我必须将文件从 API 端点传输到两个不同的存储桶。原始上传是使用:
curl -X PUT -F "data=@sample" "http://localhost:3000/upload/1/1"
上传文件的端点:
const PassThrough = require('stream').PassThrough;
async function uploadFile (req, res) {
try {
const firstS3Stream = new PassThrough();
const secondS3Stream = new PassThrough();
req.pipe(firstS3Stream);
req.pipe(secondS3Stream);
await Promise.all([
uploadToFirstS3(firstS3Stream),
uploadToSecondS3(secondS3Stream),
]);
return res.end();
} catch (err) {
console.log(err)
return res.status(500).send({ error: 'Unexpected error during file upload' });
}
}
如您所见,我使用了两个PassThrough流,以便将请求流复制到两个可读流中,正如此 SO thread 中所建议的那样。
这段代码保持不变,这里有趣的是uploadToFirstS3
anduploadToSecondS3
函数。在这个最小的例子中,两者都使用不同的配置做完全相同的事情,我将在这里只使用一个。
什么效果好:
const aws = require('aws-sdk');
const s3 = new aws.S3({
accessKeyId: S3_API_KEY,
secretAccessKey: S3_API_SECRET,
region: S3_REGION,
signatureVersion: 'v4',
});
const uploadToFirstS3 = (stream) => (new Promise((resolve, reject) => {
const uploadParams = {
Bucket: S3_BUCKET_NAME,
Key: 'some-key',
Body: stream,
};
s3.upload(uploadParams, (err) => {
if (err) reject(err);
resolve(true);
});
}));
这段代码(基于aws-sdk包)工作正常。我的问题是我希望它与@aws-sdk/client-s3包一起运行,以减小项目的大小。
什么不起作用:
我首先尝试使用S3Client.send(PutObjectCommand):
const { S3Client, PutObjectCommand } = require('@aws-sdk/client-s3');
const s3 = new S3Client({
credentials: {
accessKeyId: S3_API_KEY,
secretAccessKey: S3_API_SECRET,
},
region: S3_REGION,
signatureVersion: 'v4',
});
const uploadToFirstS3 = (stream) => (new Promise((resolve, reject) => {
const uploadParams = {
Bucket: S3_BUCKET_NAME,
Key:'some-key',
Body: stream,
};
s3.send(new PutObjectCommand(uploadParams), (err) => {
if (err) reject(err);
resolve(true);
});
}));
然后我尝试了 S3.putObject(PutObjectCommandInput):
const { S3 } = require('@aws-sdk/client-s3');
const s3 = new S3({
credentials: {
accessKeyId: S3_API_KEY,
secretAccessKey: S3_API_SECRET,
},
region: S3_REGION,
signatureVersion: 'v4',
});
const uploadToFirstS3 = (stream) => (new Promise((resolve, reject) => {
const uploadParams = {
Bucket: S3_BUCKET_NAME,
Key:'some-key',
Body: stream,
};
s3.putObject(uploadParams, (err) => {
if (err) reject(err);
resolve(true);
});
}));
最后两个示例都给了我一个501-Not Implemented错误的标题Transfer-Encoding
。我检查了一下req.headers
,里面没有Transfer-Encoding
,所以我猜是 sdk 在请求中添加了 s3 ?
由于第一个示例(基于aws-sdk)工作正常,我确信错误不是由于请求中的空正文,如此 SO thread中所建议的那样。
尽管如此,我认为触发上传时流可能还不可读,因此我将调用uploadToFirstS3
和事件uploadToSecondS3
触发的回调包装起来req.on('readable', callback)
,但没有任何改变。
我想随时处理内存中的文件而不将其存储在磁盘上。有没有办法使用@aws-sdk/client-s3包来实现它?