diff --git a/cmd/evm/internal/t8ntool/execution.go b/cmd/evm/internal/t8ntool/execution.go index fae65767b..cedf96627 100644 --- a/cmd/evm/internal/t8ntool/execution.go +++ b/cmd/evm/internal/t8ntool/execution.go @@ -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 diff --git a/cmd/evm/internal/t8ntool/transition.go b/cmd/evm/internal/t8ntool/transition.go index 88a9c5e62..0aff715eb 100644 --- a/cmd/evm/internal/t8ntool/transition.go +++ b/cmd/evm/internal/t8ntool/transition.go @@ -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 } } diff --git a/cmd/evm/runner.go b/cmd/evm/runner.go index cedbd2281..447bb2c2e 100644 --- a/cmd/evm/runner.go +++ b/cmd/evm/runner.go @@ -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 diff --git a/cmd/evm/staterunner.go b/cmd/evm/staterunner.go index ab2704609..5e9bf696b 100644 --- a/cmd/evm/staterunner.go +++ b/cmd/evm/staterunner.go @@ -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 { diff --git a/cmd/geth/main.go b/cmd/geth/main.go index 9d80ce0be..5e6c77548 100644 --- a/cmd/geth/main.go +++ b/cmd/geth/main.go @@ -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" ) diff --git a/core/vm/interpreter.go b/core/vm/interpreter.go index 9fb83799c..92d33388f 100644 --- a/core/vm/interpreter.go +++ b/core/vm/interpreter.go @@ -27,11 +27,11 @@ import ( // Config are the configuration options for the Interpreter type Config struct { - Debug bool // Enables debugging - Tracer Tracer // 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 + Debug bool // Enables debugging + 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 JumpTable [256]*operation // EVM instruction table, automatically populated if unset @@ -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, diff --git a/core/vm/logger.go b/core/vm/logger.go index 52dc0b8a0..048b84ff6 100644 --- a/core/vm/logger.go +++ b/core/vm/logger.go @@ -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) { } diff --git a/eth/tracers/api.go b/eth/tracers/api.go index 9bd7d9e6d..f8d61fa06 100644 --- a/eth/tracers/api.go +++ b/eth/tracers/api.go @@ -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 + } else { + deadlineCtx, cancel := context.WithTimeout(ctx, timeout) + go func() { + <-deadlineCtx.Done() + if errors.Is(deadlineCtx.Err(), context.DeadlineExceeded) { + t.Stop(errors.New("execution timeout")) + } + }() + defer cancel() + tracer = t } - // Handle timeouts and RPC cancellations - deadlineCtx, cancel := context.WithTimeout(ctx, timeout) - go func() { - <-deadlineCtx.Done() - if deadlineCtx.Err() == context.DeadlineExceeded { - tracer.(*Tracer).Stop(errors.New("execution timeout")) - } - }() - defer cancel() - - case config == nil: - tracer = vm.NewStructLogger(nil) - 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: diff --git a/eth/tracers/native/call.go b/eth/tracers/native/call.go new file mode 100644 index 000000000..a7ca57566 --- /dev/null +++ b/eth/tracers/native/call.go @@ -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 . + +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()) +} diff --git a/eth/tracers/native/noop.go b/eth/tracers/native/noop.go new file mode 100644 index 000000000..554bb18f1 --- /dev/null +++ b/eth/tracers/native/noop.go @@ -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) { +} diff --git a/eth/tracers/testing/calltrace_test.go b/eth/tracers/testing/calltrace_test.go new file mode 100644 index 000000000..3423e7a58 --- /dev/null +++ b/eth/tracers/testing/calltrace_test.go @@ -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) + } +} diff --git a/eth/tracers/tracer.go b/eth/tracers/tracer.go index 2d681d964..4fee7ed96 100644 --- a/eth/tracers/tracer.go +++ b/eth/tracers/tracer.go @@ -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) } diff --git a/eth/tracers/tracer_test.go b/eth/tracers/tracer_test.go index 63b09bdc6..0e78f34b6 100644 --- a/eth/tracers/tracer_test.go +++ b/eth/tracers/tracer_test.go @@ -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) diff --git a/eth/tracers/tracers.go b/eth/tracers/tracers.go index 4e1ef23ad..79534c636 100644 --- a/eth/tracers/tracers.go +++ b/eth/tracers/tracers.go @@ -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 -} diff --git a/eth/tracers/tracers_test.go b/eth/tracers/tracers_test.go index f2333b87b..ba445fd5a 100644 --- a/eth/tracers/tracers_test.go +++ b/eth/tracers/tracers_test.go @@ -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) - } -}