java - 如何使用Spring Boot RSocket服务器支持WebSocket传输？

TLDR:要配置一个Spring Boot应用程序以显示支持WebSocket传输的RSocket接口(interface)，需要做些什么？

我同时学习RSocket和Spring Boot，所以请多多包涵。

在我的奋斗中，我能够构建一个非常简单且人为设计的Spring Boot应用程序实现，该实现使用由第二个Spring Boot应用程序使用RSocket作为协议(protocol)提供/公开的API，但是，我只能在以下情况下实现此目的使用TcpClientTransport。

从我的角度来看，WebsocketTransport在客户端->服务器体系结构中更可能被使用并且更有用，但是，我还没有找到任何有效的示例或文档来说明如何正确配置使用WebSocket接受RSocket消息的Spring Boot应用程序。作为交通工具。

奇怪的是，在我的测试中，我的使用者(客户端)似乎确实建立了到服务器/生产者的WebSocket连接，但是，“握手”似乎挂起，并且从未完全建立连接。我已经使用JavaScript库(rsocket-websocket-client，rsocket-rpc-core等)和Java库(io.rsocket.transport.netty.client.WebsocketClientTransport)进行了测试，并且服务器似乎表现出相同的效果行为不分。

重申一下，使用TCPTransport我可以连接到服务器并调用请求，但是使用WebsocketTransport时，从未建立连接。

旨在通过WebsocketClientTransport支持RSocket的Spring Boot应用程序有什么要求，而过去将spring-boot-starter-rsocket作为依赖项使用了呢？

服务器

pom.xml

...

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.0.M5</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

...

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-rsocket</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
</dependencies>

...

application.properties

spring.rsocket.server.port=8081
management.endpoints.enabled-by-default=true
management.endpoints.web.exposure.include=*

SpringBootRSocketServerApplication.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootRSocketServerApplication {

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

UserRSocketController

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.stereotype.Controller;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.time.Duration;
import java.util.List;
import java.util.Random;
import java.util.stream.Stream;

@Slf4j
@Controller
public class UserRSocketController {

    @Autowired
    private UserRepository userRepository;

    @MessageMapping("usersList")
    public Mono<List<User>> usersList() {
        log.info("Handling usersList request.");
        return Mono.just(this.userRepository.getUsers());
    }

    @MessageMapping("usersStream")
    Flux<User> usersStream(UserStreamRequest request) {
        log.info("Handling request for usersStream.");
        List<User> users = userRepository.getUsers();
        Stream<User> userStream = Stream.generate(() -> {
            Random rand = new Random();
            return users.get(rand.nextInt(users.size()));
        });
        return Flux.fromStream(userStream).delayElements(Duration.ofSeconds(1));
    }

    @MessageMapping("userById")
    public Mono<User> userById(GetUserByIdRequest request) {
        log.info("Handling request for userById id: {}.", request.getId());
        return Mono.just(this.userRepository.getUserById(request.getId()));
    };
}

启动记录

 :: Spring Boot ::             (v2.2.0.M5)

2019-09-08 21:40:02,986 INFO  [main] org.springframework.boot.StartupInfoLogger: Starting SpringBootRSocketServerApplication on REDACTED with PID 22540 (REDACTED)
2019-09-08 21:40:02,988 INFO  [main] org.springframework.boot.SpringApplication: No active profile set, falling back to default profiles: default
2019-09-08 21:40:04,103 INFO  [main] org.springframework.boot.actuate.endpoint.web.EndpointLinksResolver: Exposing 14 endpoint(s) beneath base path '/actuator'
2019-09-08 21:40:04,475 INFO  [main] org.springframework.boot.rsocket.netty.NettyRSocketServer: Netty RSocket started on port(s): 8081
2019-09-08 21:40:04,494 INFO  [main] org.springframework.boot.web.embedded.netty.NettyWebServer: Netty started on port(s): 8080
2019-09-08 21:40:04,498 INFO  [main] org.springframework.boot.StartupInfoLogger: Started SpringBootRSocketServerApplication in 1.807 seconds (JVM running for 2.883)

消费者/客户

ClientConfiguration.java

import io.rsocket.RSocket;
import io.rsocket.RSocketFactory;
import io.rsocket.frame.decoder.PayloadDecoder;
import io.rsocket.transport.ClientTransport;
//import io.rsocket.transport.netty.client.TcpClientTransport;
import io.rsocket.transport.netty.client.WebsocketClientTransport;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.rsocket.MetadataExtractor;
import org.springframework.messaging.rsocket.RSocketRequester;
import org.springframework.messaging.rsocket.RSocketStrategies;
import org.springframework.util.MimeTypeUtils;

@Configuration
public class ClientConfiguration {

    @Bean
    public RSocket rSocket() {
        // ClientTransport transport = TcpClientTransport.create(8081);
        // ^--- TCPTransport works fine

        ClientTransport transport = WebsocketClientTransport.create(8081);
        // ^--- Connection hangs and application startup stalls

        return RSocketFactory
            .connect()
            .mimeType(MetadataExtractor.ROUTING.toString(), MimeTypeUtils.APPLICATION_JSON_VALUE)
            .frameDecoder(PayloadDecoder.ZERO_COPY)
            .transport(transport)
            .start()
            .block();
    }

    @Bean
    RSocketRequester rSocketRequester(RSocketStrategies rSocketStrategies) {
        return RSocketRequester.wrap(rSocket(), MimeTypeUtils.APPLICATION_JSON, MimeTypeUtils.APPLICATION_JSON, rSocketStrategies);
    }
}

启动记录

 :: Spring Boot ::             (v2.2.0.M5)

2019-09-08 21:40:52,331 INFO  [main] org.springframework.boot.StartupInfoLogger: Starting SpringBootRsocketConsumerApplication on REDACTED with PID 18904 (REDACTED)
2019-09-08 21:40:52,334 INFO  [main] org.springframework.boot.SpringApplication: No active profile set, falling back to default profiles: default

最佳答案

您只需要两件事就可以使RSocket应用程序使用websocket传输公开端点:

首先，您需要webflux和rsocket依赖，因为您可能还需要提供网页和静态资源:

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-rsocket</artifactId>
    </dependency>

然后，您需要在application.properties文件中相应地配置RSocket服务器:

#server.port=8080 this is already the default
spring.rsocket.server.transport=websocket
spring.rsocket.server.mapping-path=/rsocket

您可以在Spring Boot reference documentation about RSocket中找到有关此内容的更多信息。

Websocket客户端现在可以连接到ws://localhost:8080/rsocket。

请注意，从当前的2.2.0 SNAPSHOT开始，RSocket协议(protocol)已得到发展，并且rsocket-js库当前正在发展，尤其是在元数据支持方面。您会发现a working sample here as well。

在Java客户端方面，Spring Boot为您提供了一个RSocketRequester.Builder，它已经使用编解码器和拦截器针对您的需要进行了配置和自定义:

@Component
public class MyService {

    private final RSocketRequester rsocketRequester;

    public MyService(RSocketRequester.Builder builder) {
        this.rsocketRequester = builder
                .connectWebSocket(URI.create("ws://localhost:8080/rsocket"))
                .block();
    }
}