(aws-lambda-python): bundling lambda code with platform-specific dependencies

[ivan-luska]

General Issue

Unable to correctly bundle lambda for ARM_64 architecture

The Question

Hello,

I tried to deploy & run lambda code with some platform-specific dependencies (having some C bindings, e.g. pyOpenSSL - https://pypi.org/project/pyOpenSSL/). It works fine for x86_64 architecture, but on ARM_64 the lambda is unable to run, because wrong dependencies were installed (those for x86_64 architecture). In the CDK code it looks like it selects the Docker container for bundling only based on runtime, not target architecture. The question is - Is this a bug or desired behaviour?

The documentation says:
If requirements.txt, Pipfile or poetry.lock exists at the entry path, the construct will handle installing all required modules in a Lambda compatible Docker container according to the runtime and with the Docker platform based on the target architecture of the Lambda function.

CDK CLI Version

2.9.0 (build a69725c)

Framework Version

CDK 1.147.0

Node.js Version

No response

OS

MacOS Big Sur

Language

Python

Language Version

Python 3.8.12

Other information

requirements.txt content:
pyopenssl

related lambda config in CDK:
runtime=Runtime.PYTHON_3_8, architecture=Architecture.ARM_64,

[ivan-luska]

Any feedback on this? Thanks.