Convert dummy example into a concrete example

[heitorlessa]

Ideas to pick from when time allows:

• [ ] Simple TODO API
• [ ] Guestbook
• [ ] Simple ATM

[kbakk]

A few examples on things I find difficult which I think can help others:

• Multiple Lambda functions (could be an idea to show how to use two different functions in the same module, as well as two completely standalone modules)
• Some shared library that all functions uses (showcasing layers)
• Lambda function with additional modules (in app.py e.g. from my_module import my_func)

[heitorlessa]

hey @kbakk thank you so much for that. Now that Powertools has a Router functionality, @michaelbrewer and I have been discussing revamping this with two options: Monolithic and Micro function - both with shared and Lambda Layer (build optimization + dev dependency).

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

The monolithic option would take an hour to add since we already have a good project structure that works in both PyCharm and VSCode. The latter requires an additional CLI (e.g. PyInvoke) to support building separate functions while supporting relative and absolute imports, since SAM CLI discards the top level directory - the latter also needs additional cycles to ensure C bindings are built within a Docker Container.

[kbakk]

You may want to look into Poetry. I'm experimenting with this currently:

[tool.poetry]
# ...
packages = [
    { include = "my_app_dir", from = "functions/my_app_dir" },
    { include = "tests" }
]

This creates a .pth in the site-packages folder, I believe this is similar to modifying PYTHONPATH (for the local dev-environment).

cat $(poetry env info -p)/lib/python3.9/site-packages/my_project.pth
~/Code/my_project
~/Code/my_project/functions/my_app_dir

My handler is in functions/my_app_dir/my_app_dir/lambda_handler. The double-dir is to be able to say import my_app_dir.sub_module in the Lambda handler.

  MyLogicFn:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: functions/my_app_dir
      Handler: my_app_dir.lambda_handler.create_asset

[heitorlessa]

Definitely - we use Poetry for Lambda Powertools and don’t look back.

On Tue, 30 Nov 2021 at 18:59, Kristoffer Bakkejord @.***> wrote:

You may want to look into Poetry. I'm experimenting with this currently:

[tool.poetry]# ...packages = [ { include = "my_app_dir", from = "functions/my_app_dir" }, { include = "tests" } ]

This creates a .pth in the site-packages folder, I believe this is similar to modifying PYTHONPATH (for the local dev-environment).

cat $(poetry env info -p)/lib/python3.9/site-packages/my_project.pth ~/Code/my_project ~/Code/my_project/functions/my_app_parent

My handler is in functions/my_app_dir/my_app_dir/lambda_handler. The double-dir is to be able to say import my_app_dir.sub_module in the Lambda handler.

MyLogicFn: Type: AWS::Serverless::Function Properties: CodeUri: functions/my_app_dir Handler: my_app_dir.lambda_handler.create_asset

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[marcellodesales]

Hi @heitorlessa, do you have any update on this? I'd like to see both approaches you described at your comments...

hey @kbakk thank you so much for that. Now that Powertools has a Router functionality, @michaelbrewer and I have been discussing revamping this with two options: Monolithic and Micro function - both with shared and Lambda Layer (build optimization + dev dependency).

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

The monolithic option would take an hour to add since we already have a good project structure that works in both PyCharm and VSCode. The latter requires an additional CLI (e.g. PyInvoke) to support building separate functions while supporting relative and absolute imports, since SAM CLI discards the top level directory - the latter also needs additional cycles to ensure C bindings are built within a Docker Container.