Renewing CQS lease

lease.js

    message.on('heartbeat', function(percent) {
      LOG.debug('heartbeat: ' + percent);

      if(percent < 66)
        return;

      if(percent > 99) {
        LOG.fatal('No more time for rake: ' + self.task);
        return self.cancel();
      }

      // In the red zone
      if(more_secs < MAX_SECS) {
        LOG.info('Requesting ' + more_secs + ' more seconds');
        message.visibility(more_secs, function(er) {
          if(er)
            LOG.warn('Failed to request ' + more_secs + ' seconds for rake: ' + self.task);
          more_secs *= 2;
        })
      }
    })