Is `google.protobuf.Struct` the Optimal Choice for Sending Dynamic JSON via gRPC?

Is "google/protobuf/struct.proto" the Best Way to Send Dynamic JSON over GRPC?

Utilizing the google.protobuf.Struct type provides an efficient solution for transmitting dynamic JSON data over GRPC. Consider the following User.proto file:

syntax = "proto3";
package messages;
import "google/protobuf/struct.proto";

service UserService {
    rpc SendJson (SendJsonRequest) returns (SendJsonResponse) {}
}

message SendJsonRequest {
    string UserID = 1;
    google.protobuf.Struct Details = 2;
}

message SendJsonResponse {
    string Response = 1;
}

Anuj's Solution:

While functional, this approach is somewhat convoluted:

var item = &structpb.Struct{
    Fields: map[string]*structpb.Value{
        "name": &structpb.Value{
            Kind: &structpb.Value_StringValue{
                StringValue: "Anuj",
            },
        },
        "age": &structpb.Value{
            Kind: &structpb.Value_StringValue{
                StringValue: "Anuj",
            },
        },
    },
}

Luke's Solution:

This method is more concise but involves multiple conversions:

m := map[string]interface{}{
  "foo":"bar",
  "baz":123,
}
b, err := json.Marshal(m)
s := &structpb.Struct{}
err = protojson.Unmarshal(b, s)

Recommended Solution:

The most straightforward and efficient approach is to utilize the built-in functions provided by the structpb package:

m := map[string]interface{}{
    "name": "Anuj",
    "age":  23,
}

details, err := structpb.NewStruct(m) // Check for errors as per documentation
if err != nil {
    panic(err)
}

userGetRequest := &pb.SendJsonRequest{
    UserID: "A123",
    Details: details,
}

Remember to adhere to the conversion rules specified in the structpb documentation to avoid errors.

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