當響應來自使用 Spring 集成 DSL 的 rabbitMQ 回復隊列時，如何實現 HTTP 請求/回復？

Question

我正在嘗試使用 Spring 集成 DSL 中的單獨 RabbitMQ 隊列來實現 HTTP 請求/回復。 它類似於Spring IntegrationFlow http request to amqp queue 。 不同之處在於我希望將響應返回給原始 http 調用者。 我可以看到測試 http 發布消息成功傳遞到請求隊列並轉換（大寫）到響應隊列。 該消息也從響應隊列中消耗，但從未返回給調用者（http://localhost:8080/Tunner）。 最終調用超時，出現 500 錯誤。 我是新手，所以可能有一些我完全錯過的東西。 有人可以提供建議嗎？ 代碼如下：

public class TunnelApplication
{
    public static void main(String[] args)
    {
        SpringApplication.run(TunnelApplication.class, args);
    }

    @Value("${outboundQueue}")
    private String outboundQueue;

    @Value("${inboundQueue}")
    private String inboundQueue;

    private ConnectionFactory rabbitConnectionFactory;

    @Autowired
    public TunnelApplication(ConnectionFactory factory) {
        rabbitConnectionFactory = factory;
    }

    @Bean
    public Queue targetQueue()
    {
        return new Queue(outboundQueue, true, false, true);
    }

    @Bean
    public Queue requestQueue()
    {
        return new Queue(inboundQueue, true, false, true);
    }

    @Bean
    public Jackson2JsonMessageConverter jsonMessageConverter()
    {
        return new Jackson2JsonMessageConverter();
    }

    @Bean
    public AmqpTemplate amqpTemplate()
    {
        RabbitTemplate result = new RabbitTemplate(rabbitConnectionFactory);
        result.setMessageConverter(jsonMessageConverter());
        result.setDefaultReceiveQueue(outboundQueue);
        //result.setReplyAddress(outboundQueue);
        result.setReplyTimeout(60000);
        return result;
    }

    @Bean
    public IntegrationFlow sendReceiveFlow(RabbitTemplate amqpTemplate) {
        return IntegrationFlows
                .from(Http.inboundGateway("/tunnel"))
                .handle(Amqp.outboundGateway(amqpTemplate)
                        .routingKey(inboundQueue)
                        .returnChannel(amqpOutboundChannel()))
                .log()
                .bridge(null)
                .get();
    }

    @Bean
    public IntegrationFlow rabbitToWeb(RabbitTemplate amqpTemplate, ConnectionFactory connectionFactory) {
        return IntegrationFlows.from(Amqp.inboundGateway(connectionFactory, requestQueue()))
                .transform(String.class, String::toUpperCase)
                .log()
                .handle(Amqp.outboundGateway(amqpTemplate).routingKey(outboundQueue))
                .log()
                .bridge(null)
                .get();
    }

    @Bean
    public IntegrationFlow replyBackToHttp(RabbitTemplate amqpTemplate, ConnectionFactory connectionFactory) {
        return IntegrationFlows.from(Amqp.inboundGateway(connectionFactory, targetQueue()))
                .handle(Http.outboundGateway("http://localhost:8080/tunnel")
                       .expectedResponseType(String.class))
                .log()
                .bridge(null)
                .channel(amqpOutboundChannel())
                .get();
    }

    @Bean
    public MessageChannel amqpOutboundChannel() {
    return new DirectChannel();
}

我們還嘗試了以下代碼（由我的同事編寫），但我們也沒有得到響應：

@Configuration
@EnableIntegration
public class FlowConfig {

 

   @Value("${routingKey}")
   private String routingKey;

 

   @Value("${rabbitSinkChannel}")
   private String rabbitSinkChannel;

 

   @Bean
   public MessageChannel rabbitSinkChannel(ConnectionFactory connectionFactory) {
      return
         Amqp
         .channel(rabbitSinkChannel, connectionFactory)
         .get();
   }

 

   @Bean
   public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
      return new RabbitTemplate(connectionFactory);
   }

 

   @Bean
   public IntegrationFlow httpFlow(RabbitTemplate rabbitTemplate, ConnectionFactory connectionFactory) {
      MessageChannel rabbitSinkChannel = rabbitSinkChannel(connectionFactory);

 

      return IntegrationFlows
         .from(
            Http.inboundGateway("/sendreceive")
         )
         .handle(
            Amqp.outboundGateway(rabbitTemplate)
               .routingKey(routingKey)
               .returnChannel(rabbitSinkChannel)
         )
         .channel(rabbitSinkChannel) // or .handle? if so, what?

 

         .get();
   }
}

Answer 1

您可能誤解了returnChannel上的Amqp.outboundGateway是什么，並嘗試依賴您的邏輯。 請熟悉發布者確認和退貨功能： https://docs.spring.io/spring-amqp/docs/current/reference/html/#cf-pub-conf-ret 。

還不清楚什么是replyBackToHttp流目的，但目前它與對其他 bean 的混合引用混淆了。

您可能需要分別從 Spring AMQP 調查什么是請求-回復配置，並且您可能不會嘗試使用另一個隊列進行回復。 雖然它仍然是可能的：請參閱replyAddress屬性或RabbitTemplate ： https://docs.spring.io/spring-amqp/docs/current/reference/html/#request-reply

Answer 2

以下更新有效（我還刪除了 replyBackToHttp() 方法）：

@Bean
public AmqpTemplate amqpTemplate()
{
    RabbitTemplate rabbitTemplate = new RabbitTemplate(rabbitConnectionFactory);
    rabbitTemplate.setMessageConverter(jsonMessageConverter());
    //result.setDefaultReceiveQueue(outboundQueue);
    rabbitTemplate.setReplyAddress(outboundQueue);
    rabbitTemplate.setReplyTimeout(60000);
    rabbitTemplate.setUseDirectReplyToContainer(false);
    return rabbitTemplate;
}

@Bean
public SimpleMessageListenerContainer replyListenerContainer() {
    SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
    container.setConnectionFactory(rabbitConnectionFactory);
    container.setQueues(replyQueue());
    container.setMessageListener((MessageListener) amqpTemplate());
    return container;
}

Answer 3

對於任何感到沮喪並且只想繼續前進的人來說，這是幾乎完整的解決方案。

package com.scdf.poc.config;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.amqp.dsl.Amqp;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.integration.dsl.IntegrationFlows;
import org.springframework.integration.http.dsl.Http;
@Configuration
@EnableIntegration
public class FlowConfig {
   @Value("${rabbitSource}")
   private String rabbitSource;
   @Value("${rabbitSink}")
   private String rabbitSink; // Note: Has to be manually created in rabbit mq, the SCDF flows won't auto create this
   @Bean
   public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
      RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
      rabbitTemplate.setReplyAddress(rabbitSink);
      return rabbitTemplate;
   }
   @Bean
   public SimpleMessageListenerContainer simpleMessageListenerContainer(RabbitTemplate rabbitTemplate, ConnectionFactory connectionFactory) {
      SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
      container.setConnectionFactory(connectionFactory);
      container.setQueueNames(rabbitSink);
      container.setMessageListener(rabbitTemplate);
      return container;
   }
   @Bean
   public IntegrationFlow httpFlow(RabbitTemplate rabbitTemplate) {
      return IntegrationFlows
         .from(
            Http.inboundGateway("/sendreceive")
               .requestPayloadType(String.class)
         )
         .handle(
            Amqp.outboundGateway(rabbitTemplate)
               .routingKey(rabbitSource)
         )
         .get();
   }
}

application.properties - 注意 SCDF 使用 stream 名稱作為隊列名稱的前綴和后綴

rabbitSource=pocStream.rabbitSource.pocStream
rabbitSink=pocStream.rabbitSink.pocStream

pocStream 的 SCDF stream 定義 - 這只是回顯請求

rabbitSource: rabbit --queues=rabbitSource | bridge | rabbitSink: rabbit --routing-key=pocStream.rabbitSink.pocStream