格式统一

src/gui/core/log_manager.py

@@ -16,6 +16,7 @@
   ProgressUpdate  → {percentage, message}      更新进度条
 """
 
+import html
 from datetime import datetime
 
 from PyQt5.QtCore import QObject
@@ -27,6 +28,8 @@ from PyQt5.QtWidgets import (
 
 from src.gui.core.event_bus import global_event_bus
 
+_MAX_LOG_LINES = 2000  # 日志行数上限，防止长时间运行内存耗尽
+
 
 class LogManager(QObject):
     """日志与进度管理器。
@@ -48,6 +51,15 @@ class LogManager(QObject):
         global_event_bus.subscribe('LogMessage', self._on_log_message)
         global_event_bus.subscribe('ProgressUpdate', self._on_progress_update)
 
+        # ★ 父控件销毁时自动取消订阅，防止回调泄漏
+        if parent is not None:
+            parent.destroyed.connect(self._cleanup)
+
+    def _cleanup(self):
+        """清理 EventBus 订阅。"""
+        global_event_bus.unsubscribe('LogMessage', self._on_log_message)
+        global_event_bus.unsubscribe('ProgressUpdate', self._on_progress_update)
+
     # ═══════════════════════════════════════════════════════════
     # 公开 API
     # ═══════════════════════════════════════════════════════════
@@ -168,13 +180,23 @@ class LogManager(QObject):
         """LogMessage 事件回调：写入日志区。"""
         if self._log_text is None:
             return
+        if not isinstance(data, dict):
+            return
         message = data.get('message', '')
         level = data.get('level', 'info')
         timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        # ★ HTML 转义：防止日志消息中的 < > & 破坏 HTML 渲染
+        safe_message = html.escape(str(message))
         color_map = {'error': 'red', 'warning': 'orange'}
         color = color_map.get(level, 'black')
-        formatted = f'<span style="color: {color};">[{timestamp}] {message}</span>'
+        formatted = f'<span style="color: {color};">[{timestamp}] {safe_message}</span>'
         self._log_text.append(formatted)
+        # ★ 日志行数上限：防止长时间运行内存耗尽
+        if self._log_text.document().blockCount() > _MAX_LOG_LINES + 100:
+            self._log_text.clear()
+            self._log_text.append(
+                f'<span style="color: gray;">[日志已自动清空，达到 {_MAX_LOG_LINES} 行上限]</span>'
+            )
         cursor = self._log_text.textCursor()
         cursor.movePosition(QTextCursor.End)
         self._log_text.setTextCursor(cursor)