I just found out about `proto.google.protobuf.Struct.fromJavaScript` and
tried it:
```
// code
struct = proto.google.protobuf.Struct.fromJavaScript(vars);
req = new Request;
req.variables = struct;
```
This works for a simple `obj` (e.g. `{"key": "val"}`), but for an `obj`
with a proto message field (such as above) it resulted in :
```
struct_pb.js:875 Uncaught Error: Unexpected struct type.
at Function.proto.google.protobuf.Value.fromJavaScript
(struct_pb.js:875)
at Function.proto.google.protobuf.Struct.fromJavaScript
(struct_pb.js:941)
at Function.proto.google.protobuf.Value.fromJavaScript
(struct_pb.js:871)
at Function.proto.google.protobuf.Struct.fromJavaScript
(struct_pb.js:941)
at Function.proto.google.protobuf.Value.fromJavaScript
(struct_pb.js:871)
at Function.proto.google.protobuf.Struct.fromJavaScript
(struct_pb.js:941)
at Function.proto.google.protobuf.Value.fromJavaScript
(struct_pb.js:871)
at Function.proto.google.protobuf.Struct.fromJavaScript
(struct_pb.js:941)
```
On Friday, July 3, 2020 at 11:12:31 PM UTC+2, [email protected] wrote:
>
> I've been struggling with passing a JSON with Message values back and
> forth between a browser (grpc-web) and server (python grpc). A Struct seems
> to be the way but even though the struct I'm sending looks perfectly fine,
> it is empty once received by the server.
>
> ```
> // proto
> message Result {
> google.protobuf.Struct variables = 1;
> }
>
> // obj - Where variables would contain a (1 level deep) JSON with
> different types of values, e.g.:
> {
> "key1": 1,
> "key2": true,
> "key3": proto_msg_a //instance of proto.MessageA
> }
>
> // code (js in browser using grpc-web)
> struct = new proto.google.protobuf.Struct(obj);
> req = new Request;
> req.variables = struct;
>
> ```
>
> Checking `req.variables` before sending shows that it's indeed a `Struct`
> with all the correct fields in it. But once the other end (server) receives
> it `req.variables` is an empty `Struct`. For testing purposes I tried an
> `obj` that is simply `{'key': 'value'}`, but the result was the same.
>
>
> I would really like to use proto messages in variables. The reason for
> picking protobuf/grpc was exactly this, being able to use the same type
> throughout our complete platform, but this seems to be blocking this goal.
> Did I miss something? What would you do?
>
> I've also asked this on StackOverflow:
> https://stackoverflow.com/questions/62693938/grpc-passing-json-with-proto-message-field-between-browser-and-server
>
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