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ante.go
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ante.go
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package app
import (
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/cosmos/cosmos-sdk/x/auth/signing"
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
ante "github.com/cosmos/cosmos-sdk/x/auth/ante"
channelkeeper "github.com/cosmos/cosmos-sdk/x/ibc/core/04-channel/keeper"
ibcante "github.com/cosmos/cosmos-sdk/x/ibc/core/ante"
)
// Link to default ante handler used by cosmos sdk:
// https://github.com/cosmos/cosmos-sdk/blob/v0.43.0/x/auth/ante/ante.go#L41
func NewAnteHandler(
ak ante.AccountKeeper, bankKeeper authtypes.BankKeeper,
sigGasConsumer ante.SignatureVerificationGasConsumer,
signModeHandler signing.SignModeHandler,
channelKeeper channelkeeper.Keeper,
) sdk.AnteHandler {
return sdk.ChainAnteDecorators(
ante.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first
ante.NewRejectExtensionOptionsDecorator(),
NewMempoolFeeDecorator(),
ante.NewValidateBasicDecorator(),
ante.TxTimeoutHeightDecorator{},
ante.NewValidateMemoDecorator(ak),
ante.NewConsumeGasForTxSizeDecorator(ak),
ante.NewRejectFeeGranterDecorator(),
ante.NewSetPubKeyDecorator(ak), // SetPubKeyDecorator must be called before all signature verification decorators
ante.NewValidateSigCountDecorator(ak),
ante.NewDeductFeeDecorator(ak, bankKeeper),
ante.NewSigGasConsumeDecorator(ak, sigGasConsumer),
ante.NewSigVerificationDecorator(ak, signModeHandler),
ante.NewIncrementSequenceDecorator(ak),
ibcante.NewAnteDecorator(channelKeeper),
)
}
// MempoolFeeDecorator will check if the transaction's 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 MempoolFeeDecorator struct{}
func NewMempoolFeeDecorator() MempoolFeeDecorator {
return MempoolFeeDecorator{}
}
func (mfd MempoolFeeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
feeTx, ok := tx.(sdk.FeeTx)
if !ok {
return ctx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "Tx must be a FeeTx")
}
feeCoins := feeTx.GetFee()
gas := feeTx.GetGas()
// Ensure that the provided fees meet a minimum threshold for the validator,
// if this is a CheckTx. This is only for local mempool purposes, and thus
// is only ran on check tx.
if ctx.IsCheckTx() && !simulate {
// Ensure that maximum of 25M gas per tx is used, no greater
if gas > 25000000 {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrOutOfGas, "Too much gas wanted: %d, maximum is 25,000,000", gas)
}
minGasPrices := ctx.MinGasPrices()
if !minGasPrices.IsZero() {
requiredFees := make(sdk.Coins, len(minGasPrices))
// Determine the required fees by multiplying each required minimum gas
// price by the gas limit, where fee = ceil(minGasPrice * gasLimit).
glDec := sdk.NewDec(int64(gas))
for i, gp := range minGasPrices {
fee := gp.Amount.Mul(glDec)
requiredFees[i] = sdk.NewCoin(gp.Denom, fee.Ceil().RoundInt())
}
if !feeCoins.IsAnyGTE(requiredFees) {
return ctx, sdkerrors.Wrapf(sdkerrors.ErrInsufficientFee, "insufficient fees; got: %s required: %s", feeCoins, requiredFees)
}
}
}
return next(ctx, tx, simulate)
}