template.yaml

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

  Sample SAM Template for sam-app

Globals:
  Function:
    Timeout: 30

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python3.7
      Events:
        HelloWorld:
          Type: Api
          Properties:
            Path: /hello
            Method: any

# Instructs your function is published to an alias named "live".
      AutoPublishAlias: live
# Grants this function permission to call lambda:InvokeFunction
      Policies:
        - Version: "2012-10-17"
          Statement:
          - Effect: "Allow"
            Action:
              - "lambda:InvokeFunction"
              - "s3:*"
            Resource: '*'
      DeploymentPreference:
          Hooks:
            PreTraffic: !Ref preTrafficHook
# Specifies the deployment configuration
          Type: AllAtOnce


  preTrafficHook:
    Type: AWS::Serverless::Function
    Properties:
      Handler: preTrafficHook.lambda_handler
      Policies:
        - Version: "2012-10-17"
          Statement:
          - Effect: "Allow"
            Action:
              - "codedeploy:PutLifecycleEventHookExecutionStatus"
            Resource:
              !Sub 'arn:aws:codedeploy:${AWS::Region}:${AWS::AccountId}:deploymentgroup:${ServerlessDeploymentApplication}/*'
        - Version: "2012-10-17"
          Statement:
          - Effect: "Allow"
            Action:
              - "lambda:InvokeFunction"
            Resource: !Ref HelloWorldFunction.Version
      Runtime: python3.7
      FunctionName: 'CodeDeployHook_preTrafficHook'
      DeploymentPreference:
        Enabled: false
      Timeout: 5
      Environment:
        Variables:
          NewVersion: !Ref HelloWorldFunction.Version


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
  HelloWorldFunctionIamRole:
    Description: "Implicit IAM Role created for Hello World function"
    Value: !GetAtt HelloWorldFunctionRole.Arn