[Solved] Get a AWS CF resource ID inside Lambda?

Serverless Framework
1

Hi,

I’m creating some resources on my serverless.yml with cloudformation.
Is it possible to get the IDs of those resources inside the lambdas so that I don’t need to hard-coded all the IDs of the resources created?

Thanks

2

You can reference cloudformation values like so https://github.com/DavidWells/serverless-workshop/blob/master/lessons-code-complete/events/dynamodb-streams/serverless.yml#L21 and pass them in an environment variables

more info here http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-getatt.html

1 Like
3

Thanks!

I’m trying to do this with a Cognito Identity Pool but I get the error:

/Resources/IamRoleLambdaExecution/Properties/Policies/0/PolicyDocument/Statement/2/Resource/0/Fn::Join/1/0/Fn::GetAtt: Resource type AWS::Cognito::IdentityPool does not support
attribute {Arn}.

This doesn’t work with a Cognito Identity Pool?

4

Ok, now it’s working.

What I did was:

  Resource:
    - 'Fn::Join':
      - ''
      -
        - 'arn:aws:cognito-sync:eu-west-2:1111111111:identitypool/'
        - Ref: CognitoIdentityPool
        - '/identity/*/dataset/*'

And for environment I did like you have:

provider:
  name: aws
  runtime: nodejs6.10
  stage: ${opt:stage, 'dev'}
  environment:
    IDENTITY_POOL_ID: { Ref: CognitoIdentityPool }

Thanks!

1 Like