- 前言
- 环境说明和准备
- 如何持久化规则到文件
通过Dashboard来为每个Sentinel客户端设置各种各样的规则，但是这里有一个问题，就是这些规则默认时存在内存中的，极不稳定，所以需要将其持久化。本章讲解如何持久化到磁盘。
本章代码已分享至Gitee: https://gitee.com/lengcz/springcloudalibaba01.git
环境说明和准备springboot版本：2.3.2.RELEASE
spring-cloud版本：Hoxton.SR8
spring-cloud-alibaba版本：2.2.5.RELEASE
sentinel-dashboard版本： 1.8.4
- 添加持久化代码
package com.lcz.config;
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 com.lcz.util.SpringBeanUtils;
import java.io.File;
import java.io.IOException;
import java.util.List;
public class FilePersistence implements InitFunc{
@Override
public void init() throws Exception {
String applicationName=SpringBeanUtils.getApplicationContext().getEnvironment().getProperty("spring.application.name");
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> flowRuleRDS = new FileRefreshableDataSource<>(
flowRulePath,
flowRuleListParser
);
FlowRuleManager.register2Property(flowRuleRDS.getProperty());
WritableDataSource> flowRuleWDS = new FileWritableDataSource<>(
flowRulePath,
this::encodeJson
);
WritableDataSourceRegistry.registerFlowDataSource(flowRuleWDS);
// 降级规则
ReadableDataSource> degradeRuleRDS = new FileRefreshableDataSource<>(
degradeRulePath,
degradeRuleListParser
);
DegradeRuleManager.register2Property(degradeRuleRDS.getProperty());
WritableDataSource> degradeRuleWDS = new FileWritableDataSource<>(
degradeRulePath,
this::encodeJson
);
WritableDataSourceRegistry.registerDegradeDataSource(degradeRuleWDS);
// 系统规则
ReadableDataSource> systemRuleRDS = new FileRefreshableDataSource<>(
systemRulePath,
systemRuleListParser
);
SystemRuleManager.register2Property(systemRuleRDS.getProperty());
WritableDataSource> systemRuleWDS = new FileWritableDataSource<>(
systemRulePath,
this::encodeJson
);
WritableDataSourceRegistry.registerSystemDataSource(systemRuleWDS);
// 授权规则
ReadableDataSource> authorityRuleRDS = new FileRefreshableDataSource<>(
authorityRulePath,
authorityRuleListParser
);
AuthorityRuleManager.register2Property(authorityRuleRDS.getProperty());
WritableDataSource> authorityRuleWDS = new FileWritableDataSource<>(
authorityRulePath,
this::encodeJson
);
WritableDataSourceRegistry.registerAuthorityDataSource(authorityRuleWDS);
// 热点参数规则
ReadableDataSource> paramFlowRuleRDS = new FileRefreshableDataSource<>(
paramFlowRulePath,
paramFlowRuleListParser
);
ParamFlowRuleManager.register2Property(paramFlowRuleRDS.getProperty());
WritableDataSource> paramFlowRuleWDS = new FileWritableDataSource<>(
paramFlowRulePath,
this::encodeJson
);
ModifyParamFlowRulesCommandHandler.setWritableDataSource(paramFlowRuleWDS);
}
private Converter> flowRuleListParser = source -> JSON.parseObject(
source,
new TypeReference>() {
}
);
private Converter> degradeRuleListParser = source -> JSON.parseObject(
source,
new TypeReference>() {
}
);
private Converter> systemRuleListParser = source -> JSON.parseObject(
source,
new TypeReference>() {
}
);
private Converter> authorityRuleListParser = source -> JSON.parseObject(
source,
new TypeReference>() {
}
);
private Converter> paramFlowRuleListParser = source -> JSON.parseObject(
source,
new TypeReference>() {
}
);
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 String encodeJson(T t) {
return JSON.toJSONString(t);
}
}
- 添加SpringBeanUtils
package com.lcz.util;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.stereotype.Component;
@Component
public class SpringBeanUtils implements ApplicationContextAware {
private static ConfigurableApplicationContext context;
public void setApplicationContext(ApplicationContext applicationContext) {
context = (ConfigurableApplicationContext) applicationContext;
}
public static ConfigurableApplicationContext getApplicationContext() {
return context;
}
}
- 在resources下新建目录META-INF/services ，并创建文件，名称为
com.alibaba.csp.sentinel.init.InitFunc
文件的内容为
com.lcz.config.FilePersistence
-
启动服务器，访问微服务的链接后，并添加规则
-
查看持久化的规则文件
