add query for target supply (#817)

Co-authored-by: Reece Williams <[email protected]>

proto/juno/mint/query.proto

@@ -24,6 +24,12 @@ service Query {
       returns (QueryAnnualProvisionsResponse) {
     option (google.api.http).get = "/cosmos/mint/v1beta1/annual_provisions";
   }
+
+  // TargetSupply current target supply for this phase value.
+  rpc TargetSupply(QueryTargetSupplyRequest)
+      returns (QueryTargetSupplyResponse) {
+    option (google.api.http).get = "/cosmos/mint/v1beta1/target_supply";
+  }
 }
 
 // QueryParamsRequest is the request type for the Query/Params RPC method.
@@ -61,3 +67,17 @@ message QueryAnnualProvisionsResponse {
     (gogoproto.nullable) = false
   ];
 }
+
+// QueryTargetSupplyRequest is the request type for the
+// Query/TargetSupply RPC method.
+message QueryTargetSupplyRequest {}
+
+// QueryTargetSupplyResponse is the response type for the
+// Query/TargetSupply RPC method.
+message QueryTargetSupplyResponse {
+  // target_supply is the target supply for this phase value.
+  bytes target_supply = 1 [
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
+    (gogoproto.nullable) = false
+  ];
+}

x/mint/client/cli/query.go

@@ -25,6 +25,7 @@ func GetQueryCmd() *cobra.Command {
 		GetCmdQueryParams(),
 		GetCmdQueryInflation(),
 		GetCmdQueryAnnualProvisions(),
+		GetCmqQueryTargetSupply(),
 	)
 
 	return mintingQueryCmd
@@ -116,3 +117,31 @@ func GetCmdQueryAnnualProvisions() *cobra.Command {
 
 	return cmd
 }
+
+// GetCmqQueryTargetSupply implements a command to return the current target supply value.
+func GetCmqQueryTargetSupply() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "target-supply",
+		Short: "Query the current target supply for this phase value",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+			queryClient := types.NewQueryClient(clientCtx)
+
+			params := &types.QueryTargetSupplyRequest{}
+			res, err := queryClient.TargetSupply(cmd.Context(), params)
+			if err != nil {
+				return err
+			}
+
+			return clientCtx.PrintString(fmt.Sprintf("%s\n", res.TargetSupply))
+		},
+	}
+
+	flags.AddQueryFlagsToCmd(cmd)
+
+	return cmd
+}

x/mint/keeper/grpc_query.go

@@ -33,3 +33,11 @@ func (k Keeper) AnnualProvisions(c context.Context, _ *types.QueryAnnualProvisio
 
 	return &types.QueryAnnualProvisionsResponse{AnnualProvisions: minter.AnnualProvisions}, nil
 }
+
+// Target supply returns minter.TargetSupply of the mint module.
+func (k Keeper) TargetSupply(c context.Context, _ *types.QueryTargetSupplyRequest) (*types.QueryTargetSupplyResponse, error) {
+	ctx := sdk.UnwrapSDKContext(c)
+	minter := k.GetMinter(ctx)
+
+	return &types.QueryTargetSupplyResponse{TargetSupply: minter.TargetSupply}, nil
+}