Hey all Wondering if anyone can help advise on this scenario Pulumi Community #general

Hey all, Wondering if anyone can help advise on t...

gray-knife-50817

09/19/2023, 3:19 PM

Hey all, Wondering if anyone can help advise on this scenario: Objective: Use an

Output

from

project A/stack A

project B/stack B

project C/stack C

in multiple files as inputs to resources (keeping things DRY) Current Setup: • Function declared in

which uses

StackReference

to get an

Output

from

(seems odd to use
StackReference
for the current stack but is there a better way?) • Files in

and

import the function from

and save the

Output

to a variable • The variable gets passed as input for creating resources in

and

• The CI pipeline runs a

preview

on all stacks (

etc) and fails on

because it doesn't recognise the variable which is dependent on the

Output

from

, since

hasn't had an

up

yet to actually produce the

Output

Am I missing something here in terms of the dependency? Happy to provide more context if helpful. Thanks in advance ✌️

billowy-army-68599

09/19/2023, 3:20 PM

Are Stack A, B and C from the same Pulumi project?

gray-knife-50817

09/19/2023, 3:23 PM

good question, I should've clarified that - they're each in separate projects. we're using a module approach within the organisation. I'll update the post!

billowy-army-68599

09/19/2023, 3:25 PM

So in stack A, wouldn’t you just export an output, then reference it in Stack B and Stack C as a stack reference?

billowy-army-68599

09/19/2023, 3:26 PM

which language SDK are you using?

gray-knife-50817

09/19/2023, 3:29 PM

using Python. the thinking was I didn't want to repeat the same code writing the

StackReference

in multiple places to get the same

Output

so my logic was to create a function in the module where it came from, to be reused in multiple places elsewhere

billowy-army-68599

09/19/2023, 3:36 PM

Generally that’s a 1 line code, but I will often abstract that away into a class, something like this:

Copy code

class VpcStackInfo(pulumi.StackReference):
    vpc_id = pulumi.Output[Any]
    private_subnet_ids = pulumi.Output[Any]
    public_subnet_ids = pulumi.Output[Any]
    cidr_block = pulumi.Output[Any]

    def __init__(self, stack_name: str):
        super().__init__(f"ignistech/vpc/{stack_name}")

        self.vpc_id = self.require_output("vpc_id")  # type: ignore
        self.private_subnet_ids = self.require_output("private_subnet_ids")  # type: ignore
        self.public_subnet_ids = self.require_output("public_subnet_ids")  # type: ignore
        self.cidr_block = self.require_output("cidr_block")  # type: ignore

Then reference it like this:

Copy code

vpc = stackinfo.VpcStackInfo(STACK)

billowy-army-68599

09/19/2023, 3:36 PM

I really try not to use cross referenced functions, you run into lots of issues that way

gray-knife-50817

09/19/2023, 4:00 PM

thanks for your help and suggestions I'll give that a go!

gray-knife-50817

09/20/2023, 11:02 AM

I've used the class approach and I think it's better, thanks! the

preview

is still failing for

because

hasn't been

up

'd yet I think. But all the changes are going together in the pipeline. Is there something I'm missing for dependency on

that needs to be declared for the

preview

to work?

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