srping cloud gateway 版本: 2.0.2
自动配置类列表spring.factories
# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.springframework.cloud.gateway.config.GatewayClassPathWarningAutoConfiguration,\
org.springframework.cloud.gateway.config.GatewayAutoConfiguration,\
org.springframework.cloud.gateway.config.GatewayLoadBalancerClientAutoConfiguration,\
org.springframework.cloud.gateway.config.GatewayMetricsAutoConfiguration,\
org.springframework.cloud.gateway.config.GatewayRedisAutoConfiguration,\
org.springframework.cloud.gateway.discovery.GatewayDiscoveryClientAutoConfiguration
- GatewayClassPathWarningAutoConfiguration
依赖检查类 - GatewayAutoConfiguration
主配置类 - GatewayLoadBalancerClientAutoConfiguration
负载均衡客户端配置 - GatewayMetricsAutoConfiguration
度量配置 - GatewayRedisAutoConfiguration
redis配置 - GatewayDiscoveryClientAutoConfiguration
自动发现客户端配置
GatewayClassPathWarningAutoConfiguration
这个主要是检查:
- 如果有spring-boot-starter-web, 提示移除
- 如果没有spring-boot-starter-webflux 提示添加
GatewayLoadBalancerClientAutoConfiguration
依赖RibbonAutoConfiguration创建的LoadBalancerClient
使用LoadBalancerClient创建了LoadBalancerClientFilter
GatewayDiscoveryClientAutoConfiguration
创建List<PredicateDefinition>: lb://+serviceId
创建List<FilterDefinition> : RewritePath '/' + serviceId + '/(?<remaining>.*)' => '/${remaining}'
创建DiscoveryLocatorProperties
创建DiscoveryClientRouteDefinitionLocator
GatewayMetricsAutoConfiguration
创建GatewayMetricsFilter过滤器
RedisAutoConfiguration
创建redisTemplate
GatewayAutoConfiguration
@Configuration
//spring.cloud.gateway.enabled 决定是否打开网关, 默认打开
@ConditionalOnProperty(name = "spring.cloud.gateway.enabled", matchIfMissing = true)
@EnableConfigurationProperties
@AutoConfigureBefore(HttpHandlerAutoConfiguration.class)
@AutoConfigureAfter({ GatewayLoadBalancerClientAutoConfiguration.class,
GatewayClassPathWarningAutoConfiguration.class })
@ConditionalOnClass(DispatcherHandler.class)
创建NettyConfiguration
- 创建HttpClientProperties
- 创建nettyClientOptions: connectTimeout, ssl, pool, proxy
- 创建HttpClient
- 创建NettyRoutingFilter
- 创建NettyWriteResponseFilter
- 创建ReactorNettyWebSocketClient
创建HiddenHttpMethodFilter
创建RouteLocatorBuilder
创建GatewayProperties
这里从属性文件中创建路由器配置和默认过滤器配置:
List<RouteDefinition> routes ;
List<FilterDefinition> defaultFilters ;
List<MediaType> streamingMediaTypes ;
创建 PropertiesRouteDefinitionLocator
PropertiesRouteDefinitionLocator实现了RouteDefinitionLocator, 保存了从GatewayProperties获取的RouteDefinition
创建 InMemoryRouteDefinitionRepository
InMemoryRouteDefinitionRepository 实现了RouteDefinitionLocator, 保存了运行时创建的RouteDefinition
创建CompositeRouteDefinitionLocator(Primary RouteDefinitionLocator)
合并InMemoryRouteDefinitionRepository,PropertiesRouteDefinitionLocator,
DiscoveryClientRouteDefinitionLocator 及任何自定义的RouteDefinitionLocator
创建RouteLocator
@Bean
public RouteLocator routeDefinitionRouteLocator(GatewayProperties properties,
List<GatewayFilterFactory> GatewayFilters,
List<RoutePredicateFactory> predicates,
RouteDefinitionLocator routeDefinitionLocator) {
return new RouteDefinitionRouteLocator(routeDefinitionLocator, predicates, GatewayFilters, properties);
}
使用GatewayProperties+所有的GatewayFilterFactory+所有的RoutePredicateFactory + 上面创建的CompositeRouteDefinitionLocator
创建路由器列表RouteDefinitionRouteLocator
创建CachingRouteLocator (Primary RouteLocator)
使用CachingRouteLocator包装RouteDefinitionRouteLocator
创建RouteRefreshListener
监听上下文事件, 必要时刷新CachingRouteLocator的缓存
创建GlobalCorsProperties
全局跨域访问配置
创建FilteringWebHandler
过滤器处理核心类, 在这里组装过滤器链.
创建RoutePredicateHandlerMapping
请求处理核心类, 使用FilteringWebHandler+RouteLocator+GlobalCorsProperties+Environment 创建, 所有的请求处理都在这里组装.
创建SecureHeadersProperties
http头部和安全相关的配置
创建ForwardedHeadersFilter 过滤器
创建RemoveHopByHopHeadersFilter过滤器
创建XForwardedHeadersFilter过滤器
创建全局过滤器
- AdaptCachedBodyGlobalFilter
- RouteToRequestUrlFilter
- ForwardRoutingFilter
- ForwardPathFilter
- WebsocketRoutingFilter
- WeightCalculatorWebFilter
创建predicate factory
- AfterRoutePredicateFactory
- BeforeRoutePredicateFactory
- BetweenRoutePredicateFactory
- CookieRoutePredicateFactory
- HeaderRoutePredicateFactory
- HostRoutePredicateFactory
- MethodRoutePredicateFactory
- PathRoutePredicateFactory
- QueryRoutePredicateFactory
- ReadBodyPredicateFactory
- RemoteAddrRoutePredicateFactory
- WeightRoutePredicateFactory
- CloudFoundryRouteServiceRoutePredicateFactory
创建内置过滤器
- AddRequestHeaderGatewayFilterFactory
- AddRequestParameterGatewayFilterFactory
- AddResponseHeaderGatewayFilterFactory
- HystrixGatewayFilterFactory
- ModifyRequestBodyGatewayFilterFactory
- ModifyResponseBodyGatewayFilterFactory
- PrefixPathGatewayFilterFactory
- PreserveHostHeaderGatewayFilterFactory
- RedirectToGatewayFilterFactory
- RemoveRequestHeaderGatewayFilterFactory
- RemoveResponseHeaderGatewayFilterFactory
- RequestRateLimiterGatewayFilterFactory
- RewritePathGatewayFilterFactory
- RetryGatewayFilterFactory
- SetPathGatewayFilterFactory
- SecureHeadersGatewayFilterFactory
- SetRequestHeaderGatewayFilterFactory
- SetResponseHeaderGatewayFilterFactory
- SetStatusGatewayFilterFactory
- SaveSessionGatewayFilterFactory
- StripPrefixGatewayFilterFactory
- RequestHeaderToRequestUriGatewayFilterFactory
创建gatewayControllerEndpoint
总结
spring cloud gateway的创建是比较复杂的, 核心类是GatewayAutoConfiguration, 它做了以下几件事:
- 配置了Netty
- 创建GatewayProperties, 这里从属性文件中获取了路由器定义和默认过滤器定义
- 创建了属性RouteDefinitionLocator, 内存RouteDefinitionLocator和自动发现服务RouteDefinitionLocator, 并且将这三者合并为CompositeRouteDefinitionLocator
- 使用GatewayProperties+所有的GatewayFilterFactory,RoutePredicateFactory+CompositeRouteDefinitionLocator创建路由器列表RouteLocator, 这个东西包含所有.
- 创建了一批全局过滤器
- 创建过滤器处理类 FilteringWebHandler
- 创建请求处理类 RoutePredicateHandlerMapping
