使用 Promisify 从回调转换为 Async-Await 格式后，AWS S3 上传不起作用

Question

我正在使用 upload method from aws-sdk 从浏览器中的 React 应用程序将文件上传到 S3 存储桶。

original callback based upload method如下：

var params = {Bucket: 'bucket', Key: 'key', Body: stream};
s3.upload(params, function(err, data) {
  console.log(err, data);
});

我用 promisify 包装它以像异步等待一样工作，如下所示：

const AWS = require('aws-sdk');
const { promisify } = require('es6-promisify');

... <in my React component> ...
async uploadFile() {
try {
    var params = {
      Bucket: <BucketName>,
      Key: <KeyName>,
      Body: <File Stream>
    };
    const res = await uploadToS3Async(params);
    console.log(res);
  } catch (error) {
    console.log(error);
  }
}

现在，当我在某些事件上调用 uploadFile 函数时，它会产生以下错误：

TypeError: service.getSignatureVersion is not a function
    at ManagedUpload.bindServiceObject  
    at ManagedUpload.configure 
    at new ManagedUpload  
    at upload   
    at new Promise (<anonymous>)

Answer 1

您不需要使用 es6-promisify

你可以这样做：

try {
  const params = {Bucket: 'bucket', Key: 'key', Body: stream};  
  const data = await s3.upload(params).promise();
  console.log(data);
}
catch (err) {
  console.log(err);
}

https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/using-promises.html

Answer 2

如果你想把它变成Promisify，那么你可以这样简单地实现

aws.js

const params = {
    Bucket: 'bucket',
    Key: 'key',
    Body: stream
};

const awsService = {};

awaService.upload = () => {
    return new Promise((resolve, reject) => {
        s3.upload(params, function(err, data) {
            if (err) {
                return reject(err);
            }
            return resolve(data);
        });
    });
};

module.exports = awsService;

在另一个文件上就这样调用

util.js

const awsService = require('./awsService');

const utils = {};

utils.upload = async () => {
    try {
        const result = await awsService.upload();
        return result;
    } catch (err) {
        console.log(err);
        throw err;
    }
};

module.exports = utils;

使用 Promisify 从回调转换为 Async-Await 格式后，AWS S3 上传不起作用

AWS S3 upload not working after converting from callback to Async-Await format using Promisify

javascript

amazon-s3

amazon-web-services

promise

aws-sdk