105 lines
3.1 KiB
Go
105 lines
3.1 KiB
Go
package keeper
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import (
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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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authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
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"github.com/palantir/stacktrace"
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evmtypes "github.com/tharsis/ethermint/x/evm/types"
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"github.com/ethereum/go-ethereum/core"
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ethtypes "github.com/ethereum/go-ethereum/core/types"
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)
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// DeductTxCostsFromUserBalance it calculates the tx costs and deducts the fees
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func (k Keeper) DeductTxCostsFromUserBalance(
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ctx sdk.Context,
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msgEthTx evmtypes.MsgEthereumTx,
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txData evmtypes.TxData,
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denom string,
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homestead bool,
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istanbul bool,
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) (sdk.Coins, error) {
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isContractCreation := txData.GetTo() == nil
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// fetch sender account from signature
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signerAcc, err := authante.GetSignerAcc(ctx, k.accountKeeper, msgEthTx.GetFrom())
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if err != nil {
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return nil, stacktrace.Propagate(err, "account not found for sender %s", msgEthTx.From)
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}
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gasLimit := txData.GetGas()
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var accessList ethtypes.AccessList
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if txData.GetAccessList() != nil {
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accessList = txData.GetAccessList()
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}
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intrinsicGas, err := core.IntrinsicGas(txData.GetData(), accessList, isContractCreation, homestead, istanbul)
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if err != nil {
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return nil, stacktrace.Propagate(sdkerrors.Wrap(
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err,
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"failed to compute intrinsic gas cost"), "failed to retrieve intrinsic gas, contract creation = %t; homestead = %t, istanbul = %t",
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isContractCreation, homestead, istanbul,
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)
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}
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// intrinsic gas verification during CheckTx
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if ctx.IsCheckTx() && gasLimit < intrinsicGas {
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return nil, sdkerrors.Wrapf(
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sdkerrors.ErrOutOfGas,
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"gas limit too low: %d (gas limit) < %d (intrinsic gas)", gasLimit, intrinsicGas,
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)
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}
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// calculate the fees paid to validators based on gas limit and price
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feeAmt := txData.Fee() // fee = gas limit * gas price
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fees := sdk.Coins{sdk.NewCoin(denom, sdk.NewIntFromBigInt(feeAmt))}
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// deduct the full gas cost from the user balance
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if err := authante.DeductFees(k.bankKeeper, ctx, signerAcc, fees); err != nil {
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return nil, stacktrace.Propagate(
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err,
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"failed to deduct full gas cost %s from the user %s balance",
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fees, msgEthTx.From,
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)
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}
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return fees, nil
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}
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// CheckSenderBalance validates that the tx cost value is positive and that the
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// sender has enough funds to pay for the fees and value of the transaction.
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func CheckSenderBalance(
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ctx sdk.Context,
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bankKeeper evmtypes.BankKeeper,
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sender sdk.AccAddress,
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txData evmtypes.TxData,
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denom string,
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) error {
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balance := bankKeeper.GetBalance(ctx, sender, denom)
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cost := txData.Cost()
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if cost.Sign() < 0 {
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return stacktrace.Propagate(
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sdkerrors.Wrapf(
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sdkerrors.ErrInvalidCoins,
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"tx cost (%s%s) is negative and invalid", cost, denom,
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),
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"tx cost amount should never be negative")
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}
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if balance.IsNegative() || balance.Amount.BigInt().Cmp(cost) < 0 {
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return stacktrace.Propagate(
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sdkerrors.Wrapf(
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sdkerrors.ErrInsufficientFunds,
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"sender balance < tx cost (%s < %s%s)", balance, txData.Cost(), denom,
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),
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"sender should have had enough funds to pay for tx cost = fee + amount (%s = %s + %s)",
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cost, txData.Fee(), txData.GetValue(),
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)
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}
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return nil
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}
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