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springcloud Alibaba入门之sentinel使用Nacos进行持久化

墨春 2021-09-25 阅读 88
SpringCloudAlibaba系列springboot我的微服务设计方案技术专题-中间件微服务收藏-开发篇
  • 一是修改sentinel Dashboard的规则然后进行同步到nacos中
  • 二是在nacos管理台对我们限流的规则进行自定义的过程
  • a.首先我们来修改pom.xml中的sentinel-datasource-nacos的依赖,将<scope>test</scope>注释掉,这样做的目的是为了在我们的主程序中起到作用,代码如下:
 <!-- for Nacos rule publisher sample -->
    <dependency>
        <groupId>com.alibaba.csp</groupId>
        <artifactId>sentinel-datasource-nacos</artifactId>
        <scope>test</scope>
    </dependency>
  • b.接着我们需要修改resources/app/scripts/directives/sidebar/sidebar.html页面中的一段代码如:
 <li ui-sref-active="active" ng-if="!entry.isGateway">
        <a ui-sref="dashboard.flowV1({app: entry.app})">
          <i class="glyphicon glyphicon-filter"></i>&nbsp;&nbsp;流控规则</a>
      </li>

<li ui-sref-active="active">
        <a ui-sref="dashboard.flow({app: entry.app})">
          <i class="glyphicon glyphicon-filter"></i>&nbsp;&nbsp;流控规则
        </a>
 </li>
  • c.在com.alibaba.csp.sentinel.dashboard.rule包下新建一个nacos包,该包下主要存放我们对nacos的拓展规则以及配置的书写.
  • d.在nacos包下创建Nacos的配置类,代码如下:
''''
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.PropertyKeyConst;
import com.alibaba.nacos.api.config.ConfigFactory;
import com.alibaba.nacos.api.config.ConfigService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.List;
import java.util.Properties;

/**
 * @author cb
 */
@Configuration
public class NacosConfig {

@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 {
    Properties properties = new Properties();
    properties.put(PropertyKeyConst.SERVER_ADDR, "localhost");
    return ConfigFactory.createConfigService(properties);
    }
}
  • e.我们需要对nacos的配置进行远程拉取,代码如下:
package com.alibaba.csp.sentinel.dashboard.rule.nacos;

import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.FlowRuleEntity;
import com.alibaba.csp.sentinel.dashboard.rule.DynamicRuleProvider;
import com.alibaba.csp.sentinel.datasource.Converter;
import com.alibaba.csp.sentinel.util.StringUtil;
import com.alibaba.nacos.api.config.ConfigService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.ArrayList;
import java.util.List;
/**
 * @author cb
 */
@Component("flowRuleNacosProvider")
public class FlowRuleNacosProvider implements DynamicRuleProvider<List<FlowRuleEntity>> {

@Autowired
private ConfigService configService;
@Autowired
private Converter<String, List<FlowRuleEntity>> converter;

public static final String FLOW_DATA_ID_POSTFIX = "-sentinel";
public static final String GROUP_ID = "DEFAULT_GROUP";

@Override
public List<FlowRuleEntity> getRules(String appName) throws Exception {
    String rules = configService.getConfig(appName + FLOW_DATA_ID_POSTFIX, GROUP_ID, 3000);
    if (StringUtil.isEmpty(rules)) {
        return new ArrayList<>();
    }
    return converter.convert(rules);
}

spring.cloud.sentinel.datasource.ds.nacos.dataId=${spring.application.name}-sentinel
spring.cloud.sentinel.datasource.ds.nacos.groupId=DEFAULT_GROUP
  • f.完成了拉取远程的配置操作,我们需要将拉取的配置进行推送到sentinel平台完成展示,具体代码如下:
''''
package com.alibaba.csp.sentinel.dashboard.rule.nacos;
import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.FlowRuleEntity;
import com.alibaba.csp.sentinel.dashboard.rule.DynamicRulePublisher;
import com.alibaba.csp.sentinel.datasource.Converter;
import com.alibaba.csp.sentinel.util.AssertUtil;
import com.alibaba.nacos.api.config.ConfigService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.List;

/**
 * @author cb
 */
@Component("flowRuleNacosPublisher")
public class FlowRuleNacosPublisher implements DynamicRulePublisher<List<FlowRuleEntity>> {

    @Autowired
    private ConfigService configService;
    @Autowired
    private Converter<List<FlowRuleEntity>, String> converter;

    public static final String FLOW_DATA_ID_POSTFIX = "-sentinel";
    public static final String GROUP_ID = "DEFAULT_GROUP";

    @Override
    public void publish(String app, List<FlowRuleEntity> rules) throws Exception {
        AssertUtil.notEmpty(app, "app name cannot be empty");
        if (rules == null) {
            return;
        }
        configService.publishConfig(app + FLOW_DATA_ID_POSTFIX, GROUP_ID, converter.convert(rules));
      }
}
  • g.这也是最后一步,我们需要修该com.alibaba.csp.sentinel.dashboard.controller.v2.FlowControllerV2中DynamicRuleProvider和DynamicRulePublisher注入的bean操作,代码如下:
@Autowired
@Qualifier("flowRuleNacosProvider")
private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;
@Autowired
@Qualifier("flowRuleNacosPublisher")
private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;

限流规则的定义
</parent>
<groupId>com.alibaba.sentinel</groupId>
<artifactId>alibaba-nacos-sentinel</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>alibaba-nacos-sentinel</name>
<description>利用sentinel实现限流</description>

<properties>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- <dependency>
         <groupId>com.alibaba.cloud</groupId>
         <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
         <version>2.1.0.RELEASE</version>
     </dependency>-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    </dependency>

    <!--nacos整合sentinel-->
    <dependency>
        <groupId>com.alibaba.csp</groupId>
        <artifactId>sentinel-datasource-nacos</artifactId>
        <version>1.7.0</version>
    </dependency>

</dependencies>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Greenwich.SR3</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>0.9.0.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
  • 接下来我们来看看配置文件,代码如下:
server.port=9007
spring.application.name=alibaba-nacos
spring.cloud.sentinel.transport.dashboard=127.0.0.1:8080
spring.cloud.sentinel.datasource.ds.nacos.server-addr=127.0.0.1:8848
spring.cloud.sentinel.datasource.ds.nacos.dataId=${spring.application.name}-sentinel
spring.cloud.sentinel.datasource.ds.nacos.groupId=DEFAULT_GROUP
spring.cloud.sentinel.datasource.ds.nacos.rule-type=flow
  • 主程序,代码入下:
package com.alibaba.sentinel;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
 * @author cb
 */
@SpringBootApplication
public class AlibabaNacosSentinelApplication {
public static void main(String[] args) {
    SpringApplication.run(AlibabaNacosSentinelApplication.class, args);
  }
}
  • 测试接口代码入下;
package com.alibaba.sentinel.controller
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

@GetMapping("/hello")
public String hello(){
    return "hello Sentinel";
    }
}

  • 配置限流格式的代码如下:
   {
    "resource": "/hello",
    "limitApp": "default",
    "grade": 1,
    "count": 5,
    "strategy": 0,
    "controlBehavior": 0,
    "clusterMode": false
}

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