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

  
    
      org.springframework.cloud
      spring-cloud-starter
    
    
      org.springframework.cloud
      spring-cloud-gateway-core
    
    
      org.springframework.boot
      spring-boot-starter-webflux
    
  

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> routes() {
    return this.routeLocator.getRoutes().map(this::serialize);
  }

  @GetMapping("/routes/{id}")
  public Mono>> route(@PathVariable String id) {
    //......
  }
//以下方法是继承于父类,抽象类AbstractGatewayControllerEndpoint
  @PostMapping("/refresh")
  public Mono refresh() {
    this.publisher.publishEvent(new RefreshRoutesEvent(this));
    return Mono.empty();
  }

  @GetMapping("/globalfilters")
  public Mono> globalfilters() {
    return getNamesToOrders(this.globalFilters);
  }

  @GetMapping("/routefilters")
  public Mono> routefilers() {
    return getNamesToOrders(this.GatewayFilters);
  }

  @GetMapping("/routepredicates")
  public Mono> routepredicates() {
    return getNamesToOrders(this.routePredicates);
  }
  @PostMapping("/routes/{id}")
  @SuppressWarnings("unchecked")
  public Mono> save(@PathVariable String id,
      @RequestBody RouteDefinition route) {}
  @DeleteMapping("/routes/{id}")
  public Mono> 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> 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")
@Validated
public class GatewayProperties {

  /**
   * List of Routes.
   */
  @NotNull
  @Valid
  private List routes = new ArrayList<>();

  /**
   * List of filter definitions that are applied to every route.
   */
  private List defaultFilters = new ArrayList<>();

  private List 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脚本之家。