Question

我有一个机器学习功能，可以实时循环处理视频，如果算法发现视频有故障，我需要向前端发送通知，我正在使用Tornado Web和Python。我使用了Request-Handler和Websocket-Handler，但是该函数阻止服务器正常运行，因为它阻塞了循环。所以我该如何在服务器中使用此功能。

class DataSource(object):
    def __init__(self, initial_data=None):
       self._data = initial_data
    @property
    def data(self):
       return self._data        
    @data.setter
    def data(self, new_data):
       self._data = new_data
class EventSource(web.RequestHandler):
   def initialize(self, source):
       self.source = source
       self._last = None
       self.set_header('content-type', 'text/event-stream')
       self.set_header('cache-control', 'no-cache')
   @tornado.gen.coroutine
   def publish(self, data):
      try:
         self.write('data: {}\n\n'.format(data))
         yield self.flush()
      except StreamClosedError:
        pass
   @tornado.gen.coroutine
   def get(self):
    while True:
        if self.source.data != self._last:
            yield self.publish(self.source.data)
            self._last = self.source.data
        else:
            yield tornado.gen.sleep(0.005)
generator = processing.video_processing() #loop function (yields)
publisher = DataSource(next(generator))
def get_next():
  publisher.data = next(generator)
  print(publisher.data)
checker = PeriodicCallback(lambda: get_next(), 1000.)
checker.start()

class Application(tornado.web.Application):
  def __init__(self):
    handlers = [
        tornado.web.url(r"/charts", ChartPageHandler, name="charts"),
        tornado.web.url(r"/historique_images", HistoriqueImagesPageHandler, name="historique_images"),
        tornado.web.url(r"/tables", TablePageHandler, name="tables"),
        tornado.web.url(r"/streaming",StreamingPageHandler, name="streaming"),
        tornado.web.url(r'/ws/', WebSocketHandler, name="websocket"),
        tornado.web.url(r'/events', EventSource, dict(source=publisher)),             
        tornado.web.url(r'/ws_stream/', StreamSocketHandler, name="ws_stream"),    
    ]
    settings = dict(
        template_path = os.path.join(os.path.dirname(__file__), "templates"),
        static_path = os.path.join(os.path.dirname(__file__), "static"),
        debug = True,
        cookie_secret = "bZJc2sWbQLKos6GkHn/VB9oXwQt8S0R0kRvJ5/xJ89E=",
        login_url = "/login",
        xsrf_cookies = True,
    )
    super(Application, self).__init__(handlers, **settings)
if __name__ == "__main__":
    options.parse_command_line()
    app = Application()
    server = HTTPServer(app)
    server.listen(config.PORT)
    signal.signal(signal.SIGINT, lambda x, y:IOLoop.instance().stop())
    IOLoop.instance().start()

在龙卷风中使用循环功能而不阻塞服务器

0 个答案: