fix(logging): 日志写入改用 output_dir 并避免重复初始化

- 日志目录改为 get_output_dir()/logs/...（兼容 WECHAT_TOOL_DATA_DIR）
- 清理/关闭旧 handlers，避免重复输出和 Windows 文件锁
- get_logger/get_log_file_path 未初始化时自动 setup_logging
- 新增 tests/test_logging_config_data_dir.py

src/wechat_decrypt_tool/api.py

@@ -10,8 +10,13 @@ from starlette.exceptions import HTTPException as StarletteHTTPException
 from starlette.responses import FileResponse
 from starlette.staticfiles import StaticFiles
 
-from . import __version__ as APP_VERSION
 from .logging_config import setup_logging, get_logger
+
+# 初始化日志系统
+setup_logging()
+logger = get_logger(__name__)
+
+from . import __version__ as APP_VERSION
 from .path_fix import PathFixRoute
 from .chat_realtime_autosync import CHAT_REALTIME_AUTOSYNC
 from .routers.chat import router as _chat_router
@@ -30,10 +35,6 @@ from .routers.wrapped import router as _wrapped_router
 from .sns_stage_timing import add_sns_stage_timing_headers
 from .wcdb_realtime import WCDB_REALTIME, shutdown as _wcdb_shutdown
 
-# 初始化日志系统
-setup_logging()
-logger = get_logger(__name__)
-
 app = FastAPI(
     title="微信数据库解密工具",
     description="现代化的微信数据库解密工具，支持微信信息检测和数据库解密功能",

src/wechat_decrypt_tool/logging_config.py

@@ -53,9 +53,9 @@ class WeChatLogger:
         return cls._instance
     
     def __init__(self):
-        if not self._initialized:
-            self.setup_logging()
-            WeChatLogger._initialized = True
+        # Lazy-init in `setup_logging()` / accessors to avoid double-initialization when
+        # callers instantiate the manager and then call `setup_logging()` again.
+        pass
     
     def setup_logging(self, log_level: str = "INFO"):
         """设置日志配置"""
@@ -66,7 +66,9 @@ class WeChatLogger:
 
         # 创建日志目录
         now = datetime.now()
-        log_dir = Path("output/logs") / str(now.year) / f"{now.month:02d}" / f"{now.day:02d}"
+        from .app_paths import get_output_dir
+
+        log_dir = get_output_dir() / "logs" / str(now.year) / f"{now.month:02d}" / f"{now.day:02d}"
         log_dir.mkdir(parents=True, exist_ok=True)
         
         # 设置日志文件名
@@ -77,6 +79,10 @@ class WeChatLogger:
         root_logger = logging.getLogger()
         for handler in root_logger.handlers[:]:
             root_logger.removeHandler(handler)
+            try:
+                handler.close()
+            except Exception:
+                pass
         
         # 配置日志格式
         # 文件格式（无颜色）
@@ -109,22 +115,48 @@ class WeChatLogger:
         
         # 只为uvicorn日志器添加文件处理器，保持其原有的控制台处理器（带颜色）
         uvicorn_logger = logging.getLogger("uvicorn")
+        for handler in uvicorn_logger.handlers[:]:
+            if isinstance(handler, logging.FileHandler):
+                uvicorn_logger.removeHandler(handler)
+                try:
+                    handler.close()
+                except Exception:
+                    pass
         uvicorn_logger.addHandler(file_handler)
         uvicorn_logger.setLevel(level)
 
         # 只为uvicorn.access日志器添加文件处理器
         uvicorn_access_logger = logging.getLogger("uvicorn.access")
+        for handler in uvicorn_access_logger.handlers[:]:
+            if isinstance(handler, logging.FileHandler):
+                uvicorn_access_logger.removeHandler(handler)
+                try:
+                    handler.close()
+                except Exception:
+                    pass
         uvicorn_access_logger.addHandler(file_handler)
         uvicorn_access_logger.setLevel(level)
 
         # 只为uvicorn.error日志器添加文件处理器
         uvicorn_error_logger = logging.getLogger("uvicorn.error")
+        for handler in uvicorn_error_logger.handlers[:]:
+            if isinstance(handler, logging.FileHandler):
+                uvicorn_error_logger.removeHandler(handler)
+                try:
+                    handler.close()
+                except Exception:
+                    pass
         uvicorn_error_logger.addHandler(file_handler)
         uvicorn_error_logger.setLevel(level)
 
         # 配置FastAPI日志器
         fastapi_logger = logging.getLogger("fastapi")
-        fastapi_logger.handlers = []
+        for handler in fastapi_logger.handlers[:]:
+            fastapi_logger.removeHandler(handler)
+            try:
+                handler.close()
+            except Exception:
+                pass
         fastapi_logger.addHandler(file_handler)
         fastapi_logger.addHandler(console_handler)
         fastapi_logger.setLevel(level)
@@ -136,6 +168,8 @@ class WeChatLogger:
         logger.info(f"日志文件: {self.log_file}")
         logger.info(f"日志级别: {logging.getLevelName(level)}")
         logger.info("=" * 60)
+
+        WeChatLogger._initialized = True
         
         return self.log_file
     
@@ -145,6 +179,8 @@ class WeChatLogger:
     
     def get_log_file_path(self) -> Path:
         """获取当前日志文件路径"""
+        if not hasattr(self, "log_file"):
+            self.setup_logging()
         return self.log_file
 
 
@@ -157,10 +193,14 @@ def setup_logging(log_level: str = "INFO") -> Path:
 def get_logger(name: str) -> logging.Logger:
     """获取日志器的便捷函数"""
     logger_manager = WeChatLogger()
+    if not WeChatLogger._initialized:
+        logger_manager.setup_logging()
     return logger_manager.get_logger(name)
 
 
 def get_log_file_path() -> Path:
     """获取当前日志文件路径的便捷函数"""
     logger_manager = WeChatLogger()
+    if not WeChatLogger._initialized:
+        logger_manager.setup_logging()
     return logger_manager.get_log_file_path()

tests/test_logging_config_data_dir.py

@@ -0,0 +1,63 @@
+import os
+import sys
+import unittest
+import importlib
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT / "src"))
+
+
+def _close_logging_handlers() -> None:
+    # Close handlers to avoid Windows temp dir cleanup failures (FileHandler holds a lock).
+    import logging
+
+    for logger_name in ("", "uvicorn", "uvicorn.access", "uvicorn.error", "fastapi"):
+        lg = logging.getLogger(logger_name)
+        for h in lg.handlers[:]:
+            try:
+                h.close()
+            except Exception:
+                pass
+            try:
+                lg.removeHandler(h)
+            except Exception:
+                pass
+
+
+class TestLoggingConfigDataDir(unittest.TestCase):
+    def setUp(self):
+        self._prev_data_dir = os.environ.get("WECHAT_TOOL_DATA_DIR")
+        self._td = TemporaryDirectory()
+        os.environ["WECHAT_TOOL_DATA_DIR"] = self._td.name
+
+        import wechat_decrypt_tool.app_paths as app_paths
+        import wechat_decrypt_tool.logging_config as logging_config
+
+        importlib.reload(app_paths)
+        importlib.reload(logging_config)
+
+        self.logging_config = logging_config
+
+    def tearDown(self):
+        _close_logging_handlers()
+
+        if self._prev_data_dir is None:
+            os.environ.pop("WECHAT_TOOL_DATA_DIR", None)
+        else:
+            os.environ["WECHAT_TOOL_DATA_DIR"] = self._prev_data_dir
+        self._td.cleanup()
+
+    def test_setup_logging_uses_wechat_tool_data_dir(self):
+        log_file = self.logging_config.setup_logging()
+
+        base = Path(self._td.name) / "output" / "logs"
+        self.assertTrue(log_file.is_relative_to(base))
+        self.assertTrue(log_file.exists())
+
+
+if __name__ == "__main__":
+    unittest.main()
+