template.yaml

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

Resources:
  EventHandler:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: ./functions
      Environment:
        Variables:
          EVENT_STORE_TABLE_NAME: !Ref EventStore
          TSDB_DB_NAME: !Ref Database
          TSDB_TABLE_NAME: !Ref Table
      Handler: handler.handle
      Runtime: python3.8
      Role: !GetAtt Role.Arn
      Events:
        DomainEvents:
          Type: CloudWatchEvent
          Properties:
            Pattern:
              source:
                - prefix: "josharmi"

  Role:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: DynamoDB
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - dynamodb:GetItem
                  - dynamodb:PutItem
                Resource:
                  - !GetAtt EventStore.Arn
        - PolicyName: TimeStream
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - timestream:DescribeEndpoints
                Resource: "*"
        - PolicyName: TimeStreamTable
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - timestream:WriteRecords
                Resource:
                  - !GetAtt Table.Arn
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

  Database:
    Type: AWS::Timestream::Database
    Properties:
      DatabaseName: SLO

  Table:
    Type: AWS::Timestream::Table
    Properties:
      DatabaseName: !Ref Database
      RetentionProperties:
        MemoryStoreRetentionPeriodInHours: "24"
        MagneticStoreRetentionPeriodInDays: "7"
      TableName: Events

  EventStore:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
        - AttributeName: "PKEY"
          AttributeType: "S"
      BillingMode: PAY_PER_REQUEST
      KeySchema:
        - AttributeName: "PKEY"
          KeyType: "HASH"
      TableName: EventStore