refactor: Make config and storage a singleton

Removes the need for a util method to implement a singleton-like
structure.

Author: mitjohnson

src/pyddns/config.py

@@ -13,7 +13,17 @@
 import os
 
 
+from typing import Optional
+
+
 class Config:
+    _instance: Optional["Config"] = None
+
+    def __new__(cls, *args, **kwargs):
+        if cls._instance is None:
+            cls._instance = super(Config, cls).__new__(cls)
+        return cls._instance
+
     """
     A class to manage configuration settings using ConfigParser.
 

src/pyddns/services/cloudflare_service.py

@@ -20,7 +20,8 @@
 )
 from cloudflare.types.dns import RecordResponse
 
-from pyddns.utils import _get_config, _get_storage
+from pyddns.config import Config
+from pyddns.storage import Storage
 from pyddns.client import DDNSClient
 
 
@@ -37,8 +38,8 @@ def __init__(
     ) -> None:
         logging.debug("CloudFlare DNS: Initializing Cloudflare_DDNS client.")
         self.service_name = "Cloudflare"
-        self.config = _get_config()
-        self.storage = _get_storage()
+        self.config = Config()
+        self.storage = Storage()
 
         self.zone_id: str = zone_id or self.config.get(
             self.service_name, "zone_id"

src/pyddns/services/duckdns_service.py

@@ -14,7 +14,8 @@
 
 import requests
 
-from pyddns.utils import _get_config, _get_storage
+from pyddns.config import Config
+from pyddns.storage import Storage
 from pyddns.client import DDNSClient
 
 
@@ -31,8 +32,8 @@ def __init__(self, token: Optional[str] = None):
         self.url = "https://www.duckdns.org/update"
         self.service_name = "Duckdns"
 
-        self.config = _get_config()
-        self.storage = _get_storage()
+        self.config = Config()
+        self.storage = Storage()
         self.token = token or self.config.get(self.service_name, "token")
 
     def _obtain_record(

src/pyddns/cache.py renamed to src/pyddns/storage.py

@@ -13,6 +13,13 @@
 
 
 class Storage:
+    _instance: Optional["Storage"] = None
+
+    def __new__(cls, *args, **kwargs):
+        if cls._instance is None:
+            cls._instance = super(Storage, cls).__new__(cls)
+        return cls._instance
+
     """
     A class to manage SQLite database operations for DDNS services.