f0cbebb19f
Added chain configuration options and write out during genesis database insertion. If no "config" was found, nothing is written to the database. Configurations are written on a per genesis base. This means that any chain (which is identified by it's genesis hash) can have their own chain settings.
283 lines
7.1 KiB
Go
283 lines
7.1 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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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/common"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/params"
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)
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var (
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Big0 = big.NewInt(0)
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)
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/*
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The State Transitioning Model
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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 gas
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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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gp *GasPool
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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 vm.Database
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env vm.Environment
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}
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// Message represents a message sent to a contract.
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type Message interface {
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From() (common.Address, error)
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FromFrontier() (common.Address, error)
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To() *common.Address
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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 MessageCreatesContract(msg Message) bool {
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return msg.To() == nil
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}
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// IntrinsicGas computes the 'intrinsic gas' for a message
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// with the given data.
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func IntrinsicGas(data []byte, contractCreation, homestead bool) *big.Int {
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igas := new(big.Int)
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if contractCreation && homestead {
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igas.Set(params.TxGasContractCreation)
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} else {
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igas.Set(params.TxGas)
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}
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if len(data) > 0 {
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var nz int64
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for _, byt := range data {
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if byt != 0 {
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nz++
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}
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}
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m := big.NewInt(nz)
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m.Mul(m, params.TxDataNonZeroGas)
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igas.Add(igas, m)
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m.SetInt64(int64(len(data)) - nz)
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m.Mul(m, params.TxDataZeroGas)
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igas.Add(igas, m)
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}
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return igas
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}
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func ApplyMessage(env vm.Environment, msg Message, gp *GasPool) ([]byte, *big.Int, error) {
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var st = StateTransition{
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gp: gp,
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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: 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.Db(),
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}
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return st.transitionDb()
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}
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func (self *StateTransition) from() (vm.Account, error) {
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var (
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f common.Address
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err error
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)
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if self.env.RuleSet().IsHomestead(self.env.BlockNumber()) {
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f, err = self.msg.From()
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} else {
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f, err = self.msg.FromFrontier()
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}
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if err != nil {
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return nil, err
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}
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if !self.state.Exist(f) {
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return self.state.CreateAccount(f), nil
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}
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return self.state.GetAccount(f), nil
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}
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func (self *StateTransition) to() vm.Account {
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if self.msg == nil {
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return nil
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}
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to := self.msg.To()
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if to == nil {
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return nil // contract creation
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}
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if !self.state.Exist(*to) {
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return self.state.CreateAccount(*to)
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}
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return self.state.GetAccount(*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 vm.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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mgas := self.msg.Gas()
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mgval := new(big.Int).Mul(mgas, self.gasPrice)
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sender, err := self.from()
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if err != nil {
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return err
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}
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if sender.Balance().Cmp(mgval) < 0 {
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return fmt.Errorf("insufficient ETH for gas (%x). Req %v, has %v", sender.Address().Bytes()[:4], mgval, sender.Balance())
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}
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if err = self.gp.SubGas(mgas); err != nil {
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return err
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}
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self.addGas(mgas)
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self.initialGas.Set(mgas)
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sender.SubBalance(mgval)
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return nil
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}
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func (self *StateTransition) preCheck() (err error) {
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msg := self.msg
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sender, err := self.from()
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if err != nil {
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return err
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}
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// Make sure this transaction's nonce is correct
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if n := self.state.GetNonce(sender.Address()); n != msg.Nonce() {
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return NonceError(msg.Nonce(), n)
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}
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// Pre-pay gas
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if err = self.buyGas(); err != nil {
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if IsGasLimitErr(err) {
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return err
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}
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return InvalidTxError(err)
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}
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return nil
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}
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func (self *StateTransition) transitionDb() (ret []byte, usedGas *big.Int, err error) {
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if err = self.preCheck(); err != nil {
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return
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}
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msg := self.msg
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sender, _ := self.from() // err checked in preCheck
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homestead := self.env.RuleSet().IsHomestead(self.env.BlockNumber())
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contractCreation := MessageCreatesContract(msg)
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// Pay intrinsic gas
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if err = self.useGas(IntrinsicGas(self.data, contractCreation, homestead)); err != nil {
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return nil, nil, InvalidTxError(err)
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}
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vmenv := self.env
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//var addr common.Address
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if contractCreation {
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ret, _, err = vmenv.Create(sender, self.data, self.gas, self.gasPrice, self.value)
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if homestead && err == vm.CodeStoreOutOfGasError {
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self.gas = Big0
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}
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if err != nil {
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ret = nil
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glog.V(logger.Core).Infoln("VM create err:", err)
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}
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} else {
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// Increment the nonce for the next transaction
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self.state.SetNonce(sender.Address(), self.state.GetNonce(sender.Address())+1)
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ret, err = vmenv.Call(sender, self.to().Address(), self.data, self.gas, self.gasPrice, self.value)
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if err != nil {
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glog.V(logger.Core).Infoln("VM call err:", err)
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}
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}
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if err != nil && IsValueTransferErr(err) {
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return nil, nil, InvalidTxError(err)
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}
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// We aren't interested in errors here. Errors returned by the VM are non-consensus errors and therefor shouldn't bubble up
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if err != nil {
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err = nil
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}
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self.refundGas()
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self.state.AddBalance(self.env.Coinbase(), new(big.Int).Mul(self.gasUsed(), self.gasPrice))
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return ret, self.gasUsed(), err
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}
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func (self *StateTransition) refundGas() {
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// Return eth for remaining gas to the sender account,
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// exchanged at the original rate.
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sender, _ := self.from() // err already checked
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remaining := new(big.Int).Mul(self.gas, self.gasPrice)
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sender.AddBalance(remaining)
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// Apply refund counter, capped to half of the used gas.
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uhalf := remaining.Div(self.gasUsed(), common.Big2)
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refund := common.BigMin(uhalf, self.state.GetRefund())
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self.gas.Add(self.gas, refund)
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self.state.AddBalance(sender.Address(), refund.Mul(refund, self.gasPrice))
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// Also return remaining gas to the block gas counter so it is
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// available for the next transaction.
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self.gp.AddGas(self.gas)
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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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