Official Go implementation of the Ethereum protocol
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go-ethereum/eth/tracers/internal/tracetest/calltrace_test.go

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// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package tracetest
import (
"encoding/json"
"io/ioutil"
"math/big"
"path/filepath"
"reflect"
"strings"
"testing"
"unicode"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth/tracers"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/tests"
// Force-load native and js pacakges, to trigger registration
_ "github.com/ethereum/go-ethereum/eth/tracers/js"
_ "github.com/ethereum/go-ethereum/eth/tracers/native"
)
// To generate a new callTracer test, copy paste the makeTest method below into
// a Geth console and call it with a transaction hash you which to export.
/*
// makeTest generates a callTracer test by running a prestate reassembled and a
// call trace run, assembling all the gathered information into a test case.
var makeTest = function(tx, rewind) {
// Generate the genesis block from the block, transaction and prestate data
var block = eth.getBlock(eth.getTransaction(tx).blockHash);
var genesis = eth.getBlock(block.parentHash);
delete genesis.gasUsed;
delete genesis.logsBloom;
delete genesis.parentHash;
delete genesis.receiptsRoot;
delete genesis.sha3Uncles;
delete genesis.size;
delete genesis.transactions;
delete genesis.transactionsRoot;
delete genesis.uncles;
genesis.gasLimit = genesis.gasLimit.toString();
genesis.number = genesis.number.toString();
genesis.timestamp = genesis.timestamp.toString();
genesis.alloc = debug.traceTransaction(tx, {tracer: "prestateTracer", rewind: rewind});
for (var key in genesis.alloc) {
genesis.alloc[key].nonce = genesis.alloc[key].nonce.toString();
}
genesis.config = admin.nodeInfo.protocols.eth.config;
// Generate the call trace and produce the test input
var result = debug.traceTransaction(tx, {tracer: "callTracer", rewind: rewind});
delete result.time;
console.log(JSON.stringify({
genesis: genesis,
context: {
number: block.number.toString(),
difficulty: block.difficulty,
timestamp: block.timestamp.toString(),
gasLimit: block.gasLimit.toString(),
miner: block.miner,
},
input: eth.getRawTransaction(tx),
result: result,
}, null, 2));
}
*/
type callContext struct {
Number math.HexOrDecimal64 `json:"number"`
Difficulty *math.HexOrDecimal256 `json:"difficulty"`
Time math.HexOrDecimal64 `json:"timestamp"`
GasLimit math.HexOrDecimal64 `json:"gasLimit"`
Miner common.Address `json:"miner"`
}
// callTrace is the result of a callTracer run.
type callTrace struct {
Type string `json:"type"`
From common.Address `json:"from"`
To common.Address `json:"to"`
Input hexutil.Bytes `json:"input"`
Output hexutil.Bytes `json:"output"`
Gas *hexutil.Uint64 `json:"gas,omitempty"`
GasUsed *hexutil.Uint64 `json:"gasUsed,omitempty"`
Value *hexutil.Big `json:"value,omitempty"`
Error string `json:"error,omitempty"`
Calls []callTrace `json:"calls,omitempty"`
}
// callTracerTest defines a single test to check the call tracer against.
type callTracerTest struct {
Genesis *core.Genesis `json:"genesis"`
Context *callContext `json:"context"`
Input string `json:"input"`
Result *callTrace `json:"result"`
}
// Iterates over all the input-output datasets in the tracer test harness and
// runs the JavaScript tracers against them.
func TestCallTracerLegacy(t *testing.T) {
testCallTracer("callTracerLegacy", "call_tracer_legacy", t)
}
func TestCallTracerNative(t *testing.T) {
testCallTracer("callTracer", "call_tracer", t)
}
func testCallTracer(tracerName string, dirPath string, t *testing.T) {
files, err := ioutil.ReadDir(filepath.Join("testdata", dirPath))
if err != nil {
t.Fatalf("failed to retrieve tracer test suite: %v", err)
}
for _, file := range files {
if !strings.HasSuffix(file.Name(), ".json") {
continue
}
file := file // capture range variable
t.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(t *testing.T) {
t.Parallel()
var (
test = new(callTracerTest)
tx = new(types.Transaction)
)
// Call tracer test found, read if from disk
if blob, err := ioutil.ReadFile(filepath.Join("testdata", dirPath, file.Name())); err != nil {
t.Fatalf("failed to read testcase: %v", err)
} else if err := json.Unmarshal(blob, test); err != nil {
t.Fatalf("failed to parse testcase: %v", err)
}
if err := rlp.DecodeBytes(common.FromHex(test.Input), tx); err != nil {
t.Fatalf("failed to parse testcase input: %v", err)
}
// Configure a blockchain with the given prestate
var (
signer = types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)))
origin, _ = signer.Sender(tx)
txContext = vm.TxContext{
Origin: origin,
GasPrice: tx.GasPrice(),
}
context = vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Coinbase: test.Context.Miner,
BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
Time: new(big.Int).SetUint64(uint64(test.Context.Time)),
Difficulty: (*big.Int)(test.Context.Difficulty),
GasLimit: uint64(test.Context.GasLimit),
}
_, statedb = tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false)
)
tracer, err := tracers.New(tracerName, new(tracers.Context))
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}
evm := vm.NewEVM(context, txContext, statedb, test.Genesis.Config, vm.Config{Debug: true, Tracer: tracer})
msg, err := tx.AsMessage(signer, nil)
if err != nil {
t.Fatalf("failed to prepare transaction for tracing: %v", err)
}
st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
if _, err = st.TransitionDb(); err != nil {
t.Fatalf("failed to execute transaction: %v", err)
}
// Retrieve the trace result and compare against the etalon
res, err := tracer.GetResult()
if err != nil {
t.Fatalf("failed to retrieve trace result: %v", err)
}
ret := new(callTrace)
if err := json.Unmarshal(res, ret); err != nil {
t.Fatalf("failed to unmarshal trace result: %v", err)
}
if !jsonEqual(ret, test.Result) {
// uncomment this for easier debugging
//have, _ := json.MarshalIndent(ret, "", " ")
//want, _ := json.MarshalIndent(test.Result, "", " ")
//t.Fatalf("trace mismatch: \nhave %+v\nwant %+v", string(have), string(want))
t.Fatalf("trace mismatch: \nhave %+v\nwant %+v", ret, test.Result)
}
})
}
}
// jsonEqual is similar to reflect.DeepEqual, but does a 'bounce' via json prior to
// comparison
func jsonEqual(x, y interface{}) bool {
xTrace := new(callTrace)
yTrace := new(callTrace)
if xj, err := json.Marshal(x); err == nil {
json.Unmarshal(xj, xTrace)
} else {
return false
}
if yj, err := json.Marshal(y); err == nil {
json.Unmarshal(yj, yTrace)
} else {
return false
}
return reflect.DeepEqual(xTrace, yTrace)
}
// camel converts a snake cased input string into a camel cased output.
func camel(str string) string {
pieces := strings.Split(str, "_")
for i := 1; i < len(pieces); i++ {
pieces[i] = string(unicode.ToUpper(rune(pieces[i][0]))) + pieces[i][1:]
}
return strings.Join(pieces, "")
}
func BenchmarkTracers(b *testing.B) {
files, err := ioutil.ReadDir(filepath.Join("testdata", "call_tracer"))
if err != nil {
b.Fatalf("failed to retrieve tracer test suite: %v", err)
}
for _, file := range files {
if !strings.HasSuffix(file.Name(), ".json") {
continue
}
file := file // capture range variable
b.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(b *testing.B) {
blob, err := ioutil.ReadFile(filepath.Join("testdata", "call_tracer", file.Name()))
if err != nil {
b.Fatalf("failed to read testcase: %v", err)
}
test := new(callTracerTest)
if err := json.Unmarshal(blob, test); err != nil {
b.Fatalf("failed to parse testcase: %v", err)
}
benchTracer("callTracerNative", test, b)
})
}
}
func benchTracer(tracerName string, test *callTracerTest, b *testing.B) {
// Configure a blockchain with the given prestate
tx := new(types.Transaction)
if err := rlp.DecodeBytes(common.FromHex(test.Input), tx); err != nil {
b.Fatalf("failed to parse testcase input: %v", err)
}
signer := types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)))
msg, err := tx.AsMessage(signer, nil)
if err != nil {
b.Fatalf("failed to prepare transaction for tracing: %v", err)
}
origin, _ := signer.Sender(tx)
txContext := vm.TxContext{
Origin: origin,
GasPrice: tx.GasPrice(),
}
context := vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Coinbase: test.Context.Miner,
BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
Time: new(big.Int).SetUint64(uint64(test.Context.Time)),
Difficulty: (*big.Int)(test.Context.Difficulty),
GasLimit: uint64(test.Context.GasLimit),
}
_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
tracer, err := tracers.New(tracerName, new(tracers.Context))
if err != nil {
b.Fatalf("failed to create call tracer: %v", err)
}
evm := vm.NewEVM(context, txContext, statedb, test.Genesis.Config, vm.Config{Debug: true, Tracer: tracer})
snap := statedb.Snapshot()
st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
if _, err = st.TransitionDb(); err != nil {
b.Fatalf("failed to execute transaction: %v", err)
}
if _, err = tracer.GetResult(); err != nil {
b.Fatal(err)
}
statedb.RevertToSnapshot(snap)
}
}
// TestZeroValueToNotExitCall tests the calltracer(s) on the following:
// Tx to A, A calls B with zero value. B does not already exist.
// Expected: that enter/exit is invoked and the inner call is shown in the result
func TestZeroValueToNotExitCall(t *testing.T) {
var to = common.HexToAddress("0x00000000000000000000000000000000deadbeef")
privkey, err := crypto.HexToECDSA("0000000000000000deadbeef00000000000000000000000000000000deadbeef")
if err != nil {
t.Fatalf("err %v", err)
}
signer := types.NewEIP155Signer(big.NewInt(1))
tx, err := types.SignNewTx(privkey, signer, &types.LegacyTx{
GasPrice: big.NewInt(0),
Gas: 50000,
To: &to,
})
if err != nil {
t.Fatalf("err %v", err)
}
origin, _ := signer.Sender(tx)
txContext := vm.TxContext{
Origin: origin,
GasPrice: big.NewInt(1),
}
context := vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Coinbase: common.Address{},
BlockNumber: new(big.Int).SetUint64(8000000),
Time: new(big.Int).SetUint64(5),
Difficulty: big.NewInt(0x30000),
GasLimit: uint64(6000000),
}
var code = []byte{
byte(vm.PUSH1), 0x0, byte(vm.DUP1), byte(vm.DUP1), byte(vm.DUP1), // in and outs zero
byte(vm.DUP1), byte(vm.PUSH1), 0xff, byte(vm.GAS), // value=0,address=0xff, gas=GAS
byte(vm.CALL),
}
var alloc = core.GenesisAlloc{
to: core.GenesisAccount{
Nonce: 1,
Code: code,
},
origin: core.GenesisAccount{
Nonce: 0,
Balance: big.NewInt(500000000000000),
},
}
_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), alloc, false)
// Create the tracer, the EVM environment and run it
tracer, err := tracers.New("callTracer", nil)
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}
evm := vm.NewEVM(context, txContext, statedb, params.MainnetChainConfig, vm.Config{Debug: true, Tracer: tracer})
msg, err := tx.AsMessage(signer, nil)
if err != nil {
t.Fatalf("failed to prepare transaction for tracing: %v", err)
}
st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
if _, err = st.TransitionDb(); err != nil {
t.Fatalf("failed to execute transaction: %v", err)
}
// Retrieve the trace result and compare against the etalon
res, err := tracer.GetResult()
if err != nil {
t.Fatalf("failed to retrieve trace result: %v", err)
}
have := new(callTrace)
if err := json.Unmarshal(res, have); err != nil {
t.Fatalf("failed to unmarshal trace result: %v", err)
}
wantStr := `{"type":"CALL","from":"0x682a80a6f560eec50d54e63cbeda1c324c5f8d1b","to":"0x00000000000000000000000000000000deadbeef","value":"0x0","gas":"0x7148","gasUsed":"0x2d0","input":"0x","output":"0x","calls":[{"type":"CALL","from":"0x00000000000000000000000000000000deadbeef","to":"0x00000000000000000000000000000000000000ff","value":"0x0","gas":"0x6cbf","gasUsed":"0x0","input":"0x","output":"0x"}]}`
want := new(callTrace)
json.Unmarshal([]byte(wantStr), want)
if !jsonEqual(have, want) {
t.Error("have != want")
}
}