template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  sam-test-ec

  Sample SAM Template for sam-test-ec

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 3

Resources:
  # CFDistribution:
  #   Type: AWS::CloudFront::Distribution
  #   Properties:
  #     DistributionConfig:
  #       Enabled: 'true'
  #       Comment: Lambda@Edge SAM Sample
  #       DefaultRootObject: index.html
  #       Origins:
  #         -
  #           Id: MyOrigin
  #           DomainName: aws.amazon.com # https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-cloudfront-distribution-origin.html
  #           CustomOriginConfig:
  #             HTTPPort: 80
  #             OriginProtocolPolicy: match-viewer
  #       DefaultCacheBehavior:
  #         TargetOriginId: MyOrigin
  #         # Lambda@Edge configuration requires a function version not alias
  #         LambdaFunctionAssociations:
  #           - 
  #             EventType: origin-request
  #             # <SAM-Function.Version> provides {FunctionARN}:{Version} which is exactly what Cloudfront expects
  #             # SAM Benefit here is upon function changes this function version will also be updated in Cloudfront
  #             LambdaFunctionARN: !Ref HelloWorldFunction.Version
  #         ForwardedValues:
  #           QueryString: 'false'
  #           Headers:
  #             - Origin
  #           Cookies:
  #             Forward: none
  #         ViewerProtocolPolicy: allow-all

  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
      Layers:
        - !Ref HelloWorldDepLayer
      Runtime: python3.7
      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
      AutoPublishAlias: live
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: "Allow"
            Action: "sts:AssumeRole"
            Principal:
              Service:
                - "lambda.amazonaws.com"
                - "edgelambda.amazonaws.com"
      DeploymentPreference:
        Type: Linear10PercentEvery1Minute 
        Alarms:
          # A list of alarms that you want to monitor
          - !Ref AliasErrorMetricGreaterThanZeroAlarm
          - !Ref LatestVersionErrorMetricGreaterThanZeroAlarm
        # Hooks:
          # Validation Lambda functions that are run before & after traffic shifting
          # PreTraffic: !Ref PreTrafficLambdaFunction
          # PostTraffic: !Ref PostTrafficLambdaFunction

  HelloWorldDepLayer:
    Type: AWS::Serverless::LayerVersion
    Properties:
      Description: Dependencies for sam app
      ContentUri: 'dependencies/'
      CompatibleRuntimes:
        - python3.7
    Metadata:
      BuildMethod: python3.7

  # CW Alarm to monitor the new Lambda version for errors
  AliasErrorMetricGreaterThanZeroAlarm:
    Type: AWS::CloudWatch::Alarm
    DependsOn: HelloWorldFunction
    Properties:
      AlarmName: !Sub sam-test-ec-AliasErrorMetricGreaterThanZeroAlarm-${HelloWorldFunction}
      AlarmDescription: "pre-deployment alarm to check for errors in the function"
      #AlarmActions:
      #  - !Ref AlarmTopic
      ComparisonOperator: GreaterThanOrEqualToThreshold
      Dimensions:
        - Name: FunctionName
          Value: !Ref HelloWorldFunction
      EvaluationPeriods: 1
      MetricName: Errors
      Namespace: AWS/Lambda
      Period: '60'
      Statistic: Sum
      Threshold: '1'

  # CW Alarm to monitor the new Lambda version for errors
  LatestVersionErrorMetricGreaterThanZeroAlarm:
    Type: AWS::CloudWatch::Alarm
    DependsOn: HelloWorldFunction
    Properties:
      AlarmName: !Sub sam-test-ec-LatestVersionErrorMetricGreaterThanZeroAlarm-${HelloWorldFunction}
      AlarmDescription: "pre-deployment alarm to check for errors in the function"
      #AlarmActions:
      #  - !Ref AlarmTopic
      ComparisonOperator: GreaterThanOrEqualToThreshold
      TreatMissingData: missing
      Dimensions:
        - Name: FunctionName
          Value: !Ref HelloWorldFunction
        - Name: Resource
          Value: !Join [":", [!Ref HelloWorldFunction, !Select ["7", !Split [":", !Ref HelloWorldFunction.Version]]]]
      EvaluationPeriods: 1
      MetricName: Errors
      Namespace: AWS/Lambda
      Period: '60'
      Statistic: Sum
      Threshold: '1'
        
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/"

  HelloWorldFunction:
    Description: "Hello World Lambda Function ARN"
    Value: !GetAtt HelloWorldFunction.Arn
  
  HelloWorldFunctionSampleVersion: 
    Description: Lambda@Edge Sample Function ARN with Version
    Value: !Ref HelloWorldFunction.Version

  HelloWorldFunctionIamRole:
    Description: "Implicit IAM Role created for Hello World function"
    Value: !GetAtt HelloWorldFunctionRole.Arn
  
  # CFDistribution: 
  #   Description: Cloudfront Distribution Domain Name
  #   Value: !GetAtt CFDistribution.DomainName