You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
405 lines
13 KiB
405 lines
13 KiB
// Copyright 2014 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package core
|
|
|
|
import (
|
|
"fmt"
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/rlp"
|
|
"github.com/harmony-one/harmony/core/types"
|
|
"github.com/harmony-one/harmony/core/vm"
|
|
"github.com/harmony-one/harmony/internal/utils"
|
|
"github.com/harmony-one/harmony/numeric"
|
|
"github.com/harmony-one/harmony/shard"
|
|
stakingTypes "github.com/harmony-one/harmony/staking/types"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
var (
|
|
errInvalidSigner = errors.New("invalid signer for staking transaction")
|
|
errInsufficientBalanceForGas = errors.New("insufficient balance to pay for gas")
|
|
errInsufficientBalanceForStake = errors.New("insufficient balance to stake")
|
|
errValidatorExist = errors.New("staking validator already exists")
|
|
errValidatorNotExist = errors.New("staking validator does not exist")
|
|
errNoDelegationToUndelegate = errors.New("no delegation to undelegate")
|
|
errCommissionRateChangeTooFast = errors.New("change on commission rate can not be more than max change rate within the same epoch")
|
|
errCommissionRateChangeTooHigh = errors.New("commission rate can not be higher than maximum commission rate")
|
|
errCommissionRateChangeTooLowT = errors.New("commission rate can not be lower than min rate of ")
|
|
errNoRewardsToCollect = errors.New("no rewards to collect")
|
|
errNegativeAmount = errors.New("amount can not be negative")
|
|
errDupIdentity = errors.New("validator identity exists")
|
|
errDupBlsKey = errors.New("BLS key exists")
|
|
)
|
|
|
|
/*
|
|
StateTransition is the State Transitioning Model which is described as follows:
|
|
|
|
A state transition is a change made when a transaction is applied to the current world state
|
|
The state transitioning model does all the necessary work to work out a valid new state root.
|
|
|
|
1) Nonce handling
|
|
2) Pre pay gas
|
|
3) Create a new state object if the recipient is \0*32
|
|
4) Value transfer
|
|
== If contract creation ==
|
|
|
|
4a) Attempt to run transaction data
|
|
4b) If valid, use result as code for the new state object
|
|
|
|
== end ==
|
|
5) Run Script section
|
|
6) Derive new state root
|
|
*/
|
|
type StateTransition struct {
|
|
gp *GasPool
|
|
msg Message
|
|
gas uint64
|
|
gasPrice *big.Int
|
|
initialGas uint64
|
|
value *big.Int
|
|
data []byte
|
|
state vm.StateDB
|
|
evm *vm.EVM
|
|
bc ChainContext
|
|
}
|
|
|
|
// Message represents a message sent to a contract.
|
|
type Message interface {
|
|
From() common.Address
|
|
//FromFrontier() (common.Address, error)
|
|
To() *common.Address
|
|
|
|
GasPrice() *big.Int
|
|
Gas() uint64
|
|
Value() *big.Int
|
|
|
|
Nonce() uint64
|
|
CheckNonce() bool
|
|
Data() []byte
|
|
Type() types.TransactionType
|
|
BlockNum() *big.Int
|
|
}
|
|
|
|
// ExecutionResult is the return value from a transaction committed to the DB
|
|
type ExecutionResult struct {
|
|
ReturnData []byte
|
|
UsedGas uint64
|
|
VMErr error
|
|
}
|
|
|
|
// Unwrap returns the internal evm error which allows us for further
|
|
// analysis outside.
|
|
func (result *ExecutionResult) Unwrap() error {
|
|
return result.VMErr
|
|
}
|
|
|
|
// Failed returns the indicator whether the execution is successful or not
|
|
func (result *ExecutionResult) Failed() bool { return result.VMErr != nil }
|
|
|
|
// Return is a helper function to help caller distinguish between revert reason
|
|
// and function return. Return returns the data after execution if no error occurs.
|
|
func (result *ExecutionResult) Return() []byte {
|
|
if result.VMErr != nil {
|
|
return nil
|
|
}
|
|
return common.CopyBytes(result.ReturnData)
|
|
}
|
|
|
|
// Revert returns the concrete revert reason if the execution is aborted by `REVERT`
|
|
// opcode. Note the reason can be nil if no data supplied with revert opcode.
|
|
func (result *ExecutionResult) Revert() []byte {
|
|
if result.VMErr != vm.ErrExecutionReverted {
|
|
return nil
|
|
}
|
|
return common.CopyBytes(result.ReturnData)
|
|
}
|
|
|
|
// NewStateTransition initialises and returns a new state transition object.
|
|
func NewStateTransition(evm *vm.EVM, msg Message, gp *GasPool, bc ChainContext) *StateTransition {
|
|
return &StateTransition{
|
|
gp: gp,
|
|
evm: evm,
|
|
msg: msg,
|
|
gasPrice: msg.GasPrice(),
|
|
value: msg.Value(),
|
|
data: msg.Data(),
|
|
state: evm.StateDB,
|
|
bc: bc,
|
|
}
|
|
}
|
|
|
|
// ApplyMessage computes the new state by applying the given message
|
|
// against the old state within the environment.
|
|
//
|
|
// ApplyMessage returns the bytes returned by any EVM execution (if it took place),
|
|
// the gas used (which includes gas refunds) and an error if it failed. An error always
|
|
// indicates a core error meaning that the message would always fail for that particular
|
|
// state and would never be accepted within a block.
|
|
func ApplyMessage(evm *vm.EVM, msg Message, gp *GasPool) (ExecutionResult, error) {
|
|
return NewStateTransition(evm, msg, gp, nil).TransitionDb()
|
|
}
|
|
|
|
// ApplyStakingMessage computes the new state for staking message
|
|
func ApplyStakingMessage(evm *vm.EVM, msg Message, gp *GasPool, bc ChainContext) (uint64, error) {
|
|
return NewStateTransition(evm, msg, gp, bc).StakingTransitionDb()
|
|
}
|
|
|
|
// to returns the recipient of the message.
|
|
func (st *StateTransition) to() common.Address {
|
|
if st.msg == nil || st.msg.To() == nil /* contract creation */ {
|
|
return common.Address{}
|
|
}
|
|
return *st.msg.To()
|
|
}
|
|
|
|
func (st *StateTransition) useGas(amount uint64) error {
|
|
if st.gas < amount {
|
|
return vm.ErrOutOfGas
|
|
}
|
|
st.gas -= amount
|
|
|
|
return nil
|
|
}
|
|
|
|
func (st *StateTransition) buyGas() error {
|
|
mgval := new(big.Int).Mul(new(big.Int).SetUint64(st.msg.Gas()), st.gasPrice)
|
|
if have := st.state.GetBalance(st.msg.From()); have.Cmp(mgval) < 0 {
|
|
return errors.Wrapf(
|
|
errInsufficientBalanceForGas,
|
|
"had: %s but need: %s", have.String(), mgval.String(),
|
|
)
|
|
}
|
|
if err := st.gp.SubGas(st.msg.Gas()); err != nil {
|
|
return err
|
|
}
|
|
st.gas += st.msg.Gas()
|
|
|
|
st.initialGas = st.msg.Gas()
|
|
st.state.SubBalance(st.msg.From(), mgval)
|
|
return nil
|
|
}
|
|
|
|
func (st *StateTransition) preCheck() error {
|
|
// Make sure this transaction's nonce is correct.
|
|
if st.msg.CheckNonce() {
|
|
nonce := st.state.GetNonce(st.msg.From())
|
|
|
|
if nonce < st.msg.Nonce() {
|
|
return ErrNonceTooHigh
|
|
} else if nonce > st.msg.Nonce() {
|
|
return ErrNonceTooLow
|
|
}
|
|
}
|
|
return st.buyGas()
|
|
}
|
|
|
|
// TransitionDb will transition the state by applying the current message and
|
|
// returning the result including the used gas. It returns an error if failed.
|
|
// An error indicates a consensus issue.
|
|
func (st *StateTransition) TransitionDb() (ExecutionResult, error) {
|
|
if err := st.preCheck(); err != nil {
|
|
return ExecutionResult{}, err
|
|
}
|
|
msg := st.msg
|
|
sender := vm.AccountRef(msg.From())
|
|
homestead := st.evm.ChainConfig().IsS3(st.evm.EpochNumber) // s3 includes homestead
|
|
istanbul := st.evm.ChainConfig().IsIstanbul(st.evm.EpochNumber)
|
|
contractCreation := msg.To() == nil
|
|
|
|
// Pay intrinsic gas
|
|
gas, err := vm.IntrinsicGas(st.data, contractCreation, homestead, istanbul, false)
|
|
if err != nil {
|
|
return ExecutionResult{}, err
|
|
}
|
|
if err = st.useGas(gas); err != nil {
|
|
return ExecutionResult{}, fmt.Errorf("%w: have %d, want %d", ErrIntrinsicGas, st.gas, gas)
|
|
}
|
|
|
|
evm := st.evm
|
|
|
|
var ret []byte
|
|
// All VM errors are valid except for insufficient balance, therefore returned separately
|
|
var vmErr error
|
|
|
|
if contractCreation {
|
|
ret, _, st.gas, vmErr = evm.Create(sender, st.data, st.gas, st.value)
|
|
} else {
|
|
// Increment the nonce for the next transaction
|
|
st.state.SetNonce(msg.From(), st.state.GetNonce(sender.Address())+1)
|
|
ret, st.gas, vmErr = evm.Call(sender, st.to(), st.data, st.gas, st.value)
|
|
}
|
|
if vmErr != nil {
|
|
utils.Logger().Debug().Err(vmErr).Msg("VM returned with error")
|
|
// The only possible consensus-error would be if there wasn't
|
|
// sufficient balance to make the transfer happen. The first
|
|
// balance transfer may never fail.
|
|
|
|
if vmErr == vm.ErrInsufficientBalance {
|
|
return ExecutionResult{}, vmErr
|
|
}
|
|
}
|
|
st.refundGas()
|
|
st.collectGas()
|
|
|
|
return ExecutionResult{
|
|
ReturnData: ret,
|
|
UsedGas: st.gasUsed(),
|
|
VMErr: vmErr,
|
|
}, err
|
|
}
|
|
|
|
func (st *StateTransition) refundGas() {
|
|
// Apply refund counter, capped to half of the used gas.
|
|
refund := st.gasUsed() / 2
|
|
if refund > st.state.GetRefund() {
|
|
refund = st.state.GetRefund()
|
|
}
|
|
st.gas += refund
|
|
|
|
// Return ETH for remaining gas, exchanged at the original rate.
|
|
remaining := new(big.Int).Mul(new(big.Int).SetUint64(st.gas), st.gasPrice)
|
|
st.state.AddBalance(st.msg.From(), remaining)
|
|
|
|
// Also return remaining gas to the block gas counter so it is
|
|
// available for the next transaction.
|
|
st.gp.AddGas(st.gas)
|
|
}
|
|
|
|
func (st *StateTransition) collectGas() {
|
|
if config := st.evm.ChainConfig(); !config.IsStaking(st.evm.EpochNumber) {
|
|
// Before staking epoch, add the fees to the block producer
|
|
txFee := new(big.Int).Mul(
|
|
new(big.Int).SetUint64(st.gasUsed()),
|
|
st.gasPrice,
|
|
)
|
|
st.state.AddBalance(st.evm.Coinbase, txFee)
|
|
} else if feeCollectors := shard.Schedule.InstanceForEpoch(
|
|
st.evm.EpochNumber,
|
|
).FeeCollectors(); len(feeCollectors) > 0 {
|
|
// The caller must ensure that the feeCollectors are accurately set
|
|
// at the appropriate epochs
|
|
txFee := numeric.NewDecFromBigInt(
|
|
new(big.Int).Mul(
|
|
new(big.Int).SetUint64(st.gasUsed()),
|
|
st.gasPrice,
|
|
),
|
|
)
|
|
for address, percent := range feeCollectors {
|
|
collectedFee := percent.Mul(txFee)
|
|
st.state.AddBalance(address, collectedFee.TruncateInt())
|
|
}
|
|
}
|
|
}
|
|
|
|
// gasUsed returns the amount of gas used up by the state transition.
|
|
func (st *StateTransition) gasUsed() uint64 {
|
|
return st.initialGas - st.gas
|
|
}
|
|
|
|
// StakingTransitionDb will transition the state by applying the staking message and
|
|
// returning the result including the used gas. It returns an error if failed.
|
|
// It is used for staking transaction only
|
|
func (st *StateTransition) StakingTransitionDb() (usedGas uint64, err error) {
|
|
if err = st.preCheck(); err != nil {
|
|
return 0, err
|
|
}
|
|
msg := st.msg
|
|
|
|
sender := vm.AccountRef(msg.From())
|
|
homestead := st.evm.ChainConfig().IsS3(st.evm.EpochNumber) // s3 includes homestead
|
|
istanbul := st.evm.ChainConfig().IsIstanbul(st.evm.EpochNumber)
|
|
|
|
// Pay intrinsic gas
|
|
gas, err := vm.IntrinsicGas(st.data, false, homestead, istanbul, msg.Type() == types.StakeCreateVal)
|
|
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
if err = st.useGas(gas); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
// Increment the nonce for the next transaction
|
|
st.state.SetNonce(msg.From(), st.state.GetNonce(sender.Address())+1)
|
|
|
|
// from worker.go, we get here with shardID == BeaconChainShardID
|
|
// from node_handler.go, via blockchain.go => it is checked that block shard == node shard
|
|
// same via consensus
|
|
// so only possible to reach here if shardID == BeaconChainShardID (no need to check further)
|
|
switch msg.Type() {
|
|
case types.StakeCreateVal:
|
|
stkMsg := &stakingTypes.CreateValidator{}
|
|
if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
|
|
return 0, err
|
|
}
|
|
utils.Logger().Info().
|
|
Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
|
|
if msg.From() != stkMsg.ValidatorAddress {
|
|
return 0, errInvalidSigner
|
|
}
|
|
err = st.evm.CreateValidator(st.evm.StateDB, nil, stkMsg)
|
|
case types.StakeEditVal:
|
|
stkMsg := &stakingTypes.EditValidator{}
|
|
if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
|
|
return 0, err
|
|
}
|
|
utils.Logger().Info().
|
|
Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
|
|
if msg.From() != stkMsg.ValidatorAddress {
|
|
return 0, errInvalidSigner
|
|
}
|
|
err = st.evm.EditValidator(st.evm.StateDB, nil, stkMsg)
|
|
case types.Delegate:
|
|
stkMsg := &stakingTypes.Delegate{}
|
|
if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
|
|
return 0, err
|
|
}
|
|
utils.Logger().Info().Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
|
|
if msg.From() != stkMsg.DelegatorAddress {
|
|
return 0, errInvalidSigner
|
|
}
|
|
err = st.evm.Delegate(st.evm.StateDB, nil, stkMsg)
|
|
case types.Undelegate:
|
|
stkMsg := &stakingTypes.Undelegate{}
|
|
if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
|
|
return 0, err
|
|
}
|
|
utils.Logger().Info().Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
|
|
if msg.From() != stkMsg.DelegatorAddress {
|
|
return 0, errInvalidSigner
|
|
}
|
|
err = st.evm.Undelegate(st.evm.StateDB, nil, stkMsg)
|
|
case types.CollectRewards:
|
|
stkMsg := &stakingTypes.CollectRewards{}
|
|
if err = rlp.DecodeBytes(msg.Data(), stkMsg); err != nil {
|
|
return 0, err
|
|
}
|
|
utils.Logger().Info().Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
|
|
if msg.From() != stkMsg.DelegatorAddress {
|
|
return 0, errInvalidSigner
|
|
}
|
|
err = st.evm.CollectRewards(st.evm.StateDB, nil, stkMsg)
|
|
default:
|
|
return 0, stakingTypes.ErrInvalidStakingKind
|
|
}
|
|
st.refundGas()
|
|
st.collectGas()
|
|
|
|
return st.gasUsed(), err
|
|
}
|
|
|