fix: keep model activity alive and switch new chats

static/src/app.ts

@@ -105,6 +105,16 @@ function debugLog(...args) {
     }
     debugLog(...args);
 }
+// 临时排查对话切换问题的调试输出
+const TRACE_CONV = true;
+const traceLog = (...args) => {
+    if (!TRACE_CONV) return;
+    try {
+        console.log('[conv-trace]', ...args);
+    } catch (e) {
+        // ignore
+    }
+};
 
 const appOptions = {
         data() {
@@ -136,6 +146,8 @@ const appOptions = {
                 skipConversationHistoryReload: false,
                 _scrollListenerReady: false,
                 historyLoading: false,
+                historyLoadingFor: null,
+                historyLoadSeq: 0,
                 mobileViewportQuery: null,
                 modeMenuOpen: false,
                 conversationListRequestSeq: 0,
@@ -334,6 +346,14 @@ const appOptions = {
                     immediate: false,
                     handler(newValue, oldValue) {
                         debugLog('currentConversationId 变化', { oldValue, newValue, skipConversationHistoryReload: this.skipConversationHistoryReload });
+                        traceLog('watch:currentConversationId', {
+                            oldValue,
+                            newValue,
+                            skipConversationHistoryReload: this.skipConversationHistoryReload,
+                            historyLoading: this.historyLoading,
+                            historyLoadingFor: this.historyLoadingFor,
+                            historyLoadSeq: this.historyLoadSeq
+                        });
                         this.logMessageState('watch:currentConversationId', { oldValue, newValue, skipConversationHistoryReload: this.skipConversationHistoryReload });
                         if (!newValue || typeof newValue !== 'string' || newValue.startsWith('temp_')) {
                             return;
@@ -1295,12 +1315,15 @@ const appOptions = {
                 this.loadingMoreConversations = false;
             },
             
-            async loadConversation(conversationId) {
+            async loadConversation(conversationId, options = {}) {
+                const force = Boolean(options.force);
                 debugLog('加载对话:', conversationId);
-                this.logMessageState('loadConversation:start', { conversationId });
+                traceLog('loadConversation:start', { conversationId, currentConversationId: this.currentConversationId, force });
+                this.logMessageState('loadConversation:start', { conversationId, force });
                 
-                if (conversationId === this.currentConversationId) {
+                if (!force && conversationId === this.currentConversationId) {
                     debugLog('已是当前对话，跳过加载');
+                    traceLog('loadConversation:skip-same', { conversationId });
                     return;
                 }
                 
@@ -1313,6 +1336,7 @@ const appOptions = {
                     
                     if (result.success) {
                         debugLog('对话加载API成功:', result);
+                        traceLog('loadConversation:api-success', { conversationId, title: result.title });
                         
                         // 2. 更新当前对话信息
                         this.skipConversationHistoryReload = true;
@@ -1331,6 +1355,10 @@ const appOptions = {
                         await this.fetchAndDisplayHistory();
                         this.fetchConversationTokenStatistics();
                         this.updateCurrentContextTokens();
+                        traceLog('loadConversation:after-history', {
+                            conversationId,
+                            messagesLen: Array.isArray(this.messages) ? this.messages.length : 'n/a'
+                        });
                         
                     } else {
                         console.error('对话加载失败:', result.message);
@@ -1342,6 +1370,7 @@ const appOptions = {
                     }
                 } catch (error) {
                     console.error('加载对话异常:', error);
+                    traceLog('loadConversation:error', { conversationId, error: error?.message || String(error) });
                     this.uiPushToast({
                         title: '加载对话异常',
                         message: error.message || String(error),
@@ -1365,23 +1394,28 @@ const appOptions = {
             // 关键功能：获取并显示历史对话内容
             // ==========================================
             async fetchAndDisplayHistory() {
-                if (this.historyLoading) {
+                const targetConversationId = this.currentConversationId;
-                    debugLog('历史消息正在加载，跳过重复请求');
+                if (!targetConversationId || targetConversationId.startsWith('temp_')) {
-                    return;
-                }
-                this.historyLoading = true;
-                try {
-                    debugLog('开始获取历史对话内容...');
-                    this.logMessageState('fetchAndDisplayHistory:start', { conversationId: this.currentConversationId });
-                    
-                    if (!this.currentConversationId || this.currentConversationId.startsWith('temp_')) {
                     debugLog('没有当前对话ID，跳过历史加载');
                     return;
                 }
 
+                // 若同一对话正在加载，直接复用；若是切换对话则允许并发但后来的请求会赢
+                if (this.historyLoading && this.historyLoadingFor === targetConversationId) {
+                    debugLog('同一对话历史正在加载，跳过重复请求');
+                    return;
+                }
+
+                const loadSeq = ++this.historyLoadSeq;
+                this.historyLoading = true;
+                this.historyLoadingFor = targetConversationId;
+                try {
+                    debugLog('开始获取历史对话内容...');
+                    this.logMessageState('fetchAndDisplayHistory:start', { conversationId: this.currentConversationId });
+                    
                     try {
                         // 使用专门的API获取对话消息历史
-                        const messagesResponse = await fetch(`/api/conversations/${this.currentConversationId}/messages`);
+                        const messagesResponse = await fetch(`/api/conversations/${targetConversationId}/messages`);
                         
                         if (!messagesResponse.ok) {
                             console.warn('无法获取消息历史，尝试备用方法');
@@ -1401,6 +1435,12 @@ const appOptions = {
                             return;
                         }
                         
+                        // 如果在等待期间用户已切换到其他对话，则丢弃结果
+                        if (loadSeq !== this.historyLoadSeq || this.currentConversationId !== targetConversationId) {
+                            debugLog('检测到对话已切换，丢弃过期的历史加载结果');
+                            return;
+                        }
+                        
                         const messagesData = await messagesResponse.json();
                         debugLog('获取到消息数据:', messagesData);
                         
@@ -1445,7 +1485,11 @@ const appOptions = {
                         this.logMessageState('fetchAndDisplayHistory:error-cleared');
                     }
                 } finally {
+                    // 仅在本次加载仍是最新请求时清除 loading 状态
+                    if (loadSeq === this.historyLoadSeq) {
                         this.historyLoading = false;
+                        this.historyLoadingFor = null;
+                    }
                 }
             },
             
@@ -1692,6 +1736,10 @@ const appOptions = {
             
             async createNewConversation() {
                 debugLog('创建新对话...');
+                traceLog('createNewConversation:start', {
+                    currentConversationId: this.currentConversationId,
+                    convCount: Array.isArray(this.conversations) ? this.conversations.length : 'n/a'
+                });
                 this.logMessageState('createNewConversation:start');
                 
                 try {
@@ -1711,6 +1759,7 @@ const appOptions = {
                     if (result.success) {
                         const newConversationId = result.conversation_id;
                         debugLog('新对话创建成功:', newConversationId);
+                        traceLog('createNewConversation:created', { newConversationId });
                         
                         // 在本地列表插入占位，避免等待刷新
                         const placeholder = {
@@ -1726,11 +1775,20 @@ const appOptions = {
                         ];
                         
                         // 直接加载新对话，确保状态一致
-                        await this.loadConversation(newConversationId);
+                        // 如果 socket 事件已把 currentConversationId 设置为新ID，则强制加载一次以同步状态
+                        await this.loadConversation(newConversationId, { force: true });
+                        traceLog('createNewConversation:after-load', {
+                            newConversationId,
+                            currentConversationId: this.currentConversationId
+                        });
 
                         // 刷新对话列表获取最新统计
                         this.conversationsOffset = 0;
                         await this.loadConversationsList();
+                        traceLog('createNewConversation:after-refresh', {
+                            newConversationId,
+                            conversationsLen: Array.isArray(this.conversations) ? this.conversations.length : 'n/a'
+                        });
                     } else {
                         console.error('创建对话失败:', result.message);
                         this.uiPushToast({

static/src/composables/useLegacySocket.ts

@@ -591,6 +591,7 @@ export async function initializeLegacySocket(ctx: any) {
         // 监听对话变更事件
         ctx.socket.on('conversation_changed', (data) => {
             socketLog('对话已切换:', data);
+            console.log('[conv-trace] socket:conversation_changed', data);
             ctx.currentConversationId = data.conversation_id;
             ctx.currentConversationTitle = data.title || '';
             ctx.promoteConversationToTop(data.conversation_id);
@@ -618,6 +619,7 @@ export async function initializeLegacySocket(ctx: any) {
                 return;
             }
             const convId = data.conversation_id;
+            console.log('[conv-trace] socket:conversation_resolved', data);
             ctx.currentConversationId = convId;
             if (data.title) {
                 ctx.currentConversationTitle = data.title;

web_server.py

@@ -2278,8 +2278,29 @@ def handle_message(data):
         """发送消息到客户端"""
         socketio.emit(event_type, data, room=client_sid)
 
+    # 模型活动事件：用于刷新“在线”心跳（回复/工具调用都算活动）
+    activity_events = {
+        'ai_message_start', 'thinking_start', 'thinking_chunk', 'thinking_end',
+        'text_start', 'text_chunk', 'text_end',
+        'tool_hint', 'tool_preparing', 'tool_start', 'update_action',
+        'append_payload', 'modify_payload', 'system_message',
+        'task_complete'
+    }
+    last_model_activity = 0.0
+
+    def send_with_activity(event_type, data):
+        """模型产生输出或调用工具时刷新活跃时间，防止长回复被误判下线。"""
+        nonlocal last_model_activity
+        if event_type in activity_events:
+            now = time.time()
+            # 轻量节流：1 秒内多次事件只记一次
+            if now - last_model_activity >= 1.0:
+                record_user_activity(username)
+                last_model_activity = now
+        send_to_client(event_type, data)
+
     # 传递客户端ID
-    socketio.start_background_task(process_message_task, terminal, message, send_to_client, client_sid)
+    socketio.start_background_task(process_message_task, terminal, message, send_with_activity, client_sid)
 
 
 @socketio.on('client_chunk_log')