template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: SAM Template for apigw-lambda-layer

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
      Runtime: python3.9
      Timeout: 30
      Architectures:
        - arm64
        
Resources:

  # More info about Layers: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-layers.html
  LambdaLayerCode:
    Type: 'AWS::Serverless::LayerVersion'
    Properties:
      CompatibleRuntimes:
        - python3.9
      ContentUri: src/sampleCodeLayer
      Description: Common code layer
      LayerName: !Sub "${AWS::StackName}-CodeLayer"
      
  LambdaLayerSchema:
    Type: 'AWS::Serverless::LayerVersion'
    Properties:
      CompatibleRuntimes:
        - python3.9
      ContentUri: src/sampleSchemaLayer
      Description: Common schema (API contract) layer
      LayerName: !Sub "${AWS::StackName}-SchemaLayer"    

  PythonTestDemo:
    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:
      Tracing: Active
      CodeUri: src/sampleLambda
      Handler: app.lambda_handler
      Layers:
        - !Ref LambdaLayerCode
        - !Ref LambdaLayerSchema
      Policies:
      - AWSXrayWriteOnlyAccess
      - Version: '2012-10-17' # Policy Document
        Statement:
          - Effect: Allow
            Action:
              - s3:ListAllMyBuckets
            Resource: 'arn:aws:s3:::*'
      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/lambda/layers
            Method: get

Outputs:
  # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function
  # Find out more about other implicit resources you can reference within SAM
  # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api
  HelloWorldApi:
    Description: "API Gateway endpoint URL for Prod stage for Hello World function"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/lambda/layers/"
  PythonTestDemo:
    Description: "Hello World Lambda Function ARN"
    Value: !GetAtt PythonTestDemo.Arn
  PythonTestDemoIamRole:
    Description: "Implicit IAM Role created for Hello World function"
    Value: !GetAtt PythonTestDemoRole.Arn