Method: Extface::Driver#push

Defined in:
app/models/extface/driver.rb

#push(buffer) ⇒ Object 



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# File 'app/models/extface/driver.rb', line 47

def push(buffer)
  if @job
    #retry if current device job is not @job (waiting on queue)
    wait_on_queue = 2 #stop me writing endless things
    if current_device_job = device.jobs(true).active.try(:first)
      if current_device_job != @job
        wait_on_queue = 20 #FIXME!
        p "#### current_job is not first_on_queue"
      end
    end
    begin
      Timeout.timeout(Extface.device_timeout) do
        Extface.redis_block do |r|
          r.subscribe(@job.id) do |on| #blocking until delivered
            on.subscribe do |channel, subscriptions|
              @job.rpush buffer
              logger.debug "--> #{buffer.bytes.map{ |b| '%02X' % b }.join(' ')}" if development?
            end
            on.message do |event, data|
              r.unsubscribe
              @job.connected!
            end
          end
        end
      end
    rescue Timeout::Error
      (wait_on_queue -= 1) > 0 ? retry : raise("Timeout waiting on queue") #let it be!
    end
  else
    raise "No job given"
  end
end