btcutil.NewTx(tx))
if weightEstimate.Weight() != int(expectedWeight) {
t.Errorf("Case %d: Got wrong weight: expected %d, got %d",
i, expectedWeight, weightEstimate.Weight())
}
}
}