Spring cloud gateway工作流程原理解析

spring cloud gateway的包结构(在Idea 2019.3中展示)

这个包是spring-cloud-gateway-core.这里是真正的spring-gateway的实现的地方.

为了证明,我们打开spring-cloud-starter-gateway的pom文件

<dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-gateway-core</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-webflux</artifactId> </dependency> </dependencies>

除了cloud-start,starter-webflux就是cloud-gateway-core.所以后面我们就分析

cloud-gateway-core这个jar包.

其中actuate中定义了GatewayControllerEndpoint,它提供了对外访问的接口.

// TODO: Flush out routes without a definition @GetMapping('/routes') public Flux<Map<String, Object>> routes() { return this.routeLocator.getRoutes().map(this::serialize); } @GetMapping('/routes/{id}') public Mono<ResponseEntity<Map<String, Object>>> route(@PathVariable String id) { //...... }//以下方法是继承于父类,抽象类AbstractGatewayControllerEndpoint @PostMapping('/refresh') public Mono<Void> refresh() { this.publisher.publishEvent(new RefreshRoutesEvent(this)); return Mono.empty(); } @GetMapping('/globalfilters') public Mono<HashMap<String, Object>> globalfilters() { return getNamesToOrders(this.globalFilters); } @GetMapping('/routefilters') public Mono<HashMap<String, Object>> routefilers() { return getNamesToOrders(this.GatewayFilters); } @GetMapping('/routepredicates') public Mono<HashMap<String, Object>> routepredicates() { return getNamesToOrders(this.routePredicates); } @PostMapping('/routes/{id}') @SuppressWarnings('unchecked') public Mono<ResponseEntity<Object>> save(@PathVariable String id, @RequestBody RouteDefinition route) {} @DeleteMapping('/routes/{id}') public Mono<ResponseEntity<Object>> delete(@PathVariable String id) { return this.routeDefinitionWriter.delete(Mono.just(id)).then(Mono.defer(() -> Mono.just(ResponseEntity.ok().build()))).onErrorResume(t -> t instanceof NotFoundException, t -> Mono.just(ResponseEntity.notFound().build())); } @GetMapping('/routes/{id}/combinedfilters') public Mono<HashMap<String, Object>> combinedfilters(@PathVariable String id) { // TODO: missing global filters }

config包里定义了一些Autoconfiguration和一些properties.读取配置文件就在这里完成.

我们这里看一下GatewayProperties.java

@ConfigurationProperties('spring.cloud.gateway')@Validatedpublic class GatewayProperties { /** * List of Routes. */ @NotNull @Valid private List<RouteDefinition> routes = new ArrayList<>(); /** * List of filter definitions that are applied to every route. */ private List<FilterDefinition> defaultFilters = new ArrayList<>(); private List<MediaType> streamingMediaTypes = Arrays .asList(MediaType.TEXT_EVENT_STREAM, MediaType.APPLICATION_STREAM_JSON); #该类包括三个属性,路由列表,默认过滤器列表和MediaType列表.路由列表中的路由定义RouteDefinition. 过滤器中定义的FilterDefinition.

discovery定义了注册中心的一些操作.

event定义了一系列事件,都继承自ApplicationEvent.

filter定义了spring gateway实现的一些过滤器,包括gatewayfilter,globalfilter.

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。