Update log file handling and error handling in logger.py

src/backend/base/langflow/main.py

@@ -21,14 +21,24 @@ from langflow.utils.logger import configure
 
 
 def get_lifespan(fix_migration=False, socketio_server=None):
+    from langflow.version import __version__
+
     @asynccontextmanager
     async def lifespan(app: FastAPI):
         nest_asyncio.apply()
-        initialize_services(fix_migration=fix_migration, socketio_server=socketio_server)
-        setup_llm_caching()
-        LangfuseInstance.update()
-        create_or_update_starter_projects()
-        yield
+        # Startup message
+        if __version__:
+            rprint(f"[bold green]Starting Langflow v{__version__}...[/bold green]")
+        else:
+            rprint("[bold green]Starting Langflow...[/bold green]")
+        try:
+            initialize_services(fix_migration=fix_migration, socketio_server=socketio_server)
+            setup_llm_caching()
+            LangfuseInstance.update()
+            create_or_update_starter_projects()
+            yield
+        except Exception as exc:
+            logger.error(exc)
         # Shutdown message
         rprint("[bold red]Shutting down Langflow...[/bold red]")
         teardown_services()

src/backend/base/langflow/utils/logger.py

@@ -54,22 +54,24 @@ def configure(log_level: Optional[str] = None, log_file: Optional[Path] = None,
 
     if not log_file:
         cache_dir = Path(user_cache_dir("langflow"))
+        logger.debug(f"Cache directory: {cache_dir}")
         log_file = cache_dir / "langflow.log"
+        logger.debug(f"Log file: {log_file}")
+    try:
+        log_file = Path(log_file)
+        log_file.parent.mkdir(parents=True, exist_ok=True)
 
-    log_file = Path(log_file)
-    log_file.parent.mkdir(parents=True, exist_ok=True)
-
-    logger.add(
-        sink=str(log_file),
-        level=log_level.upper(),
-        format=log_format,
-        rotation="10 MB",  # Log rotation based on file size
-        serialize=True,
-    )
+        logger.add(
+            sink=str(log_file),
+            level=log_level.upper(),
+            format=log_format,
+            rotation="10 MB",  # Log rotation based on file size
+            serialize=True,
+        )
+    except Exception as exc:
+        logger.error(f"Error setting up log file: {exc}")
 
     logger.debug(f"Logger set up with log level: {log_level}")
-    if log_file:
-        logger.debug(f"Log file: {log_file}")
 
     setup_uvicorn_logger()
     setup_gunicorn_logger()