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Spring Websocket STOMP：发送RECEIPT帧

javaspringwebsocketstompspring-websocket
6

我有一个基于Spring和其SimpleBroker实现的Websocket-stomp服务器（不使用外部代理）。

我想启用STOMP RECEIPT消息。

我该如何配置我的代码来自动发送这些消息？

5个回答
8
在STOMP协议的Spring集成测试中，我们有如下代码：
    //SimpleBrokerMessageHandler doesn't support RECEIPT frame, hence we emulate it this way
    @Bean
    public ApplicationListener<SessionSubscribeEvent> webSocketEventListener(
            final AbstractSubscribableChannel clientOutboundChannel) {
        return event -> {
            Message<byte[]> message = event.getMessage();
            StompHeaderAccessor stompHeaderAccessor = StompHeaderAccessor.wrap(message);
            if (stompHeaderAccessor.getReceipt() != null) {
                stompHeaderAccessor.setHeader("stompCommand", StompCommand.RECEIPT);
                stompHeaderAccessor.setReceiptId(stompHeaderAccessor.getReceipt());
                clientOutboundChannel.send(
                        MessageBuilder.createMessage(new byte[0], stompHeaderAccessor.getMessageHeaders()));
            }
        };
    }

https://github.com/spring-projects/spring-integration/blob/master/spring-integration-stomp/src/test/java/org/springframework/integration/stomp/inbound/StompInboundChannelAdapterWebSocketIntegrationTests.java

2
一种类似于Artem Bilan的帖子的解决方案，使用一个独立的类来实现监听器。
@Component
public class SubscribeListener implements ApplicationListener<SessionSubscribeEvent> {
    @Autowired
    AbstractSubscribableChannel clientOutboundChannel;

    @Override
    public void onApplicationEvent(SessionSubscribeEvent event) {
        Message<byte[]> message = event.getMessage();
        StompHeaderAccessor stompHeaderAccessor = StompHeaderAccessor.wrap(message);

        if (stompHeaderAccessor.getReceipt() != null) {
            StompHeaderAccessor receipt = StompHeaderAccessor.create(StompCommand.RECEIPT);
            receipt.setReceiptId(stompHeaderAccessor.getReceipt());    
            receipt.setSessionId(stompHeaderAccessor.getSessionId());
            clientOutboundChannel.send(MessageBuilder.createMessage(new byte[0], receipt.getMessageHeaders()));
        }
    }
}
1
这就是我最终做的事情。
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketMessageBrokerConfigurer
        implements org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer {
        private MessageChannel outChannel;

    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {

        registration.interceptors(new ExecutorChannelInterceptor() {

            @Override
            public void afterMessageHandled(Message<?> inMessage,
                                            MessageChannel inChannel, MessageHandler handler, Exception ex) {
                if(outChannel == null) {
                    return;
                }

                StompHeaderAccessor inAccessor = StompHeaderAccessor.wrap(inMessage);
                String receipt = inAccessor.getReceipt();
                if (StringUtils.isEmpty(receipt)) {
                    return;
                }

                StompHeaderAccessor outAccessor = StompHeaderAccessor.create(StompCommand.RECEIPT);
                outAccessor.setSessionId(inAccessor.getSessionId());
                outAccessor.setReceiptId(receipt);
                outAccessor.setLeaveMutable(true);

                Message<byte[]> outMessage =
                    MessageBuilder.createMessage(new byte[0], outAccessor.getMessageHeaders());

                outChannel.send(outMessage);
            }
        });
    }

    public void configureClientOutboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ExecutorChannelInterceptor() {
            @Override
            public void afterMessageHandled(Message<?> message, MessageChannel channel, MessageHandler handler, @Nullable Exception ex) {
                outChannel = channel;
            }
        });
    }
}

对于测试，您需要使用任务调度程序配置stompClient。这样处理收据的任务才能进行。

stompClient.setTaskScheduler(taskScheduler);

然后需要配置 Session 和 Receiptable 对象。例如，在 Subscription 对象上使用 addReceiptTask。

        @Override
        public void afterConnected(StompSession session, StompHeaders connectedHeaders) {
            session.setAutoReceipt(true);
            StompSession.Subscription subscription = session.subscribe(topic, this);
            subscription.addReceiptTask(() -> {
                logger.info("Receipt for subscription ID {}", subscription.getSubscriptionId());
                connectedFuture.complete(null);
            });
            logger.info("Stomp Subscription ID is '{}' for topic '{}'.",
                    subscription.getSubscriptionId(), topic);

        }

如您所见，还有一个connectedFuture与订阅收据处理时完成。这使测试知道何时可以开始向客户端发送数据。

1

所有上述情况都会过早发送收据帧。

以下是您所需的内容。

参考：https://github.com/spring-projects/spring-framework/issues/21848

@Configuration
static class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    private MessageChannel outChannel;

    @Autowired
    public WebSocketConfig(MessageChannel clientOutboundChannel) {
        this.outChannel = clientOutboundChannel;
    }

    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {

        registration.interceptors(new ExecutorChannelInterceptor() {

            @Override
            public void afterMessageHandled(Message<?> inMessage,
                    MessageChannel inChannel, MessageHandler handler, Exception ex) {

                StompHeaderAccessor inAccessor = StompHeaderAccessor.wrap(inMessage);
                String receipt = inAccessor.getReceipt();
                if (StringUtils.isEmpty(receipt)) {
                    return;
                }

                StompHeaderAccessor outAccessor = StompHeaderAccessor.create(StompCommand.RECEIPT);
                outAccessor.setSessionId(inAccessor.getSessionId());
                outAccessor.setReceiptId(receipt);
                outAccessor.setLeaveMutable(true);

                Message<byte[]> outMessage =
                        MessageBuilder.createMessage(new byte[0], outAccessor.getMessageHeaders());

                outChannel.send(outMessage);
            }
        });
    }
} 
我认为这个答案已经过时了。现在自动装配MessageChannel时出现了错误。 - John Mercier
0
Artem Bilan 提供的答案仅适用于 SUBSCRIBE 帧。这里提供另一种方法，可以捕获任何带有 receipt 标头的传入帧。只需要扩展带有 @EnableWebSocketMessageBroker 注释的类，其他类（如带有 @Controller 注释的类）保持不变。 

import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.Map;
import java.util.List;
import java.util.HashMap;
import java.util.ArrayList;

import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.messaging.simp.config.SimpleBrokerRegistration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.support.ChannelInterceptorAdapter;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.SimpMessageType;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.MessageChannel;
import org.springframework.beans.factory.annotation.Autowired;

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    private static final Logger LOGGER = Logger.getLogger( WebSocketConfig.class.getName() );
    private MessageChannel outChannel;

    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors( new InboundMessageInterceptor() );
    }

    @Override
    public void configureClientOutboundChannel(ChannelRegistration registration) {
        registration.interceptors( new OutboundMessageInterceptor() );
    }

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
// prefixes are application-dependent
        config.enableSimpleBroker("/topic");
        config.setApplicationDestinationPrefixes("/app");
    }

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/note");
    }


    class InboundMessageInterceptor extends ChannelInterceptorAdapter {

        @SuppressWarnings("unchecked")
        public Message preSend(Message message, MessageChannel channel) {
            LOGGER.log( Level.SEVERE, "preSend: "+message );
            GenericMessage genericMessage = (GenericMessage)message;
            MessageHeaders headers = genericMessage.getHeaders();
            String simpSessionId = (String)headers.get( "simpSessionId" );
            if( ( SimpMessageType.MESSAGE.equals( headers.get( "simpMessageType" ) ) &&
                  StompCommand.SEND.equals( headers.get( "stompCommand" ) ) ) ||
                ( SimpMessageType.SUBSCRIBE.equals( headers.get( "simpMessageType" ) ) &&
                  StompCommand.SUBSCRIBE.equals( headers.get( "stompCommand" ) ) ) &&
                ( simpSessionId != null ) ) {
                Map<String,List<String>> nativeHeaders = (Map<String,List<String>>)headers.get( "nativeHeaders" );
                if( nativeHeaders != null ) {
                    List<String> receiptList = nativeHeaders.get( "receipt" );
                    if( receiptList != null ) {
                        String rid = (String)receiptList.get(0);
                        LOGGER.log( Level.SEVERE, "receipt requested: "+rid );
                        sendReceipt( rid, simpSessionId );
                    }
                }
            }
            return message;
        }

        private void sendReceipt( String rid, String simpSessionId ) {
            if( outChannel != null ) {
                HashMap<String,Object> rcptHeaders = new HashMap<String,Object>();
                rcptHeaders.put( "simpMessageType", SimpMessageType.OTHER );
                rcptHeaders.put( "stompCommand", StompCommand.RECEIPT );
                rcptHeaders.put( "simpSessionId", simpSessionId );
                HashMap<String,List<String>> nativeHeaders = new HashMap<String,List<String>>();
                ArrayList<String> receiptElements = new ArrayList<String>();
                receiptElements.add( rid );
                nativeHeaders.put( "receipt-id", receiptElements );
                rcptHeaders.put( "nativeHeaders",nativeHeaders );
                GenericMessage<byte[]> rcptMsg = new GenericMessage<byte[]>( new byte[0],new MessageHeaders( rcptHeaders ) );
                outChannel.send( rcptMsg );
            } else
                LOGGER.log( Level.SEVERE, "receipt NOT sent" );
        }
    }

    class OutboundMessageInterceptor extends ChannelInterceptorAdapter {
        public void postSend(Message message,
            MessageChannel channel,
            boolean sent) {
            LOGGER.log( Level.SEVERE, "postSend: "+message );
            outChannel = channel;
        }
    }
}

实际上，这比应该的要复杂得多，而且获取outChannel并不十分优雅。但它能正常工作。:-)
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