Question

我正在尝试使用NodeJS将多个文件上传到Google Cloud Storage存储桶。我希望先上传所有文件，然后再继续。我尝试了几种方法，但似乎无法正确完成。

const jpegImages = await fs.readdir(jpegFolder);

console.log('start uploading');

await jpegImages.forEach(async fileName => {
    await bucket.upload(
        path.join(jpegFolder, fileName),
        {destination: fileName}
     ).then( () => {
         console.log(fileName + ' uploaded');
     })
})

console.log('finished uploading');

这给了我以下输出，这不是我期望的。为什么在上传文件后不执行“完成上传”日志？

start uploading
finished uploading
image1.jpeg uploaded
image2.jpeg uploaded
image3.jpeg uploaded

Answer 1

async / await不适用于forEach和其他数组方法。

如果您不需要顺序上传（可以并行上传文件），则可以创建一个Promises数组，并使用Promise.all()一次执行所有操作。

const jpegImages = await fs.readdir(jpegFolder);

console.log('start uploading');

await Promise
    .all(jpegImages.map(fileName => {
        return bucket.upload(path.join(jpegFolder, fileName), {destination: fileName})
    }))
    .then(() => {
        console.log('All images uploaded')
    })
    .catch(error => {
        console.error(`Error occured during images uploading: ${error}`);
    });

console.log('finished uploading');

异步上传多个文件到谷歌云存储桶

1 个答案: