How to model {key:value, key:value, ...} object in the ProtoBuf

[MantasS]

I'm trying to model this JSON into ProtoBuff reply:

{ 

 "0xc02aaa39b223fe8d4a0e5c4f27ead9083c756cc2": "73185315951404654", "0x111111111117dc0aa78b770fa6a738034120c302": "90483392540197705773", "0xdac17f958d2ee523a2206206944597c13d831ec7": "2599292593",

 }

Tried to use map:

message Reply { map<string, string> balances = 1; }

but ended up with this error message: 

Object literal may only specify known properties, and '0xc02aaa39b223fe8d4a0e5c4f27ead9083c756cc2' does not exist in type 'Reply'.

Is there a way to return this type of JSON?

[Josh Humphries]

The map field didn't work because it would be an object inside the reply -- like so:

{

  "balances": {

    "somekey": "somevalue"

  }

}

To make the top-level object an arbitrary map, it would need to be a google.protobuf.Struct. This type is basically analogous to a JSON object with arbitrary keys/properties.

The downside to that type is that it is not type-safe: the values can be any type. So you'd need to do something special in the consuming code to check that all values are of an expected type (e.g. string).

----
Josh Humphries
jh...@bluegosling.com

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