Improve live log viewer — fix level filters, faster updates, add search

- Fix level filter showing nothing: now uses heuristic classification
  for print() output (error/traceback/failed→ERROR, warn→WARNING, etc.)
  in addition to exact logger format matching
- Speed up WebSocket updates from 2s to 0.5s polling
- Add search box with 300ms debounce — filters both initial load and live
- Use DocumentFragment for batch DOM appends (performance)
- Increase line cap from 1000 to 2000
- Backend search parameter support in /api/logs/tail

web_server.py

@@ -6282,21 +6282,38 @@ def get_log_tail():
     }
     log_path = log_map.get(log_source, log_map['app'])
 
+    search = request.args.get('search', '').lower()
+
+    def _classify_log_level(line):
+        """Classify a log line's level. Returns DEBUG/INFO/WARNING/ERROR or empty for unclassified."""
+        if ' - DEBUG - ' in line: return 'DEBUG'
+        if ' - INFO - ' in line: return 'INFO'
+        if ' - WARNING - ' in line: return 'WARNING'
+        if ' - ERROR - ' in line or ' - CRITICAL - ' in line: return 'ERROR'
+        # Heuristic for print() output and non-logger lines
+        ll = line.lower()
+        if 'error' in ll or 'traceback' in ll or 'exception' in ll or 'failed' in ll: return 'ERROR'
+        if 'warning' in ll or 'warn' in ll: return 'WARNING'
+        if 'debug' in ll: return 'DEBUG'
+        return 'INFO'  # Default unclassified lines to INFO
+
     result_lines = []
     if os.path.exists(log_path):
         try:
             with open(log_path, 'r', encoding='utf-8', errors='replace') as f:
                 all_lines = f.readlines()
             # Read more lines than requested so filtering has enough to work with
-            tail = all_lines[-(lines * 3):] if level_filter else all_lines[-lines:]
+            pool_size = lines * 5 if (level_filter or search) else lines
+            tail = all_lines[-pool_size:]
             for line in tail:
                 stripped = line.rstrip()
                 if not stripped:
                     continue
                 if level_filter and level_filter in ('DEBUG', 'INFO', 'WARNING', 'ERROR'):
-                    # Match lines like "2026-04-18 12:00:00 - name - INFO - message"
+                    if _classify_log_level(stripped) != level_filter:
-                    if f' - {level_filter} - ' not in stripped:
                         continue
+                if search and search not in stripped.lower():
+                    continue
                 result_lines.append(stripped)
             # Trim to requested count after filtering
             result_lines = result_lines[-lines:]
@@ -54470,7 +54487,7 @@ def _emit_live_log_loop():
         'source_reuse': os.path.join('logs', 'source_reuse.log'),
     }
     while not globals().get('IS_SHUTTING_DOWN', False):
-        socketio.sleep(2)
+        socketio.sleep(0.5)
         try:
             # Read which source clients want (stored by subscribe handler)
             source = getattr(_emit_live_log_loop, '_source', 'app')

webui/index.html

@@ -5867,6 +5867,7 @@
                                 </div>
                             </div>
                             <div class="log-viewer-actions">
+                                <input type="text" id="log-viewer-search" class="log-viewer-search" placeholder="Search logs..." oninput="_logViewerOnSearch(this)">
                                 <button class="log-action-btn" onclick="_logViewerCopy()" title="Copy visible logs">Copy</button>
                                 <button class="log-action-btn" onclick="_logViewerClear()" title="Clear display">Clear</button>
                                 <label class="log-autoscroll-label">

webui/static/script.js

@@ -6984,7 +6984,26 @@ function _collectGenreWhitelist() {
 let _logViewerActive = false;
 let _logViewerFilter = '';
 let _logViewerSource = 'app';
-const _LOG_MAX_LINES = 1000;
+let _logViewerSearch = '';
+const _LOG_MAX_LINES = 2000;
+
+function _logClassify(line) {
+    // Exact logger format first
+    if (line.includes(' - DEBUG - ')) return 'DEBUG';
+    if (line.includes(' - INFO - ')) return 'INFO';
+    if (line.includes(' - WARNING - ')) return 'WARNING';
+    if (line.includes(' - ERROR - ') || line.includes(' - CRITICAL - ')) return 'ERROR';
+    // Heuristic for print() output
+    const ll = line.toLowerCase();
+    if (ll.includes('error') || ll.includes('traceback') || ll.includes('exception') || ll.includes('failed')) return 'ERROR';
+    if (ll.includes('warning') || ll.includes('warn')) return 'WARNING';
+    if (ll.includes('debug')) return 'DEBUG';
+    return 'INFO';
+}
+
+function _logClassToCSS(level) {
+    return { DEBUG: 'log-debug', INFO: 'log-info', WARNING: 'log-warning', ERROR: 'log-error' }[level] || 'log-plain';
+}
 
 async function _logViewerInit() {
     if (_logViewerActive) return;
@@ -6993,8 +7012,9 @@ async function _logViewerInit() {
 
     // Fetch initial tail
     try {
-        const params = new URLSearchParams({ source: _logViewerSource, lines: 200 });
+        const params = new URLSearchParams({ source: _logViewerSource, lines: 300 });
         if (_logViewerFilter) params.set('level', _logViewerFilter);
+        if (_logViewerSearch) params.set('search', _logViewerSearch);
         const resp = await fetch(`/api/logs/tail?${params}`);
         const data = await resp.json();
         if (data.lines) {
@@ -7027,10 +7047,17 @@ function _logViewerStop() {
 function _logViewerOnLive(data) {
     if (!_logViewerActive || !data.lines) return;
     if (data.source !== _logViewerSource) return;
-    const filtered = _logViewerFilter
+    let lines = data.lines;
-        ? data.lines.filter(l => l.includes(` - ${_logViewerFilter} - `))
+    // Apply level filter client-side for live lines
-        : data.lines;
+    if (_logViewerFilter) {
-    if (filtered.length > 0) _logViewerAppendLines(filtered);
+        lines = lines.filter(l => _logClassify(l) === _logViewerFilter);
+    }
+    // Apply search filter
+    if (_logViewerSearch) {
+        const s = _logViewerSearch.toLowerCase();
+        lines = lines.filter(l => l.toLowerCase().includes(s));
+    }
+    if (lines.length > 0) _logViewerAppendLines(lines);
 }
 
 function _logViewerAppendLines(lines) {
@@ -7039,12 +7066,14 @@ function _logViewerAppendLines(lines) {
     const autoScroll = document.getElementById('log-viewer-autoscroll')?.checked;
     const terminal = document.getElementById('log-viewer-terminal');
 
+    const frag = document.createDocumentFragment();
     for (const line of lines) {
         const div = document.createElement('div');
-        div.className = 'log-line ' + _logViewerGetClass(line);
+        div.className = 'log-line ' + _logClassToCSS(_logClassify(line));
         div.textContent = line;
-        container.appendChild(div);
+        frag.appendChild(div);
     }
+    container.appendChild(frag);
 
     // Trim old lines
     while (container.children.length > _LOG_MAX_LINES) {
@@ -7061,14 +7090,6 @@ function _logViewerAppendLines(lines) {
     }
 }
 
-function _logViewerGetClass(line) {
-    if (line.includes(' - DEBUG - ')) return 'log-debug';
-    if (line.includes(' - INFO - ')) return 'log-info';
-    if (line.includes(' - WARNING - ')) return 'log-warning';
-    if (line.includes(' - ERROR - ') || line.includes(' - CRITICAL - ')) return 'log-error';
-    return 'log-plain';
-}
-
 async function _logViewerChangeSource() {
     _logViewerStop();
     _logViewerSource = document.getElementById('log-viewer-source')?.value || 'app';
@@ -7081,10 +7102,22 @@ function _logViewerFilterLevel(btn) {
     document.querySelectorAll('.log-filter-btn').forEach(b => b.classList.remove('active'));
     btn.classList.add('active');
     _logViewerFilter = btn.dataset.level || '';
-    // Reload with filter
+    _logViewerReload();
+}
+
+let _logSearchDebounce = null;
+function _logViewerOnSearch(input) {
+    clearTimeout(_logSearchDebounce);
+    _logSearchDebounce = setTimeout(() => {
+        _logViewerSearch = (input.value || '').trim();
+        _logViewerReload();
+    }, 300);
+}
+
+function _logViewerReload() {
     _logViewerStop();
     const container = document.getElementById('log-viewer-lines');
-    if (container) container.innerHTML = '';
+    if (container) container.innerHTML = '<div class="log-line log-info">Loading...</div>';
     _logViewerInit();
 }
 

webui/static/style.css

@@ -17282,6 +17282,18 @@ body.helper-mode-active #dashboard-activity-feed:hover {
 
 .log-action-btn:hover { background: rgba(255, 255, 255, 0.08); color: #fff; }
 
+.log-viewer-search {
+    background: rgba(255, 255, 255, 0.06);
+    border: 1px solid rgba(255, 255, 255, 0.12);
+    border-radius: 4px;
+    color: #e0e0e0;
+    padding: 4px 10px;
+    font-size: 12px;
+    width: 160px;
+    outline: none;
+}
+.log-viewer-search:focus { border-color: rgba(255, 255, 255, 0.3); }
+
 .log-autoscroll-label {
     display: flex;
     align-items: center;