springcloud整合Resilience4j springcloud整合swagger

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mob64ca13faa4e6 2024-06-19 04:49:50

文章标签 Gateway Swagger Swagger 文章分类 架构后端开发

【源码中的Spring Boot版本为2.1.3，更新了一点小细节，主要是看思路吧】最近在学习SpringBoot2和Spring Cloud.Finchley版，网上资料也是少的可怜，大部分还是通过一些github或者码云上的一些开源框架来学习，途中出现的一些bug也只能自己看看源码尝试解决。最近使用Spring Cloud Gateway替换Zuul的时候发现Swagger并不支持以WebFlux为底层的Gateway，无法集成，运行报错。下面分享我愚钝的解决思路，和关键代码，若有改进之处，望大佬指点，详细代码可以下载源码查看。

贴上源码https://gitee.com/wxdfun/sw

首先是子项目Spring Boot项目正常集成Swagger。在业务项目Admin中添加Swagger依赖包（使用Eureka为注册中心，文章未展示多余部分）。

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
</dependency>

添加测试Controller。

@RestController
@RequestMapping("/test")
@Api("测试")
public class TestController {

    @ApiOperation(value = "计算+", notes = "加法")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "a", paramType = "path", value = "数字a", required = true, dataType = "Long"),
            @ApiImplicitParam(name = "b", paramType = "path", value = "数字b", required = true, dataType = "Long")
    })
    @GetMapping("/{a}/{b}")
    public Integer get(@PathVariable Integer a, @PathVariable Integer b) {
        return a + b;
    }
}

配置Swagger使API注解生效。

@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                .paths(PathSelectors.any())
                .build();
    }
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("Swagger API")
                .description("test")
                .termsOfServiceUrl("")
                .contact(new Contact("wd", "", ""))
                .version("2.0")
                .build();
    }
}

此时启动Admin项目后应该能正常访问admin-ip:admin:port/swagger-ui.html。下面是网关gateway部分。

建立网关项目gateway，添加核心依赖包

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis-reactive</artifactId>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
</dependency>

添加gateway路由配置

server:
  port: 3333

spring:
  application:
    name: wd-gateway
  cloud:
      gateway:
        locator:
          enabled: true
        routes:
        - id: wd-admin
          uri: lb://wd-admin
          predicates:
          - Path=/admin/**
          filters:
          - SwaggerHeaderFilter
          - StripPrefix=1

eureka:
  instance:
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://localhost:8060/eureka/

因为Swagger暂不支持webflux项目，所以Gateway里不能配置SwaggerConfig，也就是说Gateway无法提供自身API。但我想一般也不会在网关项目代码里写业务API代码吧。。所以这里的集成只是基于基于WebMvc的微服务项目。

配置SwaggerProvider，获取Api-doc，即SwaggerResources。

@Component
@Primary
@AllArgsConstructor
public class SwaggerProvider implements SwaggerResourcesProvider {
    public static final String API_URI = "/v2/api-docs";
    private final RouteLocator routeLocator;
    private final GatewayProperties gatewayProperties;


    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        //取出gateway的route
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        //结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
        gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                        .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                        .forEach(predicateDefinition -> resources.add(swaggerResource(routeDefinition.getId(),
                                predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                        .replace("/**", API_URI)))));
        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }
}

因为Gateway里没有配置SwaggerConfig，而运行Swagger-ui又需要依赖一些接口，所以我的想法是自己建立相应的swagger-resource端点。

@RestController
@RequestMapping("/swagger-resources")
public class SwaggerHandler {
    @Autowired(required = false)
    private SecurityConfiguration securityConfiguration;
    @Autowired(required = false)
    private UiConfiguration uiConfiguration;
    private final SwaggerResourcesProvider swaggerResources;

    @Autowired
    public SwaggerHandler(SwaggerResourcesProvider swaggerResources) {
        this.swaggerResources = swaggerResources;
    }


    @GetMapping("/configuration/security")
    public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration() {
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

    @GetMapping("/configuration/ui")
    public Mono<ResponseEntity<UiConfiguration>> uiConfiguration() {
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(uiConfiguration).orElse(UiConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

    @GetMapping("")
    public Mono<ResponseEntity> swaggerResources() {
        return Mono.just((new ResponseEntity<>(swaggerResources.get(), HttpStatus.OK)));
    }
}

【Spring Boot版本超过2.0.6的应该可以跳过这一步，最新源码也更新了。Spring修复了bug给我们添加上了这个Header】另外，我发现在路由为admin/test/{a}/{b}，在swagger会显示为test/{a}/{b}，缺少了admin这个路由节点。断点源码时发现在Swagger中会根据X-Forwarded-Prefix这个Header来获取BasePath，将它添加至接口路径与host中间，这样才能正常做接口测试，而Gateway在做转发的时候并没有这个Header添加进Request，所以发生接口调试的404错误。解决思路是在Gateway里加一个过滤器来添加这个header。

//@Component
public class SwaggerHeaderFilter extends AbstractGatewayFilterFactory {
    private static final String HEADER_NAME = "X-Forwarded-Prefix";

    @Override
    public GatewayFilter apply(Object config) {
        return (exchange, chain) -> {
            ServerHttpRequest request = exchange.getRequest();
            String path = request.getURI().getPath();
            if (!StringUtils.endsWithIgnoreCase(path, SwaggerProvider.API_URI)) {
                return chain.filter(exchange);
            }
            String basePath = path.substring(0, path.lastIndexOf(SwaggerProvider.API_URI));
            ServerHttpRequest newRequest = request.mutate().header(HEADER_NAME, basePath).build();
            ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
            return chain.filter(newExchange);
        };
    }
}

在配置文件中为admin节点添加过滤器生效

routes:
        - id: wd-admin
          uri: lb://wd-admin
          predicates:
          - Path=/admin/**
          filters:
          - SwaggerHeaderFilter
          - StripPrefix=1

这时启动Gateway，访问gateway-ip:gateway-port/swagger-ui.html时，即可正常使用swagger。大家可以多加几个API服务试试效果

最后附上效果图

springcloud整合Resilience4j springcloud整合swagger_Swagger