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# general
e

eager-area-86739

11/25/2018, 6:52 PM
Hi, After resolving the previous problem, I'm running into another (perhaps my knowledge of Javascript is not up to pair). I have a stack that reads a resource that was already created, such as:
Copy code
const theQueue = aws.sqs.getQueue({
        name: "the-queue"
    });
exports.QueueArn = theQueue.arn.apply(arn => arn);
However, the const
theQueue
is empty. What I'm doing wrong? Thanks
b

big-piano-35669

11/25/2018, 11:21 PM
The
aws.sqs.getQueue
function returns a
Promise<GetQueueResult>
(https://github.com/pulumi/pulumi-aws/blob/cfcf3ed0c7019484ffc2a62de4498e41d802ee71/sdk/nodejs/sqs/getQueue.ts#L12). In JavaScript, you would need to somehow rendezvous with the promise's result, as it is produced asynchronously, either using the new
await
syntax if you're on a newer Node.js or TypeScript (https://www.typescriptlang.org/docs/handbook/release-notes/typescript-1-7.html), or use the
then
function to retrieve it (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then). For instance
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exports.QueueArn = theQueue.then(q => q.arn);
Note here that
QueueArn
will itself be a promise. An alternative way to accomplish this same thing is to use the static function
aws.sqs.Queue.get
, in which case the code you wrote will work almost exactly as-is:
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const theQueue = aws.sqs.Queue.get("the-queue");
exports.QueueArn = theQueue.arn;
It's unfortunate there are two ways to do this same thing, however in many cases the functions offer slightly different functionality -- in this case, they are virtually identical.
e

eager-area-86739

11/26/2018, 8:48 AM
Thanks. Spotted my problem. When using
then
I was trying to return the object! Cheers
👍 1