There isn't necessary fields in *pb.gw.go file

[Illia-S-dev]

🐛 Bug Report

I have two messages

message DeleteBookRequest {
  string shelf_id = 1; // The ID of the shelf containing the book.
  string book_id = 2;  // The ID of the book to delete.
}
message DeleteBookResponse {}

And there is a readWrite service

service ReadWriteService {
  rpc DeleteBook(DeleteBookRequest) returns (DeleteBookResponse) {
    option (google.api.http) = {
      delete: "/v1/shelves/{shelf_id}/books/{book_id}"
    };
  }
}

To Reproduce

1. Create messages and a service in *.proto
2. run buf generate
3. check *.pb.gw.go file

Expected behavior

There is no errors and I can run for example go run

Actual Behavior

I have the next errors in *.pb.gw.go
for example this func

func request_ReadWriteService_DeleteBook_0(ctx context.Context, marshaler runtime.Marshaler, client ReadWriteServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
	var (
		protoReq DeleteBookRequest
		metadata runtime.ServerMetadata
		err      error
	)
	if req.Body != nil {
		_, _ = io.Copy(io.Discard, req.Body)
	}
	val, ok := pathParams["shelf_id"]
	if !ok {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "shelf_id")
	}
	protoReq.ShelfId, err = runtime.String(val)
	if err != nil {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "shelf_id", err)
	}
	val, ok = pathParams["book_id"]
	if !ok {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "missing parameter %s", "book_id")
	}
	protoReq.BookId, err = runtime.String(val)
	if err != nil {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "book_id", err)
	}
	msg, err := client.DeleteBook(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
	return msg, metadata, err
}

As you can see on the screen, protoReq with type DeleteBookRequest
P.S. The type DeleteBookRequest from *.pb.go

type DeleteBookRequest struct {
	state                  protoimpl.MessageState `protogen:"opaque.v1"`
	xxx_hidden_ShelfId     *string                `protobuf:"bytes,1,opt,name=shelf_id,json=shelfId"`
	xxx_hidden_BookId      *string                `protobuf:"bytes,2,opt,name=book_id,json=bookId"`
	XXX_raceDetectHookData protoimpl.RaceDetectHookData
	XXX_presence           [1]uint32
	unknownFields          protoimpl.UnknownFields
	sizeCache              protoimpl.SizeCache
}

So, protoReq doesn't have both ShelfId and BookId

Your Environment

go version go1.25.3

[johanbrandhorst]

This is an incompatibility with the use of the new Opaque protobuf API. I think to work with the gateway right now you have to set the Hybrid or Open API setting. See here for more information. Does that make sense?