code: def advertise(tchannel, service, routers=None, timeout=None, router_file=None,
                jitter=None):
      
      timeout = timeout or FIRST_ADVERTISE_TIME
      if routers is not None and router_file is not None:
          raise ValueError(
              'Only one of routers and router_file can be provided.')
  
      if routers is None and router_file is not None:
          # should just let the exceptions fly
          try:
              with open(router_file, 'r') as json_data:
                  routers = json.load(json_data)
          except (IOError, OSError, ValueError):
              log.exception('Failed to read seed routers list.')
              raise
  
      for router in routers:
          # We use .get here instead of .add because we don't want to fail if a
          # TChannel already knows about some of the routers.
          tchannel.peers.get(router)
  
      adv = Advertiser(service, tchannel, ttl_secs=timeout,
                       interval_max_jitter_secs=jitter)
      return adv.start()
docs: Advertise with Hyperbahn.
  
      See :py:class:`tchannel.TChannel.advertise`.