code: def main(argv):
    
  
    if flags.FLAGS.version:
      print("GRR server {}".format(config_server.VERSION["packageversion"]))
      return
  
    # We use .startswith so that multiple copies of services can easily be
    # created using systemd as worker1 worker2 ... worker25 etc.
  
    if not flags.FLAGS.component:
      raise ValueError("Need to specify which component to start.")
  
    # Start as a worker.
    if flags.FLAGS.component.startswith("worker"):
      worker.main([argv])
  
    # Start as a frontend that clients communicate with.
    elif flags.FLAGS.component.startswith("frontend"):
      frontend.main([argv])
  
    # Start as an AdminUI.
    elif flags.FLAGS.component.startswith("admin_ui"):
      admin_ui.main([argv])
  
    # Raise on invalid component.
    else:
      raise ValueError("No valid component specified. Got: "
                       "%s." % flags.FLAGS.component)
docs: Sets up all the component in their own threads.