[Refactor] 알림 SSE 훅 구조 개선 및 타입 단순화

src/app/providers.tsx

@@ -19,7 +19,7 @@ export const Providers = ({ children, hasRefreshToken }: Props) => {
     <QueryProvider>
       <MSWProvider>
         <AuthProvider hasRefreshToken={hasRefreshToken}>
-          <NotificationProvider hasRefreshToken={hasRefreshToken}>
+          <NotificationProvider>
             <LazyMotionProvider>
               <ToastProvider>
                 <ModalProvider>{children}</ModalProvider>

src/hooks/use-sse/index.ts

@@ -0,0 +1,2 @@
+export { useSSEConnect } from './use-sse-connect';
+export { useSSEEvent } from './use-sse-event';

src/hooks/use-sse/use-sse-connect/index.ts

@@ -0,0 +1,111 @@
+import { useEffect, useRef, useState } from 'react';
+
+import Cookies from 'js-cookie';
+
+import { API } from '@/api';
+import { NotificationItem } from '@/types/service/notification';
+
+export const useSSEConnect = () => {
+  const [data, setData] = useState<NotificationItem | null>(null);
+
+  const eventSourceRef = useRef<EventSource | null>(null);
+  const retryRefreshRef = useRef(false);
+
+  // SSE 연결 진입점
+  const connect = () => {
+    const token = Cookies.get('accessToken');
+    if (!token) {
+      console.log('[DEBUG] SSE - 토큰 없음');
+      return;
+    }
+
+    setupSSEConnection(token);
+  };
+
+  // SSE 연결 해제 함수
+  const disconnect = () => {
+    if (eventSourceRef.current) {
+      console.log('[DEBUG] SSE - 연결 정리');
+      eventSourceRef.current.close();
+      eventSourceRef.current = null;
+    }
+    retryRefreshRef.current = false;
+  };
+
+  // SSE 재연결 시도 함수
+  const reconnect = async () => {
+    retryRefreshRef.current = true;
+    console.log('[DEBUG] SSE - 토큰 갱신 시도');
+
+    try {
+      await API.authService.refresh();
+      const token = Cookies.get('accessToken');
+      if (token) {
+        setupSSEConnection(token);
+      }
+    } catch (error) {
+      console.error('[DEBUG] SSE - 토큰 갱신 실패:', error);
+      disconnect();
+    }
+  };
+
+  // SSE 연결 설정 함수
+  const setupSSEConnection = (token: string) => {
+    // 1. 기존 연결 정리
+    if (eventSourceRef.current) {
+      console.log('[DEBUG] SSE - 기존 연결 정리');
+      eventSourceRef.current.close();
+      eventSourceRef.current = null;
+    }
+
+    // 2. SSE 연결 시도
+    console.log('[DEBUG] SSE - 연결 시도');
+    const es = new EventSource(
+      `${process.env.NEXT_PUBLIC_API_BASE_URL}/api/v1/notifications/subscribe?accessToken=${token}`,
+    );
+
+    eventSourceRef.current = es;
+
+    // 3. SSE 연결 성공 시
+    es.addEventListener('connect', (event) => {
+      console.log('[DEBUG] SSE - 연결 확인:', event.data);
+      retryRefreshRef.current = false;
+    });
+
+    // 4. SSE 이벤트 수신 시
+    es.addEventListener('notification', (event) => {
+      try {
+        const receivedData = JSON.parse(event.data) as NotificationItem;
+        setData(receivedData);
+        console.log('[DEBUG] SSE - 수신 성공:', receivedData);
+      } catch (error) {
+        console.error('[DEBUG] SSE - 데이터 파싱 실패:', error);
+      }
+    });
+
+    // 5. SSE 연결 오류 발생 시
+    es.onerror = async (_error) => {
+      console.log('[DEBUG] SSE - 연결 오류 발생');
+      es.close();
+      reconnect();
+    };
+  };
+
+  useEffect(() => {
+    connect();
+    return () => disconnect();
+  }, []);
+
+  // 알림 수신 후 3초 뒤 data가 null로 변경됨
+  useEffect(() => {
+    if (!data) return;
+
+    const timer = setTimeout(() => {
+      setData(null);
+    }, 3000);
+
+    return () => clearTimeout(timer);
+  }, [data]);
+
+  return { data };
+};

src/hooks/use-sse/use-sse-event/index.ts

@@ -0,0 +1,38 @@
+import { useEffect } from 'react';
+
+import { QueryKey, useQueryClient } from '@tanstack/react-query';
+
+import { groupKeys } from '@/lib/query-key/query-key-group';
+import { notificationKeys } from '@/lib/query-key/query-key-notification';
+import { userKeys } from '@/lib/query-key/query-key-user';
+import { NotificationItem } from '@/types/service/notification';
+
+const SSE_INVALIDATION_MAP: Partial<
+  Record<NotificationItem['type'], (data: NotificationItem) => QueryKey[]>
+> = {
+  FOLLOW: (data) => [userKeys.me(), userKeys.item(data.user.id)],
+  GROUP_CREATE: () => [groupKeys.lists()],
+  GROUP_DELETE: () => [groupKeys.lists()],
+  GROUP_JOIN: (data) => (data.group ? [groupKeys.detail(String(data.group.id))] : []),
+  GROUP_LEAVE: (data) => (data.group ? [groupKeys.detail(String(data.group.id))] : []),
+  GROUP_JOIN_APPROVED: (data) => (data.group ? [groupKeys.detail(String(data.group.id))] : []),
+  GROUP_JOIN_REJECTED: (data) => (data.group ? [groupKeys.detail(String(data.group.id))] : []),
+  GROUP_JOIN_KICKED: (data) => (data.group ? [groupKeys.detail(String(data.group.id))] : []),
+  GROUP_JOIN_REQUEST: (data) =>
+    data.group ? [groupKeys.joinRequests(String(data.group.id), 'PENDING')] : [],
+};
+
+export const useSSEEvent = (data: NotificationItem | null) => {
+  const queryClient = useQueryClient();
+
+  useEffect(() => {
+    if (!data) return;
+    queryClient.invalidateQueries({ queryKey: notificationKeys.unReadCount() });
+    queryClient.invalidateQueries({ queryKey: notificationKeys.list() });
+
+    const getQueryKeys = SSE_INVALIDATION_MAP[data.type];
+    getQueryKeys?.(data).forEach((queryKey) => {
+      queryClient.invalidateQueries({ queryKey });
+    });
+  }, [data]);
+};

src/providers/provider-notification/index.tsx

@@ -1,7 +1,7 @@
-import { createContext, useContext, useEffect } from 'react';
+import { createContext, useContext } from 'react';
 
 import { useGetNotificationUnreadCount } from '@/hooks/use-notification';
-import { useConnectSSE } from '@/hooks/use-notification/use-notification-connect-sse';
+import { useSSEConnect, useSSEEvent } from '@/hooks/use-sse';
 
 interface NotificationContextType {
   unReadCount: number;
@@ -18,20 +18,14 @@ export const useNotification = () => {
 
 interface NotificationProviderProps {
   children: React.ReactNode;
-  hasRefreshToken: boolean;
 }
 
-export const NotificationProvider = ({ children, hasRefreshToken }: NotificationProviderProps) => {
+export const NotificationProvider = ({ children }: NotificationProviderProps) => {
   const { data: unReadCount = 0 } = useGetNotificationUnreadCount();
-  const { receivedNewNotification, connect, disconnect } = useConnectSSE(hasRefreshToken);
-
-  useEffect(() => {
-    connect();
-    return () => {
-      disconnect();
-    };
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, []);
+  const { data: receivedData } = useSSEConnect();
+  useSSEEvent(receivedData);
+
+  const receivedNewNotification = !!receivedData;
 
   return (
     <NotificationContext.Provider value={{ unReadCount, receivedNewNotification }}>

src/types/service/notification.ts

@@ -9,35 +9,22 @@ export type NotificationType =
   | 'GROUP_JOIN_REJECTED'
   | 'GROUP_JOIN_KICKED';
 
-type NotificationTypeWithoutGroup = 'FOLLOW';
-type NotificationTypeWithGroup = Exclude<NotificationType, NotificationTypeWithoutGroup>;
-
-interface BaseNotification {
+export interface NotificationItem {
   id: number;
   message: string;
   readAt: string | null;
   createdAt: string;
+  type: NotificationType;
   user: {
     id: number;
     nickname: string;
   };
-}
-
-interface NotificationWithoutGroup extends BaseNotification {
-  type: NotificationTypeWithoutGroup;
-  group: null;
-}
-
-interface NotificationWithGroup extends BaseNotification {
-  type: NotificationTypeWithGroup;
   group: {
     id: number;
     title: string;
   } | null;
 }
 
-export type NotificationItem = NotificationWithoutGroup | NotificationWithGroup;
-
 export interface NotificationList {
   notifications: NotificationItem[];
   nextCursor: number | null;