WebSocket 关闭并出现协议错误 1002

Question

我正在实现 WebSocket 消息命令行客户端。我已经检查过这个错误对应于协议的问题。我将 ws 升级到最新的 7.4.1。在后端，我使用 Spring Boot Websockets 2.3.4.RELEASE.

据说造成这种情况的 2 个主要原因是数据包丢失或格式错误的消息。 我已经做了一些检查来检查这些但 none 似乎有效。我测试的消息很小，所以消息大小不应该是这种情况。连接完全在本地主机上。我用 3 个用户测试了该解决方案，有时我得到这个错误，有时却没有。

谁能帮我弄清楚如何消除此类错误？

这是我用于客户端发送消息的代码：

async function test(number_of_messages, break_between_messages) {
const websocket = new WebSocket(url...)

websocket.on('message', function incoming(data) {
    console.log(getMessage("Received", data))
});

websocket.on('close', function(data) {
    console.log('Disconnected!!!! ' + data.toString());
});

const opened = await connection(websocket)

//Wait 5 seconds
await sleep(5_000);

if (opened) {
    for (i = 0; i < number_of_messages; i++) {

        for (const chatId of chatIds) {
            let content = i.toString() + " from " + user;
            let msg = JSON.stringify({
                "chatId": chatId,
                "author": user,
                "content": content
            })
            websocket.send(msg)

            let message = getMessage("Sent", msg)
            console.log(message)
        }

        await sleep(break_between_messages);
    }

} else {
    console.log("ERROR on Opening Connection")
    return
}

// Wait 1 minute
await sleep(60_000);
websocket.close()

}

后端代码：

@Component
@ServerEndpoint(value = "/webSocket/{username}",
        encoders = MessageRepresentationEncoder.class, decoders = MessageRepresentationDecoder.class)
public class MessagingSocket {
    private Logger logger = LoggerFactory.getInstance();
    private Session session;
    private MessagingAPI messagingAPI = MessagingAPIFactory.createAPI();
    private UserSocketRegistry userSocketRegistry = UserSocketRegistry.createRegistry();
    private SessionUserRegistry sessionUserRegistry = SessionUserRegistry.createRegistry();

    @OnOpen
    public void onOpen(Session session, @PathParam("username") String username) {
        this.session = session;
        logger.log(LoggingType.INFO, "Started new session " + session.getId());
        logger.log(LoggingType.INFO, username + " connected");

        userSocketRegistry.addSessionForUser(this, username);
        sessionUserRegistry.addSessionForUser(session, username);
    }

    @OnMessage //Allows the client to send message to the socket.
    public void onMessage(MessageRepresentation messageRepresentation) {
        logger.log(LoggingType.INFO, "Received " + messageRepresentation.toString());
        messagingAPI.write(WriteMessage.from(UUID.fromString(messageRepresentation.chatId), messageRepresentation.author, messageRepresentation.content));
        broadcastToChat(messageRepresentation);
    }

    private void broadcastToChat(MessageRepresentation message) {
        final List<MessagingSocket> sockets = messagingAPI.getUsersConnectedToChat(UUID.fromString(message.chatId)).stream().filter(user -> userSocketRegistry.hasSocketFor(user.getName()))
                .map(user -> userSocketRegistry.getSocketFor(user.getName())).collect(Collectors.toList());

        logger.log(LoggingType.INFO, "Starting broadcast of " + message.content + " from " + message.author + " for " + String.join(",", messagingAPI.getUsersConnectedToChat(UUID.fromString(message.chatId)).stream().map(x -> x.getName()).collect(Collectors.toList())));
        for (MessagingSocket messagingSocket : sockets) {
            logger.log(LoggingType.INFO, "Broadcasting message" + message.content + " to " + messagingSocket.session.getId());
            messagingSocket.sendMessage(message);

        }
    }

    private void sendMessage(MessageRepresentation message) {
        try {
            this.session.getBasicRemote().sendObject(message);
        } catch (IOException | EncodeException e) {
            logger.log(LoggingType.ERROR, "Caught exception while sending message to Session Id: " + this.session.getId());
        }
    }

    @OnClose
    public void onClose(Session session) {
        String user = sessionUserRegistry.getUserFor(session);
        logger.log(LoggingType.INFO, "User " + user + " with session " + this.session.getId() + " disconnected ");
        sessionUserRegistry.removeSession(session);
        userSocketRegistry.removeUser(user);
    }
}

MessageRepresentation 为：

public class MessageRepresentation {
    public String chatId;
    public String author;
    public String content;

    @Override
    public String toString() {
        return "MessageRepresentation{" +
                "chatId='" + chatId + '\'' +
                ", author='" + author + '\'' +
                ", content='" + content + '\'' +
                '}';
    }
}

经过进一步调查，我收到以下异常：

java.lang.IllegalStateException: The remote endpoint was in state [TEXT_FULL_WRITING] which is an invalid state for called method
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase$StateMachine.checkState(WsRemoteEndpointImplBase.java:1243)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase$StateMachine.textStart(WsRemoteEndpointImplBase.java:1205)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendString(WsRemoteEndpointImplBase.java:191)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendObject(WsRemoteEndpointImplBase.java:600)
at org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendObject(WsRemoteEndpointBasic.java:74)
at presentation.frontend.websockets.server.MessagingSocket.sendMessage(MessagingSocket.java:64)
at presentation.frontend.websockets.server.MessagingSocket.broadcastToChat(MessagingSocket.java:57)
at presentation.frontend.websockets.server.MessagingSocket.onMessage(MessagingSocket.java:47)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.tomcat.websocket.pojo.PojoMessageHandlerWholeBase.onMessage(PojoMessageHandlerWholeBase.java:80)
at org.apache.tomcat.websocket.WsFrameBase.sendMessageText(WsFrameBase.java:402)
at org.apache.tomcat.websocket.server.WsFrameServer.sendMessageText(WsFrameServer.java:119)
at org.apache.tomcat.websocket.WsFrameBase.processDataText(WsFrameBase.java:502)
at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:301)
at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133)
at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:82)
at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:171)
at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:151)
at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:148)
at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:54)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:59)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)

java.lang.IllegalStateException: 由于WebSocket 会话已关闭，消息将不会发送

Answer 1

我在这里可能偏离了标记，但我认为这可能是由于消息包含无效的 UTF8 或类似内容。即畸形。

如果这听起来像是原因，那么简单的解决方法就是对 msg

进行编码

        let msg = JSON.stringify({
            "chatId": chatId,
            "author": user,
            "content": content
        })

到

  let msg = unescape(encodeURIComponent(JSON.stringify({
                "chatId": chatId,
                "author": user,
                "content": content
            })));

然后在另一边解码...

JSON.parse(decodeURIComponent(escape( ... )))

Answer 2

这一问题的解决方案涉及 2 个步骤。

1：查找错误堆栈跟踪

@OnError
public void onError(Session session, Throwable throwable) {
    logger.log(LoggingType.ERROR, "Error for " + session.getId() + " caused by: " + throwable.getMessage());
    throwable.printStackTrace();
}

2：在广播消息中将同步BasicRemote改为异步AsyncRemote（当消息数量增加时这一点很重要）

private void sendMessage(MessageRepresentation message) {
        this.session.getAsyncRemote().sendObject(message);
    }

WebSocket 关闭并出现协议错误 1002

WebSocket Closes with Protocol Error 1002

javascript

websocket

spring-boot

ws