如何使用 aws-sdk v3 从 S3 保存文件 [英] How to save file from S3 using aws-sdk v3

问题描述

使用新的 aws-sdk v3，特别是 @aws-sdk/client-s3，我不清楚如何将文件从 S3 存储到磁盘.
有以下代码

With the new aws-sdk v3, specifically @aws-sdk/client-s3, it's not clear to me how to store files to disk from S3.
Having the following code

const { Body } = await s3.send(new GetObjectCommand({
  Bucket: 'myBucket',
  Key: 'myKey',
}))

Body 可以是 Readable | 类型可读流 |Blob.
我想将它存储到磁盘上的文件中.由于返回类型完全不同，是否有一种简单的方法可以例如从 aws-sdk 获取 Buffer 或 Stream.Readable?

在 aws-sdk v2 中，使用 .createReadStream() 函数很容易，该函数似乎不再存在.

In aws-sdk v2 it was easy with .createReadStream() function which seems to no longer exist.

推荐答案

出现ReadableStream |博客 仅在浏览器中可用.Node.js 总是获得 Readable 这正是我所需要的.

It appears ReadableStream | Blog is available only in browser. Node.js always gets Readable which is what I need.

使用 fs.createWriteStream 和管道 Readable 之后的解决方案非常简单，例如

The solution is pretty straightforward afterwards with fs.createWriteStream and piping the Readable such as

await new Promise((resolve, reject) => {
  Body.pipe(fs.createWriteStream(filePath))
    .on('error', err => reject(err))
    .on('close', () => resolve())
})

作为参考，这里有一个讨论文档改进的问题 https://github.com/aws/aws-sdk-js-v3/issues/1877

For reference, here's an issue where improvement to documentation is discussed https://github.com/aws/aws-sdk-js-v3/issues/1877

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