从google云功能上传图片到云存储

我正在尝试使用google云功能处理文件上传。此函数使用busboy解析多部分表单数据,然后上载到google云存储。

我一直收到同样的错误: ERROR: { Error: ENOENT: no such file or directory, open '/tmp/xxx.png' 触发功能时出错。

错误似乎发生在 finish 当storage.bucket.upload(file)试图打开文件路径时的回调函数 /tmp/xxx.png 是的。

请注意,我无法生成中建议的签名上载URL this question 因为调用它的应用程序是一个外部的非用户应用程序。我也不能直接上传到gcs,因为我需要根据一些请求元数据创建自定义文件名。我应该改用谷歌应用引擎吗?

功能代码:

const path = require('path');
const os = require('os');
const fs = require('fs');
const Busboy = require('busboy');
const Storage = require('@google-cloud/storage');
const _ = require('lodash');

const projectId = 'xxx';
const bucketName = 'xxx';


const storage = new Storage({
  projectId: projectId,
});

exports.uploadFile = (req, res) => {
    if (req.method === 'POST') {
        const busboy = new Busboy({ headers: req.headers });
        const uploads = []
        const tmpdir = os.tmpdir();

        busboy.on('file', (fieldname, file, filename, encoding, mimetype) => {
            const filepath = path.join(tmpdir, filename)
            var obj = {
                path: filepath, 
                name: filename
            }
            uploads.push(obj);

            var writeStream = fs.createWriteStream(obj.path);
            file.pipe(writeStream);
        });

        busboy.on('finish', () => {
            _.forEach(uploads, function(file) {

                storage
                .bucket(bucketName)
                .upload(file.path, {name: file.name})
                .then(() => {
                  console.log(`${file.name} uploaded to ${bucketName}.`);
                })
                .catch(err => {
                  console.error('ERROR:', err);
                });


                fs.unlinkSync(file.path);
            })

            res.end()
        });

        busboy.end(req.rawBody);
    } else {
        res.status(405).end();
    }
}