chore: impl packet acknowledgement query

modules/core/04-channel/v2/client/cli/abci.go

@@ -24,3 +24,18 @@ func queryPacketCommitmentABCI(clientCtx client.Context, channelID string, seque
 
 	return types.NewQueryPacketCommitmentResponse(value, proofBz, proofHeight), nil
 }
+
+func queryPacketAcknowledgementABCI(clientCtx client.Context, channelID string, sequence uint64) (*types.QueryPacketAcknowledgementResponse, error) {
+	key := host.PacketAcknowledgementKey(channelID, sequence)
+	value, proofBz, proofHeight, err := ibcclient.QueryTendermintProof(clientCtx, key)
+	if err != nil {
+		return nil, err
+	}
+
+	// check if packet commitment exists
+	if len(value) == 0 {
+		return nil, errorsmod.Wrapf(types.ErrAcknowledgementNotFound, "channelID (%s), sequence (%d)", channelID, sequence)
+	}
+
+	return types.NewQueryPacketAcknowledgementResponse(value, proofBz, proofHeight), nil
+}

modules/core/04-channel/v2/client/cli/cli.go

@@ -21,6 +21,7 @@ func GetQueryCmd() *cobra.Command {
 	queryCmd.AddCommand(
 		getCmdQueryChannel(),
 		getCmdQueryPacketCommitment(),
+		getCmdQueryPacketAcknowledgement(),
 	)
 
 	return queryCmd

modules/core/04-channel/v2/client/cli/query.go

@@ -94,3 +94,54 @@ func getCmdQueryPacketCommitment() *cobra.Command {
 
 	return cmd
 }
+
+func getCmdQueryPacketAcknowledgement() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "packet-acknowledgement [channel-id] [sequence]",
+		Short: "Query a channel/v2 packet acknowledgement",
+		Long:  "Query a channel/v2 packet acknowledgement by channel-id and sequence",
+		Example: fmt.Sprintf(
+			"%s query %s %s packet-acknowledgement [channel-id] [sequence]", version.AppName, exported.ModuleName, types.SubModuleName,
+		),
+		Args: cobra.ExactArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+
+			channelID := args[0]
+			seq, err := strconv.ParseUint(args[1], 10, 64)
+			if err != nil {
+				return err
+			}
+
+			prove, err := cmd.Flags().GetBool(flags.FlagProve)
+			if err != nil {
+				return err
+			}
+
+			if prove {
+				res, err := queryPacketAcknowledgementABCI(clientCtx, channelID, seq)
+				if err != nil {
+					return err
+				}
+
+				return clientCtx.PrintProto(res)
+			}
+
+			queryClient := types.NewQueryClient(clientCtx)
+			res, err := queryClient.PacketAcknowledgement(cmd.Context(), types.NewQueryPacketAcknowledgementRequest(channelID, seq))
+			if err != nil {
+				return err
+			}
+
+			return clientCtx.PrintProto(res)
+		},
+	}
+
+	cmd.Flags().Bool(flags.FlagProve, true, "show proofs for the query results")
+	flags.AddQueryFlagsToCmd(cmd)
+
+	return cmd
+}

modules/core/04-channel/v2/keeper/grpc_query.go

@@ -75,3 +75,29 @@ func (q *queryServer) PacketCommitment(ctx context.Context, req *types.QueryPack
 
 	return types.NewQueryPacketCommitmentResponse(commitment, nil, clienttypes.GetSelfHeight(ctx)), nil
 }
+
+// PacketAcknowledgement implements the Query/PacketAcknowledgement gRPC method.
+func (q *queryServer) PacketAcknowledgement(ctx context.Context, req *types.QueryPacketAcknowledgementRequest) (*types.QueryPacketAcknowledgementResponse, error) {
+	if req == nil {
+		return nil, status.Error(codes.InvalidArgument, "empty request")
+	}
+
+	if err := host.ClientIdentifierValidator(req.ChannelId); err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	if req.Sequence == 0 {
+		return nil, status.Error(codes.InvalidArgument, "packet sequence cannot be 0")
+	}
+
+	if !q.HasChannel(ctx, req.ChannelId) {
+		return nil, status.Error(codes.NotFound, errorsmod.Wrap(types.ErrChannelNotFound, req.ChannelId).Error())
+	}
+
+	acknowledgement := q.GetPacketAcknowledgement(ctx, req.ChannelId, req.Sequence)
+	if len(acknowledgement) == 0 {
+		return nil, status.Error(codes.NotFound, "packet acknowledgement hash not found")
+	}
+
+	return types.NewQueryPacketAcknowledgementResponse(acknowledgement, nil, clienttypes.GetSelfHeight(ctx)), nil
+}

modules/core/04-channel/v2/keeper/grpc_query_test.go

@@ -220,3 +220,107 @@ func (suite *KeeperTestSuite) TestQueryPacketCommitment() {
 		})
 	}
 }
+
+func (suite *KeeperTestSuite) TestQueryPacketAcknowledgement() {
+	var (
+		expAcknowledgement []byte
+		path               *ibctesting.Path
+		req                *types.QueryPacketAcknowledgementRequest
+	)
+
+	testCases := []struct {
+		msg      string
+		malleate func()
+		expError error
+	}{
+		{
+			"success",
+			func() {
+				path = ibctesting.NewPath(suite.chainA, suite.chainB)
+				path.SetupV2()
+
+				expAcknowledgement = []byte("acknowledgementHash")
+				suite.chainA.App.GetIBCKeeper().ChannelKeeperV2.SetPacketAcknowledgement(suite.chainA.GetContext(), path.EndpointA.ChannelID, 1, expAcknowledgement)
+
+				req = &types.QueryPacketAcknowledgementRequest{
+					ChannelId: path.EndpointA.ChannelID,
+					Sequence:  1,
+				}
+			},
+			nil,
+		},
+		{
+			"empty request",
+			func() {
+				req = nil
+			},
+			status.Error(codes.InvalidArgument, "empty request"),
+		},
+		{
+			"invalid channel ID",
+			func() {
+				req = &types.QueryPacketAcknowledgementRequest{
+					ChannelId: "",
+					Sequence:  1,
+				}
+			},
+			status.Error(codes.InvalidArgument, "identifier cannot be blank: invalid identifier"),
+		},
+		{
+			"invalid sequence",
+			func() {
+				req = &types.QueryPacketAcknowledgementRequest{
+					ChannelId: ibctesting.FirstChannelID,
+					Sequence:  0,
+				}
+			},
+			status.Error(codes.InvalidArgument, "packet sequence cannot be 0"),
+		},
+		{
+			"channel not found",
+			func() {
+				req = &types.QueryPacketAcknowledgementRequest{
+					ChannelId: "channel-141",
+					Sequence:  1,
+				}
+			},
+			status.Error(codes.NotFound, fmt.Sprintf("%s: channel not found", "channel-141")),
+		},
+		{
+			"acknowledgement not found",
+			func() {
+				path := ibctesting.NewPath(suite.chainA, suite.chainB)
+				path.SetupV2()
+
+				req = &types.QueryPacketAcknowledgementRequest{
+					ChannelId: path.EndpointA.ChannelID,
+					Sequence:  1,
+				}
+			},
+			status.Error(codes.NotFound, "packet acknowledgement hash not found"),
+		},
+	}
+
+	for _, tc := range testCases {
+		tc := tc
+
+		suite.Run(fmt.Sprintf("Case %s", tc.msg), func() {
+			suite.SetupTest() // reset
+
+			tc.malleate()
+
+			queryServer := keeper.NewQueryServer(suite.chainA.GetSimApp().IBCKeeper.ChannelKeeperV2)
+			res, err := queryServer.PacketAcknowledgement(suite.chainA.GetContext(), req)
+
+			expPass := tc.expError == nil
+			if expPass {
+				suite.Require().NoError(err)
+				suite.Require().NotNil(res)
+				suite.Require().Equal(expAcknowledgement, res.Acknowledgement)
+			} else {
+				suite.Require().ErrorIs(err, tc.expError)
+				suite.Require().Nil(res)
+			}
+		})
+	}
+}

modules/core/04-channel/v2/types/errors.go

@@ -12,4 +12,5 @@ var (
 	ErrSequenceSendNotFound     = errorsmod.Register(SubModuleName, 6, "sequence send not found")
 	ErrInvalidAcknowledgement   = errorsmod.Register(SubModuleName, 8, "invalid acknowledgement")
 	ErrPacketCommitmentNotFound = errorsmod.Register(SubModuleName, 9, "packet commitment not found")
+	ErrAcknowledgementNotFound  = errorsmod.Register(SubModuleName, 10, "packet acknowledgement not found")
 )

modules/core/04-channel/v2/types/query.go

@@ -33,3 +33,20 @@ func NewQueryPacketCommitmentResponse(commitmentHash []byte, proof []byte, proof
 		ProofHeight: proofHeight,
 	}
 }
+
+// NewQueryPacketAcknowledgementRequest creates and returns a new packet acknowledgement query request.
+func NewQueryPacketAcknowledgementRequest(channelID string, sequence uint64) *QueryPacketAcknowledgementRequest {
+	return &QueryPacketAcknowledgementRequest{
+		ChannelId: channelID,
+		Sequence:  sequence,
+	}
+}
+
+// NewQueryPacketAcknowledgementResponse creates and returns a new packet acknowledgement query response.
+func NewQueryPacketAcknowledgementResponse(acknowledgementHash []byte, proof []byte, proofHeight clienttypes.Height) *QueryPacketAcknowledgementResponse {
+	return &QueryPacketAcknowledgementResponse{
+		Acknowledgement: acknowledgementHash,
+		Proof:           proof,
+		ProofHeight:     proofHeight,
+	}
+}