introduce query rpc to get the fee config by channel and denom name

proto/composable/ibctransfermiddleware/v1beta1/query.proto

@@ -13,6 +13,10 @@ service Query {
   rpc Params(QueryParamsRequest) returns (QueryParamsResponse) {
     option (google.api.http).get = "/composable/ibctransfermiddleware/params";
   }
+
+  rpc FeeConfigByChannelAndDenom(QueryFeeConfigByChannelAndDenomRequest) returns (QueryFeeConfigByChannelAndDenomResponse) {
+    option (google.api.http).get = "/composable/ibctransfermiddleware/feeconfigbychannelanddenom";
+  }
 }
 
 // QueryParamsRequest is the request type for the Query/Params RPC method.
@@ -23,3 +27,13 @@ message QueryParamsResponse {
   // params defines the parameters of the module.
   Params params = 1 [ (gogoproto.nullable) = false ];
 }
+
+message QueryFeeConfigByChannelAndDenomRequest {
+  string channel = 1;
+  string denom = 2;
+}
+
+message QueryFeeConfigByChannelAndDenomResponse {
+  // params defines the parameters of the module.
+  CoinItem fees = 1 [ (gogoproto.nullable) = false ];
+}

x/ibctransfermiddleware/client/cli/query.go

@@ -1,10 +1,13 @@
 package cli
 
 import (
+	"fmt"
+
 	"github.com/spf13/cobra"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/client/flags"
+	"github.com/cosmos/cosmos-sdk/version"
 	"github.com/notional-labs/composable/v6/x/ibctransfermiddleware/types"
 )
 
@@ -20,6 +23,7 @@ func GetQueryCmd() *cobra.Command {
 
 	ibctransfermiddlewareParamsQueryCmd.AddCommand(
 		GetCmdQueryParams(),
+		GetFeeConfigByChannelAndDenom(),
 	)
 
 	return ibctransfermiddlewareParamsQueryCmd
@@ -53,3 +57,34 @@ func GetCmdQueryParams() *cobra.Command {
 
 	return cmd
 }
+
+func GetFeeConfigByChannelAndDenom() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:     "FeeConfigByChannelAndDenom",
+		Short:   "Query bridge fee config by channel and denom",
+		Args:    cobra.MatchAll(cobra.ExactArgs(2), cobra.OnlyValidArgs),
+		Example: fmt.Sprintf("%s query ibctransfermiddleware FeeConfigByChannelAndDenom [channel] [denom]", version.AppName),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+			queryClient := types.NewQueryClient(clientCtx)
+
+			params := &types.QueryFeeConfigByChannelAndDenomRequest{
+				Channel: args[0],
+				Denom:   args[1],
+			}
+			res, err := queryClient.FeeConfigByChannelAndDenom(cmd.Context(), params)
+			if err != nil {
+				return err
+			}
+
+			return clientCtx.PrintProto(&res.Fees)
+		},
+	}
+
+	flags.AddQueryFlagsToCmd(cmd)
+
+	return cmd
+}

x/ibctransfermiddleware/keeper/grpc_query.go

@@ -2,6 +2,7 @@
 
 import (
 	"context"
+	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
@@ -17,3 +18,20 @@
 
 	return &types.QueryParamsResponse{Params: params}, nil
 }
+
+// ChannelFees returns channel fees of the staking middleware module.
+func (k Keeper) FeeConfigByChannelAndDenom(c context.Context, req *types.QueryFeeConfigByChannelAndDenomRequest) (*types.QueryFeeConfigByChannelAndDenomResponse, error) {
+	ctx := sdk.UnwrapSDKContext(c)
+	feeConfig := k.GetCoin(ctx, req.Channel, req.Denom)
+	if feeConfig == nil {
+		return nil, fmt.Errorf("fee configuration not found for channel %s and denom %s", req.Channel, req.Denom)
+	} else {
+		ret_fee_config := types.CoinItem{
+			MinFee:        feeConfig.MinFee,
+			Percentage:    feeConfig.Percentage,
+			TxPriorityFee: feeConfig.TxPriorityFee,
+		}
+		return &types.QueryFeeConfigByChannelAndDenomResponse{Fees: ret_fee_config}, nil
+	}
+
+}