AWSTemplateFormatVersion: 2010-09-09
Description: >-
  observability-app

Transform:
- AWS::Serverless-2016-10-31

Globals:
  Function:
    Runtime: nodejs18.x
    Timeout: 100
    MemorySize: 128
    CodeUri: ./
    Environment:
      Variables:
        APP_NAME: !Ref SampleTable
        SAMPLE_TABLE: !Ref SampleTable
        SERVICE_NAME: item_service
        ENABLE_DEBUG: false
        # Enable usage of KeepAlive to reduce overhead of short-lived actions, like DynamoDB queries
        AWS_NODEJS_CONNECTION_REUSE_ENABLED: 1

Resources:
# API Gateway
  Api:
    Type: AWS::Serverless::Api
    Properties:
      StageName: Prod

# Lambda Functions
  getAllItemsFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/get-all-items.getAllItemsHandler
      Description: A simple example includes a HTTP get method to get all items from a DynamoDB table.
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref SampleTable
        - CloudWatchPutMetricPolicy: {}
        - CloudWatchLambdaInsightsExecutionRolePolicy
      Events:
        Api:
          Type: Api
          Properties:
            RestApiId: !Ref Api
            Path: /items
            Method: GET
            
  getByIdFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/get-by-id.getByIdHandler
      Description: A simple example includes a HTTP get method to get one item by id from a DynamoDB table.
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref SampleTable
        - CloudWatchPutMetricPolicy: {}
        - CloudWatchLambdaInsightsExecutionRolePolicy
      Events:
        Api:
          Type: Api
          Properties:
            RestApiId: !Ref Api
            Path: /items/{id}
            Method: GET
            
  putItemFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/put-item.putItemHandler
      Description: A simple example includes a HTTP post method to add one item to a DynamoDB table.
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref SampleTable
        - CloudWatchPutMetricPolicy: {}
        - SNSPublishMessagePolicy:
            TopicName: !Sub ${NewItemTopic.TopicName}
        - CloudWatchLambdaInsightsExecutionRolePolicy
      Environment:
        Variables:
          TOPIC_NAME: !Ref NewItemTopic
      Events:
        Api:
          Type: Api
          Properties:
            RestApiId: !Ref Api
            Path: /items
            Method: POST

  notifyNewItemFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/notify-item.notifyNewItemHandler
      Description: A simple example that is triggered by a SNS message to notify of a new item insertion.
      Policies:
        - CloudWatchLambdaInsightsExecutionRolePolicy
      Events:
        TopicListener:
          Type: SNS
          Properties:
            Topic: !Ref NewItemTopic
            FilterPolicy:
              Status:
                - Success

# SNS Topic
  NewItemTopic:
    Type: AWS::SNS::Topic

# DynamoDB Table            
  SampleTable:
    Type: AWS::Serverless::SimpleTable
    Properties:
      PrimaryKey:
        Name: id
        Type: String

# CloudWatch Logs - Log Groups
  ApiAccessLogGroup:
    Type: AWS::Logs::LogGroup
    DependsOn: Api
    Properties:
      LogGroupName: !Sub /aws/apigateway/${Api}
      RetentionInDays: 7
  
  GetByIdLogGroup:
    Type: AWS::Logs::LogGroup
    DependsOn: getByIdFunction
    Properties:
      LogGroupName: !Sub /aws/lambda/${getByIdFunction}
      RetentionInDays: 7

  GetAllItemsLogGroup:
    Type: AWS::Logs::LogGroup
    DependsOn: getAllItemsFunction
    Properties:
      LogGroupName: !Sub /aws/lambda/${getAllItemsFunction}
      RetentionInDays: 7

  PutItemLogGroup:
    Type: AWS::Logs::LogGroup
    DependsOn: putItemFunction
    Properties:
      LogGroupName: !Sub /aws/lambda/${putItemFunction}
      RetentionInDays: 7

  NotifyItemLogGroup:
    Type: AWS::Logs::LogGroup
    DependsOn: notifyNewItemFunction
    Properties:
      LogGroupName: !Sub /aws/lambda/${notifyNewItemFunction}
      RetentionInDays: 7

Outputs:
  ApiUrl:
    Description: "API Gateway endpoint URL for Prod stage"
    Value: !Sub "https://${Api}.execute-api.${AWS::Region}.amazonaws.com/Prod/"

  SampleTable:
    Value: !GetAtt SampleTable.Arn
    Description: Sample Data Table ARN