code: func (r *Region) GetContext() *kvrpcpb.Context {
  	return &kvrpcpb.Context{
  		RegionId:    r.meta.Id,
  		RegionEpoch: r.meta.RegionEpoch,
  		Peer:        r.peer,
  	}
  }
docs: // GetContext constructs kvprotopb.Context from region info.