b1cec853be
Currently, one can use the "withLogs" parameter to include logs in the callTracer results, which allows the user to see at which trace level was each log emitted. This commit adds a position field to the logs which determine the exact ordering of a call's logs and its subcalls. This would be useful e.g. for explorers wishing to display the flow of execution. Co-authored-by: jsvisa <delweng@gmail.com>
407 lines
15 KiB
Go
407 lines
15 KiB
Go
// Copyright 2021 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package tracetest
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import (
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"encoding/json"
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"math/big"
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"os"
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"path/filepath"
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"strings"
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"testing"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/eth/tracers"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/tests"
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)
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type callContext struct {
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Number math.HexOrDecimal64 `json:"number"`
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Difficulty *math.HexOrDecimal256 `json:"difficulty"`
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Time math.HexOrDecimal64 `json:"timestamp"`
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GasLimit math.HexOrDecimal64 `json:"gasLimit"`
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Miner common.Address `json:"miner"`
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}
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// callLog is the result of LOG opCode
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type callLog struct {
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Address common.Address `json:"address"`
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Topics []common.Hash `json:"topics"`
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Data hexutil.Bytes `json:"data"`
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Position hexutil.Uint `json:"position"`
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}
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// callTrace is the result of a callTracer run.
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type callTrace struct {
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From common.Address `json:"from"`
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Gas *hexutil.Uint64 `json:"gas"`
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GasUsed *hexutil.Uint64 `json:"gasUsed"`
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To *common.Address `json:"to,omitempty"`
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Input hexutil.Bytes `json:"input"`
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Output hexutil.Bytes `json:"output,omitempty"`
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Error string `json:"error,omitempty"`
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RevertReason string `json:"revertReason,omitempty"`
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Calls []callTrace `json:"calls,omitempty"`
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Logs []callLog `json:"logs,omitempty"`
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Value *hexutil.Big `json:"value,omitempty"`
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// Gencodec adds overridden fields at the end
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Type string `json:"type"`
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}
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// callTracerTest defines a single test to check the call tracer against.
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type callTracerTest struct {
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Genesis *core.Genesis `json:"genesis"`
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Context *callContext `json:"context"`
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Input string `json:"input"`
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TracerConfig json.RawMessage `json:"tracerConfig"`
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Result *callTrace `json:"result"`
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}
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// Iterates over all the input-output datasets in the tracer test harness and
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// runs the JavaScript tracers against them.
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func TestCallTracerLegacy(t *testing.T) {
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testCallTracer("callTracerLegacy", "call_tracer_legacy", t)
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}
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func TestCallTracerNative(t *testing.T) {
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testCallTracer("callTracer", "call_tracer", t)
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}
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func TestCallTracerNativeWithLog(t *testing.T) {
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testCallTracer("callTracer", "call_tracer_withLog", t)
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}
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func testCallTracer(tracerName string, dirPath string, t *testing.T) {
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isLegacy := strings.HasSuffix(dirPath, "_legacy")
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files, err := os.ReadDir(filepath.Join("testdata", dirPath))
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if err != nil {
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t.Fatalf("failed to retrieve tracer test suite: %v", err)
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}
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for _, file := range files {
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if !strings.HasSuffix(file.Name(), ".json") {
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continue
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}
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file := file // capture range variable
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t.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(t *testing.T) {
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t.Parallel()
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var (
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test = new(callTracerTest)
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tx = new(types.Transaction)
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)
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// Call tracer test found, read if from disk
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if blob, err := os.ReadFile(filepath.Join("testdata", dirPath, file.Name())); err != nil {
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t.Fatalf("failed to read testcase: %v", err)
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} else if err := json.Unmarshal(blob, test); err != nil {
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t.Fatalf("failed to parse testcase: %v", err)
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}
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if err := tx.UnmarshalBinary(common.FromHex(test.Input)); err != nil {
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t.Fatalf("failed to parse testcase input: %v", err)
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}
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// Configure a blockchain with the given prestate
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var (
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signer = types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)), uint64(test.Context.Time))
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origin, _ = signer.Sender(tx)
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txContext = vm.TxContext{
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Origin: origin,
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GasPrice: tx.GasPrice(),
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}
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context = vm.BlockContext{
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CanTransfer: core.CanTransfer,
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Transfer: core.Transfer,
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Coinbase: test.Context.Miner,
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BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
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Time: uint64(test.Context.Time),
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Difficulty: (*big.Int)(test.Context.Difficulty),
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GasLimit: uint64(test.Context.GasLimit),
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BaseFee: test.Genesis.BaseFee,
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}
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triedb, _, statedb = tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false, rawdb.HashScheme)
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)
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triedb.Close()
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tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig)
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if err != nil {
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t.Fatalf("failed to create call tracer: %v", err)
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}
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evm := vm.NewEVM(context, txContext, statedb, test.Genesis.Config, vm.Config{Tracer: tracer})
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msg, err := core.TransactionToMessage(tx, signer, nil)
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if err != nil {
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t.Fatalf("failed to prepare transaction for tracing: %v", err)
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}
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vmRet, err := core.ApplyMessage(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
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if err != nil {
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t.Fatalf("failed to execute transaction: %v", err)
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}
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// Retrieve the trace result and compare against the expected.
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res, err := tracer.GetResult()
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if err != nil {
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t.Fatalf("failed to retrieve trace result: %v", err)
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}
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// The legacy javascript calltracer marshals json in js, which
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// is not deterministic (as opposed to the golang json encoder).
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if isLegacy {
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// This is a tweak to make it deterministic. Can be removed when
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// we remove the legacy tracer.
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var x callTrace
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json.Unmarshal(res, &x)
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res, _ = json.Marshal(x)
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}
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want, err := json.Marshal(test.Result)
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if err != nil {
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t.Fatalf("failed to marshal test: %v", err)
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}
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if string(want) != string(res) {
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t.Fatalf("trace mismatch\n have: %v\n want: %v\n", string(res), string(want))
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}
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// Sanity check: compare top call's gas used against vm result
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type simpleResult struct {
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GasUsed hexutil.Uint64
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}
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var topCall simpleResult
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if err := json.Unmarshal(res, &topCall); err != nil {
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t.Fatalf("failed to unmarshal top calls gasUsed: %v", err)
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}
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if uint64(topCall.GasUsed) != vmRet.UsedGas {
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t.Fatalf("top call has invalid gasUsed. have: %d want: %d", topCall.GasUsed, vmRet.UsedGas)
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}
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})
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}
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}
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func BenchmarkTracers(b *testing.B) {
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files, err := os.ReadDir(filepath.Join("testdata", "call_tracer"))
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if err != nil {
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b.Fatalf("failed to retrieve tracer test suite: %v", err)
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}
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for _, file := range files {
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if !strings.HasSuffix(file.Name(), ".json") {
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continue
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}
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file := file // capture range variable
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b.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(b *testing.B) {
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blob, err := os.ReadFile(filepath.Join("testdata", "call_tracer", file.Name()))
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if err != nil {
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b.Fatalf("failed to read testcase: %v", err)
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}
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test := new(callTracerTest)
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if err := json.Unmarshal(blob, test); err != nil {
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b.Fatalf("failed to parse testcase: %v", err)
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}
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benchTracer("callTracer", test, b)
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})
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}
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}
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func benchTracer(tracerName string, test *callTracerTest, b *testing.B) {
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// Configure a blockchain with the given prestate
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tx := new(types.Transaction)
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if err := rlp.DecodeBytes(common.FromHex(test.Input), tx); err != nil {
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b.Fatalf("failed to parse testcase input: %v", err)
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}
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signer := types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)), uint64(test.Context.Time))
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msg, err := core.TransactionToMessage(tx, signer, nil)
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if err != nil {
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b.Fatalf("failed to prepare transaction for tracing: %v", err)
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}
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origin, _ := signer.Sender(tx)
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txContext := vm.TxContext{
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Origin: origin,
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GasPrice: tx.GasPrice(),
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}
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context := vm.BlockContext{
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CanTransfer: core.CanTransfer,
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Transfer: core.Transfer,
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Coinbase: test.Context.Miner,
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BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
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Time: uint64(test.Context.Time),
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Difficulty: (*big.Int)(test.Context.Difficulty),
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GasLimit: uint64(test.Context.GasLimit),
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}
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triedb, _, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false, rawdb.HashScheme)
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defer triedb.Close()
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), nil)
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if err != nil {
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b.Fatalf("failed to create call tracer: %v", err)
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}
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evm := vm.NewEVM(context, txContext, statedb, test.Genesis.Config, vm.Config{Tracer: tracer})
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snap := statedb.Snapshot()
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st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
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if _, err = st.TransitionDb(); err != nil {
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b.Fatalf("failed to execute transaction: %v", err)
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}
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if _, err = tracer.GetResult(); err != nil {
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b.Fatal(err)
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}
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statedb.RevertToSnapshot(snap)
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}
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}
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func TestInternals(t *testing.T) {
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var (
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to = common.HexToAddress("0x00000000000000000000000000000000deadbeef")
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origin = common.HexToAddress("0x00000000000000000000000000000000feed")
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txContext = vm.TxContext{
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Origin: origin,
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GasPrice: big.NewInt(1),
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}
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context = vm.BlockContext{
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CanTransfer: core.CanTransfer,
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Transfer: core.Transfer,
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Coinbase: common.Address{},
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BlockNumber: new(big.Int).SetUint64(8000000),
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Time: 5,
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Difficulty: big.NewInt(0x30000),
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GasLimit: uint64(6000000),
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}
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)
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mkTracer := func(name string, cfg json.RawMessage) tracers.Tracer {
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tr, err := tracers.DefaultDirectory.New(name, nil, cfg)
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if err != nil {
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t.Fatalf("failed to create call tracer: %v", err)
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}
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return tr
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}
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for _, tc := range []struct {
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name string
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code []byte
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tracer tracers.Tracer
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want string
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}{
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{
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// TestZeroValueToNotExitCall tests the calltracer(s) on the following:
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// Tx to A, A calls B with zero value. B does not already exist.
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// Expected: that enter/exit is invoked and the inner call is shown in the result
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name: "ZeroValueToNotExitCall",
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code: []byte{
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byte(vm.PUSH1), 0x0, byte(vm.DUP1), byte(vm.DUP1), byte(vm.DUP1), // in and outs zero
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byte(vm.DUP1), byte(vm.PUSH1), 0xff, byte(vm.GAS), // value=0,address=0xff, gas=GAS
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byte(vm.CALL),
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},
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tracer: mkTracer("callTracer", nil),
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want: `{"from":"0x000000000000000000000000000000000000feed","gas":"0x13880","gasUsed":"0x54d8","to":"0x00000000000000000000000000000000deadbeef","input":"0x","calls":[{"from":"0x00000000000000000000000000000000deadbeef","gas":"0xe01a","gasUsed":"0x0","to":"0x00000000000000000000000000000000000000ff","input":"0x","value":"0x0","type":"CALL"}],"value":"0x0","type":"CALL"}`,
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},
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{
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name: "Stack depletion in LOG0",
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code: []byte{byte(vm.LOG3)},
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tracer: mkTracer("callTracer", json.RawMessage(`{ "withLog": true }`)),
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want: `{"from":"0x000000000000000000000000000000000000feed","gas":"0x13880","gasUsed":"0x13880","to":"0x00000000000000000000000000000000deadbeef","input":"0x","error":"stack underflow (0 \u003c=\u003e 5)","value":"0x0","type":"CALL"}`,
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},
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{
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name: "Mem expansion in LOG0",
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code: []byte{
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byte(vm.PUSH1), 0x1,
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byte(vm.PUSH1), 0x0,
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byte(vm.MSTORE),
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byte(vm.PUSH1), 0xff,
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byte(vm.PUSH1), 0x0,
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byte(vm.LOG0),
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},
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tracer: mkTracer("callTracer", json.RawMessage(`{ "withLog": true }`)),
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want: `{"from":"0x000000000000000000000000000000000000feed","gas":"0x13880","gasUsed":"0x5b9e","to":"0x00000000000000000000000000000000deadbeef","input":"0x","logs":[{"address":"0x00000000000000000000000000000000deadbeef","topics":[],"data":"0x000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","position":"0x0"}],"value":"0x0","type":"CALL"}`,
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},
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{
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// Leads to OOM on the prestate tracer
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name: "Prestate-tracer - CREATE2 OOM",
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code: []byte{
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byte(vm.PUSH1), 0x1,
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byte(vm.PUSH1), 0x0,
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byte(vm.MSTORE),
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byte(vm.PUSH1), 0x1,
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byte(vm.PUSH5), 0xff, 0xff, 0xff, 0xff, 0xff,
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byte(vm.PUSH1), 0x1,
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byte(vm.PUSH1), 0x0,
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byte(vm.CREATE2),
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byte(vm.PUSH1), 0xff,
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byte(vm.PUSH1), 0x0,
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byte(vm.LOG0),
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},
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tracer: mkTracer("prestateTracer", nil),
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want: `{"0x0000000000000000000000000000000000000000":{"balance":"0x0"},"0x000000000000000000000000000000000000feed":{"balance":"0x1c6bf52647880"},"0x00000000000000000000000000000000deadbeef":{"balance":"0x0","code":"0x6001600052600164ffffffffff60016000f560ff6000a0"}}`,
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},
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{
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// CREATE2 which requires padding memory by prestate tracer
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name: "Prestate-tracer - CREATE2 Memory padding",
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code: []byte{
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byte(vm.PUSH1), 0x1,
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byte(vm.PUSH1), 0x0,
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byte(vm.MSTORE),
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byte(vm.PUSH1), 0x1,
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byte(vm.PUSH1), 0xff,
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byte(vm.PUSH1), 0x1,
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byte(vm.PUSH1), 0x0,
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byte(vm.CREATE2),
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byte(vm.PUSH1), 0xff,
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byte(vm.PUSH1), 0x0,
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byte(vm.LOG0),
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},
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tracer: mkTracer("prestateTracer", nil),
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want: `{"0x0000000000000000000000000000000000000000":{"balance":"0x0"},"0x000000000000000000000000000000000000feed":{"balance":"0x1c6bf52647880"},"0x00000000000000000000000000000000deadbeef":{"balance":"0x0","code":"0x6001600052600160ff60016000f560ff6000a0"},"0x91ff9a805d36f54e3e272e230f3e3f5c1b330804":{"balance":"0x0"}}`,
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},
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} {
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t.Run(tc.name, func(t *testing.T) {
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triedb, _, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(),
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core.GenesisAlloc{
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to: core.GenesisAccount{
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Code: tc.code,
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},
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origin: core.GenesisAccount{
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Balance: big.NewInt(500000000000000),
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},
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}, false, rawdb.HashScheme)
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defer triedb.Close()
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evm := vm.NewEVM(context, txContext, statedb, params.MainnetChainConfig, vm.Config{Tracer: tc.tracer})
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msg := &core.Message{
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To: &to,
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From: origin,
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Value: big.NewInt(0),
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GasLimit: 80000,
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GasPrice: big.NewInt(0),
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GasFeeCap: big.NewInt(0),
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GasTipCap: big.NewInt(0),
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SkipAccountChecks: false,
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}
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st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(msg.GasLimit))
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if _, err := st.TransitionDb(); err != nil {
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t.Fatalf("test %v: failed to execute transaction: %v", tc.name, err)
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}
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// Retrieve the trace result and compare against the expected
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res, err := tc.tracer.GetResult()
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if err != nil {
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t.Fatalf("test %v: failed to retrieve trace result: %v", tc.name, err)
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}
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if string(res) != tc.want {
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t.Errorf("test %v: trace mismatch\n have: %v\n want: %v\n", tc.name, string(res), tc.want)
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}
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})
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}
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}
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