带有 Spring Boot Websockets (StompSession) 的 Django 通道不起作用

嘿，我们想使用 Django 来执行 python 代码并使用通道来获取结果。实现了 websocket 无法正常工作的所有内容。如果我尝试从 Angular 前端发送一些东西到 Django，它工作得很好。否则，我们的 Spring Boot StompSession Websockets 可以与其他 Spring Boot 应用程序和 Angular 正常工作。

但 Django 3.1.3 和 Spring Boot 2.3.3 没有。 另外还使用了channels 3.0.2、channels-redis 3.2.0和redis 6的docker容器。

我可以从 Django 服务器日志中看到：

WebSocket HANDSHAKING /ws/card-detection/ [127.0.0.1:53209]
i'm in connect method
WebSocket CONNECT /ws/card-detection/ [127.0.0.1:53209]
i'm in receive method
text_data: CONNECT

一旦 websocket 请求到来，就会执行此操作。

django 消费者（没有上面记录的打印）：

class MyConsumer(WebsocketConsumer):
    groups = ["broadcast"]

    def connect(self):
        self.accept()

    def receive(self, text_data=None, bytes_data=None):
        self.send(text_data="Hello world!")

    def disconnect(self, close_code):
        pass

我们从 Spring Boot 发送一个 base64 编码的图像。但其他一切也不起作用。正如你所看到的text_data只是CONNECT.

春季启动：

     StompSessionHandler sessionHandler =
         new CardDetectionStompSessionHandler(request, user, webSocketMessagingService);
     createStompClient().connect(djangoServiceWSPath, sessionHandler);
     
   }
 
   private WebSocketStompClient createStompClient() {
     WebSocketClient client = new StandardWebSocketClient();
     WebSocketStompClient stompClient = new WebSocketStompClient(client);
     stompClient.setMessageConverter(new MappingJackson2MessageConverter());
     return stompClient;
   }

stomp 会话处理程序可让您了解它的外观。它应该进入 afterConnected() 方法，但永远不会进入以下任何方法：

 public class CardDetectionStompSessionHandler extends StompSessionHandlerAdapter {
   private final ImageClassificationRequest request;
   private final String username;
   private final String destination = "/card-detection/";
   private final WebSocketMessagingService webSocketMessagingService;
   private StompSession session;
 
   public CardDetectionStompSessionHandler(
       ImageClassificationRequest request,
       String username,
       WebSocketMessagingService webSocketMessagingService) {
     this.request = request;
     this.username = username;
     this.webSocketMessagingService = webSocketMessagingService;
   }
 
   @Override
   public void afterConnected(StompSession session, StompHeaders connectedHeaders) {
     log.info("Client: New session established: {}", session.getSessionId());
     this.session = session;
     session.subscribe("/user/queue/response", this);
     log.info("Client: Subscribed to \"/user/queue/response\"");
     session.send("/app" + destination, request);
     log.info("Client: Message sent to {}", session.getSessionId());
   }
 
   @Override
   public Type getPayloadType(StompHeaders headers) {
     return ImageClassificationResponse.class;
   }
 
   @Override
   public void handleFrame(StompHeaders headers, Object payload) {
     log.info("Client: Message received");
     ImageClassificationResponse response = (ImageClassificationResponse) payload;
     webSocketMessagingService.sendToUser(username, response);
     if (response.isDone()) {
       session.disconnect();
       log.info("Client: Disconnected.");
     }
   }
 
   @Override
   public void handleTransportError(StompSession session, Throwable exception) {
     log.info("Client: Django is not available");
     WebSocketResponse response = new WebSocketResponse();
     response.setDisconnect(true);
     webSocketMessagingService.sendToUser(username, response);
   }
 }

我们尝试将其更改为 Django 中的异步 Websocket，但这并没有改变任何事情。这self.accept在姜戈斯connect()方法似乎没有发送响应或者 Spring Boot 需要继续执行响应。