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springboot websocket 持续打印 pod 日志

news 2025/8/23 3:06:19

springboot 整合 websocket 和连接 k8s 集群的方式参考历史 Java 专栏文章

修改前端页面

<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>Java后端WebSocket的Tomcat实现</title><script type="text/javascript"></script>
</head><body>
<div></div>
Welcome<br/>
<div id="message"></div>
</body>
<script type="text/javascript">var websocket = null;//判断当前浏览器是否支持WebSocketif('WebSocket' in window) {//改成你的地址// websocket = new WebSocket("ws://localhost:8080/api/websocket/100");websocket = new WebSocket("ws://localhost:8080/api/websocket/pod/mm-httpbin-b549bdf48-l2fjp/container/mm-httpbin");} else {alert('当前浏览器 Not support websocket')}//连接发生错误的回调方法websocket.onerror = function() {setMessageInnerHTML("WebSocket连接发生错误");};//连接成功建立的回调方法websocket.onopen = function() {setMessageInnerHTML("WebSocket连接成功");}var U01data, Uidata, Usdata//接收到消息的回调方法websocket.onmessage = function(event) {console.log(event.data);setMessageInnerHTML(event.data);}//连接关闭的回调方法websocket.onclose = function() {setMessageInnerHTML("WebSocket连接关闭");}//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。window.onbeforeunload = function() {closeWebSocket();}//将消息显示在网页上function setMessageInnerHTML(innerHTML) {document.getElementById('message').innerHTML += innerHTML + '<br/>';}//关闭WebSocket连接function closeWebSocket() {websocket.close();}//发送消息function send() {var message = document.getElementById('text').value;websocket.send('{"msg":"' + message + '"}');setMessageInnerHTML(message + "&#13;");}
</script></html>

修改 websocket 类

命名空间测试写死了，需要可以调整

package com.vazquez.k8sclient.websocket;import com.vazquez.k8sclient.util.K8sClient;
import io.kubernetes.client.PodLogs;
import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.Configuration;
import io.kubernetes.client.util.Config;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.*;/*** @Description* @Author vazquez* @DATE 2024/4/10 8:50*/@Slf4j
@Service
@ServerEndpoint("/api/websocket/pod/{podName}/container/{containerName}")
public class PodLogWebsocket {//静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。private static int onlineCount = 0;//concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。private static CopyOnWriteArraySet<PodLogWebsocket> podLogWebsocket = new CopyOnWriteArraySet<PodLogWebsocket>();//与某个客户端的连接会话，需要通过它来给客户端发送数据private Session session;private static final ExecutorService executorService = Executors.newCachedThreadPool();private static final int RECENT_LOG_LINE = 1000;private boolean flag = true;/*** 连接建立成功调用的方法*/@OnOpenpublic void onOpen(Session session, @PathParam("podName") String podName, @PathParam("containerName") String containerName) {this.session = session;podLogWebsocket.add(this);     //加入set中addOnlineCount();           //在线数加1getPodLog(podName, containerName);try {sendMessage("conn_success");log.info("当前在线人数为:" + getOnlineCount());} catch (IOException e) {log.error("websocket IO Exception");}}/*** 连接关闭调用的方法*/@OnClosepublic void onClose() {podLogWebsocket.remove(this);  //从set中删除subOnlineCount();           //在线数减1//断开连接情况下，更新主板占用情况为释放//这里写你 释放的时候，要处理的业务log.info("有一连接关闭！当前在线人数为" + getOnlineCount());}/*** 收到客户端消息后调用的方法* @ Param message 客户端发送过来的消息*/@OnMessagepublic void onMessage(String message, Session session) {//群发消息for (PodLogWebsocket item : podLogWebsocket) {try {item.sendMessage(message);} catch (IOException e) {e.printStackTrace();}}}/*** @ Param session* @ Param error*/@OnErrorpublic void onError(Session session, Throwable error) {log.error("发生错误");error.printStackTrace();}/*** 实现服务器主动推送*/public void sendMessage(String message) throws IOException {this.session.getBasicRemote().sendText(message);}public static synchronized int getOnlineCount() {return onlineCount;}public static synchronized void addOnlineCount() {PodLogWebsocket.onlineCount++;}public static synchronized void subOnlineCount() {PodLogWebsocket.onlineCount--;}public static CopyOnWriteArraySet<PodLogWebsocket> getWebSocketSet() {return podLogWebsocket;}private void getPodLog(String podName, String containerName) {executorService.execute(() -> {BufferedReader reader = null;InputStream is = null;try {//使用单例创建ApiClientString token = "ey...cJ29w";String url = "https://10.xxx6:6443";ApiClient client = Config.fromToken(url, token, false);Configuration.setDefaultApiClient(client);PodLogs logs = new PodLogs(client);//按时间过滤stream流会有堵塞延迟is = logs.streamNamespacedPodLog("default", podName, containerName, null, RECENT_LOG_LINE, false);reader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));String line;//若ws连接已经断开，则不再读取数据输出到前端while (this.flag && this.session != null && this.session.isOpen()) {while ((line = readLineWithTimeout(podName, reader)) != null) {if (this.flag) {System.out.println(line);sendMessage(line);} else {break;}}}} catch (Exception e) {log.error("get container log Exception", e);} finally {try {if (reader != null) {reader.close();}} catch (IOException e) {log.error("reader IOException:{}", e.getMessage());}try {if (is != null) {is.close();}} catch (IOException e) {log.error("InputStreamReader IOException:{}", e.getMessage());}}});}/*** 读取一行bufferedReader数据并返回 堵塞超时返回null** @param bufferedReader* @return*/private static String readLineWithTimeout(String podName, BufferedReader bufferedReader) {Future<String> future;try {future = executorService.submit(() -> {try {return bufferedReader.readLine();} catch (IOException e) {return null;}});String message = future.get(10, TimeUnit.SECONDS);//当pod重启或删除时 由于连接会断开 future会直接返回数据为null 此时会不断请求 业务暂时添加10s休眠if (message == null) {Thread.sleep(10 * 1000);}return message;} catch (TimeoutException e) {// Timeout occurredlog.error(podName + " readLineWithTimeout " + Thread.currentThread().getId(), e);return null;} catch (InterruptedException | ExecutionException e) {e.printStackTrace();return null;}}
}