text: #!/usr/bin/env python
  import sys
  from tornado.wsgi import WSGIContainer
  from tornado.httpserver import HTTPServer
  from tornado.ioloop import IOLoop
  import vnaas
  
  PORT = 8080
  
  def main():
      if len(sys.argv) == 1:
          port = PORT
      elif len(sys.argv) == 2:
          port = int(sys.argv[1])
      else:
          print("usage: wsgi.py [port]")
          return
      http_server = HTTPServer(WSGIContainer(vnaas.app))
      http_server.listen(port)
      IOLoop.instance().start()
  
  
  if __name__ == "__main__":
      main()
  