nacos
nacos
nacos扮演了两种功能，一个是服务发现，一个是配置中心。
分别由两个jar包扮演。
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
其中，
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
在该starter中，META-INF/spring.factories中，指定了如下几个自动配置类：
// 1
org.springframework.cloud.bootstrap.BootstrapConfiguration=\
com.alibaba.cloud.nacos.NacosConfigBootstrapConfiguration
// 2
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.alibaba.cloud.nacos.NacosConfigAutoConfiguration,\
com.alibaba.cloud.nacos.endpoint.NacosConfigEndpointAutoConfiguration
org.springframework.boot.diagnostics.FailureAnalyzer=\
com.alibaba.cloud.nacos.diagnostics.analyzer.NacosConnectionFailureAnalyzer
NacosConfigBootstrapConfiguration
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(name = "spring.cloud.nacos.config.enabled", matchIfMissing = true)
public class NacosConfigBootstrapConfiguration {
// 1
@Bean
@ConditionalOnMissingBean
public NacosConfigProperties nacosConfigProperties() {
return new NacosConfigProperties();
}
// 2
@Bean
@ConditionalOnMissingBean
public NacosConfigManager nacosConfigManager(
NacosConfigProperties nacosConfigProperties) {
return new NacosConfigManager(nacosConfigProperties);
}
// 3
@Bean
public NacosPropertySourceLocator nacosPropertySourceLocator(
NacosConfigManager nacosConfigManager) {
return new NacosPropertySourceLocator(nacosConfigManager);
}
}
以上这几个bean中，3依赖2，2依赖1.
NacosConfigAutoConfiguration
/**
* @author juven.xuxb
*/
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(name = "spring.cloud.nacos.config.enabled", matchIfMissing = true)
public class NacosConfigAutoConfiguration {
@Bean
public NacosConfigProperties nacosConfigProperties(ApplicationContext context) {
if (context.getParent() != null
&& BeanFactoryUtils.beanNamesForTypeIncludingAncestors(
context.getParent(), NacosConfigProperties.class).length > 0) {
return BeanFactoryUtils.beanOfTypeIncludingAncestors(context.getParent(),
NacosConfigProperties.class);
}
return new NacosConfigProperties();
}
@Bean
public NacosRefreshProperties nacosRefreshProperties() {
return new NacosRefreshProperties();
}
@Bean
public NacosRefreshHistory nacosRefreshHistory() {
return new NacosRefreshHistory();
}
@Bean
public NacosConfigManager nacosConfigManager(
NacosConfigProperties nacosConfigProperties) {
return new NacosConfigManager(nacosConfigProperties);
}
@Bean
public NacosContextRefresher nacosContextRefresher(
NacosConfigManager nacosConfigManager,
NacosRefreshHistory nacosRefreshHistory) {
// Consider that it is not necessary to be compatible with the previous
// configuration
// and use the new configuration if necessary.
return new NacosContextRefresher(nacosConfigManager, nacosRefreshHistory);
}
}
NacosConfigEndpointAutoConfiguration
/*
* Copyright 2013-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.cloud.nacos.endpoint;
import com.alibaba.cloud.nacos.NacosConfigManager;
import com.alibaba.cloud.nacos.refresh.NacosRefreshHistory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.autoconfigure.endpoint.condition.ConditionalOnEnabledEndpoint;
import org.springframework.boot.actuate.autoconfigure.health.ConditionalOnEnabledHealthIndicator;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.context.annotation.Bean;
/**
* @author xiaojing
*/
@ConditionalOnWebApplication
@ConditionalOnClass(Endpoint.class)
@ConditionalOnProperty(name = "spring.cloud.nacos.config.enabled", matchIfMissing = true)
public class NacosConfigEndpointAutoConfiguration {
@Autowired
private NacosConfigManager nacosConfigManager;
@Autowired
private NacosRefreshHistory nacosRefreshHistory;
@ConditionalOnMissingBean
@ConditionalOnEnabledEndpoint
@Bean
public NacosConfigEndpoint nacosConfigEndpoint() {
return new NacosConfigEndpoint(nacosConfigManager.getNacosConfigProperties(),
nacosRefreshHistory);
}
@Bean
@ConditionalOnMissingBean
@ConditionalOnEnabledHealthIndicator("nacos-config")
public NacosConfigHealthIndicator nacosConfigHealthIndicator() {
return new NacosConfigHealthIndicator(nacosConfigManager.getConfigService());
}
}
ribbon和nacos自动装配
RibbonAutoConfiguration
spring-cloud-alibaba-nacos-discovery
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.alibaba.cloud.nacos.NacosDiscoveryAutoConfiguration,\
com.alibaba.cloud.nacos.ribbon.RibbonNacosAutoConfiguration,\
com.alibaba.cloud.nacos.endpoint.NacosDiscoveryEndpointAutoConfiguration,\
com.alibaba.cloud.nacos.discovery.NacosDiscoveryClientAutoConfiguration,\
com.alibaba.cloud.nacos.discovery.configclient.NacosConfigServerAutoConfiguration
org.springframework.cloud.bootstrap.BootstrapConfiguration=\
com.alibaba.cloud.nacos.discovery.configclient.NacosDiscoveryClientConfigServiceBootstrapConfiguration
服务上下线
简介
有个定时任务，会一直取获取服务列表：
com.alibaba.nacos.client.naming.core.HostReactor.UpdateTask
public class UpdateTask implements Runnable {
long lastRefTime = Long.MAX_VALUE;
private String clusters;
private String serviceName;
public UpdateTask(String serviceName, String clusters) {
this.serviceName = serviceName;
this.clusters = clusters;
}
@Override
public void run() {
try {
ServiceInfo serviceObj = serviceInfoMap.get(ServiceInfo.getKey(serviceName, clusters));
if (serviceObj == null) {
// 1
updateServiceNow(serviceName, clusters);
executor.schedule(this, DEFAULT_DELAY, TimeUnit.MILLISECONDS);
return;
}
if (serviceObj.getLastRefTime() <= lastRefTime) {
// 2
updateServiceNow(serviceName, clusters);
serviceObj = serviceInfoMap.get(ServiceInfo.getKey(serviceName, clusters));
} else {
// if serviceName already updated by push, we should not override it
// since the push data may be different from pull through force push
refreshOnly(serviceName, clusters);
}
lastRefTime = serviceObj.getLastRefTime();
if (!eventDispatcher.isSubscribed(serviceName, clusters) &&
!futureMap.containsKey(ServiceInfo.getKey(serviceName, clusters))) {
// abort the update task:
NAMING_LOGGER.info("update task is stopped, service:" + serviceName + ", clusters:" + clusters);
return;
}
executor.schedule(this, serviceObj.getCacheMillis(), TimeUnit.MILLISECONDS);
} catch (Throwable e) {
NAMING_LOGGER.warn("[NA] failed to update serviceName: " + serviceName, e);
}
}
}
执行上面的1，2处时，最终调用如下：
com.alibaba.nacos.client.naming.core.HostReactor#updateServiceNow
public void updateServiceNow(String serviceName, String clusters) {
ServiceInfo oldService = getServiceInfo0(serviceName, clusters);
try {
// 1
String result = serverProxy.queryList(serviceName, clusters, pushReceiver.getUDPPort(), false);
if (StringUtils.isNotEmpty(result)) {
processServiceJSON(result);
}
} catch (Exception e) {
NAMING_LOGGER.error("[NA] failed to update serviceName: " + serviceName, e);
} finally {
if (oldService != null) {
synchronized (oldService) {
oldService.notifyAll();
}
}
}
}
1处，继续：
com.alibaba.nacos.client.naming.net.NamingProxy#queryList
public String queryList(String serviceName, String clusters, int udpPort, boolean healthyOnly)
throws NacosException {
final Map<String, String> params = new HashMap<String, String>(8);
params.put(CommonParams.NAMESPACE_ID, namespaceId);
params.put(CommonParams.SERVICE_NAME, serviceName);
params.put("clusters", clusters);
params.put("udpPort", String.valueOf(udpPort));
params.put("clientIP", NetUtils.localIP());
params.put("healthyOnly", String.valueOf(healthyOnly));
return reqAPI(UtilAndComs.NACOS_URL_BASE + "/instance/list", params, HttpMethod.GET);
}
public String reqAPI(String api, Map<String, String> params, String body, String method) throws NacosException {
return reqAPI(api, params, body, getServerList(), method);
}
com.alibaba.nacos.client.naming.net.NamingProxy#callServer()
public String callServer(String api, Map<String, String> params, String body, String curServer, String method)
throws NacosException {
long start = System.currentTimeMillis();
long end = 0;
injectSecurityInfo(params);
List<String> headers = builderHeaders();
String url;
if (curServer.startsWith(UtilAndComs.HTTPS) || curServer.startsWith(UtilAndComs.HTTP)) {
url = curServer + api;
} else {
if (!curServer.contains(UtilAndComs.SERVER_ADDR_IP_SPLITER)) {
curServer = curServer + UtilAndComs.SERVER_ADDR_IP_SPLITER + serverPort;
}
url = HttpClient.getPrefix() + curServer + api;
}
// 1
HttpClient.HttpResult result = HttpClient.request(url, headers, params, body, UtilAndComs.ENCODING, method);
end = System.currentTimeMillis();
MetricsMonitor.getNamingRequestMonitor(method, url, String.valueOf(result.code))
.observe(end - start);
if (HttpURLConnection.HTTP_OK == result.code) {
return result.content;
}
if (HttpURLConnection.HTTP_NOT_MODIFIED == result.code) {
return StringUtils.EMPTY;
}
throw new NacosException(result.code, result.content);
}
上面这个类，处于nacos-client.jar中，上面1处，就是根据url，去获取服务列表。
下面用wireshark抓包看看。
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