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I am working in PyCharm with the AWS SAM and AWS SAM CLI modules. I am trying to setup a simple program:

  1. An Amazon Lambda layer for "ROCFacade"
  2. ROCFacade will import Python's standard requests module. After installing it with PIP, I copied it from the External Libraries/python3.8/site-packages folder (third box) to the lambda-layers subfolder in the second box.
  3. I am trying to call it from hello-world/app.py which so far is little more than the boilerplate installed by AWS SAM

When I try to run it, PyCharm reports that the ROCFacade module cannot be found.

Folder structure

The error message occurs if I ran it with an "app" configuration or with the Lambda configuration, below.

I have another project that uses the same ROCFacade with a simple main.py console app so the code does work. I'm not sure if my problem here is with environment variables (i.e., Python doesn't know to look in the lambda-layers folder) or the Pythong app/Lambda configuration. I am a newbie to both Python and Lambda/AWS development.

Thank you

Lambda error message

Lambda configuration

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I found my oversight. In the template.yaml the dev needs to add a reference to the layer in the function descriptor and define the layer.

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python3.8
      Layers: !Ref ROCFacadeLayer
      Events:
        HelloWorld:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /hello
            Method: get

ROCFacadeLayer:
  Type: AWS::Serverless::LayerVersion
  Properties:
    LayerName: ROCFacadeLayer
    ContentUri: lambda-layers/roc-facade-layer.zip
    CompatibleRuntimes:
      - python3.7
      - python3.8
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