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fees.go
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fees.go
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// Copyright 2022 Evmos Foundation
// This file is part of the Evmos Network packages.
//
// Evmos 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 Evmos 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 Evmos packages. If not, see https://github.com/evmos/evmos/blob/main/LICENSE
package keeper
import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
ethtypes "github.com/ethereum/go-ethereum/core/types"
errorsmod "cosmossdk.io/errors"
sdkmath "cosmossdk.io/math"
sdk "github.com/cosmos/cosmos-sdk/types"
errortypes "github.com/cosmos/cosmos-sdk/types/errors"
authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
"github.com/settlus/chain/evmos/x/evm/types"
)
// CheckSenderBalance validates that the tx cost value is positive and that the
// sender has enough funds to pay for the fees and value of the transaction.
func CheckSenderBalance(
balance sdkmath.Int,
txData types.TxData,
) error {
cost := txData.Cost()
if cost.Sign() < 0 {
return errorsmod.Wrapf(
errortypes.ErrInvalidCoins,
"tx cost (%s) is negative and invalid", cost,
)
}
if balance.IsNegative() || balance.BigInt().Cmp(cost) < 0 {
return errorsmod.Wrapf(
errortypes.ErrInsufficientFunds,
"sender balance < tx cost (%s < %s)", balance, txData.Cost(),
)
}
return nil
}
// DeductTxCostsFromUserBalance deducts the fees from the user balance. Returns an
// error if the specified sender address does not exist or the account balance is not sufficient.
func (k *Keeper) DeductTxCostsFromUserBalance(
ctx sdk.Context,
fees sdk.Coins,
from common.Address,
) error {
// fetch sender account
signerAcc, err := authante.GetSignerAcc(ctx, k.accountKeeper, from.Bytes())
if err != nil {
return errorsmod.Wrapf(err, "account not found for sender %s", from)
}
// deduct the full gas cost from the user balance
if err := authante.DeductFees(k.bankKeeper, ctx, signerAcc, fees); err != nil {
return errorsmod.Wrapf(err, "failed to deduct full gas cost %s from the user %s balance", fees, from)
}
return nil
}
// VerifyFee is used to return the fee for the given transaction data in sdk.Coins. It checks that the
// gas limit is not reached, the gas limit is higher than the intrinsic gas and that the
// base fee is higher than the gas fee cap.
func VerifyFee(
txData types.TxData,
denom string,
baseFee *big.Int,
homestead, istanbul, sanghai, isCheckTx bool,
) (sdk.Coins, error) {
isContractCreation := txData.GetTo() == nil
gasLimit := txData.GetGas()
var accessList ethtypes.AccessList
if txData.GetAccessList() != nil {
accessList = txData.GetAccessList()
}
intrinsicGas, err := core.IntrinsicGas(txData.GetData(), accessList, isContractCreation, homestead, istanbul, sanghai)
if err != nil {
return nil, errorsmod.Wrapf(
err,
"failed to retrieve intrinsic gas, contract creation = %t; homestead = %t, istanbul = %t",
isContractCreation, homestead, istanbul,
)
}
// intrinsic gas verification during CheckTx
if isCheckTx && gasLimit < intrinsicGas {
return nil, errorsmod.Wrapf(
errortypes.ErrOutOfGas,
"gas limit too low: %d (gas limit) < %d (intrinsic gas)", gasLimit, intrinsicGas,
)
}
if baseFee != nil && txData.GetGasFeeCap().Cmp(baseFee) < 0 {
return nil, errorsmod.Wrapf(errortypes.ErrInsufficientFee,
"the tx gasfeecap is lower than the tx baseFee: %s (gasfeecap), %s (basefee) ",
txData.GetGasFeeCap(),
baseFee)
}
feeAmt := txData.EffectiveFee(baseFee)
if feeAmt.Sign() == 0 {
// zero fee, no need to deduct
return sdk.Coins{}, nil
}
return sdk.Coins{{Denom: denom, Amount: sdkmath.NewIntFromBigInt(feeAmt)}}, nil
}