nodejs multer diskstorage保存到磁盘后删除文件 [英] nodejs multer diskstorage to delete file after saving to disk

问题描述

我正在使用multer磁盘存储将文件保存到磁盘.我首先将其保存到磁盘，并对文件进行一些操作，然后使用另一个函数和lib将其上传到远程存储桶.上传完成后，我想从磁盘上删除它.

I am using multer diskstorage to save a file to disk. I first save it to the disk and do some operations with the file and then i upload it to remote bucket using another function and lib. Once the upload is finished, i would like to delete it from the disk.

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')

这是我的用法:

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!");
        })
    })
});

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

how can i use the diskStorage remove function to remove the files in the temp folder? https://github.com/expressjs/multer/blob/master/storage/disk.js#L54

我决定将其模块化，并将其放入另一个文件中

I have decided to make it modular and put it in another file:

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 };

推荐答案

您无需使用 multer 删除文件，并且 _removeFile 是私有函数您不应该不使用.

You don't need to use multer to delete the file and besides _removeFile is a private function that you should not use.

您通常会通过 fs.unlink .因此，只要您可以访问 req.file ，您都可以执行以下操作:

You'd delete the file as you normally would via fs.unlink. So wherever you have access to req.file, you can do the following:

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!")
})

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