ethapi/api.go
// Copyright 2015 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 ethapi
import (
"bytes"
"context"
"errors"
"fmt"
"math/big"
"strings"
"time"
"github.com/davecgh/go-spew/spew"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/accounts/scwallet"
"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/consensus/ethash"
"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/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
"github.com/tyler-smith/go-bip39"
"github.com/Fantom-foundation/go-lachesis/evmcore"
"github.com/Fantom-foundation/go-lachesis/hash"
"github.com/Fantom-foundation/go-lachesis/inter"
"github.com/Fantom-foundation/go-lachesis/inter/idx"
lachesisparams "github.com/Fantom-foundation/go-lachesis/lachesis/params"
)
const (
defaultGasPrice = params.GWei
)
var (
noUncles = []evmcore.EvmHeader{}
)
// PublicEthereumAPI provides an API to access Ethereum related information.
// It offers only methods that operate on public data that is freely available to anyone.
type PublicEthereumAPI struct {
b Backend
}
// NewPublicEthereumAPI creates a new Ethereum protocol API.
func NewPublicEthereumAPI(b Backend) *PublicEthereumAPI {
return &PublicEthereumAPI{b}
}
// GasPrice returns a suggestion for a gas price.
func (s *PublicEthereumAPI) GasPrice(ctx context.Context) (*hexutil.Big, error) {
price, err := s.b.SuggestPrice(ctx)
return (*hexutil.Big)(price), err
}
// ProtocolVersion returns the current Ethereum protocol version this node supports
func (s *PublicEthereumAPI) ProtocolVersion() hexutil.Uint {
return hexutil.Uint(s.b.ProtocolVersion())
}
// Syncing returns true if node is syncing
func (s *PublicEthereumAPI) Syncing() (interface{}, error) {
progress := s.b.Progress()
// Return not syncing if the synchronisation already completed
if time.Since(progress.CurrentBlockTime.Time()) <= 90*time.Minute { // should be >> MaxEmitInterval
return false, nil
}
// Otherwise gather the block sync stats
return map[string]interface{}{
"startingBlock": hexutil.Uint64(0), // back-compatibility
"currentEpoch": hexutil.Uint64(progress.CurrentEpoch),
"currentBlock": hexutil.Uint64(progress.CurrentBlock),
"currentBlockHash": progress.CurrentBlockHash.Hex(),
"currentBlockTime": hexutil.Uint64(progress.CurrentBlockTime),
"highestBlock": hexutil.Uint64(progress.HighestBlock),
"highestEpoch": hexutil.Uint64(progress.HighestEpoch),
"pulledStates": hexutil.Uint64(0), // back-compatibility
"knownStates": hexutil.Uint64(0), // back-compatibility
}, nil
}
// PublicTxPoolAPI offers and API for the transaction pool. It only operates on data that is non confidential.
type PublicTxPoolAPI struct {
b Backend
}
// NewPublicTxPoolAPI creates a new tx pool service that gives information about the transaction pool.
func NewPublicTxPoolAPI(b Backend) *PublicTxPoolAPI {
return &PublicTxPoolAPI{b}
}
// Content returns the transactions contained within the transaction pool.
func (s *PublicTxPoolAPI) Content() map[string]map[string]map[string]*RPCTransaction {
content := map[string]map[string]map[string]*RPCTransaction{
"pending": make(map[string]map[string]*RPCTransaction),
"queued": make(map[string]map[string]*RPCTransaction),
}
pending, queue := s.b.TxPoolContent()
// Flatten the pending transactions
for account, txs := range pending {
dump := make(map[string]*RPCTransaction)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx)
}
content["pending"][account.Hex()] = dump
}
// Flatten the queued transactions
for account, txs := range queue {
dump := make(map[string]*RPCTransaction)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = newRPCPendingTransaction(tx)
}
content["queued"][account.Hex()] = dump
}
return content
}
// Status returns the number of pending and queued transaction in the pool.
func (s *PublicTxPoolAPI) Status() map[string]hexutil.Uint {
pending, queue := s.b.Stats()
return map[string]hexutil.Uint{
"pending": hexutil.Uint(pending),
"queued": hexutil.Uint(queue),
}
}
// Inspect retrieves the content of the transaction pool and flattens it into an
// easily inspectable list.
func (s *PublicTxPoolAPI) Inspect() map[string]map[string]map[string]string {
content := map[string]map[string]map[string]string{
"pending": make(map[string]map[string]string),
"queued": make(map[string]map[string]string),
}
pending, queue := s.b.TxPoolContent()
// Define a formatter to flatten a transaction into a string
var format = func(tx *types.Transaction) string {
if to := tx.To(); to != nil {
return fmt.Sprintf("%s: %v wei + %v gas × %v wei", tx.To().Hex(), tx.Value(), tx.Gas(), tx.GasPrice())
}
return fmt.Sprintf("contract creation: %v wei + %v gas × %v wei", tx.Value(), tx.Gas(), tx.GasPrice())
}
// Flatten the pending transactions
for account, txs := range pending {
dump := make(map[string]string)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = format(tx)
}
content["pending"][account.Hex()] = dump
}
// Flatten the queued transactions
for account, txs := range queue {
dump := make(map[string]string)
for _, tx := range txs {
dump[fmt.Sprintf("%d", tx.Nonce())] = format(tx)
}
content["queued"][account.Hex()] = dump
}
return content
}
// PublicAccountAPI provides an API to access accounts managed by this node.
// It offers only methods that can retrieve accounts.
type PublicAccountAPI struct {
am *accounts.Manager
}
// NewPublicAccountAPI creates a new PublicAccountAPI.
func NewPublicAccountAPI(am *accounts.Manager) *PublicAccountAPI {
return &PublicAccountAPI{am: am}
}
// Accounts returns the collection of accounts this node manages
func (s *PublicAccountAPI) Accounts() []common.Address {
return s.am.Accounts()
}
// PrivateAccountAPI provides an API to access accounts managed by this node.
// It offers methods to create, (un)lock en list accounts. Some methods accept
// passwords and are therefore considered private by default.
type PrivateAccountAPI struct {
am *accounts.Manager
nonceLock *AddrLocker
b Backend
}
// NewPrivateAccountAPI create a new PrivateAccountAPI.
func NewPrivateAccountAPI(b Backend, nonceLock *AddrLocker) *PrivateAccountAPI {
return &PrivateAccountAPI{
am: b.AccountManager(),
nonceLock: nonceLock,
b: b,
}
}
// ListAccounts will return a list of addresses for accounts this node manages.
func (s *PrivateAccountAPI) ListAccounts() []common.Address {
return s.am.Accounts()
}
// RawWallet is a JSON representation of an accounts.Wallet interface, with its
// data contents extracted into plain fields.
type RawWallet struct {
URL string `json:"url"`
Status string `json:"status"`
Failure string `json:"failure,omitempty"`
Accounts []accounts.Account `json:"accounts,omitempty"`
}
// ListWallets will return a list of wallets this node manages.
func (s *PrivateAccountAPI) ListWallets() []RawWallet {
wallets := make([]RawWallet, 0) // return [] instead of nil if empty
for _, wallet := range s.am.Wallets() {
status, failure := wallet.Status()
raw := RawWallet{
URL: wallet.URL().String(),
Status: status,
Accounts: wallet.Accounts(),
}
if failure != nil {
raw.Failure = failure.Error()
}
wallets = append(wallets, raw)
}
return wallets
}
// OpenWallet initiates a hardware wallet opening procedure, establishing a USB
// connection and attempting to authenticate via the provided passphrase. Note,
// the method may return an extra challenge requiring a second open (e.g. the
// Trezor PIN matrix challenge).
func (s *PrivateAccountAPI) OpenWallet(url string, passphrase *string) error {
wallet, err := s.am.Wallet(url)
if err != nil {
return err
}
pass := ""
if passphrase != nil {
pass = *passphrase
}
return wallet.Open(pass)
}
// DeriveAccount requests a HD wallet to derive a new account, optionally pinning
// it for later reuse.
func (s *PrivateAccountAPI) DeriveAccount(url string, path string, pin *bool) (accounts.Account, error) {
wallet, err := s.am.Wallet(url)
if err != nil {
return accounts.Account{}, err
}
derivPath, err := accounts.ParseDerivationPath(path)
if err != nil {
return accounts.Account{}, err
}
if pin == nil {
pin = new(bool)
}
return wallet.Derive(derivPath, *pin)
}
// NewAccount will create a new account and returns the address for the new account.
func (s *PrivateAccountAPI) NewAccount(password string) (common.Address, error) {
ks, err := fetchKeystore(s.am)
if err != nil {
return common.Address{}, err
}
acc, err := ks.NewAccount(password)
if err == nil {
log.Info("Your new key was generated", "address", acc.Address)
log.Warn("Please backup your key file!", "path", acc.URL.Path)
log.Warn("Please remember your password!")
return acc.Address, nil
}
return common.Address{}, err
}
// fetchKeystore retrieves the encrypted keystore from the account manager.
func fetchKeystore(am *accounts.Manager) (*keystore.KeyStore, error) {
if ks := am.Backends(keystore.KeyStoreType); len(ks) > 0 {
return ks[0].(*keystore.KeyStore), nil
}
return nil, errors.New("local keystore not used")
}
// ImportRawKey stores the given hex encoded ECDSA key into the key directory,
// encrypting it with the passphrase.
func (s *PrivateAccountAPI) ImportRawKey(privkey string, password string) (common.Address, error) {
key, err := crypto.HexToECDSA(privkey)
if err != nil {
return common.Address{}, err
}
ks, err := fetchKeystore(s.am)
if err != nil {
return common.Address{}, err
}
acc, err := ks.ImportECDSA(key, password)
return acc.Address, err
}
// UnlockAccount will unlock the account associated with the given address with
// the given password for duration seconds. If duration is nil it will use a
// default of 300 seconds. It returns an indication if the account was unlocked.
func (s *PrivateAccountAPI) UnlockAccount(ctx context.Context, addr common.Address, password string, duration *uint64) (bool, error) {
// When the API is exposed by external RPC(http, ws etc), unless the user
// explicitly specifies to allow the insecure account unlocking, otherwise
// it is disabled.
if s.b.ExtRPCEnabled() && !s.b.AccountManager().Config().InsecureUnlockAllowed {
return false, errors.New("account unlock with HTTP access is forbidden")
}
const max = uint64(time.Duration(math.MaxInt64) / time.Second)
var d time.Duration
if duration == nil {
d = 300 * time.Second
} else if *duration > max {
return false, errors.New("unlock duration too large")
} else {
d = time.Duration(*duration) * time.Second
}
ks, err := fetchKeystore(s.am)
if err != nil {
return false, err
}
err = ks.TimedUnlock(accounts.Account{Address: addr}, password, d)
if err != nil {
log.Warn("Failed account unlock attempt", "address", addr, "err", err)
}
return err == nil, err
}
// LockAccount will lock the account associated with the given address when it's unlocked.
func (s *PrivateAccountAPI) LockAccount(addr common.Address) bool {
if ks, err := fetchKeystore(s.am); err == nil {
return ks.Lock(addr) == nil
}
return false
}
// signTransaction sets defaults and signs the given transaction
// NOTE: the caller needs to ensure that the nonceLock is held, if applicable,
// and release it after the transaction has been submitted to the tx pool
func (s *PrivateAccountAPI) signTransaction(ctx context.Context, args *SendTxArgs, passwd string) (*types.Transaction, error) {
// Look up the wallet containing the requested signer
account := accounts.Account{Address: args.From}
wallet, err := s.am.Find(account)
if err != nil {
return nil, err
}
// Set some sanity defaults and terminate on failure
if err := args.setDefaults(ctx, s.b); err != nil {
return nil, err
}
// Assemble the transaction and sign with the wallet
tx := args.toTransaction()
return wallet.SignTxWithPassphrase(account, passwd, tx, s.b.ChainConfig().ChainID)
}
// SendTransaction will create a transaction from the given arguments and
// tries to sign it with the key associated with args.To. If the given passwd isn't
// able to decrypt the key it fails.
func (s *PrivateAccountAPI) SendTransaction(ctx context.Context, args SendTxArgs, passwd string) (common.Hash, error) {
if args.Nonce == nil {
// Hold the addresse's mutex around signing to prevent concurrent assignment of
// the same nonce to multiple accounts.
s.nonceLock.LockAddr(args.From)
defer s.nonceLock.UnlockAddr(args.From)
}
signed, err := s.signTransaction(ctx, &args, passwd)
if err != nil {
log.Warn("Failed transaction send attempt", "from", args.From, "to", args.To, "value", args.Value.ToInt(), "err", err)
return common.Hash{}, err
}
return SubmitTransaction(ctx, s.b, signed)
}
// SignTransaction will create a transaction from the given arguments and
// tries to sign it with the key associated with args.To. If the given passwd isn't
// able to decrypt the key it fails. The transaction is returned in RLP-form, not broadcast
// to other nodes
func (s *PrivateAccountAPI) SignTransaction(ctx context.Context, args SendTxArgs, passwd string) (*SignTransactionResult, error) {
// No need to obtain the noncelock mutex, since we won't be sending this
// tx into the transaction pool, but right back to the user
if args.Gas == nil {
return nil, fmt.Errorf("gas not specified")
}
if args.GasPrice == nil {
return nil, fmt.Errorf("gasPrice not specified")
}
if args.Nonce == nil {
return nil, fmt.Errorf("nonce not specified")
}
// Before actually sign the transaction, ensure the transaction fee is reasonable.
if err := checkTxFee(args.GasPrice.ToInt(), uint64(*args.Gas), s.b.RPCTxFeeCap()); err != nil {
return nil, err
}
signed, err := s.signTransaction(ctx, &args, passwd)
if err != nil {
log.Warn("Failed transaction sign attempt", "from", args.From, "to", args.To, "value", args.Value.ToInt(), "err", err)
return nil, err
}
data, err := rlp.EncodeToBytes(signed)
if err != nil {
return nil, err
}
return &SignTransactionResult{data, signed}, nil
}
// Sign calculates an Ethereum ECDSA signature for:
// keccack256("\x19Ethereum Signed Message:\n" + len(message) + message))
//
// Note, the produced signature conforms to the secp256k1 curve R, S and V values,
// where the V value will be 27 or 28 for legacy reasons.
//
// The key used to calculate the signature is decrypted with the given password.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_sign
func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr common.Address, passwd string) (hexutil.Bytes, error) {
// Look up the wallet containing the requested signer
account := accounts.Account{Address: addr}
wallet, err := s.b.AccountManager().Find(account)
if err != nil {
return nil, err
}
// Assemble sign the data with the wallet
signature, err := wallet.SignTextWithPassphrase(account, passwd, data)
if err != nil {
log.Warn("Failed data sign attempt", "address", addr, "err", err)
return nil, err
}
signature[crypto.RecoveryIDOffset] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
return signature, nil
}
// EcRecover returns the address for the account that was used to create the signature.
// Note, this function is compatible with eth_sign and personal_sign. As such it recovers
// the address of:
// hash = keccak256("\x19Ethereum Signed Message:\n"${message length}${message})
// addr = ecrecover(hash, signature)
//
// Note, the signature must conform to the secp256k1 curve R, S and V values, where
// the V value must be 27 or 28 for legacy reasons.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecover
func (s *PrivateAccountAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
if len(sig) != crypto.SignatureLength {
return common.Address{}, fmt.Errorf("signature must be %d bytes long", crypto.SignatureLength)
}
if sig[crypto.RecoveryIDOffset] != 27 && sig[crypto.RecoveryIDOffset] != 28 {
return common.Address{}, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1
rpk, err := crypto.SigToPub(accounts.TextHash(data), sig)
if err != nil {
return common.Address{}, err
}
return crypto.PubkeyToAddress(*rpk), nil
}
// SignAndSendTransaction was renamed to SendTransaction. This method is deprecated
// and will be removed in the future. It primary goal is to give clients time to update.
func (s *PrivateAccountAPI) SignAndSendTransaction(ctx context.Context, args SendTxArgs, passwd string) (common.Hash, error) {
return s.SendTransaction(ctx, args, passwd)
}
// InitializeWallet initializes a new wallet at the provided URL, by generating and returning a new private key.
func (s *PrivateAccountAPI) InitializeWallet(ctx context.Context, url string) (string, error) {
wallet, err := s.am.Wallet(url)
if err != nil {
return "", err
}
entropy, err := bip39.NewEntropy(256)
if err != nil {
return "", err
}
mnemonic, err := bip39.NewMnemonic(entropy)
if err != nil {
return "", err
}
seed := bip39.NewSeed(mnemonic, "")
switch wallet := wallet.(type) {
case *scwallet.Wallet:
return mnemonic, wallet.Initialize(seed)
default:
return "", fmt.Errorf("specified wallet does not support initialization")
}
}
// Unpair deletes a pairing between wallet and geth.
func (s *PrivateAccountAPI) Unpair(ctx context.Context, url string, pin string) error {
wallet, err := s.am.Wallet(url)
if err != nil {
return err
}
switch wallet := wallet.(type) {
case *scwallet.Wallet:
return wallet.Unpair([]byte(pin))
default:
return fmt.Errorf("specified wallet does not support pairing")
}
}
// PublicBlockChainAPI provides an API to access the Ethereum blockchain.
// It offers only methods that operate on public data that is freely available to anyone.
type PublicBlockChainAPI struct {
b Backend
}
// NewPublicBlockChainAPI creates a new Ethereum blockchain API.
func NewPublicBlockChainAPI(b Backend) *PublicBlockChainAPI {
return &PublicBlockChainAPI{b}
}
// ChainID returns the chainID value for transaction replay protection.
func (s *PublicBlockChainAPI) ChainID() *hexutil.Big {
return (*hexutil.Big)(s.b.ChainConfig().ChainID)
}
// BlockNumber returns the block number of the chain head.
func (s *PublicBlockChainAPI) BlockNumber() hexutil.Uint64 {
header, _ := s.b.HeaderByNumber(context.Background(), rpc.LatestBlockNumber) // latest header should always be available
return hexutil.Uint64(header.Number.Uint64())
}
// GetBalance returns the amount of wei for the given address in the state of the
// given block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta
// block numbers are also allowed.
func (s *PublicBlockChainAPI) GetBalance(ctx context.Context, address common.Address, blockNrOrHash rpc.BlockNumberOrHash) (*hexutil.Big, error) {
state, _, err := s.b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if state == nil || err != nil {
return nil, err
}
return (*hexutil.Big)(state.GetBalance(address)), state.Error()
}
// AccountResult is result struct for GetProof
type AccountResult struct {
Address common.Address `json:"address"`
AccountProof []string `json:"accountProof"`
Balance *hexutil.Big `json:"balance"`
CodeHash common.Hash `json:"codeHash"`
Nonce hexutil.Uint64 `json:"nonce"`
StorageHash common.Hash `json:"storageHash"`
StorageProof []StorageResult `json:"storageProof"`
}
// StorageResult is result struct for GetProof
type StorageResult struct {
Key string `json:"key"`
Value *hexutil.Big `json:"value"`
Proof []string `json:"proof"`
}
// GetProof returns the Merkle-proof for a given account and optionally some storage keys.
func (s *PublicBlockChainAPI) GetProof(ctx context.Context, address common.Address, storageKeys []string, blockNr rpc.BlockNumberOrHash) (*AccountResult, error) {
state, _, err := s.b.StateAndHeaderByNumberOrHash(ctx, blockNr)
if state == nil || err != nil {
return nil, err
}
storageTrie := state.StorageTrie(address)
storageHash := types.EmptyRootHash
codeHash := state.GetCodeHash(address)
storageProof := make([]StorageResult, len(storageKeys))
// if we have a storageTrie, (which means the account exists), we can update the storagehash
if storageTrie != nil {
storageHash = storageTrie.Hash()
} else {
// no storageTrie means the account does not exist, so the codeHash is the hash of an empty bytearray.
codeHash = crypto.Keccak256Hash(nil)
}
// create the proof for the storageKeys
for i, key := range storageKeys {
if storageTrie != nil {
proof, storageError := state.GetStorageProof(address, common.HexToHash(key))
if storageError != nil {
return nil, storageError
}
storageProof[i] = StorageResult{key, (*hexutil.Big)(state.GetState(address, common.HexToHash(key)).Big()), common.ToHexArray(proof)}
} else {
storageProof[i] = StorageResult{key, &hexutil.Big{}, []string{}}
}
}
// create the accountProof
accountProof, proofErr := state.GetProof(address)
if proofErr != nil {
return nil, proofErr
}
return &AccountResult{
Address: address,
AccountProof: common.ToHexArray(accountProof),
Balance: (*hexutil.Big)(state.GetBalance(address)),
CodeHash: codeHash,
Nonce: hexutil.Uint64(state.GetNonce(address)),
StorageHash: storageHash,
StorageProof: storageProof,
}, state.Error()
}
// GetHeaderByNumber returns the requested canonical block header.
// * When blockNr is -1 the chain head is returned.
// * When blockNr is -2 the pending chain head is returned.
func (s *PublicBlockChainAPI) GetHeaderByNumber(ctx context.Context, number rpc.BlockNumber) (map[string]interface{}, error) {
header, err := s.b.HeaderByNumber(ctx, number)
if header != nil && err == nil {
response := s.rpcMarshalHeader(header, s.calculateLogsBloom(ctx, number))
if number == rpc.PendingBlockNumber {
// Pending header need to nil out a few fields
for _, field := range []string{"hash", "nonce", "miner"} {
response[field] = nil
}
}
return response, err
}
return nil, err
}
// GetHeaderByHash returns the requested header by hash.
func (s *PublicBlockChainAPI) GetHeaderByHash(ctx context.Context, hash common.Hash) map[string]interface{} {
header, _ := s.b.HeaderByHash(ctx, hash)
if header != nil {
return s.rpcMarshalHeader(header, s.calculateLogsBloom(ctx, rpc.BlockNumber(header.Number.Uint64())))
}
return nil
}
func (s *PublicBlockChainAPI) calculateLogsBloom(ctx context.Context, blkNumber rpc.BlockNumber) types.Bloom {
if s.b.CalcLogsBloom() && blkNumber != rpc.EarliestBlockNumber {
receipts, err := s.b.GetReceiptsByNumber(ctx, blkNumber)
if err != nil {
return types.Bloom{}
}
if receipts != nil {
return types.CreateBloom(receipts)
}
}
return types.Bloom{}
}
// GetBlockByNumber returns the requested canonical block.
// * When blockNr is -1 the chain head is returned.
// * When blockNr is -2 the pending chain head is returned.
// * When fullTx is true all transactions in the block are returned, otherwise
// only the transaction hash is returned.
func (s *PublicBlockChainAPI) GetBlockByNumber(ctx context.Context, number rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
block, err := s.b.BlockByNumber(ctx, number)
if block != nil && err == nil {
response, err := s.rpcMarshalBlock(block, s.calculateLogsBloom(ctx, number), true, fullTx)
if err == nil && number == rpc.PendingBlockNumber {
// Pending blocks need to nil out a few fields
for _, field := range []string{"hash", "nonce", "miner"} {
response[field] = nil
}
}
return response, err
}
return nil, err
}
// GetBlockByHash returns the requested block. When fullTx is true all transactions in the block are returned in full
// detail, otherwise only the transaction hash is returned.
func (s *PublicBlockChainAPI) GetBlockByHash(ctx context.Context, hash common.Hash, fullTx bool) (map[string]interface{}, error) {
block, err := s.b.BlockByHash(ctx, hash)
if block != nil {
return s.rpcMarshalBlock(block, s.calculateLogsBloom(ctx, rpc.BlockNumber(block.NumberU64())), true, fullTx)
}
return nil, err
}
// GetUncleByBlockNumberAndIndex returns the uncle block for the given block hash and index. When fullTx is true
// all transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
func (s *PublicBlockChainAPI) GetUncleByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index hexutil.Uint) (map[string]interface{}, error) {
block, err := s.b.BlockByNumber(ctx, blockNr)
if block != nil {
log.Debug("Requested uncle not found", "number", blockNr, "hash", block.Hash, "index", index)
return nil, nil
}
return nil, err
}
// GetUncleByBlockHashAndIndex returns the uncle block for the given block hash and index. When fullTx is true
// all transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
func (s *PublicBlockChainAPI) GetUncleByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index hexutil.Uint) (map[string]interface{}, error) {
block, err := s.b.BlockByHash(ctx, blockHash)
if block != nil {
log.Debug("Requested uncle not found", "number", block.Number, "hash", blockHash, "index", index)
return nil, nil
}
return nil, err
}
// GetUncleCountByBlockNumber returns number of uncles in the block for the given block number
func (s *PublicBlockChainAPI) GetUncleCountByBlockNumber(ctx context.Context, blockNr rpc.BlockNumber) *hexutil.Uint {
if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
n := hexutil.Uint(len(noUncles))
return &n
}
return nil
}
// GetUncleCountByBlockHash returns number of uncles in the block for the given block hash
func (s *PublicBlockChainAPI) GetUncleCountByBlockHash(ctx context.Context, blockHash common.Hash) *hexutil.Uint {
if block, _ := s.b.BlockByHash(ctx, blockHash); block != nil {
n := hexutil.Uint(len(noUncles))
return &n
}
return nil
}
// GetCode returns the code stored at the given address in the state for the given block number.
func (s *PublicBlockChainAPI) GetCode(ctx context.Context, address common.Address, blockNrOrHash rpc.BlockNumberOrHash) (hexutil.Bytes, error) {
state, _, err := s.b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if state == nil || err != nil {
return nil, err
}
code := state.GetCode(address)
return code, state.Error()
}
// GetStorageAt returns the storage from the state at the given address, key and
// block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta block
// numbers are also allowed.
func (s *PublicBlockChainAPI) GetStorageAt(ctx context.Context, address common.Address, key string, blockNr rpc.BlockNumberOrHash) (hexutil.Bytes, error) {
state, _, err := s.b.StateAndHeaderByNumberOrHash(ctx, blockNr)
if state == nil || err != nil {
return nil, err
}
res := state.GetState(address, common.HexToHash(key))
return res[:], state.Error()
}
// CallArgs represents the arguments for a call.
type CallArgs struct {
From *common.Address `json:"from"`
To *common.Address `json:"to"`
Gas *hexutil.Uint64 `json:"gas"`
GasPrice *hexutil.Big `json:"gasPrice"`
Value *hexutil.Big `json:"value"`
Data *hexutil.Bytes `json:"data"`
}
// ToMessage converts CallArgs to the Message type used by the core evm
func (args *CallArgs) ToMessage(globalGasCap uint64) types.Message {
// Set sender address or use zero address if none specified.
var addr common.Address
if args.From != nil {
addr = *args.From
}
// Set default gas & gas price if none were set
gas := globalGasCap
if gas == 0 {
gas = uint64(math.MaxUint64 / 2)
}
if args.Gas != nil {
gas = uint64(*args.Gas)
}
if globalGasCap != 0 && globalGasCap < gas {
log.Warn("Caller gas above allowance, capping", "requested", gas, "cap", globalGasCap)
gas = globalGasCap
}
gasPrice := new(big.Int)
if args.GasPrice != nil {
gasPrice = args.GasPrice.ToInt()
}
value := new(big.Int)
if args.Value != nil {
value = args.Value.ToInt()
}
var data []byte
if args.Data != nil {
data = []byte(*args.Data)
}
msg := types.NewMessage(addr, args.To, 0, value, gas, gasPrice, data, false)
return msg
}
// account indicates the overriding fields of account during the execution of
// a message call.
// Note, state and stateDiff can't be specified at the same time. If state is
// set, message execution will only use the data in the given state. Otherwise
// if statDiff is set, all diff will be applied first and then execute the call
// message.
type account struct {
Nonce *hexutil.Uint64 `json:"nonce"`
Code *hexutil.Bytes `json:"code"`
Balance **hexutil.Big `json:"balance"`
State *map[common.Hash]common.Hash `json:"state"`
StateDiff *map[common.Hash]common.Hash `json:"stateDiff"`
}
func DoCall(ctx context.Context, b Backend, args CallArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides map[common.Address]account, vmCfg vm.Config, timeout time.Duration, globalGasCap uint64) (*evmcore.ExecutionResult, error) {
defer func(start time.Time) { log.Debug("Executing EVM call finished", "runtime", time.Since(start)) }(time.Now())
state, header, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if state == nil || err != nil {
return nil, err
}
// Override the fields of specified contracts before execution.
for addr, account := range overrides {
// Override account nonce.
if account.Nonce != nil {
state.SetNonce(addr, uint64(*account.Nonce))
}
// Override account(contract) code.
if account.Code != nil {
state.SetCode(addr, *account.Code)
}
// Override account balance.
if account.Balance != nil {
state.SetBalance(addr, (*big.Int)(*account.Balance))
}
if account.State != nil && account.StateDiff != nil {
return nil, fmt.Errorf("account %s has both 'state' and 'stateDiff'", addr.Hex())
}
// Replace entire state if caller requires.
if account.State != nil {
state.SetStorage(addr, *account.State)
}
// Apply state diff into specified accounts.
if account.StateDiff != nil {
for key, value := range *account.StateDiff {
state.SetState(addr, key, value)
}
}
}
// Setup context so it may be cancelled the call has completed
// or, in case of unmetered gas, setup a context with a timeout.
var cancel context.CancelFunc
if timeout > 0 {
ctx, cancel = context.WithTimeout(ctx, timeout)
} else {
ctx, cancel = context.WithCancel(ctx)
}
// Make sure the context is cancelled when the call has completed
// this makes sure resources are cleaned up.
defer cancel()
// Get a new instance of the EVM.
msg := args.ToMessage(globalGasCap)
evm, vmError, err := b.GetEVM(ctx, msg, state, header)
if err != nil {
return nil, err
}
// Wait for the context to be done and cancel the evm. Even if the
// EVM has finished, cancelling may be done (repeatedly)
go func() {
<-ctx.Done()
evm.Cancel()
}()
// Setup the gas pool (also for unmetered requests)
// and apply the message.
gp := new(evmcore.GasPool).AddGas(math.MaxUint64)
result, err := evmcore.ApplyMessage(evm, msg, gp)
if err := vmError(); err != nil {
return nil, err
}
// If the timer caused an abort, return an appropriate error message
if evm.Cancelled() {
return nil, fmt.Errorf("execution aborted (timeout = %v)", timeout)
}
if err != nil {
return result, fmt.Errorf("err: %w (supplied gas %d)", err, msg.Gas())
}
return result, nil
}
func newRevertError(result *evmcore.ExecutionResult) *revertError {
reason, errUnpack := abi.UnpackRevert(result.Revert())
err := errors.New("execution reverted")
if errUnpack == nil {
err = fmt.Errorf("execution reverted: %v", reason)
}
return &revertError{
error: err,
reason: hexutil.Encode(result.Revert()),
}
}
// revertError is an API error that encompassas an EVM revertal with JSON error
// code and a binary data blob.
type revertError struct {
error
reason string // revert reason hex encoded
}
// ErrorCode returns the JSON error code for a revertal.
// See: https://github.com/ethereum/wiki/wiki/JSON-RPC-Error-Codes-Improvement-Proposal
func (e *revertError) ErrorCode() int {
return 3
}
// ErrorData returns the hex encoded revert reason.
func (e *revertError) ErrorData() interface{} {
return e.reason
}
// Call executes the given transaction on the state for the given block number.
//
// Additionally, the caller can specify a batch of contract for fields overriding.
//
// Note, this function doesn't make and changes in the state/blockchain and is
// useful to execute and retrieve values.
func (s *PublicBlockChainAPI) Call(ctx context.Context, args CallArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides *map[common.Address]account) (hexutil.Bytes, error) {
var accounts map[common.Address]account
if overrides != nil {
accounts = *overrides
}
result, err := DoCall(ctx, s.b, args, blockNrOrHash, accounts, vm.Config{}, 5*time.Second, s.b.RPCGasCap())
if err != nil {
return nil, err
}
// If the result contains a revert reason, try to unpack and return it.
if len(result.Revert()) > 0 {
return nil, newRevertError(result)
}
return result.Return(), result.Err
}
// DoEstimateGas - binary search the gas requirement, as it may be higher than the amount used
func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNrOrHash rpc.BlockNumberOrHash, gasCap uint64) (hexutil.Uint64, error) {
// Binary search the gas requirement, as it may be higher than the amount used
var (
lo uint64 = params.TxGas - 1
hi uint64
cap uint64
)
// Use zero address if sender unspecified.
if args.From == nil {
args.From = new(common.Address)
}
// Determine the highest gas limit can be used during the estimation.
if args.Gas != nil && uint64(*args.Gas) >= params.TxGas {
hi = uint64(*args.Gas)
} else {
hi = lachesisparams.MaxGasLimit()
}
// Recap the highest gas limit with account's available balance.
if args.GasPrice != nil && args.GasPrice.ToInt().BitLen() != 0 {
state, _, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if err != nil {
return 0, err
}
balance := state.GetBalance(*args.From) // from can't be nil
available := new(big.Int).Set(balance)
if args.Value != nil {
if args.Value.ToInt().Cmp(available) >= 0 {
return 0, errors.New("insufficient funds for transfer")
}
available.Sub(available, args.Value.ToInt())
}
allowance := new(big.Int).Div(available, args.GasPrice.ToInt())
// If the allowance is larger than maximum uint64, skip checking
if allowance.IsUint64() && hi > allowance.Uint64() {
transfer := args.Value
if transfer == nil {
transfer = new(hexutil.Big)
}
log.Warn("Gas estimation capped by limited funds", "original", hi, "balance", balance,
"sent", transfer.ToInt(), "gasprice", args.GasPrice.ToInt(), "fundable", allowance)
hi = allowance.Uint64()
}
}
// Recap the highest gas allowance with specified gascap.
if gasCap != 0 && hi > gasCap {
log.Warn("Caller gas above allowance, capping", "requested", hi, "cap", gasCap)
hi = gasCap
}
cap = hi
// Create a helper to check if a gas allowance results in an executable transaction
executable := func(gas uint64) (bool, *evmcore.ExecutionResult, error) {
args.Gas = (*hexutil.Uint64)(&gas)
result, err := DoCall(ctx, b, args, blockNrOrHash, nil, vm.Config{}, 0, gasCap)
if err != nil {
if errors.Is(err, evmcore.ErrIntrinsicGas) {
return true, nil, nil // Special case, raise gas limit
}
return true, nil, err // Bail out
}
return result.Failed(), result, nil
}
// Execute the binary search and hone in on an executable gas limit
for lo+1 < hi {
mid := (hi + lo) / 2
failed, _, err := executable(mid)
// If the error is not nil(consensus error), it means the provided message
// call or transaction will never be accepted no matter how much gas it is
// assigned. Return the error directly, don't struggle any more.
if err != nil {
return 0, err
}
if failed {
lo = mid
} else {
hi = mid
}
}
// Reject the transaction as invalid if it still fails at the highest allowance
if hi == cap {
failed, result, err := executable(hi)
if err != nil {
return 0, err
}
if failed {
if result != nil && result.Err != vm.ErrOutOfGas {
if len(result.Revert()) > 0 {
return 0, newRevertError(result)
}
return 0, result.Err
}
// Otherwise, the specified gas cap is too low
return 0, fmt.Errorf("gas required exceeds allowance (%d)", cap)
}
}
return hexutil.Uint64(hi), nil
}
// EstimateGas returns an estimate of the amount of gas needed to execute the
// given transaction against the current pending block.
func (s *PublicBlockChainAPI) EstimateGas(ctx context.Context, args CallArgs, blockNrOrHash *rpc.BlockNumberOrHash) (hexutil.Uint64, error) {
bNrOrHash := rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber)
if blockNrOrHash != nil {
bNrOrHash = *blockNrOrHash
}
return DoEstimateGas(ctx, s.b, args, bNrOrHash, s.b.RPCGasCap())
}
// ExecutionResult groups all structured logs emitted by the EVM
// while replaying a transaction in debug mode as well as transaction
// execution status, the amount of gas used and the return value
type ExecutionResult struct {
Gas uint64 `json:"gas"`
Failed bool `json:"failed"`
ReturnValue string `json:"returnValue"`
StructLogs []StructLogRes `json:"structLogs"`
}
// StructLogRes stores a structured log emitted by the EVM while replaying a
// transaction in debug mode
type StructLogRes struct {
Pc uint64 `json:"pc"`
Op string `json:"op"`
Gas uint64 `json:"gas"`
GasCost uint64 `json:"gasCost"`
Depth int `json:"depth"`
Error error `json:"error,omitempty"`
Stack *[]string `json:"stack,omitempty"`
Memory *[]string `json:"memory,omitempty"`
Storage *map[string]string `json:"storage,omitempty"`
}
// FormatLogs formats EVM returned structured logs for json output
func FormatLogs(logs []vm.StructLog) []StructLogRes {
formatted := make([]StructLogRes, len(logs))
for index, trace := range logs {
formatted[index] = StructLogRes{
Pc: trace.Pc,
Op: trace.Op.String(),
Gas: trace.Gas,
GasCost: trace.GasCost,
Depth: trace.Depth,
Error: trace.Err,
}
if trace.Stack != nil {
stack := make([]string, len(trace.Stack))
for i, stackValue := range trace.Stack {
stack[i] = fmt.Sprintf("%x", math.PaddedBigBytes(stackValue, 32))
}
formatted[index].Stack = &stack
}
if trace.Memory != nil {
memory := make([]string, 0, (len(trace.Memory)+31)/32)
for i := 0; i+32 <= len(trace.Memory); i += 32 {
memory = append(memory, fmt.Sprintf("%x", trace.Memory[i:i+32]))
}
formatted[index].Memory = &memory
}
if trace.Storage != nil {
storage := make(map[string]string)
for i, storageValue := range trace.Storage {
storage[fmt.Sprintf("%x", i)] = fmt.Sprintf("%x", storageValue)
}
formatted[index].Storage = &storage
}
}
return formatted
}
// RPCMarshalEventHeader converts the given header to the RPC output .
func RPCMarshalEventHeader(header *inter.EventHeaderData) map[string]interface{} {
return map[string]interface{}{
"version": header.Version,
"epoch": header.Epoch,
"seq": header.Seq,
"hash": hexutil.Bytes(header.Hash().Bytes()),
"frame": header.Frame,
"isRoot": header.IsRoot,
"creator": header.Creator,
"prevEpochHash": header.PrevEpochHash,
"parents": eventIDsToHex(header.Parents),
"lamport": header.Lamport,
"claimedTime": header.ClaimedTime,
"medianTime": header.MedianTime,
"extraData": hexutil.Bytes(header.Extra),
"transactionsRoot": hexutil.Bytes(header.TxHash.Bytes()),
"gasPowerLeft": map[string]interface{}{
"shortTerm": header.GasPowerLeft.Gas[idx.ShortTermGas],
"longTerm": header.GasPowerLeft.Gas[idx.LongTermGas],
},
"gasPowerUsed": header.GasPowerUsed,
}
}
// RPCMarshalEvent converts the given event to the RPC output which depends on fullTx. If inclTx is true transactions are
// returned. When fullTx is true the returned block contains full transaction details, otherwise it will only contain
// transaction hashes.
func RPCMarshalEvent(event *inter.Event, inclTx bool, fullTx bool) (map[string]interface{}, error) {
fields := RPCMarshalEventHeader(&event.EventHeaderData)
fields["size"] = event.Size()
if inclTx {
formatTx := func(tx *types.Transaction) (interface{}, error) {
return tx.Hash(), nil
}
if fullTx {
// TODO full txs for events API
//formatTx = func(tx *types.Transaction) (interface{}, error) {
// return newRPCTransactionFromBlockHash(event, tx.Hash()), nil
//}
}
txs := event.Transactions
transactions := make([]interface{}, len(txs))
var err error
for i, tx := range txs {
if transactions[i], err = formatTx(tx); err != nil {
return nil, err
}
}
fields["transactions"] = transactions
}
return fields, nil
}
func eventIDsToHex(ids hash.Events) []hexutil.Bytes {
res := make([]hexutil.Bytes, len(ids))
for i, id := range ids {
res[i] = eventIDToHex(id)
}
return res
}
func eventIDToHex(id hash.Event) hexutil.Bytes {
return hexutil.Bytes(id.Bytes())
}
// RPCMarshalHeader converts the given header to the RPC output .
func RPCMarshalHeader(head *evmcore.EvmHeader, bloom types.Bloom) map[string]interface{} {
return map[string]interface{}{
"number": (*hexutil.Big)(head.Number),
"hash": head.Hash, // store EvmBlock's hash in extra, because extra is always empty
"parentHash": head.ParentHash,
"nonce": types.BlockNonce{},
"mixHash": common.Hash{},
"sha3Uncles": types.EmptyUncleHash,
"logsBloom": bloom,
"stateRoot": head.Root,
"miner": head.Coinbase,
"difficulty": (*hexutil.Big)(new(big.Int)),
"extraData": hexutil.Bytes([]byte{}),
"size": hexutil.Uint64(head.EthHeader().Size()),
"gasLimit": hexutil.Uint64(0xffffffffffff), // don't use too much bits here to avoid parsing issues
"gasUsed": hexutil.Uint64(head.GasUsed),
"timestamp": hexutil.Uint64(head.Time.Unix()),
"timestampNano": hexutil.Uint64(head.Time),
"transactionsRoot": head.TxHash,
"receiptsRoot": common.Hash{},
}
}
// RPCMarshalBlock converts the given block to the RPC output which depends on fullTx. If inclTx is true transactions are
// returned. When fullTx is true the returned block contains full transaction details, otherwise it will only contain
// transaction hashes.
func RPCMarshalBlock(block *evmcore.EvmBlock, bloom types.Bloom, inclTx bool, fullTx bool) (map[string]interface{}, error) {
fields := RPCMarshalHeader(block.Header(), bloom)
fields["size"] = hexutil.Uint64(block.EthBlock().Size())
if inclTx {
formatTx := func(tx *types.Transaction) (interface{}, error) {
return tx.Hash(), nil
}
if fullTx {
formatTx = func(tx *types.Transaction) (interface{}, error) {
return newRPCTransactionFromBlockHash(block, tx.Hash()), nil
}
}
txs := block.Transactions
transactions := make([]interface{}, len(txs))
var err error
for i, tx := range txs {
if transactions[i], err = formatTx(tx); err != nil {
return nil, err
}
}
fields["transactions"] = transactions
}
uncles := noUncles
uncleHashes := make([]common.Hash, len(uncles))
for i, uncle := range uncles {
uncleHashes[i] = uncle.Hash
}
fields["uncles"] = uncleHashes
return fields, nil
}
// rpcMarshalHeader uses the generalized output filler, then adds the total difficulty field, which requires
// a `PublicBlockchainAPI`.
func (s *PublicBlockChainAPI) rpcMarshalHeader(header *evmcore.EvmHeader, bloom types.Bloom) map[string]interface{} {
fields := RPCMarshalHeader(header, bloom)
fields["totalDifficulty"] = (*hexutil.Big)(s.b.GetTd(header.Hash))
return fields
}
// rpcMarshalBlock uses the generalized output filler, then adds the total difficulty field, which requires
// a `PublicBlockchainAPI`.
func (s *PublicBlockChainAPI) rpcMarshalBlock(b *evmcore.EvmBlock, bloom types.Bloom, inclTx bool, fullTx bool) (map[string]interface{}, error) {
fields, err := RPCMarshalBlock(b, bloom, inclTx, fullTx)
if err != nil {
return nil, err
}
fields["totalDifficulty"] = (*hexutil.Big)(s.b.GetTd(b.Hash))
return fields, err
}
// RPCTransaction represents a transaction that will serialize to the RPC representation of a transaction
type RPCTransaction struct {
BlockHash *common.Hash `json:"blockHash"`
BlockNumber *hexutil.Big `json:"blockNumber"`
From common.Address `json:"from"`
Gas hexutil.Uint64 `json:"gas"`
GasPrice *hexutil.Big `json:"gasPrice"`
Hash common.Hash `json:"hash"`
Input hexutil.Bytes `json:"input"`
Nonce hexutil.Uint64 `json:"nonce"`
To *common.Address `json:"to"`
TransactionIndex *hexutil.Uint64 `json:"transactionIndex"`
Value *hexutil.Big `json:"value"`
V *hexutil.Big `json:"v"`
R *hexutil.Big `json:"r"`
S *hexutil.Big `json:"s"`
}
// newRPCTransaction returns a transaction that will serialize to the RPC
// representation, with the given location metadata set (if available).
func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber uint64, index uint64) *RPCTransaction {
var signer types.Signer = types.FrontierSigner{}
if tx.Protected() {
signer = types.NewEIP155Signer(tx.ChainId())
}
from, _ := types.Sender(signer, tx)
v, r, s := tx.RawSignatureValues()
result := &RPCTransaction{
From: from,
Gas: hexutil.Uint64(tx.Gas()),
GasPrice: (*hexutil.Big)(tx.GasPrice()),
Hash: tx.Hash(),
Input: hexutil.Bytes(tx.Data()),
Nonce: hexutil.Uint64(tx.Nonce()),
To: tx.To(),
Value: (*hexutil.Big)(tx.Value()),
V: (*hexutil.Big)(v),
R: (*hexutil.Big)(r),
S: (*hexutil.Big)(s),
}
if blockHash != hash.Zero {
result.BlockHash = &blockHash
result.BlockNumber = (*hexutil.Big)(new(big.Int).SetUint64(blockNumber))
result.TransactionIndex = (*hexutil.Uint64)(&index)
}
return result
}
// newRPCPendingTransaction returns a pending transaction that will serialize to the RPC representation
func newRPCPendingTransaction(tx *types.Transaction) *RPCTransaction {
return newRPCTransaction(tx, common.Hash{}, 0, 0)
}
// newRPCTransactionFromBlockIndex returns a transaction that will serialize to the RPC representation.
func newRPCTransactionFromBlockIndex(b *evmcore.EvmBlock, index uint64) *RPCTransaction {
txs := b.Transactions
if index >= uint64(len(txs)) {
return nil
}
return newRPCTransaction(txs[index], b.Hash, b.NumberU64(), index)
}
// newRPCRawTransactionFromBlockIndex returns the bytes of a transaction given a block and a transaction index.
func newRPCRawTransactionFromBlockIndex(b *evmcore.EvmBlock, index uint64) hexutil.Bytes {
txs := b.Transactions
if index >= uint64(len(txs)) {
return nil
}
blob, _ := rlp.EncodeToBytes(txs[index])
return blob
}
// newRPCTransactionFromBlockHash returns a transaction that will serialize to the RPC representation.
func newRPCTransactionFromBlockHash(b *evmcore.EvmBlock, hash common.Hash) *RPCTransaction {
for idx, tx := range b.Transactions {
if tx.Hash() == hash {
return newRPCTransactionFromBlockIndex(b, uint64(idx))
}
}
return nil
}
// PublicTransactionPoolAPI exposes methods for the RPC interface
type PublicTransactionPoolAPI struct {
b Backend
nonceLock *AddrLocker
}
// NewPublicTransactionPoolAPI creates a new RPC service with methods specific for the transaction pool.
func NewPublicTransactionPoolAPI(b Backend, nonceLock *AddrLocker) *PublicTransactionPoolAPI {
return &PublicTransactionPoolAPI{b, nonceLock}
}
// GetBlockTransactionCountByNumber returns the number of transactions in the block with the given block number.
func (s *PublicTransactionPoolAPI) GetBlockTransactionCountByNumber(ctx context.Context, blockNr rpc.BlockNumber) *hexutil.Uint {
if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
n := hexutil.Uint(len(block.Transactions))
return &n
}
return nil
}
// GetBlockTransactionCountByHash returns the number of transactions in the block with the given hash.
func (s *PublicTransactionPoolAPI) GetBlockTransactionCountByHash(ctx context.Context, blockHash common.Hash) *hexutil.Uint {
if block, _ := s.b.BlockByHash(ctx, blockHash); block != nil {
n := hexutil.Uint(len(block.Transactions))
return &n
}
return nil
}
// GetTransactionByBlockNumberAndIndex returns the transaction for the given block number and index.
func (s *PublicTransactionPoolAPI) GetTransactionByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index hexutil.Uint) *RPCTransaction {
if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
return newRPCTransactionFromBlockIndex(block, uint64(index))
}
return nil
}
// GetTransactionByBlockHashAndIndex returns the transaction for the given block hash and index.
func (s *PublicTransactionPoolAPI) GetTransactionByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index hexutil.Uint) *RPCTransaction {
if block, _ := s.b.BlockByHash(ctx, blockHash); block != nil {
return newRPCTransactionFromBlockIndex(block, uint64(index))
}
return nil
}
// GetRawTransactionByBlockNumberAndIndex returns the bytes of the transaction for the given block number and index.
func (s *PublicTransactionPoolAPI) GetRawTransactionByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index hexutil.Uint) hexutil.Bytes {
if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
return newRPCRawTransactionFromBlockIndex(block, uint64(index))
}
return nil
}
// GetRawTransactionByBlockHashAndIndex returns the bytes of the transaction for the given block hash and index.
func (s *PublicTransactionPoolAPI) GetRawTransactionByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index hexutil.Uint) hexutil.Bytes {
if block, _ := s.b.BlockByHash(ctx, blockHash); block != nil {
return newRPCRawTransactionFromBlockIndex(block, uint64(index))
}
return nil
}
// GetTransactionCount returns the number of transactions the given address has sent for the given block number
func (s *PublicTransactionPoolAPI) GetTransactionCount(ctx context.Context, address common.Address, blockNrOrHash rpc.BlockNumberOrHash) (*hexutil.Uint64, error) {
// Ask transaction pool for the nonce which includes pending transactions
if blockNr, ok := blockNrOrHash.Number(); ok && blockNr == rpc.PendingBlockNumber {
nonce, err := s.b.GetPoolNonce(ctx, address)
if err != nil {
return nil, err
}
return (*hexutil.Uint64)(&nonce), nil
}
// Resolve block number and use its state to ask for the nonce
state, _, err := s.b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if state == nil || err != nil {
return nil, err
}
nonce := state.GetNonce(address)
return (*hexutil.Uint64)(&nonce), state.Error()
}
// GetTransactionByHash returns the transaction for the given hash
func (s *PublicTransactionPoolAPI) GetTransactionByHash(ctx context.Context, hash common.Hash) (*RPCTransaction, error) {
// Try to return an already finalized transaction
tx, blockNumber, index, err := s.b.GetTransaction(ctx, hash)
if err != nil {
return nil, err
}
if tx != nil {
header, err := s.b.HeaderByNumber(ctx, rpc.BlockNumber(blockNumber)) // retrieve header to get block hash
if err != nil {
return nil, err
}
return newRPCTransaction(tx, header.Hash, blockNumber, index), nil
}
// No finalized transaction, try to retrieve it from the pool
if tx := s.b.GetPoolTransaction(hash); tx != nil {
return newRPCPendingTransaction(tx), nil
}
// Transaction unknown, return as such
return nil, nil
}
// GetRawTransactionByHash returns the bytes of the transaction for the given hash.
func (s *PublicTransactionPoolAPI) GetRawTransactionByHash(ctx context.Context, hash common.Hash) (hexutil.Bytes, error) {
// Retrieve a finalized transaction, or a pooled otherwise
tx, _, _, err := s.b.GetTransaction(ctx, hash)
if err != nil {
return nil, err
}
if tx == nil {
if tx = s.b.GetPoolTransaction(hash); tx == nil {
// Transaction not found anywhere, abort
return nil, nil
}
}
// Serialize to RLP and return
return rlp.EncodeToBytes(tx)
}
// GetTransactionReceipt returns the transaction receipt for the given transaction hash.
func (s *PublicTransactionPoolAPI) GetTransactionReceipt(ctx context.Context, hash common.Hash) (map[string]interface{}, error) {
tx, blockNumber, index, err := s.b.GetTransaction(ctx, hash)
if tx == nil || err != nil {
return nil, err
}
header, err := s.b.HeaderByNumber(ctx, rpc.BlockNumber(blockNumber)) // retrieve header to get block hash
if header == nil || err != nil {
return nil, err
}
receipts, err := s.b.GetReceiptsByNumber(ctx, rpc.BlockNumber(blockNumber))
if receipts == nil || err != nil {
return nil, err
}
if len(receipts) <= int(index) {
return nil, nil
}
receipt := receipts[index]
for _, l := range receipt.Logs {
l.TxHash = hash
l.BlockHash = header.Hash
l.BlockNumber = blockNumber
}
var signer types.Signer = types.FrontierSigner{}
if tx.Protected() {
signer = types.NewEIP155Signer(tx.ChainId())
}
from, _ := types.Sender(signer, tx)
fields := map[string]interface{}{
"blockHash": header.Hash,
"blockNumber": hexutil.Uint64(blockNumber),
"transactionHash": hash,
"transactionIndex": hexutil.Uint64(index),
"from": from,
"to": tx.To(),
"gasUsed": hexutil.Uint64(receipt.GasUsed),
"cumulativeGasUsed": hexutil.Uint64(receipt.CumulativeGasUsed),
"contractAddress": nil,
"logs": receipt.Logs,
"logsBloom": &receipt.Bloom,
}
// Assign receipt status or post state.
if len(receipt.PostState) > 0 {
fields["root"] = hexutil.Bytes(receipt.PostState)
} else {
fields["status"] = hexutil.Uint(receipt.Status)
}
if receipt.Logs == nil {
fields["logs"] = [][]*types.Log{}
}
// If the ContractAddress is 20 0x0 bytes, assume it is not a contract creation
if receipt.ContractAddress != (common.Address{}) {
fields["contractAddress"] = receipt.ContractAddress
}
return fields, nil
}
// sign is a helper function that signs a transaction with the private key of the given address.
func (s *PublicTransactionPoolAPI) sign(addr common.Address, tx *types.Transaction) (*types.Transaction, error) {
// Look up the wallet containing the requested signer
account := accounts.Account{Address: addr}
wallet, err := s.b.AccountManager().Find(account)
if err != nil {
return nil, err
}
// Request the wallet to sign the transaction
return wallet.SignTx(account, tx, s.b.ChainConfig().ChainID)
}
// SendTxArgs represents the arguments to sumbit a new transaction into the transaction pool.
type SendTxArgs struct {
From common.Address `json:"from"`
To *common.Address `json:"to"`
Gas *hexutil.Uint64 `json:"gas"`
GasPrice *hexutil.Big `json:"gasPrice"`
Value *hexutil.Big `json:"value"`
Nonce *hexutil.Uint64 `json:"nonce"`
// We accept "data" and "input" for backwards-compatibility reasons. "input" is the
// newer name and should be preferred by clients.
Data *hexutil.Bytes `json:"data"`
Input *hexutil.Bytes `json:"input"`
}
// setDefaults is a helper function that fills in default values for unspecified tx fields.
func (args *SendTxArgs) setDefaults(ctx context.Context, b Backend) error {
if args.GasPrice == nil {
price, err := b.SuggestPrice(ctx)
if err != nil {
return err
}
args.GasPrice = (*hexutil.Big)(price)
}
if args.Value == nil {
args.Value = new(hexutil.Big)
}
if args.Nonce == nil {
nonce, err := b.GetPoolNonce(ctx, args.From)
if err != nil {
return err
}
args.Nonce = (*hexutil.Uint64)(&nonce)
}
if args.Data != nil && args.Input != nil && !bytes.Equal(*args.Data, *args.Input) {
return errors.New(`both "data" and "input" are set and not equal. Please use "input" to pass transaction call data.`)
}
if args.To == nil {
// Contract creation
var input []byte
if args.Data != nil {
input = *args.Data
} else if args.Input != nil {
input = *args.Input
}
if len(input) == 0 {
return errors.New(`contract creation without any data provided`)
}
}
// Estimate the gas usage if necessary.
if args.Gas == nil {
// For backwards-compatibility reason, we try both input and data
// but input is preferred.
input := args.Input
if input == nil {
input = args.Data
}
callArgs := CallArgs{
From: &args.From, // From shouldn't be nil
To: args.To,
GasPrice: args.GasPrice,
Value: args.Value,
Data: input,
}
latestBlockNr := rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber)
estimated, err := DoEstimateGas(ctx, b, callArgs, latestBlockNr, b.RPCGasCap())
if err != nil {
return err
}
args.Gas = &estimated
log.Trace("Estimate gas usage automatically", "gas", args.Gas)
}
return nil
}
func (args *SendTxArgs) toTransaction() *types.Transaction {
var input []byte
if args.Input != nil {
input = *args.Input
} else if args.Data != nil {
input = *args.Data
}
if args.To == nil {
return types.NewContractCreation(uint64(*args.Nonce), (*big.Int)(args.Value), uint64(*args.Gas), (*big.Int)(args.GasPrice), input)
}
return types.NewTransaction(uint64(*args.Nonce), *args.To, (*big.Int)(args.Value), uint64(*args.Gas), (*big.Int)(args.GasPrice), input)
}
// SubmitTransaction is a helper function that submits tx to txPool and logs a message.
func SubmitTransaction(ctx context.Context, b Backend, tx *types.Transaction) (common.Hash, error) {
// If the transaction fee cap is already specified, ensure the
// fee of the given transaction is _reasonable_.
if err := checkTxFee(tx.GasPrice(), tx.Gas(), b.RPCTxFeeCap()); err != nil {
return common.Hash{}, err
}
if err := b.SendTx(ctx, tx); err != nil {
return common.Hash{}, err
}
if tx.To() == nil {
signer := types.MakeSigner(b.ChainConfig(), b.CurrentBlock().Number)
from, err := types.Sender(signer, tx)
if err != nil {
return common.Hash{}, err
}
addr := crypto.CreateAddress(from, tx.Nonce())
log.Info("Submitted contract creation", "fullhash", tx.Hash().Hex(), "contract", addr.Hex())
} else {
log.Info("Submitted transaction", "fullhash", tx.Hash().Hex(), "recipient", tx.To())
}
return tx.Hash(), nil
}
// SendTransaction creates a transaction for the given argument, sign it and submit it to the
// transaction pool.
func (s *PublicTransactionPoolAPI) SendTransaction(ctx context.Context, args SendTxArgs) (common.Hash, error) {
// Look up the wallet containing the requested signer
account := accounts.Account{Address: args.From}
wallet, err := s.b.AccountManager().Find(account)
if err != nil {
return common.Hash{}, err
}
if args.Nonce == nil {
// Hold the addresse's mutex around signing to prevent concurrent assignment of
// the same nonce to multiple accounts.
s.nonceLock.LockAddr(args.From)
defer s.nonceLock.UnlockAddr(args.From)
}
// Set some sanity defaults and terminate on failure
if err := args.setDefaults(ctx, s.b); err != nil {
return common.Hash{}, err
}
// Assemble the transaction and sign with the wallet
tx := args.toTransaction()
signed, err := wallet.SignTx(account, tx, s.b.ChainConfig().ChainID)
if err != nil {
return common.Hash{}, err
}
return SubmitTransaction(ctx, s.b, signed)
}
// FillTransaction fills the defaults (nonce, gas, gasPrice) on a given unsigned transaction,
// and returns it to the caller for further processing (signing + broadcast)
func (s *PublicTransactionPoolAPI) FillTransaction(ctx context.Context, args SendTxArgs) (*SignTransactionResult, error) {
// Set some sanity defaults and terminate on failure
if err := args.setDefaults(ctx, s.b); err != nil {
return nil, err
}
// Assemble the transaction and obtain rlp
tx := args.toTransaction()
data, err := rlp.EncodeToBytes(tx)
if err != nil {
return nil, err
}
return &SignTransactionResult{data, tx}, nil
}
// SendRawTransaction will add the signed transaction to the transaction pool.
// The sender is responsible for signing the transaction and using the correct nonce.
func (s *PublicTransactionPoolAPI) SendRawTransaction(ctx context.Context, encodedTx hexutil.Bytes) (common.Hash, error) {
tx := new(types.Transaction)
if err := rlp.DecodeBytes(encodedTx, tx); err != nil {
return common.Hash{}, err
}
return SubmitTransaction(ctx, s.b, tx)
}
// Sign calculates an ECDSA signature for:
// keccack256("\x19Ethereum Signed Message:\n" + len(message) + message).
//
// Note, the produced signature conforms to the secp256k1 curve R, S and V values,
// where the V value will be 27 or 28 for legacy reasons.
//
// The account associated with addr must be unlocked.
//
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign
func (s *PublicTransactionPoolAPI) Sign(addr common.Address, data hexutil.Bytes) (hexutil.Bytes, error) {
// Look up the wallet containing the requested signer
account := accounts.Account{Address: addr}
wallet, err := s.b.AccountManager().Find(account)
if err != nil {
return nil, err
}
// Sign the requested hash with the wallet
signature, err := wallet.SignText(account, data)
if err == nil {
signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
}
return signature, err
}
// SignTransactionResult represents a RLP encoded signed transaction.
type SignTransactionResult struct {
Raw hexutil.Bytes `json:"raw"`
Tx *types.Transaction `json:"tx"`
}
// SignTransaction will sign the given transaction with the from account.
// The node needs to have the private key of the account corresponding with
// the given from address and it needs to be unlocked.
func (s *PublicTransactionPoolAPI) SignTransaction(ctx context.Context, args SendTxArgs) (*SignTransactionResult, error) {
if args.Gas == nil {
return nil, fmt.Errorf("gas not specified")
}
if args.GasPrice == nil {
return nil, fmt.Errorf("gasPrice not specified")
}
if args.Nonce == nil {
return nil, fmt.Errorf("nonce not specified")
}
if err := args.setDefaults(ctx, s.b); err != nil {
return nil, err
}
// Before actually sign the transaction, ensure the transaction fee is reasonable.
if err := checkTxFee(args.GasPrice.ToInt(), uint64(*args.Gas), s.b.RPCTxFeeCap()); err != nil {
return nil, err
}
tx, err := s.sign(args.From, args.toTransaction())
if err != nil {
return nil, err
}
data, err := rlp.EncodeToBytes(tx)
if err != nil {
return nil, err
}
return &SignTransactionResult{data, tx}, nil
}
// PendingTransactions returns the transactions that are in the transaction pool
// and have a from address that is one of the accounts this node manages.
func (s *PublicTransactionPoolAPI) PendingTransactions() ([]*RPCTransaction, error) {
pending, err := s.b.GetPoolTransactions()
if err != nil {
return nil, err
}
accounts := make(map[common.Address]struct{})
for _, wallet := range s.b.AccountManager().Wallets() {
for _, account := range wallet.Accounts() {
accounts[account.Address] = struct{}{}
}
}
transactions := make([]*RPCTransaction, 0, len(pending))
for _, tx := range pending {
var signer types.Signer = types.HomesteadSigner{}
if tx.Protected() {
signer = types.NewEIP155Signer(tx.ChainId())
}
from, _ := types.Sender(signer, tx)
if _, exists := accounts[from]; exists {
transactions = append(transactions, newRPCPendingTransaction(tx))
}
}
return transactions, nil
}
// Resend accepts an existing transaction and a new gas price and limit. It will remove
// the given transaction from the pool and reinsert it with the new gas price and limit.
func (s *PublicTransactionPoolAPI) Resend(ctx context.Context, sendArgs SendTxArgs, gasPrice *hexutil.Big, gasLimit *hexutil.Uint64) (common.Hash, error) {
if sendArgs.Nonce == nil {
return common.Hash{}, fmt.Errorf("missing transaction nonce in transaction spec")
}
if err := sendArgs.setDefaults(ctx, s.b); err != nil {
return common.Hash{}, err
}
matchTx := sendArgs.toTransaction()
// Before replacing the old transaction, ensure the _new_ transaction fee is reasonable.
var price = matchTx.GasPrice()
if gasPrice != nil {
price = gasPrice.ToInt()
}
var gas = matchTx.Gas()
if gasLimit != nil {
gas = uint64(*gasLimit)
}
if err := checkTxFee(price, gas, s.b.RPCTxFeeCap()); err != nil {
return common.Hash{}, err
}
// Iterate the pending list for replacement
pending, err := s.b.GetPoolTransactions()
if err != nil {
return common.Hash{}, err
}
for _, p := range pending {
var signer types.Signer = types.HomesteadSigner{}
if p.Protected() {
signer = types.NewEIP155Signer(p.ChainId())
}
wantSigHash := signer.Hash(matchTx)
if pFrom, err := types.Sender(signer, p); err == nil && pFrom == sendArgs.From && signer.Hash(p) == wantSigHash {
// Match. Re-sign and send the transaction.
if gasPrice != nil && (*big.Int)(gasPrice).Sign() != 0 {
sendArgs.GasPrice = gasPrice
}
if gasLimit != nil && *gasLimit != 0 {
sendArgs.Gas = gasLimit
}
signedTx, err := s.sign(sendArgs.From, sendArgs.toTransaction())
if err != nil {
return common.Hash{}, err
}
if err = s.b.SendTx(ctx, signedTx); err != nil {
return common.Hash{}, err
}
return signedTx.Hash(), nil
}
}
return common.Hash{}, fmt.Errorf("transaction %#x not found", matchTx.Hash())
}
// PublicDebugAPI is the collection of Ethereum APIs exposed over the public
// debugging endpoint.
type PublicDebugAPI struct {
b Backend
}
// NewPublicDebugAPI creates a new API definition for the public debug methods
// of the Ethereum service.
func NewPublicDebugAPI(b Backend) *PublicDebugAPI {
return &PublicDebugAPI{b: b}
}
// GetBlockRlp retrieves the RLP encoded for of a single block.
func (api *PublicDebugAPI) GetBlockRlp(ctx context.Context, number uint64) (string, error) {
block, _ := api.b.BlockByNumber(ctx, rpc.BlockNumber(number))
if block == nil {
return "", fmt.Errorf("block #%d not found", number)
}
encoded, err := rlp.EncodeToBytes(block)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", encoded), nil
}
// TestSignCliqueBlock fetches the given block number, and attempts to sign it as a clique header with the
// given address, returning the address of the recovered signature
//
// This is a temporary method to debug the externalsigner integration,
func (api *PublicDebugAPI) TestSignCliqueBlock(ctx context.Context, address common.Address, number uint64) (common.Address, error) {
return common.Address{}, errors.New("Clique isn't supported")
}
// PrintBlock retrieves a block and returns its pretty printed form.
func (api *PublicDebugAPI) PrintBlock(ctx context.Context, number uint64) (string, error) {
block, err := api.b.BlockByNumber(ctx, rpc.BlockNumber(number))
if err != nil {
return "", err
}
if block == nil {
return "", fmt.Errorf("block #%d not found", number)
}
return spew.Sdump(block), nil
}
// SeedHash retrieves the seed hash of a block.
func (api *PublicDebugAPI) SeedHash(ctx context.Context, number uint64) (string, error) {
block, err := api.b.BlockByNumber(ctx, rpc.BlockNumber(number))
if err != nil {
return "", err
}
if block == nil {
return "", fmt.Errorf("block #%d not found", number)
}
return fmt.Sprintf("0x%x", ethash.SeedHash(number)), nil
}
// BlocksTransactionTimes returns the map time => number of transactions
// This data may be used to draw a histogram to calculate a peak TPS of a range of blocks
func (api *PublicDebugAPI) BlocksTransactionTimes(ctx context.Context, untilBlock rpc.BlockNumber, maxBlocks hexutil.Uint64) (map[hexutil.Uint64]hexutil.Uint, error) {
until, err := api.b.HeaderByNumber(ctx, untilBlock)
if err != nil {
return nil, err
}
untilN := until.Number.Uint64()
times := map[hexutil.Uint64]hexutil.Uint{}
for i := untilN; i >= 1 && i+uint64(maxBlocks) > untilN; i-- {
b, err := api.b.BlockByNumber(ctx, rpc.BlockNumber(i))
if err != nil {
return nil, err
}
if b.Transactions.Len() == 0 {
continue
}
times[hexutil.Uint64(b.Time)] += hexutil.Uint(b.Transactions.Len())
}
return times, nil
}
// PrivateDebugAPI is the collection of Ethereum APIs exposed over the private
// debugging endpoint.
type PrivateDebugAPI struct {
b Backend
}
// NewPrivateDebugAPI creates a new API definition for the private debug methods
// of the Ethereum service.
func NewPrivateDebugAPI(b Backend) *PrivateDebugAPI {
return &PrivateDebugAPI{b: b}
}
// ChaindbProperty returns leveldb properties of the key-value database.
func (api *PrivateDebugAPI) ChaindbProperty(property string) (string, error) {
if property == "" {
property = "leveldb.stats"
} else if !strings.HasPrefix(property, "leveldb.") {
property = "leveldb." + property
}
return api.b.ChainDb().Stat(property)
}
// ChaindbCompact flattens the entire key-value database into a single level,
// removing all unused slots and merging all keys.
func (api *PrivateDebugAPI) ChaindbCompact() error {
for b := byte(0); b < 255; b++ {
log.Info("Compacting chain database", "range", fmt.Sprintf("0x%0.2X-0x%0.2X", b, b+1))
if err := api.b.ChainDb().Compact([]byte{b}, []byte{b + 1}); err != nil {
log.Error("Database compaction failed", "err", err)
return err
}
}
return nil
}
// SetHead rewinds the head of the blockchain to a previous block.
func (api *PrivateDebugAPI) SetHead(number hexutil.Uint64) error {
return errors.New("lachesis cannot rewind blocks due to the BFT algorithm")
}
// PublicNetAPI offers network related RPC methods
type PublicNetAPI struct {
net *p2p.Server
networkVersion uint64
}
// NewPublicNetAPI creates a new net API instance.
func NewPublicNetAPI(net *p2p.Server, networkVersion uint64) *PublicNetAPI {
return &PublicNetAPI{net, networkVersion}
}
// Listening returns an indication if the node is listening for network connections.
func (s *PublicNetAPI) Listening() bool {
return true // always listening
}
// PeerCount returns the number of connected peers
func (s *PublicNetAPI) PeerCount() hexutil.Uint {
return hexutil.Uint(s.net.PeerCount())
}
// Version returns the current ethereum protocol version.
func (s *PublicNetAPI) Version() string {
return fmt.Sprintf("%d", s.networkVersion)
}
// checkTxFee is an internal function used to check whether the fee of
// the given transaction is _reasonable_(under the cap).
func checkTxFee(gasPrice *big.Int, gas uint64, cap float64) error {
// Short circuit if there is no cap for transaction fee at all.
if cap == 0 {
return nil
}
feeEth := new(big.Float).Quo(new(big.Float).SetInt(new(big.Int).Mul(gasPrice, new(big.Int).SetUint64(gas))), new(big.Float).SetInt(big.NewInt(params.Ether)))
feeFloat, _ := feeEth.Float64()
if feeFloat > cap {
return fmt.Errorf("tx fee (%.2f FTM) exceeds the configured cap (%.2f FTM)", feeFloat, cap)
}
return nil
}