Class: RabbitJobs::Scheduler

Inherits:
Object
  • Object
show all
Defined in:
lib/rabbit_jobs/scheduler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#background ⇒ Object

Returns the value of attribute background.



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# File 'lib/rabbit_jobs/scheduler.rb', line 10

def background
  @background
end

#pidfile ⇒ Object

Returns the value of attribute pidfile.



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# File 'lib/rabbit_jobs/scheduler.rb', line 10

def pidfile
  @pidfile
end

#process_name ⇒ Object

Returns the value of attribute process_name.



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# File 'lib/rabbit_jobs/scheduler.rb', line 10

def process_name
  @process_name
end

#schedule ⇒ Object

Returns the value of attribute schedule.



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# File 'lib/rabbit_jobs/scheduler.rb', line 10

def schedule
  @schedule
end

Instance Method Details

#clear_schedule! ⇒ Object

Stops old rufus scheduler and creates a new one. Returns the new rufus scheduler



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# File 'lib/rabbit_jobs/scheduler.rb', line 79

def clear_schedule!
  rufus_scheduler.stop
  @rufus_scheduler = nil
  rufus_scheduler
end

#load_default_schedule ⇒ Object 



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# File 'lib/rabbit_jobs/scheduler.rb', line 12

def load_default_schedule
  if defined?(Rails)
    file = Rails.root.join('config/schedule.yml')
    if file.file?
      @schedule = YAML.load_file(file)
    end
  end
end

#load_schedule! ⇒ Object

Pulls the schedule from Resque.schedule and loads it into the rufus scheduler instance



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# File 'lib/rabbit_jobs/scheduler.rb', line 23

def load_schedule!
  @schedule ||= load_default_schedule

  raise "You should setup a schedule or place it in config/schedule.yml" unless schedule

  schedule.each do |name, config|
    # If rails_env is set in the config, enforce ENV['RAILS_ENV'] as
    # required for the jobs to be scheduled.  If rails_env is missing, the
    # job should be scheduled regardless of what ENV['RAILS_ENV'] is set
    # to.
    if config['rails_env'].nil? || rails_env_matches?(config)
      interval_defined = false
      interval_types = %w{cron every}
      interval_types.each do |interval_type|
        if !config[interval_type].nil? && config[interval_type].length > 0
          RJ.logger.info "queueing #{config['class']} (#{name})"
          rufus_scheduler.send(interval_type, config[interval_type]) do
            publish_from_config(config)
          end
          interval_defined = true
          break
        end
      end
      unless interval_defined
        RJ.logger.warn "no #{interval_types.join(' / ')} found for #{config['class']} (#{name}) - skipping"
      end
    end
  end
end

#publish_from_config(config) ⇒ Object

Publish a job based on a config hash



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# File 'lib/rabbit_jobs/scheduler.rb', line 59

def publish_from_config(config)
  args = config['args'] || config[:args] || []
  klass_name = config['class'] || config[:class]
  params = args.is_a?(Hash) ? [args] : Array(args)
  queue = config['queue'] || config[:queue] || RJ.config.routing_keys.first

  RJ.logger.info "publishing #{config} at #{Time.now}"
  RJ.publish_to(queue, klass_name, *params)
rescue
  RJ.logger.warn "Failed to publish #{klass_name}:\n #{$!}\n params = #{params.inspect}"
  RJ.logger.warn $!.inspect
end

#rails_env_matches?(config) ⇒ Boolean

Returns true if the given schedule config hash matches the current ENV

Returns:

  • (Boolean) 


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# File 'lib/rabbit_jobs/scheduler.rb', line 54

def rails_env_matches?(config)
  config['rails_env'] && ENV['RAILS_ENV'] && config['rails_env'].gsub(/\s/,'').split(',').include?(ENV['RAILS_ENV'])
end

#rufus_scheduler ⇒ Object 



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# File 'lib/rabbit_jobs/scheduler.rb', line 72

def rufus_scheduler
  raise "Cannot start without eventmachine running." unless EM.reactor_running?
  @rufus_scheduler ||= Rufus::Scheduler.start_new
end

#shutdown ⇒ Object 



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# File 'lib/rabbit_jobs/scheduler.rb', line 131

def shutdown
  RJ.logger.info "Stopping..."
  @shutdown = true
end

#shutdown! ⇒ Object 



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# File 'lib/rabbit_jobs/scheduler.rb', line 166

def shutdown!
  shutdown
end

#startup ⇒ Object 



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# File 'lib/rabbit_jobs/scheduler.rb', line 136

def startup
  # prune_dead_workers
  RabbitJobs::Util.check_pidfile(self.pidfile) if self.pidfile

  if self.background
    child_pid = fork
    if child_pid
      return false
    else
      # daemonize child process
      Process.daemon(true)
    end
  end

  # Fix buffering so we can `rake rj:work > resque.log` and
  # get output from the child in there.
  $stdout.sync = true

  if self.pidfile
    File.open(self.pidfile, 'w') { |f| f << Process.pid }
  end

  @shutdown = false

  Signal.trap('TERM') { shutdown }
  Signal.trap('INT')  { shutdown! }

  true
end

#work(time = 0) ⇒ Object

Subscribes to channel and working on jobs



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# File 'lib/rabbit_jobs/scheduler.rb', line 86

def work(time = 0)
  begin
    return false unless startup

    $0 = self.process_name || "rj_scheduler"

    processed_count = 0
    RJ.run do
      load_schedule!

      check_shutdown = Proc.new {
        if @shutdown
          RJ.stop
          RJ.logger.info "Stopped."

          File.delete(self.pidfile) if self.pidfile
        end
      }

      if time > 0
        EM.add_timer(time) do
          self.shutdown
        end
      end

      EM.add_periodic_timer(1) do
        check_shutdown.call
      end

      RJ.logger.info "Started."
    end
  rescue => e
    error = $!
    if RJ.logger
      begin
        RJ.logger.error [error.message, error.backtrace].flatten.join("\n")
      ensure
        abort(error.message)
      end
    end
  end

  true
end