heroku scheduler workaround

bi_daily_scheduler.rb

class BiDailyScheduler < HerokuScheduler
  def should_run?
    (Time.now.hour % 12) == hour
  end
end

bi_daily_scheduler_test.rb

require 'test_helper'

class BiDailySchedulerTest < ActiveSupport::TestCase
  def setup
    @hour = Time.now.hour
  end

  test 'should perform task if current hour' do
    assert BiDailyScheduler.new(@hour).should_run?
  end

  test 'performs task at 12 hours from current hour' do
    assert BiDailyScheduler.new(@hour + 12).should_run?
  end

  test 'should not perform task if different hour' do
    refute BiDailyScheduler.new(@hour + 1).should_run?
  end

  test 'should not perform task 16 hours from current hour' do
    refute BiDailyScheduler.new(@hour + 16).should_run?
  end

  test 'should perform scheduled task' do
    block_code = BiDailyScheduler.new(@hour).schedule { 'performed a task' }
    assert_equal 'performed a task', block_code
  end
end

heroku_scheduler.rb

class HerokuScheduler
  attr_reader :hour
  
  def initialize(hour=2)
    @hour = hour % 12
  end

  def schedule
    yield if should_run?
  end

  def should_run?
    true
  end
end

scrape.rake

namespace :scrape do
  desc "Scrape guitar forum"

  task larrivee: :environment do
    BiDailyScheduler.new(4).schedule do
      scrape Larrivee
    end
  end

  task martin: :environment do
    BiDailyScheduler.new(5).schedule do
      scrape Martin
    end
  end
end

def scrape(object)
  puts "scraping #{object} pages..."
  scraper = "#{object}Scraper".constantize.new
  scraper.parse_pages.create_posts(object)
  puts "scraping complete"
end