mtgprint_checker.rb

require 'logger'
require 'net/http'

PUSHOVER_USER_KEY = 'xxx'.freeze
PUSHOVER_API_TOKEN = 'xxx'.freeze

def send_notification(message)
  uri = URI.parse('https://api.pushover.net/1/messages.json')
  request = Net::HTTP::Post.new(uri)
  request.set_form_data(
    user: PUSHOVER_USER_KEY,
    token: PUSHOVER_API_TOKEN,
    message: message,
    priority: 1,
    # retry: 30,
    # expire: 10 * 60, # 10 minutes
    sound: :persistent,
    url: 'https://mtgprint.net/'
  )

  response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
    http.request(request)
  end

  raise "Push notification fail: #{response.body.inspect}" if response.code.to_i != 200
end

def check(method, url, body: nil, expected_code: 200, timeout: 10)
  uri = URI.parse(url)
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = (uri.scheme == 'https')
  http.open_timeout = timeout
  http.read_timeout = timeout
  http.write_timeout = timeout
  request =
    case method.to_s.upcase
    when 'GET'
      Net::HTTP::Get.new(uri.request_uri)
    when 'POST'
      req = Net::HTTP::Post.new(uri.request_uri)
      req['Content-Type'] = 'application/json'
      req.body = body
      req
    when 'PATCH'
      req = Net::HTTP::Patch.new(uri.request_uri)
      req['Content-Type'] = 'application/json'
      req.body = body
      req
    when 'PUT'
      req = Net::HTTP::Put.new(uri.request_uri)
      req['Content-Type'] = 'application/json'
      req.body = body
      req
    when 'DELETE'
      Net::HTTP::Delete.new(uri.request_uri)
    else
      raise "HTTP method not supported: #{method}"
    end
  response = http.request(request)
  return response.code.to_i == expected_code
end

# Start here

logger = Logger.new(STDOUT)

if check(:get, 'https://mtgprint.net/')
  logger.info 'Check MTG Print frontend: OK'
else
  logger.error 'Check MTG Print frontend: service is DOWN'
  send_notification('MTG Print frontend is DOWN')
end

if check(:post, 'https://api.mtgprint.net/deck', body: '{"deck": "Absorb"}')
  logger.info 'Check MTG Print backend: OK'
else
  logger.error 'Check MTG Print backend: service is DOWN'
  send_notification('MTG Print backend is DOWN')
end