perf: minimize necessary execution on recvpacket checktx (backport #6302)

CHANGELOG.md

@@ -43,6 +43,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### State Machine Breaking
 
 ### Improvements
+* (core/ante) [\#6302](https://github.com/cosmos/ibc-go/pull/6302) Performance: Skip app callbacks during RecvPacket execution in checkTx within the redundant relay ante handler.
 
 ### Features
 

modules/core/ante/ante.go

@@ -1,6 +1,8 @@
 package ante
 
 import (
+	errorsmod "cosmossdk.io/errors"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
 	clienttypes "github.com/cosmos/ibc-go/v8/modules/core/02-client/types"
@@ -30,10 +32,22 @@ func (rrd RedundantRelayDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simula
 		for _, m := range tx.GetMsgs() {
 			switch msg := m.(type) {
 			case *channeltypes.MsgRecvPacket:
-				response, err := rrd.k.RecvPacket(ctx, msg)
+				var (
+					response *channeltypes.MsgRecvPacketResponse
+					err      error
+				)
+				// when we are in ReCheckTx mode, ctx.IsCheckTx() will also return true
+				// there we must start the if statement on ctx.IsReCheckTx() to correctly
+				// determine which mode we are in
+				if ctx.IsReCheckTx() {
+					response, err = rrd.k.RecvPacket(ctx, msg)
+				} else {
+					response, err = rrd.recvPacketCheckTx(ctx, msg)
+				}
 				if err != nil {
 					return ctx, err
 				}
+
 				if response.Result == channeltypes.NOOP {
 					redundancies++
 				}
@@ -90,3 +104,29 @@ func (rrd RedundantRelayDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simula
 	}
 	return next(ctx, tx, simulate)
 }
+
+// recvPacketCheckTx runs a subset of ibc recv packet logic to be used specifically within the RedundantRelayDecorator AnteHandler.
+// It only performs core IBC receiving logic and skips any application logic.
+func (rrd RedundantRelayDecorator) recvPacketCheckTx(ctx sdk.Context, msg *channeltypes.MsgRecvPacket) (*channeltypes.MsgRecvPacketResponse, error) {
+	// grab channel capability
+	_, capability, err := rrd.k.ChannelKeeper.LookupModuleByChannel(ctx, msg.Packet.DestinationPort, msg.Packet.DestinationChannel)
+	if err != nil {
+		return nil, errorsmod.Wrap(err, "could not retrieve module from port-id")
+	}
+
+	// If the packet was already received, perform a no-op
+	// Use a cached context to prevent accidental state changes
+	cacheCtx, writeFn := ctx.CacheContext()
+	err = rrd.k.ChannelKeeper.RecvPacket(cacheCtx, capability, msg.Packet, msg.ProofCommitment, msg.ProofHeight)
+
+	switch err {
+	case nil:
+		writeFn()
+	case channeltypes.ErrNoOpMsg:
+		return &channeltypes.MsgRecvPacketResponse{Result: channeltypes.NOOP}, nil
+	default:
+		return nil, errorsmod.Wrap(err, "receive packet verification failed")
+	}
+
+	return &channeltypes.MsgRecvPacketResponse{Result: channeltypes.SUCCESS}, nil
+}

modules/core/ante/ante_test.go

@@ -1,6 +1,7 @@
 package ante_test
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -46,7 +47,7 @@ func TestAnteTestSuite(t *testing.T) {
 }
 
 // createRecvPacketMessage creates a RecvPacket message for a packet sent from chain A to chain B.
-func (suite *AnteTestSuite) createRecvPacketMessage(isRedundant bool) sdk.Msg {
+func (suite *AnteTestSuite) createRecvPacketMessage(isRedundant bool) *channeltypes.MsgRecvPacket {
 	sequence, err := suite.path.EndpointA.SendPacket(clienttypes.NewHeight(2, 0), 0, ibctesting.MockPacketData)
 	suite.Require().NoError(err)
 
@@ -342,6 +343,20 @@ func (suite *AnteTestSuite) TestAnteDecorator() {
 			},
 			true,
 		},
+		{
+			"success on app callback error, app callbacks are skipped for performance",
+			func(suite *AnteTestSuite) []sdk.Msg {
+				suite.chainB.GetSimApp().IBCMockModule.IBCApp.OnRecvPacket = func(
+					ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress,
+				) exported.Acknowledgement {
+					panic(fmt.Errorf("failed OnRecvPacket mock callback"))
+				}
+
+				// the RecvPacket message has not been submitted to the chain yet, so it will succeed
+				return []sdk.Msg{suite.createRecvPacketMessage(false)}
+			},
+			true,
+		},
 		{
 			"no success on one redundant RecvPacket message",
 			func(suite *AnteTestSuite) []sdk.Msg {
@@ -451,6 +466,15 @@ func (suite *AnteTestSuite) TestAnteDecorator() {
 			},
 			false,
 		},
+		{
+			"no success on recvPacket checkTx, no capability found",
+			func(suite *AnteTestSuite) []sdk.Msg {
+				msg := suite.createRecvPacketMessage(false)
+				msg.Packet.DestinationPort = "invalid-port"
+				return []sdk.Msg{msg}
+			},
+			false,
+		},
 	}
 
 	for _, tc := range testCases {