如何使用multer将文件通过管道传输到Google Cloud Storage？

const multer = require('multer');
const { Storage } = require('@google-cloud/storage');

const storage = new Storage({
  projectId: 'your-project-id',
  keyFilename: 'path/to/keyfile.json',
});

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

app.post('/upload', upload.single('file'), (req, res) => {
  // 处理文件上传逻辑
});

app.post('/upload', upload.single('file'), (req, res) => {
  const file = req.file;

  const bucketName = 'your-bucket-name';
  const bucket = storage.bucket(bucketName);
  const blob = bucket.file(file.originalname);

  const blobStream = blob.createWriteStream();

  blobStream.on('error', (err) => {
    console.error(err);
    res.status(500).send('文件上传失败');
  });

  blobStream.on('finish', () => {
    res.status(200).send('文件上传成功');
  });

  blobStream.end(file.buffer);
});