AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Serverless patterns - Amazon API Gateway to AWS Lambda to Amazon QLDB

# Comment on each global 
Globals:

  # Enable X-Ray tracing on API Gateway and prevent default Stage being created
  Api:
    TracingEnabled: true
    OpenApiVersion: 3.0.1

  # Set default values for all Lambda functions
  Function:
    Tracing: Active
    Timeout: 6
    Environment:
      Variables:
        LEDGER_NAME: !Ref QldbLedger
        AWS_NODEJS_CONNECTION_REUSE_ENABLED: 1


Resources:

  # Create a new QLDB Ledger
  QldbLedger:
    Type: AWS::QLDB::Ledger
    Properties:
      Name: qldb-serverless-pattern
      DeletionProtection: false
      PermissionsMode: STANDARD
      Tags:
        - 
          Key: name
          Value: qldb-serverless-pattern

  # Create Lambda function to create Person record
  CreatePerson:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src
      Handler: create-person.handler
      Runtime: nodejs14.x
      Policies:
        - AWSLambdaBasicExecutionRole
        - Version: 2012-10-17
          Statement:
            - Effect: Allow 
              Action:
                - qldb:SendCommand
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}
            - Effect: Allow 
              Action:
                - qldb:PartiQLInsert
                - qldb:PartiQLUpdate
                - qldb:PartiQLSelect
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}/*
      Events:
        HttpPost:
          Type: Api
          Properties:
            Path: '/person'
            Method: post

  # Create Lambda function to retrieve latest Person details
  GetPerson:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src
      Handler: get-person.handler
      Runtime: nodejs14.x
      MemorySize: 512
      Policies:
        - AWSLambdaBasicExecutionRole
        - Version: 2012-10-17
          Statement:
            - Effect: Allow 
              Action:
                - qldb:SendCommand
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}
            - Effect: Allow 
              Action:
                - qldb:PartiQLSelect
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}/*
      Events:
        HttpPost:
          Type: Api
          Properties:
            Path: '/person/{personid}'
            Method: get

  # Create Lambda function to retrieve Person history
  GetPersonHistory:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src
      Handler: get-person-history.handler
      Runtime: nodejs14.x
      MemorySize: 512
      Policies:
        - AWSLambdaBasicExecutionRole
        - Version: 2012-10-17
          Statement:
            - Effect: Allow 
              Action:
                - qldb:SendCommand
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}
            - Effect: Allow 
              Action:
                - qldb:PartiQLHistoryFunction
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}/*
      Events:
        HttpPost:
          Type: Api
          Properties:
            Path: '/person/history/{personid}'
            Method: get

  # Create Lambda function to update Person record  
  UpdatePerson:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src
      Handler: update-person.handler
      Runtime: nodejs14.x
      MemorySize: 512
      Policies:
        - AWSLambdaBasicExecutionRole
        - Version: 2012-10-17
          Statement:
            - Effect: Allow 
              Action:
                - qldb:SendCommand
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}
            - Effect: Allow 
              Action:
                - qldb:PartiQLSelect
                - qldb:PartiQLUpdate
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}/*
      Events:
        HttpPost:
          Type: Api
          Properties:
            Path: '/person/{personid}'
            Method: post


  # Create Lambda function to delete Person record  
  DeletePerson:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src
      Handler: delete-person.handler
      Runtime: nodejs14.x
      MemorySize: 512
      Policies:
        - AWSLambdaBasicExecutionRole
        - Version: 2012-10-17
          Statement:
            - Effect: Allow 
              Action:
                - qldb:SendCommand
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}
            - Effect: Allow 
              Action:
                - qldb:PartiQLDelete
                - qldb:PartiQLSelect
              Resource: !Sub arn:aws:qldb:${AWS::Region}:${AWS::AccountId}:ledger/${QldbLedger}/*
      Events:
        HttpPost:
          Type: Api
          Properties:
            Path: '/person/{personid}'
            Method: delete


# List all common outputs for usage
Outputs:

  PersonApi:
    Description: "API Gateway endpoint URL for Prod stage for Person functions"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/person/"

  PersonLedger:
    Description: QLDB Ledger for the sample application
    Value: !Ref QldbLedger
    Export:
      Name: qldb-serverless-pattern