javascript - nodejs multer diskstorage 在保存到磁盘后删除文件

Question

我正在使用 multer diskstorage 将文件保存到磁盘。我首先将它保存到磁盘并对文件进行一些操作，然后我使用另一个函数和 lib 将它上传到远程存储桶。上传完成后，我想将其从磁盘中删除。

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, '/tmp/my-uploads')
  },
  filename: function (req, file, cb) {
    cb(null, file.fieldname + '-' + Date.now())
  }
})

var upload = multer({ storage: storage }).single('file')

下面是我如何使用它:

app.post('/api/photo', function (req, res) {
    upload(req, res, function (err) {
        uploadToRemoteBucket(req.file.path)
        .then(data => {
            // delete from disk first

            res.end("UPLOAD COMPLETED!");
        })
    })
});

如何使用 diskStorage 删除功能删除临时文件夹中的文件？ https://github.com/expressjs/multer/blob/master/storage/disk.js#L54

更新:

我已经决定将它模块化并放在另一个文件中:

const fileUpload = function(req, res, cb) {
    upload(req, res, function (err) {
        uploadToRemoteBucket(req.file.path)
        .then(data => {
            // delete from disk first

            res.end("UPLOAD COMPLETED!");
        })
    })
}

module.exports = { fileUpload };

Answer 1

您不需要使用 multer 来删除文件，而且 _removeFile 是一个您不应该不使用的私有(private)函数。

您将像往常一样通过 fs.unlink 删除文件.因此，无论您在何处访问 req.file，都可以执行以下操作:

const fs = require('fs')
const { promisify } = require('util')

const unlinkAsync = promisify(fs.unlink)

// ...

const storage = multer.diskStorage({
    destination(req, file, cb) {
      cb(null, '/tmp/my-uploads')
    },
    filename(req, file, cb) {
      cb(null, `${file.fieldname}-${Date.now()}`)
    }
  })

const upload = multer({ storage: storage }).single('file')

app.post('/api/photo', upload, async (req, res) =>{
    // You aren't doing anything with data so no need for the return value
    await uploadToRemoteBucket(req.file.path)

    // Delete the file like normal
    await unlinkAsync(req.file.path)

    res.end("UPLOAD COMPLETED!")
})