template.yaml

AWSTemplateFormatVersion: 2010-09-09
Description: "earthquake-notifier"

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

Parameters:
  PrefixParam:
    Type: String
    Description: A stack prefix used to name resources
    Default: earthquake-notifier
  EventBusNameParam:
    Type: String
    Description: The name of the EventBridge bus to use
    Default: default
  CenterLatLonParam:
    Type: String
    Description: Point to monitor for close earthquakes. LatLon format (e.g. "37.5079,15.0830")
    Default: "37.5079,15.0830" # CATANIA
  MinMagnitudeParam:
    Type: String
    Description: A float representing the minimum magnitude to alert on
    Default: "3.5" # 3.5ML
  MaxDistanceMetersParam:
    Type: String
    Description: The max distance from the center in meters to monitor for
    Default: "2000000" # 200 Km
  EmailAddressParam:
    Type: String
    Description: The email address to subscribe to for notifications

Resources:
  monitorEarthquakes:
    Type: AWS::Serverless::Function
    Metadata:
      BuildMethod: rust-cargolambda
      BuildProperties:
        Binary: earthquake-notifier
    Properties:
      Description: Monitors for recent heartquakes matching certain conditions and send events to EventBridge
      CodeUri: ./
      Handler: bootstrap
      Runtime: provided.al2
      Architectures:
        - arm64
      MemorySize: 512
      Timeout: 5
      Environment:
        Variables:
          CENTER_LAT_LON: !Ref CenterLatLonParam
          MIN_MAGNITUDE: !Ref MinMagnitudeParam
          MAX_DISTANCE_METERS: !Ref MaxDistanceMetersParam
          EVENT_BUS: !Ref EventBusNameParam
      Policies:
        - EventBridgePutEventsPolicy:
            EventBusName: !Ref EventBusNameParam
      Events:
        Scheduled:
          Type: Schedule
          Properties:
            Schedule: "rate(1 hour)"
            Name: EveryHour
            Description: run every hour
            Enabled: true

  EventsLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      RetentionInDays: 7
      LogGroupName: !Sub "${PrefixParam}-events"

  EventsLogGroupPolicy:
    Type: AWS::Logs::ResourcePolicy
    Properties:
      PolicyName: !Sub "${PrefixParam}-events-log-policy"
      PolicyDocument: !Sub >
        {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Sid": "EventBridgetoCWLogsCreateLogStreamPolicy",
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "events.amazonaws.com"
                ]
              },
              "Action": [
                "logs:CreateLogStream"
              ],
              "Resource": [
                "${EventsLogGroup.Arn}"
              ]
            },
            {
              "Sid": "EventBridgetoCWLogsPutLogEventsPolicy",
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "events.amazonaws.com"
                ]
              },
              "Action": [
                "logs:PutLogEvents"
              ],
              "Resource": [
                "${EventsLogGroup.Arn}"
              ],
              "Condition": {
                "ArnEquals": {"AWS:SourceArn": "${EventsRule.Arn}"}
              }
            }
          ]
        }

  NotificationTopic:
    Type: AWS::SNS::Topic
    Properties:
      Subscription:
        - Endpoint: !Ref EmailAddressParam
          Protocol: email
      TopicName: !Sub "${PrefixParam}-topic"

  TopicPolicy:
    Type: AWS::SNS::TopicPolicy
    Properties:
      PolicyDocument:
        Statement:
          - Principal:
              Service: events.amazonaws.com
            Action: sns:Publish
            Effect: Allow
            Resource: !Ref NotificationTopic
      Topics:
        - !Ref NotificationTopic

  EventsRule:
    Type: AWS::Events::Rule
    Properties:
      EventBusName: !Ref EventBusNameParam
      EventPattern:
        source:
          - "earthquake-notifier"
      Name: !Sub "${PrefixParam}-EventsRule"
      State: ENABLED
      Targets:
        - Arn: !Ref NotificationTopic
          Id: !Sub ${PrefixParam}-topic
        - Arn: !Sub ${EventsLogGroup.Arn}
          Id: !Sub ${PrefixParam}-logs