Fixed the bug caused by the given path not existing in the logging s…

…ystem. (#25)

lazyllm/common/logger.py

@@ -34,6 +34,7 @@ class _Log:
     def __init__(self):
         self._name = lazyllm.config["log_name"]
         self._pid = getpid()
+        self._log_dir_path = check_path(lazyllm.config["log_dir"], exist=False, file=False)
 
         if getenv("LOGURU_AUTOINIT", "true").lower() in ("1", "true") and stderr:
             try:
@@ -101,9 +102,8 @@ def __getattr__(self, attr):
 def add_file_sink():
     name = lazyllm.config["log_name"]
     pid = getpid()
-    log_dir_path = lazyllm.config["log_dir"]
+    log_dir_path = LOG._log_dir_path
     if log_dir_path:
-        log_dir_path = check_path(log_dir_path, exist=False, file=False)
         log_file_mode = lazyllm.config["log_file_mode"]
         if log_file_mode == "merge":
             log_file_name = f"{name}.json.log"