AWSTemplateFormatVersion: '2010-09-09'
Description: AWS Step Functions sample project for error handling
Resources:
  ErrorHandlingStateMachineWithRetry:
    Type: 'AWS::StepFunctions::StateMachine'
    Properties:
      DefinitionString: !Sub |
        {
          "Comment": "A state machine calling an AWS Lambda function with Retry",
          "StartAt": "StartExecution",
          "States": {
            "StartExecution": {
              "Type": "Task",
              "Resource": "arn:aws:lambda:us-east-1:123456789012:function:FailFunction",
              "End": true
            }
          }
        }
      RoleArn: !GetAtt [StatesExecutionRole, Arn]
  ErrorHandlingStateMachineWithCatch:
    Type: 'AWS::StepFunctions::StateMachine'
    Properties:
      DefinitionString: !Sub |
        {
          "Comment": "A state machine calling an AWS Lambda function with Catch",
          "StartAt": "StartExecution",
          "States": {
            "StartExecution": {
              "Type": "Task",
              "Resource": "arn:aws:lambda:us-east-1:123456789012:function:FailureFunction",
              "TimeoutSeconds": 5,
              "Catch": [ {
                "ErrorEquals": ["CustomError"],
                "Next": "CustomErrorFallback"
              }, {
                "ErrorEquals": ["States.Timeout"],
                "Next": "TimeoutFallback"
              }, {
                "ErrorEquals": ["States.ALL"],
                "Next": "CatchAllFallback"
              } ],
              "End": true
            },
            "CustomErrorFallback": {
              "Type": "Pass",
              "Result": "This is a fallback from a custom Lambda function exception",
              "End": true
            },
            "TimeoutFallback": {
              "Type": "Pass",
              "Result": "This is a fallback from a timeout error",
              "End": true
            },
            "CatchAllFallback": {
              "Type": "Pass",
              "Result": "This is a fallback from any error",
              "End": true
            }
          } 
        }

      RoleArn: !GetAtt [StatesExecutionRole, Arn]
  StatesExecutionRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: 'Allow'
            Principal:
              Service: states.amazonaws.com
            Action: 'sts:AssumeRole'
      Policies:
        - PolicyName: StepFunctionsIamRoleInvokeLambda
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action: 'lambda:InvokeFunction'
                Resource: '*'

  ErrorHandlingCustomErrorFunction:
    Type: 'AWS::Lambda::Function'
    Properties:
      Handler: 'index.lambda_handler'
      Role: !GetAtt [LambdaExecutionRole, Arn]
      Code:
        ZipFile: !Sub |
          /**
            Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
            SPDX-License-Identifier: MIT-0
            
            Permission is hereby granted, free of charge, to any person obtaining a copy of this
            software and associated documentation files (the "Software"), to deal in the Software
            without restriction, including without limitation the rights to use, copy, modify,
            merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
            permit persons to whom the Software is furnished to do so.
            
            THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
            INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
            PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
            HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
            OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
            SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
          */
          exports.lambda_handler = async (event, context, callback) => {
            
            function FooError(message) {
              this.name = 'CustomError';
              this.message = message;
            }
            FooError.prototype = new Error();

            throw new FooError('This is a custom error!');
          };
      Runtime: 'nodejs12.x'
      Timeout: '11'
      FunctionName: 'ErrorHandlingCustomErrorFunction'

  ErrorHandlingSleep10Function:
    Type: 'AWS::Lambda::Function'
    Properties:
      Handler: 'index.lambda_handler'
      Role: !GetAtt [LambdaExecutionRole, Arn]
      Code:
        ZipFile: !Sub |
          /**
            Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
            SPDX-License-Identifier: MIT-0
            
            Permission is hereby granted, free of charge, to any person obtaining a copy of this
            software and associated documentation files (the "Software"), to deal in the Software
            without restriction, including without limitation the rights to use, copy, modify,
            merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
            permit persons to whom the Software is furnished to do so.
            
            THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
            INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
            PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
            HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
            OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
            SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
          */
          exports.lambda_handler = (event, context, callback) => {
            setTimeout(function(){}, 10000); // sleep for 10 seconds
          };
      Runtime: 'nodejs12.x'
      Timeout: '11'
      FunctionName: 'ErrorHandlingSleep10Function'

  LambdaExecutionRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: 'sts:AssumeRole'

Outputs:
  StateMachineArnWithRetry:
    Value:
      Ref: ErrorHandlingStateMachineWithRetry
  StateMachineArnWithCatch:
    Value:
      Ref: ErrorHandlingStateMachineWithCatch