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fee_route.go
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fee_route.go
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package ante
import (
errorsmod "cosmossdk.io/errors"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
feepayhelpers "github.com/CosmosContracts/juno/v19/x/feepay/helpers"
feepaykeeper "github.com/CosmosContracts/juno/v19/x/feepay/keeper"
globalfeeante "github.com/CosmosContracts/juno/v19/x/globalfee/ante"
)
// MsgFilterDecorator defines an AnteHandler decorator that only checks and saves if a
type MsgIsFeePayTx struct {
feePayKeeper feepaykeeper.Keeper
feePayDecorator *DeductFeeDecorator
globalFeeDecorator *globalfeeante.FeeDecorator
isFeePayTx *bool
}
func NewFeeRouteDecorator(feePayKeeper feepaykeeper.Keeper, feePayDecorator *DeductFeeDecorator, globalFeeDecorator *globalfeeante.FeeDecorator, isFeePayTx *bool) MsgIsFeePayTx {
return MsgIsFeePayTx{
feePayKeeper: feePayKeeper,
feePayDecorator: feePayDecorator,
globalFeeDecorator: globalFeeDecorator,
isFeePayTx: isFeePayTx,
}
}
// This empty ante is used to call AnteHandles that are not attached
// to the main AnteHandler.
var (
EmptyAnte = func(ctx sdk.Context, tx sdk.Tx, simulate bool) (sdk.Context, error) {
return ctx, nil
}
)
// This handle is responsible for routing the transaction to the fee decorators
// in the right order.
func (mfd MsgIsFeePayTx) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
// Check if a fee tx
feeTx, ok := tx.(sdk.FeeTx)
if !ok {
return ctx, errorsmod.Wrap(sdkerrors.ErrTxDecode, "Tx must be a FeeTx")
}
// Flag a transaction as a fee pay transaction
*mfd.isFeePayTx = feepayhelpers.IsValidFeePayTransaction(ctx, mfd.feePayKeeper, feeTx)
// If a FeePayTx, call FeePay decorator then global fee decorator.
// Otherwise, call global fee decorator then FeePay decorator.
//
// This logic is necessary in the case the FeePay decorator fails,
// the global fee decorator will still be called to handle fees.
if *mfd.isFeePayTx {
if ctx, err := mfd.feePayDecorator.AnteHandle(ctx, tx, simulate, EmptyAnte); err != nil {
return ctx, err
}
if ctx, err := mfd.globalFeeDecorator.AnteHandle(ctx, tx, simulate, EmptyAnte); err != nil {
return ctx, err
}
} else {
if ctx, err := mfd.globalFeeDecorator.AnteHandle(ctx, tx, simulate, EmptyAnte); err != nil {
return ctx, err
}
if ctx, err := mfd.feePayDecorator.AnteHandle(ctx, tx, simulate, EmptyAnte); err != nil {
return ctx, err
}
}
// Call next handler
return next(ctx, tx, simulate)
}