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fees.go
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fees.go
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// Copyright 2022 Hekas Foundation
// This file is part of the Hekas Network packages.
//
// Hekas 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 Hekas packages are 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 Hekas packages. If not, see https://github.com/hekas-network/hekas/blob/main/LICENSE
package evm
import (
"math/big"
errorsmod "cosmossdk.io/errors"
sdk "github.com/cosmos/cosmos-sdk/types"
errortypes "github.com/cosmos/cosmos-sdk/types/errors"
ethtypes "github.com/ethereum/go-ethereum/core/types"
evmtypes "github.com/hekas-network/hekas/x/evm/types"
)
// EthMinGasPriceDecorator will check if the transaction's fee is at least as large
// as the MinGasPrices param. If fee is too low, decorator returns error and tx
// is rejected. This applies to both CheckTx and DeliverTx and regardless
// if London hard fork or fee market params (EIP-1559) are enabled.
// If fee is high enough, then call next AnteHandler
type EthMinGasPriceDecorator struct {
feesKeeper FeeMarketKeeper
evmKeeper EVMKeeper
}
// EthMempoolFeeDecorator will check if the transaction's effective fee is at least as large
// as the local validator's minimum gasFee (defined in validator config).
// If fee is too low, decorator returns error and tx is rejected from mempool.
// Note this only applies when ctx.CheckTx = true
// If fee is high enough or not CheckTx, then call next AnteHandler
// CONTRACT: Tx must implement FeeTx to use MempoolFeeDecorator
type EthMempoolFeeDecorator struct {
evmKeeper EVMKeeper
}
// NewEthMinGasPriceDecorator creates a new MinGasPriceDecorator instance used only for
// Ethereum transactions.
func NewEthMinGasPriceDecorator(fk FeeMarketKeeper, ek EVMKeeper) EthMinGasPriceDecorator {
return EthMinGasPriceDecorator{feesKeeper: fk, evmKeeper: ek}
}
// NewEthMempoolFeeDecorator creates a new NewEthMempoolFeeDecorator instance used only for
// Ethereum transactions.
func NewEthMempoolFeeDecorator(ek EVMKeeper) EthMempoolFeeDecorator {
return EthMempoolFeeDecorator{
evmKeeper: ek,
}
}
// AnteHandle ensures that the effective fee from the transaction is greater than the
// minimum global fee, which is defined by the MinGasPrice (parameter) * GasLimit (tx argument).
func (empd EthMinGasPriceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
minGasPrice := empd.feesKeeper.GetParams(ctx).MinGasPrice
// short-circuit if min gas price is 0
if minGasPrice.IsZero() {
return next(ctx, tx, simulate)
}
evmParams := empd.evmKeeper.GetParams(ctx)
chainCfg := evmParams.GetChainConfig()
ethCfg := chainCfg.EthereumConfig(empd.evmKeeper.ChainID())
baseFee := empd.evmKeeper.GetBaseFee(ctx, ethCfg)
for _, msg := range tx.GetMsgs() {
ethMsg, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, errorsmod.Wrapf(
errortypes.ErrUnknownRequest,
"invalid message type %T, expected %T",
msg, (*evmtypes.MsgEthereumTx)(nil),
)
}
feeAmt := ethMsg.GetFee()
// For dynamic transactions, GetFee() uses the GasFeeCap value, which
// is the maximum gas price that the signer can pay. In practice, the
// signer can pay less, if the block's BaseFee is lower. So, in this case,
// we use the EffectiveFee. If the feemarket formula results in a BaseFee
// that lowers EffectivePrice until it is < MinGasPrices, the users must
// increase the GasTipCap (priority fee) until EffectivePrice > MinGasPrices.
// Transactions with MinGasPrices * gasUsed < tx fees < EffectiveFee are rejected
// by the feemarket AnteHandle
txData, err := evmtypes.UnpackTxData(ethMsg.Data)
if err != nil {
return ctx, errorsmod.Wrapf(err, "failed to unpack tx data %s", ethMsg.Hash)
}
if txData.TxType() != ethtypes.LegacyTxType {
feeAmt = ethMsg.GetEffectiveFee(baseFee)
}
gasLimit := sdk.NewDecFromBigInt(new(big.Int).SetUint64(ethMsg.GetGas()))
requiredFee := minGasPrice.Mul(gasLimit)
fee := sdk.NewDecFromBigInt(feeAmt)
if fee.LT(requiredFee) {
return ctx, errorsmod.Wrapf(
errortypes.ErrInsufficientFee,
"provided fee < minimum global fee (%d < %d). Please increase the priority tip (for EIP-1559 txs) or the gas prices (for access list or legacy txs)", //nolint:lll
fee.TruncateInt().Int64(), requiredFee.TruncateInt().Int64(),
)
}
}
return next(ctx, tx, simulate)
}
// AnteHandle ensures that the provided fees meet a minimum threshold for the validator.
// This check only for local mempool purposes, and thus it is only run on (Re)CheckTx.
// The logic is also skipped if the London hard fork and EIP-1559 are enabled.
func (mfd EthMempoolFeeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
if !ctx.IsCheckTx() || simulate {
return next(ctx, tx, simulate)
}
evmParams := mfd.evmKeeper.GetParams(ctx)
chainCfg := evmParams.GetChainConfig()
ethCfg := chainCfg.EthereumConfig(mfd.evmKeeper.ChainID())
baseFee := mfd.evmKeeper.GetBaseFee(ctx, ethCfg)
// skip check as the London hard fork and EIP-1559 are enabled
if baseFee != nil {
return next(ctx, tx, simulate)
}
evmDenom := evmParams.GetEvmDenom()
minGasPrice := ctx.MinGasPrices().AmountOf(evmDenom)
for _, msg := range tx.GetMsgs() {
ethMsg, ok := msg.(*evmtypes.MsgEthereumTx)
if !ok {
return ctx, errorsmod.Wrapf(errortypes.ErrUnknownRequest, "invalid message type %T, expected %T", msg, (*evmtypes.MsgEthereumTx)(nil))
}
fee := sdk.NewDecFromBigInt(ethMsg.GetFee())
gasLimit := sdk.NewDecFromBigInt(new(big.Int).SetUint64(ethMsg.GetGas()))
requiredFee := minGasPrice.Mul(gasLimit)
if fee.LT(requiredFee) {
return ctx, errorsmod.Wrapf(
errortypes.ErrInsufficientFee,
"insufficient fee; got: %s required: %s",
fee, requiredFee,
)
}
}
return next(ctx, tx, simulate)
}