GRPC Nullable Field

grpc nullable field

I’ve some problem in GRPC as we know that protocol schema very fast and i love to work on it.

In few years playing grpc and have a question about why grpc proto-gen generate a getter method like

type GetBlocksRequest struct {
       Height int64 `protobuf:"varint,1,opt,name=Height,proto3" json:"Height,omitempty"`
}
func (m *GetBlocksRequest) GetHeight() uint32 {
       if m != nil {
              return m.Height
       }
       return 0
}

I need to allow the Height field is nullable field, How ?

So i was digging deeply to how to nullable field on grpc and found the answer. We can use type of that field as a new type we create one which mean created by grpc-proto-gen :).

syntax="proto3";

package model;

import "google/protobuf/struct.proto";

enum OrderBy {
    DESC = 0;
    ASC = 1;
}
message NullableInt64 {
    oneof Kind {
        google.protobuf.NullValue Null = 1;
        int64 Value = 2;
    }
}
message GetBlocksRequest {
    string OrderField = 1;
    OrderBy OrderBy = 2;
    uint32 Page = 3;
    uint32 Limit = 4;
    NullableInt64 Height = 5;
}

As you can see in above there is a message named NullableInt64 it is a oneof kind with google.protobuf.NullValue Null = 1; allowing to have an Null value instead.