2020-04-17 22:32:01 +00:00
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package ante
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import (
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"fmt"
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"math/big"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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"github.com/cosmos/cosmos-sdk/x/auth"
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authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
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"github.com/cosmos/cosmos-sdk/x/auth/types"
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2020-09-24 17:50:47 +00:00
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ethermint "github.com/cosmos/ethermint/types"
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2020-04-17 22:32:01 +00:00
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evmtypes "github.com/cosmos/ethermint/x/evm/types"
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2020-06-22 16:07:35 +00:00
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"github.com/ethereum/go-ethereum/common"
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2020-04-17 22:32:01 +00:00
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ethcore "github.com/ethereum/go-ethereum/core"
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)
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2020-09-02 19:41:05 +00:00
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// EVMKeeper defines the expected keeper interface used on the Eth AnteHandler
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type EVMKeeper interface {
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GetParams(ctx sdk.Context) evmtypes.Params
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}
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2020-04-17 22:32:01 +00:00
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// EthSetupContextDecorator sets the infinite GasMeter in the Context and wraps
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// the next AnteHandler with a defer clause to recover from any downstream
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// OutOfGas panics in the AnteHandler chain to return an error with information
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// on gas provided and gas used.
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// CONTRACT: Must be first decorator in the chain
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// CONTRACT: Tx must implement GasTx interface
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type EthSetupContextDecorator struct{}
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// NewEthSetupContextDecorator creates a new EthSetupContextDecorator
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func NewEthSetupContextDecorator() EthSetupContextDecorator {
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return EthSetupContextDecorator{}
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}
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// AnteHandle sets the infinite gas meter to done to ignore costs in AnteHandler checks.
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// This is undone at the EthGasConsumeDecorator, where the context is set with the
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// ethereum tx GasLimit.
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func (escd EthSetupContextDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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ctx = ctx.WithBlockGasMeter(sdk.NewInfiniteGasMeter())
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// all transactions must implement GasTx
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gasTx, ok := tx.(authante.GasTx)
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if !ok {
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return ctx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "Tx must be GasTx")
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}
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// Decorator will catch an OutOfGasPanic caused in the next antehandler
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// AnteHandlers must have their own defer/recover in order for the BaseApp
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// to know how much gas was used! This is because the GasMeter is created in
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// the AnteHandler, but if it panics the context won't be set properly in
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// runTx's recover call.
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defer func() {
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if r := recover(); r != nil {
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switch rType := r.(type) {
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case sdk.ErrorOutOfGas:
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log := fmt.Sprintf(
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"out of gas in location: %v; gasLimit: %d, gasUsed: %d",
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rType.Descriptor, gasTx.GetGas(), ctx.GasMeter().GasConsumed(),
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)
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err = sdkerrors.Wrap(sdkerrors.ErrOutOfGas, log)
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default:
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panic(r)
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}
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}
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}()
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return next(ctx, tx, simulate)
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}
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// EthMempoolFeeDecorator validates that sufficient fees have been provided that
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// meet a minimum threshold defined by the proposer (for mempool purposes during CheckTx).
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2020-09-02 19:41:05 +00:00
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type EthMempoolFeeDecorator struct {
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evmKeeper EVMKeeper
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}
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2020-04-17 22:32:01 +00:00
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// NewEthMempoolFeeDecorator creates a new EthMempoolFeeDecorator
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2020-09-02 19:41:05 +00:00
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func NewEthMempoolFeeDecorator(ek EVMKeeper) EthMempoolFeeDecorator {
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return EthMempoolFeeDecorator{
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evmKeeper: ek,
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}
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2020-04-17 22:32:01 +00:00
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}
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// AnteHandle verifies that enough fees have been provided by the
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// Ethereum transaction that meet the minimum threshold set by the block
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// proposer.
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//
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// NOTE: This should only be run during a CheckTx mode.
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func (emfd EthMempoolFeeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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if !ctx.IsCheckTx() {
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return next(ctx, tx, simulate)
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}
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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2020-09-02 19:41:05 +00:00
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evmDenom := emfd.evmKeeper.GetParams(ctx).EvmDenom
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2020-11-16 13:09:40 +00:00
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// fee = gas price * gas limit
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2020-09-02 19:41:05 +00:00
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fee := sdk.NewInt64DecCoin(evmDenom, msgEthTx.Fee().Int64())
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2020-04-17 22:32:01 +00:00
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minGasPrices := ctx.MinGasPrices()
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2020-11-16 13:09:40 +00:00
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minFees := minGasPrices.AmountOf(evmDenom).MulInt64(int64(msgEthTx.Data.GasLimit))
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2020-04-17 22:32:01 +00:00
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2020-11-16 13:09:40 +00:00
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// check that fee provided is greater than the minimum defined by the validator node
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// NOTE: we only check if the evm denom tokens are present in min gas prices. It is up to the
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2020-05-04 22:41:17 +00:00
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// sender if they want to send additional fees in other denominations.
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var hasEnoughFees bool
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2020-11-16 13:09:40 +00:00
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if fee.Amount.GTE(minFees) {
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2020-05-04 22:41:17 +00:00
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hasEnoughFees = true
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2020-04-17 22:32:01 +00:00
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}
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2020-11-16 13:09:40 +00:00
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// reject transaction if minimum gas price is not zero and the transaction does not
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2020-05-04 22:41:17 +00:00
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// meet the minimum fee
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if !ctx.MinGasPrices().IsZero() && !hasEnoughFees {
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2020-04-17 22:32:01 +00:00
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return ctx, sdkerrors.Wrap(
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sdkerrors.ErrInsufficientFee,
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fmt.Sprintf("insufficient fee, got: %q required: %q", fee, ctx.MinGasPrices()),
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)
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}
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return next(ctx, tx, simulate)
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}
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// EthSigVerificationDecorator validates an ethereum signature
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type EthSigVerificationDecorator struct{}
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// NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator
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func NewEthSigVerificationDecorator() EthSigVerificationDecorator {
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return EthSigVerificationDecorator{}
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}
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// AnteHandle validates the signature and returns sender address
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func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// parse the chainID from a string to a base-10 integer
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2020-09-24 17:50:47 +00:00
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chainIDEpoch, err := ethermint.ParseChainID(ctx.ChainID())
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if err != nil {
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return ctx, err
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2020-04-17 22:32:01 +00:00
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}
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2020-09-23 14:49:20 +00:00
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// validate sender/signature and cache the address
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2020-09-24 17:50:47 +00:00
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_, err = msgEthTx.VerifySig(chainIDEpoch)
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2020-04-17 22:32:01 +00:00
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if err != nil {
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2020-09-23 14:49:20 +00:00
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnauthorized, "signature verification failed: %s", err.Error())
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2020-04-17 22:32:01 +00:00
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}
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2020-05-04 22:41:17 +00:00
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// NOTE: when signature verification succeeds, a non-empty signer address can be
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// retrieved from the transaction on the next AnteDecorators.
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2020-04-17 22:32:01 +00:00
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return next(ctx, msgEthTx, simulate)
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}
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// AccountVerificationDecorator validates an account balance checks
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type AccountVerificationDecorator struct {
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2020-09-02 19:41:05 +00:00
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ak auth.AccountKeeper
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evmKeeper EVMKeeper
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2020-04-17 22:32:01 +00:00
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}
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// NewAccountVerificationDecorator creates a new AccountVerificationDecorator
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2020-09-02 19:41:05 +00:00
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func NewAccountVerificationDecorator(ak auth.AccountKeeper, ek EVMKeeper) AccountVerificationDecorator {
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2020-04-17 22:32:01 +00:00
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return AccountVerificationDecorator{
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2020-09-02 19:41:05 +00:00
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ak: ak,
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evmKeeper: ek,
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2020-04-17 22:32:01 +00:00
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}
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}
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// AnteHandle validates the signature and returns sender address
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func (avd AccountVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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if !ctx.IsCheckTx() {
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return next(ctx, tx, simulate)
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}
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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2020-05-04 22:41:17 +00:00
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// sender address should be in the tx cache from the previous AnteHandle call
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2020-04-17 22:32:01 +00:00
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address := msgEthTx.From()
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2020-05-04 22:41:17 +00:00
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if address.Empty() {
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panic("sender address cannot be empty")
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2020-04-17 22:32:01 +00:00
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}
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acc := avd.ak.GetAccount(ctx, address)
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if acc == nil {
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2020-09-17 22:04:36 +00:00
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acc = avd.ak.NewAccountWithAddress(ctx, address)
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avd.ak.SetAccount(ctx, acc)
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2020-04-17 22:32:01 +00:00
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}
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// on InitChain make sure account number == 0
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if ctx.BlockHeight() == 0 && acc.GetAccountNumber() != 0 {
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrInvalidSequence,
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"invalid account number for height zero (got %d)", acc.GetAccountNumber(),
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)
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}
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2020-09-02 19:41:05 +00:00
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evmDenom := avd.evmKeeper.GetParams(ctx).EvmDenom
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2020-05-04 22:41:17 +00:00
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// validate sender has enough funds to pay for gas cost
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2020-09-02 19:41:05 +00:00
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balance := acc.GetCoins().AmountOf(evmDenom)
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if balance.BigInt().Cmp(msgEthTx.Cost()) < 0 {
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2020-04-17 22:32:01 +00:00
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrInsufficientFunds,
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2020-09-02 19:41:05 +00:00
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"sender balance < tx gas cost (%s%s < %s%s)", balance.String(), evmDenom, msgEthTx.Cost().String(), evmDenom,
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2020-04-17 22:32:01 +00:00
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)
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}
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return next(ctx, tx, simulate)
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}
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2020-09-23 14:49:20 +00:00
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// NonceVerificationDecorator checks that the account nonce from the transaction matches
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2020-05-04 22:41:17 +00:00
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// the sender account sequence.
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2020-04-17 22:32:01 +00:00
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type NonceVerificationDecorator struct {
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ak auth.AccountKeeper
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}
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// NewNonceVerificationDecorator creates a new NonceVerificationDecorator
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func NewNonceVerificationDecorator(ak auth.AccountKeeper) NonceVerificationDecorator {
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return NonceVerificationDecorator{
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ak: ak,
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}
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}
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// AnteHandle validates that the transaction nonce is valid (equivalent to the sender account’s
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// current nonce).
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func (nvd NonceVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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2020-05-04 22:41:17 +00:00
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// sender address should be in the tx cache from the previous AnteHandle call
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2020-04-17 22:32:01 +00:00
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address := msgEthTx.From()
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2020-05-04 22:41:17 +00:00
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if address.Empty() {
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panic("sender address cannot be empty")
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2020-04-17 22:32:01 +00:00
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}
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acc := nvd.ak.GetAccount(ctx, address)
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if acc == nil {
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2020-09-23 14:49:20 +00:00
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrUnknownAddress,
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"account %s (%s) is nil", common.BytesToAddress(address.Bytes()), address,
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)
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2020-04-17 22:32:01 +00:00
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}
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seq := acc.GetSequence()
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2020-09-29 14:39:15 +00:00
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// if multiple transactions are submitted in succession with increasing nonces,
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// all will be rejected except the first, since the first needs to be included in a block
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// before the sequence increments
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if msgEthTx.Data.AccountNonce < seq {
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2020-09-23 14:49:20 +00:00
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return ctx, sdkerrors.Wrapf(
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2020-04-17 22:32:01 +00:00
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sdkerrors.ErrInvalidSequence,
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2020-09-23 14:49:20 +00:00
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"invalid nonce; got %d, expected %d", msgEthTx.Data.AccountNonce, seq,
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2020-04-17 22:32:01 +00:00
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)
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}
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return next(ctx, tx, simulate)
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}
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// EthGasConsumeDecorator validates enough intrinsic gas for the transaction and
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// gas consumption.
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type EthGasConsumeDecorator struct {
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2020-09-02 19:41:05 +00:00
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ak auth.AccountKeeper
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sk types.SupplyKeeper
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evmKeeper EVMKeeper
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2020-04-17 22:32:01 +00:00
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}
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// NewEthGasConsumeDecorator creates a new EthGasConsumeDecorator
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2020-09-02 19:41:05 +00:00
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func NewEthGasConsumeDecorator(ak auth.AccountKeeper, sk types.SupplyKeeper, ek EVMKeeper) EthGasConsumeDecorator {
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2020-04-17 22:32:01 +00:00
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return EthGasConsumeDecorator{
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2020-09-02 19:41:05 +00:00
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ak: ak,
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sk: sk,
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evmKeeper: ek,
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2020-04-17 22:32:01 +00:00
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}
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}
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// AnteHandle validates that the Ethereum tx message has enough to cover intrinsic gas
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// (during CheckTx only) and that the sender has enough balance to pay for the gas cost.
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//
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// Intrinsic gas for a transaction is the amount of gas
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// that the transaction uses before the transaction is executed. The gas is a
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// constant value of 21000 plus any cost inccured by additional bytes of data
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// supplied with the transaction.
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func (egcd EthGasConsumeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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2020-09-23 14:49:20 +00:00
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// sender address should be in the tx cache from the previous AnteHandle call
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2020-04-17 22:32:01 +00:00
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address := msgEthTx.From()
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2020-05-04 22:41:17 +00:00
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if address.Empty() {
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panic("sender address cannot be empty")
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2020-04-17 22:32:01 +00:00
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}
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2020-09-23 14:49:20 +00:00
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// fetch sender account from signature
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2020-04-17 22:32:01 +00:00
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senderAcc, err := auth.GetSignerAcc(ctx, egcd.ak, address)
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if err != nil {
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return ctx, err
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}
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if senderAcc == nil {
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2020-09-23 14:49:20 +00:00
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrUnknownAddress,
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"sender account %s (%s) is nil", common.BytesToAddress(address.Bytes()), address,
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)
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2020-04-17 22:32:01 +00:00
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}
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gasLimit := msgEthTx.GetGas()
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2020-04-23 17:21:23 +00:00
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gas, err := ethcore.IntrinsicGas(msgEthTx.Data.Payload, msgEthTx.To() == nil, true, false)
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2020-04-17 22:32:01 +00:00
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if err != nil {
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return ctx, sdkerrors.Wrap(err, "failed to compute intrinsic gas cost")
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}
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// intrinsic gas verification during CheckTx
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if ctx.IsCheckTx() && gasLimit < gas {
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2020-09-23 14:49:20 +00:00
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrOutOfGas, "intrinsic gas too low: %d < %d", gasLimit, gas)
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2020-04-17 22:32:01 +00:00
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}
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// Charge sender for gas up to limit
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if gasLimit != 0 {
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// Cost calculates the fees paid to validators based on gas limit and price
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cost := new(big.Int).Mul(msgEthTx.Data.Price, new(big.Int).SetUint64(gasLimit))
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2020-09-02 19:41:05 +00:00
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evmDenom := egcd.evmKeeper.GetParams(ctx).EvmDenom
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2020-04-17 22:32:01 +00:00
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feeAmt := sdk.NewCoins(
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2020-09-02 19:41:05 +00:00
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sdk.NewCoin(evmDenom, sdk.NewIntFromBigInt(cost)),
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2020-04-17 22:32:01 +00:00
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)
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err = auth.DeductFees(egcd.sk, ctx, senderAcc, feeAmt)
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if err != nil {
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return ctx, err
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}
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}
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// Set gas meter after ante handler to ignore gaskv costs
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newCtx = auth.SetGasMeter(simulate, ctx, gasLimit)
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return next(newCtx, tx, simulate)
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}
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// IncrementSenderSequenceDecorator increments the sequence of the signers. The
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// main difference with the SDK's IncrementSequenceDecorator is that the MsgEthereumTx
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// doesn't implement the SigVerifiableTx interface.
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//
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// CONTRACT: must be called after msg.VerifySig in order to cache the sender address.
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type IncrementSenderSequenceDecorator struct {
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ak auth.AccountKeeper
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}
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// NewIncrementSenderSequenceDecorator creates a new IncrementSenderSequenceDecorator.
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func NewIncrementSenderSequenceDecorator(ak auth.AccountKeeper) IncrementSenderSequenceDecorator {
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return IncrementSenderSequenceDecorator{
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ak: ak,
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}
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}
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// AnteHandle handles incrementing the sequence of the sender.
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func (issd IncrementSenderSequenceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
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2020-05-04 22:41:17 +00:00
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// get and set account must be called with an infinite gas meter in order to prevent
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// additional gas from being deducted.
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gasMeter := ctx.GasMeter()
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ctx = ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
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2020-04-17 22:32:01 +00:00
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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2020-05-04 22:41:17 +00:00
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ctx = ctx.WithGasMeter(gasMeter)
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2020-04-17 22:32:01 +00:00
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// increment sequence of all signers
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for _, addr := range msgEthTx.GetSigners() {
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2020-05-04 22:41:17 +00:00
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acc := issd.ak.GetAccount(ctx, addr)
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2020-04-17 22:32:01 +00:00
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if err := acc.SetSequence(acc.GetSequence() + 1); err != nil {
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panic(err)
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}
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2020-05-04 22:41:17 +00:00
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issd.ak.SetAccount(ctx, acc)
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2020-04-17 22:32:01 +00:00
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}
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2020-05-04 22:41:17 +00:00
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// set the original gas meter
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ctx = ctx.WithGasMeter(gasMeter)
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2020-04-17 22:32:01 +00:00
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return next(ctx, tx, simulate)
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}
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