具有multer和shortid的每次上传的Node.js唯一文件夹

我使用shortid为每个上传的唯一ID，并为post处理程序进行multer。

我正在上传一些输入​​以及图像。我想将每个上传内容存储在“upload / XXXXX”中我在app.post（...）上生成唯一ID，并想知道如何将此id发送到multer。

如果同时完成2个帖子，使用全局变量会有问题吗？

var Storage = multer.diskStorage({
  destination: function (req, file, callback) {
    callback(null, path.join(__dirname, 'uploads', XXXXX)); //Unique id for file is the same as Folder
  },
  filename: function (req, file, callback) {
    callback(null, XXXXX); //Unique id
  }
});

var upload = multer({
  storage: Storage
}).single('pic');

//tell express what to do when the route is requested
app.post('/fbshare', function (req, res, next) {
  let ui = shortid();
  upload(req, res, function (err) {
    if (err) {
      return res.end("Something went wrong!");
    }
    return res.end("File uploaded sucessfully!.");
  });
});

我怎么能从app.post（）通过ui到存储？或者，如果你有更好的解决方案，我会全力以赴。

谢谢

结局Solutyon

var Storage = multer.diskStorage({
  destination: function (req, file, callback) {
    fs.mkdir(path.join(__dirname, 'uploads', req.ui), function(){
       callback(null, path.join(__dirname, 'uploads', req.ui));
    });
  },
  filename: function (req, file, callback) {
    callback(null, req.ui + file.originalname.substring(file.originalname.indexOf('.'), file.originalname.length));
  }
});

var upload = multer({
  storage: Storage
}).single('pic');

//tell express what to do when the route is requested
app.post('/fbshare', function (req, res, next) {
  req.ui = shortid();
  upload(req, res, function (err) {
    if (err) {
      return res.end("Something went wrong!");
    }
    return res.end("File uploaded sucessfully!.");
  });

});

这个怎么样？

app.post('/fbshare', function (req, res, next) {
  req.ui = shortid(); // create the id in the request
....

然后在闷车

var Storage = multer.diskStorage({
  destination: function (req, file, callback) {
    callback(null, path.join(__dirname, 'uploads', req.ui)); //Unique id for     
....

和filename一样