# 
# This sample adds an Amazon DynamoDB table with an Amazon CloudWatch throttling alarm to the
# AWS Elastic Beanstalk environment.
#
# To configure the Alarm, you should create a separate configuration file that contains
# an option-settings section such as the following (all properties are showing the default values).
#
# option_settings:
#   "aws:elasticbeanstalk:customoption":
#     DDBAlarmEmail: "nobody@amazon.com"
#     DDBThrottledRequests: "1"
#
##

Resources:
  DDBTable:
    Type: AWS::DynamoDB::Table
    Properties:
      KeySchema:
         HashKeyElement:
           AttributeName: id
           AttributeType: S
      # create a table with the least available rd and wr throughput
      ProvisionedThroughput:
         ReadCapacityUnits: 1
         WriteCapacityUnits: 1

  DDBAlarmTopic:
    Type: AWS::SNS::Topic
    Properties:
      Subscription:
        - Endpoint:
            Fn::GetOptionSetting:
              OptionName: DDBAlarmEmail
              DefaultValue: "nobody@amazon.com"
          Protocol: email

  DDBThrottledRequestsAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmDescription: { "Fn::Join" : ["", [{ "Ref" : "AWSEBEnvironmentName" }, ": requests are being throttled." ]]}
      Namespace: AWS/DynamoDB
      MetricName: ThrottledRequests
      Dimensions:
        - Name: TableName
          Value : { "Ref" : "DDBTable" }
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 
        Fn::GetOptionSetting:
          OptionName: DDBThrottledRequests
          DefaultValue: 1
      ComparisonOperator: GreaterThanThreshold
      AlarmActions:
        - Ref: DDBAlarmTopic
      InsufficientDataActions:
        - Ref: DDBAlarmTopic