Better restructure, and improved debug

src/node_deployer/utils.py

@@ -0,0 +1,22 @@
+from functools import wraps
+from pathlib import Path
+from typing import Callable
+
+from . import config
+
+
+def ensure_build_dir(f: Callable) -> Callable:
+    @wraps(f)
+    def wrapper(*args, **kwargs):
+        Path(config.BUILD_DIR).mkdir(exist_ok=True, parents=True)
+        return f(*args, **kwargs)
+
+    return wrapper
+
+
+class Singleton(type):
+    _instance = None
+    def __call__(cls, *args, **kwargs):
+        if cls._instance is None:
+            cls._instance = super().__call__(*args, **kwargs)
+        return cls._instance