聊聊NacosDiscoveryHealthIndicatorAutoConfiguration

序

本文主要研究一下 NacosDiscoveryHealthIndicatorAutoConfiguration

NacosDiscoveryHealthIndicatorAutoConfiguration

nacos-spring-boot-project/nacos-discovery-spring-boot-actuator/src/main/java/com/alibaba/boot/nacos/discovery/actuate/autoconfigure/NacosDiscoveryHealthIndicatorAutoConfiguration.java

@Configuration
@ConditionalOnClass({HealthIndicator.class})
@AutoConfigureBefore({EndpointAutoConfiguration.class})
@AutoConfigureAfter(NacosDiscoveryAutoConfiguration.class)
@ConditionalOnEnabledHealthIndicator(NacosDiscoveryConstants.ENDPOINT_PREFIX)
public class NacosDiscoveryHealthIndicatorAutoConfiguration {

    @Bean
    @ConditionalOnMissingBean
    public NacosDiscoveryHealthIndicator nacosDiscoveryHealthIndicator() {return new NacosDiscoveryHealthIndicator();
    }

}

• NacosDiscoveryHealthIndicatorAutoConfiguration 注册了 NacosDiscoveryHealthIndicator

NacosDiscoveryHealthIndicator

nacos-spring-boot-project/nacos-discovery-spring-boot-actuator/src/main/java/com/alibaba/boot/nacos/discovery/actuate/health/NacosDiscoveryHealthIndicator.java

public class NacosDiscoveryHealthIndicator extends AbstractHealthIndicator {

    @Autowired
    private ApplicationContext applicationContext;

    private static final String UP_STATUS = "up";

    @Override
    protected void doHealthCheck(Health.Builder builder) throws Exception {builder.up();
        NacosServiceFactory nacosServiceFactory = CacheableEventPublishingNacosServiceFactory.getSingleton();
        for (NamingService namingService : nacosServiceFactory.getNamingServices()) {if (namingService instanceof NacosServiceMetaData) {NacosServiceMetaData nacosServiceMetaData = (NacosServiceMetaData) namingService;
                Properties properties = nacosServiceMetaData.getProperties();
                builder.withDetail(
                        JSON.toJSONString(PropertiesUtils.extractSafeProperties(properties)),
                        namingService.getServerStatus());
            }
            if (!namingService.getServerStatus().equalsIgnoreCase(UP_STATUS)) {builder.down();
            }
        }
    }
}

• NacosDiscoveryHealthIndicator 继承了 AbstractHealthIndicator，其 doHealthCheck 方法会遍历 namingService，如果 namingService 为 NacosServiceMetaData 则将 properties 的 json 作为 key，serverStatus 作为 value 填充到 detail 中；接着判断其 serverStatus 是否为 up，不是的话则标记为 down

小结

NacosDiscoveryHealthIndicatorAutoConfiguration 注册了 NacosDiscoveryHealthIndicator；NacosDiscoveryHealthIndicator 继承了 AbstractHealthIndicator，其 doHealthCheck 方法会遍历 namingService，如果 namingService 为 NacosServiceMetaData 则将 properties 的 json 作为 key，serverStatus 作为 value 填充到 detail 中；接着判断其 serverStatus 是否为 up，不是的话则标记为 down

doc

• NacosDiscoveryHealthIndicatorAutoConfiguration