142 lines
4.7 KiB
Go
142 lines
4.7 KiB
Go
package ante
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import (
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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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ethtypes "github.com/ethereum/go-ethereum/core/types"
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evmtypes "github.com/tharsis/ethermint/x/evm/types"
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)
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// MinGasPriceDecorator will check if the transaction's fee is at least as large
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// as the MinGasPrices param. If fee is too low, decorator returns error and tx
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// is rejected. This applies for both CheckTx and DeliverTx
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// If fee is high enough, then call next AnteHandler
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// CONTRACT: Tx must implement FeeTx to use MinGasPriceDecorator
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type MinGasPriceDecorator struct {
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feesKeeper FeeMarketKeeper
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evmKeeper EVMKeeper
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}
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func NewMinGasPriceDecorator(fk FeeMarketKeeper, ek EVMKeeper) MinGasPriceDecorator {
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return MinGasPriceDecorator{feesKeeper: fk, evmKeeper: ek}
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}
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func (mpd MinGasPriceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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feeTx, ok := tx.(sdk.FeeTx)
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if !ok {
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return ctx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "Tx must be a FeeTx")
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}
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minGasPrice := mpd.feesKeeper.GetParams(ctx).MinGasPrice
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// short-circuit if min gas price is 0
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if minGasPrice.IsZero() {
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return next(ctx, tx, simulate)
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}
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evmParams := mpd.evmKeeper.GetParams(ctx)
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minGasPrices := sdk.DecCoins{
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{
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Denom: evmParams.EvmDenom,
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Amount: minGasPrice,
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},
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}
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feeCoins := feeTx.GetFee()
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gas := feeTx.GetGas()
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requiredFees := make(sdk.Coins, 0)
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// Determine the required fees by multiplying each required minimum gas
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// price by the gas limit, where fee = ceil(minGasPrice * gasLimit).
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gasLimit := sdk.NewDecFromBigInt(new(big.Int).SetUint64(gas))
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for _, gp := range minGasPrices {
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fee := gp.Amount.Mul(gasLimit).Ceil().RoundInt()
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if fee.IsPositive() {
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requiredFees = requiredFees.Add(sdk.Coin{Denom: gp.Denom, Amount: fee})
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}
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}
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if !feeCoins.IsAnyGTE(requiredFees) {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrInsufficientFee, "provided fee < minimum global fee (%s < %s). Please increase the gas price.", feeCoins, requiredFees)
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}
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return next(ctx, tx, simulate)
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}
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// EthMinGasPriceDecorator will check if the transaction's fee is at least as large
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// as the MinGasPrices param. If fee is too low, decorator returns error and tx
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// is rejected. This applies to both CheckTx and DeliverTx and regardless
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// if London hard fork or fee market params (EIP-1559) are enabled.
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// If fee is high enough, then call next AnteHandler
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type EthMinGasPriceDecorator struct {
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feesKeeper FeeMarketKeeper
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evmKeeper EVMKeeper
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}
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func NewEthMinGasPriceDecorator(fk FeeMarketKeeper, ek EVMKeeper) EthMinGasPriceDecorator {
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return EthMinGasPriceDecorator{feesKeeper: fk, evmKeeper: ek}
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}
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func (empd EthMinGasPriceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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minGasPrice := empd.feesKeeper.GetParams(ctx).MinGasPrice
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// short-circuit if min gas price is 0
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if minGasPrice.IsZero() {
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return next(ctx, tx, simulate)
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}
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paramsEvm := empd.evmKeeper.GetParams(ctx)
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ethCfg := paramsEvm.ChainConfig.EthereumConfig(empd.evmKeeper.ChainID())
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baseFee := empd.evmKeeper.GetBaseFee(ctx, ethCfg)
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for _, msg := range tx.GetMsgs() {
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ethMsg, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrUnknownRequest,
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"invalid message type %T, expected %T",
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msg, (*evmtypes.MsgEthereumTx)(nil),
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)
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}
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feeAmt := ethMsg.GetFee()
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// For dynamic transactions, GetFee() uses the GasFeeCap value, which
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// is the maximum gas price that the signer can pay. In practice, the
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// signer can pay less, if the block's BaseFee is lower. So, in this case,
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// we use the EffectiveFee. If the feemarket formula results in a BaseFee
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// that lowers EffectivePrice until it is < MinGasPrices, the users must
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// increase the GasTipCap (priority fee) until EffectivePrice > MinGasPrices.
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// Transactions with MinGasPrices * gasUsed < tx fees < EffectiveFee are rejected
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// by the feemarket AnteHandle
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txData, err := evmtypes.UnpackTxData(ethMsg.Data)
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if err != nil {
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return ctx, sdkerrors.Wrapf(err, "failed to unpack tx data %s", ethMsg.Hash)
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}
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if txData.TxType() != ethtypes.LegacyTxType {
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feeAmt = ethMsg.GetEffectiveFee(baseFee)
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}
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gasLimit := sdk.NewDecFromBigInt(new(big.Int).SetUint64(ethMsg.GetGas()))
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requiredFee := minGasPrice.Mul(gasLimit)
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fee := sdk.NewDecFromBigInt(feeAmt)
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if fee.LT(requiredFee) {
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrInsufficientFee,
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"provided fee < minimum global fee (%s < %s). Please increase the priority tip (for EIP-1559 txs) or the gas prices (for access list or legacy txs)",
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fee, requiredFee,
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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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