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551 lines
17 KiB
551 lines
17 KiB
// 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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"bytes"
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"errors"
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"math"
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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/rlp"
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"github.com/harmony-one/harmony/core/types"
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"github.com/harmony-one/harmony/core/vm"
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"github.com/harmony-one/harmony/internal/params"
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"github.com/harmony-one/harmony/internal/utils"
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staking "github.com/harmony-one/harmony/staking/types"
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)
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var (
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errInvalidSigner = errors.New("invalid signer for staking transaction")
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errInsufficientBalanceForGas = errors.New("insufficient balance to pay for gas")
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errInsufficientBalanceForStake = errors.New("insufficient balance to stake")
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errValidatorExist = errors.New("staking validator already exists")
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errValidatorNotExist = errors.New("staking validator does not exist")
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errNoDelegationToUndelegate = errors.New("no delegation to undelegate")
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errCommissionRateChangeTooFast = errors.New("commission rate can not be changed more than MaxChangeRate within the same epoch")
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errCommissionRateChangeTooHigh = errors.New("commission rate can not be higher than MaxCommissionRate")
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errNoRewardsToCollect = errors.New("no rewards to collect")
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)
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/*
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StateTransition is the State Transitioning Model which is described as follows:
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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 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 uint64
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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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bc ChainContext
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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() uint64
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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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Type() types.TransactionType
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BlockNum() *big.Int
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}
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// IntrinsicGas computes the 'intrinsic gas' for a message with the given data.
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func IntrinsicGas(data []byte, contractCreation, homestead bool) (uint64, error) {
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// Set the starting gas for the raw transaction
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var gas uint64
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if contractCreation && homestead {
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gas = params.TxGasContractCreation
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} else {
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gas = params.TxGas
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}
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// Bump the required gas by the amount of transactional data
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if len(data) > 0 {
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// Zero and non-zero bytes are priced differently
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var nz uint64
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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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// Make sure we don't exceed uint64 for all data combinations
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if (math.MaxUint64-gas)/params.TxDataNonZeroGas < nz {
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return 0, vm.ErrOutOfGas
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}
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gas += nz * params.TxDataNonZeroGas
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z := uint64(len(data)) - nz
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if (math.MaxUint64-gas)/params.TxDataZeroGas < z {
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return 0, vm.ErrOutOfGas
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}
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gas += z * params.TxDataZeroGas
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}
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return gas, nil
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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, bc ChainContext) *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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value: msg.Value(),
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data: msg.Data(),
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state: evm.StateDB,
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bc: bc,
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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, uint64, bool, error) {
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return NewStateTransition(evm, msg, gp, nil).TransitionDb()
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}
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// ApplyStakingMessage computes the new state for staking message
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func ApplyStakingMessage(evm *vm.EVM, msg Message, gp *GasPool, bc ChainContext) (uint64, error) {
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return NewStateTransition(evm, msg, gp, bc).StakingTransitionDb()
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}
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// to returns the recipient of the message.
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func (st *StateTransition) to() common.Address {
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if st.msg == nil || st.msg.To() == nil /* contract creation */ {
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return common.Address{}
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}
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return *st.msg.To()
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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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mgval := new(big.Int).Mul(new(big.Int).SetUint64(st.msg.Gas()), st.gasPrice)
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if st.state.GetBalance(st.msg.From()).Cmp(mgval) < 0 {
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return errInsufficientBalanceForGas
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}
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if err := st.gp.SubGas(st.msg.Gas()); err != nil {
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return err
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}
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st.gas += st.msg.Gas()
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st.initialGas = st.msg.Gas()
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st.state.SubBalance(st.msg.From(), mgval)
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return nil
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}
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func (st *StateTransition) preCheck() error {
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// Make sure this transaction's nonce is correct.
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if st.msg.CheckNonce() {
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nonce := st.state.GetNonce(st.msg.From())
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if nonce < st.msg.Nonce() {
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return ErrNonceTooHigh
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} else if nonce > st.msg.Nonce() {
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return ErrNonceTooLow
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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
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// returning the result including the used gas. It returns an error if failed.
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// An error indicates a consensus issue.
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func (st *StateTransition) TransitionDb() (ret []byte, usedGas uint64, failed bool, 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 := vm.AccountRef(msg.From())
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homestead := st.evm.ChainConfig().IsS3(st.evm.EpochNumber) // s3 includes homestead
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contractCreation := msg.To() == nil
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// Pay intrinsic gas
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gas, err := IntrinsicGas(st.data, contractCreation, homestead)
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if err != nil {
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return nil, 0, false, err
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}
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if err = st.useGas(gas); err != nil {
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return nil, 0, false, 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(msg.From(), st.state.GetNonce(sender.Address())+1)
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ret, st.gas, vmerr = evm.Call(sender, st.to(), st.data, st.gas, st.value)
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}
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if vmerr != nil {
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utils.Logger().Debug().Err(vmerr).Msg("VM returned with error")
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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, 0, false, vmerr
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}
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}
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st.refundGas()
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// TODO: need to move the gas fee to the general block rewards
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st.state.AddBalance(st.evm.Coinbase, new(big.Int).Mul(new(big.Int).SetUint64(st.gasUsed()), st.gasPrice))
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return ret, st.gasUsed(), vmerr != nil, err
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}
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func (st *StateTransition) refundGas() {
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// Apply refund counter, capped to half of the used gas.
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refund := st.gasUsed() / 2
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if refund > st.state.GetRefund() {
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refund = st.state.GetRefund()
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}
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st.gas += refund
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// Return ETH for remaining gas, exchanged at the original rate.
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remaining := new(big.Int).Mul(new(big.Int).SetUint64(st.gas), st.gasPrice)
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st.state.AddBalance(st.msg.From(), remaining)
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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(st.gas)
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}
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// gasUsed returns the amount of gas used up by the state transition.
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func (st *StateTransition) gasUsed() uint64 {
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return st.initialGas - st.gas
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}
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// StakingTransitionDb will transition the state by applying the staking message and
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// returning the result including the used gas. It returns an error if failed.
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// It is used for staking transaction only
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func (st *StateTransition) StakingTransitionDb() (usedGas uint64, err error) {
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if err = st.preCheck(); err != nil {
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return 0, err
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}
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msg := st.msg
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sender := vm.AccountRef(msg.From())
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homestead := st.evm.ChainConfig().IsS3(st.evm.EpochNumber) // s3 includes homestead
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// Pay intrinsic gas
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// TODO: propose staking-specific formula for staking transaction
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gas, err := IntrinsicGas(st.data, false, homestead)
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// TODO Remove this logging
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utils.Logger().Info().Uint64("Using", gas).Msg("Gas cost of staking transaction being processed")
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if err != nil {
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return 0, err
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}
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if err = st.useGas(gas); err != nil {
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return 0, err
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}
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// Increment the nonce for the next transaction
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st.state.SetNonce(msg.From(), st.state.GetNonce(sender.Address())+1)
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switch msg.Type() {
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case types.StakeNewVal:
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stkMsg := &staking.CreateValidator{}
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if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
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return 0, err
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}
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if msg.From() != stkMsg.ValidatorAddress {
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return 0, errInvalidSigner
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}
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err = st.applyCreateValidatorTx(stkMsg, msg.BlockNum())
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case types.StakeEditVal:
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stkMsg := &staking.EditValidator{}
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if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
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return 0, err
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}
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if msg.From() != stkMsg.ValidatorAddress {
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return 0, errInvalidSigner
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}
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err = st.applyEditValidatorTx(stkMsg, msg.BlockNum())
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case types.Delegate:
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stkMsg := &staking.Delegate{}
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if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
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return 0, err
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}
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if msg.From() != stkMsg.DelegatorAddress {
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return 0, errInvalidSigner
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}
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err = st.applyDelegateTx(stkMsg)
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case types.Undelegate:
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stkMsg := &staking.Undelegate{}
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if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
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return 0, err
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}
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if msg.From() != stkMsg.DelegatorAddress {
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return 0, errInvalidSigner
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}
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err = st.applyUndelegateTx(stkMsg)
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case types.CollectRewards:
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stkMsg := &staking.CollectRewards{}
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if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
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return 0, err
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}
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if msg.From() != stkMsg.DelegatorAddress {
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return 0, errInvalidSigner
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}
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err = st.applyCollectRewards(stkMsg)
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default:
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return 0, staking.ErrInvalidStakingKind
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}
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st.refundGas()
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return st.gasUsed(), err
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}
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func (st *StateTransition) applyCreateValidatorTx(createValidator *staking.CreateValidator, blockNum *big.Int) error {
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if st.state.IsValidator(createValidator.ValidatorAddress) {
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return errValidatorExist
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}
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v, err := staking.CreateValidatorFromNewMsg(createValidator, blockNum)
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if err != nil {
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return err
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}
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delegations := []staking.Delegation{}
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delegations = append(delegations, staking.NewDelegation(v.Address, createValidator.Amount))
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wrapper := staking.ValidatorWrapper{*v, delegations}
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if err := st.state.UpdateStakingInfo(v.Address, &wrapper); err != nil {
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return err
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}
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st.state.SetValidatorFlag(v.Address)
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return nil
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}
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func (st *StateTransition) applyEditValidatorTx(editValidator *staking.EditValidator, blockNum *big.Int) error {
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if !st.state.IsValidator(editValidator.ValidatorAddress) {
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return errValidatorNotExist
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}
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wrapper := st.state.GetStakingInfo(editValidator.ValidatorAddress)
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if wrapper == nil {
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return errValidatorNotExist
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}
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if err := staking.UpdateValidatorFromEditMsg(&wrapper.Validator, editValidator); err != nil {
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return err
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}
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newRate := wrapper.Validator.Rate
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// TODO: make sure we are reading from the correct snapshot
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snapshotValidator, err := st.bc.ReadValidatorSnapshot(wrapper.Address)
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if err != nil {
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return err
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}
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rateAtBeginningOfEpoch := snapshotValidator.Rate
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if rateAtBeginningOfEpoch.IsNil() || (!newRate.IsNil() && !rateAtBeginningOfEpoch.Equal(newRate)) {
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wrapper.Validator.UpdateHeight = blockNum
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}
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if newRate.Sub(rateAtBeginningOfEpoch).Abs().GT(wrapper.Validator.MaxChangeRate) {
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return errCommissionRateChangeTooFast
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}
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if newRate.GT(wrapper.Validator.MaxRate) {
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return errCommissionRateChangeTooHigh
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}
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if err := st.state.UpdateStakingInfo(editValidator.ValidatorAddress, wrapper); 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 (st *StateTransition) applyDelegateTx(delegate *staking.Delegate) error {
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if !st.state.IsValidator(delegate.ValidatorAddress) {
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return errValidatorNotExist
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}
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wrapper := st.state.GetStakingInfo(delegate.ValidatorAddress)
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if wrapper == nil {
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return errValidatorNotExist
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}
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stateDB := st.state
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delegatorExist := false
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for i := range wrapper.Delegations {
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delegation := &wrapper.Delegations[i]
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if bytes.Equal(delegation.DelegatorAddress.Bytes(), delegate.DelegatorAddress.Bytes()) {
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delegatorExist = true
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totalInUndelegation := delegation.TotalInUndelegation()
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// If the sum of normal balance and the total amount of tokens in undelegation is greater than the amount to delegate
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if big.NewInt(0).Add(totalInUndelegation, stateDB.GetBalance(delegate.DelegatorAddress)).Cmp(delegate.Amount) >= 0 {
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// Firstly use the tokens in undelegation to delegate (redelegate)
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undelegateAmount := big.NewInt(0).Set(delegate.Amount)
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// Use the latest undelegated token first as it has the longest remaining locking time.
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i := len(delegation.Undelegations) - 1
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for ; i >= 0; i-- {
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if delegation.Undelegations[i].Amount.Cmp(undelegateAmount) <= 0 {
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undelegateAmount.Sub(undelegateAmount, delegation.Undelegations[i].Amount)
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} else {
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delegation.Undelegations[i].Amount.Sub(delegation.Undelegations[i].Amount, undelegateAmount)
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break
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}
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}
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delegation.Undelegations = delegation.Undelegations[:i+1]
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delegation.Amount.Add(delegation.Amount, delegate.Amount)
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err := stateDB.UpdateStakingInfo(wrapper.Validator.Address, wrapper)
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// Secondly, if all locked token are used, try use the balance.
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if err == nil && undelegateAmount.Cmp(big.NewInt(0)) > 0 {
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stateDB.SubBalance(delegate.DelegatorAddress, delegate.Amount)
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}
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return err
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}
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return errInsufficientBalanceForStake
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}
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}
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if !delegatorExist {
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if CanTransfer(stateDB, delegate.DelegatorAddress, delegate.Amount) {
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newDelegator := staking.NewDelegation(delegate.DelegatorAddress, delegate.Amount)
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wrapper.Delegations = append(wrapper.Delegations, newDelegator)
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if err := stateDB.UpdateStakingInfo(wrapper.Validator.Address, wrapper); err == nil {
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stateDB.SubBalance(delegate.DelegatorAddress, delegate.Amount)
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} else {
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return err
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}
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}
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}
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return nil
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}
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func (st *StateTransition) applyUndelegateTx(undelegate *staking.Undelegate) error {
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if !st.state.IsValidator(undelegate.ValidatorAddress) {
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return errValidatorNotExist
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}
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wrapper := st.state.GetStakingInfo(undelegate.ValidatorAddress)
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if wrapper == nil {
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return errValidatorNotExist
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}
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stateDB := st.state
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delegatorExist := false
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for i := range wrapper.Delegations {
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delegation := &wrapper.Delegations[i]
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if bytes.Equal(delegation.DelegatorAddress.Bytes(), undelegate.DelegatorAddress.Bytes()) {
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delegatorExist = true
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|
|
err := delegation.Undelegate(st.evm.EpochNumber, undelegate.Amount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
err = stateDB.UpdateStakingInfo(wrapper.Validator.Address, wrapper)
|
|
return err
|
|
}
|
|
}
|
|
if !delegatorExist {
|
|
return errNoDelegationToUndelegate
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (st *StateTransition) applyCollectRewards(collectRewards *staking.CollectRewards) error {
|
|
if st.bc == nil {
|
|
return errors.New("[CollectRewards] No chain context provided")
|
|
}
|
|
chainContext := st.bc
|
|
delegations, err := chainContext.ReadDelegationsByDelegator(collectRewards.DelegatorAddress)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
totalRewards := big.NewInt(0)
|
|
for i := range delegations {
|
|
wrapper := st.state.GetStakingInfo(delegations[i].ValidatorAddress)
|
|
if wrapper == nil {
|
|
return errValidatorNotExist
|
|
}
|
|
|
|
if uint64(len(wrapper.Delegations)) > delegations[i].Index {
|
|
delegation := &wrapper.Delegations[delegations[i].Index]
|
|
if delegation.Reward.Cmp(big.NewInt(0)) > 0 {
|
|
totalRewards.Add(totalRewards, delegation.Reward)
|
|
}
|
|
|
|
delegation.Reward.SetUint64(0)
|
|
}
|
|
|
|
err = st.state.UpdateStakingInfo(wrapper.Validator.Address, wrapper)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if totalRewards.Int64() == 0 {
|
|
return errNoRewardsToCollect
|
|
}
|
|
st.state.AddBalance(collectRewards.DelegatorAddress, totalRewards)
|
|
return nil
|
|
}
|
|
|