问云函数实现数据万象生成缩略图再保存回bucket？

const path = require('path')
const request = require('request')
const COS = require('cos-nodejs-sdk-v5')
const config = {
    SecretId: 'my-id',
    SecretKey: 'my-key',
    Host: 'xxxx-88888888.cos.na-toronto.myqcloud.com',
    Bucket: 'xxxx-88888888',
    Region: 'na-toronto',
}
var cos = new COS({
    // 必选参数
    SecretId: config.SecretId,
    SecretKey: config.SecretKey,
   
});

exports.main_handler = async (event, context, callback) => {
let thumbImgName = '/thumb_propertyImages'
let { Records } = event
// 获取cos签名
var auth = cos.getAuth({
    Method: 'get',
    Key: Records[0].cos.cosObject.key,
    // Key: url,
    Expires: 60,
});
// 设置http请求参数
var options = {
        url: 'https://'+config.Host+Records[0].cos.cosObject.key+'?image_process',
        headers: {
            'Pic-Operations': JSON.stringify({"is_pic_info":1,"rules":[{"fileid":thumbImgName,"rule":"imageView2/1/w/750/h/560"}]}),
            'Authorization': auth,
            //'Content-Length': Records[0].cos.cosObject.size
        },
};
// http 请求开始
request.post(options,(err, response, body)=>{
  console.log("err",err);
  console.log("response",response);
  console.log("body",body);
  return 'test';
})
}