laconicd-deprecated/app/ante/eth.go
Federico Kunze 9a5654f70d
ante: AnteHandler changes from state transition refactor (#56)
* ante: cherry-pick changes from state transition refactor

* ante: test setup

* ante: fixes

* ante: test (wip)

* ante: finish unit tests

* ante: intrinsic gas test

* ante: chaindecorators test (wip)

* update tests

* ante: cleanup tests

* ante: add test consuption test
2021-05-31 05:05:32 -04:00

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package ante
import (
"math/big"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
evmtypes "github.com/cosmos/ethermint/x/evm/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
ethtypes "github.com/ethereum/go-ethereum/core/types"
)
// EVMKeeper defines the expected keeper interface used on the Eth AnteHandler
type EVMKeeper interface {
ChainID() *big.Int
GetParams(ctx sdk.Context) evmtypes.Params
GetChainConfig(ctx sdk.Context) (evmtypes.ChainConfig, bool)
WithContext(ctx sdk.Context)
ResetRefundTransient(ctx sdk.Context)
}
// EthSigVerificationDecorator validates an ethereum signature
type EthSigVerificationDecorator struct {
evmKeeper EVMKeeper
}
// NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator
func NewEthSigVerificationDecorator(ek EVMKeeper) EthSigVerificationDecorator {
return EthSigVerificationDecorator{
evmKeeper: ek,
}
}
// AnteHandle validates checks that the registered chain id is the same as the one on the message, and
// that the signer address matches the one defined on the message.
func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
// no need to verify signatures on recheck tx
if ctx.IsReCheckTx() {
return next(ctx, tx, simulate)
}
// get and set account must be called with an infinite gas meter in order to prevent
// additional gas from being deducted.
infCtx := ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
chainID := esvd.evmKeeper.ChainID()
config, found := esvd.evmKeeper.GetChainConfig(infCtx)
if !found {
return ctx, evmtypes.ErrChainConfigNotFound
}
ethCfg := config.EthereumConfig(chainID)
blockNum := big.NewInt(ctx.BlockHeight())
signer := ethtypes.MakeSigner(ethCfg, blockNum)
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, &evmtypes.MsgEthereumTx{})
}
if _, err := signer.Sender(msgEthTx.AsTransaction()); err != nil {
return ctx, sdkerrors.Wrap(sdkerrors.ErrorInvalidSigner, err.Error())
}
}
return next(ctx, tx, simulate)
}
// EthAccountVerificationDecorator validates an account balance checks
type EthAccountVerificationDecorator struct {
ak AccountKeeper
bankKeeper BankKeeper
evmKeeper EVMKeeper
}
// NewEthAccountVerificationDecorator creates a new EthAccountVerificationDecorator
func NewEthAccountVerificationDecorator(ak AccountKeeper, bankKeeper BankKeeper, ek EVMKeeper) EthAccountVerificationDecorator {
return EthAccountVerificationDecorator{
ak: ak,
bankKeeper: bankKeeper,
evmKeeper: ek,
}
}
// AnteHandle validates the signature and returns sender address
func (avd EthAccountVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
if !ctx.IsCheckTx() {
return next(ctx, tx, simulate)
}
// get and set account must be called with an infinite gas meter in order to prevent
// additional gas from being deducted.
infCtx := ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
evmDenom := avd.evmKeeper.GetParams(infCtx).EvmDenom
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, &evmtypes.MsgEthereumTx{})
}
// sender address should be in the tx cache from the previous AnteHandle call
from := msgEthTx.GetFrom()
if from.Empty() {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrInvalidAddress, "from address cannot be empty")
}
acc := avd.ak.GetAccount(infCtx, from)
if acc == nil {
_ = avd.ak.NewAccountWithAddress(infCtx, from)
}
// validate sender has enough funds to pay for gas cost
balance := avd.bankKeeper.GetBalance(infCtx, from, evmDenom)
if balance.Amount.BigInt().Cmp(msgEthTx.Cost()) < 0 {
return ctx, sdkerrors.Wrapf(
sdkerrors.ErrInsufficientFunds,
"sender balance < tx gas cost (%s < %s%s)", balance.String(), msgEthTx.Cost().String(), evmDenom,
)
}
}
return next(ctx, tx, simulate)
}
// EthNonceVerificationDecorator checks that the account nonce from the transaction matches
// the sender account sequence.
type EthNonceVerificationDecorator struct {
ak AccountKeeper
}
// NewEthNonceVerificationDecorator creates a new EthNonceVerificationDecorator
func NewEthNonceVerificationDecorator(ak AccountKeeper) EthNonceVerificationDecorator {
return EthNonceVerificationDecorator{
ak: ak,
}
}
// AnteHandle validates that the transaction nonce is valid (equivalent to the sender accounts
// current nonce).
func (nvd EthNonceVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
// no need to check the nonce on ReCheckTx
if ctx.IsReCheckTx() {
return next(ctx, tx, simulate)
}
// get and set account must be called with an infinite gas meter in order to prevent
// additional gas from being deducted.
infCtx := ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, &evmtypes.MsgEthereumTx{})
}
// sender address should be in the tx cache from the previous AnteHandle call
seq, err := nvd.ak.GetSequence(infCtx, msgEthTx.GetFrom())
if err != nil {
return ctx, err
}
// if multiple transactions are submitted in succession with increasing nonces,
// all will be rejected except the first, since the first needs to be included in a block
// before the sequence increments
if msgEthTx.Data.Nonce != seq {
return ctx, sdkerrors.Wrapf(
sdkerrors.ErrInvalidSequence,
"invalid nonce; got %d, expected %d", msgEthTx.Data.Nonce, seq,
)
}
}
return next(ctx, tx, simulate)
}
// EthGasConsumeDecorator validates enough intrinsic gas for the transaction and
// gas consumption.
type EthGasConsumeDecorator struct {
ak AccountKeeper
bankKeeper BankKeeper
evmKeeper EVMKeeper
}
// NewEthGasConsumeDecorator creates a new EthGasConsumeDecorator
func NewEthGasConsumeDecorator(ak AccountKeeper, bankKeeper BankKeeper, ek EVMKeeper) EthGasConsumeDecorator {
return EthGasConsumeDecorator{
ak: ak,
bankKeeper: bankKeeper,
evmKeeper: ek,
}
}
// AnteHandle validates that the Ethereum tx message has enough to cover intrinsic gas
// (during CheckTx only) and that the sender has enough balance to pay for the gas cost.
//
// Intrinsic gas for a transaction is the amount of gas
// that the transaction uses before the transaction is executed. The gas is a
// constant value of 21000 plus any cost inccured by additional bytes of data
// supplied with the transaction.
func (egcd EthGasConsumeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
// get and set account must be called with an infinite gas meter in order to prevent
// additional gas from being deducted.
infCtx := ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
if len(tx.GetMsgs()) != 1 {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "only 1 ethereum msg supported per tx, got %d", len(tx.GetMsgs()))
}
// reset the refund gas value for the current transaction
egcd.evmKeeper.ResetRefundTransient(infCtx)
config, found := egcd.evmKeeper.GetChainConfig(infCtx)
if !found {
return ctx, evmtypes.ErrChainConfigNotFound
}
ethCfg := config.EthereumConfig(egcd.evmKeeper.ChainID())
blockHeight := big.NewInt(ctx.BlockHeight())
homestead := ethCfg.IsHomestead(blockHeight)
istanbul := ethCfg.IsIstanbul(blockHeight)
for _, msg := range tx.GetMsgs() {
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, &evmtypes.MsgEthereumTx{})
}
isContractCreation := msgEthTx.To() == nil
// fetch sender account from signature
signerAcc, err := authante.GetSignerAcc(infCtx, egcd.ak, msgEthTx.GetFrom())
if err != nil {
return ctx, err
}
gasLimit := msgEthTx.GetGas()
var accessList ethtypes.AccessList
if msgEthTx.Data.Accesses != nil {
accessList = *msgEthTx.Data.Accesses.ToEthAccessList()
}
intrinsicGas, err := core.IntrinsicGas(msgEthTx.Data.Input, accessList, isContractCreation, homestead, istanbul)
if err != nil {
return ctx, sdkerrors.Wrap(err, "failed to compute intrinsic gas cost")
}
// intrinsic gas verification during CheckTx
if ctx.IsCheckTx() && gasLimit < intrinsicGas {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrOutOfGas, "gas limit too low: %d (gas limit) < %d (intrinsic gas)", gasLimit, intrinsicGas)
}
// Cost calculates the fees paid to validators based on gas limit and price
cost := msgEthTx.Fee() // fee = gas limit * gas price
evmDenom := egcd.evmKeeper.GetParams(infCtx).EvmDenom
feeAmt := sdk.Coins{sdk.NewCoin(evmDenom, sdk.NewIntFromBigInt(cost))}
// deduct the full gas cost from the user balance
if err := authante.DeductFees(egcd.bankKeeper, infCtx, signerAcc, feeAmt); err != nil {
return ctx, err
}
// consume intrinsic gas for the current transaction. After runTx is executed on Baseapp, the
// application will consume gas from the block gas pool.
ctx.GasMeter().ConsumeGas(intrinsicGas, "intrinsic gas")
}
// generate a copy of the gas pool (i.e block gas meter) to see if we've run out of gas for this block
// if current gas consumed is greater than the limit, this funcion panics and the error is recovered on the Baseapp
gasPool := sdk.NewGasMeter(ctx.BlockGasMeter().Limit())
gasPool.ConsumeGas(ctx.GasMeter().GasConsumedToLimit(), "gas pool check")
// we know that we have enough gas on the pool to cover the intrinsic gas
// set up the updated context to the evm Keeper
egcd.evmKeeper.WithContext(ctx)
return next(ctx, tx, simulate)
}
// EthIncrementSenderSequenceDecorator increments the sequence of the signers. The
// main difference with the SDK's IncrementSequenceDecorator is that the MsgEthereumTx
// doesn't implement the SigVerifiableTx interface.
//
// CONTRACT: must be called after msg.VerifySig in order to cache the sender address.
type EthIncrementSenderSequenceDecorator struct {
ak AccountKeeper
}
// NewEthIncrementSenderSequenceDecorator creates a new EthIncrementSenderSequenceDecorator.
func NewEthIncrementSenderSequenceDecorator(ak AccountKeeper) EthIncrementSenderSequenceDecorator {
return EthIncrementSenderSequenceDecorator{
ak: ak,
}
}
// AnteHandle handles incrementing the sequence of the sender.
func (issd EthIncrementSenderSequenceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
// get and set account must be called with an infinite gas meter in order to prevent
// additional gas from being deducted.
infCtx := ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
for _, msg := range tx.GetMsgs() {
// increment sequence of all signers
for _, addr := range msg.GetSigners() {
acc := issd.ak.GetAccount(infCtx, addr)
if acc == nil {
return ctx, sdkerrors.Wrapf(
sdkerrors.ErrUnknownAddress,
"account %s (%s) is nil", common.BytesToAddress(addr.Bytes()), addr,
)
}
if err := acc.SetSequence(acc.GetSequence() + 1); err != nil {
return ctx, err
}
issd.ak.SetAccount(infCtx, acc)
}
}
// set the original gas meter
return next(ctx, tx, simulate)
}