fix: single log file per startup - singleton handler shared across all modules

utils/logger.py

@@ -16,14 +16,29 @@ LOG_FORMAT = logging.Formatter(
 
 MAX_LOG_FILES = 20
 
+_root_handler: RotatingFileHandler | None = None
+_console_handler: logging.StreamHandler | None = None
+
+
+def _init_handlers():
+    global _root_handler, _console_handler
+    if _root_handler:
+        return
 
-def _new_log_path() -> Path:
     ts = datetime.now().strftime("%Y%m%d_%H%M%S")
     uid = uuid.uuid4().hex[:6]
-    return LOG_DIR / f"turbosu_{ts}_{uid}.log"
+    log_file = LOG_DIR / f"turbosu_{ts}_{uid}.log"
 
+    _root_handler = RotatingFileHandler(
+        log_file, maxBytes=10 * 1024 * 1024, backupCount=20, encoding="utf-8"
+    )
+    _root_handler.setLevel(logging.DEBUG)
+    _root_handler.setFormatter(LOG_FORMAT)
+
+    _console_handler = logging.StreamHandler(sys.stdout)
+    _console_handler.setLevel(logging.INFO)
+    _console_handler.setFormatter(LOG_FORMAT)
 
-def _cleanup_old_logs():
     logs = sorted(LOG_DIR.glob("turbosu_*.log*"), key=lambda p: p.stat().st_mtime)
     while len(logs) > MAX_LOG_FILES:
         oldest = logs.pop(0)
@@ -34,25 +49,15 @@ def _cleanup_old_logs():
 
 
 def setup_logger(name: str, level: int = logging.DEBUG) -> logging.Logger:
+    _init_handlers()
+
     logger = logging.getLogger(name)
     logger.setLevel(level)
     logger.propagate = False
 
     if not logger.handlers:
-        log_file = _new_log_path()
-        fh = RotatingFileHandler(
-            log_file, maxBytes=10 * 1024 * 1024, backupCount=20, encoding="utf-8"
-        )
-        fh.setLevel(logging.DEBUG)
-        fh.setFormatter(LOG_FORMAT)
-        logger.addHandler(fh)
-
-        ch = logging.StreamHandler(sys.stdout)
-        ch.setLevel(logging.INFO)
-        ch.setFormatter(LOG_FORMAT)
-        logger.addHandler(ch)
-
-        _cleanup_old_logs()
+        logger.addHandler(_root_handler)
+        logger.addHandler(_console_handler)
 
     return logger