sentinel控制台结合网关gateway项目实现pull模式持久化规则

环境：
自己搭建的一个微服务项目；
一个网关项目；
sentinel项目，从官网下载的源码；
网关和sentinel完成关联；

1.在网关项目里新建一个类，如下：

package com.alibaba.csp.sentinel.dashboard.rule.file;

import java.io.File;
import java.io.IOException;
import java.util.List;

import com.alibaba.csp.sentinel.command.handler.ModifyParamFlowRulesCommandHandler;
import com.alibaba.csp.sentinel.datasource.Converter;
import com.alibaba.csp.sentinel.datasource.FileRefreshableDataSource;
import com.alibaba.csp.sentinel.datasource.FileWritableDataSource;
import com.alibaba.csp.sentinel.datasource.ReadableDataSource;
import com.alibaba.csp.sentinel.datasource.WritableDataSource;
import com.alibaba.csp.sentinel.init.InitFunc;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRule;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRuleManager;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRule;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRuleManager;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowRuleManager;
import com.alibaba.csp.sentinel.slots.system.SystemRule;
import com.alibaba.csp.sentinel.slots.system.SystemRuleManager;
import com.alibaba.csp.sentinel.transport.util.WritableDataSourceRegistry;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;

/**	
 * 拉模式规则持久化	
 *	
 * @author itmuch.com	
 */	
public class FileDataSourceInit implements InitFunc {	
    @Override	
    public void init() throws Exception {	
        // TIPS: 如果你对这个路径不喜欢，可修改为你喜欢的路径	
        String ruleDir = System.getProperty("user.home") + "/sentinel/rules";	
        String flowRulePath = ruleDir + "/flow-rule.json";	
        String degradeRulePath = ruleDir + "/degrade-rule.json";	
        String systemRulePath = ruleDir + "/system-rule.json";	
        String authorityRulePath = ruleDir + "/authority-rule.json";	
        String paramFlowRulePath = ruleDir + "/param-flow-rule.json";	
	
        this.mkdirIfNotExits(ruleDir);	
        this.createFileIfNotExits(flowRulePath);	
        this.createFileIfNotExits(degradeRulePath);	
        this.createFileIfNotExits(systemRulePath);	
        this.createFileIfNotExits(authorityRulePath);	
        this.createFileIfNotExits(paramFlowRulePath);	
	
        // 流控规则	
        ReadableDataSource<String, List<FlowRule>> flowRuleRDS = new FileRefreshableDataSource<>(	
            flowRulePath,	
            flowRuleListParser	
        );	
        // 将可读数据源注册至FlowRuleManager	
        // 这样当规则文件发生变化时，就会更新规则到内存	
        FlowRuleManager.register2Property(flowRuleRDS.getProperty());	
        WritableDataSource<List<FlowRule>> flowRuleWDS = new FileWritableDataSource<>(	
            flowRulePath,	
            this::encodeJson	
        );	
        // 将可写数据源注册至transport模块的WritableDataSourceRegistry中	
        // 这样收到控制台推送的规则时，Sentinel会先更新到内存，然后将规则写入到文件中	
        WritableDataSourceRegistry.registerFlowDataSource(flowRuleWDS);	
	
        // 降级规则	
        ReadableDataSource<String, List<DegradeRule>> degradeRuleRDS = new FileRefreshableDataSource<>(	
            degradeRulePath,	
            degradeRuleListParser	
        );	
        DegradeRuleManager.register2Property(degradeRuleRDS.getProperty());	
        WritableDataSource<List<DegradeRule>> degradeRuleWDS = new FileWritableDataSource<>(	
            degradeRulePath,	
            this::encodeJson	
        );	
        WritableDataSourceRegistry.registerDegradeDataSource(degradeRuleWDS);	
	
        // 系统规则	
        ReadableDataSource<String, List<SystemRule>> systemRuleRDS = new FileRefreshableDataSource<>(	
            systemRulePath,	
            systemRuleListParser	
        );	
        SystemRuleManager.register2Property(systemRuleRDS.getProperty());	
        WritableDataSource<List<SystemRule>> systemRuleWDS = new FileWritableDataSource<>(	
            systemRulePath,	
            this::encodeJson	
        );	
        WritableDataSourceRegistry.registerSystemDataSource(systemRuleWDS);	
	
        // 授权规则	
        ReadableDataSource<String, List<AuthorityRule>> authorityRuleRDS = new FileRefreshableDataSource<>(	
            flowRulePath,	
            authorityRuleListParser	
        );	
        AuthorityRuleManager.register2Property(authorityRuleRDS.getProperty());	
        WritableDataSource<List<AuthorityRule>> authorityRuleWDS = new FileWritableDataSource<>(	
            authorityRulePath,	
            this::encodeJson	
        );	
        WritableDataSourceRegistry.registerAuthorityDataSource(authorityRuleWDS);	
	
        // 热点参数规则	
        ReadableDataSource<String, List<ParamFlowRule>> paramFlowRuleRDS = new FileRefreshableDataSource<>(	
            paramFlowRulePath,	
            paramFlowRuleListParser	
        );	
        ParamFlowRuleManager.register2Property(paramFlowRuleRDS.getProperty());	
        WritableDataSource<List<ParamFlowRule>> paramFlowRuleWDS = new FileWritableDataSource<>(	
            paramFlowRulePath,	
            this::encodeJson	
        );	
        ModifyParamFlowRulesCommandHandler.setWritableDataSource(paramFlowRuleWDS);	
    }	
	
    private Converter<String, List<FlowRule>> flowRuleListParser = source -> JSON.parseObject(	
        source,	
        new TypeReference<List<FlowRule>>() {	
        }	
    );	
    private Converter<String, List<DegradeRule>> degradeRuleListParser = source -> JSON.parseObject(	
        source,	
        new TypeReference<List<DegradeRule>>() {	
        }	
    );	
    private Converter<String, List<SystemRule>> systemRuleListParser = source -> JSON.parseObject(	
        source,	
        new TypeReference<List<SystemRule>>() {	
        }	
    );	
	
    private Converter<String, List<AuthorityRule>> authorityRuleListParser = source -> JSON.parseObject(	
        source,	
        new TypeReference<List<AuthorityRule>>() {	
        }	
    );	
	
    private Converter<String, List<ParamFlowRule>> paramFlowRuleListParser = source -> JSON.parseObject(	
        source,	
        new TypeReference<List<ParamFlowRule>>() {	
        }	
    );	
	
    private void mkdirIfNotExits(String filePath) throws IOException {	
        File file = new File(filePath);	
        if (!file.exists()) {	
            file.mkdirs();	
        }	
    }	
	
    private void createFileIfNotExits(String filePath) throws IOException {	
        File file = new File(filePath);	
        if (!file.exists()) {	
            file.createNewFile();	
        }	
    }	
	
    private <T> String encodeJson(T t) {	
        return JSON.toJSONString(t);	
    }	
}

以上代码转载自：https://blog.youkuaiyun.com/huangjinjin520/article/details/107572592

2.网关项目中新建一个文件，文件名：com.alibaba.csp.sentinel.init.InitFunc ，内容是上面那个类的全路径加类名，路径和文件内容如下图：

3.注意检查网关里的sentinel地址有没有配置好

spring.cloud.sentinel.transport.dashboard=localhost:8089

4.启动布好的三个项目，访问一个接口，然后在sentinel里加上流控规则，然后发现已经持久化到本地文件里了