Official Go implementation of the Ethereum protocol
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go-ethereum/cmd/evm/internal/t8ntool/transition.go

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// Copyright 2020 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package t8ntool
import (
"crypto/ecdsa"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"math/big"
"os"
"path"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth/tracers/logger"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/tests"
"gopkg.in/urfave/cli.v1"
)
const (
ErrorEVM = 2
ErrorConfig = 3
ErrorMissingBlockhash = 4
ErrorJson = 10
ErrorIO = 11
ErrorRlp = 12
stdinSelector = "stdin"
)
type NumberedError struct {
errorCode int
err error
}
func NewError(errorCode int, err error) *NumberedError {
return &NumberedError{errorCode, err}
}
func (n *NumberedError) Error() string {
return fmt.Sprintf("ERROR(%d): %v", n.errorCode, n.err.Error())
}
func (n *NumberedError) ExitCode() int {
return n.errorCode
}
// compile-time conformance test
var (
_ cli.ExitCoder = (*NumberedError)(nil)
)
type input struct {
Alloc core.GenesisAlloc `json:"alloc,omitempty"`
Env *stEnv `json:"env,omitempty"`
Txs []*txWithKey `json:"txs,omitempty"`
TxRlp string `json:"txsRlp,omitempty"`
}
func Transition(ctx *cli.Context) error {
// Configure the go-ethereum logger
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
log.Root().SetHandler(glogger)
var (
err error
tracer vm.EVMLogger
)
var getTracer func(txIndex int, txHash common.Hash) (vm.EVMLogger, error)
baseDir, err := createBasedir(ctx)
if err != nil {
return NewError(ErrorIO, fmt.Errorf("failed creating output basedir: %v", err))
}
if ctx.Bool(TraceFlag.Name) {
if ctx.IsSet(TraceDisableMemoryFlag.Name) && ctx.IsSet(TraceEnableMemoryFlag.Name) {
return NewError(ErrorConfig, fmt.Errorf("can't use both flags --%s and --%s", TraceDisableMemoryFlag.Name, TraceEnableMemoryFlag.Name))
}
if ctx.IsSet(TraceDisableReturnDataFlag.Name) && ctx.IsSet(TraceEnableReturnDataFlag.Name) {
return NewError(ErrorConfig, fmt.Errorf("can't use both flags --%s and --%s", TraceDisableReturnDataFlag.Name, TraceEnableReturnDataFlag.Name))
}
if ctx.IsSet(TraceDisableMemoryFlag.Name) {
log.Warn(fmt.Sprintf("--%s has been deprecated in favour of --%s", TraceDisableMemoryFlag.Name, TraceEnableMemoryFlag.Name))
}
if ctx.IsSet(TraceDisableReturnDataFlag.Name) {
log.Warn(fmt.Sprintf("--%s has been deprecated in favour of --%s", TraceDisableReturnDataFlag.Name, TraceEnableReturnDataFlag.Name))
}
// Configure the EVM logger
logConfig := &logger.Config{
DisableStack: ctx.Bool(TraceDisableStackFlag.Name),
EnableMemory: !ctx.Bool(TraceDisableMemoryFlag.Name) || ctx.Bool(TraceEnableMemoryFlag.Name),
EnableReturnData: !ctx.Bool(TraceDisableReturnDataFlag.Name) || ctx.Bool(TraceEnableReturnDataFlag.Name),
Debug: true,
}
var prevFile *os.File
// This one closes the last file
defer func() {
if prevFile != nil {
prevFile.Close()
}
}()
getTracer = func(txIndex int, txHash common.Hash) (vm.EVMLogger, error) {
if prevFile != nil {
prevFile.Close()
}
traceFile, err := os.Create(path.Join(baseDir, fmt.Sprintf("trace-%d-%v.jsonl", txIndex, txHash.String())))
if err != nil {
return nil, NewError(ErrorIO, fmt.Errorf("failed creating trace-file: %v", err))
}
prevFile = traceFile
return logger.NewJSONLogger(logConfig, traceFile), nil
}
} else {
getTracer = func(txIndex int, txHash common.Hash) (tracer vm.EVMLogger, err error) {
return nil, nil
}
}
// We need to load three things: alloc, env and transactions. May be either in
// stdin input or in files.
// Check if anything needs to be read from stdin
var (
prestate Prestate
txs types.Transactions // txs to apply
allocStr = ctx.String(InputAllocFlag.Name)
envStr = ctx.String(InputEnvFlag.Name)
txStr = ctx.String(InputTxsFlag.Name)
inputData = &input{}
)
// Figure out the prestate alloc
if allocStr == stdinSelector || envStr == stdinSelector || txStr == stdinSelector {
decoder := json.NewDecoder(os.Stdin)
if err := decoder.Decode(inputData); err != nil {
return NewError(ErrorJson, fmt.Errorf("failed unmarshaling stdin: %v", err))
}
}
if allocStr != stdinSelector {
if err := readFile(allocStr, "alloc", &inputData.Alloc); err != nil {
return err
}
}
prestate.Pre = inputData.Alloc
// Set the block environment
if envStr != stdinSelector {
var env stEnv
if err := readFile(envStr, "env", &env); err != nil {
return err
}
inputData.Env = &env
}
prestate.Env = *inputData.Env
vmConfig := vm.Config{
Tracer: tracer,
Debug: (tracer != nil),
}
// Construct the chainconfig
var chainConfig *params.ChainConfig
if cConf, extraEips, err := tests.GetChainConfig(ctx.String(ForknameFlag.Name)); err != nil {
return NewError(ErrorConfig, fmt.Errorf("failed constructing chain configuration: %v", err))
} else {
chainConfig = cConf
vmConfig.ExtraEips = extraEips
}
// Set the chain id
chainConfig.ChainID = big.NewInt(ctx.Int64(ChainIDFlag.Name))
var txsWithKeys []*txWithKey
if txStr != stdinSelector {
inFile, err := os.Open(txStr)
if err != nil {
return NewError(ErrorIO, fmt.Errorf("failed reading txs file: %v", err))
}
defer inFile.Close()
decoder := json.NewDecoder(inFile)
if strings.HasSuffix(txStr, ".rlp") {
var body hexutil.Bytes
if err := decoder.Decode(&body); err != nil {
return err
}
var txs types.Transactions
if err := rlp.DecodeBytes(body, &txs); err != nil {
return err
}
for _, tx := range txs {
txsWithKeys = append(txsWithKeys, &txWithKey{
key: nil,
tx: tx,
})
}
} else {
if err := decoder.Decode(&txsWithKeys); err != nil {
return NewError(ErrorJson, fmt.Errorf("failed unmarshaling txs-file: %v", err))
}
}
} else {
if len(inputData.TxRlp) > 0 {
// Decode the body of already signed transactions
body := common.FromHex(inputData.TxRlp)
var txs types.Transactions
if err := rlp.DecodeBytes(body, &txs); err != nil {
return err
}
for _, tx := range txs {
txsWithKeys = append(txsWithKeys, &txWithKey{
key: nil,
tx: tx,
})
}
} else {
// JSON encoded transactions
txsWithKeys = inputData.Txs
}
}
// We may have to sign the transactions.
signer := types.MakeSigner(chainConfig, big.NewInt(int64(prestate.Env.Number)))
if txs, err = signUnsignedTransactions(txsWithKeys, signer); err != nil {
return NewError(ErrorJson, fmt.Errorf("failed signing transactions: %v", err))
}
// Sanity check, to not `panic` in state_transition
if chainConfig.IsLondon(big.NewInt(int64(prestate.Env.Number))) {
if prestate.Env.BaseFee == nil {
return NewError(ErrorConfig, errors.New("EIP-1559 config but missing 'currentBaseFee' in env section"))
}
}
// Sanity check, to not `panic` in state_transition
if prestate.Env.Random != nil && !chainConfig.IsLondon(big.NewInt(int64(prestate.Env.Number))) {
return NewError(ErrorConfig, errors.New("can only apply RANDOM on top of London chainrules"))
}
if env := prestate.Env; env.Difficulty == nil {
// If difficulty was not provided by caller, we need to calculate it.
switch {
case env.ParentDifficulty == nil:
return NewError(ErrorConfig, errors.New("currentDifficulty was not provided, and cannot be calculated due to missing parentDifficulty"))
case env.Number == 0:
return NewError(ErrorConfig, errors.New("currentDifficulty needs to be provided for block number 0"))
case env.Timestamp <= env.ParentTimestamp:
return NewError(ErrorConfig, fmt.Errorf("currentDifficulty cannot be calculated -- currentTime (%d) needs to be after parent time (%d)",
env.Timestamp, env.ParentTimestamp))
}
prestate.Env.Difficulty = calcDifficulty(chainConfig, env.Number, env.Timestamp,
env.ParentTimestamp, env.ParentDifficulty, env.ParentUncleHash)
}
// Run the test and aggregate the result
s, result, err := prestate.Apply(vmConfig, chainConfig, txs, ctx.Int64(RewardFlag.Name), getTracer)
if err != nil {
return err
}
body, _ := rlp.EncodeToBytes(txs)
// Dump the excution result
collector := make(Alloc)
s.DumpToCollector(collector, nil)
return dispatchOutput(ctx, baseDir, result, collector, body)
}
// txWithKey is a helper-struct, to allow us to use the types.Transaction along with
// a `secretKey`-field, for input
type txWithKey struct {
key *ecdsa.PrivateKey
tx *types.Transaction
protected bool
}
func (t *txWithKey) UnmarshalJSON(input []byte) error {
// Read the metadata, if present
type txMetadata struct {
Key *common.Hash `json:"secretKey"`
Protected *bool `json:"protected"`
}
var data txMetadata
if err := json.Unmarshal(input, &data); err != nil {
return err
}
if data.Key != nil {
k := data.Key.Hex()[2:]
if ecdsaKey, err := crypto.HexToECDSA(k); err != nil {
return err
} else {
t.key = ecdsaKey
}
}
if data.Protected != nil {
t.protected = *data.Protected
} else {
t.protected = true
}
// Now, read the transaction itself
var tx types.Transaction
if err := json.Unmarshal(input, &tx); err != nil {
return err
}
t.tx = &tx
return nil
}
// signUnsignedTransactions converts the input txs to canonical transactions.
//
// The transactions can have two forms, either
// 1. unsigned or
// 2. signed
// For (1), r, s, v, need so be zero, and the `secretKey` needs to be set.
// If so, we sign it here and now, with the given `secretKey`
// If the condition above is not met, then it's considered a signed transaction.
//
// To manage this, we read the transactions twice, first trying to read the secretKeys,
// and secondly to read them with the standard tx json format
func signUnsignedTransactions(txs []*txWithKey, signer types.Signer) (types.Transactions, error) {
var signedTxs []*types.Transaction
for i, txWithKey := range txs {
tx := txWithKey.tx
key := txWithKey.key
v, r, s := tx.RawSignatureValues()
if key != nil && v.BitLen()+r.BitLen()+s.BitLen() == 0 {
// This transaction needs to be signed
var (
signed *types.Transaction
err error
)
if txWithKey.protected {
signed, err = types.SignTx(tx, signer, key)
} else {
signed, err = types.SignTx(tx, types.FrontierSigner{}, key)
}
if err != nil {
return nil, NewError(ErrorJson, fmt.Errorf("tx %d: failed to sign tx: %v", i, err))
}
signedTxs = append(signedTxs, signed)
} else {
// Already signed
signedTxs = append(signedTxs, tx)
}
}
return signedTxs, nil
}
type Alloc map[common.Address]core.GenesisAccount
func (g Alloc) OnRoot(common.Hash) {}
func (g Alloc) OnAccount(addr common.Address, dumpAccount state.DumpAccount) {
balance, _ := new(big.Int).SetString(dumpAccount.Balance, 10)
var storage map[common.Hash]common.Hash
if dumpAccount.Storage != nil {
storage = make(map[common.Hash]common.Hash)
for k, v := range dumpAccount.Storage {
storage[k] = common.HexToHash(v)
}
}
genesisAccount := core.GenesisAccount{
Code: dumpAccount.Code,
Storage: storage,
Balance: balance,
Nonce: dumpAccount.Nonce,
}
g[addr] = genesisAccount
}
// saveFile marshalls the object to the given file
func saveFile(baseDir, filename string, data interface{}) error {
b, err := json.MarshalIndent(data, "", " ")
if err != nil {
return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
}
location := path.Join(baseDir, filename)
if err = ioutil.WriteFile(location, b, 0644); err != nil {
return NewError(ErrorIO, fmt.Errorf("failed writing output: %v", err))
}
log.Info("Wrote file", "file", location)
return nil
}
// dispatchOutput writes the output data to either stderr or stdout, or to the specified
// files
func dispatchOutput(ctx *cli.Context, baseDir string, result *ExecutionResult, alloc Alloc, body hexutil.Bytes) error {
stdOutObject := make(map[string]interface{})
stdErrObject := make(map[string]interface{})
dispatch := func(baseDir, fName, name string, obj interface{}) error {
switch fName {
case "stdout":
stdOutObject[name] = obj
case "stderr":
stdErrObject[name] = obj
case "":
// don't save
default: // save to file
if err := saveFile(baseDir, fName, obj); err != nil {
return err
}
}
return nil
}
if err := dispatch(baseDir, ctx.String(OutputAllocFlag.Name), "alloc", alloc); err != nil {
return err
}
if err := dispatch(baseDir, ctx.String(OutputResultFlag.Name), "result", result); err != nil {
return err
}
if err := dispatch(baseDir, ctx.String(OutputBodyFlag.Name), "body", body); err != nil {
return err
}
if len(stdOutObject) > 0 {
b, err := json.MarshalIndent(stdOutObject, "", " ")
if err != nil {
return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
}
os.Stdout.Write(b)
os.Stdout.WriteString("\n")
}
if len(stdErrObject) > 0 {
b, err := json.MarshalIndent(stdErrObject, "", " ")
if err != nil {
return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
}
os.Stderr.Write(b)
os.Stderr.WriteString("\n")
}
return nil
}