获取 Google Drive NodeJS 客户端的上传进度？

当我们从以下位置获取请求对象后req = drive.files.insert如何使用它查找文件上传进度？

我在req string多次调用但无济于事。

function uploadFile(){
    var path = untildify("~/workspace/incomplete/aw.jpg");
    var drive = google.drive('v2');

    var req = drive.files.insert({
        resource: {
            title: 'aw.jpg'
        },
        media: {
            body: fs.createReadStream(path)
        },
        auth: oauth2Client
    }, function(err, response) {
        if (err)
            console.log(err);
        // else
        //  console.log(response);
    });

    console.log(req);
}

这是如何完成的

function uploadFile(){
    var path = untildify("~/workspace/a.jpg");
    var drive = google.drive('v2');
    console.log('start upload');
    var req = drive.files.insert({
        resource: {
            title: "a.jpg"
        },
        media: {
            body: fs.createReadStream(path)
        },
        auth: oauth2Client
    }, function(err, response, body) {
        if (err) {
            console.log(err);
        } else {
            console.log('finish upload');
            clearInterval(q);
        }
    });
    var q = setInterval(function () {
         console.log("Uploaded: " + req.req.connection.bytesWritten);
     }, 250);
}

参考 ：Node.js 进度指示器反馈- 瑞尔的回答

并特别感谢瑞安·赛斯帮助我。