你能代表一个在 proto3 中可以有任意字段的 object 吗？

Question

Consider the following json representation of an object

{
   "format":  "0.0.1",
   "has_impl": true,

   "mtv_1b": 1,
   "mtv_1c": "h",
   "ktc_12": true,
   "ktc_zz": true,
}

The first two format and has_impl fields are known. In addition, the object may have arbitrary number of mtv_XX and ktc_XX like fields.

Is such an object representable in proto3 and how would you go at it?

The following could be an obvious starting point. Are there a combination of oneOf , WellKnownTypes that could be used here?

message MyObject {

   string format  = 0;
   bool has_impl = 1;


   // Is there anything that can go in here ? 
   ....

}

Answer 1

Not directly. The closest you can do would be to have a Struct (which is a map<string, Value> , where Value is a oneof over common types), using struct.proto . Not quite the same, but allows the same ideas.