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#python
Title
# python
l

limited-continent-1382

09/16/2022, 9:19 AM
Hello there, We know we can export values programmatically by using 
pulumi.export("ip", "0.0.0.0")
, but is there a way to get that exported value from that key using Python?
m

millions-furniture-75402

09/16/2022, 1:29 PM
I think you're asking about StackReferences
l

limited-continent-1382

09/16/2022, 1:32 PM
Thanks @millions-furniture-75402, If it's in the same stack, is this the way to go?
m

millions-furniture-75402

09/16/2022, 1:34 PM
If it's in the same stack, why wouldn't you already have the variable for use?
You can, but I don't think you should. There is a smell here. You should have a local variable that you're exporting as a stack output.
👍 1
l

limited-continent-1382

09/16/2022, 1:43 PM
In my script, I am creating a one resource that is dependent on the creation of another resource, and I want to pass the dependency resource's resource id as a parameter into the dependent resource creation. And also those resource creations are handled by various modules in my code base.
That's why I am looking for such a feature
s

stocky-restaurant-98004

09/17/2022, 9:53 PM
If you want to use the output of one resource as the input of another, that conversion happens automatically - you do not need to write any additional code to handle this.
l

limited-continent-1382

09/19/2022, 6:40 AM
Thanks @stocky-restaurant-98004, Okay, but I'm not sure how to tell the dependent job to use that exported value.
I'll explain my question little bit more. In my scripts, I have a python module that generates gcp taxonomies. In this function, I will export the taxonomy resource ID along with the known key for later use. In addition, I have another module that is used to generate policy tags for taxonomies. Consider the following scenario: I need to create a policy tag for a previously created taxonomy. As a result, I must pass the taxonomy resource id to that policy tag function. That can only be obtained from the outputs. Can you give me an example of how I can do it? I want to get the taxonomy resource id from the exported key programmatically to pass it into policy tag creation module.
s

stocky-restaurant-98004

09/19/2022, 12:43 PM
This is all within a single stack, correct?
l

limited-continent-1382

09/19/2022, 1:00 PM
Yes @stocky-restaurant-98004
s

stocky-restaurant-98004

09/19/2022, 1:01 PM
You can just return the values you need from one function to another.
pulumi.export
is for a stack output, which you'd either consume from the command line outside of Pulumi, or in another stack via a StackReference.
Pulumi itself will keep track of the dependencies with Inputs and Outputs.
l

limited-continent-1382

09/19/2022, 1:08 PM
I am not sure how I can mention those dependencies. Can you send me an example?
Time to time, I might have to provision different resources, sometime I might need to point previously created resource to new resource. In such a case, how can I use this Inputs and outputs?
s

stocky-restaurant-98004

09/19/2022, 1:13 PM
In this example:
Copy code
web_bucket = s3.Bucket('s3-website-bucket',
    website=s3.BucketWebsiteArgs(
        index_document="index.html",
    ))


content_dir = "www"
for file in os.listdir(content_dir):
    filepath = os.path.join(content_dir, file)
    mime_type, _ = mimetypes.guess_type(filepath)
    obj = s3.BucketObject(file,
        bucket=web_bucket.id,
        source=FileAsset(filepath),
        content_type=mime_type)
web_bucket.id
is an Output of 
aws.s3.Bucket
. It becomes the input of 
aws.S3.BucketObject
. This happens automatically. Pulumi figured out what needs to be created in what order.
l

limited-continent-1382

09/19/2022, 1:13 PM
For those provisions, scripts are running few times, so can't return a value from function to another
s

stocky-restaurant-98004

09/19/2022, 1:13 PM
Pulumi is declarative. If you run 
pulumi up
to completion, and run it again, it will not create anything new because it knows things are already in the state you declared.
l

limited-continent-1382

09/19/2022, 1:20 PM
Got it. Thanks a lot @stocky-restaurant-98004 for the support. Will try to resolve my problem based on ur valuable details
s

stocky-restaurant-98004

09/19/2022, 1:21 PM
Have you gone through any of our workshops? They might help. What cloud are you using?
🙏 1
l

limited-continent-1382

09/19/2022, 6:02 PM
Not yet, went through some YouTube tutorials and the Pulumi official docs
currently I am using GCP
s

stocky-restaurant-98004

09/19/2022, 6:12 PM
I'm working on a GCP Python tutorial that should be released shortly.
🙌 1
l

limited-continent-1382

09/19/2022, 6:41 PM
Great 🙏
Found an alternative way to get exported values for later use. 
resource_id = subprocess.run(['pulumi', 'stack', 'output', f'{exported_key_name}'], stdout=subprocess.PIPE).stdout.decode('utf-8').strip()
m

millions-furniture-75402

09/19/2022, 6:44 PM
that's a more fragile way of doing it than the automation api, fyi
l

limited-continent-1382

09/19/2022, 6:47 PM
yeah, it would be more preferable if we can enrich the pulumi library by adding a functionality to get those exported values.
m

millions-furniture-75402

09/19/2022, 6:48 PM
Right, that's stack references, or refactoring your code.
l

limited-continent-1382

09/19/2022, 6:49 PM
yeah, got it. couldn't try stack references, will try that also
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