Nacos服务跨分组调用

Nacos服务跨分组调用

一、 问题背景

nacos有两种服务隔离的机制,一个是空间namespace,一般我们用namespace区分环境,另外一个是分组group,nacos的默认调用机制是同namespace下的同group的服务才可以相互调用;

那现在有个问题: 在测试阶段,由于测试环境和开发环境数据库等不一致,在测试出bug后,开发人员需要连接到测试环境上复线定位bug,但是如果开发人员本地启动测试环境,那么就会导致测试环境服务多了个本地的实例,这样测试在调用这个服务的时候很有可能就会访问这个本地服务,导致服务异常,所以一般我们都会采用本地服务自定义group分组的方式注册;

一般来说,一个服务关连多个其他服务,开发人员就需要把所有相关的服务都注册到自定义的group分组中,这样才能保证接口通常,但是起很多服务又会导致电脑内存消耗巨大,所以就想着能不能只启动存在问题的那个服务,其他关联服务还是使用测试环境的服务,基于这种考虑才想实现跨分组调用,减少无关服务的启动.

二、实现方案

1.版本要求

<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId><version>2021.0.4.0</version></dependency>

**如果 Java 项目的

nacos discovery

版本用的是

2021

以上，则不需要重写 Ribbon 的负载均衡类，因为该版本的 Nacos 不依赖 Ribbon,只需要重写服务发现即可**

2.重写服务发现

publicclassNacosServiceDiscoveryV2extendsNacosServiceDiscovery{publicNacosServiceDiscoveryV2(NacosDiscoveryProperties discoveryProperties,NacosServiceManager nacosServiceManager){super(discoveryProperties, nacosServiceManager);this.discoveryProperties = discoveryProperties;this.nacosServiceManager = nacosServiceManager;}privateNacosDiscoveryProperties discoveryProperties;privateNacosServiceManager nacosServiceManager;// 重写该方法publicList<ServiceInstance>getInstances(String serviceId)throwsNacosException{String group =this.discoveryProperties.getGroup();// 优先保证同分组下的服务调用List<Instance> instances =this.namingService().selectInstances(serviceId, group,true);if(CollUtil.isEmpty(instances)){// 如果同分组下找不到服务,那么就从默认分组下找服务
            instances =this.namingService().selectInstances(serviceId,"DEFAULT_GROUP",true);}returnhostToServiceInstanceList(instances, serviceId);}publicList<String>getServices()throwsNacosException{String group =this.discoveryProperties.getGroup();ListView<String> services =this.namingService().getServicesOfServer(1,Integer.MAX_VALUE, group);return services.getData();}publicstaticList<ServiceInstance>hostToServiceInstanceList(List<Instance> instances,String serviceId){List<ServiceInstance> result =newArrayList(instances.size());Iterator var3 = instances.iterator();while(var3.hasNext()){Instance instance =(Instance) var3.next();ServiceInstance serviceInstance =hostToServiceInstance(instance, serviceId);if(serviceInstance !=null){
                result.add(serviceInstance);}}return result;}publicstaticServiceInstancehostToServiceInstance(Instance instance,String serviceId){if(instance !=null&& instance.isEnabled()&& instance.isHealthy()){NacosServiceInstance nacosServiceInstance =newNacosServiceInstance();
            nacosServiceInstance.setHost(instance.getIp());
            nacosServiceInstance.setPort(instance.getPort());
            nacosServiceInstance.setServiceId(serviceId);
            nacosServiceInstance.setInstanceId(instance.getInstanceId());Map<String,String> metadata =newHashMap();
            metadata.put("nacos.instanceId", instance.getInstanceId());
            metadata.put("nacos.weight", instance.getWeight()+"");
            metadata.put("nacos.healthy", instance.isHealthy()+"");
            metadata.put("nacos.cluster", instance.getClusterName()+"");if(instance.getMetadata()!=null){
                metadata.putAll(instance.getMetadata());}

            metadata.put("nacos.ephemeral",String.valueOf(instance.isEphemeral()));
            nacosServiceInstance.setMetadata(metadata);if(metadata.containsKey("secure")){boolean secure =Boolean.parseBoolean((String) metadata.get("secure"));
                nacosServiceInstance.setSecure(secure);}return nacosServiceInstance;}else{returnnull;}}privateNamingServicenamingService(){returnthis.nacosServiceManager.getNamingService();}}

3.重写自动配置类,更早的加载到Nacos容器中

@Configuration(proxyBeanMethods =false)@ConditionalOnDiscoveryEnabled@ConditionalOnNacosDiscoveryEnabled@AutoConfigureBefore({NacosDiscoveryAutoConfiguration.class})publicclassNacosDiscoveryAutoConfigurationV2{@Bean@ConditionalOnMissingBeanpublicNacosServiceDiscoverynacosServiceDiscovery(NacosDiscoveryProperties nacosDiscoveryProperties,NacosServiceManager nacosServiceManager){returnnewNacosServiceDiscoveryV2(nacosDiscoveryProperties, nacosServiceManager);}}

其他版本的nacos的话,可能需要借助Ribbon负载均衡来处理跨分组调用,具体可参考以下:

参考:

• https://blog.csdn.net/m0_71777195/article/details/128350690