AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  A Step Functions Standard Workflow that triggers a Lambda function synchronously which in turn triggers another function asynchronously.
Resources:
##########################################################################
#   STEP FUNCTION                                                        #
##########################################################################
  StateMachineStandardInvokeLambda:
    Type: AWS::Serverless::StateMachine
    DependsOn:
        - StatesExecutionRole
        - StateMachineLogGroup
    Properties:
      DefinitionUri: statemachine/StateMachine.asl.json
      DefinitionSubstitutions:
        FirstFunctionARN: !GetAtt FirstFunction.Arn
        SecondFunctionARN: !GetAtt SecondFunction.Arn
      Role:
        Fn::GetAtt: [ StatesExecutionRole, Arn ]
      Logging:
        Destinations:
          - CloudWatchLogsLogGroup:
              LogGroupArn: !GetAtt StateMachineLogGroup.Arn
        IncludeExecutionData: true
        Level: 'ALL'
##########################################################################
#  Lambda functions                                                      #
##########################################################################
  FirstFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: firstfunction/
      Handler: first-function.handler
      Runtime: nodejs16.x
      Timeout: 3
      Policies: 
        - CloudWatchPutMetricPolicy: {}
  SecondFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: secondfunction/
      Handler: second-function.handler
      Runtime: nodejs16.x
      Timeout: 3
      Policies: 
        - CloudWatchPutMetricPolicy: {}
##########################################################################
#  STEP FUNCTION LOG GROUP                                               #
##########################################################################
  StateMachineLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Join [ "/", [ "stepfunctions", StateMachineStandardInvokeLambda]]
##########################################################################
#   Roles                                                               #
##########################################################################
  StatesExecutionRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: "Allow"
            Principal:
              Service:
                - !Sub states.${AWS::Region}.amazonaws.com
            Action: "sts:AssumeRole"
      Path: "/"
      Policies:
        - PolicyName: LambdaExecute
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - "lambda:InvokeFunction"
                Resource: 
                  - !GetAtt FirstFunction.Arn
                  - !GetAtt SecondFunction.Arn
        -  PolicyName: LogPermissions
           PolicyDocument:
             Version: "2012-10-17"
             Statement:
              - Effect: Allow
                Action:
                  - "logs:CreateLogDelivery"
                  - "logs:GetLogDelivery"
                  - "logs:UpdateLogDelivery"
                  - "logs:DeleteLogDelivery"
                  - "logs:ListLogDeliveries"
                  - "logs:PutLogEvents"
                  - "logs:PutResourcePolicy"
                  - "logs:DescribeResourcePolicies"
                  - "logs:DescribeLogGroups"
                Resource: "*"                  
##########################################################################
#   Outputs                                                              #
##########################################################################
Outputs:
  StateMachineExpressSynctoLambda:
    Value: !Ref StateMachineStandardInvokeLambda
    Description: StateMachineStandardInvokeLambda Arn