lazily connect

provider.py

@@ -0,0 +1,29 @@
+from abc import ABCMeta, abstractmethod
+from typing import Tuple, Dict, Any, Optional, Union, List
+
+
+class Provider(metaclass=ABCMeta):
+    """Abstract provider class
+    """
+    @abstractmethod
+    def __init__(self, *args: Tuple[Any], **kwargs: Dict[Any, Any]):
+        """Abstract initializer for the Provider class with ProviderConfig
+
+        Args:
+            config (ProviderConfig): config for the provider
+        """
+        pass
+
+    @abstractmethod
+    def get(self, key: str, path: str, filter: str,
+            sep: Optional[str]) -> Union[str, int, float, bool, List[Any]]:
+        """Abstract method to get a value from the provider
+        """
+        pass
+
+    @property
+    @abstractmethod
+    def scheme(self) -> str:
+        """Returns scheme of provider
+        """
+        pass