---
AWSTemplateFormatVersion: 2010-09-09
Description: FIS for Spot Instances
Parameters:
  InstancesToInterrupt:
    Description: Number of instances to interrupt
    Default: 3
    Type: Number

  DurationBeforeInterruption:
    Description: Number of minutes before the interruption
    Default: 2
    Type: Number

Resources:

  FISSpotRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Statement:
        - Effect: Allow
          Principal:
            Service: [fis.amazonaws.com]
          Action: ["sts:AssumeRole"]
      Path: /
      Policies:
        - PolicyName: root
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action: 'ec2:DescribeInstances'
                Resource: '*'
              - Effect: Allow
                Action: 'ec2:SendSpotInstanceInterruptions'
                Resource: 'arn:aws:ec2:*:*:instance/*'

  FISExperimentTemplate:
    Type: AWS::FIS::ExperimentTemplate
    Properties:       
      Description: "Interrupt multiple random instances"
      Targets: 
        SpotIntances:
          ResourceTags: 
            ResourceTagKey: ResourceTagValue
          Filters:
            - Path: State.Name
              Values: 
              - running
          ResourceType: aws:ec2:spot-instance
          SelectionMode: !Join ["", ["COUNT(", !Ref InstancesToInterrupt, ")"]]
      Actions: 
        interrupt:
          ActionId: "aws:ec2:send-spot-instance-interruptions"
          Description: "Interrupt multiple Spot instances"
          Parameters: 
            durationBeforeInterruption: !Join ["", ["PT", !Ref DurationBeforeInterruption, "M"]]
          Targets: 
            SpotInstances: SpotIntances
      StopConditions:
        - Source: none
      RoleArn: !GetAtt FISSpotRole.Arn
      Tags: 
        Name: "FIS_EXP_NAME"

Outputs:
  FISExperimentID:
    Value: !GetAtt FISExperimentTemplate.Id
...