Merge pull request #32 from pengkai242/main

gateway增加动态路由的能力，根据用户url自动匹配到注册的服务

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/java/com/tencent/cloud/polaris/gateway/config/PolarisGatewayAutoConfiguration.java

@@ -19,6 +19,8 @@ package com.tencent.cloud.polaris.gateway.config;
 
 import com.netflix.zuul.ZuulFilter;
 import com.netflix.zuul.http.ZuulServlet;
+import com.tencent.cloud.polaris.gateway.core.route.DynamicRouteService;
+import com.tencent.cloud.polaris.gateway.core.scg.filter.DynamicRouteScgFilter;
 import com.tencent.cloud.polaris.gateway.core.scg.filter.Metadata2HeaderScgFilter;
 import com.tencent.cloud.polaris.gateway.core.scg.filter.MetadataFirstScgFilter;
 import com.tencent.cloud.polaris.gateway.core.scg.filter.RateLimitScgFilter;
@@ -73,6 +75,16 @@ public class PolarisGatewayAutoConfiguration {
         public GlobalFilter metadata2HeaderScgFilter() {
             return new Metadata2HeaderScgFilter();
         }
+
+        @Bean
+        public DynamicRouteService dynamicRouteService() {
+            return new DynamicRouteService();
+        }
+
+        @Bean
+        public DynamicRouteScgFilter dynamicRouteFilter() {
+            return new DynamicRouteScgFilter();
+        }
     }
 
 }

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/java/com/tencent/cloud/polaris/gateway/core/route/DynamicRouteService.java

@@ -0,0 +1,103 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.core.route;
+
+import javax.annotation.Resource;
+import org.springframework.cloud.gateway.event.RefreshRoutesEvent;
+import org.springframework.cloud.gateway.route.RouteDefinition;
+import org.springframework.cloud.gateway.route.RouteDefinitionWriter;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.context.ApplicationEventPublisherAware;
+import reactor.core.publisher.Mono;
+
+
+/**
+ * dynamic route service.
+ *
+ * @author bruceppeng
+ */
+public class DynamicRouteService implements ApplicationEventPublisherAware {
+
+    @Resource
+    private RouteDefinitionWriter routeDefinitionWriter;
+
+    private ApplicationEventPublisher publisher;
+
+    private void notifyChanged() {
+        this.publisher.publishEvent(new RefreshRoutesEvent(this));
+    }
+
+
+    /**
+     * add route.
+     * @param definition definition
+     * @return sucess
+     */
+    public String add(RouteDefinition definition) {
+        routeDefinitionWriter.save(Mono.just(definition)).subscribe();
+        notifyChanged();
+        return "success";
+    }
+
+
+    /**
+     * update route.
+     * @param definition definition
+     * @return sucess
+     */
+    public String update(RouteDefinition definition) {
+        try {
+            this.routeDefinitionWriter.delete(Mono.just(definition.getId()));
+        } catch (Exception e) {
+            return "update fail,not find route  routeId: " + definition.getId();
+        }
+        try {
+            routeDefinitionWriter.save(Mono.just(definition)).subscribe();
+            notifyChanged();
+            return "success";
+        } catch (Exception e) {
+            return "update route  fail";
+        }
+
+
+    }
+
+    /**
+     * delete route.
+     * @param id id
+     * @return sucess
+     */
+    public String delete(String id) {
+        try {
+            this.routeDefinitionWriter.delete(Mono.just(id)).subscribe();
+
+            notifyChanged();
+            return "delete success";
+        } catch (Exception e) {
+            e.printStackTrace();
+            return "delete fail";
+        }
+
+    }
+
+    @Override
+    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
+        this.publisher = applicationEventPublisher;
+    }
+
+}

spring-cloud-tencent-starters/spring-cloud-tencent-polaris-gateway/src/main/java/com/tencent/cloud/polaris/gateway/core/scg/filter/DynamicRouteScgFilter.java

@@ -0,0 +1,103 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.cloud.polaris.gateway.core.scg.filter;
+
+import com.tencent.cloud.metadata.constant.MetadataConstant;
+import com.tencent.cloud.metadata.context.MetadataContextHolder;
+import com.tencent.cloud.polaris.gateway.core.route.DynamicRouteService;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cloud.gateway.config.GatewayProperties;
+import org.springframework.cloud.gateway.filter.FilterDefinition;
+import org.springframework.cloud.gateway.handler.predicate.PredicateDefinition;
+import org.springframework.cloud.gateway.route.RouteDefinition;
+import org.springframework.core.Ordered;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.WebFilter;
+import org.springframework.web.server.WebFilterChain;
+import reactor.core.publisher.Mono;
+
+/**
+ * Filter for implement dynamic route.
+ *
+ * @author kan peng
+ */
+public class DynamicRouteScgFilter implements WebFilter, Ordered {
+
+    private static final Logger LOG = LoggerFactory.getLogger(DynamicRouteScgFilter.class);
+
+    @Autowired
+    private DynamicRouteService dynamicRouteService;
+
+    @Autowired
+    private GatewayProperties gatewayProperties;
+
+    @Override
+    public int getOrder() {
+        return MetadataConstant.OrderConstant.FILTER_ORDER + 1;
+    }
+
+    @Override
+    public Mono<Void> filter(ServerWebExchange serverWebExchange, WebFilterChain webFilterChain) {
+
+
+        ServerHttpRequest serverHttpRequest = serverWebExchange.getRequest();
+        String requestPath = serverHttpRequest.getURI().getPath();
+        String[] pathList = requestPath.split("/");
+        String id = pathList[1];
+        String path = String.format("/%s/**",id);
+
+        //Check whether the route has been loaded
+        for(RouteDefinition routeDefinition: gatewayProperties.getRoutes()){
+            if (id.equals(routeDefinition.getId())){
+                return webFilterChain.filter(serverWebExchange);
+            }
+        }
+
+        RouteDefinition definition = new RouteDefinition();
+        definition.setId(id);
+        URI uri = URI.create("lb://"+id);
+        definition.setUri(uri);
+
+        //Define the first assertion
+        PredicateDefinition predicate = new PredicateDefinition();
+        predicate.setName("Path");
+
+        Map<String, String> predicateParams = new HashMap<>(8);
+        predicateParams.put("pattern", path);
+        predicate.setArgs(predicateParams);
+
+        //Define Filter
+        FilterDefinition filter = new FilterDefinition();
+        filter.setName("StripPrefix");
+        filter.addArg("parts","1");
+
+        definition.setFilters(Arrays.asList(filter));
+        definition.setPredicates(Arrays.asList(predicate));
+        dynamicRouteService.add(definition);
+
+        return webFilterChain.filter(serverWebExchange);
+    }
+
+}