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steep-lamp-20408

08/25/2022, 3:04 PM
Hey girls/guys, sorry for the stupid question but I have trouble to understand what Pulumi documentation means by the ID of a resource and thus how to get an existing AWS resource (say, a AWS DataSource, or a DynamoDB table, whatever) with Pulumi (in my case in Python). Pulumi documentation (https://www.pulumi.com/docs/intro/concepts/resources/get/) says the getter function should be provided the name of the resource (got that), but also the ID. What is the ID of the resource? I tried with the AWS ARN of the resource, but got a Pulumi error. Might be a stupid question but I’m stuck on this one for an hour!
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echoing-dinner-19531

08/25/2022, 3:08 PM
So it's normally the last part of the arn. So something with an arn like "arn:aws:ec2:us-west-2:616138583583:instance/i-092bcc5cbb92278c1" has an id of "i-092bcc5cbb92278c1".
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steep-lamp-20408

08/25/2022, 3:09 PM
Oh ok. Thanks. This is the only way the get the ID?
I mean, I have to know the ID? I cannot get a resource just from its name?
e

echoing-dinner-19531

08/25/2022, 3:10 PM
Currently you need the ID, we don't have a general search by other fields system yet.
l

limited-rainbow-51650

08/25/2022, 3:25 PM
@steep-lamp-20408 There is a difference between the 
get
function on any Resource class (which needs the id as @echoing-dinner-19531 described) and similar functions you see on the package level. In your case, you are more interested in 
aws.ec2.getInstance(…)
where you can pass a filter description. https://www.pulumi.com/registry/packages/aws/api-docs/ec2/getinstance/
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steep-lamp-20408

08/25/2022, 3:44 PM
Thanks @echoing-dinner-19531 and @limited-rainbow-51650
@limited-rainbow-51650 Although I need to get a DataSource and a DynamoDB table, according to the doc there is no 
.getInstance(...)
for AWS DataSources and DynamoDB tables Pulumi types. Right?
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limited-rainbow-51650

08/25/2022, 4:07 PM
The word 
instance
in 
getInstance
refers to an EC2 instance. This isn’t a function that returns you an instance of any resource type. E.g. for DynamoDB tables, you have a similar function in the 
aws.dynamodb
module: https://www.pulumi.com/registry/packages/aws/api-docs/dynamodb/gettable/ There seems to be more than one AWS product which has a type 
DataSource
. Which product are you using in this case?
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steep-lamp-20408

08/26/2022, 12:55 AM
@limited-rainbow-51650 Thanks. Great for DynamoDB, missed that! For 
DataSource
sorry I mean an AppSync DataSource, if that makes things more clear.
@limited-rainbow-51650 For Appsync DataSource I see a 
.get(...)
function but it seems it requires an ID: https://www.pulumi.com/registry/packages/aws/api-docs/appsync/datasource/
I couldn’t find any ARN or ID for AppSync DataSource in AWS.
In that case I might just recreate another DataSource and associate it with the same existing DynamoDB table.
I figured it out thanks to the help of @limited-rainbow-51650. If that can be of any help to someone else, this is how you get an existing AWS DynamoDB table from its name (in Python). You need to do it in two steps. The documentation is not clear on that and on what is an ID (blink to Pulumi’s team, would be great to improve the doc on that points) Here you are (I type-hinted the vars for more clarity): 
import pulumi_aws as aws


dynamodb_table_info: aws.dynamodb.get_table.AwaitableGetTableResult = aws.dynamodb.get_table(name="my-name")

dynamodb_table: aws.dynamodb.Table = aws.dynamodb.Table.get(resource_name=dynamodb_table_info.name, id=dynamodb_table_info.id)
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