提问人:CptDayDreamer 提问时间:11/18/2020 最后编辑:CptDayDreamer 更新时间:12/8/2020 访问量:674
带有 Spring Boot Websockets (StompSession) 的 Django 通道不起作用
Django channels with Spring Boot Websockets (StompSession) do not work
问:
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。如果我尝试将一些东西从我们的 Angular 前端发送到 Django,它可以正常工作。否则,我们的 Spring Boot StompSession Websockets 可以与其他 Spring Boot 应用程序和 Angular 配合使用。
但是 Django 3.1.3 和 Spring Boot 2.3.3 没有。 此外,还使用了通道 3.0.2、channels-redis 3.2.0 和 redis 6 的 docker 容器。
我可以从 Django 服务器日志中看到什么:
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 请求传入,就会立即执行。
django 使用者(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
从 Spring Boot 中,我们发送一个 base64 编码的映像。但其他一切都不起作用。正如你所看到的,只是.text_data
CONNECT
Spring Boot:
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;
}
踩踏会话处理程序,让您了解它的外观。它应该进入 afterConnected() 方法,但它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);
}
}
我们试图在 Django 中将其更改为异步 websocket,但这并没有改变任何事情。in Djangos 方法似乎没有发送响应或 Spring Boot 需要继续的响应。self.accept
connect()
答: 暂无答案
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django-channels