006-spring cloud gateway-GatewayAutoConfiguration核心配置-GatewayProperties初始化加載、Route初始化加載

時間  2019-11-10
標籤 spring cloud gateway gatewayautoconfiguration 核心 配置 gatewayproperties 初始化 加載 route 欄目 Spring 简体版
原文   原文鏈接

1、GatewayProperties

1.一、在GatewayAutoConfiguration中加載

　　在Spring-Cloud-Gateway初始化時，同時GatewayAutoConfiguration核心配置類會被初始化加載以下 ：html

NettyConfiguration 底層通訊netty配置
GlobalFilter （AdaptCachedBodyGlobalFilter，RouteToRequestUrlFilter，ForwardRoutingFilter，ForwardPathFilter，WebsocketRoutingFilter，WeightCalculatorWebFilter等）
FilteringWebHandler
GatewayProperties
PrefixPathGatewayFilterFactory
RoutePredicateFactory
RouteDefinitionLocator
RouteLocator
RoutePredicateHandlerMapping 查找匹配到 Route並進行處理
GatewayWebfluxEndpoint 管理網關的 HTTP API

　　其中在GatewayAutoConfiguration配置加載中含初始化加載GatewayProperties實例的配置：java

查看GatewayAutoConfiguration源碼：react

    @Bean
    public GatewayProperties gatewayProperties() {
        return new GatewayProperties();
    }

1.二、再次查看GatewayProperties源碼：web

@ConfigurationProperties("spring.cloud.gateway")
@Validated
public class GatewayProperties {
    @NotNull
    @Valid
    private List<RouteDefinition> routes = new ArrayList();
    private List<FilterDefinition> defaultFilters = new ArrayList();
    private List<MediaType> streamingMediaTypes;

    public GatewayProperties() {
        this.streamingMediaTypes = Arrays.asList(MediaType.TEXT_EVENT_STREAM, MediaType.APPLICATION_STREAM_JSON);
    }

    public List<RouteDefinition> getRoutes() {
        return this.routes;
    }

    public void setRoutes(List<RouteDefinition> routes) {
        this.routes = routes;
    }

    public List<FilterDefinition> getDefaultFilters() {
        return this.defaultFilters;
    }

    public void setDefaultFilters(List<FilterDefinition> defaultFilters) {
        this.defaultFilters = defaultFilters;
    }

    public List<MediaType> getStreamingMediaTypes() {
        return this.streamingMediaTypes;
    }

    public void setStreamingMediaTypes(List<MediaType> streamingMediaTypes) {
        this.streamingMediaTypes = streamingMediaTypes;
    }

    public String toString() {
        return "GatewayProperties{routes=" + this.routes + ", defaultFilters=" + this.defaultFilters + ", streamingMediaTypes=" + this.streamingMediaTypes + '}';
    }
}

以上會被默認加載而且讀取配置信息，以下配置信息：spring

  • spring.cloud.gateway.routes:網關路由定義配置，列表形式
  • spring.cloud.gateway.default-filters: 網關默認過濾器定義配置，列表形式
  • spring.cloud.gateway.streamingMediaTypes:網關網絡媒體類型，列表形式
其中routes是RouteDefinition集合，defaultFilters是FilterDefinition集合，參看具體的 配置字段。實際配置文件可以下： 
spring:
  cloud:
    gateway:
      default-filters:
      - PrefixPath=/httpbin
      - AddResponseHeader=X-Response-Default-Foo, Default-Bar
      routes:
      - id: websocket_test
        uri: ws://localhost:9000
        order: 9000
        predicates:
        - Path=/echo
      - id: default_path_to_httpbin
        uri: ${test.uri}
        order: 10000
        predicates:
        - Path=/**

注意：default-filters的配置PrefixPath=/httpbin字符串，能夠查看FilterDefinition的構造函數，它其中構造函數包含接收一個text字符串解析字符傳並建立實例信息。predicates的配置也是如此。express

字符傳格式：name=param1,param2,param3apache

    public FilterDefinition(String text) {
        int eqIdx = text.indexOf("=");
        if (eqIdx <= 0) {
            this.setName(text);
        } else {
            this.setName(text.substring(0, eqIdx));
            String[] args = StringUtils.tokenizeToStringArray(text.substring(eqIdx + 1), ",");

            for(int i = 0; i < args.length; ++i) {
                this.args.put(NameUtils.generateName(i), args[i]);
            }

        }
    }

2、Route初始化加載

2.一、GatewayAutoConfiguration加載RouteLocator

　　Spring-Cloud-Gateway路由信息是經過路由定位器RouteLocator加載以及初始化。
　　在Spring-Cloud-Gateway初始化時，同時GatewayAutoConfiguration核心配置類會被初始化加載以下 ： 
    /**
     * 建立一個根據RouteDefinition轉換的路由定位器
     */
    @Bean
    public RouteLocator routeDefinitionRouteLocator(GatewayProperties properties,
                                                   List<GatewayFilterFactory> GatewayFilters,
                                                   List<RoutePredicateFactory> predicates,
                                                   RouteDefinitionLocator routeDefinitionLocator) {
        return new RouteDefinitionRouteLocator(routeDefinitionLocator, predicates, GatewayFilters, properties);
    }

    /**
     * 建立一個緩存路由的路由定位器
     * @param routeLocators
     * @return
     */
    @Bean
    @Primary//在相同的bean中，優先使用用@Primary註解的bean.
    public RouteLocator cachedCompositeRouteLocator(List<RouteLocator> routeLocators) {
        
        //1.建立組合路由定位器，根據(容器)已有的路由定位器集合
        //2.建立緩存功能的路由定位器
        return new CachingRouteLocator(new CompositeRouteLocator(Flux.fromIterable(routeLocators)));
    }

路由定位器的建立流程：緩存

1、RouteDefinitionRouteLocator
2、CompositeRouteLocator
3、CachingRouteLocator
其中 RouteDefinitionRouteLocator 是獲取路由的主要地方，CompositeRouteLocator，CachingRouteLocator對路由定位器作了附加功能的包裝，最終使用的是CachingRouteLocator對外提供服務

2.二、查看RouteLocator源碼：

/**
 * 路由定位器，服務獲取路由信息
 * 能夠經過 RouteDefinitionRouteLocator 獲取 RouteDefinition ，並轉換成 Route
 */
public interface RouteLocator {

    /**
     * 獲取路由
     */
    Flux<Route> getRoutes();
}

查看RouteLocator實現類websocket

緩存功能實現→CachingRouteLocator
組合功能實現→CompositeRouteLocator
經過路由定義轉換路由實現→RouteDefinitionRouteLocator

2.三、緩存功能實現→CachingRouteLocator

// 路由定位器的包裝類，實現了路由的本地緩存功能
public class CachingRouteLocator implements RouteLocator {
    //目標路由定位器
    private final RouteLocator delegate;

    /**
     * 路由信息
     * Flux 至關於一個 RxJava Observable，
     * 可以發出 0~N 個數據項，而後（可選地）completing 或 erroring。處理多個數據項做爲stream
     */
    private final Flux<Route> routes;

    // 本地緩存，用於緩存路由定位器獲取的路由集合
    private final Map<String, List> cache = new HashMap<>();
    public CachingRouteLocator(RouteLocator delegate) {
        this.delegate = delegate;
        routes = CacheFlux.lookup(cache, "routes", Route.class)
                .onCacheMissResume(() -> this.delegate.getRoutes().sort(AnnotationAwareOrderComparator.INSTANCE));
    }
    @Override
    public Flux<Route> getRoutes() {
        return this.routes;
    }

    // 刷新緩存
    public Flux<Route> refresh() {
        this.cache.clear();
        return this.routes;
    }

    @EventListener(RefreshRoutesEvent.class)
    void handleRefresh() {
        refresh();
    }
}

一、路由信息的本地緩存，經過Map<String, List> cache 緩存路由到內存中；
二、此類經過@EventListener(RefreshRoutesEvent.class)監聽RefreshRoutesEvent事件實現了對緩存的動態刷新；網絡

注：路由動態刷新，使用GatewayControllerEndpoint發佈刷新事件

@RestControllerEndpoint(id = "gateway")
public class GatewayControllerEndpoint implements ApplicationEventPublisherAware{
    // 調用url= /gateway/refresh 刷新緩存中的路由信息
        @PostMapping("/refresh")
    public Mono<Void> refresh() {
        this.publisher.publishEvent(new RefreshRoutesEvent(this));
        return Mono.empty();
    }
}

2.四、組合功能實現→CompositeRouteLocator

//組合多個 RRouteLocator 的實現，爲Route提供統一獲取入口
public class CompositeRouteLocator implements RouteLocator {

    /**
     * 可以發出 0~N 個數據項(RouteLocator)，而後（可選地）completing 或 erroring。處理多個數據項做爲stream
     */
    private final Flux<RouteLocator> delegates;

    public CompositeRouteLocator(Flux<RouteLocator> delegates) {
        this.delegates = delegates;
    }

    @Override
    public Flux<Route> getRoutes() {
        //this.delegates.flatMap((routeLocator)-> routeLocator.getRoutes());
        return this.delegates.flatMap(RouteLocator::getRoutes);
    }
}

此類將遍歷傳入的目錄路由定位器集合，組合每一個路由定位器獲取到的路由信息

2.五、經過路由定義轉換路由實現→RouteDefinitionRouteLocator

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.springframework.cloud.gateway.route;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.stream.Collectors;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.event.FilterArgsEvent;
import org.springframework.cloud.gateway.event.PredicateArgsEvent;
import org.springframework.cloud.gateway.filter.FilterDefinition;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.OrderedGatewayFilter;
import org.springframework.cloud.gateway.filter.factory.GatewayFilterFactory;
import org.springframework.cloud.gateway.handler.AsyncPredicate;
import org.springframework.cloud.gateway.handler.predicate.PredicateDefinition;
import org.springframework.cloud.gateway.handler.predicate.RoutePredicateFactory;
import org.springframework.cloud.gateway.route.Route.AsyncBuilder;
import org.springframework.cloud.gateway.support.ConfigurationUtils;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.validation.Validator;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;

public class RouteDefinitionRouteLocator implements RouteLocator, BeanFactoryAware, ApplicationEventPublisherAware {
    protected final Log logger = LogFactory.getLog(this.getClass());
    private final RouteDefinitionLocator routeDefinitionLocator;
    private final Map<String, RoutePredicateFactory> predicates = new LinkedHashMap();
    private final Map<String, GatewayFilterFactory> gatewayFilterFactories = new HashMap();
    private final GatewayProperties gatewayProperties;
    private final SpelExpressionParser parser = new SpelExpressionParser();
    private BeanFactory beanFactory;
    private ApplicationEventPublisher publisher;
    @Autowired
    private Validator validator;

    public RouteDefinitionRouteLocator(RouteDefinitionLocator routeDefinitionLocator, List<RoutePredicateFactory> predicates, List<GatewayFilterFactory> gatewayFilterFactories, GatewayProperties gatewayProperties) {
        this.routeDefinitionLocator = routeDefinitionLocator;
        this.initFactories(predicates);
        gatewayFilterFactories.forEach((factory) -> {
            GatewayFilterFactory var10000 = (GatewayFilterFactory)this.gatewayFilterFactories.put(factory.name(), factory);
        });
        this.gatewayProperties = gatewayProperties;
    }

    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        this.beanFactory = beanFactory;
    }

    public void setApplicationEventPublisher(ApplicationEventPublisher publisher) {
        this.publisher = publisher;
    }

    private void initFactories(List<RoutePredicateFactory> predicates) {
        predicates.forEach((factory) -> {
            String key = factory.name();
            if (this.predicates.containsKey(key)) {
                this.logger.warn("A RoutePredicateFactory named " + key + " already exists, class: " + this.predicates.get(key) + ". It will be overwritten.");
            }

            this.predicates.put(key, factory);
            if (this.logger.isInfoEnabled()) {
                this.logger.info("Loaded RoutePredicateFactory [" + key + "]");
            }

        });
    }

    public Flux<Route> getRoutes() {
        return this.routeDefinitionLocator.getRouteDefinitions().map(this::convertToRoute).map((route) -> {
            if (this.logger.isDebugEnabled()) {
                this.logger.debug("RouteDefinition matched: " + route.getId());
            }

            return route;
        });
    }

    private Route convertToRoute(RouteDefinition routeDefinition) {
        AsyncPredicate<ServerWebExchange> predicate = this.combinePredicates(routeDefinition);
        List<GatewayFilter> gatewayFilters = this.getFilters(routeDefinition);
        return ((AsyncBuilder)Route.async(routeDefinition).asyncPredicate(predicate).replaceFilters(gatewayFilters)).build();
    }

    private List<GatewayFilter> loadGatewayFilters(String id, List<FilterDefinition> filterDefinitions) {
        List<GatewayFilter> filters = (List)filterDefinitions.stream().map((definition) -> {
            GatewayFilterFactory factory = (GatewayFilterFactory)this.gatewayFilterFactories.get(definition.getName());
            if (factory == null) {
                throw new IllegalArgumentException("Unable to find GatewayFilterFactory with name " + definition.getName());
            } else {
                Map<String, String> args = definition.getArgs();
                if (this.logger.isDebugEnabled()) {
                    this.logger.debug("RouteDefinition " + id + " applying filter " + args + " to " + definition.getName());
                }

                Map<String, Object> properties = factory.shortcutType().normalize(args, factory, this.parser, this.beanFactory);
                Object configuration = factory.newConfig();
                ConfigurationUtils.bind(configuration, properties, factory.shortcutFieldPrefix(), definition.getName(), this.validator);
                GatewayFilter gatewayFilter = factory.apply(configuration);
                if (this.publisher != null) {
                    this.publisher.publishEvent(new FilterArgsEvent(this, id, properties));
                }

                return gatewayFilter;
            }
        }).collect(Collectors.toList());
        ArrayList<GatewayFilter> ordered = new ArrayList(filters.size());

        for(int i = 0; i < filters.size(); ++i) {
            GatewayFilter gatewayFilter = (GatewayFilter)filters.get(i);
            if (gatewayFilter instanceof Ordered) {
                ordered.add(gatewayFilter);
            } else {
                ordered.add(new OrderedGatewayFilter(gatewayFilter, i + 1));
            }
        }

        return ordered;
    }

    private List<GatewayFilter> getFilters(RouteDefinition routeDefinition) {
        List<GatewayFilter> filters = new ArrayList();
        if (!this.gatewayProperties.getDefaultFilters().isEmpty()) {
            filters.addAll(this.loadGatewayFilters("defaultFilters", this.gatewayProperties.getDefaultFilters()));
        }

        if (!routeDefinition.getFilters().isEmpty()) {
            filters.addAll(this.loadGatewayFilters(routeDefinition.getId(), routeDefinition.getFilters()));
        }

        AnnotationAwareOrderComparator.sort(filters);
        return filters;
    }

    private AsyncPredicate<ServerWebExchange> combinePredicates(RouteDefinition routeDefinition) {
        List<PredicateDefinition> predicates = routeDefinition.getPredicates();
        AsyncPredicate<ServerWebExchange> predicate = this.lookup(routeDefinition, (PredicateDefinition)predicates.get(0));

        AsyncPredicate found;
        for(Iterator var4 = predicates.subList(1, predicates.size()).iterator(); var4.hasNext(); predicate = predicate.and(found)) {
            PredicateDefinition andPredicate = (PredicateDefinition)var4.next();
            found = this.lookup(routeDefinition, andPredicate);
        }

        return predicate;
    }

    private AsyncPredicate<ServerWebExchange> lookup(RouteDefinition route, PredicateDefinition predicate) {
        RoutePredicateFactory<Object> factory = (RoutePredicateFactory)this.predicates.get(predicate.getName());
        if (factory == null) {
            throw new IllegalArgumentException("Unable to find RoutePredicateFactory with name " + predicate.getName());
        } else {
            Map<String, String> args = predicate.getArgs();
            if (this.logger.isDebugEnabled()) {
                this.logger.debug("RouteDefinition " + route.getId() + " applying " + args + " to " + predicate.getName());
            }

            Map<String, Object> properties = factory.shortcutType().normalize(args, factory, this.parser, this.beanFactory);
            Object config = factory.newConfig();
            ConfigurationUtils.bind(config, properties, factory.shortcutFieldPrefix(), predicate.getName(), this.validator);
            if (this.publisher != null) {
                this.publisher.publishEvent(new PredicateArgsEvent(this, route.getId(), properties));
            }

            return factory.applyAsync(config);
        }
    }
}
View Code

此類的核心方法getRoutes經過傳入的routeDefinitionLocator獲取路由定位，並循環遍歷路由定位依次轉換成路由返回，
代碼中能夠看到getRoutes經過convertToRoute方法將路由定位轉換成路由的

2.5.一、RouteDefinition轉換:convertToRoute

    // RouteDefinition 轉換爲對應的Route
    private Route convertToRoute(RouteDefinition routeDefinition) {
        //獲取routeDefinition中的Predicate信息
        Predicate<ServerWebExchange> predicate = combinePredicates(routeDefinition);
        //獲取routeDefinition中的GatewayFilter信息
        List<GatewayFilter> gatewayFilters = getFilters(routeDefinition);
        //構建路由信息
        return Route.builder(routeDefinition)
                .predicate(predicate)
                .replaceFilters(gatewayFilters)
                .build();
    }

convertToRoute方法功能做用
　　獲取routeDefinition中的Predicate信息 （經過combinePredicates方法）
　　獲取routeDefinition中的GatewayFilter信息（經過gatewayFilters方法）
　　構建路由信息

一、convertToRoute中combinePredicates獲取routeDefinition中的Predicate信息以下：

    // 返回組合的謂詞
    private Predicate<ServerWebExchange> combinePredicates(RouteDefinition routeDefinition) {
        //獲取RouteDefinition中的PredicateDefinition集合
        List<PredicateDefinition> predicates = routeDefinition.getPredicates();

        Predicate<ServerWebExchange> predicate = lookup(routeDefinition, predicates.get(0));

        for (PredicateDefinition andPredicate : predicates.subList(1, predicates.size())) {
            Predicate<ServerWebExchange> found = lookup(routeDefinition, andPredicate);
             //流程4
            //返回一個組合的謂詞，表示該謂詞與另外一個謂詞的短路邏輯AND
            predicate = predicate.and(found);
        }

        return predicate;
    }

    /**
     * 獲取一個謂語定義（PredicateDefinition）轉換的謂語
     * @param route
     * @param predicate
     * @return
     */
    @SuppressWarnings("unchecked")
    private Predicate<ServerWebExchange> lookup(RouteDefinition route, PredicateDefinition predicate) {
        //流程1
        //流程1==獲取謂語建立工廠
        RoutePredicateFactory<Object> factory = this.predicates.get(predicate.getName());
        if (factory == null) {
            throw new IllegalArgumentException("Unable to find RoutePredicateFactory with name " + predicate.getName());
        }
        //流程2
        //獲取參數
        Map<String, String> args = predicate.getArgs();
        if (logger.isDebugEnabled()) {
            logger.debug("RouteDefinition " + route.getId() + " applying "
                    + args + " to " + predicate.getName());
        }

        //組裝參數
        Map<String, Object> properties = factory.shortcutType().normalize(args, factory, this.parser, this.beanFactory);
        //構建建立謂語的配置信息
        Object config = factory.newConfig();
        ConfigurationUtils.bind(config, properties,
                factory.shortcutFieldPrefix(), predicate.getName(), validator);
        if (this.publisher != null) {
            this.publisher.publishEvent(new PredicateArgsEvent(this, route.getId(), properties));
        }
        //流程3
        //經過謂語工廠構建謂語
        return factory.apply(config);
    }

獲取Predicate流程:

  • 根據PredicateDefinition name 獲取 RoutePredicateFactory
  • 根據PredicateDefinition args 組裝 config信息
  • 經過RoutePredicateFactory 根據config信息建立Predicate信息
  • 多個Predicate 以短路邏輯AND組合
二、convertToRoute中 getFilters獲取routeDefinition中的GatewayFilter信息 
private List<GatewayFilter> getFilters(RouteDefinition routeDefinition) {
        List<GatewayFilter> filters = new ArrayList<>();

        //校驗gatewayProperties是否含義默認的過濾器集合
        if (!this.gatewayProperties.getDefaultFilters().isEmpty()) {
            //加載全局配置的默認過濾器集合
            filters.addAll(loadGatewayFilters("defaultFilters",
                    this.gatewayProperties.getDefaultFilters()));
        }

        if (!routeDefinition.getFilters().isEmpty()) {
            //加載路由定義中的過濾器集合
            filters.addAll(loadGatewayFilters(routeDefinition.getId(), routeDefinition.getFilters()));
        }

        //排序
        AnnotationAwareOrderComparator.sort(filters);
        return filters;
    }
     /**
     * 加載過濾器，根據過濾器的定義加載
     * @param id
     * @param filterDefinitions
     * @return
     */
    @SuppressWarnings("unchecked")
    private List<GatewayFilter> loadGatewayFilters(String id, List<FilterDefinition> filterDefinitions) {
        //遍歷過濾器定義，將過濾器定義轉換成對應的過濾器
        List<GatewayFilter> filters = filterDefinitions.stream()
                .map(definition -> {
                
                   //流程1    //經過過濾器定義名稱獲取過濾器建立工廠
                    GatewayFilterFactory factory = this.gatewayFilterFactories.get(definition.getName());
                    if (factory == null) {
                        throw new IllegalArgumentException("Unable to find GatewayFilterFactory with name " + definition.getName());
                    }
                    //流程2
                    //獲取參數
                    Map<String, String> args = definition.getArgs();
                    if (logger.isDebugEnabled()) {
                        logger.debug("RouteDefinition " + id + " applying filter " + args + " to " + definition.getName());
                    }

                    //根據args組裝配置信息
                    Map<String, Object> properties = factory.shortcutType().normalize(args, factory, this.parser, this.beanFactory);
                    //構建過濾器建立配置信息
                    Object configuration = factory.newConfig();
                    ConfigurationUtils.bind(configuration, properties,
                            factory.shortcutFieldPrefix(), definition.getName(), validator);

//流程3
                    //經過過濾器工廠建立GatewayFilter
                    GatewayFilter gatewayFilter = factory.apply(configuration);
                    if (this.publisher != null) {
                        //發佈事件
                        this.publisher.publishEvent(new FilterArgsEvent(this, id, properties));
                    }
                    return gatewayFilter;
                })
                .collect(Collectors.toList());

        ArrayList<GatewayFilter> ordered = new ArrayList<>(filters.size());
        //包裝過濾器使其全部過濾器繼承Ordered屬性，可進行排序
        for (int i = 0; i < filters.size(); i++) {
            GatewayFilter gatewayFilter = filters.get(i);
            if (gatewayFilter instanceof Ordered) {
                ordered.add(gatewayFilter);
            }
            else {
                ordered.add(new OrderedGatewayFilter(gatewayFilter, i + 1));
            }
        }

        return ordered;
    }
  • getFilters 方法 同時加載 全局配置 gatewayProperties與routeDefinition配置下的全部過濾器定義filterDefinitions
  • loadGatewayFilters 負責將filterDefinition轉化成對應的GatewayFilter
    轉化流程以下
  1. 根據filterDefinition name 獲取 GatewayFilterFactory
  2. 根據filterDefinition args 組裝 config信息
  3. 經過GatewayFilterFactory 根據config信息建立PGatewayFilter信息
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