sentinel持久化说明

Sentinel官网

部署配置有问题最好在钉钉群咨询 都有大佬解答

参考文章
https://github.com/alibaba/Sentinel/wiki在生产环境中使用-Sentinel#规则管理及推送
https://github.com/alibaba/Sentinel/wiki/动态规则扩展

一.原始模式（内存）

说明：扩展写数据源（WritableDataSource），API 将规则推送至客户端并直接更新到内存中
优点：简单，无任何依赖
缺点：不保证一致性；规则保存在内存中，重启即消失。严重不建议用于生产环境

二.Pull模式（本地实例化）

说明：扩展写数据源（WritableDataSource）， 客户端主动向某个规则管理中心定期轮询拉取规则，这个规则中心可以是 RDBMS、文件 等
优点：简单，无任何依赖；规则持久化
缺点：不保证一致性；实时性不保证，拉取过于频繁也可能会有性能问题。

1.将对应的读数据源注册至对应的 RuleManager，将写数据源注册至 transport 的 WritableDataSourceRegistry

import com.alibaba.csp.sentinel.command.handler.ModifyParamFlowRulesCommandHandler;
import com.alibaba.csp.sentinel.datasource.*;
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;
import org.springframework.beans.factory.annotation.Value;

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

public class FileDataSourceInit implements InitFunc {

    @Value("${spring.application.name}")
    private String applicationName;

    @Override
    public void init() throws Exception {
        String ruleDir = System.getProperty("user.home") + "/sentinel-rules/" + applicationName;
        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
        );
        FlowRuleManager.register2Property(flowRuleRDS.getProperty());
        WritableDataSource<List<FlowRule>> flowRuleWDS = new FileWritableDataSource<>(
                flowRulePath,
                this::encodeJson
        );
        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<>(
                authorityRulePath,
                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);
    }

}

2.添加配置

在resources下创建配置目录META-INF/services,然后添加文件com.alibaba.csp.sentinel.init.InitFunc
在文件中添加配置类的全路径

com.spiritmark.config.FileDataSourceInit

三.Push模式（第三方实例化）

1.7.2提供6种方式

说明：扩展读数据源（ReadableDataSource），规则中心统一推送，客户端通过注册监听器的方式时刻监听变化，比如使用 Nacos、Zookeeper 等配置中心。这种方式有更好的实时性和一致性保证。生产环境下一般采用 push 模式的数据源。
优点：规则持久化；一致性；快速
缺点：引入第三方依赖

以nacos为例说明

1.pom.xml添加配置

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

2.添加nacos数据源

spring:
  application:
    name: sentinel-nacos-service
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.33.88:8848
    sentinel:
      transport:
        port: 18003
        dashboard: 192.168.33.88:8080
      datasource:
        flow:
          nacos:
            serverAddr: 192.168.33.88:8848
            dataId: ${spring.application.name}-flow-rules
            groupId: DEFAULT_GROUP
            data-type: json
            rule-type: flow
        degrade:
          nacos:
            serverAddr: 192.168.33.88:8848
            dataId: ${spring.application.name}-degrade-rules
            groupId: DEFAULT_GROUP
            data-type: json
            rule-type: degrade

data-type：默认是json

rule-type：根据实际情况配置

3.添加Nacos业务规则配置

[
{
"resource": "rt",
"grade": "0",
"count": "1",
"limitApp": "default",
"timeWindow": "10"
},
{
"resource": "rt1",
"grade": "0",
"count": "6",
"limitApp": "default",
"timeWindow": "10"
}
]

内容解析
"resource": 资源名称
"limitApp":来源应用
"grade":阈值类型 0：RT 1：异常比例 2：异常数
"count":阈值
"timeWindow":时间窗口

四.代码

github