Add function to query ack proofs (#7732)

* Add function to query ack proofs

* Fix compilation issue

Co-authored-by: Aditya <adityasripal@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

x/ibc/core/04-channel/client/utils/utils.go

@@ -231,3 +231,36 @@ func queryNextSequenceRecvABCI(clientCtx client.Context, portID, channelID strin
 
 	return types.NewQueryNextSequenceReceiveResponse(sequence, proofBz, proofHeight), nil
 }
+
+// QueryPacketAcknowledgement returns the data about a packet acknowledgement.
+// If prove is true, it performs an ABCI store query in order to retrieve the merkle proof. Otherwise,
+// it uses the gRPC query client
+func QueryPacketAcknowledgement(clientCtx client.Context, portID, channelID string, sequence uint64, prove bool) (*types.QueryPacketAcknowledgementResponse, error) {
+	if prove {
+		return queryPacketAcknowledgementABCI(clientCtx, portID, channelID, sequence)
+	}
+
+	queryClient := types.NewQueryClient(clientCtx)
+	req := &types.QueryPacketAcknowledgementRequest{
+		PortId:    portID,
+		ChannelId: channelID,
+		Sequence:  sequence,
+	}
+
+	return queryClient.PacketAcknowledgement(context.Background(), req)
+}
+
+func queryPacketAcknowledgementABCI(clientCtx client.Context, portID, channelID string, sequence uint64) (*types.QueryPacketAcknowledgementResponse, error) {
+	key := host.KeyPacketAcknowledgement(portID, channelID, sequence)
+
+	value, proofBz, proofHeight, err := ibcclient.QueryTendermintProof(clientCtx, key)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(value) == 0 {
+		return nil, sdkerrors.Wrapf(types.ErrInvalidAcknowledgement, "portID (%s), channelID (%s), sequence (%d)", portID, channelID, sequence)
+	}
+
+	return types.NewQueryPacketAcknowledgementResponse(value, proofBz, proofHeight), nil
+}