mirror of https://github.com/poanetwork/quorum.git
199 lines
4.7 KiB
Go
199 lines
4.7 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/core/types"
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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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/*
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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, receiver []byte
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tx *types.Transaction
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gas, gasPrice *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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block *types.Block
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cb, rec, sen *state.StateObject
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}
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func NewStateTransition(coinbase *state.StateObject, tx *types.Transaction, state *state.StateDB, block *types.Block) *StateTransition {
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return &StateTransition{coinbase.Address(), tx.Recipient, tx, new(big.Int), new(big.Int).Set(tx.GasPrice), tx.Value, tx.Data, state, block, coinbase, nil, nil}
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}
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func (self *StateTransition) Coinbase() *state.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.GetOrNewStateObject(self.coinbase)
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return self.cb
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}
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func (self *StateTransition) Sender() *state.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.GetOrNewStateObject(self.tx.Sender())
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return self.sen
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}
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func (self *StateTransition) Receiver() *state.StateObject {
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if self.tx != nil && 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.GetOrNewStateObject(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.Balance().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(), sender.Balance())
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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.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) RefundGas() {
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coinbase, sender := self.Coinbase(), self.Sender()
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coinbase.RefundGas(self.gas, self.tx.GasPrice)
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// Return remaining gas
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remaining := new(big.Int).Mul(self.gas, self.tx.GasPrice)
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sender.AddAmount(remaining)
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}
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func (self *StateTransition) preCheck() (err error) {
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var (
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tx = self.tx
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sender = self.Sender()
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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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// 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() (err error) {
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statelogger.Debugf("(~) %x\n", self.tx.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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tx = self.tx
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sender = self.Sender()
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receiver *state.StateObject
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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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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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var ret []byte
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vmenv := NewEnv(self.state, self.tx, self.block)
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var ref vm.ClosureRef
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if tx.CreatesContract() {
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self.rec = MakeContract(tx, self.state)
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ret, err, ref = vmenv.Create(sender, receiver.Address(), self.tx.Data, self.gas, self.gasPrice, self.value)
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ref.SetCode(ret)
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} else {
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ret, err = vmenv.Call(self.Sender(), self.Receiver().Address(), self.tx.Data, self.gas, self.gasPrice, self.value)
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}
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if err != nil {
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statelogger.Debugln(err)
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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(tx *types.Transaction, state *state.StateDB) *state.StateObject {
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addr := tx.CreationAddress(state)
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contract := state.GetOrNewStateObject(addr)
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contract.InitCode = tx.Data
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return contract
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}
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