Refactored state transitioning to its own model
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obscuren
@@ -7,6 +7,17 @@ import (
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"math/big"
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)
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func (sm *StateManager) MakeStateObject(state *State, tx *Transaction) *StateObject {
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contract := MakeContract(tx, state)
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if contract != nil {
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state.states[string(tx.CreationAddress())] = contract.state
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return contract
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}
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return nil
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}
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func (sm *StateManager) EvalScript(state *State, script []byte, object *StateObject, tx *Transaction, block *Block) (ret []byte, gas *big.Int, err error) {
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account := state.GetAccount(tx.Sender())
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@@ -97,182 +97,6 @@ func (sm *StateManager) BlockChain() *BlockChain {
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return sm.bc
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}
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func (sm *StateManager) MakeStateObject(state *State, tx *Transaction) *StateObject {
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contract := MakeContract(tx, state)
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if contract != nil {
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state.states[string(tx.CreationAddress())] = contract.state
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return contract
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}
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return nil
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}
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type StateTransition struct {
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coinbase []byte
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tx *Transaction
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gas *big.Int
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state *State
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block *Block
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cb, rec, sen *StateObject
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}
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func NewStateTransition(coinbase []byte, gas *big.Int, tx *Transaction, state *State, block *Block) *StateTransition {
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return &StateTransition{coinbase, tx, new(big.Int), state, block, nil, nil, nil}
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}
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func (self *StateTransition) Coinbase() *StateObject {
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if self.cb != nil {
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return self.cb
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}
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self.cb = self.state.GetAccount(self.coinbase)
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return self.cb
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}
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func (self *StateTransition) Sender() *StateObject {
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if self.sen != nil {
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return self.sen
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}
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self.sen = self.state.GetAccount(self.tx.Sender())
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return self.sen
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}
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func (self *StateTransition) Receiver() *StateObject {
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if self.tx.CreatesContract() {
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return nil
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}
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if self.rec != nil {
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return self.rec
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}
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self.rec = self.state.GetAccount(self.tx.Recipient)
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return self.rec
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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.Sender()
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if sender.Amount.Cmp(self.tx.GasValue()) < 0 {
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return fmt.Errorf("Insufficient funds to pre-pay gas. Req %v, has %v", self.tx.GasValue(), self.tx.Value)
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}
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coinbase := self.Coinbase()
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err = coinbase.BuyGas(self.tx.Gas, self.tx.GasPrice)
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if err != nil {
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return err
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}
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self.state.UpdateStateObject(coinbase)
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self.AddGas(self.tx.Gas)
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sender.SubAmount(self.tx.GasValue())
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return nil
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}
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func (self *StateManager) TransitionState(st *StateTransition) (err error) {
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//snapshot := st.state.Snapshot()
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defer func() {
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if r := recover(); r != nil {
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ethutil.Config.Log.Infoln(r)
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err = fmt.Errorf("%v", r)
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}
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}()
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var (
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tx = st.tx
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sender = st.Sender()
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receiver *StateObject
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)
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if sender.Nonce != tx.Nonce {
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return NonceError(tx.Nonce, sender.Nonce)
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}
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sender.Nonce += 1
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defer func() {
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// Notify all subscribers
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self.Ethereum.Reactor().Post("newTx:post", tx)
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}()
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if err = st.BuyGas(); err != nil {
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return err
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}
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receiver = st.Receiver()
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if err = st.UseGas(GasTx); err != nil {
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return err
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}
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dataPrice := big.NewInt(int64(len(tx.Data)))
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dataPrice.Mul(dataPrice, GasData)
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if err = st.UseGas(dataPrice); err != nil {
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return err
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}
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if receiver == nil { // Contract
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receiver = self.MakeStateObject(st.state, tx)
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if receiver == nil {
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return fmt.Errorf("ERR. Unable to create contract with transaction %v", tx)
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}
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}
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if err = self.transferValue(st, sender, receiver); err != nil {
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return err
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}
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if tx.CreatesContract() {
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fmt.Println(Disassemble(receiver.Init()))
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// Evaluate the initialization script
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// and use the return value as the
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// script section for the state object.
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//script, gas, err = sm.Eval(state, contract.Init(), contract, tx, block)
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code, err := self.Eval(st, receiver.Init(), receiver)
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if err != nil {
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return fmt.Errorf("Error during init script run %v", err)
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}
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receiver.script = code
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}
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st.state.UpdateStateObject(sender)
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st.state.UpdateStateObject(receiver)
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return nil
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}
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func (self *StateManager) transferValue(st *StateTransition, sender, receiver *StateObject) error {
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if sender.Amount.Cmp(st.tx.Value) < 0 {
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return fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", st.tx.Value, sender.Amount)
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}
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// Subtract the amount from the senders account
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sender.SubAmount(st.tx.Value)
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// Add the amount to receivers account which should conclude this transaction
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receiver.AddAmount(st.tx.Value)
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ethutil.Config.Log.Debugf("%x => %x (%v) %x\n", sender.Address()[:4], receiver.Address()[:4], st.tx.Value, st.tx.Hash())
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return nil
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}
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func (self *StateManager) ProcessTransactions(coinbase []byte, state *State, block, parent *Block, txs Transactions) (Receipts, Transactions, Transactions, error) {
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var (
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receipts Receipts
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@@ -284,8 +108,8 @@ func (self *StateManager) ProcessTransactions(coinbase []byte, state *State, blo
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done:
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for i, tx := range txs {
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txGas := new(big.Int).Set(tx.Gas)
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st := NewStateTransition(coinbase, tx.Gas, tx, state, block)
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err = self.TransitionState(st)
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st := NewStateTransition(coinbase, tx, state, block)
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err = st.TransitionState()
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if err != nil {
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switch {
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case IsNonceErr(err):
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@@ -315,28 +139,6 @@ done:
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return receipts, handled, unhandled, err
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}
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func (self *StateManager) Eval(st *StateTransition, script []byte, context *StateObject) (ret []byte, err error) {
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var (
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tx = st.tx
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block = st.block
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initiator = st.Sender()
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)
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closure := NewClosure(initiator, context, script, st.state, st.gas, tx.GasPrice)
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vm := NewVm(st.state, self, RuntimeVars{
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Origin: initiator.Address(),
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BlockNumber: block.BlockInfo().Number,
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PrevHash: block.PrevHash,
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Coinbase: block.Coinbase,
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Time: block.Time,
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Diff: block.Difficulty,
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Value: tx.Value,
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})
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ret, _, err = closure.Call(vm, tx.Data, nil)
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return
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}
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func (sm *StateManager) Process(block *Block, dontReact bool) error {
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if !sm.bc.HasBlock(block.PrevHash) {
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return ParentError(block.PrevHash)
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