log_resque_working.rake

namespace :log_resque do

  desc "Print out (every 2 seconds) the number of busy and total workers for Resque"
  task :working do
    
    # In your Rails app directory :
    # bundle exec rake log_resque:working --silent >> log/resque_working.log &
    
    interval = 2.0
    
    rails_env = ENV['RAILS_ENV'] || 'production'
    root_dir = Pathname.new(__FILE__).dirname + '../../'
  
    yaml_file =  root_dir + 'config/redis.yml'
    data = YAML.load_file(yaml_file)
    redis_config = data.fetch(rails_env).fetch('resque').symbolize_keys

    Resque.redis = Redis.connect(redis_config)

    # log_device = root_dir + 'log/resque_working.log'
    log_device = STDOUT
    log_device.sync = true
    logger = Logger.new(log_device)

    loop do
      start_time = Time.now

      info = Resque.info
      message = "#{Time.now.iso8601} #{info[:working]} #{info[:workers]}"

      logger.info(message)

      total_time = Time.now - start_time
      sleep(interval - total_time)
    end
  end

end

I already many possible improvements :

• using a more advanced logger
• make it Rails/Bundler independant
• daemonize it for real, and possible monitor it with God/Monit/…
• format the data to help making graphs, …