官方参考文档：

动态规则扩展 · alibaba/Sentinel Wiki · GitHub

需要修改的代码如下：

为了便于后续版本集成nacos，简单讲一下集成思路

1.更改pom

修改sentinel-datasource-nacos的范围

将

 <dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-datasource-nacos</artifactId><scope>test</scope>
</dependency>

改为

 <dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-datasource-nacos</artifactId><!--<scope>test</scope>-->
</dependency>

2.拷贝示例

将test目录下的com.alibaba.csp.sentinel.dashboard.rule.nacos包下的内容拷贝到src的 com.alibaba.csp.sentinel.dashboard.rule的目录

test目录只包含限流，其他规则参照创建即可。

创建时注意修改常量，并且在NacosConfig实现各种converter

注意：授权规则和热点规则需要特殊处理，否则nacos配置不生效。

因为授权规则Entity比流控规则Entity多包了一层。

public class FlowRuleEntity implements RuleEntity 
public class AuthorityRuleEntity extends AbstractRuleEntity<AuthorityRule>

以授权规则为例

AuthorityRuleNacosProvider.java

/** Copyright 1999-2018 Alibaba Group Holding Ltd.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** 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.alibaba.csp.sentinel.dashboard.rule.nacos.authority;import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.AuthorityRuleEntity;
import com.alibaba.csp.sentinel.dashboard.rule.DynamicRuleProvider;
import com.alibaba.csp.sentinel.dashboard.rule.nacos.NacosConfigUtil;
import com.alibaba.csp.sentinel.datasource.Converter;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRule;
import com.alibaba.csp.sentinel.util.StringUtil;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.nacos.api.config.ConfigService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;import java.util.ArrayList;
import java.util.List;/*** @author Eric Zhao* @since 1.4.0*/
@Component("authorityRuleNacosProvider")
public class AuthorityRuleNacosProvider implements DynamicRuleProvider<List<AuthorityRuleEntity>> {@Autowiredprivate ConfigService configService;@Autowiredprivate Converter<String, List<AuthorityRuleEntity>> converter;@Overridepublic List<AuthorityRuleEntity> getRules(String appName) throws Exception {String rules = configService.getConfig(appName + NacosConfigUtil.AUTHORITY_DATA_ID_POSTFIX,NacosConfigUtil.GROUP_ID, 3000);if (StringUtil.isEmpty(rules)) {return new ArrayList<>();}return converter.convert(this.parseRules(rules));}private String parseRules(String rules) {JSONArray newRuleJsons = new JSONArray();JSONArray ruleJsons = JSONArray.parseArray(rules);for (int i = 0; i < ruleJsons.size(); i++) {JSONObject ruleJson = ruleJsons.getJSONObject(i);AuthorityRuleEntity ruleEntity = JSON.parseObject(ruleJson.toJSONString(), AuthorityRuleEntity.class);JSONObject newRuleJson = JSON.parseObject(JSON.toJSONString(ruleEntity));AuthorityRule rule = JSON.parseObject(ruleJson.toJSONString(), AuthorityRule.class);newRuleJson.put("rule", rule);newRuleJsons.add(newRuleJson);}return newRuleJsons.toJSONString();}
}

AuthorityRuleNacosPublisher.java

/** Copyright 1999-2018 Alibaba Group Holding Ltd.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** 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.alibaba.csp.sentinel.dashboard.rule.nacos.authority;import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.AuthorityRuleEntity;
import com.alibaba.csp.sentinel.dashboard.rule.DynamicRulePublisher;
import com.alibaba.csp.sentinel.dashboard.rule.nacos.NacosConfigUtil;
import com.alibaba.csp.sentinel.datasource.Converter;
import com.alibaba.csp.sentinel.util.AssertUtil;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.nacos.api.config.ConfigService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;import java.util.List;/*** @author Eric Zhao* @since 1.4.0*/
@Component("authorityRuleNacosPublisher")
public class AuthorityRuleNacosPublisher implements DynamicRulePublisher<List<AuthorityRuleEntity>> {@Autowiredprivate ConfigService configService;@Autowiredprivate Converter<List<AuthorityRuleEntity>, String> converter;@Overridepublic void publish(String app, List<AuthorityRuleEntity> rules) throws Exception {AssertUtil.notEmpty(app, "app name cannot be empty");if (rules == null) {return;}configService.publishConfig(app + NacosConfigUtil.AUTHORITY_DATA_ID_POSTFIX,NacosConfigUtil.GROUP_ID,  this.parseRules(converter.convert(rules)));}private String parseRules(String rules) {JSONArray oldRuleJsons = JSONArray.parseArray(rules);for (int i = 0; i < oldRuleJsons.size(); i++) {JSONObject oldRuleJson = oldRuleJsons.getJSONObject(i);JSONObject ruleJson = oldRuleJson.getJSONObject("rule");oldRuleJson.putAll(ruleJson);oldRuleJson.remove("rule");}return oldRuleJsons.toJSONString();}
}

热点规则同理

3.修改controller

v2目录的FlowControllerV2

将

 @Autowired@Qualifier("flowRuleDefaultProvider")private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;@Autowired@Qualifier("flowRuleDefaultPublisher")private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;

改为

 @Autowired@Qualifier("flowRuleNacosProvider")private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;@Autowired@Qualifier("flowRuleNacosPublisher")private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;

controller目录的其他controller包括

AuthorityRuleController DegradeController FlowControllerV1 ParamFlowRuleController SystemController

做如下更改(以DegradeController为例)

将

@Autowiredprivate SentinelApiClient sentinelApiClient;

改成

@Autowired@Qualifier("degradeRuleNacosProvider")private DynamicRuleProvider<List<DegradeRuleEntity>> ruleProvider;@Autowired@Qualifier("degradeRuleNacosPublisher")private DynamicRulePublisher<List<DegradeRuleEntity>> rulePublisher;

将原有publishRules方法删除，统一改成

 private void publishRules(/*@NonNull*/ String app) throws Exception {List<DegradeRuleEntity> rules = repository.findAllByApp(app);rulePublisher.publish(app, rules);}

之后解决报错的地方即可。

获取所有rules的地方

将

 List<DegradeRuleEntity> rules = sentinelApiClient.fetchDegradeRuleOfMachine(app, ip, port);

改成

List<DegradeRuleEntity> rules = ruleProvider.getRules(app);

原有调用publishRules方法的地方，删除掉

在上一个try catch方法里加上

publishRules(entity.getApp());

这里的entity.getApp()也有可能是oldEntity.getApp()/app等变量。根据删除的publishRules代码片段推测即可。

4.修改前端文件

文件路径:src/main/webapp/resources/app/scripts/directives/sidebar/sidebar.html

将

 <a ui-sref="dashboard.flowV1({app: entry.app})">

改成

 <a ui-sref="dashboard.flow({app: entry.app})">

5.最后打包即可

执行命令打包成jar

mvn clean package

运行方法与官方jar一致，不做赘述

6.微服务程序集成

pom.xml添加

        <dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-datasource-nacos</artifactId></dependency>

配置文件application.yml添加

spring:cloud:sentinel:datasource:# 名称随意flow:nacos:server-addr: localhost:8848dataId: ${spring.application.name}-flow-rulesgroupId: SENTINEL_GROUP# 规则类型，取值见：# org.springframework.cloud.alibaba.sentinel.datasource.RuleTyperule-type: flowdegrade:nacos:server-addr: localhost:8848dataId: ${spring.application.name}-degrade-rulesgroupId: SENTINEL_GROUPrule-type: degradesystem:nacos:server-addr: localhost:8848dataId: ${spring.application.name}-system-rulesgroupId: SENTINEL_GROUPrule-type: systemauthority:nacos:server-addr: localhost:8848dataId: ${spring.application.name}-authority-rulesgroupId: SENTINEL_GROUPrule-type: authorityparam-flow:nacos:server-addr: localhost:8848dataId: ${spring.application.name}-param-flow-rulesgroupId: SENTINEL_GROUPrule-type: param-flow

7.测试验证

在sentinel控制台界面添加几个流控规则后尝试关闭微服务和sentinel，然后重新打开sentinel和微服务，看流控规则是否还在。

8.最后把配置好的代码发给大家，大家可以自行下载，里边有运行访问流程

https://download.csdn.net/download/qq_34091529/88482757