使用Sentinel Dashboard动态推拉数据同步到Nacos

准备工作：

下载Sentinel Dashboard的release版本。地址：https://github.com/alibaba/Sentinel/releases

一 ：修改pom.xml中的sentinel-datasource-nacos的依赖，将<scope>test</scope>注释掉，这样才能在主程序中使用。

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

 二：找到resources/app/scripts/directives/sidebar/sidebar.html中的这段代码： 

<li ui-sref-active="active">
    <a ui-sref="dashboard.flowV1({app: entry.app})">
        <i class="glyphicon glyphicon-filter"></i>&nbsp;&nbsp;流控规则
    </a>
</li>

修改为：

<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>

这样修改之后就会跳转到FlowControllerV2的接口。

三：再项目com.alibaba.csp.sentinel.dashboard中新建一个nacos包来实现扩展功能。

@Component
@ConfigurationProperties(prefix = "nacos.server")
public class NacosConfigProperties { private String ip; private String port; private String namespace; private String groupId; public String getIp() { return ip; } public void setIp(String ip) { this.ip = ip; } public String getPort() { return port; } public void setPort(String port) { this.port = port; } public String getNamespace() { return namespace; } public void setNamespace(String namespace) { this.namespace = namespace; } public String getGroupId() { return groupId; } public void setGroupId(String groupId) { this.groupId = groupId; } public String getServerAddr() { return this.getIp()+":"+this.getPort(); } @Override public String toString() { return "NacosConfigProperties [ip=" + ip + ", port=" + port + ", namespace=" + namespace + ", groupId=" + groupId + "]"; } }


public final class NacosConfigConstant { 
　　public static final String FLOW_DATA_ID_POSTFIX = "-sentinel-flow"; 
　　public static final String GROUP_ID = "DEFAULT_GROUP"; 
} 

@Configuration
public class NacosConfig { @Autowired private NacosConfigProperties nacosConfigProperties; /** * 非常关键 这里将FlowRuleEntity转换成FlowRule才会对客户端生效 * @return FlowRule */ @Bean public Converter<List<FlowRuleEntity>, String> flowRuleEntityEncoder() { return rules -> JSON.toJSONString(rules.stream().map(FlowRuleEntity::toRule).collect(Collectors.toList()), true); } @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, nacosConfigProperties.getServerAddr()); properties.put(PropertyKeyConst.NAMESPACE, nacosConfigProperties.getNamespace()); return ConfigFactory.createConfigService(properties); } }

四：编写动态推拉模式的扩展代码

@Component("flowRuleNacosProvider")
public class FlowRuleNacosProvider implements DynamicRuleProvider<List<FlowRuleEntity>> { private static Logger logger = LoggerFactory.getLogger(FlowRuleNacosProvider.class); @Autowired private NacosConfigProperties nacosConfigProperties; @Autowired private ConfigService configService; @Autowired private Converter<String, List<FlowRuleEntity>> converter; @Override public List<FlowRuleEntity> getRules(String appName) throws Exception { String rules = configService.getConfig(appName + NacosConfigConstant.FLOW_DATA_ID_POSTFIX, nacosConfigProperties.getGroupId(), 3000); logger.info("从Nacos中拉取到限流规则信息:{}",rules); if (StringUtil.isEmpty(rules)) { return new ArrayList<>(); } return converter.convert(rules); } }

@Component("flowRuleNacosPublisher")
public class FlowRuleNacosPublisher implements DynamicRulePublisher<List<FlowRuleEntity>> { @Autowired private NacosConfigProperties nacosConfigProperties; @Autowired private ConfigService configService; @Autowired private Converter<List<FlowRuleEntity>, String> converter; @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 + NacosConfigConstant.FLOW_DATA_ID_POSTFIX, nacosConfigProperties.getGroupId(), converter.convert(rules)); } }

五：然后将FlowControllerV2中的默认DynamicRuleProvider和DynamicRulePublisher修改为：

@Autowired
@Qualifier("flowRuleNacosProvider")
private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;
@Autowired
@Qualifier("flowRuleNacosPublisher")
private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;
 

private void publishRules(/*@NonNull*/ String app) throws Exception {
    List<FlowRuleEntity> rules = repository.findAllByApp(app);
    rulePublisher.publish(app, rules);
    logger.info("添加限流规则成功{}", JSON.toJSONString(rules.stream().map(FlowRuleEntity::toRule).collect(Collectors.toList()), true));
}

六：application.properties配置文件

#nacos
nacos.server.ip=localhost
nacos.server.port=8848
nacos.server.namespace=
nacos.server.group-id=DEFAULT_GROUP