Repeating weekday incident SMS alert that triggers inbetween work hours.

weekday_fake_alert_cycle.rb

require 'rubygems'

require 'active_support/time'
require 'clockwork'
require 'twilio-ruby'
require 'logger'

class WeekdayTimeKeeper
  START_WORK_DAY  = 10.hours.freeze
  END_WORK_DAY    = 17.hours.freeze
  WORKING_HOURS   = START_WORK_DAY..END_WORK_DAY.freeze

  attr_reader :time

  def initialize
    can_perform_today? ? configure_for_today! : next_time!
  end

  def next_time!
    @time = next_weekday + random_time_between_work_hours
  end

  def ready?
    @time <= Time.now
  end

  private

  def random_time_between_work_hours(range: WORKING_HOURS)
    rand range
  end

  def can_perform_today?
    WORKING_HOURS.cover?(starting_hours_minutes) || starting_hours_minutes < START_WORK_DAY
  end

  def configure_for_today!
    todays_start_time = [START_WORK_DAY, starting_hours_minutes].max
    todays_working_hours = todays_start_time..END_WORK_DAY
    @time = Date.today + random_time_between_work_hours(range: todays_working_hours)
  end

  def starting_hours_minutes
    cached_start_time.hour.hours + cached_start_time.min.minutes
  end

  def cached_start_time
    @cached_start_time ||= Time.now
  end

  def next_weekday
    tomorrow = Date.tomorrow
    [tomorrow].tap { |a| a << 2.days if tomorrow.saturday? }.reduce(:+)
  end
end

module FakeIncident
  ACCOUNT_SID = ENV.fetch('twilio_account_sid').freeze
  AUTH_TOKEN  = ENV.fetch('twilio_auth_token').freeze
  FROM_NUMBER = ENV.fetch('sms_from_number').freeze
  TO_NUMBER   = ENV.fetch('sms_to_number').freeze
  SMS_BODY = \
    'Something terrible has happened, all of the apps are breaking!'.freeze

  def send_sms
    client.account.messages.create from: FROM_NUMBER, to: TO_NUMBER, body: SMS_BODY
  end

  private

  def client
    @client ||= Twilio::REST::Client.new(ACCOUNT_SID, AUTH_TOKEN)
  end

  extend self
end

module FakeAlertCycle
  def start
    Clockwork.every 1.minute, 'fake-incident-sms.job' do
      logger.info "Configured to send SMS at: #{time_keeper.time}"
      if time_keeper.ready?
        logger.info 'Sending a Fake Incident SMS..'
        FakeIncident.send_sms
        time_keeper.next_time!
      end
    end
  end

  private

  def logger
    @logger ||= Logger.new STDOUT
  end

  def time_keeper
    @time_keeper ||= WeekdayTimeKeeper.new
  end

  extend self
end

FakeAlertCycle.start