mirror of https://github.com/poanetwork/quorum.git
235 lines
5.7 KiB
Go
235 lines
5.7 KiB
Go
package ethchain
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import (
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"fmt"
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"github.com/ethereum/eth-go/ethutil"
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"math/big"
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)
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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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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, 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) 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 (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 *StateTransition) TransitionState() (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("state transition err %v", r)
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}
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}()
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var (
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tx = self.tx
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sender = self.Sender()
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receiver *StateObject
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)
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// Make sure this transaction's nonce is correct
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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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// Increment the nonce for the next transaction
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sender.Nonce += 1
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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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// Get the receiver (TODO fix this, if coinbase is the receiver we need to save/retrieve)
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receiver = self.Receiver()
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// Transaction gas
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if err = self.UseGas(GasTx); err != nil {
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return err
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}
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// Pay data gas
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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 = self.UseGas(dataPrice); err != nil {
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return err
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}
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// If the receiver is nil it's a contract (\0*32).
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if receiver == nil {
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// Create a new state object for the contract
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receiver = self.MakeStateObject(self.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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// Transfer value from sender to receiver
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if err = self.transferValue(sender, receiver); err != nil {
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return err
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}
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// Process the init code and create 'valid' contract
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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(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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// Return remaining gas
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remaining := new(big.Int).Mul(self.gas, tx.GasPrice)
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sender.AddAmount(remaining)
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self.state.UpdateStateObject(sender)
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self.state.UpdateStateObject(receiver)
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return nil
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}
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func (self *StateTransition) transferValue(sender, receiver *StateObject) error {
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if sender.Amount.Cmp(self.tx.Value) < 0 {
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return fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.tx.Value, sender.Amount)
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}
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if self.tx.Value.Cmp(ethutil.Big0) > 0 {
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// Subtract the amount from the senders account
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sender.SubAmount(self.tx.Value)
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// Add the amount to receivers account which should conclude this transaction
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receiver.AddAmount(self.tx.Value)
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ethutil.Config.Log.Debugf("%x => %x (%v) %x\n", sender.Address()[:4], receiver.Address()[:4], self.tx.Value, self.tx.Hash())
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}
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return nil
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}
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func (self *StateTransition) Eval(script []byte, context *StateObject) (ret []byte, err error) {
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var (
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tx = self.tx
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block = self.block
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initiator = self.Sender()
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state = self.state
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)
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closure := NewClosure(initiator, context, script, state, self.gas, tx.GasPrice)
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vm := NewVm(state, nil, 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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