关于eureka:聊聊如何基于eureka元数据扩展namespace功能

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前言

最近敌人部门接手供方微服务项目过去运维,那套微服务的技术栈是 springcloud Netflix,和敌人部门的微服务技术栈刚好匹配。过后敌人部门的想法,既然都是同一套技术体系,那些根底服务治理组件比方注册核心之类,就共用同一套。然而在落地施行的过程中,发现供方提供的微服务项目服务有些 serviceId 和敌人部门他们已有服务 serviceId 名字居然截然不同。这样就有问题了,eureka 服务发现是通过 serviceId 辨认

敌人部门的策略是将供方微服务项目 serviceId 改掉,比方本来 serviceId 是 user,就改成 xxx-user。然而调整后,发现供方微服务某些微服务会报错,前面理解到供方仅提供应用层代码,有些外围代码库他们是不提供的。敌人他们部门也思考要不就替换本人已有服务的 serviceId,后边发现可行性也不大,因为敌人他们微服务也对其余部门输入了一些能力,如果改变,就得告诉相干方进行改变,这边会波及到一些沟通老本等非技术性因素。

后边敌人就和我交换了一下计划。首先问题点的实质是 serviceId 一样引起的吗?乍看一下,如同是这样。咱们换个角度思考这个问题,是不是也能够说是因为隔离性做得不够好导致。于是我就跟敌人说,如果把 eureka 切换成 nacos,对你部门的切换老本大不大。敌人说代码层尽管仅需切换 jar 和配置即可实现,然而因为版本起因,如果切换,他们也只能用到 nacos 1 版本的能力。其次他部门对注册核心的性能要求也不高,但对注册核心的稳定性要求比拟高,如果切换,他们须要做很多测试方面的工作,仅仅只是因为这个隔离性,他更偏向部署多个 eureka。

聊到前面敌人就在吐槽 eureka,为啥不能像 nacos 或者 k8s 那样搞个 namespace 来做隔离。基于敌人这个想法,我就跟他说,我帮你扩大一下,让 eureka 也领有仿 nacos namespace 的能力

实现思路

注: 本文以敌人他们公司的微服务版本 springcloud Hoxton.SR3 来解说

实现的外围逻辑:利用注册核心都有的元数据,即 metaMap,以及配合注册核心具备的服务发现能力进行扩大

外围实现逻辑

1、元数据扩大

a、新建扩大配置类

@ConfigurationProperties(prefix = "eureka.instance.ext")
@Data
@AllArgsConstructor
@NoArgsConstructor
public class EurekaInstanceProperties {

    private String namespace = Constant.META_INFO_DEAFULT_NAMESPACE;

    private String group = Constant.META_INFO_DEAFULT_GROUP;

    private boolean loadBalanceAllowCross;

}

b、元数据扩大填充

public class EurekaInstanceSmartInitializingSingleton implements SmartInitializingSingleton, ApplicationContextAware {


    private ApplicationContext applicationContext;

    @Override
    public void afterSingletonsInstantiated() {EurekaInstanceProperties eurekaInstanceProperties = applicationContext.getBean(EurekaInstanceProperties.class);
        EurekaInstanceConfigBean bean = applicationContext.getBean(EurekaInstanceConfigBean.class);
        Map<String, String> metadataMap = bean.getMetadataMap();
        metadataMap.put(Constant.META_INFO_KEY_NAMESPACE,eurekaInstanceProperties.getNamespace());
        metadataMap.put(Constant.META_INFO_KEY_GROUP,eurekaInstanceProperties.getGroup());

    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.applicationContext = applicationContext;}
}

2、eureka 服务端面板革新

a、status.ftlh 页面逻辑革新

在我的项目 eureka 服务端的 src/main/resource 目录下新建 /templates/eureka 文件夹,将 eureka 本来有的 status.ftlh 拷贝过去,因为咱们要对这个 status.ftlh 进行革新。而 status.ftlh 本来地位是放在

在 status.ftlh 增加如下内容

b、微调 EurekaController 内容

EurekaController 是 eureka 服务用来面板展现的控制器,能够在 eureka 的服务端的我的项目建一个 EurekaController 截然不同的类,形如

注: 也能够本人自定义一个 controller,反正这个 controller 就是用来页面渲染用的

对如下办法进行微调

org.springframework.cloud.netflix.eureka.server.EurekaController#populateApps

微调内容如下

    for (InstanceInfo info : app.getInstances()) {String id = info.getId();
                String url = info.getStatusPageUrl();
                Map<String, String> metadata = info.getMetadata();
                String group = StringUtils.isEmpty(metadata.get("group")) ? "default" : metadata.get("group");
                String namespace = StringUtils.isEmpty(metadata.get("namespace")) ? "default" : metadata.get("namespace");
                String metaInfo = url + "_" + namespace + "_" + group;
            
                List<Pair<String, String>> list = instancesByStatus
                        .computeIfAbsent(status, k -> new ArrayList<>());
                list.add(new Pair<>(id, metaInfo));
            }
        
            for (Map.Entry<InstanceInfo.InstanceStatus, List<Pair<String, String>>> entry : instancesByStatus
                    .entrySet()) {List<Pair<String, String>> value = entry.getValue();
                InstanceInfo.InstanceStatus status = entry.getKey();
                LinkedHashMap<String, Object> instanceData = new LinkedHashMap<>();
        

                for (Pair<String, String> p : value) {LinkedHashMap<String, Object> instance = new LinkedHashMap<>();
                    instances.add(instance);
                    instance.put("id", p.first());
                    String metaInfo = p.second();
                    String[] metaInfoArr = metaInfo.split("_");
                    String url = metaInfoArr[0];
                    instance.put("url", url);
                    String namespace = metaInfoArr[1];
                    instance.put("namespace", namespace);
                    String group = metaInfoArr[2];
                    instance.put("group", group);
                    boolean isHref = url != null && url.startsWith("http");
                    instance.put("isHref", isHref);
                
        }
        model.put("apps", apps);

c、革新后的面板展现

注: 在 eureka 的客户端需配形如下配置

3、服务发现革新

a、重写 com.netflix.loadbalancer.ServerList

参照 eureka 的服务发现配置类

    @Bean
    @ConditionalOnMissingBean
    public ServerList<?> ribbonServerList(IClientConfig config,
            Provider<EurekaClient> eurekaClientProvider) {if (this.propertiesFactory.isSet(ServerList.class, serviceId)) {return this.propertiesFactory.get(ServerList.class, config, serviceId);
        }
        DiscoveryEnabledNIWSServerList discoveryServerList = new DiscoveryEnabledNIWSServerList(config, eurekaClientProvider);
        DomainExtractingServerList serverList = new DomainExtractingServerList(discoveryServerList, config, this.approximateZoneFromHostname);
        return serverList;
    }

咱们能够发现咱们仅需革新 DiscoveryEnabledNIWSServerList 即可

@Slf4j
public class CustomDiscoveryEnabledNIWSServerList extends DiscoveryEnabledNIWSServerList {

    private final Provider<EurekaClient> eurekaClientProvider;
    private final EurekaInstanceProperties eurekaInstanceProperties;

    public CustomDiscoveryEnabledNIWSServerList(IClientConfig clientConfig, Provider<EurekaClient> eurekaClientProvider,EurekaInstanceProperties eurekaInstanceProperties) {
        this.eurekaClientProvider = eurekaClientProvider;
        this.eurekaInstanceProperties = eurekaInstanceProperties;
        initWithNiwsConfig(clientConfig);
    }

    @Override
    public List<DiscoveryEnabledServer> getInitialListOfServers(){List<DiscoveryEnabledServer> initialListOfServers = super.getInitialListOfServers();

        return selectListOfServersByMetaInfo(initialListOfServers);

    }

    @Override
    public List<DiscoveryEnabledServer> getUpdatedListOfServers(){List<DiscoveryEnabledServer> updatedListOfServers = super.getUpdatedListOfServers();
        return selectListOfServersByMetaInfo(updatedListOfServers);

    }

    private List<DiscoveryEnabledServer> selectListOfServersByMetaInfo(List<DiscoveryEnabledServer> discoveryEnabledServerList){List<DiscoveryEnabledServer> discoveryEnabledServersByMetaInfo = new ArrayList<>();
        if(!CollectionUtils.isEmpty(discoveryEnabledServerList)){for (DiscoveryEnabledServer discoveryEnabledServer : discoveryEnabledServerList) {Map<String, String> metadata = discoveryEnabledServer.getInstanceInfo().getMetadata();
                String namespace = metadata.get(Constant.META_INFO_KEY_NAMESPACE);
                String group = metadata.get(Constant.META_INFO_KEY_GROUP);
                if(eurekaInstanceProperties.getNamespace().equals(namespace) &&
                        eurekaInstanceProperties.getGroup().equals(group)){discoveryEnabledServersByMetaInfo.add(discoveryEnabledServer);
                }

            }
        }

        if(CollectionUtils.isEmpty(discoveryEnabledServersByMetaInfo) &&
                eurekaInstanceProperties.isLoadBalanceAllowCross()){log.warn("not found enabledServerList in namespace :【{}】and group :【{}】. will select default enabledServerList by isLoadBalanceAllowCross is {}",eurekaInstanceProperties.getNamespace(),eurekaInstanceProperties.getGroup(),eurekaInstanceProperties.isLoadBalanceAllowCross());
            return discoveryEnabledServerList;
        }

        return discoveryEnabledServersByMetaInfo;
    }


}

b、配置咱们重写后的 ServerList

@Configuration
public class EurekaClientAutoConfiguration extends EurekaRibbonClientConfiguration{@Value("${ribbon.eureka.approximateZoneFromHostname:false}")
    private boolean approximateZoneFromHostname = false;

    @RibbonClientName
    private String serviceId = "client";;


    @Autowired
    private PropertiesFactory propertiesFactory;



    @Bean
    @Primary
    public ServerList<?> ribbonServerList(IClientConfig config,
                                    Provider<EurekaClient> eurekaClientProvider, EurekaInstanceProperties properties) {if (this.propertiesFactory.isSet(ServerList.class, serviceId)) {return this.propertiesFactory.get(ServerList.class, config, serviceId);
        }
        DiscoveryEnabledNIWSServerList discoveryServerList = new CustomDiscoveryEnabledNIWSServerList(config, eurekaClientProvider,properties);
        DomainExtractingServerList serverList = new DomainExtractingServerList(discoveryServerList, config, this.approximateZoneFromHostname);
        return serverList;
    }
}

c、批改 ribbionclient 的默认配置

@Configuration(proxyBeanMethods = false)
@EnableConfigurationProperties
@ConditionalOnRibbonAndEurekaEnabled
@AutoConfigureAfter(RibbonAutoConfiguration.class)
@RibbonClients(defaultConfiguration = EurekaClientAutoConfiguration.class)
public class RibbonEurekaAutoConfiguration {}

测试

示例服务:网关、消费者服务、提供者服务、eureka

相干的 eureka 配置内容如下

1、网关:

网关占用端口:8000

eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
    prefer-ip-address: ${PREFER_IP:true}  #是否抉择 IP 注册
 #   ip-address: ${IP_ADDRESS:localhost}   #指定 IP 地址注册
    lease-renewal-interval-in-seconds: 5  #续约更新工夫距离(默认 30 秒), 使得 eureka 及时剔除有效服务
    lease-expiration-duration-in-seconds: 10 #续约到期工夫(默认 90 秒)hostname: ${HOSTNAME:${spring.application.name}}
    ext:
      namespace: dev
      group: lybgeek

  client:
    service-url:
      defaultZone: ${EUREKA_CLIENT_SERVICEURL_DEFAULTZONE:http://localhost:8761/eureka/}
      #缩短提早向服务端注册的工夫、默认 40s
    initial-instance-info-replication-interval-seconds: 10
    #进步 Eureka-Client 端拉取 Server 注册信息的频率, 默认 30s
    registry-fetch-interval-seconds: 5

2、消费者

消费者 1: 占用端口:6614

eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
    prefer-ip-address: ${PREFER_IP:true}  #是否抉择 IP 注册
 #   ip-address: ${IP_ADDRESS:localhost}   #指定 IP 地址注册
    lease-renewal-interval-in-seconds: 5  #续约更新工夫距离(默认 30 秒), 使得 eureka 及时剔除有效服务
    lease-expiration-duration-in-seconds: 10 #续约到期工夫(默认 90 秒)hostname: ${HOSTNAME:${spring.application.name}}
    ext:
      group: lybgeek
      namespace: dev
  client:
    service-url:
      defaultZone: ${EUREKA_CLIENT_SERVICEURL_DEFAULTZONE:http://localhost:8761/eureka/}
      #缩短提早向服务端注册的工夫、默认 40s
    initial-instance-info-replication-interval-seconds: 10
    #进步 Eureka-Client 端拉取 Server 注册信息的频率, 默认 30s
    registry-fetch-interval-seconds: 5

消费者 2: 占用端口:6613

eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
    prefer-ip-address: ${PREFER_IP:true}  #是否抉择 IP 注册
 #   ip-address: ${IP_ADDRESS:localhost}   #指定 IP 地址注册
    lease-renewal-interval-in-seconds: 5  #续约更新工夫距离(默认 30 秒), 使得 eureka 及时剔除有效服务
    lease-expiration-duration-in-seconds: 10 #续约到期工夫(默认 90 秒)hostname: ${HOSTNAME:${spring.application.name}}
    ext:
      group: lybgeek6613
      namespace: dev
  client:
    service-url:
      defaultZone: ${EUREKA_CLIENT_SERVICEURL_DEFAULTZONE:http://localhost:8761/eureka/}
      #缩短提早向服务端注册的工夫、默认 40s
    initial-instance-info-replication-interval-seconds: 10
    #进步 Eureka-Client 端拉取 Server 注册信息的频率, 默认 30s
    registry-fetch-interval-seconds: 5

管制层示例

@RestController
@RequestMapping("instance")
public class InstanceInfoController {

    @InstancePort
    private String port;

    @InstanceName
    private String instanceName;

    @Autowired
    private InstanceServiceFeign instanceServiceFeign;

    @GetMapping("list")
    public List<InstanceInfo> list(){List<InstanceInfo> instanceInfos = new ArrayList<>();
        InstanceInfo comsumeInstanceInfo = InstanceInfo.builder()
                .port(port).name(instanceName).build();
        instanceInfos.add(comsumeInstanceInfo);
        InstanceInfo providerInstanceInfo = null;
        try {providerInstanceInfo = instanceServiceFeign.getInstanceInfo();
            instanceInfos.add(providerInstanceInfo);
        } catch (Exception e) {e.printStackTrace();
        }


        return instanceInfos;

    }
}

3、提供者

提供者 1: 占用端口:6605

eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
    prefer-ip-address: ${PREFER_IP:true}  #是否抉择 IP 注册
 #   ip-address: ${IP_ADDRESS:localhost}   #指定 IP 地址注册
    lease-renewal-interval-in-seconds: 5  #续约更新工夫距离(默认 30 秒), 使得 eureka 及时剔除有效服务
    lease-expiration-duration-in-seconds: 10 #续约到期工夫(默认 90 秒)hostname: ${HOSTNAME:${spring.application.name}}
    ext:
      namespace: dev
      group: lybgeek
  client:
    service-url:
      defaultZone: ${EUREKA_CLIENT_SERVICEURL_DEFAULTZONE:http://localhost:8761/eureka/}
      #缩短提早向服务端注册的工夫、默认 40s
    initial-instance-info-replication-interval-seconds: 10
    #进步 Eureka-Client 端拉取 Server 注册信息的频率, 默认 30s
    registry-fetch-interval-seconds: 5

提供者 2: 占用端口:6604

eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
    prefer-ip-address: ${PREFER_IP:true}  #是否抉择 IP 注册
 #   ip-address: ${IP_ADDRESS:localhost}   #指定 IP 地址注册
    lease-renewal-interval-in-seconds: 5  #续约更新工夫距离(默认 30 秒), 使得 eureka 及时剔除有效服务
    lease-expiration-duration-in-seconds: 10 #续约到期工夫(默认 90 秒)hostname: ${HOSTNAME:${spring.application.name}}
    ext:
      namespace: dev
      group: lybgeek6613
  client:
    service-url:
      defaultZone: ${EUREKA_CLIENT_SERVICEURL_DEFAULTZONE:http://localhost:8761/eureka/}
      #缩短提早向服务端注册的工夫、默认 40s
    initial-instance-info-replication-interval-seconds: 10
    #进步 Eureka-Client 端拉取 Server 注册信息的频率, 默认 30s
    registry-fetch-interval-seconds: 5

管制层示例

@RestController
@RequestMapping(InstanceServiceFeign.PATH)
public class InstanceServiceFeignImpl implements InstanceServiceFeign {

    @InstancePort
    private String port;

    @InstanceName
    private String instanceName;


    @Override
    public InstanceInfo getInstanceInfo() {return InstanceInfo.builder()
                .name(instanceName).port(port).build();}
}

拜访 eureka 面板

通过网关拜访会发现不论拜访多少次,网关只能命中 namespace 为 dev、group 为 lybgeek 的服务,阐明隔离成果失效

当咱们的服务和其余服务不属于同个 namespace 或者 group 时,能够通过配置 load-balance-allow-cross: true,实现跨 namespace 和 group 拜访。配置形如下

eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
    prefer-ip-address: ${PREFER_IP:true}  #是否抉择 IP 注册
 #   ip-address: ${IP_ADDRESS:localhost}   #指定 IP 地址注册
    lease-renewal-interval-in-seconds: 5  #续约更新工夫距离(默认 30 秒), 使得 eureka 及时剔除有效服务
    lease-expiration-duration-in-seconds: 10 #续约到期工夫(默认 90 秒)hostname: ${HOSTNAME:${spring.application.name}}
    ext:
      namespace: dev
      group: lybgeek123
      load-balance-allow-cross: true

咱们再通过网关拜访一下

察看控制台,会发现呈现正告

总结

本文次要是仿造 nacos 的一些思路,对 eureka 进行扩大。其实注册核心的性能大同小异,尤其集成 springcloud 后,基本上都有固定套路了。本文只是实现 eureka 服务发现隔离的一种形式,也能够通过 eureka 自身的 zone 和 region,通过自定义负载平衡策略来实现。最初 eureka instance 其实也有 namespace 的属性,只是在 springcloud 集成,被忽略了

demo 链接

https://github.com/lyb-geek/springboot-cloud-metadata-ext

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