New Lambda Function URL capability; router functionality?

[rkulagowski]

https://aws.amazon.com/blogs/aws/announcing-aws-lambda-function-urls-built-in-https-endpoints-for-single-function-microservices/

If I'd like to migrate from API Gateway to direct invocation, can I use one of the router functions (decorators) to send various HTTP methods to the appropriate function in my monolith? I don't want to add Flask if I don't have to.

[michaelbrewer]

@rkulagowski - this already works via the APIGatewayHttpResolver

[michaelbrewer]

Otherwise there are 2 open issues to support this officially for data classes and the event handler:

• Feature request: Add Event Source Data Class for AWS Lambda Function URLs #1141
• Feature request: Add Event handler for AWS Lambda Function URLs #1142

[deric4]

ah nice! after reading your comments in #1141 and #1142 I realize where I incorrectly assumed this wasn't supported when playing around trying to implement a custom cloudfront origin using a lambda function url.

I hit this part of the docs first, and incorrectly concluded it wasn't supported

You must have an existing API Gateway Proxy integration or ALB configured to invoke your Lambda function. There is no additional permissions or dependencies required to use this utility.

https://awslabs.github.io/aws-lambda-powertools-python/latest/core/event_handler/api_gateway/#required-resources

I'm not sure how accurate my current mental model of there being an implicit API Gateway proxying traffic to my lambda is, but running all of my logged events through event_parser with APIGatewayProxyEventV2Model works 🥳

https://github.com/awslabs/aws-lambda-powertools-python/blob/c1955b87346010556645b59c0e934a12ed290beb/aws_lambda_powertools/utilities/parser/models/apigwv2.py#L59-L71

Thanks @michaelbrewer !

[heitorlessa]

We'll look into adding official support for Function URL as a new Resolver class after our pause - here's the feature request that we'd appreciate you giving a +1: #1142

In the meantime, Michael's answer should work. Function URL uses HTTP API payload v2 with minor/non-breaking changes.

Thank you everyone

[heitorlessa]

Closing as this was launched back then: https://docs.powertools.aws.dev/lambda/python/latest/core/event_handler/api_gateway/#lambda-function-url