使用Express.js通过gm上传的流文件,以消除双重写入

const express = require('express');
const multer = require('multer');
const gm = require('gm');
const fs = require('fs');
const app = express();

const storage = multer.memoryStorage();
const upload = multer({ storage: storage });

app.post('/upload', upload.single('image'), (req, res) => {
  const image = gm(req.file.buffer);
  image.colorspace('Gray');
  image.toBuffer((err, buffer) => {
    if (err) {
      res.status(500).send('Error converting image to grayscale');
    } else {
      res.send('Image converted to grayscale');
    }
  });
});

app.listen(3000, () => {
  console.log('Server started on port 3000');
});