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405 lines
13 KiB
405 lines
13 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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"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/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/utils"
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"github.com/harmony-one/harmony/numeric"
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"github.com/harmony-one/harmony/shard"
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stakingTypes "github.com/harmony-one/harmony/staking/types"
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"github.com/pkg/errors"
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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("change on commission rate can not be more than max change rate within the same epoch")
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errCommissionRateChangeTooHigh = errors.New("commission rate can not be higher than maximum commission rate")
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errCommissionRateChangeTooLow = errors.New("commission rate can not be lower than min rate of 5%")
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errNoRewardsToCollect = errors.New("no rewards to collect")
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errNegativeAmount = errors.New("amount can not be negative")
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errDupIdentity = errors.New("validator identity exists")
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errDupBlsKey = errors.New("BLS key exists")
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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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// ExecutionResult is the return value from a transaction committed to the DB
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type ExecutionResult struct {
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ReturnData []byte
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UsedGas uint64
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VMErr error
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}
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// Unwrap returns the internal evm error which allows us for further
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// analysis outside.
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func (result *ExecutionResult) Unwrap() error {
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return result.VMErr
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}
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// Failed returns the indicator whether the execution is successful or not
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func (result *ExecutionResult) Failed() bool { return result.VMErr != nil }
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// Return is a helper function to help caller distinguish between revert reason
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// and function return. Return returns the data after execution if no error occurs.
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func (result *ExecutionResult) Return() []byte {
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if result.VMErr != nil {
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return nil
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}
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return common.CopyBytes(result.ReturnData)
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}
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// Revert returns the concrete revert reason if the execution is aborted by `REVERT`
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// opcode. Note the reason can be nil if no data supplied with revert opcode.
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func (result *ExecutionResult) Revert() []byte {
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if result.VMErr != vm.ErrExecutionReverted {
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return nil
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}
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return common.CopyBytes(result.ReturnData)
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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) (ExecutionResult, 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 have := st.state.GetBalance(st.msg.From()); have.Cmp(mgval) < 0 {
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return errors.Wrapf(
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errInsufficientBalanceForGas,
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"had: %s but need: %s", have.String(), mgval.String(),
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)
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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() (ExecutionResult, error) {
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if err := st.preCheck(); err != nil {
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return ExecutionResult{}, 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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istanbul := st.evm.ChainConfig().IsIstanbul(st.evm.EpochNumber)
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contractCreation := msg.To() == nil
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// Pay intrinsic gas
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gas, err := vm.IntrinsicGas(st.data, contractCreation, homestead, istanbul, false)
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if err != nil {
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return ExecutionResult{}, err
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}
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if err = st.useGas(gas); err != nil {
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return ExecutionResult{}, fmt.Errorf("%w: have %d, want %d", ErrIntrinsicGas, st.gas, gas)
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}
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evm := st.evm
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var ret []byte
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// All VM errors are valid except for insufficient balance, therefore returned separately
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var vmErr error
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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 ExecutionResult{}, vmErr
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}
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}
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st.refundGas()
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st.collectGas()
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return ExecutionResult{
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ReturnData: ret,
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UsedGas: st.gasUsed(),
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VMErr: vmErr,
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}, 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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func (st *StateTransition) collectGas() {
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if config := st.evm.ChainConfig(); !config.IsStaking(st.evm.EpochNumber) {
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// Before staking epoch, add the fees to the block producer
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txFee := new(big.Int).Mul(
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new(big.Int).SetUint64(st.gasUsed()),
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st.gasPrice,
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)
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st.state.AddBalance(st.evm.Coinbase, txFee)
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} else if feeCollectors := shard.Schedule.InstanceForEpoch(
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st.evm.EpochNumber,
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).FeeCollectors(); len(feeCollectors) > 0 {
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// The caller must ensure that the feeCollectors are accurately set
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// at the appropriate epochs
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txFee := numeric.NewDecFromBigInt(
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new(big.Int).Mul(
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new(big.Int).SetUint64(st.gasUsed()),
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st.gasPrice,
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),
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)
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for address, percent := range feeCollectors {
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collectedFee := percent.Mul(txFee)
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st.state.AddBalance(address, collectedFee.TruncateInt())
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}
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}
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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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istanbul := st.evm.ChainConfig().IsIstanbul(st.evm.EpochNumber)
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// Pay intrinsic gas
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gas, err := vm.IntrinsicGas(st.data, false, homestead, istanbul, msg.Type() == types.StakeCreateVal)
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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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// from worker.go, we get here with shardID == BeaconChainShardID
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// from node_handler.go, via blockchain.go => it is checked that block shard == node shard
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// same via consensus
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// so only possible to reach here if shardID == BeaconChainShardID (no need to check further)
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switch msg.Type() {
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case types.StakeCreateVal:
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stkMsg := &stakingTypes.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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utils.Logger().Info().
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Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
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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.evm.CreateValidator(st.evm.StateDB, nil, stkMsg)
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case types.StakeEditVal:
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stkMsg := &stakingTypes.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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utils.Logger().Info().
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Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
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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.evm.EditValidator(st.evm.StateDB, nil, stkMsg)
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case types.Delegate:
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stkMsg := &stakingTypes.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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utils.Logger().Info().Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
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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.evm.Delegate(st.evm.StateDB, nil, stkMsg)
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case types.Undelegate:
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stkMsg := &stakingTypes.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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utils.Logger().Info().Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
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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.evm.Undelegate(st.evm.StateDB, nil, stkMsg)
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case types.CollectRewards:
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stkMsg := &stakingTypes.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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utils.Logger().Info().Msgf("[DEBUG STAKING] staking type: %s, gas: %d, txn: %+v", msg.Type(), gas, stkMsg)
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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.evm.CollectRewards(st.evm.StateDB, nil, stkMsg)
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default:
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return 0, stakingTypes.ErrInvalidStakingKind
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}
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st.refundGas()
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st.collectGas()
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return st.gasUsed(), err
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}
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