[英]Reading multiple files and uploading to AWS S3
要求:
我的快遞服務器上的一個文件夾中有多個文件。 我將這些文件名作為 API 調用傳遞,后端函數需要讀取所有這些文件,將它們上傳到 AWS S3,然后返回一組公共 URL。
const s3 = new aws.S3();
const fs = require("fs");
module.exports = {
upload: async function (req, res, next) {
console.log("Inside upload controller");
let publicUrls = [];
const result = await Promise.all(
req.body.files.map(async (uploadFile) => {
fs.promises.readFile(uploadFile).then((file) => {
let body = fs.createReadStream(uploadFile);
const s3PutParams = {
Bucket: process.env.S3_BUCKET_NAME,
Key: uploadFile.substr(15),
Body: body,
ACL: "public-read",
};
s3.upload(s3PutParams)
.promise()
.then((response) => {
console.log(response.Location);
publicUrls.push(response.Location);
});
});
})
);
if (result) {
console.log("Result", result);
res.json(publicUrls);
}
},
};
觀察到的輸出:
Inside upload controller
Result [ undefined, undefined, undefined, undefined ]
https://xxx.s3.amazonaws.com/2_30062022.pdf
https://xxx.s3.amazonaws.com/1_30062022.pdf
https://xxx.s3.amazonaws.com/1_30062022.pdf
https://xxx.s3.amazonaws.com/2_30062022.pdf
我正在傳遞一個包含 4 個文件名的數組,因此在記錄“結果”時有 4 個“未定義”
問題:代碼沒有等待 Promise.all 完成。 它立即返回 json 響應,此時它是一個空數組。
如何解決?
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