package types
import (
"crypto/ecdsa"
"errors"
"fmt"
"io"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/rlp"
)
func IsContractAddr(addr []byte) bool {
return len(addr) == 0
}
type Transaction struct {
data txdata
}
type txdata struct {
AccountNonce uint64
Price, GasLimit *big.Int
Recipient *common.Address `rlp:"nil"` // nil means contract creation
Amount *big.Int
Payload []byte
V byte // signature
R, S *big.Int // signature
}
func NewContractCreation(nonce uint64, amount, gasLimit, gasPrice *big.Int, data []byte) *Transaction {
if len(data) > 0 {
data = common.CopyBytes(data)
}
return &Transaction{data: txdata{
AccountNonce: nonce,
Recipient: nil,
Amount: new(big.Int).Set(amount),
GasLimit: new(big.Int).Set(gasLimit),
Price: new(big.Int).Set(gasPrice),
Payload: data,
R: new(big.Int),
S: new(big.Int),
}}
}
func NewTransaction(nonce uint64, to common.Address, amount, gasLimit, gasPrice *big.Int, data []byte) *Transaction {
if len(data) > 0 {
data = common.CopyBytes(data)
}
d := txdata{
AccountNonce: nonce,
Recipient: &to,
Payload: data,
Amount: new(big.Int),
GasLimit: new(big.Int),
Price: new(big.Int),
R: new(big.Int),
S: new(big.Int),
}
if amount != nil {
d.Amount.Set(amount)
}
if gasLimit != nil {
d.GasLimit.Set(gasLimit)
}
if gasPrice != nil {
d.Price.Set(gasPrice)
}
return &Transaction{data: d}
}
func NewTransactionFromBytes(data []byte) *Transaction {
// TODO: remove this function if possible. callers would
// much better off decoding into transaction directly.
// it's not that hard.
tx := new(Transaction)
rlp.DecodeBytes(data, tx)
return tx
}
func (tx *Transaction) EncodeRLP(w io.Writer) error {
return rlp.Encode(w, &tx.data)
}
func (tx *Transaction) DecodeRLP(s *rlp.Stream) error {
return s.Decode(&tx.data)
}
func (tx *Transaction) Data() []byte { return common.CopyBytes(tx.data.Payload) }
func (tx *Transaction) Gas() *big.Int { return new(big.Int).Set(tx.data.GasLimit) }
func (tx *Transaction) GasPrice() *big.Int { return new(big.Int).Set(tx.data.Price) }
func (tx *Transaction) Value() *big.Int { return new(big.Int).Set(tx.data.Amount) }
func (tx *Transaction) Nonce() uint64 { return tx.data.AccountNonce }
func (tx *Transaction) To() *common.Address {
if tx.data.Recipient == nil {
return nil
} else {
to := *tx.data.Recipient
return &to
}
}
func (tx *Transaction) Hash() common.Hash {
v := rlpHash([]interface{}{
tx.data.AccountNonce,
tx.data.Price,
tx.data.GasLimit,
tx.data.Recipient,
tx.data.Amount,
tx.data.Payload,
})
return v
}
func (tx *Transaction) Size() common.StorageSize {
v, _, _ := rlp.EncodeToReader(&tx.data)
return common.StorageSize(v)
}
func (tx *Transaction) From() (common.Address, error) {
pubkey, err := tx.PublicKey()
if err != nil {
return common.Address{}, err
}
var addr common.Address
copy(addr[:], crypto.Sha3(pubkey[1:])[12:])
return addr, nil
}
// Cost returns amount + gasprice * gaslimit.
func (tx *Transaction) Cost() *big.Int {
total := new(big.Int).Mul(tx.data.Price, tx.data.GasLimit)
total.Add(total, tx.data.Amount)
return total
}
func (tx *Transaction) SignatureValues() (v byte, r *big.Int, s *big.Int) {
return tx.data.V, new(big.Int).Set(tx.data.R), new(big.Int).Set(tx.data.S)
}
func (tx *Transaction) PublicKey() ([]byte, error) {
if !crypto.ValidateSignatureValues(tx.data.V, tx.data.R, tx.data.S) {
return nil, errors.New("invalid v, r, s values")
}
// encode the signature in uncompressed format
r, s := tx.data.R.Bytes(), tx.data.S.Bytes()
sig := make([]byte, 65)
copy(sig[32-len(r):32], r)
copy(sig[64-len(s):64], s)
sig[64] = tx.data.V - 27
// recover the public key from the signature
hash := tx.Hash()
pub, err := crypto.Ecrecover(hash[:], sig)
if err != nil {
glog.V(logger.Error).Infof("Could not get pubkey from signature: ", err)
return nil, err
}
if len(pub) == 0 || pub[0] != 4 {
return nil, errors.New("invalid public key")
}
return pub, nil
}
func (tx *Transaction) WithSignature(sig []byte) (*Transaction, error) {
if len(sig) != 65 {
panic(fmt.Sprintf("wrong size for signature: got %d, want 65", len(sig)))
}
cpy := &Transaction{data: tx.data}
cpy.data.R = new(big.Int).SetBytes(sig[:32])
cpy.data.S = new(big.Int).SetBytes(sig[32:64])
cpy.data.V = sig[64] + 27
return cpy, nil
}
func (tx *Transaction) SignECDSA(prv *ecdsa.PrivateKey) (*Transaction, error) {
h := tx.Hash()
sig, err := crypto.Sign(h[:], prv)
if err != nil {
return nil, err
}
return tx.WithSignature(sig)
}
func (tx *Transaction) String() string {
var from, to string
if f, err := tx.From(); err != nil {
from = "[invalid sender]"
} else {
from = fmt.Sprintf("%x", f[:])
}
if tx.data.Recipient == nil {
to = "[contract creation]"
} else {
to = fmt.Sprintf("%x", tx.data.Recipient[:])
}
enc, _ := rlp.EncodeToBytes(&tx.data)
return fmt.Sprintf(`
TX(%x)
Contract: %v
From: %s
To: %s
Nonce: %v
GasPrice: %v
GasLimit %v
Value: %v
Data: 0x%x
V: 0x%x
R: 0x%x
S: 0x%x
Hex: %x
`,
tx.Hash(),
len(tx.data.Recipient) == 0,
from,
to,
tx.data.AccountNonce,
tx.data.Price,
tx.data.GasLimit,
tx.data.Amount,
tx.data.Payload,
tx.data.V,
tx.data.R,
tx.data.S,
enc,
)
}
// Transaction slice type for basic sorting.
type Transactions []*Transaction
func (s Transactions) Len() int { return len(s) }
func (s Transactions) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s Transactions) GetRlp(i int) []byte {
enc, _ := rlp.EncodeToBytes(s[i])
return enc
}
type TxByNonce struct{ Transactions }
func (s TxByNonce) Less(i, j int) bool {
return s.Transactions[i].data.AccountNonce < s.Transactions[j].data.AccountNonce
}
