gpush

x/rollapp/keeper/transfer_genesis.go

@@ -18,7 +18,7 @@ func (k Keeper) VerifyAndRecordGenesisTransfer(ctx sdk.Context, rollappID string
 	if ra.GenesisState.TransfersEnabled {
 		// Could plausibly occur if a chain sends too many genesis transfers (not matching their memo)
 		// or if a chain which registered with the bridge enabled tries to send some genesis transfers
-		return 0, errorsmod.Wrap(dymerror.ErrFraud, "received genesis transfer but transfers are already enabled")
+		return 0, errorsmod.Wrap(dymerror.ErrFraud, "received genesis transfer but all bridge transfers are already enabled")
 	}
 
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), types.KeyPrefix(types.TransferGenesisMapKeyPrefix))

x/rollapp/transfergenesis/ibc_middleware.go

@@ -169,7 +169,12 @@ func (w IBCMiddleware) OnRecvPacket(
 
 	nTransfersDone, err := w.rollappKeeper.VerifyAndRecordGenesisTransfer(ctx, ra.RollappId, m.ThisTransferIx, m.TotalNumTransfers)
 	if errorsmod.IsOf(err, dymerror.ErrFraud) {
-		// TODO: emit event or freeze rollapp, or something else?
+		l.Info("rollapp fraud: verify and record genesis transfer", "err", err)
+		// The rollapp has deviated from the protocol!
+		err = w.handleFraud(ra.RollappId)
+		if err != nil {
+			l.Error("handle fraud", "error", err)
+		}
 	}
 	if err != nil {
 		l.Error("verify and record transfer", "error", err)
@@ -202,6 +207,14 @@ func (w IBCMiddleware) OnRecvPacket(
 	return w.Middleware.OnRecvPacket(delayedacktypes.SkipContext(ctx), packet, relayer)
 }
 
+func (w IBCMiddleware) handleFraud(raID string) error {
+	// TODO: assumes we have a robust mechanism to freeze and rollback
+	// 		 NOTE: this may not be a fraud in the sense that the sequencer posted the wrong state root
+	//             it might be that the canonical state transition function for the RA is wrong somehow
+	//             and resulted in a protocol breakage
+	return nil
+}
+
 func allTransfersReceivedEvent(raID string, nReceived uint64) sdk.Event {
 	return sdk.NewEvent(types.EventTypeTransferGenesisAllReceived,
 		sdk.NewAttribute(types.AttributeKeyRollappId, raID),