plugeth/core/state_transition.go

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package core
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/state"
"github.com/ethereum/go-ethereum/vm"
)
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const tryJit = false
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var (
GasTx = big.NewInt(21000)
GasTxNonZeroByte = big.NewInt(37)
GasTxZeroByte = big.NewInt(2)
)
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/*
* The State transitioning model
*
* A state transition is a change made when a transaction is applied to the current world state
* The state transitioning model does all all the necessary work to work out a valid new state root.
* 1) Nonce handling
* 2) Pre pay / buy gas of the coinbase (miner)
* 3) Create a new state object if the recipient is \0*32
* 4) Value transfer
* == If contract creation ==
* 4a) Attempt to run transaction data
* 4b) If valid, use result as code for the new state object
* == end ==
* 5) Run Script section
* 6) Derive new state root
*/
type StateTransition struct {
coinbase []byte
msg Message
gas, gasPrice *big.Int
initialGas *big.Int
value *big.Int
data []byte
state *state.StateDB
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cb, rec, sen *state.StateObject
env vm.Environment
}
type Message interface {
Hash() []byte
From() []byte
To() []byte
GasPrice() *big.Int
Gas() *big.Int
Value() *big.Int
Nonce() uint64
Data() []byte
}
func AddressFromMessage(msg Message) []byte {
// Generate a new address
return crypto.Sha3(ethutil.NewValue([]interface{}{msg.From(), msg.Nonce()}).Encode())[12:]
}
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func MessageCreatesContract(msg Message) bool {
return len(msg.To()) == 0
}
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func MessageGasValue(msg Message) *big.Int {
return new(big.Int).Mul(msg.Gas(), msg.GasPrice())
}
func NewStateTransition(env vm.Environment, msg Message, coinbase *state.StateObject) *StateTransition {
return &StateTransition{
coinbase: coinbase.Address(),
env: env,
msg: msg,
gas: new(big.Int),
gasPrice: new(big.Int).Set(msg.GasPrice()),
initialGas: new(big.Int),
value: msg.Value(),
data: msg.Data(),
state: env.State(),
cb: coinbase,
}
}
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func (self *StateTransition) Coinbase() *state.StateObject {
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return self.state.GetOrNewStateObject(self.coinbase)
}
func (self *StateTransition) From() *state.StateObject {
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return self.state.GetOrNewStateObject(self.msg.From())
}
func (self *StateTransition) To() *state.StateObject {
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if self.msg != nil && MessageCreatesContract(self.msg) {
return nil
}
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return self.state.GetOrNewStateObject(self.msg.To())
}
func (self *StateTransition) UseGas(amount *big.Int) error {
if self.gas.Cmp(amount) < 0 {
return OutOfGasError()
}
self.gas.Sub(self.gas, amount)
return nil
}
func (self *StateTransition) AddGas(amount *big.Int) {
self.gas.Add(self.gas, amount)
}
func (self *StateTransition) BuyGas() error {
var err error
sender := self.From()
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if sender.Balance().Cmp(MessageGasValue(self.msg)) < 0 {
return fmt.Errorf("insufficient ETH for gas (%x). Req %v, has %v", sender.Address()[:4], MessageGasValue(self.msg), sender.Balance())
}
coinbase := self.Coinbase()
err = coinbase.BuyGas(self.msg.Gas(), self.msg.GasPrice())
if err != nil {
return err
}
self.AddGas(self.msg.Gas())
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self.initialGas.Set(self.msg.Gas())
sender.SubBalance(MessageGasValue(self.msg))
return nil
}
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func (self *StateTransition) preCheck() (err error) {
var (
msg = self.msg
sender = self.From()
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)
// Make sure this transaction's nonce is correct
if sender.Nonce() != msg.Nonce() {
return NonceError(msg.Nonce(), sender.Nonce())
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}
// Pre-pay gas / Buy gas of the coinbase account
if err = self.BuyGas(); err != nil {
return err
}
return nil
}
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func (self *StateTransition) TransitionState() (ret []byte, err error) {
statelogger.Debugf("(~) %x\n", self.msg.Hash())
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// XXX Transactions after this point are considered valid.
if err = self.preCheck(); err != nil {
return
}
var (
msg = self.msg
sender = self.From()
)
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defer self.RefundGas()
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// Increment the nonce for the next transaction
self.state.SetNonce(sender.Address(), sender.Nonce()+1)
//sender.Nonce += 1
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// Transaction gas
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if err = self.UseGas(GasTx); err != nil {
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return
}
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// Pay data gas
var dgas int64
for _, byt := range self.data {
if byt != 0 {
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dgas += GasTxNonZeroByte.Int64()
} else {
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dgas += GasTxZeroByte.Int64()
}
}
if err = self.UseGas(big.NewInt(dgas)); err != nil {
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return
}
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//stateCopy := self.env.State().Copy()
vmenv := self.env
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var ref vm.ContextRef
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if MessageCreatesContract(msg) {
contract := MakeContract(msg, self.state)
ret, err, ref = vmenv.Create(sender, contract.Address(), self.msg.Data(), self.gas, self.gasPrice, self.value)
if err == nil {
dataGas := big.NewInt(int64(len(ret)))
dataGas.Mul(dataGas, vm.GasCreateByte)
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if err := self.UseGas(dataGas); err == nil {
ref.SetCode(ret)
}
}
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/*
if vmenv, ok := vmenv.(*VMEnv); ok && tryJit {
statelogger.Infof("CREATE: re-running using JIT (PH=%x)\n", stateCopy.Root()[:4])
// re-run using the JIT (validation for the JIT)
goodState := vmenv.State().Copy()
vmenv.state = stateCopy
vmenv.SetVmType(vm.JitVmTy)
vmenv.Create(sender, contract.Address(), self.msg.Data(), self.gas, self.gasPrice, self.value)
statelogger.Infof("DONE PH=%x STD_H=%x JIT_H=%x\n", stateCopy.Root()[:4], goodState.Root()[:4], vmenv.State().Root()[:4])
self.state.Set(goodState)
}
*/
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} else {
ret, err = vmenv.Call(self.From(), self.To().Address(), self.msg.Data(), self.gas, self.gasPrice, self.value)
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/*
if vmenv, ok := vmenv.(*VMEnv); ok && tryJit {
statelogger.Infof("CALL: re-running using JIT (PH=%x)\n", stateCopy.Root()[:4])
// re-run using the JIT (validation for the JIT)
goodState := vmenv.State().Copy()
vmenv.state = stateCopy
vmenv.SetVmType(vm.JitVmTy)
vmenv.Call(self.From(), self.To().Address(), self.msg.Data(), self.gas, self.gasPrice, self.value)
statelogger.Infof("DONE PH=%x STD_H=%x JIT_H=%x\n", stateCopy.Root()[:4], goodState.Root()[:4], vmenv.State().Root()[:4])
self.state.Set(goodState)
}
*/
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}
if err != nil {
self.UseGas(self.gas)
}
return
}
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// Converts an transaction in to a state object
func MakeContract(msg Message, state *state.StateDB) *state.StateObject {
addr := AddressFromMessage(msg)
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contract := state.GetOrNewStateObject(addr)
contract.SetInitCode(msg.Data())
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return contract
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}
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func (self *StateTransition) RefundGas() {
coinbase, sender := self.Coinbase(), self.From()
// Return remaining gas
remaining := new(big.Int).Mul(self.gas, self.msg.GasPrice())
sender.AddBalance(remaining)
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uhalf := new(big.Int).Div(self.GasUsed(), ethutil.Big2)
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for addr, ref := range self.state.Refunds() {
refund := ethutil.BigMin(uhalf, ref)
self.gas.Add(self.gas, refund)
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self.state.AddBalance([]byte(addr), refund.Mul(refund, self.msg.GasPrice()))
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}
coinbase.RefundGas(self.gas, self.msg.GasPrice())
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}
func (self *StateTransition) GasUsed() *big.Int {
return new(big.Int).Sub(self.initialGas, self.gas)
}