Sentinel规则持久化方式
文章目录
-
- FilePersistence配置类
- 添加配置
- 推荐文章
-
- 觉得对您有帮助就留下个宝贵的吧！
我们可以通过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，就是这些规则默认是存放在内存中，极不稳定，所以需要将其持久化。本地文件数据源会定时轮询文件的变更，读取规则。这样我们既可以在应用本地直接修改文件来更新规则，也可以通过 Sentinel 控制台推送规则。以本地文件数据源为例，推送过程如下图所示：
首先 Sentinel 控制台通过 API 将规则推送至客户端并更新到内存中，接着注册的写数据源会将新的规则保存到本地的文件中。
FilePersistence配置类
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 FilePersistence implements InitFunc {
@Value("spring.application:name")
private String appcationName;
@Override
public void init() throws Exception {
//指定文件生成目录
String ruleDir = System.getProperty("user.home") + "/sentinelrules/" + appcationName;
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);
}
}
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，刚才添加的配置类
com.xxx.config.FilePersistence
然后在sentinel客户端添加限流、降级等配置重新启动服务，之前保留的配置还在
这个目录就是我们在项目中指定的生成目录做的持久化文件
-
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