部署后获取更新的 AWS Lambda URL

Question

I have set up CI/CD for an AWS Lambda function such that the new version is automatically deployed using GitHub actions. By default, AWS creates a new Lambda ID (and thus URL) for this lambda function. This means that the front-end portion of my code will need to be updated to contain the updated URL. Is there a way to automatically perform such updating? By eg saving the URL as an environment variable and inserting it in the code with a GitHub action?

Or is there alternatively a way to re-use the old Lambda function URL for new deployments?

Answer 1

You can get the updated Lambda URL by using SAM template outputs as follows:

Resources:
  MyFunction:
    Type: 'AWS::Serverless::Function'

Outputs:
  MyFunctionUrlEndpoint:
    Description: "My Lambda Function URL Endpoint"
    Value: !GetAtt MyFunctionUrl.FunctionUrl

Then you can access the output as described in this answer :

aws cloudformation describe-stacks --stack-name stack_name --query 'Stacks[0].Outputs[?OutputKey==`MyFunctionUrlEndpoint`].OutputValue' --output text

which can then be further processed in eg your front-end code.

There may be easier methods, but this should work!