Refactor config paths and remove deprecated JSON config format

amniotic/config.py

@@ -1,6 +1,5 @@
 from os import getenv
 
-import json
 import logging
 import tempfile
 import yaml
@@ -46,8 +45,12 @@ def __post_init__(self):
         self.logging = self.logging or logging.INFO
 
     @classmethod
-    def from_file(cls):
+    def get_path_config(cls) -> Path:
+        """
+
+        Get path to config file from environment variable, or default location
 
+        """
         path_config = getenv('AMNIOTIC_CONFIG_PATH')
 
         if not path_config:
@@ -56,25 +59,22 @@ def from_file(cls):
 
         path_config = Path(path_config).absolute()
 
+        return path_config
+
+    @classmethod
+    def from_file(cls):
+
+        path_config = cls.get_path_config()
+
         if not path_config.exists():
             msg = f'Config file not found at "{path_config}". Default values will be used.'
             logging.warning(msg)
             config = {}
         else:
             msg = f'Config file found at "{path_config}"'
             logging.info(msg)
-
             config_str = Path(path_config).read_text()
-
-            if path_config.suffix in {'.yml', '.yaml'}:
-                config = yaml.safe_load(config_str)
-            elif path_config.suffix in {'.json'}:
-                config = json.loads(config_str)
-            else:
-                msg = f'Unknown config format "{path_config.suffix}"'
-                raise ValueError(msg)
-
-            logging.warning(msg)
+            config = yaml.safe_load(config_str)
 
         field_names = {field.name for field in fields(Config)}
         for key in field_names: