Get JsonObject from google.protobuf.Struct

[marcodallaba]

Problem solved by the feature

Currently the easiest way to convert a protobuf Struct to a JsonObject is to first print it to String using JsonFormat.printer().print() and the read the String using gson.fromJson method. Something like this:

String jsonString = JsonFormat.printer().omittingInsignificantWhitespace().print(struct);
JsonObject jsonObject = gson.FromJson(jsonString, JsonObject.class);

This is slightly inefficient in my opinion since there is a two step conversion and can be optimized to have a single conversion from Struct to JsonObject

Feature description

Please, is it possible to implement a method fromProtobufStruct (or fromStruct) that converts a Struct to a JsonObject?

[Marcono1234]

Gson has the proto module, maybe that would help for your use case? However that module is currently not published (see also #690; not sure if the rationale there still applies), and the JSON format is likely not the same which Protobuf's JsonFormat produces.

If Gson offered the functionality you proposed, I am not sure to what extend it would have to reimplement the logic of Protobuf's JsonFormat. It seems Protobuf uses Gson for some aspects internally, but that seems to be an implementation detail (and for JsonFormat.printer() it manually performs JSON serialization, not using Gson's JsonElement or similar).

Note that I am not very familiar with Protobuf, and I am not a direct member of the Gson project.