Class: JobQueue::BeanstalkAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/job_queue/adapters/beanstalk_adapter.rb

Defined Under Namespace

Classes: BeanstalkPoolFix

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ BeanstalkAdapter

Returns a new instance of BeanstalkAdapter.



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# File 'lib/job_queue/adapters/beanstalk_adapter.rb', line 5

def initialize(options = {})
  @hosts = options[:hosts] || 'localhost:11300'
end

Instance Method Details

#beanstalk_pool(queue = 'default') ⇒ Object 



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# File 'lib/job_queue/adapters/beanstalk_adapter.rb', line 75

def beanstalk_pool(queue='default')
  @beanstalk_pools ||= {}
  @beanstalk_pools[queue] ||= begin
    BeanstalkPoolFix.new([@hosts].flatten, queue)
  end
end

#job_stats(job_id) ⇒ Object 



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# File 'lib/job_queue/adapters/beanstalk_adapter.rb', line 62

def job_stats(job_id)
  host, id = job_id.split('_')
  beanstalk_pool.job_stats(id).select { |k, v| k == host }[0][1]
rescue Beanstalk::NotFoundError
  nil
end

#put(string, queue, priority, ttr) ⇒ Object 



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# File 'lib/job_queue/adapters/beanstalk_adapter.rb', line 9

def put(string, queue, priority, ttr)
  ttr = ttr.floor #rounding because Beanstalk doesnt accept float numbers
  raise JobQueue::ArgumentError, "TTR must be greater than 1" if ttr < 2

  delay = 0
  job_info = beanstalk_pool(queue).put_and_report_conn \
    string, priority, delay, ttr
  "#{job_info[:host]}_#{job_info[:id]}"
rescue Beanstalk::NotConnected
  raise JobQueue::NoConnectionAvailable
end

#queue_length(queue) ⇒ Object 



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# File 'lib/job_queue/adapters/beanstalk_adapter.rb', line 69

def queue_length(queue)
  beanstalk_pool.stats_tube(queue)["current-jobs-ready"]
rescue Beanstalk::NotFoundError
  0
end

#subscribe(error_report, cleanup_task, queue, &block) ⇒ Object 



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# File 'lib/job_queue/adapters/beanstalk_adapter.rb', line 21

def subscribe(error_report, cleanup_task, queue, &block)
  pool = BeanstalkPoolFix.new([@hosts].flatten, queue)
  loop do
    begin
      job = pool.reserve(1)
      time_left = job.stats["time-left"]
      JobQueue.logger.debug "Beanstalk received #{job.body}"
      Timeout::timeout([time_left - 1, 1].max) do
        yield job.body
      end
      job.delete
    rescue Timeout::Error
      cleanup_task.call(job.body)
      JobQueue.logger.warn "Job timed out"
      begin
        job.delete
      rescue Beanstalk::NotFoundError
        JobQueue.logger.error "Job timed out and could not be deleted"
      end
    rescue Beanstalk::TimedOut
      # Do nothing - retry to reseve (from another host?)
    rescue Beanstalk::NotConnected
      JobQueue.logger.fatal "Could not connect any beanstalk hosts. " \
        "Retrying in 1s."
      sleep 1
    rescue => e
      if job
        error_report.call(job.body, e)
        begin
          job.delete
        rescue Beanstalk::NotFoundError
          JobQueue.logger.error "Job failed but could not be deleted"
        end
      else
        JobQueue.logger.error "Unhandled exception: #{e.message}\n" \
          "#{e.backtrace.join("\n")}\n"
      end
    end
  end
end