93 lines
3.8 KiB
Java
93 lines
3.8 KiB
Java
package com.webgame.webgamebackend.sse;
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import com.webgame.webgamebackend.common.auth.AuthenticationProvider;
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import jakarta.servlet.http.HttpServletResponse;
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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.RequestHeader;
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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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/**
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* SSE 订阅端点
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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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* 心跳由 SseConnectionManager 统一批量管理，此处不再维护 per-connection 定时器。
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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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/** SseEmitter 超时时间（30 分钟），超时后由 SseConnectionManager 的 onTimeout 回调清理 */
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private static final long SSE_TIMEOUT_MS = 30 * 60 * 1000L;
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private final SseConnectionManager connectionManager;
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private final AuthenticationProvider authProvider;
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@GetMapping(value = "/subscribe", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
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public SseEmitter subscribe(
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@RequestHeader(value = "Last-Event-ID", required = false) String lastEventId,
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HttpServletResponse response) throws IOException {
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// SSE 路径已排除在 AuthInterceptor 之外，此处手动校验登录态
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String token = authProvider.getCurrentToken();
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if (token == null || token.isBlank()) {
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log.warn("[SSE] 缺少认证 token");
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return writeAuthError(response, HttpServletResponse.SC_UNAUTHORIZED, "缺少认证信息，请先登录");
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}
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String userId = authProvider.getUserIdByToken(token);
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if (userId == null) {
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log.warn("[SSE] token 无效或已过期");
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return writeAuthError(response, HttpServletResponse.SC_UNAUTHORIZED, "登录已过期，请重新登录");
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}
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// 设置认证上下文，后续 getCurrentUserId() 可用
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authProvider.setContextToken(token, -1);
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SseEmitter emitter = new SseEmitter(SSE_TIMEOUT_MS);
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String connectionId = 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 | IllegalStateException e) {
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log.warn("[SSE] 发送 connected 事件失败, userId={}, connectionId={}",
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userId, connectionId, e);
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connectionManager.remove(userId, connectionId);
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}
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if (lastEventId != null && !lastEventId.isBlank()) {
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log.debug("[SSE] 客户端重连, Last-Event-ID={}, userId={}, connectionId={}",
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lastEventId, userId, connectionId);
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}
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return emitter;
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}
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/**
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* 向 SSE 客户端返回认证错误
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*
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* 直接写入 HttpServletResponse 返回 401 + SSE error 事件，
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* 前端 SseClient.onopen 检测到 response.status === 401 后触发 onUnauthorized，
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* 自动刷新 token 并重连。
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*
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* @return null，通知 Spring MVC 响应已处理完毕，无需 MessageConverter
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*/
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private SseEmitter writeAuthError(HttpServletResponse response, int status, String message) throws IOException {
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response.setStatus(status);
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response.setContentType(MediaType.TEXT_EVENT_STREAM_VALUE);
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response.getWriter().write("event: error\ndata: {\"code\":" + status + ",\"message\":\"" + message + "\"}\n\n");
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response.getWriter().flush();
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return null;
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}
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}
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