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【源码解析】Nacos客户端服务注册的源码解析-创新互联

Nacos客户端服务注册的源码解析 添加pom
com.alibaba.cloudspring-cloud-starter-alibaba-nacos-discovery

在依赖中查看自动装配文件spring.factories

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org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
  com.alibaba.cloud.nacos.discovery.NacosDiscoveryAutoConfiguration,\
  com.alibaba.cloud.nacos.ribbon.RibbonNacosAutoConfiguration,\
  com.alibaba.cloud.nacos.endpoint.NacosDiscoveryEndpointAutoConfiguration,\
  com.alibaba.cloud.nacos.registry.NacosServiceRegistryAutoConfiguration,\
  com.alibaba.cloud.nacos.discovery.NacosDiscoveryClientConfiguration,\
  com.alibaba.cloud.nacos.discovery.reactive.NacosReactiveDiscoveryClientConfiguration,\
  com.alibaba.cloud.nacos.discovery.configclient.NacosConfigServerAutoConfiguration,\
  com.alibaba.cloud.nacos.NacosServiceAutoConfiguration
org.springframework.cloud.bootstrap.BootstrapConfiguration=\
  com.alibaba.cloud.nacos.discovery.configclient.NacosDiscoveryClientConfigServiceBootstrapConfiguration

NacosServiceRegistryAutoConfiguration是重点配置类。
在这里插入图片描述

NacosServiceRegistryAutoConfiguration

该类注入了3个Bean。NacosServiceRegistry，NacosRegistration，NacosAutoServiceRegistration

@Bean
	public NacosServiceRegistry nacosServiceRegistry(
			NacosDiscoveryProperties nacosDiscoveryProperties) {return new NacosServiceRegistry(nacosDiscoveryProperties);
	}

	@Bean
	@ConditionalOnBean(AutoServiceRegistrationProperties.class)
	public NacosRegistration nacosRegistration(
			ObjectProvider>registrationCustomizers,
			NacosDiscoveryProperties nacosDiscoveryProperties,
			ApplicationContext context) {return new NacosRegistration(registrationCustomizers.getIfAvailable(),
				nacosDiscoveryProperties, context);
	}

	@Bean
	@ConditionalOnBean(AutoServiceRegistrationProperties.class)
	public NacosAutoServiceRegistration nacosAutoServiceRegistration(
			NacosServiceRegistry registry,
			AutoServiceRegistrationProperties autoServiceRegistrationProperties,
			NacosRegistration registration) {return new NacosAutoServiceRegistration(registry,
				autoServiceRegistrationProperties, registration);
	}
NacosAutoServiceRegistration

NacosAutoServiceRegistration，该类继承了extends AbstractAutoServiceRegistration，会监听到WebServerInitializedEvent事件。会执行AbstractAutoServiceRegistration#start。

public void start() {if (!isEnabled()) {	if (logger.isDebugEnabled()) {		logger.debug("Discovery Lifecycle disabled. Not starting");
			}
			return;
		}

		// only initialize if nonSecurePort is greater than 0 and it isn't already running
		// because of containerPortInitializer below
		if (!this.running.get()) {	this.context.publishEvent(
					new InstancePreRegisteredEvent(this, getRegistration()));
			register();
			if (shouldRegisterManagement()) {		registerManagement();
			}
			this.context.publishEvent(
					new InstanceRegisteredEvent<>(this, getConfiguration()));
			this.running.compareAndSet(false, true);
		}

	}
服务注册

执行NacosNamingService#registerInstance()，会创建一个心跳实例并启动心跳检测定时任务，并且进行服务注册

public void registerInstance(String serviceName, String groupName, Instance instance) throws NacosException {NamingUtils.checkInstanceIsLegal(instance);
        String groupedServiceName = NamingUtils.getGroupedName(serviceName, groupName);
        if (instance.isEphemeral()) {BeatInfo beatInfo = this.beatReactor.buildBeatInfo(groupedServiceName, instance);
            this.beatReactor.addBeatInfo(groupedServiceName, beatInfo);
        }

        this.serverProxy.registerService(groupedServiceName, groupName, instance);
    }

NamingProxy#registerService，发起Http调用，接口为/nacos/v1/ns/instance。

public void registerService(String serviceName, String groupName, Instance instance) throws NacosException {
        LogUtils.NAMING_LOGGER.info("[REGISTER-SERVICE] {} registering service {} with instance: {}", new Object[]{this.namespaceId, serviceName, instance});
        Mapparams = new HashMap(16);
        params.put("namespaceId", this.namespaceId);
        params.put("serviceName", serviceName);
        params.put("groupName", groupName);
        params.put("clusterName", instance.getClusterName());
        params.put("ip", instance.getIp());
        params.put("port", String.valueOf(instance.getPort()));
        params.put("weight", String.valueOf(instance.getWeight()));
        params.put("enable", String.valueOf(instance.isEnabled()));
        params.put("healthy", String.valueOf(instance.isHealthy()));
        params.put("ephemeral", String.valueOf(instance.isEphemeral()));
        params.put("metadata", JacksonUtils.toJson(instance.getMetadata()));
        this.reqApi(UtilAndComs.nacosUrlInstance, params, "POST");
    }
发送心跳

BeatReactor#addBeatInfo，BeatReactor负责发送心跳包，默认每隔5s发送一次。

public void addBeatInfo(String serviceName, BeatInfo beatInfo) {LogUtils.NAMING_LOGGER.info("[BEAT] adding beat: {} to beat map.", beatInfo);
        String key = this.buildKey(serviceName, beatInfo.getIp(), beatInfo.getPort());
        BeatInfo existBeat = null;
        if ((existBeat = (BeatInfo)this.dom2Beat.remove(key)) != null) {existBeat.setStopped(true);
        }

        this.dom2Beat.put(key, beatInfo);
        this.executorService.schedule(new BeatReactor.BeatTask(beatInfo), beatInfo.getPeriod(), TimeUnit.MILLISECONDS);
        MetricsMonitor.getDom2BeatSizeMonitor().set((double)this.dom2Beat.size());
    }
NacosWatch

NacosWatch实现了SmartLifecycle，启动的时候会执行重写方法NacosWatch#start，该方法会进行创建NacosNamingService

总结
  1. 服务注册主要的实现就是本地发送注册请求，定时发送心跳。
  2. 其实服务注册的服务端的实现，大致也可以猜得出来。服务端维持一个以服务名为key，服务列表为value的Map数据，定时器定时清理过期的服务。接收到客户端的心跳请求，就会更新服务列表中服务的过期时间，避免被清理。

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