chat_engine.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Globals:
  Function:
    Runtime: python3.9

Resources:
  IntentDataLoaderFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: s3://hensos-personal-assistant/intents/intents-deployment-package.zip
      Handler: load_all_intents.lambda_handler
      Description: Loads intent data into the Lex bot
      Timeout: 10
      Role: !GetAtt IntentDataLoaderFunctionRole.Arn
      Policies:
        - LexBotPolicy:
            BotName: !Ref HensoPersonalAssistantChatBot
      Environment:
        Variables:
          bot_name: !Ref HensoPersonalAssistantChatBot
          intent_table: !Ref IntentDatabase

  IntentDataLoaderFunctionRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: IntentDataLoaderFunctionRole
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: IntentDataLoaderFunctionPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - 'lex:PutIntent'
                  - 'lex:GetIntent'
                Resource: '*'
              - Effect: Allow
                Action:
                  - 'dynamodb:GetItem'
                  - 'dynamodb:Scan'
                Resource: !GetAtt IntentDatabase.Arn

  IntentDataLoader:
    Type: Custom::IntentDataLoader
    DependsOn:
      - IntentDataLoaderFunction
      - IntentDataLoaderFunctionRole
    Properties:
      service_token: !GetAtt IntentDataLoaderFunction.Arn
      bot_name: !Ref HensoPersonalAssistantChatBot
      table_name: !Ref IntentDatabase

  HensoPersonalAssistantChatBot:
    Type: 'AWS::Lex::Bot'
    Properties:
      Name: hensoPersonalAssistantChatEngine
      Description: Henso's AI's chat functionality
      IdleSessionTTLInSeconds: 300
      RoleArn: !GetAtt IntentDataLoaderFunctionRole.Arn
      DataPrivacy:
        ChildDirected: False
      BotLocales:
        - LocaleId: en_US
          NluConfidenceThreshold: 0.40
          VoiceSettings:
            VoiceId: Matthew
          Intents:
            - Name: "FallbackIntent"
              Description: "Default intent when no other intent matches"
              ParentIntentSignature: "AMAZON.FallbackIntent"
      

  IntentDatabase:
    Type: 'AWS::DynamoDB::Table'
    Properties:
      TableName: hensosAIIntentDB
      AttributeDefinitions:
        - AttributeName: intent_name
          AttributeType: S
        - AttributeName: intent_data
          AttributeType: S
      KeySchema:
        - AttributeName: intent_name
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: 5
        WriteCapacityUnits: 5
      GlobalSecondaryIndexes:
        - IndexName: intent_data_index
          KeySchema:
            - AttributeName: intent_data
              KeyType: HASH
          Projection:
            ProjectionType: ALL
          ProvisionedThroughput:
            ReadCapacityUnits: 5
            WriteCapacityUnits: 5  

  AddIntentFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: AddIntentFunction
      Runtime: python3.9
      Handler: add_intent.lambda_handler
      CodeUri: s3://hensos-personal-assistant/intents/intents-deployment-package.zip
      Environment:
        Variables:
          INTENT_TABLE_NAME: !Ref IntentDatabase
      Events:
        AddIntentAPI:
          Type: Api
          Properties:
            Path: /intents
            Method: post

  GetIntentFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: GetIntentFunction
      Runtime: python3.9
      Handler: get_intent.lambda_handler
      CodeUri: s3://hensos-personal-assistant/intents/intents-deployment-package.zip
      Environment:
        Variables:
          INTENT_TABLE_NAME: !Ref IntentDatabase
      Events:
        GetIntentAPI:
          Type: Api
          Properties:
            Path: /intents/{intent_name}
            Method: get          

  UpdateIntentFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: UpdateIntentFunction
      Handler: update_intent.lambda_handler
      CodeUri: s3://hensos-personal-assistant/intents/intents-deployment-package.zip
      Environment:
        Variables:
          INTENT_TABLE_NAME: !Ref IntentDatabase
      Events:
        UpdateIntentAPI:
          Type: Api
          Properties:
            Path: /intents/{intent_name}
            Method: put

  DeleteIntentFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: DeleteIntentFunction
      Runtime: python3.9
      Handler: delete_intent.lambda_handler
      CodeUri: s3://hensos-personal-assistant/intents/intents-deployment-package.zip

  GetAllIntentsFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: GetAllIntentsFunction
      Runtime: python3.9
      Handler: get_all_intents.lambda_handler
      CodeUri: s3://hensos-personal-assistant/intents/intents-deployment-package.zip
      Environment:
        Variables:
          INTENT_TABLE_NAME: !Ref IntentDatabase
      Events:
        GetAllIntentsAPI:
          Type: Api
          Properties:
            Path: /intents
            Method: get                     

Outputs:
  BotName:
    Value: !Ref HensoPersonalAssistantChatBot
    Export:
      Name: BotName