code: function createCreateStreamWrap(api) {
    return function createStreamWrap(create_stream) {
      return function create_stream_trace() {
        if (!this.stream) {
          Object.defineProperty(this, 'stream', {
            get: function () { return this._google_trace_stream; },
            set: function (val) {
              api.wrapEmitter(val);
              this._google_trace_stream = val;
            }
          });
        }
        return create_stream.apply(this, arguments);
      };
    };
  }
docs: Used for redis version > 2.3