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evm.go
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evm.go
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// 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 vm
import (
"encoding/binary"
"errors"
"math/big"
"strconv"
"sync/atomic"
"time"
"github.com/DxChainNetwork/godx/common"
"github.com/DxChainNetwork/godx/consensus/dpos"
"github.com/DxChainNetwork/godx/core/types"
"github.com/DxChainNetwork/godx/crypto"
"github.com/DxChainNetwork/godx/log"
"github.com/DxChainNetwork/godx/params"
"github.com/DxChainNetwork/godx/rlp"
"github.com/DxChainNetwork/godx/storage/coinchargemaintenance"
)
// emptyCodeHash is used by create to ensure deployment is disallowed to already
// deployed contract addresses (relevant after the account abstraction).
var (
emptyCodeHash = crypto.Keccak256Hash(nil)
errUnknownStorageContractTx = errors.New("unknown storage contract tx")
errUnknownDposOperationTx = errors.New("unknown dpos operation tx")
)
type (
// CanTransferFunc is the signature of a transfer guard function
CanTransferFunc func(StateDB, common.Address, *big.Int) bool
// TransferFunc is the signature of a transfer function
TransferFunc func(StateDB, common.Address, common.Address, *big.Int)
// GetHashFunc returns the nth block hash in the blockchain
// and is used by the BLOCKHASH EVM op code.
GetHashFunc func(uint64) common.Hash
)
// run runs the given contract and takes care of running precompiles with a fallback to the byte code interpreter.
func run(evm *EVM, contract *Contract, input []byte, readOnly bool) ([]byte, error) {
if contract.CodeAddr != nil {
precompiles := PrecompiledContractsHomestead
if evm.ChainConfig().IsByzantium(evm.BlockNumber) {
precompiles = PrecompiledContractsByzantium
}
if p := precompiles[*contract.CodeAddr]; p != nil {
return RunPrecompiledContract(p, input, contract)
}
}
for _, interpreter := range evm.interpreters {
if interpreter.CanRun(contract.Code) {
if evm.interpreter != interpreter {
// Ensure that the interpreter pointer is set back
// to its current value upon return.
defer func(i Interpreter) {
evm.interpreter = i
}(evm.interpreter)
evm.interpreter = interpreter
}
return interpreter.Run(contract, input, readOnly)
}
}
return nil, ErrNoCompatibleInterpreter
}
// Context provides the EVM with auxiliary information. Once provided
// it shouldn't be modified.
type Context struct {
// CanTransfer returns whether the account contains
// sufficient ether to transfer the value
CanTransfer CanTransferFunc
// Transfer transfers ether from one account to the other
Transfer TransferFunc
// GetHash returns the hash corresponding to n
GetHash GetHashFunc
// Message information
Origin common.Address // Provides information for ORIGIN
GasPrice *big.Int // Provides information for GASPRICE
// Block information
Coinbase common.Address // Provides information for COINBASE
GasLimit uint64 // Provides information for GASLIMIT
BlockNumber *big.Int // Provides information for NUMBER
Time *big.Int // Provides information for TIME
Difficulty *big.Int // Provides information for DIFFICULTY
}
// EVM is the Ethereum Virtual Machine base object and provides
// the necessary tools to run a contract on the given state with
// the provided context. It should be noted that any error
// generated through any of the calls should be considered a
// revert-state-and-consume-all-gas operation, no checks on
// specific errors should ever be performed. The interpreter makes
// sure that any errors generated are to be considered faulty code.
//
// The EVM should never be reused and is not thread safe.
type EVM struct {
// Context provides auxiliary blockchain related information
Context
// StateDB gives access to the underlying state
StateDB StateDB
// Depth is the current call stack
depth int
// chainConfig contains information about the current chain
chainConfig *params.ChainConfig
// chain rules contains the chain rules for the current epoch
chainRules params.Rules
// virtual machine configuration options used to initialise the
// evm.
vmConfig Config
// global (to this context) ethereum virtual machine
// used throughout the execution of the tx.
interpreters []Interpreter
interpreter Interpreter
// abort is used to abort the EVM calling operations
// NOTE: must be set atomically
abort int32
// callGasTemp holds the gas available for the current call. This is needed because the
// available gas is calculated in gasCall* according to the 63/64 rule and later
// applied in opCall*.
callGasTemp uint64
}
// NewEVM returns a new EVM. The returned EVM is not thread safe and should
// only ever be used *once*.
func NewEVM(ctx Context, statedb StateDB, chainConfig *params.ChainConfig, vmConfig Config) *EVM {
evm := &EVM{
Context: ctx,
StateDB: statedb,
vmConfig: vmConfig,
chainConfig: chainConfig,
chainRules: chainConfig.Rules(ctx.BlockNumber),
interpreters: make([]Interpreter, 0, 1),
}
if chainConfig.IsEWASM(ctx.BlockNumber) {
// to be implemented by EVM-C and Wagon PRs.
// if vmConfig.EWASMInterpreter != "" {
// extIntOpts := strings.Split(vmConfig.EWASMInterpreter, ":")
// path := extIntOpts[0]
// options := []string{}
// if len(extIntOpts) > 1 {
// options = extIntOpts[1..]
// }
// evm.interpreters = append(evm.interpreters, NewEVMVCInterpreter(evm, vmConfig, options))
// } else {
// evm.interpreters = append(evm.interpreters, NewEWASMInterpreter(evm, vmConfig))
// }
panic("No supported ewasm interpreter yet.")
}
// vmConfig.EVMInterpreter will be used by EVM-C, it won't be checked here
// as we always want to have the built-in EVM as the failover option.
evm.interpreters = append(evm.interpreters, NewEVMInterpreter(evm, vmConfig))
evm.interpreter = evm.interpreters[0]
return evm
}
// Cancel cancels any running EVM operation. This may be called concurrently and
// it's safe to be called multiple times.
func (evm *EVM) Cancel() {
atomic.StoreInt32(&evm.abort, 1)
}
// Interpreter returns the current interpreter
func (evm *EVM) Interpreter() Interpreter {
return evm.interpreter
}
// Call executes the contract associated with the addr with the given input as
// parameters. It also handles any necessary value transfer required and takes
// the necessary steps to create accounts and reverses the state in case of an
// execution error or failed value transfer.
func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas uint64, value *big.Int) (ret []byte, leftOverGas uint64, err error) {
if evm.vmConfig.NoRecursion && evm.depth > 0 {
return nil, gas, nil
}
// Fail if we're trying to execute above the call depth limit
if evm.depth > int(params.CallCreateDepth) {
return nil, gas, ErrDepth
}
// Fail if we're trying to transfer more than the available balance
if !evm.Context.CanTransfer(evm.StateDB, caller.Address(), value) {
return nil, gas, ErrInsufficientBalance
}
var (
to = AccountRef(addr)
snapshot = evm.StateDB.Snapshot()
)
if !evm.StateDB.Exist(addr) {
precompiles := PrecompiledContractsHomestead
if evm.ChainConfig().IsByzantium(evm.BlockNumber) {
precompiles = PrecompiledContractsByzantium
}
if precompiles[addr] == nil && evm.ChainConfig().IsEIP158(evm.BlockNumber) && value.Sign() == 0 {
// Calling a non existing account, don't do anything, but ping the tracer
if evm.vmConfig.Debug && evm.depth == 0 {
evm.vmConfig.Tracer.CaptureStart(caller.Address(), addr, false, input, gas, value)
evm.vmConfig.Tracer.CaptureEnd(ret, 0, 0, nil)
}
return nil, gas, nil
}
evm.StateDB.CreateAccount(addr)
}
evm.Transfer(evm.StateDB, caller.Address(), to.Address(), value)
// Initialise a new contract and set the code that is to be used by the EVM.
// The contract is a scoped environment for this execution context only.
contract := NewContract(caller, to, value, gas)
contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
// Even if the account has no code, we need to continue because it might be a precompile
start := time.Now()
// Capture the tracer start/end events in debug mode
if evm.vmConfig.Debug && evm.depth == 0 {
evm.vmConfig.Tracer.CaptureStart(caller.Address(), addr, false, input, gas, value)
defer func() { // Lazy evaluation of the parameters
evm.vmConfig.Tracer.CaptureEnd(ret, gas-contract.Gas, time.Since(start), err)
}()
}
ret, err = run(evm, contract, input, false)
// When an error was returned by the EVM or when setting the creation code
// above we revert to the snapshot and consume any gas remaining. Additionally
// when we're in homestead this also counts for code storage gas errors.
if err != nil {
evm.StateDB.RevertToSnapshot(snapshot)
if err != errExecutionReverted {
contract.UseGas(contract.Gas)
}
}
return ret, contract.Gas, err
}
// CallCode executes the contract associated with the addr with the given input
// as parameters. It also handles any necessary value transfer required and takes
// the necessary steps to create accounts and reverses the state in case of an
// execution error or failed value transfer.
//
// CallCode differs from Call in the sense that it executes the given address'
// code with the caller as context.
func (evm *EVM) CallCode(caller ContractRef, addr common.Address, input []byte, gas uint64, value *big.Int) (ret []byte, leftOverGas uint64, err error) {
if evm.vmConfig.NoRecursion && evm.depth > 0 {
return nil, gas, nil
}
// Fail if we're trying to execute above the call depth limit
if evm.depth > int(params.CallCreateDepth) {
return nil, gas, ErrDepth
}
// Fail if we're trying to transfer more than the available balance
if !evm.CanTransfer(evm.StateDB, caller.Address(), value) {
return nil, gas, ErrInsufficientBalance
}
var (
snapshot = evm.StateDB.Snapshot()
to = AccountRef(caller.Address())
)
// initialise a new contract and set the code that is to be used by the
// EVM. The contract is a scoped environment for this execution context
// only.
contract := NewContract(caller, to, value, gas)
contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
ret, err = run(evm, contract, input, false)
if err != nil {
evm.StateDB.RevertToSnapshot(snapshot)
if err != errExecutionReverted {
contract.UseGas(contract.Gas)
}
}
return ret, contract.Gas, err
}
// DelegateCall executes the contract associated with the addr with the given input
// as parameters. It reverses the state in case of an execution error.
//
// DelegateCall differs from CallCode in the sense that it executes the given address'
// code with the caller as context and the caller is set to the caller of the caller.
func (evm *EVM) DelegateCall(caller ContractRef, addr common.Address, input []byte, gas uint64) (ret []byte, leftOverGas uint64, err error) {
if evm.vmConfig.NoRecursion && evm.depth > 0 {
return nil, gas, nil
}
// Fail if we're trying to execute above the call depth limit
if evm.depth > int(params.CallCreateDepth) {
return nil, gas, ErrDepth
}
var (
snapshot = evm.StateDB.Snapshot()
to = AccountRef(caller.Address())
)
// Initialise a new contract and make initialise the delegate values
contract := NewContract(caller, to, nil, gas).AsDelegate()
contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
ret, err = run(evm, contract, input, false)
if err != nil {
evm.StateDB.RevertToSnapshot(snapshot)
if err != errExecutionReverted {
contract.UseGas(contract.Gas)
}
}
return ret, contract.Gas, err
}
// StaticCall executes the contract associated with the addr with the given input
// as parameters while disallowing any modifications to the state during the call.
// Opcodes that attempt to perform such modifications will result in exceptions
// instead of performing the modifications.
func (evm *EVM) StaticCall(caller ContractRef, addr common.Address, input []byte, gas uint64) (ret []byte, leftOverGas uint64, err error) {
if evm.vmConfig.NoRecursion && evm.depth > 0 {
return nil, gas, nil
}
// Fail if we're trying to execute above the call depth limit
if evm.depth > int(params.CallCreateDepth) {
return nil, gas, ErrDepth
}
var (
to = AccountRef(addr)
snapshot = evm.StateDB.Snapshot()
)
// Initialise a new contract and set the code that is to be used by the
// EVM. The contract is a scoped environment for this execution context
// only.
contract := NewContract(caller, to, new(big.Int), gas)
contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
// We do an AddBalance of zero here, just in order to trigger a touch.
// This doesn't matter on Mainnet, where all empties are gone at the time of Byzantium,
// but is the correct thing to do and matters on other networks, in tests, and potential
// future scenarios
evm.StateDB.AddBalance(addr, bigZero)
// When an error was returned by the EVM or when setting the creation code
// above we revert to the snapshot and consume any gas remaining. Additionally
// when we're in Homestead this also counts for code storage gas errors.
ret, err = run(evm, contract, input, true)
if err != nil {
evm.StateDB.RevertToSnapshot(snapshot)
if err != errExecutionReverted {
contract.UseGas(contract.Gas)
}
}
return ret, contract.Gas, err
}
type codeAndHash struct {
code []byte
hash common.Hash
}
func (c *codeAndHash) Hash() common.Hash {
if c.hash == (common.Hash{}) {
c.hash = crypto.Keccak256Hash(c.code)
}
return c.hash
}
// create creates a new contract using code as deployment code.
func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64, value *big.Int, address common.Address) ([]byte, common.Address, uint64, error) {
// Depth check execution. Fail if we're trying to execute above the
// limit.
if evm.depth > int(params.CallCreateDepth) {
return nil, common.Address{}, gas, ErrDepth
}
if !evm.CanTransfer(evm.StateDB, caller.Address(), value) {
return nil, common.Address{}, gas, ErrInsufficientBalance
}
nonce := evm.StateDB.GetNonce(caller.Address())
evm.StateDB.SetNonce(caller.Address(), nonce+1)
// Ensure there's no existing contract already at the designated address
contractHash := evm.StateDB.GetCodeHash(address)
if evm.StateDB.GetNonce(address) != 0 || (contractHash != (common.Hash{}) && contractHash != emptyCodeHash) {
return nil, common.Address{}, 0, ErrContractAddressCollision
}
// Create a new account on the state
snapshot := evm.StateDB.Snapshot()
evm.StateDB.CreateAccount(address)
if evm.ChainConfig().IsEIP158(evm.BlockNumber) {
evm.StateDB.SetNonce(address, 1)
}
evm.Transfer(evm.StateDB, caller.Address(), address, value)
// initialise a new contract and set the code that is to be used by the
// EVM. The contract is a scoped environment for this execution context
// only.
contract := NewContract(caller, AccountRef(address), value, gas)
contract.SetCodeOptionalHash(&address, codeAndHash)
if evm.vmConfig.NoRecursion && evm.depth > 0 {
return nil, address, gas, nil
}
if evm.vmConfig.Debug && evm.depth == 0 {
evm.vmConfig.Tracer.CaptureStart(caller.Address(), address, true, codeAndHash.code, gas, value)
}
start := time.Now()
ret, err := run(evm, contract, nil, false)
// check whether the max code size has been exceeded
maxCodeSizeExceeded := evm.ChainConfig().IsEIP158(evm.BlockNumber) && len(ret) > params.MaxCodeSize
// if the contract creation ran successfully and no errors were returned
// calculate the gas required to store the code. If the code could not
// be stored due to not enough gas set an error and let it be handled
// by the error checking condition below.
if err == nil && !maxCodeSizeExceeded {
createDataGas := uint64(len(ret)) * params.CreateDataGas
if contract.UseGas(createDataGas) {
evm.StateDB.SetCode(address, ret)
} else {
err = ErrCodeStoreOutOfGas
}
}
// When an error was returned by the EVM or when setting the creation code
// above we revert to the snapshot and consume any gas remaining. Additionally
// when we're in homestead this also counts for code storage gas errors.
if maxCodeSizeExceeded || (err != nil && (evm.ChainConfig().IsHomestead(evm.BlockNumber) || err != ErrCodeStoreOutOfGas)) {
evm.StateDB.RevertToSnapshot(snapshot)
if err != errExecutionReverted {
contract.UseGas(contract.Gas)
}
}
// Assign err if contract code size exceeds the max while the err is still empty.
if maxCodeSizeExceeded && err == nil {
err = errMaxCodeSizeExceeded
}
if evm.vmConfig.Debug && evm.depth == 0 {
evm.vmConfig.Tracer.CaptureEnd(ret, gas-contract.Gas, time.Since(start), err)
}
return ret, address, contract.Gas, err
}
// Create creates a new contract using code as deployment code.
func (evm *EVM) Create(caller ContractRef, code []byte, gas uint64, value *big.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error) {
contractAddr = crypto.CreateAddress(caller.Address(), evm.StateDB.GetNonce(caller.Address()))
return evm.create(caller, &codeAndHash{code: code}, gas, value, contractAddr)
}
// Create2 creates a new contract using code as deployment code.
//
// The different between Create2 with Create is Create2 uses sha3(0xff ++ msg.sender ++ salt ++ sha3(init_code))[12:]
// instead of the usual sender-and-nonce-hash as the address where the contract is initialized at.
func (evm *EVM) Create2(caller ContractRef, code []byte, gas uint64, endowment *big.Int, salt *big.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error) {
codeAndHash := &codeAndHash{code: code}
contractAddr = crypto.CreateAddress2(caller.Address(), common.BigToHash(salt), codeAndHash.Hash().Bytes())
return evm.create(caller, codeAndHash, gas, endowment, contractAddr)
}
// ChainConfig returns the environment's chain configuration
func (evm *EVM) ChainConfig() *params.ChainConfig { return evm.chainConfig }
// ApplyStorageContractTransaction distinguish and execute transactions
func (evm *EVM) ApplyStorageContractTransaction(caller ContractRef, txType string, data []byte, gas uint64) (ret []byte, leftOverGas uint64, err error) {
stateSnap := evm.StateDB.Snapshot()
defer func() {
if err != nil {
evm.StateDB.RevertToSnapshot(stateSnap)
}
}()
switch txType {
case HostAnnounceTransaction:
return evm.HostAnnounceTx(caller, data, gas)
case ContractCreateTransaction:
return evm.CreateContractTx(caller, data, gas)
case CommitRevisionTransaction:
return evm.CommitRevisionTx(caller, data, gas)
case StorageProofTransaction:
return evm.StorageProofTx(caller, data, gas)
default:
return nil, gas, errUnknownStorageContractTx
}
}
// ApplyDposTransaction handlers all dpos consensus txs
func (evm *EVM) ApplyDposTransaction(txType string, dposContext *types.DposContext, from common.Address, data []byte, gas uint64, value *big.Int) (ret []byte, leftOverGas uint64, err error) {
dposSnap := dposContext.Snapshot()
stateSnap := evm.StateDB.Snapshot()
defer func() {
if err != nil {
dposContext.RevertToSnapShot(dposSnap)
evm.StateDB.RevertToSnapshot(stateSnap)
}
}()
switch txType {
case ApplyCandidate:
return evm.CandidateTx(from, data, gas, dposContext)
case CancelCandidate:
return evm.CandidateCancelTx(from, gas, dposContext)
case Vote:
return evm.VoteTx(from, dposContext, data, gas)
case CancelVote:
return evm.CancelVoteTx(from, dposContext, gas)
default:
return nil, gas, errUnknownDposOperationTx
}
}
// HostAnnounceTx host declares its own information on the chain
func (evm *EVM) HostAnnounceTx(caller ContractRef, data []byte, gas uint64) ([]byte, uint64, error) {
log.Trace("Enter host announce tx executing ... ")
ha := types.HostAnnouncement{}
gasDecode, resultDecode := RemainGas(gas, rlp.DecodeBytes, data, &ha)
errDec, _ := resultDecode[0].(error)
if errDec != nil {
return nil, gasDecode, errDec
}
gasCheck, resultCheck := RemainGas(gasDecode, CheckMultiSignatures, ha, [][]byte{ha.Signature})
errCheck, _ := resultCheck[0].(error)
if errCheck != nil {
log.Error("Failed to check signature for host announce", "err", errCheck)
return nil, gasCheck, errCheck
}
log.Trace("Host announce tx execution done", "remain_gas", gasCheck, "host_address", ha.NetAddress)
// return remain gas if everything is ok
return nil, gasCheck, nil
}
// CreateContractTx executes contract creation tx
func (evm *EVM) CreateContractTx(caller ContractRef, data []byte, gas uint64) ([]byte, uint64, error) {
log.Trace("Enter create contract tx executing ... ")
var (
stateDB = evm.StateDB
snapshot = stateDB.Snapshot()
)
// rlp decode and calculate gas used
sc := types.StorageContract{}
gasRemainDecode, resultDecode := RemainGas(gas, rlp.DecodeBytes, data, &sc)
errDecode, _ := resultDecode[0].(error)
if errDecode != nil {
return nil, gasRemainDecode, errDecode
}
// create the expired storage contract status address (e.g. "expired_storage_contract_1500")
windowEndStr := strconv.FormatUint(sc.WindowEnd, 10)
statusAddr := common.BytesToAddress([]byte(coinchargemaintenance.StrPrefixExpSC + windowEndStr))
// create storage contract address, directly use the contract ID
scID := sc.ID()
contractAddr := common.BytesToAddress(scID[12:])
// if the account not exist, create it
if !stateDB.Exist(statusAddr) {
stateDB.CreateAccount(statusAddr)
// before reaching the height windowEnd, mark statusAddr as not empty account to avoid being deleted by stateDB
stateDB.SetNonce(statusAddr, 1)
}
// check if this storage contract exist
if stateDB.Exist(contractAddr) {
return nil, gasRemainDecode, errors.New("this storage contract already exist")
}
stateDB.CreateAccount(contractAddr)
// before this contract finished, mark contractAddr as not empty account to avoid being deleted by stateDB
stateDB.SetNonce(contractAddr, 1)
// check form contract and calculate gas used
currentHeight := evm.BlockNumber.Uint64()
gasRemainCheck, resultCheck := RemainGas(gasRemainDecode, CheckCreateContract, stateDB, sc, uint64(currentHeight))
errCheck, _ := resultCheck[0].(error)
if errCheck != nil {
stateDB.RevertToSnapshot(snapshot)
log.Error("Failed to check create contract", "err", errCheck)
return nil, gasRemainCheck, errCheck
}
// set balances
clientAddr := sc.ClientCollateral.Address
hostAddr := sc.HostCollateral.Address
clientCollateralAmount := sc.ClientCollateral.Value
hostCollateralAmount := sc.HostCollateral.Value
stateDB.SubBalance(clientAddr, clientCollateralAmount)
stateDB.SubBalance(hostAddr, hostCollateralAmount)
totalCollateral := new(big.Int).Add(clientCollateralAmount, hostCollateralAmount)
stateDB.AddBalance(contractAddr, totalCollateral)
// mark this new storage contract as not proofed
notProofedStatus := append(coinchargemaintenance.NotProofedStatus, contractAddr[:]...)
stateDB.SetState(statusAddr, scID, common.BytesToHash(notProofedStatus))
// store storage contract in this contractAddr's stateDB
stateDB.SetState(contractAddr, coinchargemaintenance.KeyClientAddress, common.BytesToHash(sc.ClientCollateral.Address.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyHostAddress, common.BytesToHash(sc.HostCollateral.Address.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyClientCollateral, common.BytesToHash(sc.ClientCollateral.Value.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyHostCollateral, common.BytesToHash(sc.HostCollateral.Value.Bytes()))
uintBytes := Uint64ToBytes(sc.FileSize)
stateDB.SetState(contractAddr, coinchargemaintenance.KeyFileSize, common.BytesToHash(uintBytes))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyUnlockHash, sc.UnlockHash)
stateDB.SetState(contractAddr, coinchargemaintenance.KeyFileMerkleRoot, sc.FileMerkleRoot)
uintBytes = Uint64ToBytes(sc.RevisionNumber)
stateDB.SetState(contractAddr, coinchargemaintenance.KeyRevisionNumber, common.BytesToHash(uintBytes))
uintBytes = Uint64ToBytes(sc.WindowStart)
stateDB.SetState(contractAddr, coinchargemaintenance.KeyWindowStart, common.BytesToHash(uintBytes))
uintBytes = Uint64ToBytes(sc.WindowEnd)
stateDB.SetState(contractAddr, coinchargemaintenance.KeyWindowEnd, common.BytesToHash(uintBytes))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyClientValidProofOutput, common.BytesToHash(sc.ValidProofOutputs[0].Value.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyHostValidProofOutput, common.BytesToHash(sc.ValidProofOutputs[1].Value.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyClientMissedProofOutput, common.BytesToHash(sc.MissedProofOutputs[0].Value.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyHostMissedProofOutput, common.BytesToHash(sc.MissedProofOutputs[1].Value.Bytes()))
// return remain gas if everything is ok
log.Trace("Create contract tx execution done", "remain_gas", gasRemainCheck, "storage_contract_id", scID.Hex())
return nil, gasRemainCheck, nil
}
// CommitRevisionTx host sends a revision transaction
func (evm *EVM) CommitRevisionTx(caller ContractRef, data []byte, gas uint64) ([]byte, uint64, error) {
log.Trace("Enter storage contract revision tx executing ... ")
var (
stateDB = evm.StateDB
)
scr := types.StorageContractRevision{}
gasRemainDecode, resultDecode := RemainGas(gas, rlp.DecodeBytes, data, &scr)
errDec, _ := resultDecode[0].(error)
if errDec != nil {
return nil, gasRemainDecode, errDec
}
// check if the account exist
contractAddr := common.BytesToAddress(scr.ParentID.Bytes()[12:])
if !stateDB.Exist(contractAddr) {
return nil, gasRemainDecode, errors.New("no this storage contract account")
}
// check storage contract reversion and calculate gas used
currentHeight := evm.BlockNumber.Uint64()
gasRemainCheck, resultCheck := RemainGas(gasRemainDecode, CheckRevisionContract, stateDB, scr, uint64(currentHeight), contractAddr)
errCheck, _ := resultCheck[0].(error)
if errCheck != nil {
log.Error("Failed to check storage contract revision", "err", errCheck)
return nil, gasRemainCheck, errCheck
}
// update revision info
uintBytes := Uint64ToBytes(scr.NewFileSize)
stateDB.SetState(contractAddr, coinchargemaintenance.KeyFileSize, common.BytesToHash(uintBytes))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyFileMerkleRoot, scr.NewFileMerkleRoot)
uintBytes = Uint64ToBytes(scr.NewRevisionNumber)
stateDB.SetState(contractAddr, coinchargemaintenance.KeyRevisionNumber, common.BytesToHash(uintBytes))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyClientValidProofOutput, common.BytesToHash(scr.NewValidProofOutputs[0].Value.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyHostValidProofOutput, common.BytesToHash(scr.NewValidProofOutputs[1].Value.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyClientMissedProofOutput, common.BytesToHash(scr.NewMissedProofOutputs[0].Value.Bytes()))
stateDB.SetState(contractAddr, coinchargemaintenance.KeyHostMissedProofOutput, common.BytesToHash(scr.NewMissedProofOutputs[1].Value.Bytes()))
log.Trace("Storage contract reversion tx execution done", "remain_gas", gasRemainCheck, "storage_contract_id", scr.ParentID.Hex())
return nil, gasRemainCheck, nil
}
// StorageProofTx host send storage certificate transaction
func (evm *EVM) StorageProofTx(caller ContractRef, data []byte, gas uint64) ([]byte, uint64, error) {
log.Trace("Enter storage proof tx executing ... ")
var (
stateDB = evm.StateDB
)
sp := types.StorageProof{}
gasRemainDec, resultDec := RemainGas(gas, rlp.DecodeBytes, data, &sp)
errDec, _ := resultDec[0].(error)
if errDec != nil {
return nil, gasRemainDec, errDec
}
currentHeight := evm.BlockNumber.Uint64()
contractAddr := common.BytesToAddress(sp.ParentID[12:])
if !stateDB.Exist(contractAddr) {
return nil, gasRemainDec, errors.New("no this storage contract account")
}
// retrieve origin data in storage contract
windowEndHash := stateDB.GetState(contractAddr, coinchargemaintenance.KeyWindowEnd)
clientValidOutputHash := stateDB.GetState(contractAddr, coinchargemaintenance.KeyClientValidProofOutput)
hostValidOutputHash := stateDB.GetState(contractAddr, coinchargemaintenance.KeyHostValidProofOutput)
clientAddressHash := stateDB.GetState(contractAddr, coinchargemaintenance.KeyClientAddress)
hostAddressHash := stateDB.GetState(contractAddr, coinchargemaintenance.KeyHostAddress)
// get status account address
windowEnd := new(big.Int).SetBytes(windowEndHash.Bytes()).Uint64()
windowEndStr := strconv.FormatUint(windowEnd, 10)
statusAddr := common.BytesToAddress([]byte(coinchargemaintenance.StrPrefixExpSC + windowEndStr))
gasRemainCheck, resultCheck := RemainGas(gasRemainDec, CheckStorageProof, stateDB, sp, uint64(currentHeight), statusAddr, contractAddr)
errCheck, _ := resultCheck[0].(error)
if errCheck != nil {
return nil, gasRemainCheck, errCheck
}
// effect valid proof outputs, first for client, second for host
clientValidOutput := new(big.Int).SetBytes(clientValidOutputHash.Bytes())
clientAddress := common.BytesToAddress(clientAddressHash.Bytes())
stateDB.AddBalance(clientAddress, clientValidOutput)
hostValidOutput := new(big.Int).SetBytes(hostValidOutputHash.Bytes())
hostAddress := common.BytesToAddress(hostAddressHash.Bytes())
stateDB.AddBalance(hostAddress, hostValidOutput)
totalValue := new(big.Int).SetInt64(0)
totalValue.Add(clientValidOutput, hostValidOutput)
stateDB.SubBalance(contractAddr, totalValue)
// set completed for this storage contract
proofedStatus := append(coinchargemaintenance.ProofedStatus, contractAddr[:]...)
stateDB.SetState(statusAddr, sp.ParentID, common.BytesToHash(proofedStatus))
// this contract is finished, so mark it empty account that will be deleted by stateDB
stateDB.SetNonce(contractAddr, 0)
log.Trace("Storage proof tx execution done", "storage_contract_id", sp.ParentID.Hex())
return nil, gasRemainCheck, nil
}
// Uint64ToBytes convert uint64 to bytes
func Uint64ToBytes(i uint64) []byte {
var buf = make([]byte, 8)
binary.BigEndian.PutUint64(buf, i)
return buf
}
// CandidateTx campaign becomes a candidate and pledges part of the assets.
func (evm *EVM) CandidateTx(caller common.Address, data []byte, gas uint64, dposContext *types.DposContext) ([]byte, uint64, error) {
log.Trace("Enter candidate tx executing ... ")
var voteData *types.AddCandidateTxData
gasRemainDec, resultDec := RemainGas(gas, rlp.DecodeBytes, data, &voteData)
errDec, _ := resultDec[0].(error)
if errDec != nil {
return nil, gasRemainDec, errDec
}
// Add candidate in dpos
if err := dpos.ProcessAddCandidate(evm.StateDB, dposContext, caller, voteData.Deposit, voteData.RewardRatio); err != nil {
return nil, gasRemainDec, err
}
// defines that dposCtx.BecomeCandidate and SetState all cost params.SstoreSetGas
ok, gasRemain := DeductGas(gasRemainDec, params.SstoreSetGas*3)
if !ok {
return nil, gasRemainDec, ErrOutOfGas
}
log.Trace("Candidate tx execution done")
return nil, gasRemain, nil
}
// CandidateCancelTx cancellation of candidate thawing assets requires a defrosting period.
func (evm *EVM) CandidateCancelTx(caller common.Address, gas uint64, dposContext *types.DposContext) ([]byte, uint64, error) {
log.Trace("Enter cancel candidate tx executing ... ")
if err := dpos.ProcessCancelCandidate(evm.StateDB, dposContext, caller, evm.Time.Int64()); err != nil {
return nil, gas, err
}
// defines that dposCtx.KickoutCandidate and markThawingAddress all cost params.SstoreSetGas
ok, gasRemain := DeductGas(gas, params.SstoreSetGas*2)
if !ok {
return nil, gas, ErrOutOfGas
}
log.Trace("Cancel candidate tx execution done")
return nil, gasRemain, nil
}
// VoteTx handles a new vote to some candidates that will remove last vote records
func (evm *EVM) VoteTx(caller common.Address, dposCtx *types.DposContext, data []byte, gas uint64) ([]byte, uint64, error) {
log.Trace("Enter vote tx executing ... ")
var voteData *types.VoteTxData
gasRemainDec, resultDec := RemainGas(gas, rlp.DecodeBytes, data, &voteData)
errDec, _ := resultDec[0].(error)
if errDec != nil {
return nil, gasRemainDec, errDec
}
successVote, err := dpos.ProcessVote(evm.StateDB, dposCtx, caller, voteData.Deposit, voteData.Candidates, evm.Time.Int64())
if err != nil {
return nil, gasRemainDec, err
}
// defines that dposCtx.Vote and SetState all cost params.SstoreSetGas
ok, gasRemain := DeductGas(gasRemainDec, params.SstoreSetGas*4)
if !ok {
return nil, gasRemainDec, ErrOutOfGas
}
log.Trace("Vote tx execution done", "vote_count", successVote)
return nil, gasRemain, nil
}
// CancelVoteTx handles a cancel vote tx that will remove all vote records
func (evm *EVM) CancelVoteTx(caller common.Address, dposCtx *types.DposContext, gas uint64) ([]byte, uint64, error) {
log.Trace("Enter cancel vote tx executing ... ")
// remove all vote record from dpos context
if err := dpos.ProcessCancelVote(evm.StateDB, dposCtx, caller, evm.Time.Int64()); err != nil {
return nil, gas, err
}
ok, gasRemain := DeductGas(gas, params.SstoreSetGas*2)
if !ok {
return nil, gas, ErrOutOfGas
}
log.Trace("Cancel vote tx execution done")
return nil, gasRemain, nil
}