改造 Sentinel Dashboard 将规则持久化到Nacos

官网的改造教程 有案例代码可以直接使用 Push模式 开始看

原因：为什么改造
如果不做任何修改，Dashboard 的推送规则方式是通过 API 将规则推送至客户端并直接更新到内存中：
这种做法的好处是简单，无依赖；坏处是应用重启规则就会消失，仅用于简单测试，不能用于生产环境。

按照官网的说明改完之后还有有一个需要改在一下

/*
 * 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;

import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.FlowRuleEntity;
import com.alibaba.csp.sentinel.datasource.Converter;
import com.alibaba.fastjson.JSON;
import com.alibaba.nacos.api.config.ConfigFactory;
import com.alibaba.nacos.api.config.ConfigService;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.List;

/**
 * @author Eric Zhao
 * @since 1.4.0
 */
@Configuration
public class NacosConfig {
    @Value("${sentinel.dashboard.nacos.server-addr:localhost}")
    private String serverAddr;//这个是新增加的属性

    @Bean
    public Converter<List<FlowRuleEntity>, String> flowRuleEntityEncoder() {
        return JSON::toJSONString;
    }

    @Bean
    public Converter<String, List<FlowRuleEntity>> flowRuleEntityDecoder() {
        return s -> JSON.parseArray(s, FlowRuleEntity.class);
    }

    @Bean
    public ConfigService nacosConfigService() throws Exception {
        return ConfigFactory.createConfigService(serverAddr);//用自定义的nacos sever的路径
    }
}

改造完之后的资源下载