How do I get the AccountId as a variable in a serverless.yml file?

Question

I want to build an ARN in my file dynamically, but I need to get my current AccountId. How can I access it as a variable?

For example:

example: arn:aws:states:${region}:${accountId}:stateMachine:${self:service}-${self:custom.stage}-example

What is the proper way to reference the current region and accountId?

Answer 1

This is now supported natively in Serverless Framework.

functions example

  functions:
    hello:
      handler: my-function.handler
      environment:
        var: !Sub arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/*:*:*'

iam role example

  iam:
    role:
      statements:
        - Effect: Allow
          Action:
            - dynamodb:*
          Resource: !Sub arn:aws:dynamodb:${AWS::Region}:${AWS::AccountId}:table/${AWS::StackName}-*

See Pseudo Parameters Reference for the official docs.