131 lines
3.5 KiB
Go
131 lines
3.5 KiB
Go
// Copyright (c) 2018-2019 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package txscript
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"testing"
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"github.com/btcsuite/btcd/wire"
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)
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var (
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// manyInputsBenchTx is a transaction that contains a lot of inputs which is
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// useful for benchmarking signature hash calculation.
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manyInputsBenchTx wire.MsgTx
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// A mock previous output script to use in the signing benchmark.
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prevOutScript = hexToBytes("a914f5916158e3e2c4551c1796708db8367207ed13bb87")
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)
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func init() {
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// tx 620f57c92cf05a7f7e7f7d28255d5f7089437bc48e34dcfebf7751d08b7fb8f5
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txHex, err := ioutil.ReadFile("data/many_inputs_tx.hex")
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if err != nil {
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panic(fmt.Sprintf("unable to read benchmark tx file: %v", err))
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}
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txBytes := hexToBytes(string(txHex))
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err = manyInputsBenchTx.Deserialize(bytes.NewReader(txBytes))
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if err != nil {
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panic(err)
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}
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}
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// BenchmarkCalcSigHash benchmarks how long it takes to calculate the signature
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// hashes for all inputs of a transaction with many inputs.
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func BenchmarkCalcSigHash(b *testing.B) {
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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for j := 0; j < len(manyInputsBenchTx.TxIn); j++ {
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_, err := CalcSignatureHash(prevOutScript, SigHashAll,
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&manyInputsBenchTx, j)
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if err != nil {
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b.Fatalf("failed to calc signature hash: %v", err)
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}
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}
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}
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}
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// BenchmarkCalcWitnessSigHash benchmarks how long it takes to calculate the
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// witness signature hashes for all inputs of a transaction with many inputs.
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func BenchmarkCalcWitnessSigHash(b *testing.B) {
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sigHashes := NewTxSigHashes(&manyInputsBenchTx)
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b.ResetTimer()
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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for j := 0; j < len(manyInputsBenchTx.TxIn); j++ {
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_, err := CalcWitnessSigHash(
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prevOutScript, sigHashes, SigHashAll,
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&manyInputsBenchTx, j, 5,
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)
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if err != nil {
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b.Fatalf("failed to calc signature hash: %v", err)
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}
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}
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}
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}
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// genComplexScript returns a script comprised of half as many opcodes as the
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// maximum allowed followed by as many max size data pushes fit without
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// exceeding the max allowed script size.
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func genComplexScript() ([]byte, error) {
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var scriptLen int
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builder := NewScriptBuilder()
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for i := 0; i < MaxOpsPerScript/2; i++ {
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builder.AddOp(OP_TRUE)
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scriptLen++
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}
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maxData := bytes.Repeat([]byte{0x02}, MaxScriptElementSize)
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for i := 0; i < (MaxScriptSize-scriptLen)/(MaxScriptElementSize+3); i++ {
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builder.AddData(maxData)
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}
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return builder.Script()
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}
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// BenchmarkScriptParsing benchmarks how long it takes to parse a very large
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// script.
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func BenchmarkScriptParsing(b *testing.B) {
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script, err := genComplexScript()
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if err != nil {
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b.Fatalf("failed to create benchmark script: %v", err)
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}
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const scriptVersion = 0
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b.ResetTimer()
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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tokenizer := MakeScriptTokenizer(scriptVersion, script)
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for tokenizer.Next() {
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_ = tokenizer.Opcode()
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_ = tokenizer.Data()
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_ = tokenizer.ByteIndex()
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}
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if err := tokenizer.Err(); err != nil {
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b.Fatalf("failed to parse script: %v", err)
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}
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}
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}
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// BenchmarkDisasmString benchmarks how long it takes to disassemble a very
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// large script.
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func BenchmarkDisasmString(b *testing.B) {
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script, err := genComplexScript()
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if err != nil {
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b.Fatalf("failed to create benchmark script: %v", err)
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}
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b.ResetTimer()
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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_, err := DisasmString(script)
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if err != nil {
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b.Fatalf("failed to disasm script: %v", err)
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}
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}
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}
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