douptimer.rb

require 'uptimerobot'
require 'droplet_kit'
require 'rufus-scheduler'

include UptimeRobot::Monitor

UP_TOKEN   = ''
DO_TOKEN   = ''
DROPLET_ID = 0

def restart_droplet!
  @do_client ||= DropletKit::Client.new(access_token: DO_TOKEN)
  @do_client.droplet_actions.power_cycle(droplet_id: DROPLET_ID)
end

def on_droplet_down(&block)
  @up_client ||= UptimeRobot::Client.new(apiKey: UP_TOKEN)
  monitor      = @up_client.getMonitors['monitors']['monitor'][0]
  instance_eval(&block) if monitor['status'].to_i != Status::Up
end

Rufus::Scheduler.s.every '5m' do
  on_droplet_down { restart_droplet! }
end