网关路由配置解析

1. gateway配置

server:
  port: 9001


spring:
  application:
    name: platform-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
          lower-case-service-id: true
      routes:
        - id: platform-service111
          uri: lb://platform-service
          predicates:
            - Path=/platform-service/**
        - id: platform-redis222
          uri: lb://platform-redis
          predicates:
            - Path=/platform-redis/**

      default-filters:   # 配置跨域,header去重
        - DedupeResponseHeader=Vary Access-Control-Allow-Credentials Access-Control-Allow-Origin, RETAIN_UNIQUE
        - DedupeResponseHeader=Access-Control-Allow-Origin, RETAIN_FIRST
        - AddResponseHeader=Access-Control-Allow-Credentials,true



eureka:
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
  client:
    service-url:
      register-with-eureka: true
      fetch-registy: true
      defaultZone: http://172.10.101.123:7001/eureka/


gateway动态路由规则

cloud:
    gateway:
      discovery:
        locator:
          enabled: true
          lower-case-service-id: true

使用这部分配置即可实现微服务名称自动进行动态路由配置,不需要再进行routes配置。

gateway的Path路径匹配规则

	routes:
        - id: platform-service111
          uri: lb://platform-service
          predicates:
            - Path=/user/**

断言规则:platform-service-ip:port/user/** = gateway-ip:port/user/**

2.整合swagger

  1. 首先需要两个类:SwaggerResourcesConfig和SwaggerResourceController
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourcesConfig implements SwaggerResourcesProvider {
    public static final String API_URI = "/v2/api-docs";
    private final RouteLocator routeLocator;
    private final GatewayProperties gatewayProperties;

    /**
     * 这个类是核心,这个类封装的是SwaggerResource,即在swagger-ui.html页面中顶部的选择框,选择服务的swagger页面内容。
     * RouteLocator:获取spring cloud gateway中注册的路由
     * RouteDefinitionLocator:获取spring cloud gateway路由的详细信息
     * RestTemplate:获取各个配置有swagger的服务的swagger-resources
     */
    @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("3.0.0");
        return swaggerResource;
    }
}
@RestController
@RequestMapping("/swagger-resources")
public class SwaggerResourceController {
    @Autowired
    private SwaggerResourcesConfig swaggerResources;

    @Autowired(required = false)
    private SecurityConfiguration securityConfiguration;

    @Autowired(required = false)
    private UiConfiguration uiConfiguration;

    @Autowired
    public SwaggerResourceController(SwaggerResourcesConfig 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)));
    }
}
  1. 通过SwaggerResourcesConfig 知道,我们需要再gateway中配置routes
routes:
  - id: platform-service111
    uri: lb://platform-service
    predicates:
      - Path=/platform-service/**
  - id: platform-redis222
    uri: lb://platform-redis
    predicates:
      - Path=/platform-redis/**

参考SwaggerResourcesConfig 中的配置,可以知道id是swagger-ui.html页面中顶部的选择框的内容。

当我们切换选择框中的id时,会自动进行路由匹配。在这里又涉及到一个微服务进行动态路由转发的问题:

  • 网关请求的路径为http://localhost:9001/platform-service/v2/api-docs,但实际*问的是http://localhost:8001/v2/api-docs,这里是localhost:9001/platform-service/覆盖localhost:8001/
    我猜想这是因为我们在前面通过enabled: true配置了动态路由转发,swagger配置类中结合了Path的路径拼接成了/localhost:9001/platform-service/v2/api-docs。但是这里并没有走uri+predicates的路径,所以没有出现路径错误的问题。(所以这里的route是针对swagger的路由设置的,不是gateway动态路由转发的路由配置)
    网关路由配置解析
    (上图中显示的BaseURL说明是走的 locator 路由)
  • 还有一种情况是:比如我们不通过网关,直接访问微服务的swagger地址为:localhost:8001/ps/v2/api-docs;然后我们配置文件中这样写:
routes:
  - id: platform-service111
    uri: lb://platform-service
    predicates:
      - Path=/ps/**

网关路由配置解析
(上图中显示的BaseURL说明是走的 routes 路由)
根据路由规则,localhost:9001/ps/** = localhost:8001/ps/** 此时就是只是9001掩盖了8001。
swagger的配置类帮我们拼接了路径:/ps/v2/api-docs
因为这里路径中不是http://localhost:9001/platform-service/,自然不会进行动态路由转发,所有就只是简单的走uri+predicates匹配规则
但是第一种情况是因为开启了动态路由配置,刚好Path的断言规则恰好是它的微服务名称

究极总结:

  1. 配置routes是为了方便swagger选择,通过id进行切换
  2. 由于配置了 locator 会自动进行微服务名进行路由,所以当断言为- Path=/platform-service/**,swagger配置类会进行路径拼接,拼接成http://localhost:9001/platform-service/**,这个时候呢,它走的就不是routes定义的路由匹配了,它走的是 locator 开启的自动根据微服务名进行路由匹配了。
  3. 当断言为- Path=/ps/**,swagger配置类拼接的成的路径为http://localhost:9001/ps/**,因为此时9001跟的不是微服务名称,不能触发 locator 的自动路由匹配,这个时候呢,它走的就不是 locator了,它走的是routes开启的路由匹配。

参考:Spring Cloud Gateway整合Swagger聚合微服务系统API文档(非Zuul) 这篇文章和我的理解又出入,不能理解- Path=/admin/**,他的微服务下面根本没有admin这个路径,怎么匹配的到呢

3.gateway处理跨域

spring cloud Gateway 处理跨域问题
spring gateway解决跨域问题
springcloud gateway解决跨域问题

@Configuration
public class CorsConfig implements WebFluxConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        /**
         * 允许路径
         * 允许跨域访问的源
         * 允许请求地方法
         * 预检间隔时间
         * 允许头部设置
         * 是否发送cookie
         */
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
                .maxAge(10000)
                .allowedHeaders("*")
                .allowCredentials(true);
    }
}

网关路由配置解析

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