Hi Is there a solution to use ```const elb = aws elb getLoad Pulumi Community #aws

Hi, Is there a solution to use ```const elb = aws...

bumpy-laptop-30846

04/22/2021, 1:10 PM

Hi, Is there a solution to use

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const elb =  aws.elb.getLoadBalancer( { name: elbName });

with elbName being an output. Is there a way around? Otherwise I don’t see how to address my use case, which I don’t develop here…

witty-candle-66007

04/22/2021, 1:29 PM

I’m not sure I’m following your question. Do you mean

elbName

is an output property of another resource and you want to use it in the

getLoadBalancer

call?

bumpy-laptop-30846

04/22/2021, 1:30 PM

yes, that’s actually my question 🙂

witty-candle-66007

04/22/2021, 1:30 PM

If so,

.apply()

is your friend: https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#apply So it’ll be something like

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const elb = otherResource.elbName.apply(elbName => aws.elb.getLoadBalancer({name: elbName})

bumpy-laptop-30846

04/22/2021, 1:31 PM

that’s what I did but I get a side effect

bumpy-laptop-30846

04/22/2021, 1:32 PM

It seems to be linked to this: (from the doc) During some program executions,

apply

doesn’t run. For example, it won’t run during a preview, when resource output values may be unknown. Therefore, you should avoid side-effects within the callbacks. For this reason, you should not allocate new resources inside of your callbacks either, as it could lead to

pulumi preview

being wrong.

witty-candle-66007

04/22/2021, 1:54 PM

Yes, that’s true, but since you are only doing a

get

in this block it shouldn’t matter. That said, what is the other resource from which you are getting the

elbName

. I’m wondering why you need to do the

getLoadBalancer

in this use-case.

bumpy-laptop-30846

04/22/2021, 2:01 PM

I get it from an helm ressourceProperty. It’s actually the name of a kubernetes service LB which has the name of the elb

witty-candle-66007

04/22/2021, 2:05 PM

Ahh. So, I guess I go back to my original thought that since it’s a

get

function it should be fine to use the

.apply()

logic in this case. Is it actually causing issues for your deployment?

bumpy-laptop-30846

04/22/2021, 2:12 PM

yes but the issue might not come from there. I also find strange that

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aws.route53.getZone( { name: 'xxxx' } )

returns a promise rather than a pulumi output. is it ok to use ‘then’ to get a value as with ‘apply’ in this case?

witty-candle-66007

04/22/2021, 2:17 PM

yes

bumpy-laptop-30846

04/22/2021, 2:26 PM

thank you for the info!

little-cartoon-10569

04/22/2021, 8:29 PM

You might not need to use apply or then in these cases. You can wrap Promises in Outputs (e.g.

const elb =  aws.elb.getLoadBalancer( { name: elbName });

, which allows Pulumi to do its magic lifting thing to access properties (e.g.

const newResource = new YourResource(name, { loadBalancerArn: elb.arn, ... });

little-cartoon-10569

04/22/2021, 8:30 PM

This only works when you're passing the promise-wrapped-in-an-output to a Pulumi constructor, but that is the most common use case, so it's often helpful.

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