为什么80%的码农都做不了架构师？>>> 
在微服务架构下，通常每个微服务都会使用Swagger来管理我们的接口文档，当微服务越来越多，接口查找管理无形中要浪费我们不少时间，毕竟懒是程序员的美德。
由于swagger2暂时不支持webflux 走了很多坑，完成这个效果感谢 @dreamlu @世言。
文档聚合效果
通过访问网关的 host:port/swagger-ui.html，即可实现: pig聚合文档效果预览传送门
通过右上角的Select a spec 选择服务模块来查看swagger文档
Pig的Zuul 核心实现
获取到zuul配置的路由信息，主要到SwaggerResource
/**
* 参考jhipster
* GatewaySwaggerResourcesProvider
*/
@Component
@Primary
public class RegistrySwaggerResourcesProvider implements SwaggerResourcesProvider {
private final RouteLocator routeLocator;
public RegistrySwaggerResourcesProvider(RouteLocator routeLocator) {
this.routeLocator = routeLocator;
}
@Override
public List get() {
List resources = new ArrayList<>();
List routes = routeLocator.getRoutes();
routes.forEach(route -> {
//授权不维护到swagger
if (!StringUtils.contains(route.getId(), ServiceNameConstant.AUTH_SERVICE)){
resources.add(swaggerResource(route.getId(), route.getFullPath().replace("**", "v2/api-docs")));
}
});
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;
}
}
PigX的Spring Cloud Gateway 实现
注入路由到SwaggerResource
@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 get() {
List resources = new ArrayList<>();
List routes = new ArrayList<>();
routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
.forEach(routeDefinition -> routeDefinition.getPredicates().stream()
.filter(predicateDefinition -> "Path".equalsIgnoreCase(predicateDefinition.getName()))
.filter(predicateDefinition -> !"pigx-auth".equalsIgnoreCase(routeDefinition.getId()))
.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;
}
}
提供swagger 对外接口配置
@Slf4j
@Configuration
@AllArgsConstructor
public class RouterFunctionConfiguration {
private final SwaggerResourceHandler swaggerResourceHandler;
private final SwaggerSecurityHandler swaggerSecurityHandler;
private final SwaggerUiHandler swaggerUiHandler;
@Bean
public RouterFunction routerFunction() {
return RouterFunctions.route(
.andRoute(RequestPredicates.GET("/swagger-resources")
.and(RequestPredicates.accept(MediaType.ALL)), swaggerResourceHandler)
.andRoute(RequestPredicates.GET("/swagger-resources/configuration/ui")
.and(RequestPredicates.accept(MediaType.ALL)), swaggerUiHandler)
.andRoute(RequestPredicates.GET("/swagger-resources/configuration/security")
.and(RequestPredicates.accept(MediaType.ALL)), swaggerSecurityHandler);
}
}
业务handler 的实现
@Override
public Mono handle(ServerRequest request) {
return ServerResponse.status(HttpStatus.OK)
.contentType(MediaType.APPLICATION_JSON_UTF8)
.body(BodyInserters.fromObject(swaggerResources.get()));
}
@Override
public Mono handle(ServerRequest request) {
return ServerResponse.status(HttpStatus.OK)
.contentType(MediaType.APPLICATION_JSON_UTF8)
.body(BodyInserters.fromObject(
Optional.ofNullable(securityConfiguration)
.orElse(SecurityConfigurationBuilder.builder().build())));
}
@Override
public Mono handle(ServerRequest request) {
return ServerResponse.status(HttpStatus.OK)
.contentType(MediaType.APPLICATION_JSON_UTF8)
.body(BodyInserters.fromObject(
Optional.ofNullable(uiConfiguration)
.orElse(UiConfigurationBuilder.builder().build())));
}
swagger路径转换
通过以上配置，可以实现文档的参考和展示了，但是使用swagger 的 try it out 功能发现路径是路由切割后的路径比如：
swagger 文档中的路径为： 主机名：端口：映射路径 少了一个 服务路由前缀，是因为展示handler 经过了 StripPrefixGatewayFilterFactory 这个过滤器的处理，原有的 路由前缀被过滤掉了！
方案1，通过swagger 的host 配置手动维护一个前缀
return new Docket(DocumentationType.SWAGGER_2)
.apiInfo(apiInfo())
.host("主机名：端口：服务前缀") //注意这里的主机名：端口是网关的地址和端口
.select()
.apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
.paths(PathSelectors.any())
.build()
.globalOperationParameters(parameterList);
方案2，增加X-Forwarded-Prefix
swagger 在拼装URL 数据时候，会增加X-Forwarder-Prefix 请求头里面的信息为前缀
通过如上分析，知道应该在哪里下手了吧，在 网关上追加一个请求头即可
@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);
};
}
}
总结
-
相对zuul的实现，核心逻辑都是一样，获取到配置路由信息，重写swaggerresource
-
gateway的配置稍微麻烦，资源的提供handler，swagger url 重写的细节
-
源码获取：最新Spring Cloud 技术栈，基于Spring Cloud Finchley.RELEASE、oAuth2 实现的权限系统