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eth/tracers: support for golang tracers + add golang callTracer (#23708)

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* eth/tracers: add basic native loader

* eth/tracers: add GetResult to tracer interface

* eth/tracers: add native call tracer

* eth/tracers: fix call tracer json result

* eth/tracers: minor fix

* eth/tracers: fix

* eth/tracers: fix benchTracer

* eth/tracers: test native call tracer

* eth/tracers: fix

* eth/tracers: rm extra make

Co-authored-by: Martin Holst Swende <martin@swende.se>

* eth/tracers: rm extra make

* eth/tracers: make callFrame private

* eth/tracers: clean-up and comments

* eth/tracers: add license

* eth/tracers: rework the model a bit

* eth/tracers: move tracecall tests to subpackage

* cmd/geth: load native tracers

* eth/tracers: minor fix

* eth/tracers: impl stop

* eth/tracers: add native noop tracer

* renamings

Co-authored-by: Martin Holst Swende <martin@swende.se>

* eth/tracers: more renamings

* eth/tracers: make jstracer non-exported, avoid cast

* eth/tracers, core/vm: rename vm.Tracer to vm.EVMLogger for clarity

* eth/tracers: minor comment fix

* eth/tracers/testing: lint nitpicks

* core,eth: cancel evm on nativecalltracer stop

* Revert "core,eth: cancel evm on nativecalltracer stop"

This reverts commit 01bb908790a369c1bb9d3937df9325c6857bf855.

* eth/tracers: linter nits

* eth/tracers: fix output on err

Co-authored-by: Martin Holst Swende <martin@swende.se>
This commit is contained in:
Sina Mahmoodi 2021-11-05 11:48:21 +01:00 committed by GitHub
parent 3bbeb94c1c
commit 8d7e6062ec
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
15 changed files with 560 additions and 250 deletions
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2
cmd/evm/internal/t8ntool/execution.go
View File

@ -96,7 +96,7 @@ type rejectedTx struct {
// Apply applies a set of transactions to a pre-state
func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
txs types.Transactions, miningReward int64,
getTracerFn func(txIndex int, txHash common.Hash) (tracer vm.Tracer, err error)) (*state.StateDB, *ExecutionResult, error) {
getTracerFn func(txIndex int, txHash common.Hash) (tracer vm.EVMLogger, err error)) (*state.StateDB, *ExecutionResult, error) {
// Capture errors for BLOCKHASH operation, if we haven't been supplied the
// required blockhashes

8
cmd/evm/internal/t8ntool/transition.go
View File

@ -89,10 +89,10 @@ func Transition(ctx *cli.Context) error {
var (
err error
tracer vm.Tracer
tracer vm.EVMLogger
baseDir = ""
)
var getTracer func(txIndex int, txHash common.Hash) (vm.Tracer, error)
var getTracer func(txIndex int, txHash common.Hash) (vm.EVMLogger, error)
// If user specified a basedir, make sure it exists
if ctx.IsSet(OutputBasedir.Name) {
@ -119,7 +119,7 @@ func Transition(ctx *cli.Context) error {
prevFile.Close()
}
}()
getTracer = func(txIndex int, txHash common.Hash) (vm.Tracer, error) {
getTracer = func(txIndex int, txHash common.Hash) (vm.EVMLogger, error) {
if prevFile != nil {
prevFile.Close()
}
@ -131,7 +131,7 @@ func Transition(ctx *cli.Context) error {
return vm.NewJSONLogger(logConfig, traceFile), nil
}
} else {
getTracer = func(txIndex int, txHash common.Hash) (tracer vm.Tracer, err error) {
getTracer = func(txIndex int, txHash common.Hash) (tracer vm.EVMLogger, err error) {
return nil, nil
}
}

2
cmd/evm/runner.go
View File

@ -116,7 +116,7 @@ func runCmd(ctx *cli.Context) error {
}
var (
tracer vm.Tracer
tracer vm.EVMLogger
debugLogger *vm.StructLogger
statedb *state.StateDB
chainConfig *params.ChainConfig

2
cmd/evm/staterunner.go
View File

@ -65,7 +65,7 @@ func stateTestCmd(ctx *cli.Context) error {
EnableReturnData: !ctx.GlobalBool(DisableReturnDataFlag.Name),
}
var (
tracer vm.Tracer
tracer vm.EVMLogger
debugger *vm.StructLogger
)
switch {

4
cmd/geth/main.go
View File

@ -39,6 +39,10 @@ import (
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/node"
// Force-load the native, to trigger registration
_ "github.com/ethereum/go-ethereum/eth/tracers/native"
"gopkg.in/urfave/cli.v1"
)

8
core/vm/interpreter.go
View File

@ -28,7 +28,7 @@ import (
// Config are the configuration options for the Interpreter
type Config struct {
Debug bool // Enables debugging
Tracer Tracer // Opcode logger
Tracer EVMLogger // Opcode logger
NoRecursion bool // Disables call, callcode, delegate call and create
NoBaseFee bool // Forces the EIP-1559 baseFee to 0 (needed for 0 price calls)
EnablePreimageRecording bool // Enables recording of SHA3/keccak preimages
@ -152,9 +152,9 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
pc = uint64(0) // program counter
cost uint64
// copies used by tracer
pcCopy uint64 // needed for the deferred Tracer
gasCopy uint64 // for Tracer to log gas remaining before execution
logged bool // deferred Tracer should ignore already logged steps
pcCopy uint64 // needed for the deferred EVMLogger
gasCopy uint64 // for EVMLogger to log gas remaining before execution
logged bool // deferred EVMLogger should ignore already logged steps
res []byte // result of the opcode execution function
)
// Don't move this deferrred function, it's placed before the capturestate-deferred method,

10
core/vm/logger.go
View File

@ -98,12 +98,12 @@ func (s *StructLog) ErrorString() string {
return ""
}
// Tracer is used to collect execution traces from an EVM transaction
// EVMLogger is used to collect execution traces from an EVM transaction
// execution. CaptureState is called for each step of the VM with the
// current VM state.
// Note that reference types are actual VM data structures; make copies
// if you need to retain them beyond the current call.
type Tracer interface {
type EVMLogger interface {
CaptureStart(env *EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int)
CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error)
CaptureEnter(typ OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int)
@ -112,7 +112,7 @@ type Tracer interface {
CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error)
}
// StructLogger is an EVM state logger and implements Tracer.
// StructLogger is an EVM state logger and implements EVMLogger.
//
// StructLogger can capture state based on the given Log configuration and also keeps
// a track record of modified storage which is used in reporting snapshots of the
@ -145,7 +145,7 @@ func (l *StructLogger) Reset() {
l.err = nil
}
// CaptureStart implements the Tracer interface to initialize the tracing operation.
// CaptureStart implements the EVMLogger interface to initialize the tracing operation.
func (l *StructLogger) CaptureStart(env *EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
}
@ -210,7 +210,7 @@ func (l *StructLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost ui
l.logs = append(l.logs, log)
}
// CaptureFault implements the Tracer interface to trace an execution fault
// CaptureFault implements the EVMLogger interface to trace an execution fault
// while running an opcode.
func (l *StructLogger) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error) {
}

24
eth/tracers/api.go
View File

@ -862,12 +862,14 @@ func (api *API) TraceCall(ctx context.Context, args ethapi.TransactionArgs, bloc
func (api *API) traceTx(ctx context.Context, message core.Message, txctx *Context, vmctx vm.BlockContext, statedb *state.StateDB, config *TraceConfig) (interface{}, error) {
// Assemble the structured logger or the JavaScript tracer
var (
tracer vm.Tracer
tracer vm.EVMLogger
err error
txContext = core.NewEVMTxContext(message)
)
switch {
case config != nil && config.Tracer != nil:
case config == nil:
tracer = vm.NewStructLogger(nil)
case config.Tracer != nil:
// Define a meaningful timeout of a single transaction trace
timeout := defaultTraceTimeout
if config.Timeout != nil {
@ -875,23 +877,19 @@ func (api *API) traceTx(ctx context.Context, message core.Message, txctx *Contex
return nil, err
}
}
// Constuct the JavaScript tracer to execute with
if tracer, err = New(*config.Tracer, txctx); err != nil {
if t, err := New(*config.Tracer, txctx); err != nil {
return nil, err
}
// Handle timeouts and RPC cancellations
} else {
deadlineCtx, cancel := context.WithTimeout(ctx, timeout)
go func() {
<-deadlineCtx.Done()
if deadlineCtx.Err() == context.DeadlineExceeded {
tracer.(*Tracer).Stop(errors.New("execution timeout"))
if errors.Is(deadlineCtx.Err(), context.DeadlineExceeded) {
t.Stop(errors.New("execution timeout"))
}
}()
defer cancel()
case config == nil:
tracer = vm.NewStructLogger(nil)
tracer = t
}
default:
tracer = vm.NewStructLogger(config.LogConfig)
}
@ -921,7 +919,7 @@ func (api *API) traceTx(ctx context.Context, message core.Message, txctx *Contex
StructLogs: ethapi.FormatLogs(tracer.StructLogs()),
}, nil
case *Tracer:
case Tracer:
return tracer.GetResult()
default:

170
eth/tracers/native/call.go Normal file
View File

@ -0,0 +1,170 @@
// 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 native
import (
"encoding/json"
"errors"
"math/big"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/tracers"
)
func init() {
tracers.RegisterNativeTracer("callTracerNative", NewCallTracer)
}
type callFrame struct {
Type string `json:"type"`
From string `json:"from"`
To string `json:"to,omitempty"`
Value string `json:"value,omitempty"`
Gas string `json:"gas"`
GasUsed string `json:"gasUsed"`
Input string `json:"input"`
Output string `json:"output,omitempty"`
Error string `json:"error,omitempty"`
Calls []callFrame `json:"calls,omitempty"`
}
type callTracer struct {
callstack []callFrame
interrupt uint32 // Atomic flag to signal execution interruption
reason error // Textual reason for the interruption
}
// NewCallTracer returns a native go tracer which tracks
// call frames of a tx, and implements vm.EVMLogger.
func NewCallTracer() tracers.Tracer {
// First callframe contains tx context info
// and is populated on start and end.
t := &callTracer{callstack: make([]callFrame, 1)}
return t
}
func (t *callTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
t.callstack[0] = callFrame{
Type: "CALL",
From: addrToHex(from),
To: addrToHex(to),
Input: bytesToHex(input),
Gas: uintToHex(gas),
Value: bigToHex(value),
}
if create {
t.callstack[0].Type = "CREATE"
}
}
func (t *callTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration, err error) {
t.callstack[0].GasUsed = uintToHex(gasUsed)
if err != nil {
t.callstack[0].Error = err.Error()
if err.Error() == "execution reverted" && len(output) > 0 {
t.callstack[0].Output = bytesToHex(output)
}
} else {
t.callstack[0].Output = bytesToHex(output)
}
}
func (t *callTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
}
func (t *callTracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, _ *vm.ScopeContext, depth int, err error) {
}
func (t *callTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
// Skip if tracing was interrupted
if atomic.LoadUint32(&t.interrupt) > 0 {
// TODO: env.Cancel()
return
}
call := callFrame{
Type: typ.String(),
From: addrToHex(from),
To: addrToHex(to),
Input: bytesToHex(input),
Gas: uintToHex(gas),
Value: bigToHex(value),
}
t.callstack = append(t.callstack, call)
}
func (t *callTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
size := len(t.callstack)
if size <= 1 {
return
}
// pop call
call := t.callstack[size-1]
t.callstack = t.callstack[:size-1]
size -= 1
call.GasUsed = uintToHex(gasUsed)
if err == nil {
call.Output = bytesToHex(output)
} else {
call.Error = err.Error()
if call.Type == "CREATE" || call.Type == "CREATE2" {
call.To = ""
}
}
t.callstack[size-1].Calls = append(t.callstack[size-1].Calls, call)
}
func (t *callTracer) GetResult() (json.RawMessage, error) {
if len(t.callstack) != 1 {
return nil, errors.New("incorrect number of top-level calls")
}
res, err := json.Marshal(t.callstack[0])
if err != nil {
return nil, err
}
return json.RawMessage(res), t.reason
}
func (t *callTracer) Stop(err error) {
t.reason = err
atomic.StoreUint32(&t.interrupt, 1)
}
func bytesToHex(s []byte) string {
return "0x" + common.Bytes2Hex(s)
}
func bigToHex(n *big.Int) string {
if n == nil {
return ""
}
return "0x" + n.Text(16)
}
func uintToHex(n uint64) string {
return "0x" + strconv.FormatUint(n, 16)
}
func addrToHex(a common.Address) string {
return strings.ToLower(a.Hex())
}

46
eth/tracers/native/noop.go Normal file
View File

@ -0,0 +1,46 @@
package native
import (
"encoding/json"
"math/big"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/tracers"
)
func init() {
tracers.RegisterNativeTracer("noopTracerNative", NewNoopTracer)
}
type noopTracer struct{}
func NewNoopTracer() tracers.Tracer {
return &noopTracer{}
}
func (t *noopTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
}
func (t *noopTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration, err error) {
}
func (t *noopTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
}
func (t *noopTracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, _ *vm.ScopeContext, depth int, err error) {
}
func (t *noopTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
}
func (t *noopTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
}
func (t *noopTracer) GetResult() (json.RawMessage, error) {
return json.RawMessage(`{}`), nil
}
func (t *noopTracer) Stop(err error) {
}

246
eth/tracers/testing/calltrace_test.go Normal file
View File

@ -0,0 +1,246 @@
package testing
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/eth/tracers"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/tests"
// Force-load the native, to trigger registration
_ "github.com/ethereum/go-ethereum/eth/tracers/native"
)
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 TestCallTracer(t *testing.T) {
testCallTracer("callTracer", "call_tracer", t)
}
func TestCallTracerNative(t *testing.T) {
testCallTracer("callTracerNative", "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)
}
}

32
eth/tracers/tracer.go
View File

@ -363,9 +363,9 @@ func (r *frameResult) pushObject(vm *duktape.Context) {
vm.PutPropString(obj, "getError")
}
// Tracer provides an implementation of Tracer that evaluates a Javascript
// jsTracer provides an implementation of Tracer that evaluates a Javascript
// function for each VM execution step.
type Tracer struct {
type jsTracer struct {
vm *duktape.Context // Javascript VM instance
tracerObject int // Stack index of the tracer JavaScript object
@ -409,12 +409,8 @@ type Context struct {
// New instantiates a new tracer instance. code specifies a Javascript snippet,
// which must evaluate to an expression returning an object with 'step', 'fault'
// and 'result' functions.
func New(code string, ctx *Context) (*Tracer, error) {
// Resolve any tracers by name and assemble the tracer object
if tracer, ok := tracer(code); ok {
code = tracer
}
tracer := &Tracer{
func newJsTracer(code string, ctx *Context) (*jsTracer, error) {
tracer := &jsTracer{
vm: duktape.New(),
ctx: make(map[string]interface{}),
opWrapper: new(opWrapper),
@ -620,14 +616,14 @@ func New(code string, ctx *Context) (*Tracer, error) {
}
// Stop terminates execution of the tracer at the first opportune moment.
func (jst *Tracer) Stop(err error) {
func (jst *jsTracer) Stop(err error) {
jst.reason = err
atomic.StoreUint32(&jst.interrupt, 1)
}
// call executes a method on a JS object, catching any errors, formatting and
// returning them as error objects.
func (jst *Tracer) call(noret bool, method string, args ...string) (json.RawMessage, error) {
func (jst *jsTracer) call(noret bool, method string, args ...string) (json.RawMessage, error) {
// Execute the JavaScript call and return any error
jst.vm.PushString(method)
for _, arg := range args {
@ -663,7 +659,7 @@ func wrapError(context string, err error) error {
}
// CaptureStart implements the Tracer interface to initialize the tracing operation.
func (jst *Tracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
func (jst *jsTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
jst.ctx["type"] = "CALL"
if create {
jst.ctx["type"] = "CREATE"
@ -693,7 +689,7 @@ func (jst *Tracer) CaptureStart(env *vm.EVM, from common.Address, to common.Addr
}
// CaptureState implements the Tracer interface to trace a single step of VM execution.
func (jst *Tracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
func (jst *jsTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
if !jst.traceSteps {
return
}
@ -729,7 +725,7 @@ func (jst *Tracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost
}
// CaptureFault implements the Tracer interface to trace an execution fault
func (jst *Tracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
func (jst *jsTracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
if jst.err != nil {
return
}
@ -743,7 +739,7 @@ func (jst *Tracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost
}
// CaptureEnd is called after the call finishes to finalize the tracing.
func (jst *Tracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
func (jst *jsTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
jst.ctx["output"] = output
jst.ctx["time"] = t.String()
jst.ctx["gasUsed"] = gasUsed
@ -754,7 +750,7 @@ func (jst *Tracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, er
}
// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
func (jst *Tracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
func (jst *jsTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
if !jst.traceCallFrames {
return
}
@ -784,7 +780,7 @@ func (jst *Tracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Ad
// CaptureExit is called when EVM exits a scope, even if the scope didn't
// execute any code.
func (jst *Tracer) CaptureExit(output []byte, gasUsed uint64, err error) {
func (jst *jsTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
if !jst.traceCallFrames {
return
}
@ -808,7 +804,7 @@ func (jst *Tracer) CaptureExit(output []byte, gasUsed uint64, err error) {
}
// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
func (jst *Tracer) GetResult() (json.RawMessage, error) {
func (jst *jsTracer) GetResult() (json.RawMessage, error) {
// Transform the context into a JavaScript object and inject into the state
obj := jst.vm.PushObject()
@ -830,7 +826,7 @@ func (jst *Tracer) GetResult() (json.RawMessage, error) {
}
// addToObj pushes a field to a JS object.
func (jst *Tracer) addToObj(obj int, key string, val interface{}) {
func (jst *jsTracer) addToObj(obj int, key string, val interface{}) {
pushValue(jst.vm, val)
jst.vm.PutPropString(obj, key)
}

4
eth/tracers/tracer_test.go
View File

@ -58,7 +58,7 @@ func testCtx() *vmContext {
return &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
}
func runTrace(tracer *Tracer, vmctx *vmContext, chaincfg *params.ChainConfig) (json.RawMessage, error) {
func runTrace(tracer Tracer, vmctx *vmContext, chaincfg *params.ChainConfig) (json.RawMessage, error) {
env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, chaincfg, vm.Config{Debug: true, Tracer: tracer})
var (
startGas uint64 = 10000
@ -168,7 +168,7 @@ func TestHaltBetweenSteps(t *testing.T) {
// TestNoStepExec tests a regular value transfer (no exec), and accessing the statedb
// in 'result'
func TestNoStepExec(t *testing.T) {
runEmptyTrace := func(tracer *Tracer, vmctx *vmContext) (json.RawMessage, error) {
runEmptyTrace := func(tracer Tracer, vmctx *vmContext) (json.RawMessage, error) {
env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
startGas := uint64(10000)
contract := vm.NewContract(account{}, account{}, big.NewInt(0), startGas)

53
eth/tracers/tracers.go
View File

@ -18,14 +18,53 @@
package tracers
import (
"encoding/json"
"strings"
"unicode"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/tracers/internal/tracers"
)
// all contains all the built in JavaScript tracers by name.
var all = make(map[string]string)
// Tracer interface extends vm.EVMLogger and additionally
// allows collecting the tracing result.
type Tracer interface {
vm.EVMLogger
GetResult() (json.RawMessage, error)
// Stop terminates execution of the tracer at the first opportune moment.
Stop(err error)
}
var (
nativeTracers map[string]func() Tracer = make(map[string]func() Tracer)
jsTracers = make(map[string]string)
)
// RegisterNativeTracer makes native tracers which adhere
// to the `Tracer` interface available to the rest of the codebase.
// It is typically invoked in the `init()` function, e.g. see the `native/call.go`.
func RegisterNativeTracer(name string, ctor func() Tracer) {
nativeTracers[name] = ctor
}
// New returns a new instance of a tracer,
// 1. If 'code' is the name of a registered native tracer, then that tracer
// is instantiated and returned
// 2. If 'code' is the name of a registered js-tracer, then that tracer is
// instantiated and returned
// 3. Otherwise, the code is interpreted as the js code of a js-tracer, and
// is evaluated and returned.
func New(code string, ctx *Context) (Tracer, error) {
// Resolve native tracer
if fn, ok := nativeTracers[code]; ok {
return fn(), nil
}
// Resolve js-tracers by name and assemble the tracer object
if tracer, ok := jsTracers[code]; ok {
code = tracer
}
return newJsTracer(code, ctx)
}
// camel converts a snake cased input string into a camel cased output.
func camel(str string) string {
@ -40,14 +79,6 @@ func camel(str string) string {
func init() {
for _, file := range tracers.AssetNames() {
name := camel(strings.TrimSuffix(file, ".js"))
all[name] = string(tracers.MustAsset(file))
jsTracers[name] = string(tracers.MustAsset(file))
}
}
// tracer retrieves a specific JavaScript tracer by name.
func tracer(name string) (string, bool) {
if tracer, ok := all[name]; ok {
return tracer, true
}
return "", false
}

181
eth/tracers/tracers_test.go
View File

@ -20,23 +20,18 @@ import (
"crypto/ecdsa"
"crypto/rand"
"encoding/json"
"io/ioutil"
"math/big"
"path/filepath"
"reflect"
"strings"
"testing"
"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/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/tests"
)
@ -104,22 +99,6 @@ type callTrace struct {
Calls []callTrace `json:"calls,omitempty"`
}
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"`
}
// 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"`
}
// 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
@ -280,96 +259,6 @@ func TestPrestateTracerCreate2(t *testing.T) {
}
}
// 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 testCallTracer(tracer 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()
// Call tracer test found, read if from disk
blob, err := ioutil.ReadFile(filepath.Join("testdata", dirPath, file.Name()))
if err != nil {
t.Fatalf("failed to read testcase: %v", err)
}
test := new(callTracerTest)
if err := json.Unmarshal(blob, test); err != nil {
t.Fatalf("failed to parse testcase: %v", err)
}
// Configure a blockchain with the given prestate
tx := new(types.Transaction)
if err := rlp.DecodeBytes(common.FromHex(test.Input), tx); err != nil {
t.Fatalf("failed to parse testcase input: %v", err)
}
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)
// Create the tracer, the EVM environment and run it
tracer, err := New(tracer, new(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)
}
})
}
}
func TestCallTracer(t *testing.T) {
testCallTracer("callTracer", "call_tracer", t)
}
// jsonEqual is similar to reflect.DeepEqual, but does a 'bounce' via json prior to
// comparison
func jsonEqual(x, y interface{}) bool {
@ -466,73 +355,3 @@ func BenchmarkTransactionTrace(b *testing.B) {
tracer.Reset()
}
}
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("callTracer", 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)
// Create the tracer, the EVM environment and run it
tracer, err := New(tracerName, new(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})
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
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)
}
statedb.RevertToSnapshot(snap)
}
}