AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: AWS Step Functions sample project for combining workflows using the Step Functions StartExecution API service integration in various patterns.
Globals:
  Function:
    Runtime: nodejs14.x
    CodeUri: "functions/"
Resources:
# Callback Lambda function
  NestingPatternCallbackLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: callback.lambda_handler
      Timeout: 25
      Policies:
      - AWSLambdaBasicExecutionRole 
      - Statement:
        - Sid: SendTaskSuccessPolicy
          Effect: Allow
          Action: 
            - "states:SendTaskSuccess"
          Resource: "*"

# IAM role for the state machines
  StateMachineExecRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: states.amazonaws.com
            Action: "sts:AssumeRole"
# Nested state machine
  NestingPatternAnotherStateMachine:
    Type: AWS::Serverless::StateMachine
    Properties:
      DefinitionUri: statemachines/nested-state-machine.asl.json
      DefinitionSubstitutions: 
        NestingPatternCallbackLambdaFunction: !GetAtt NestingPatternCallbackLambdaFunction.Arn
      Role: !GetAtt StateMachineExecRole.Arn
    Connectors:
      LambdaCallbackConnector:
        Properties:
          Destination:
            - Id: NestingPatternCallbackLambdaFunction
          Permissions:
            - Write

# Main state machine
  NestingPatternMainStateMachine:
    Type: AWS::Serverless::StateMachine
    Properties:
      DefinitionUri: statemachines/main-state-machine.asl.json
      DefinitionSubstitutions:
        NestingPatternAnotherStateMachineArn: !Ref NestingPatternAnotherStateMachine
      Role: !GetAtt StateMachineExecRole.Arn
    Connectors:
      NestedMachineRWAccessConnector:
        Properties:
          Destination:
            - Id: NestingPatternAnotherStateMachine
          Permissions:
            - Write
            - Read
      EventWriteAccessConnector:
        Properties:
          Destination:
            - Arn: !Sub arn:${AWS::Partition}:events:${AWS::Region}:${AWS::AccountId}:rule/StepFunctionsGetEventsForStepFunctionsExecutionRule
              Type: AWS::Events::EventBus
          Permissions:
          - Write
# Outputs 
Outputs:
  StateMachineArn:
    Value:
      Ref: NestingPatternMainStateMachine
  ExecutionInput:
    Description: Sample input to StartExecution.
    Value:
      >
        {}