如何在 nodeJS 中获取 AWS SQS 队列 ARN？

Question

I'm trying to build an application with a basic client-server infrastructure. The server infrastructure is hosted on AWS, and when a client logs on, it sends a message to the server to set up various infrastructure considerations. One of the pieces of infrastructure is an SQS Queue that the client can poll from to get updates from the server (eventually I'd like to build a push service but I don't know how for right now).

I'm building this application in NodeJS using the Node AWS SDK. The problem I'm having is I need the queue ARN to do various things like subscribe the SQS queue to an SNS topic that the application uses, but the create queue API returns the queue URL, not ARN. So I can get the ARN from the URL using the getQueueAttributes API, but it doesn't seem to be working. Whenever I call it, I get undefined as the response. Here's my code, please tell me what I'm doing wrong:

exports.handler = (event, context, callback) => {

    new aws.SQS({apiVersion: '2012-11-05'}).createQueue({
            QueueName: event.userId
        }).promise()
    )
    .then(data => { /* This has the Queue URL */
        new aws.SQS({apiVersion: '2012-11-05'}).getQueueAttributes({
            QueueUrl: data.QueueUrl,
            AttributeNames: ['QueueArn']
        }).promise()
    })
    .then(data => {
        console.log(JSON.stringify(data)); /* prints "undefined" */
    })
/* Some more code down here that's irrelevant */
}

Thanks!

Answer 1

const AWS = require('aws-sdk');
const sqs = new AWS.SQS();

exports.handler = async(event, context, callback) => {

    var params = {
        QueueUrl: 'my-queue-url',
        AttributeNames: ['QueueArn']
    };

    let fo = await sqs.getQueueAttributes(params).promise();
    console.log(fo);
};

它打印了

{
    ResponseMetadata: { RequestId: '123456-1234-1234-1234-12345' },
    Attributes: {
        QueueArn: 'arn:aws:sqs:eu-west-1:12345:my-queue-name'
    }
}

Answer 2

在 Ersoy 的帮助下，我意识到我正在使用块格式（使用 {}）来编写 Promise，但我从未从这些块中返回任何内容。我原本以为Promise块中的最后一个值是默认的返回值，但似乎并非如此。当我return在 SQS API 命令之前添加时，它就起作用了（不使用 async/await）。