0. 环境
- nacos版本:1.4.1
- Spring Cloud : 2020.0.2
- Spring Boot :2.4.4
- Spring Cloud alibaba: 2.2.5.RELEASE
1. 服务端接收心跳
这个心跳请求是走了InstanceController 的beat 方法处理的,代码如下:
@CanDistro
@PutMapping("/beat")
@Secured(parser = NamingResourceParser.class, action = ActionTypes.WRITE)
public ObjectNode beat(HttpServletRequest request) throws Exception {
// 创建一个JSON Node,该方法的返回值就是它,后面的代码就是对这个Node进行各种初始化
ObjectNode result = JacksonUtils.createEmptyJsonNode();
result.put(SwitchEntry.CLIENT_BEAT_INTERVAL, switchDomain.getClientBeatInterval());
// 从请求中获取到beat,即client端的beatInfo
String beat = WebUtils.optional(request, "beat", StringUtils.EMPTY);
RsInfo clientBeat = null;
// 将beat构建为clientBeat
if (StringUtils.isNotBlank(beat)) {
clientBeat = JacksonUtils.toObj(beat, RsInfo.class);
}
String clusterName = WebUtils
.optional(request, CommonParams.CLUSTER_NAME, UtilsAndCommons.DEFAULT_CLUSTER_NAME);
String ip = WebUtils.optional(request, "ip", StringUtils.EMPTY);
// 获取到客户端传递来的client的port,其将来用于UDP通信
int port = Integer.parseInt(WebUtils.optional(request, "port", "0"));
if (clientBeat != null) {
if (StringUtils.isNotBlank(clientBeat.getCluster())) {
clusterName = clientBeat.getCluster();
} else {
// fix #2533

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