91 lines
3.8 KiB
Go
91 lines
3.8 KiB
Go
// Copyright 2021 Evmos Foundation
|
|
// This file is part of Evmos' Ethermint library.
|
|
//
|
|
// The Ethermint library 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 Ethermint library is 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 Ethermint library. If not, see https://github.com/evmos/ethermint/blob/main/LICENSE
|
|
package keeper
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/core"
|
|
"github.com/ethereum/go-ethereum/params"
|
|
|
|
errorsmod "cosmossdk.io/errors"
|
|
sdkmath "cosmossdk.io/math"
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
errortypes "github.com/cosmos/cosmos-sdk/types/errors"
|
|
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
|
|
|
|
"github.com/cerc-io/laconicd/x/evm/types"
|
|
)
|
|
|
|
// GetEthIntrinsicGas returns the intrinsic gas cost for the transaction
|
|
func (k *Keeper) GetEthIntrinsicGas(ctx sdk.Context, msg core.Message, cfg *params.ChainConfig, isContractCreation bool) (uint64, error) {
|
|
height := big.NewInt(ctx.BlockHeight())
|
|
homestead := cfg.IsHomestead(height)
|
|
istanbul := cfg.IsIstanbul(height)
|
|
|
|
return core.IntrinsicGas(msg.Data(), msg.AccessList(), isContractCreation, homestead, istanbul)
|
|
}
|
|
|
|
// RefundGas transfers the leftover gas to the sender of the message, caped to half of the total gas
|
|
// consumed in the transaction. Additionally, the function sets the total gas consumed to the value
|
|
// returned by the EVM execution, thus ignoring the previous intrinsic gas consumed during in the
|
|
// AnteHandler.
|
|
func (k *Keeper) RefundGas(ctx sdk.Context, msg core.Message, leftoverGas uint64, denom string) error {
|
|
// Return EVM tokens for remaining gas, exchanged at the original rate.
|
|
remaining := new(big.Int).Mul(new(big.Int).SetUint64(leftoverGas), msg.GasPrice())
|
|
|
|
switch remaining.Sign() {
|
|
case -1:
|
|
// negative refund errors
|
|
return errorsmod.Wrapf(types.ErrInvalidRefund, "refunded amount value cannot be negative %d", remaining.Int64())
|
|
case 1:
|
|
// positive amount refund
|
|
refundedCoins := sdk.Coins{sdk.NewCoin(denom, sdkmath.NewIntFromBigInt(remaining))}
|
|
|
|
// refund to sender from the fee collector module account, which is the escrow account in charge of collecting tx fees
|
|
|
|
err := k.bankKeeper.SendCoinsFromModuleToAccount(ctx, authtypes.FeeCollectorName, msg.From().Bytes(), refundedCoins)
|
|
if err != nil {
|
|
err = errorsmod.Wrapf(errortypes.ErrInsufficientFunds, "fee collector account failed to refund fees: %s", err.Error())
|
|
return errorsmod.Wrapf(err, "failed to refund %d leftover gas (%s)", leftoverGas, refundedCoins.String())
|
|
}
|
|
default:
|
|
// no refund, consume gas and update the tx gas meter
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// ResetGasMeterAndConsumeGas reset first the gas meter consumed value to zero and set it back to the new value
|
|
// 'gasUsed'
|
|
func (k *Keeper) ResetGasMeterAndConsumeGas(ctx sdk.Context, gasUsed uint64) {
|
|
// reset the gas count
|
|
ctx.GasMeter().RefundGas(ctx.GasMeter().GasConsumed(), "reset the gas count")
|
|
ctx.GasMeter().ConsumeGas(gasUsed, "apply evm transaction")
|
|
}
|
|
|
|
// GasToRefund calculates the amount of gas the state machine should refund to the sender. It is
|
|
// capped by the refund quotient value.
|
|
// Note: do not pass 0 to refundQuotient
|
|
func GasToRefund(availableRefund, gasConsumed, refundQuotient uint64) uint64 {
|
|
// Apply refund counter
|
|
refund := gasConsumed / refundQuotient
|
|
if refund > availableRefund {
|
|
return availableRefund
|
|
}
|
|
return refund
|
|
}
|