mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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284 lines
7.8 KiB
Go
284 lines
7.8 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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"errors"
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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/common/math"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/log"
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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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errInsufficientBalanceForGas = errors.New("insufficient balance to pay for gas")
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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 uint64
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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.StateDB
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evm *vm.EVM
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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
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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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CheckNonce() bool
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Data() []byte
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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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//
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// TODO convert to uint64
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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.SetUint64(params.TxGasContractCreation)
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} else {
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igas.SetUint64(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, new(big.Int).SetUint64(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, new(big.Int).SetUint64(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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// NewStateTransition initialises and returns a new state transition object.
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func NewStateTransition(evm *vm.EVM, msg Message, gp *GasPool) *StateTransition {
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return &StateTransition{
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gp: gp,
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evm: evm,
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msg: msg,
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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: evm.StateDB,
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}
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}
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// ApplyMessage computes the new state by applying the given message
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// against the old state within the environment.
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//
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// ApplyMessage returns the bytes returned by any EVM execution (if it took place),
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// the gas used (which includes gas refunds) and an error if it failed. An error always
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// indicates a core error meaning that the message would always fail for that particular
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// state and would never be accepted within a block.
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func ApplyMessage(evm *vm.EVM, msg Message, gp *GasPool) ([]byte, *big.Int, error) {
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st := NewStateTransition(evm, msg, gp)
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ret, _, gasUsed, err := st.TransitionDb()
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return ret, gasUsed, err
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}
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func (st *StateTransition) from() vm.AccountRef {
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f := st.msg.From()
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if !st.state.Exist(f) {
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st.state.CreateAccount(f)
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}
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return vm.AccountRef(f)
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}
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func (st *StateTransition) to() vm.AccountRef {
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if st.msg == nil {
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return vm.AccountRef{}
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}
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to := st.msg.To()
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if to == nil {
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return vm.AccountRef{} // contract creation
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}
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reference := vm.AccountRef(*to)
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if !st.state.Exist(*to) {
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st.state.CreateAccount(*to)
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}
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return reference
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}
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func (st *StateTransition) useGas(amount uint64) error {
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if st.gas < amount {
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return vm.ErrOutOfGas
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}
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st.gas -= amount
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return nil
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}
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func (st *StateTransition) buyGas() error {
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mgas := st.msg.Gas()
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if mgas.BitLen() > 64 {
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return vm.ErrOutOfGas
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}
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mgval := new(big.Int).Mul(mgas, st.gasPrice)
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var (
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state = st.state
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sender = st.from()
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)
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if state.GetBalance(sender.Address()).Cmp(mgval) < 0 {
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return errInsufficientBalanceForGas
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}
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if err := st.gp.SubGas(mgas); err != nil {
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return err
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}
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st.gas += mgas.Uint64()
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st.initialGas.Set(mgas)
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state.SubBalance(sender.Address(), mgval)
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return nil
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}
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func (st *StateTransition) preCheck() error {
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msg := st.msg
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sender := st.from()
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// Make sure this transaction's nonce is correct
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if msg.CheckNonce() {
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if n := st.state.GetNonce(sender.Address()); n != msg.Nonce() {
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return fmt.Errorf("invalid nonce: have %d, expected %d", msg.Nonce(), n)
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}
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}
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return st.buyGas()
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}
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// TransitionDb will transition the state by applying the current message and returning the result
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// including the required gas for the operation as well as the used gas. It returns an error if it
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// failed. An error indicates a consensus issue.
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func (st *StateTransition) TransitionDb() (ret []byte, requiredGas, usedGas *big.Int, err error) {
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if err = st.preCheck(); err != nil {
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return
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}
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msg := st.msg
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sender := st.from() // err checked in preCheck
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homestead := st.evm.ChainConfig().IsHomestead(st.evm.BlockNumber)
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contractCreation := msg.To() == nil
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// Pay intrinsic gas
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// TODO convert to uint64
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intrinsicGas := IntrinsicGas(st.data, contractCreation, homestead)
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if intrinsicGas.BitLen() > 64 {
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return nil, nil, nil, vm.ErrOutOfGas
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}
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if err = st.useGas(intrinsicGas.Uint64()); err != nil {
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return nil, nil, nil, err
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}
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var (
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evm = st.evm
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// vm errors do not effect consensus and are therefor
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// not assigned to err, except for insufficient balance
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// error.
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vmerr error
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)
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if contractCreation {
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ret, _, st.gas, vmerr = evm.Create(sender, st.data, st.gas, st.value)
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} else {
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// Increment the nonce for the next transaction
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st.state.SetNonce(sender.Address(), st.state.GetNonce(sender.Address())+1)
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ret, st.gas, vmerr = evm.Call(sender, st.to().Address(), st.data, st.gas, st.value)
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}
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if vmerr != nil {
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log.Debug("VM returned with error", "err", vmerr)
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// The only possible consensus-error would be if there wasn't
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// sufficient balance to make the transfer happen. The first
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// balance transfer may never fail.
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if vmerr == vm.ErrInsufficientBalance {
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return nil, nil, nil, vmerr
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}
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}
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requiredGas = new(big.Int).Set(st.gasUsed())
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st.refundGas()
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st.state.AddBalance(st.evm.Coinbase, new(big.Int).Mul(st.gasUsed(), st.gasPrice))
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return ret, requiredGas, st.gasUsed(), err
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}
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func (st *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 := st.from() // err already checked
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remaining := new(big.Int).Mul(new(big.Int).SetUint64(st.gas), st.gasPrice)
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st.state.AddBalance(sender.Address(), remaining)
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// Apply refund counter, capped to half of the used gas.
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uhalf := remaining.Div(st.gasUsed(), common.Big2)
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refund := math.BigMin(uhalf, st.state.GetRefund())
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st.gas += refund.Uint64()
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st.state.AddBalance(sender.Address(), refund.Mul(refund, st.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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st.gp.AddGas(new(big.Int).SetUint64(st.gas))
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}
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func (st *StateTransition) gasUsed() *big.Int {
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return new(big.Int).Sub(st.initialGas, new(big.Int).SetUint64(st.gas))
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}
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