laconicd/x/evm/keeper/utils.go

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package keeper
import (
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
"github.com/palantir/stacktrace"
evmtypes "github.com/tharsis/ethermint/x/evm/types"
"github.com/ethereum/go-ethereum/core"
ethtypes "github.com/ethereum/go-ethereum/core/types"
)
// AccountKeeper defines an expected keeper interface for the auth module's AccountKeeper
// DeductTxCostsFromUserBalance it calculates the tx costs and deducts the fees
func DeductTxCostsFromUserBalance(
ctx sdk.Context,
bankKeeper evmtypes.BankKeeper,
accountKeeper evmtypes.AccountKeeper,
msgEthTx evmtypes.MsgEthereumTx,
txData evmtypes.TxData,
denom string,
homestead bool,
istanbul bool,
) (sdk.Coins, error) {
isContractCreation := txData.GetTo() == nil
// fetch sender account from signature
signerAcc, err := authante.GetSignerAcc(ctx, accountKeeper, msgEthTx.GetFrom())
if err != nil {
return nil, stacktrace.Propagate(err, "account not found for sender %s", msgEthTx.From)
}
gasLimit := txData.GetGas()
var accessList ethtypes.AccessList
if txData.GetAccessList() != nil {
accessList = txData.GetAccessList()
}
intrinsicGas, err := core.IntrinsicGas(txData.GetData(), accessList, isContractCreation, homestead, istanbul)
if err != nil {
return nil, stacktrace.Propagate(sdkerrors.Wrap(
err,
"failed to compute intrinsic gas cost"), "failed to retrieve intrinsic gas, contract creation = %t; homestead = %t, istanbul = %t",
isContractCreation, homestead, istanbul,
)
}
// intrinsic gas verification during CheckTx
if ctx.IsCheckTx() && gasLimit < intrinsicGas {
return nil, sdkerrors.Wrapf(
sdkerrors.ErrOutOfGas,
"gas limit too low: %d (gas limit) < %d (intrinsic gas)", gasLimit, intrinsicGas,
)
}
// calculate the fees paid to validators based on gas limit and price
feeAmt := txData.Fee() // fee = gas limit * gas price
fees := sdk.Coins{sdk.NewCoin(denom, sdk.NewIntFromBigInt(feeAmt))}
// deduct the full gas cost from the user balance
if err := authante.DeductFees(bankKeeper, ctx, signerAcc, fees); err != nil {
return nil, stacktrace.Propagate(
err,
"failed to deduct full gas cost %s from the user %s balance",
fees, msgEthTx.From,
)
}
return fees, nil
}
// CheckSenderBalance validates sender has enough funds to pay for tx cost
func CheckSenderBalance(
ctx sdk.Context,
bankKeeper evmtypes.BankKeeper,
sender sdk.AccAddress,
txData evmtypes.TxData,
denom string,
) error {
balance := bankKeeper.GetBalance(ctx, sender, denom)
cost := txData.Cost()
if balance.Amount.BigInt().Cmp(cost) < 0 {
return stacktrace.Propagate(
sdkerrors.Wrapf(
sdkerrors.ErrInsufficientFunds,
"sender balance < tx cost (%s < %s%s)", balance, txData.Cost(), denom,
),
"sender should have had enough funds to pay for tx cost = fee + amount (%s = %s + %s)",
cost, txData.Fee(), txData.GetValue(),
)
}
return nil
}