AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Chat bot for reInvent trivia game

Parameters:
  TriviaBackendEndpoint:
    Type: String
    Default: 'https://api.reinvent-trivia.com'

Resources:
  BotFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: ./bot
      Handler: bot.handler
      Runtime: nodejs14.x
      Timeout: 60
      Environment:
        Variables:
          API_ENDPOINT: !Ref TriviaBackendEndpoint
      Events:
        Canary:
          Type: Schedule
          Properties:
            Schedule: rate(1 minute)
            Input: >-
              {
                "bot": {
                  "name": "TriviaGame",
                  "alias": "$LATEST",
                  "version": "$LATEST"
                },
                "currentIntent": {
                  "name": "LetsPlay",
                  "slots": {
                  }
                }
              }
      AutoPublishAlias: live
      DeploymentPreference:
        Enabled: true
        Type: Canary10Percent5Minutes
        Alarms:
          - !Ref BotLatestVersionErrorMetricGreaterThanZeroAlarm
          - !Ref BotAliasErrorMetricGreaterThanZeroAlarm
        Hooks:
          PreTraffic: !Ref PreTrafficHook

  BotAliasErrorMetricGreaterThanZeroAlarm:
    Type: "AWS::CloudWatch::Alarm"
    Properties:
      AlarmName: !Sub ${AWS::StackName}-BotAliasErrors
      AlarmDescription: Lambda Function Error > 0
      ComparisonOperator: GreaterThanThreshold
      Dimensions:
        - Name: Resource
          Value: !Sub "${BotFunction}:live"
        - Name: FunctionName
          Value: !Ref BotFunction
      EvaluationPeriods: 2
      MetricName: Errors
      Namespace: AWS/Lambda
      Period: 60
      Statistic: Sum
      Threshold: 0

  BotLatestVersionErrorMetricGreaterThanZeroAlarm:
    Type: "AWS::CloudWatch::Alarm"
    Properties:
      AlarmName: !Sub ${AWS::StackName}-BotLatestVersionErrors
      AlarmDescription: Lambda Function Error > 0
      ComparisonOperator: GreaterThanThreshold
      Dimensions:
        - Name: Resource
          Value: !Sub "${BotFunction}:live"
        - Name: FunctionName
          Value: !Ref BotFunction
        - Name: ExecutedVersion
          Value: !GetAtt BotFunction.Version.Version
      EvaluationPeriods: 2
      MetricName: Errors
      Namespace: AWS/Lambda
      Period: 60
      Statistic: Sum
      Threshold: 0

  PreTrafficHook:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: !Join
        - '-'
        - - 'CodeDeployHook_'
          - !Ref "AWS::StackName"
          - 'pre-traffic-hook'
      CodeUri: ./hook
      Timeout: 300
      Handler: pre-traffic-hook.handler
      Policies:
        - Version: "2012-10-17"
          Statement:
          - Effect: "Allow"
            Action:
              - "codedeploy:PutLifecycleEventHookExecutionStatus"
            Resource:
              !Sub 'arn:aws:codedeploy:${AWS::Region}:${AWS::AccountId}:deploymentgroup:${ServerlessDeploymentApplication}/*'
        - Version: "2012-10-17"
          Statement:
          - Effect: "Allow"
            Action:
              - "lambda:InvokeFunction"
            Resource: !Sub "${BotFunction.Arn}:*"
      Runtime: nodejs14.x
      DeploymentPreference:
        Enabled: false
        Role: ""
      Environment:
        Variables:
          CurrentVersion: !Ref BotFunction.Version

  LexPermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !Ref BotFunction.Alias
      Action: "lambda:invokeFunction"
      Principal: lex.amazonaws.com
      SourceArn: !Join
        - ':'
        - - 'arn'
          - !Ref "AWS::Partition"
          - 'lex'
          - !Ref "AWS::Region"
          - !Ref "AWS::AccountId"
          - 'intent:LetsPlay:*'