perf: minimize necessary execution on recvpacket checktx (backport #6302) (#6334)

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

* perf: only perform core ibc logic on recvpacket checktx

* try me linter

* fix: reorder if and add comment

* chore: add changelog entry

(cherry picked from commit 0993246)

# Conflicts:
#	CHANGELOG.md
#	modules/core/ante/ante.go
#	modules/core/ante/ante_test.go

* fix: merge conflicts

---------

Co-authored-by: colin axnér <[email protected]>

Author: mergify[bot]

CHANGELOG.md

@@ -44,6 +44,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### 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
 
 ### Bug Fixes

modules/core/ante/ante.go

@@ -2,6 +2,7 @@ package ante
 
 import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 
 	clienttypes "github.com/cosmos/ibc-go/v7/modules/core/02-client/types"
 	channeltypes "github.com/cosmos/ibc-go/v7/modules/core/04-channel/types"
@@ -30,10 +31,22 @@ 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(sdk.WrapSDKContext(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(sdk.WrapSDKContext(ctx), msg)
+				} else {
+					response, err = rrd.recvPacketCheckTx(ctx, msg)
+				}
 				if err != nil {
 					return ctx, err
 				}
+
 				if response.Result == channeltypes.NOOP {
 					redundancies++
 				}
@@ -90,3 +103,29 @@ 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, sdkerrors.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, sdkerrors.Wrap(err, "receive packet verification failed")
+	}
+
+	return &channeltypes.MsgRecvPacketResponse{Result: channeltypes.SUCCESS}, nil
+}

modules/core/ante/ante_test.go

@@ -3,10 +3,11 @@ package ante_test
 import (
 	"testing"
 
-	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
 
+	sdk "github.com/cosmos/cosmos-sdk/types"
+
 	clienttypes "github.com/cosmos/ibc-go/v7/modules/core/02-client/types"
 	channeltypes "github.com/cosmos/ibc-go/v7/modules/core/04-channel/types"
 	host "github.com/cosmos/ibc-go/v7/modules/core/24-host"
@@ -45,7 +46,7 @@ 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)
 
@@ -450,6 +451,15 @@ 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 {