版本
Nacos 1.4.1
SpringCloud 2020.0.3
解决方案
bootstrap.properties 增加应用名配置即可
spring.application.name=service-product
(导致失效的原因可能有多种,如果上述解决方案无效,可以评论私信我具体版本)
自动更新原理
其实是借助spring重新加载配置的能力,当Nacos发现配置文件MD5不一致时,新增刷新事件,触发SpringCloud重新加载逻辑。
com.alibaba.nacos.api.config.listener.AbstractSharedListener#innerReceive 发布Refesh事件
public void innerReceive(String dataId, String group,
String configInfo) {
refreshCountIncrement();
nacosRefreshHistory.addRefreshRecord(dataId, group, configInfo);
// todo feature: support single refresh for listening
applicationContext.publishEvent(
new RefreshEvent(this, null, "Refresh Nacos config"));
if (log.isDebugEnabled()) {
log.debug(String.format(
"Refresh Nacos config group=%s,dataId=%s,configInfo=%s",
group, dataId, configInfo));
}
}
org.springframework.cloud.endpoint.event.RefreshEventListener#handle(org.springframework.cloud.endpoint.event.RefreshEvent) SpringApplication调用刷新入口
public void handle(RefreshEvent event) {
if (this.ready.get()) { // don't handle events before app is ready
log.debug("Event received " + event.getEventDesc());
Set<String> keys = this.refresh.refresh();
log.info("Refresh keys changed: " + keys);
}
}
org.springframework.boot.SpringApplication#applyInitializers 获取初始化类 如下
org.springframework.cloud.bootstrap.BootstrapApplicationListener$AncestorInitializer@1491c218
org.springframework.cloud.bootstrap.BootstrapApplicationListener$DelegatingEnvironmentDecryptApplicationInitializer@1a06e969
org.springframework.cloud.bootstrap.config.PropertySourceBootstrapConfiguration@1d443173 //Nacos的配置加载locate注册在这
org.springframework.cloud.bootstrap.encrypt.EnvironmentDecryptApplicationInitializer@6a729f71
org.springframework.boot.context.config.DelegatingApplicationContextInitializer@57ced7d3
org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer@6a2234f6
org.springframework.boot.context.ContextIdApplicationContextInitializer@7a9fa37c
org.springframework.boot.context.ConfigurationWarningsApplicationContextInitializer@35cd7790
org.springframework.boot.rsocket.context.RSocketPortInfoApplicationContextInitializer@141c4eb5
org.springframework.boot.web.context.ServerPortInfoApplicationContextInitializer@6fe25d44
org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener@68618787
com.alibaba.cloud.nacos.client.NacosPropertySourceLocator#locate 这里获取应用名 只能获取到bootstrap中配置的
原因是springCloud正常启动时会先加载application.yml,而刷新配置时不会
String dataIdPrefix = nacosConfigProperties.getPrefix();
if (StringUtils.isEmpty(dataIdPrefix)) {
dataIdPrefix = name;
}
if (StringUtils.isEmpty(dataIdPrefix)) {
dataIdPrefix = env.getProperty("spring.application.name");
}
com.alibaba.nacos.api.config.ConfigService#getConfig 这个是真正获取配置的接口