80 lines
2.8 KiB
Java
80 lines
2.8 KiB
Java
package com.webgame.webgamebackend.sse;
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import cn.dev33.satoken.stp.StpUtil;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.http.MediaType;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
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import java.io.IOException;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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/**
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* SSE 连接端点
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*
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* 提供 GET /sse/subscribe 端点，建立持久化 SSE 连接。
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* 连接成功后立即发送 connected 事件确认握手，之后每 30 秒发送心跳保活。
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*/
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@Slf4j
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@RestController
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@RequestMapping("/sse")
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@RequiredArgsConstructor
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public class SseController {
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private final SseConnectionManager connectionManager;
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/**
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* 建立 SSE 订阅连接
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*
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* 需要登录鉴权（Sa-Token 自动校验）。
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* EventSource API 不支持自定义请求头，token 通过 URL 查询参数 ?token=xxx 传递。
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*
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* @return SseEmitter 实例（30 分钟超时）
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*/
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@GetMapping(value = "/subscribe", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
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public SseEmitter subscribe() {
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String userId = StpUtil.getLoginIdAsString();
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SseEmitter emitter = new SseEmitter(30 * 60 * 1000L); // 30 分钟超时
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connectionManager.register(userId, emitter);
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// 发送初始连接确认
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try {
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emitter.send(SseEmitter.event()
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.name("connected")
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.data("{\"message\":\"连接成功\"}"));
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} catch (IOException e) {
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log.warn("[SSE] 发送 connected 事件失败, userId={}", userId);
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}
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// 启动心跳定时任务
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ScheduledExecutorService heartbeat = Executors.newSingleThreadScheduledExecutor(
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r -> new Thread(r, "sse-heartbeat-" + userId.substring(0, Math.min(8, userId.length())))
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);
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heartbeat.scheduleAtFixedRate(() -> {
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try {
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emitter.send(SseEmitter.event()
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.name("heartbeat")
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.data(""));
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} catch (IOException e) {
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// 客户端已断开，清理
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connectionManager.remove(userId);
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heartbeat.shutdown();
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}
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}, 30, 30, TimeUnit.SECONDS);
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// 连接关闭时停止心跳
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emitter.onCompletion(heartbeat::shutdown);
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emitter.onTimeout(heartbeat::shutdown);
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emitter.onError(e -> heartbeat.shutdown());
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log.info("[SSE] 新连接建立, userId={}, 当前在线={}", userId, connectionManager.getOnlineCount());
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return emitter;
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}
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}
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