[英]Uploading an audio file using Node.js Streams in AWS Lambda
因此,我嘗試從s3檢索mp3音頻文件(大約9 MB),將數據通過管道傳輸到寫入流,然后使用來自/ tmp /文件的readStream上載到另一個目標s3存儲桶。 這是一個lambda函數,它接收s3上傳事件,並嘗試將數據從創建的對象寫入另一個存儲桶。
const fs = require('fs');
const AWS = require('aws-sdk');
const s3 = new AWS.S3();
exports.handler = (event, context, callback) => {
var sourceBucket = event.Records[0].s3.bucket.name;
var sourceKey = event.Records[0].s3.object.key;
var getParams = {
Bucket: sourceBucket,
Key: sourceKey
};
const inputFilename = '/tmp/' + sourceKey;
//writing and reading streams
const writeStream = fs.createWriteStream(inputFilename);
s3.getObject(getParams).createReadStream().pipe(writeStream);
var putParams = {
Body: fs.createReadStream(inputFilename),
Bucket: "example-destination-bucket",
Key: 'transfer-' + sourceKey
};
s3.upload(putParams, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else console.log('logging data' + data); // successful response
});
};
這樣可以將密鑰成功放入s3存儲桶,但上傳的文件大小為0字節。 知道為什么這會導致上傳為空嗎?
該文件需要下載,這需要一些時間,因此您需要使用file.on('finish')這樣的調用。
const writeStream = fs.createWriteStream(inputFilename);
s3.getObject(getParams).createReadStream().pipe(writeStream);
writeStream.on('finish', function() {
//upload to S3 code
}
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