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