Official Go implementation of the Ethereum protocol
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go-ethereum/eth/tracers/js/goja.go

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25 KiB

// Copyright 2022 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 js
import (
"encoding/json"
"errors"
"fmt"
"math/big"
"github.com/dop251/goja"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth/tracers"
jsassets "github.com/ethereum/go-ethereum/eth/tracers/js/internal/tracers"
)
var assetTracers = make(map[string]string)
// init retrieves the JavaScript transaction tracers included in go-ethereum.
func init() {
var err error
assetTracers, err = jsassets.Load()
if err != nil {
panic(err)
}
type ctorFn = func(*tracers.Context, json.RawMessage) (tracers.Tracer, error)
lookup := func(code string) ctorFn {
return func(ctx *tracers.Context, cfg json.RawMessage) (tracers.Tracer, error) {
return newJsTracer(code, ctx, cfg)
}
}
for name, code := range assetTracers {
tracers.DefaultDirectory.Register(name, lookup(code), true)
}
tracers.DefaultDirectory.RegisterJSEval(newJsTracer)
}
// bigIntProgram is compiled once and the exported function mostly invoked to convert
// hex strings into big ints.
var bigIntProgram = goja.MustCompile("bigInt", bigIntegerJS, false)
type toBigFn = func(vm *goja.Runtime, val string) (goja.Value, error)
type toBufFn = func(vm *goja.Runtime, val []byte) (goja.Value, error)
type fromBufFn = func(vm *goja.Runtime, buf goja.Value, allowString bool) ([]byte, error)
func toBuf(vm *goja.Runtime, bufType goja.Value, val []byte) (goja.Value, error) {
// bufType is usually Uint8Array. This is equivalent to `new Uint8Array(val)` in JS.
return vm.New(bufType, vm.ToValue(vm.NewArrayBuffer(val)))
}
func fromBuf(vm *goja.Runtime, bufType goja.Value, buf goja.Value, allowString bool) ([]byte, error) {
obj := buf.ToObject(vm)
switch obj.ClassName() {
case "String":
if !allowString {
break
}
return common.FromHex(obj.String()), nil
case "Array":
var b []byte
if err := vm.ExportTo(buf, &b); err != nil {
return nil, err
}
return b, nil
case "Object":
if !obj.Get("constructor").SameAs(bufType) {
break
}
b := obj.Export().([]byte)
return b, nil
}
return nil, errors.New("invalid buffer type")
}
// jsTracer is an implementation of the Tracer interface which evaluates
// JS functions on the relevant EVM hooks. It uses Goja as its JS engine.
type jsTracer struct {
vm *goja.Runtime
env *vm.EVM
toBig toBigFn // Converts a hex string into a JS bigint
toBuf toBufFn // Converts a []byte into a JS buffer
fromBuf fromBufFn // Converts an array, hex string or Uint8Array to a []byte
ctx map[string]goja.Value // KV-bag passed to JS in `result`
activePrecompiles []common.Address // List of active precompiles at current block
traceStep bool // True if tracer object exposes a `step()` method
traceFrame bool // True if tracer object exposes the `enter()` and `exit()` methods
gasLimit uint64 // Amount of gas bought for the whole tx
err error // Any error that should stop tracing
obj *goja.Object // Trace object
// Methods exposed by tracer
result goja.Callable
fault goja.Callable
step goja.Callable
enter goja.Callable
exit goja.Callable
// Underlying structs being passed into JS
log *steplog
frame *callframe
frameResult *callframeResult
// Goja-wrapping of types prepared for JS consumption
logValue goja.Value
dbValue goja.Value
frameValue goja.Value
frameResultValue goja.Value
}
// newJsTracer instantiates a new JS tracer instance. code is a
// Javascript snippet which evaluates to an expression returning
// an object with certain methods:
//
// The methods `result` and `fault` are required to be present.
// The methods `step`, `enter`, and `exit` are optional, but note that
// `enter` and `exit` always go together.
func newJsTracer(code string, ctx *tracers.Context, cfg json.RawMessage) (tracers.Tracer, error) {
vm := goja.New()
// By default field names are exported to JS as is, i.e. capitalized.
vm.SetFieldNameMapper(goja.UncapFieldNameMapper())
t := &jsTracer{
vm: vm,
ctx: make(map[string]goja.Value),
}
t.setTypeConverters()
t.setBuiltinFunctions()
if ctx == nil {
ctx = new(tracers.Context)
}
if ctx.BlockHash != (common.Hash{}) {
blockHash, err := t.toBuf(vm, ctx.BlockHash.Bytes())
if err != nil {
return nil, err
}
t.ctx["blockHash"] = blockHash
if ctx.TxHash != (common.Hash{}) {
t.ctx["txIndex"] = vm.ToValue(ctx.TxIndex)
txHash, err := t.toBuf(vm, ctx.TxHash.Bytes())
if err != nil {
return nil, err
}
t.ctx["txHash"] = txHash
}
}
ret, err := vm.RunString("(" + code + ")")
if err != nil {
return nil, err
}
// Check tracer's interface for required and optional methods.
obj := ret.ToObject(vm)
result, ok := goja.AssertFunction(obj.Get("result"))
if !ok {
return nil, errors.New("trace object must expose a function result()")
}
fault, ok := goja.AssertFunction(obj.Get("fault"))
if !ok {
return nil, errors.New("trace object must expose a function fault()")
}
step, ok := goja.AssertFunction(obj.Get("step"))
t.traceStep = ok
enter, hasEnter := goja.AssertFunction(obj.Get("enter"))
exit, hasExit := goja.AssertFunction(obj.Get("exit"))
if hasEnter != hasExit {
return nil, errors.New("trace object must expose either both or none of enter() and exit()")
}
t.traceFrame = hasEnter
t.obj = obj
t.step = step
t.enter = enter
t.exit = exit
t.result = result
t.fault = fault
// Pass in config
if setup, ok := goja.AssertFunction(obj.Get("setup")); ok {
cfgStr := "{}"
if cfg != nil {
cfgStr = string(cfg)
}
if _, err := setup(obj, vm.ToValue(cfgStr)); err != nil {
return nil, err
}
}
// Setup objects carrying data to JS. These are created once and re-used.
t.log = &steplog{
vm: vm,
op: &opObj{vm: vm},
memory: &memoryObj{vm: vm, toBig: t.toBig, toBuf: t.toBuf},
stack: &stackObj{vm: vm, toBig: t.toBig},
contract: &contractObj{vm: vm, toBig: t.toBig, toBuf: t.toBuf},
}
t.frame = &callframe{vm: vm, toBig: t.toBig, toBuf: t.toBuf}
t.frameResult = &callframeResult{vm: vm, toBuf: t.toBuf}
t.frameValue = t.frame.setupObject()
t.frameResultValue = t.frameResult.setupObject()
t.logValue = t.log.setupObject()
return t, nil
}
// CaptureTxStart implements the Tracer interface and is invoked at the beginning of
// transaction processing.
func (t *jsTracer) CaptureTxStart(gasLimit uint64) {
t.gasLimit = gasLimit
}
// CaptureTxEnd implements the Tracer interface and is invoked at the end of
// transaction processing.
func (t *jsTracer) CaptureTxEnd(restGas uint64) {
t.ctx["gasUsed"] = t.vm.ToValue(t.gasLimit - restGas)
}
// CaptureStart implements the Tracer interface to initialize the tracing operation.
func (t *jsTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
cancel := func(err error) {
t.err = err
t.env.Cancel()
}
t.env = env
db := &dbObj{db: env.StateDB, vm: t.vm, toBig: t.toBig, toBuf: t.toBuf, fromBuf: t.fromBuf}
t.dbValue = db.setupObject()
if create {
t.ctx["type"] = t.vm.ToValue("CREATE")
} else {
t.ctx["type"] = t.vm.ToValue("CALL")
}
fromVal, err := t.toBuf(t.vm, from.Bytes())
if err != nil {
cancel(err)
return
}
t.ctx["from"] = fromVal
toVal, err := t.toBuf(t.vm, to.Bytes())
if err != nil {
cancel(err)
return
}
t.ctx["to"] = toVal
inputVal, err := t.toBuf(t.vm, input)
if err != nil {
cancel(err)
return
}
t.ctx["input"] = inputVal
t.ctx["gas"] = t.vm.ToValue(t.gasLimit)
gasPriceBig, err := t.toBig(t.vm, env.TxContext.GasPrice.String())
if err != nil {
cancel(err)
return
}
t.ctx["gasPrice"] = gasPriceBig
valueBig, err := t.toBig(t.vm, value.String())
if err != nil {
cancel(err)
return
}
t.ctx["value"] = valueBig
t.ctx["block"] = t.vm.ToValue(env.Context.BlockNumber.Uint64())
// Update list of precompiles based on current block
rules := env.ChainConfig().Rules(env.Context.BlockNumber, env.Context.Random != nil, env.Context.Time)
t.activePrecompiles = vm.ActivePrecompiles(rules)
}
// CaptureState implements the Tracer interface to trace a single step of VM execution.
func (t *jsTracer) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
if !t.traceStep {
return
}
if t.err != nil {
return
}
log := t.log
log.op.op = op
log.memory.memory = scope.Memory
log.stack.stack = scope.Stack
log.contract.contract = scope.Contract
log.pc = pc
log.gas = gas
log.cost = cost
log.refund = t.env.StateDB.GetRefund()
log.depth = depth
log.err = err
if _, err := t.step(t.obj, t.logValue, t.dbValue); err != nil {
t.onError("step", err)
}
}
// CaptureFault implements the Tracer interface to trace an execution fault
func (t *jsTracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
if t.err != nil {
return
}
// Other log fields have been already set as part of the last CaptureState.
t.log.err = err
if _, err := t.fault(t.obj, t.logValue, t.dbValue); err != nil {
t.onError("fault", err)
}
}
// CaptureEnd is called after the call finishes to finalize the tracing.
func (t *jsTracer) CaptureEnd(output []byte, gasUsed uint64, err error) {
if err != nil {
t.ctx["error"] = t.vm.ToValue(err.Error())
}
outputVal, err := t.toBuf(t.vm, output)
if err != nil {
t.err = err
return
}
t.ctx["output"] = outputVal
}
// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
func (t *jsTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
if !t.traceFrame {
return
}
if t.err != nil {
return
}
t.frame.typ = typ.String()
t.frame.from = from
t.frame.to = to
t.frame.input = common.CopyBytes(input)
t.frame.gas = uint(gas)
t.frame.value = nil
if value != nil {
t.frame.value = new(big.Int).SetBytes(value.Bytes())
}
if _, err := t.enter(t.obj, t.frameValue); err != nil {
t.onError("enter", err)
}
}
// CaptureExit is called when EVM exits a scope, even if the scope didn't
// execute any code.
func (t *jsTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
if !t.traceFrame {
return
}
t.frameResult.gasUsed = uint(gasUsed)
t.frameResult.output = common.CopyBytes(output)
t.frameResult.err = err
if _, err := t.exit(t.obj, t.frameResultValue); err != nil {
t.onError("exit", err)
}
}
// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
func (t *jsTracer) GetResult() (json.RawMessage, error) {
ctx := t.vm.ToValue(t.ctx)
res, err := t.result(t.obj, ctx, t.dbValue)
if err != nil {
return nil, wrapError("result", err)
}
encoded, err := json.Marshal(res)
if err != nil {
return nil, err
}
return json.RawMessage(encoded), t.err
}
// Stop terminates execution of the tracer at the first opportune moment.
func (t *jsTracer) Stop(err error) {
t.vm.Interrupt(err)
}
// onError is called anytime the running JS code is interrupted
// and returns an error. It in turn pings the EVM to cancel its
// execution.
func (t *jsTracer) onError(context string, err error) {
t.err = wrapError(context, err)
// `env` is set on CaptureStart which comes before any JS execution.
// So it should be non-nil.
t.env.Cancel()
}
func wrapError(context string, err error) error {
return fmt.Errorf("%v in server-side tracer function '%v'", err, context)
}
// setBuiltinFunctions injects Go functions which are available to tracers into the environment.
// It depends on type converters having been set up.
func (t *jsTracer) setBuiltinFunctions() {
vm := t.vm
// TODO: load console from goja-nodejs
vm.Set("toHex", func(v goja.Value) string {
b, err := t.fromBuf(vm, v, false)
if err != nil {
vm.Interrupt(err)
return ""
}
return hexutil.Encode(b)
})
vm.Set("toWord", func(v goja.Value) goja.Value {
// TODO: add test with []byte len < 32 or > 32
b, err := t.fromBuf(vm, v, true)
if err != nil {
vm.Interrupt(err)
return nil
}
b = common.BytesToHash(b).Bytes()
res, err := t.toBuf(vm, b)
if err != nil {
vm.Interrupt(err)
return nil
}
return res
})
vm.Set("toAddress", func(v goja.Value) goja.Value {
a, err := t.fromBuf(vm, v, true)
if err != nil {
vm.Interrupt(err)
return nil
}
a = common.BytesToAddress(a).Bytes()
res, err := t.toBuf(vm, a)
if err != nil {
vm.Interrupt(err)
return nil
}
return res
})
vm.Set("toContract", func(from goja.Value, nonce uint) goja.Value {
a, err := t.fromBuf(vm, from, true)
if err != nil {
vm.Interrupt(err)
return nil
}
addr := common.BytesToAddress(a)
b := crypto.CreateAddress(addr, uint64(nonce)).Bytes()
res, err := t.toBuf(vm, b)
if err != nil {
vm.Interrupt(err)
return nil
}
return res
})
vm.Set("toContract2", func(from goja.Value, salt string, initcode goja.Value) goja.Value {
a, err := t.fromBuf(vm, from, true)
if err != nil {
vm.Interrupt(err)
return nil
}
addr := common.BytesToAddress(a)
code, err := t.fromBuf(vm, initcode, true)
if err != nil {
vm.Interrupt(err)
return nil
}
code = common.CopyBytes(code)
codeHash := crypto.Keccak256(code)
b := crypto.CreateAddress2(addr, common.HexToHash(salt), codeHash).Bytes()
res, err := t.toBuf(vm, b)
if err != nil {
vm.Interrupt(err)
return nil
}
return res
})
vm.Set("isPrecompiled", func(v goja.Value) bool {
a, err := t.fromBuf(vm, v, true)
if err != nil {
vm.Interrupt(err)
return false
}
addr := common.BytesToAddress(a)
for _, p := range t.activePrecompiles {
if p == addr {
return true
}
}
return false
})
vm.Set("slice", func(slice goja.Value, start, end int64) goja.Value {
b, err := t.fromBuf(vm, slice, false)
if err != nil {
vm.Interrupt(err)
return nil
}
if start < 0 || start > end || end > int64(len(b)) {
vm.Interrupt(fmt.Sprintf("Tracer accessed out of bound memory: available %d, offset %d, size %d", len(b), start, end-start))
return nil
}
res, err := t.toBuf(vm, b[start:end])
if err != nil {
vm.Interrupt(err)
return nil
}
return res
})
}
// setTypeConverters sets up utilities for converting Go types into those
// suitable for JS consumption.
func (t *jsTracer) setTypeConverters() error {
// Inject bigint logic.
// TODO: To be replaced after goja adds support for native JS bigint.
toBigCode, err := t.vm.RunProgram(bigIntProgram)
if err != nil {
return err
}
// Used to create JS bigint objects from go.
toBigFn, ok := goja.AssertFunction(toBigCode)
if !ok {
return errors.New("failed to bind bigInt func")
}
toBigWrapper := func(vm *goja.Runtime, val string) (goja.Value, error) {
return toBigFn(goja.Undefined(), vm.ToValue(val))
}
t.toBig = toBigWrapper
// NOTE: We need this workaround to create JS buffers because
// goja doesn't at the moment expose constructors for typed arrays.
//
// Cache uint8ArrayType once to be used every time for less overhead.
uint8ArrayType := t.vm.Get("Uint8Array")
toBufWrapper := func(vm *goja.Runtime, val []byte) (goja.Value, error) {
return toBuf(vm, uint8ArrayType, val)
}
t.toBuf = toBufWrapper
fromBufWrapper := func(vm *goja.Runtime, buf goja.Value, allowString bool) ([]byte, error) {
return fromBuf(vm, uint8ArrayType, buf, allowString)
}
t.fromBuf = fromBufWrapper
return nil
}
type opObj struct {
vm *goja.Runtime
op vm.OpCode
}
func (o *opObj) ToNumber() int {
return int(o.op)
}
func (o *opObj) ToString() string {
return o.op.String()
}
func (o *opObj) IsPush() bool {
return o.op.IsPush()
}
func (o *opObj) setupObject() *goja.Object {
obj := o.vm.NewObject()
obj.Set("toNumber", o.vm.ToValue(o.ToNumber))
obj.Set("toString", o.vm.ToValue(o.ToString))
obj.Set("isPush", o.vm.ToValue(o.IsPush))
return obj
}
type memoryObj struct {
memory *vm.Memory
vm *goja.Runtime
toBig toBigFn
toBuf toBufFn
}
func (mo *memoryObj) Slice(begin, end int64) goja.Value {
b, err := mo.slice(begin, end)
if err != nil {
mo.vm.Interrupt(err)
return nil
}
res, err := mo.toBuf(mo.vm, b)
if err != nil {
mo.vm.Interrupt(err)
return nil
}
return res
}
// slice returns the requested range of memory as a byte slice.
func (mo *memoryObj) slice(begin, end int64) ([]byte, error) {
if end == begin {
return []byte{}, nil
}
if end < begin || begin < 0 {
return nil, fmt.Errorf("tracer accessed out of bound memory: offset %d, end %d", begin, end)
}
slice, err := tracers.GetMemoryCopyPadded(mo.memory, begin, end-begin)
if err != nil {
return nil, err
}
return slice, nil
}
func (mo *memoryObj) GetUint(addr int64) goja.Value {
value, err := mo.getUint(addr)
if err != nil {
mo.vm.Interrupt(err)
return nil
}
res, err := mo.toBig(mo.vm, value.String())
if err != nil {
mo.vm.Interrupt(err)
return nil
}
return res
}
// getUint returns the 32 bytes at the specified address interpreted as a uint.
func (mo *memoryObj) getUint(addr int64) (*big.Int, error) {
if mo.memory.Len() < int(addr)+32 || addr < 0 {
return nil, fmt.Errorf("tracer accessed out of bound memory: available %d, offset %d, size %d", mo.memory.Len(), addr, 32)
}
return new(big.Int).SetBytes(mo.memory.GetPtr(addr, 32)), nil
}
func (mo *memoryObj) Length() int {
return mo.memory.Len()
}
func (m *memoryObj) setupObject() *goja.Object {
o := m.vm.NewObject()
o.Set("slice", m.vm.ToValue(m.Slice))
o.Set("getUint", m.vm.ToValue(m.GetUint))
o.Set("length", m.vm.ToValue(m.Length))
return o
}
type stackObj struct {
stack *vm.Stack
vm *goja.Runtime
toBig toBigFn
}
func (s *stackObj) Peek(idx int) goja.Value {
value, err := s.peek(idx)
if err != nil {
s.vm.Interrupt(err)
return nil
}
res, err := s.toBig(s.vm, value.String())
if err != nil {
s.vm.Interrupt(err)
return nil
}
return res
}
// peek returns the nth-from-the-top element of the stack.
func (s *stackObj) peek(idx int) (*big.Int, error) {
if len(s.stack.Data()) <= idx || idx < 0 {
return nil, fmt.Errorf("tracer accessed out of bound stack: size %d, index %d", len(s.stack.Data()), idx)
}
return s.stack.Back(idx).ToBig(), nil
}
func (s *stackObj) Length() int {
return len(s.stack.Data())
}
func (s *stackObj) setupObject() *goja.Object {
o := s.vm.NewObject()
o.Set("peek", s.vm.ToValue(s.Peek))
o.Set("length", s.vm.ToValue(s.Length))
return o
}
type dbObj struct {
db vm.StateDB
vm *goja.Runtime
toBig toBigFn
toBuf toBufFn
fromBuf fromBufFn
}
func (do *dbObj) GetBalance(addrSlice goja.Value) goja.Value {
a, err := do.fromBuf(do.vm, addrSlice, false)
if err != nil {
do.vm.Interrupt(err)
return nil
}
addr := common.BytesToAddress(a)
value := do.db.GetBalance(addr)
res, err := do.toBig(do.vm, value.String())
if err != nil {
do.vm.Interrupt(err)
return nil
}
return res
}
func (do *dbObj) GetNonce(addrSlice goja.Value) uint64 {
a, err := do.fromBuf(do.vm, addrSlice, false)
if err != nil {
do.vm.Interrupt(err)
return 0
}
addr := common.BytesToAddress(a)
return do.db.GetNonce(addr)
}
func (do *dbObj) GetCode(addrSlice goja.Value) goja.Value {
a, err := do.fromBuf(do.vm, addrSlice, false)
if err != nil {
do.vm.Interrupt(err)
return nil
}
addr := common.BytesToAddress(a)
code := do.db.GetCode(addr)
res, err := do.toBuf(do.vm, code)
if err != nil {
do.vm.Interrupt(err)
return nil
}
return res
}
func (do *dbObj) GetState(addrSlice goja.Value, hashSlice goja.Value) goja.Value {
a, err := do.fromBuf(do.vm, addrSlice, false)
if err != nil {
do.vm.Interrupt(err)
return nil
}
addr := common.BytesToAddress(a)
h, err := do.fromBuf(do.vm, hashSlice, false)
if err != nil {
do.vm.Interrupt(err)
return nil
}
hash := common.BytesToHash(h)
state := do.db.GetState(addr, hash).Bytes()
res, err := do.toBuf(do.vm, state)
if err != nil {
do.vm.Interrupt(err)
return nil
}
return res
}
func (do *dbObj) Exists(addrSlice goja.Value) bool {
a, err := do.fromBuf(do.vm, addrSlice, false)
if err != nil {
do.vm.Interrupt(err)
return false
}
addr := common.BytesToAddress(a)
return do.db.Exist(addr)
}
func (do *dbObj) setupObject() *goja.Object {
o := do.vm.NewObject()
o.Set("getBalance", do.vm.ToValue(do.GetBalance))
o.Set("getNonce", do.vm.ToValue(do.GetNonce))
o.Set("getCode", do.vm.ToValue(do.GetCode))
o.Set("getState", do.vm.ToValue(do.GetState))
o.Set("exists", do.vm.ToValue(do.Exists))
return o
}
type contractObj struct {
contract *vm.Contract
vm *goja.Runtime
toBig toBigFn
toBuf toBufFn
}
func (co *contractObj) GetCaller() goja.Value {
caller := co.contract.Caller().Bytes()
res, err := co.toBuf(co.vm, caller)
if err != nil {
co.vm.Interrupt(err)
return nil
}
return res
}
func (co *contractObj) GetAddress() goja.Value {
addr := co.contract.Address().Bytes()
res, err := co.toBuf(co.vm, addr)
if err != nil {
co.vm.Interrupt(err)
return nil
}
return res
}
func (co *contractObj) GetValue() goja.Value {
value := co.contract.Value()
res, err := co.toBig(co.vm, value.String())
if err != nil {
co.vm.Interrupt(err)
return nil
}
return res
}
func (co *contractObj) GetInput() goja.Value {
input := common.CopyBytes(co.contract.Input)
res, err := co.toBuf(co.vm, input)
if err != nil {
co.vm.Interrupt(err)
return nil
}
return res
}
func (c *contractObj) setupObject() *goja.Object {
o := c.vm.NewObject()
o.Set("getCaller", c.vm.ToValue(c.GetCaller))
o.Set("getAddress", c.vm.ToValue(c.GetAddress))
o.Set("getValue", c.vm.ToValue(c.GetValue))
o.Set("getInput", c.vm.ToValue(c.GetInput))
return o
}
type callframe struct {
vm *goja.Runtime
toBig toBigFn
toBuf toBufFn
typ string
from common.Address
to common.Address
input []byte
gas uint
value *big.Int
}
func (f *callframe) GetType() string {
return f.typ
}
func (f *callframe) GetFrom() goja.Value {
from := f.from.Bytes()
res, err := f.toBuf(f.vm, from)
if err != nil {
f.vm.Interrupt(err)
return nil
}
return res
}
func (f *callframe) GetTo() goja.Value {
to := f.to.Bytes()
res, err := f.toBuf(f.vm, to)
if err != nil {
f.vm.Interrupt(err)
return nil
}
return res
}
func (f *callframe) GetInput() goja.Value {
input := f.input
res, err := f.toBuf(f.vm, input)
if err != nil {
f.vm.Interrupt(err)
return nil
}
return res
}
func (f *callframe) GetGas() uint {
return f.gas
}
func (f *callframe) GetValue() goja.Value {
if f.value == nil {
return goja.Undefined()
}
res, err := f.toBig(f.vm, f.value.String())
if err != nil {
f.vm.Interrupt(err)
return nil
}
return res
}
func (f *callframe) setupObject() *goja.Object {
o := f.vm.NewObject()
o.Set("getType", f.vm.ToValue(f.GetType))
o.Set("getFrom", f.vm.ToValue(f.GetFrom))
o.Set("getTo", f.vm.ToValue(f.GetTo))
o.Set("getInput", f.vm.ToValue(f.GetInput))
o.Set("getGas", f.vm.ToValue(f.GetGas))
o.Set("getValue", f.vm.ToValue(f.GetValue))
return o
}
type callframeResult struct {
vm *goja.Runtime
toBuf toBufFn
gasUsed uint
output []byte
err error
}
func (r *callframeResult) GetGasUsed() uint {
return r.gasUsed
}
func (r *callframeResult) GetOutput() goja.Value {
res, err := r.toBuf(r.vm, r.output)
if err != nil {
r.vm.Interrupt(err)
return nil
}
return res
}
func (r *callframeResult) GetError() goja.Value {
if r.err != nil {
return r.vm.ToValue(r.err.Error())
}
return goja.Undefined()
}
func (r *callframeResult) setupObject() *goja.Object {
o := r.vm.NewObject()
o.Set("getGasUsed", r.vm.ToValue(r.GetGasUsed))
o.Set("getOutput", r.vm.ToValue(r.GetOutput))
o.Set("getError", r.vm.ToValue(r.GetError))
return o
}
type steplog struct {
vm *goja.Runtime
op *opObj
memory *memoryObj
stack *stackObj
contract *contractObj
pc uint64
gas uint64
cost uint64
depth int
refund uint64
err error
}
func (l *steplog) GetPC() uint64 { return l.pc }
func (l *steplog) GetGas() uint64 { return l.gas }
func (l *steplog) GetCost() uint64 { return l.cost }
func (l *steplog) GetDepth() int { return l.depth }
func (l *steplog) GetRefund() uint64 { return l.refund }
func (l *steplog) GetError() goja.Value {
if l.err != nil {
return l.vm.ToValue(l.err.Error())
}
return goja.Undefined()
}
func (l *steplog) setupObject() *goja.Object {
o := l.vm.NewObject()
// Setup basic fields.
o.Set("getPC", l.vm.ToValue(l.GetPC))
o.Set("getGas", l.vm.ToValue(l.GetGas))
o.Set("getCost", l.vm.ToValue(l.GetCost))
o.Set("getDepth", l.vm.ToValue(l.GetDepth))
o.Set("getRefund", l.vm.ToValue(l.GetRefund))
o.Set("getError", l.vm.ToValue(l.GetError))
// Setup nested objects.
o.Set("op", l.op.setupObject())
o.Set("stack", l.stack.setupObject())
o.Set("memory", l.memory.setupObject())
o.Set("contract", l.contract.setupObject())
return o
}