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ante.go
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ante.go
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package ante
import (
sdk "github.com/cosmos/cosmos-sdk/types"
clienttypes "github.com/cosmos/ibc-go/v3/modules/core/02-client/types"
channeltypes "github.com/cosmos/ibc-go/v3/modules/core/04-channel/types"
"github.com/cosmos/ibc-go/v3/modules/core/keeper"
)
type AnteDecorator struct {
k *keeper.Keeper
}
func NewAnteDecorator(k *keeper.Keeper) AnteDecorator {
return AnteDecorator{k: k}
}
// AnteDecorator returns an error if a multiMsg tx only contains packet messages (Recv, Ack, Timeout) and additional update messages
// and all packet messages are redundant. If the transaction is just a single UpdateClient message, or the multimsg transaction
// contains some other message type, then the antedecorator returns no error and continues processing to ensure these transactions
// are included. This will ensure that relayers do not waste fees on multiMsg transactions when another relayer has already submitted
// all packets, by rejecting the tx at the mempool layer.
func (ad AnteDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
// do not run redundancy check on DeliverTx or simulate
if (ctx.IsCheckTx() || ctx.IsReCheckTx()) && !simulate {
// keep track of total packet messages and number of redundancies across `RecvPacket`, `AcknowledgePacket`, and `TimeoutPacket/OnClose`
redundancies := 0
packetMsgs := 0
for _, m := range tx.GetMsgs() {
switch msg := m.(type) {
case *channeltypes.MsgRecvPacket:
response, err := ad.k.RecvPacket(sdk.WrapSDKContext(ctx), msg)
if err != nil {
return ctx, err
}
if response.Result == channeltypes.NOOP {
redundancies += 1
}
packetMsgs += 1
case *channeltypes.MsgAcknowledgement:
response, err := ad.k.Acknowledgement(sdk.WrapSDKContext(ctx), msg)
if err != nil {
return ctx, err
}
if response.Result == channeltypes.NOOP {
redundancies += 1
}
packetMsgs += 1
case *channeltypes.MsgTimeout:
response, err := ad.k.Timeout(sdk.WrapSDKContext(ctx), msg)
if err != nil {
return ctx, err
}
if response.Result == channeltypes.NOOP {
redundancies += 1
}
packetMsgs += 1
case *channeltypes.MsgTimeoutOnClose:
response, err := ad.k.TimeoutOnClose(sdk.WrapSDKContext(ctx), msg)
if err != nil {
return ctx, err
}
if response.Result == channeltypes.NOOP {
redundancies += 1
}
packetMsgs += 1
case *clienttypes.MsgUpdateClient:
_, err := ad.k.UpdateClient(sdk.WrapSDKContext(ctx), msg)
if err != nil {
return ctx, err
}
default:
// if the multiMsg tx has a msg that is not a packet msg or update msg, then we will not return error
// regardless of if all packet messages are redundant. This ensures that non-packet messages get processed
// even if they get batched with redundant packet messages.
return next(ctx, tx, simulate)
}
}
// only return error if all packet messages are redundant
if redundancies == packetMsgs && packetMsgs > 0 {
return ctx, channeltypes.ErrRedundantTx
}
}
return next(ctx, tx, simulate)
}