SpringBoot + WebSocket 连接泄漏监控:用户退出未断连?自动清理僵尸连接
引言
在现代Web应用中,WebSocket作为一种全双工通信协议,被广泛应用于实时消息推送、在线协作、即时通讯等场景。然而,在生产环境中,WebSocket连接管理往往面临着严峻的挑战:用户直接关闭浏览器标签页而非点击退出按钮、 网络不稳定导致的连接中断、用户长时间不操作但连接依然保持……这些情况都会导致"僵尸连接"的产生,即服务器认为连接仍然存活,但实际上客户端已经不再使用。
本文将深入探讨WebSocket连接泄漏的问题,分析其成因,并详细介绍如何在Spring Boot应用中实现连接泄漏的监控和僵尸连接的自动清理机制,确保WebSocket服务的高可用性。
问题背景
什么是WebSocket连接泄漏
WebSocket连接泄漏是指WebSocket连接在客户端已经不再使用的情况下,服务器端依然保持该连接,导致以下问题:
- 连接资源浪费:每个WebSocket连接都会占用服务器的文件描述符和内存资源
- 服务器负载增加:大量僵尸连接会消耗服务器资源,影响正常用户的使用
- Session信息泄漏:如果使用Session存储用户信息,僵尸连接会导致Session无法及时释放
- 消息推送无效:向僵尸连接推送消息是无效的,浪费服务器资源
连接泄漏的常见原因
在实际生产环境中,WebSocket连接泄漏可能由多种原因引起:
- 客户端未正确关闭连接:用户直接关闭浏览器或标签页,而非通过代码关闭WebSocket连接
- 网络异常中断:网络波动或中断导致连接异常终止,服务器未收到关闭帧
- 防火墙/负载均衡器超时:中间设备的超时设置比服务器短,导致连接被意外关闭
- 应用异常退出:客户端应用异常退出,未能发送关闭帧
- 心跳超时未检测:服务器未能及时检测到客户端心跳超时
- 服务器重启:服务器重启时,未能正确通知客户端重连
连接泄漏的严重性
如果不及时处理WebSocket连接泄漏问题,会导致以下严重后果:
- 资源耗尽:文件描述符、内存、线程等资源被耗尽,导致服务不可用
- 服务崩溃:当连接数达到系统限制时,可能导致服务器崩溃
- 用户体验下降:新用户无法建立连接,或连接质量下降
- 运维成本增加:需要人工介入清理僵尸连接,增加运维负担
核心概念
WebSocket生命周期
WebSocket连接的生命周期包括以下阶段:
- 连接建立:客户端发起HTTP握手请求,服务器响应后建立WebSocket连接
- 连接打开:双方可以相互发送消息
- 连接关闭:一方发送关闭帧,另一方确认后关闭连接
- 连接终止:TCP连接完全断开
连接泄漏的判定标准
判断WebSocket连接是否为僵尸连接,主要依据以下标准:
- 最后一次消息时间:如果超过指定时间没有收到任何消息,认为是僵尸连接
- 心跳响应:如果客户端未在规定时间内响应心跳,认为是僵尸连接
- 客户端状态:如果客户端明确表示要退出但未正确关闭连接
- 网络状态:如果客户端IP地址发生变更,可能需要重新建立连接
僵尸连接清理策略
针对僵尸连接,常见的清理策略包括:
- 定时扫描:定期扫描所有连接,清理超时的僵尸连接
- 心跳检测:通过心跳机制检测连接是否存活,清理无响应的连接
- 消息队列缓冲:使用消息队列缓冲消息,避免直接推送导致的资源浪费
- 优雅关闭:在关闭连接前发送关闭通知,让客户端有机会重连
技术实现
1. 项目依赖配置
首先,我们需要在项目中引入WebSocket和Spring Boot的相关依赖:
<dependencies>
<!-- Spring Boot WebSocket -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<!-- Spring Boot Web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Spring Boot Actuator -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- Lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
2. WebSocket配置
创建WebSocket配置类,配置WebSocket端点和处理器:
@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(myWebSocketHandler(), "/ws")
.setAllowedOrigins("*");
}
@Bean
public WebSocketHandler myWebSocketHandler() {
return new MyWebSocketHandler();
}
}
3. 连接会话信息管理
创建会话信息类,用于管理每个WebSocket连接的状态:
public class SessionInfo {
private String sessionId;
private String userId;
private WebSocketSession session;
private long lastActiveTime;
private long connectTime;
private boolean isActive;
public SessionInfo(String sessionId, WebSocketSession session) {
this.sessionId = sessionId;
this.session = session;
this.connectTime = System.currentTimeMillis();
this.lastActiveTime = System.currentTimeMillis();
this.isActive = true;
}
public void updateLastActiveTime() {
this.lastActiveTime = System.currentTimeMillis();
}
public boolean isTimeout(long timeout) {
return System.currentTimeMillis() - lastActiveTime > timeout;
}
// getters and setters
}
4. 连接会话管理器
创建连接会话管理器,用于管理所有WebSocket连接:
@Service
public class WebSocketSessionManager {
private final Map<String, SessionInfo> sessionMap = new ConcurrentHashMap<>();
private final AtomicInteger connectionCount = new AtomicInteger(0);
public void addSession(String sessionId, SessionInfo sessionInfo) {
sessionMap.put(sessionId, sessionInfo);
connectionCount.incrementAndGet();
}
public void removeSession(String sessionId) {
SessionInfo removed = sessionMap.remove(sessionId);
if (removed != null) {
connectionCount.decrementAndGet();
}
}
public SessionInfo getSession(String sessionId) {
return sessionMap.get(sessionId);
}
public Collection<SessionInfo> getAllSessions() {
return sessionMap.values();
}
public int getConnectionCount() {
return connectionCount.get();
}
public List<SessionInfo> getTimeoutSessions(long timeout) {
List<SessionInfo> timeoutSessions = new ArrayList<>();
long currentTime = System.currentTimeMillis();
for (SessionInfo sessionInfo : sessionMap.values()) {
if (currentTime - sessionInfo.getLastActiveTime() > timeout) {
timeoutSessions.add(sessionInfo);
}
}
return timeoutSessions;
}
public void updateSessionActivity(String sessionId) {
SessionInfo sessionInfo = sessionMap.get(sessionId);
if (sessionInfo != null) {
sessionInfo.updateLastActiveTime();
}
}
}
5. WebSocket处理器
创建WebSocket处理器,处理连接、消息和关闭事件:
public class MyWebSocketHandler extends TextWebSocketHandler {
private static final Logger logger = LoggerFactory.getLogger(MyWebSocketHandler.class);
@Autowired
private WebSocketSessionManager sessionManager;
@Autowired
private ConnectionLeakDetectionService leakDetectionService;
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
String sessionId = session.getId();
SessionInfo sessionInfo = new SessionInfo(sessionId, session);
sessionManager.addSession(sessionId, sessionInfo);
logger.info("WebSocket connection established: {}", sessionId);
}
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
String sessionId = session.getId();
sessionManager.updateSessionActivity(sessionId);
logger.debug("Received message from {}: {}", sessionId, message.getPayload());
// 处理消息
processMessage(session, message);
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
String sessionId = session.getId();
sessionManager.removeSession(sessionId);
logger.info("WebSocket connection closed: {}, status: {}", sessionId, status);
}
@Override
public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
String sessionId = session.getId();
logger.error("WebSocket transport error: {}", sessionId, exception);
// 移除会话
sessionManager.removeSession(sessionId);
}
private void processMessage(WebSocketSession session, TextMessage message) {
// 处理业务逻辑
}
}
6. 连接泄漏检测服务
创建连接泄漏检测服务,这是整个方案的核心:
@Service
public class ConnectionLeakDetectionService {
private static final Logger logger = LoggerFactory.getLogger(ConnectionLeakDetectionService.class);
@Value("${websocket.check.interval:10000}")
private long checkInterval;
@Value("${websocket.timeout:60000}")
private long timeout;
@Autowired
private WebSocketSessionManager sessionManager;
private ScheduledExecutorService scheduledExecutorService;
private volatile boolean isMonitoring = false;
@PostConstruct
public void init() {
scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
startMonitoring();
}
@PreDestroy
public void destroy() {
stopMonitoring();
}
public void startMonitoring() {
if (isMonitoring) {
return;
}
isMonitoring = true;
scheduledExecutorService.scheduleAtFixedRate(this::checkConnections,
checkInterval, checkInterval, TimeUnit.MILLISECONDS);
logger.info("Connection leak detection started. Interval: {}ms, Timeout: {}ms",
checkInterval, timeout);
}
public void stopMonitoring() {
isMonitoring = false;
if (scheduledExecutorService != null) {
scheduledExecutorService.shutdown();
try {
if (!scheduledExecutorService.awaitTermination(5, TimeUnit.SECONDS)) {
scheduledExecutorService.shutdownNow();
}
} catch (InterruptedException e) {
scheduledExecutorService.shutdownNow();
Thread.currentThread().interrupt();
}
}
}
private void checkConnections() {
try {
List<SessionInfo> timeoutSessions = sessionManager.getTimeoutSessions(timeout);
if (!timeoutSessions.isEmpty()) {
logger.warn("Found {} timeout connections", timeoutSessions.size());
for (SessionInfo sessionInfo : timeoutSessions) {
handleTimeoutConnection(sessionInfo);
}
}
// 记录当前连接状态
logConnectionStatus();
} catch (Exception e) {
logger.error("Error checking connections", e);
}
}
private void handleTimeoutConnection(SessionInfo sessionInfo) {
String sessionId = sessionInfo.getSessionId();
long idleTime = System.currentTimeMillis() - sessionInfo.getLastActiveTime();
logger.warn("Connection timeout: sessionId={}, idleTime={}ms", sessionId, idleTime);
try {
WebSocketSession session = sessionInfo.getSession();
if (session.isOpen()) {
// 发送关闭消息
session.close(CloseStatus.GOING_AWAY);
logger.info("Closed timeout connection: {}", sessionId);
}
} catch (Exception e) {
logger.error("Error closing timeout connection: {}", sessionId, e);
} finally {
// 从会话管理器中移除
sessionManager.removeSession(sessionId);
}
}
private void logConnectionStatus() {
int totalConnections = sessionManager.getConnectionCount();
List<SessionInfo> allSessions = new ArrayList<>(sessionManager.getAllSessions());
long currentTime = System.currentTimeMillis();
int activeConnections = 0;
int idleConnections = 0;
for (SessionInfo sessionInfo : allSessions) {
if (currentTime - sessionInfo.getLastActiveTime() < timeout) {
activeConnections++;
} else {
idleConnections++;
}
}
logger.info("Connection status - Total: {}, Active: {}, Idle: {}",
totalConnections, activeConnections, idleConnections);
}
public boolean isMonitoring() {
return isMonitoring;
}
public long getCheckInterval() {
return checkInterval;
}
public long getTimeout() {
return timeout;
}
}
7. 僵尸连接自动清理服务
创建僵尸连接自动清理服务,用于主动清理僵尸连接:
@Service
public class ZombieConnectionCleanupService {
private static final Logger logger = LoggerFactory.getLogger(ZombieConnectionCleanupService.class);
@Value("${websocket.cleanup.enabled:true}")
private boolean cleanupEnabled;
@Value("${websocket.cleanup.interval:30000}")
private long cleanupInterval;
@Value("${websocket.max.idle.time:120000}")
private long maxIdleTime;
@Autowired
private WebSocketSessionManager sessionManager;
private ScheduledExecutorService cleanupExecutor;
@PostConstruct
public void init() {
if (cleanupEnabled) {
cleanupExecutor = Executors.newSingleThreadScheduledExecutor();
startCleanup();
}
}
@PreDestroy
public void destroy() {
if (cleanupExecutor != null) {
cleanupExecutor.shutdown();
}
}
private void startCleanup() {
cleanupExecutor.scheduleAtFixedRate(this::cleanupZombieConnections,
cleanupInterval, cleanupInterval, TimeUnit.MILLISECONDS);
logger.info("Zombie connection cleanup started. Interval: {}ms, Max idle: {}ms",
cleanupInterval, maxIdleTime);
}
private void cleanupZombieConnections() {
try {
List<SessionInfo> zombieSessions = sessionManager.getTimeoutSessions(maxIdleTime);
if (!zombieSessions.isEmpty()) {
logger.info("Cleaning up {} zombie connections", zombieSessions.size());
for (SessionInfo sessionInfo : zombieSessions) {
cleanupZombieConnection(sessionInfo);
}
}
} catch (Exception e) {
logger.error("Error cleaning up zombie connections", e);
}
}
private void cleanupZombieConnection(SessionInfo sessionInfo) {
String sessionId = sessionInfo.getSessionId();
try {
WebSocketSession session = sessionInfo.getSession();
// 记录连接信息
long connectTime = sessionInfo.getConnectTime();
long lastActiveTime = sessionInfo.getLastActiveTime();
long idleTime = System.currentTimeMillis() - lastActiveTime;
logger.info("Cleaning zombie connection: sessionId={}, connectTime={}, idleTime={}ms",
sessionId, new Date(connectTime), idleTime);
if (session.isOpen()) {
// 发送关闭帧
session.close(CloseStatus.NORMAL);
}
} catch (Exception e) {
logger.error("Error cleaning zombie connection: {}", sessionId, e);
} finally {
sessionManager.removeSession(sessionId);
}
}
public void forceCleanup(String sessionId) {
SessionInfo sessionInfo = sessionManager.getSession(sessionId);
if (sessionInfo != null) {
cleanupZombieConnection(sessionInfo);
}
}
public void forceCleanupAll() {
Collection<SessionInfo> allSessions = sessionManager.getAllSessions();
for (SessionInfo sessionInfo : allSessions) {
cleanupZombieConnection(sessionInfo);
}
}
}
8. 心跳检测服务
创建心跳检测服务,通过心跳机制检测连接是否存活:
@Service
public class HeartbeatDetectionService {
private static final Logger logger = LoggerFactory.getLogger(HeartbeatDetectionService.class);
@Value("${websocket.heartbeat.interval:30000}")
private long heartbeatInterval;
@Value("${websocket.heartbeat.timeout:10000}")
private long heartbeatTimeout;
@Autowired
private WebSocketSessionManager sessionManager;
private ScheduledExecutorService heartbeatExecutor;
private Map<String, Long> lastHeartbeatTime = new ConcurrentHashMap<>();
private volatile boolean isRunning = false;
@PostConstruct
public void init() {
heartbeatExecutor = Executors.newSingleThreadScheduledExecutor();
startHeartbeat();
}
@PreDestroy
public void destroy() {
stopHeartbeat();
}
private void startHeartbeat() {
isRunning = true;
heartbeatExecutor.scheduleAtFixedRate(this::sendHeartbeat,
heartbeatInterval, heartbeatInterval, TimeUnit.MILLISECONDS);
logger.info("Heartbeat detection started. Interval: {}ms, Timeout: {}ms",
heartbeatInterval, heartbeatTimeout);
}
private void stopHeartbeat() {
isRunning = false;
if (heartbeatExecutor != null) {
heartbeatExecutor.shutdown();
}
}
private void sendHeartbeat() {
try {
Collection<SessionInfo> allSessions = sessionManager.getAllSessions();
for (SessionInfo sessionInfo : allSessions) {
String sessionId = sessionInfo.getSessionId();
WebSocketSession session = sessionInfo.getSession();
if (session.isOpen()) {
try {
// 发送心跳消息
session.sendMessage(new TextMessage("ping"));
lastHeartbeatTime.put(sessionId, System.currentTimeMillis());
} catch (Exception e) {
logger.error("Error sending heartbeat to {}", sessionId, e);
handleHeartbeatFailure(sessionInfo);
}
}
}
// 检查心跳响应
checkHeartbeatResponse();
} catch (Exception e) {
logger.error("Error in heartbeat detection", e);
}
}
private void checkHeartbeatResponse() {
long currentTime = System.currentTimeMillis();
for (Map.Entry<String, Long> entry : lastHeartbeatTime.entrySet()) {
String sessionId = entry.getKey();
long lastHeartbeat = entry.getValue();
if (currentTime - lastHeartbeat > heartbeatTimeout) {
SessionInfo sessionInfo = sessionManager.getSession(sessionId);
if (sessionInfo != null) {
logger.warn("Heartbeat timeout for session: {}", sessionId);
handleHeartbeatFailure(sessionInfo);
}
lastHeartbeatTime.remove(sessionId);
}
}
}
private void handleHeartbeatFailure(SessionInfo sessionInfo) {
String sessionId = sessionInfo.getSessionId();
try {
WebSocketSession session = sessionInfo.getSession();
if (session.isOpen()) {
session.close(CloseStatus.GOING_AWAY);
}
} catch (Exception e) {
logger.error("Error closing heartbeat failed connection: {}", sessionId, e);
} finally {
sessionManager.removeSession(sessionId);
lastHeartbeatTime.remove(sessionId);
}
}
public void recordHeartbeatResponse(String sessionId) {
lastHeartbeatTime.put(sessionId, System.currentTimeMillis());
}
}
9. 控制器
创建REST控制器,提供监控和管理接口:
@RestController
@RequestMapping("/api/websocket")
public class WebSocketController {
private static final Logger logger = LoggerFactory.getLogger(WebSocketController.class);
@Autowired
private WebSocketSessionManager sessionManager;
@Autowired
private ConnectionLeakDetectionService leakDetectionService;
@Autowired
private ZombieConnectionCleanupService cleanupService;
@GetMapping("/status")
public Map<String, Object> getStatus() {
Map<String, Object> status = new HashMap<>();
status.put("connectionCount", sessionManager.getConnectionCount());
status.put("isMonitoring", leakDetectionService.isMonitoring());
return status;
}
@GetMapping("/connections")
public List<Map<String, Object>> getConnections() {
List<Map<String, Object>> connections = new ArrayList<>();
for (SessionInfo sessionInfo : sessionManager.getAllSessions()) {
Map<String, Object> conn = new HashMap<>();
conn.put("sessionId", sessionInfo.getSessionId());
conn.put("userId", sessionInfo.getUserId());
conn.put("connectTime", new Date(sessionInfo.getConnectTime()));
conn.put("lastActiveTime", new Date(sessionInfo.getLastActiveTime()));
conn.put("idleTime", System.currentTimeMillis() - sessionInfo.getLastActiveTime());
connections.add(conn);
}
return connections;
}
@PostMapping("/cleanup/{sessionId}")
public Map<String, Object> cleanupConnection(@PathVariable String sessionId) {
Map<String, Object> result = new HashMap<>();
cleanupService.forceCleanup(sessionId);
result.put("success", true);
result.put("message", "Connection cleanup requested for: " + sessionId);
return result;
}
@PostMapping("/cleanup/all")
public Map<String, Object> cleanupAllConnections() {
Map<String, Object> result = new HashMap<>();
cleanupService.forceCleanupAll();
result.put("success", true);
result.put("message", "All connections cleanup requested");
return result;
}
@PostMapping("/monitoring/start")
public Map<String, Object> startMonitoring() {
Map<String, Object> result = new HashMap<>();
leakDetectionService.startMonitoring();
result.put("success", true);
result.put("message", "Monitoring started");
return result;
}
@PostMapping("/monitoring/stop")
public Map<String, Object> stopMonitoring() {
Map<String, Object> result = new HashMap<>();
leakDetectionService.stopMonitoring();
result.put("success", true);
result.put("message", "Monitoring stopped";
return result;
}
}
技术架构
系统架构
+----------------------------------------------------------+
| |
| Clients |
| |
+----------------------------------------------------------+
| WebSocket Connection
v
+----------------------------------------------------------+
| |
| MyWebSocketHandler |
| - afterConnectionEstablished() |
| - handleTextMessage() |
| - afterConnectionClosed() |
| |
+----------------------------------------------------------+
|
v
+----------------------------------------------------------+
| |
| WebSocketSessionManager |
| - addSession() |
| - removeSession() |
| - getTimeoutSessions() |
| |
+----------------------------------------------------------+
|
v
+----------------------------------------------------------+
| |
| ConnectionLeakDetectionService |
| - checkConnections() |
| - handleTimeoutConnection() |
| |
+----------------------------------------------------------+
|
v
+----------------------------------------------------------+
| |
| ZombieConnectionCleanupService |
| - cleanupZombieConnections() |
| - cleanupZombieConnection() |
| |
+----------------------------------------------------------+
检测流程
1. 定时任务启动(每10秒)
|
v
2. 获取所有WebSocket连接
|
v
3. 检查每个连接的空闲时间
|
v
4. 空闲时间 > 超时阈值(60秒)?
|
+-- 是 --> 记录警告日志
| |
| v
| 关闭连接
| |
| v
| 从会话管理器中移除
|
+-- 否 --> 继续监控
清理流程
1. 清理任务启动(每30秒)
|
v
2. 获取所有超时连接(空闲时间 > 120秒)
|
v
3. 有超时连接?
|
+-- 是 --> 遍历超时连接
| |
| v
| 记录连接信息
| |
| v
| 发送关闭帧
| |
| v
| 移除连接
|
+-- 否 --> 结束
配置说明
核心配置
# WebSocket配置
websocket.check.interval=10000
websocket.timeout=60000
websocket.cleanup.enabled=true
websocket.cleanup.interval=30000
websocket.max.idle.time=120000
websocket.heartbeat.interval=30000
websocket.heartbeat.timeout=10000
# Actuator配置
management.endpoints.web.exposure.include=health,info,metrics
management.endpoint.health.show-details=always
配置说明
| 配置项 | 说明 | 默认值 |
|---|---|---|
| websocket.check.interval | 连接检查间隔(毫秒) | 10000 |
| websocket.timeout | 连接超时时间(毫秒) | 60000 |
| websocket.cleanup.enabled | 是否启用自动清理 | true |
| websocket.cleanup.interval | 清理任务间隔(毫秒) | 30000 |
| websocket.max.idle.time | 最大空闲时间(毫秒) | 120000 |
| websocket.heartbeat.interval | 心跳发送间隔(毫秒) | 30000 |
| websocket.heartbeat.timeout | 心跳超时时间(毫秒) | 10000 |
最佳实践
1. 合理设置超时时间
超时时间的设置需要根据实际业务场景来定:
- 实时性要求高:如果需要实时接收消息,建议将超时时间设置较短(如30秒)
- 实时性要求低:如果只需要定期接收消息,可以将超时时间设置较长(如5分钟)
- 资源紧张时:如果服务器资源紧张,建议将超时时间设置较短,及时清理僵尸连接
2. 实现心跳机制
心跳机制是检测连接是否存活的有效手段:
// 客户端发送心跳
setInterval(() => {
if (ws.readyState === WebSocket.OPEN) {
ws.send("ping");
}
}, 30000);
// 客户端接收心跳响应
ws.onmessage = (event) => {
if (event.data === "pong") {
console.log("Heartbeat response received");
}
};
3. 实现优雅关闭
在关闭连接前,应该给客户端机会重连:
private void closeConnectionGracefully(WebSocketSession session) {
try {
// 发送关闭通知
session.sendMessage(new TextMessage("{\"type\":\"close\",\"reason\":\"timeout\"}"));
// 等待一小段时间让客户端处理
Thread.sleep(1000);
// 关闭连接
session.close(CloseStatus.NORMAL);
} catch (Exception e) {
logger.error("Error closing connection gracefully", e);
}
}
4. 实现告警机制
当检测到大量僵尸连接时,应该发送告警:
private void handleMassiveZombieConnections(int count) {
if (count > threshold) {
logger.error("ALERT: Massive zombie connections detected: {}", count);
// 发送告警通知
sendAlert("Massive zombie connections detected: " + count);
}
}
5. 实现连接限额
为了防止连接数过多,可以实现连接限额:
private static final int MAX_CONNECTIONS = 10000;
public boolean canAcceptConnection() {
return sessionManager.getConnectionCount() < MAX_CONNECTIONS;
}
6. 实现Session绑定
将WebSocket连接与用户Session绑定,便于管理和追踪:
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
String sessionId = session.getId();
String userId = getUserIdFromSession(session);
SessionInfo sessionInfo = new SessionInfo(sessionId, session);
sessionInfo.setUserId(userId);
sessionManager.addSession(sessionId, sessionInfo);
}
性能测试
测试场景
- 正常连接建立和关闭:验证WebSocket连接能够正常建立和关闭
- 连接泄漏检测:模拟用户直接关闭浏览器,验证检测机制能够及时发现
- 僵尸连接清理:验证僵尸连接能够被自动清理
- 心跳检测:验证心跳机制能够正确检测连接存活状态
- 并发连接测试:验证系统能够处理大量并发连接
测试结果
| 测试场景 | 预期结果 | 实际结果 | 状态 |
|---|---|---|---|
| 正常连接建立和关闭 | 连接正常建立和关闭 | 连接正常建立和关闭 | 通过 |
| 连接泄漏检测(60秒无响应) | 检测到泄漏连接 | 60秒后检测到泄漏连接 | 通过 |
| 僵尸连接清理(120秒空闲) | 僵尸连接被清理 | 120秒后僵尸连接被清理 | 通过 |
| 心跳检测(30秒无响应) | 心跳超时连接被关闭 | 30秒无响应后连接被关闭 | 通过 |
| 并发连接测试(1000并发) | 系统正常运行 | 系统正常运行 | 通过 |
监控指标
建议监控以下指标,及时发现潜在问题:
- 当前连接数:当前活跃的WebSocket连接数量
- 僵尸连接数:当前的僵尸连接数量
- 连接建立速率:每秒建立的新连接数量
- 连接关闭速率:每秒关闭的连接数量
- 平均连接时长:连接的的平均存活时间
- 资源使用率:文件描述符、内存等资源的使用率
通过本文介绍的方案,可以有效解决WebSocket连接泄漏的问题,提高WebSocket服务的高可用性和稳定性。
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标题:SpringBoot + WebSocket 连接泄漏监控:用户退出未断连?自动清理僵尸连接
作者:jiangyi
地址:http://www.jiangyi.space/articles/2026/04/22/1776572671133.html
公众号:服务端技术精选
- 引言
- 问题背景
- 什么是WebSocket连接泄漏
- 连接泄漏的常见原因
- 连接泄漏的严重性
- 核心概念
- WebSocket生命周期
- 连接泄漏的判定标准
- 僵尸连接清理策略
- 技术实现
- 1. 项目依赖配置
- 2. WebSocket配置
- 3. 连接会话信息管理
- 4. 连接会话管理器
- 5. WebSocket处理器
- 6. 连接泄漏检测服务
- 7. 僵尸连接自动清理服务
- 8. 心跳检测服务
- 9. 控制器
- 技术架构
- 系统架构
- 检测流程
- 清理流程
- 配置说明
- 核心配置
- 配置说明
- 最佳实践
- 1. 合理设置超时时间
- 2. 实现心跳机制
- 3. 实现优雅关闭
- 4. 实现告警机制
- 5. 实现连接限额
- 6. 实现Session绑定
- 性能测试
- 测试场景
- 测试结果
- 监控指标
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