add grpc querier for wasm (#2083)

* add grpc querier encoder for wasm

* update changelog

* fix comment for GrpcQuerier

CHANGELOG.md

@@ -40,6 +40,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Features
 
 * Create a script for updating links in the spec docs to proto messages [#2068](https://github.com/provenance-io/provenance/pull/2068).
+* Add grpc querier for cosmwasm 2.1.0 smart contracts [#2083](https://github.com/provenance-io/provenance/pull/2083).
 
 ### Improvements
 

internal/provwasm/query_plugins.go

@@ -57,6 +57,7 @@ func QueryPlugins(registry *QuerierRegistry, queryRouter baseapp.GRPCQueryRouter
 	return &wasmkeeper.QueryPlugins{
 		Custom:   customPlugins(registry),
 		Stargate: StargateQuerier(queryRouter, stargateCdc),
+		Grpc:     GrpcQuerier(queryRouter),
 	}
 }
 
@@ -121,6 +122,31 @@ func StargateQuerier(queryRouter baseapp.GRPCQueryRouter, cdc codec.Codec) func(
 	}
 }
 
+// GrpcQuerier dispatches whitelisted queries and returns protobuf encoded responses
+func GrpcQuerier(queryRouter baseapp.GRPCQueryRouter) func(ctx sdk.Context, request *wasmvmtypes.GrpcQuery) (proto.Message, error) {
+	return func(ctx sdk.Context, request *wasmvmtypes.GrpcQuery) (proto.Message, error) {
+		_, err := GetWhitelistedQuery(request.Path)
+		if err != nil {
+			return nil, err
+		}
+
+		route := queryRouter.Route(request.Path)
+		if route == nil {
+			return nil, wasmvmtypes.UnsupportedRequest{Kind: fmt.Sprintf("No route to query '%s'", request.Path)}
+		}
+
+		res, err := route(ctx, &abci.RequestQuery{
+			Data: request.Data,
+			Path: request.Path,
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		return res, nil
+	}
+}
+
 // ConvertProtoToJsonMarshal  unmarshals the given bytes into a proto message and then marshals it to json.
 // This is done so that clients calling stargate queries do not need to define their own proto unmarshalers,
 // being able to use response directly by json marshaling, which is supported in cosmwasm.