Implement differnent config suppliers

dbi.py

@@ -2,7 +2,7 @@ from typing import Dict, List, Union, Tuple, Optional, Any, Final, NamedTuple
 import abc
 from dataclasses import dataclass
 import os
-from collections import namedtuple
+from enum import Enum
 
 import pandas as pd
 
@@ -19,15 +19,32 @@ class DBI(abc.ABC):
         rows: int
         key: Optional[Any]
 
+    class ConfigSupplier(Enum):
+        FILE = 'FILE'
+        DIRECT = 'DIRECT'
+        ENV = 'ENV'
+
     def __init__(self, 
-                 host: str, 
+                 host: Optional[str] = None, 
                  user: Optional[str] = None, 
                  password: Optional[str] = None, 
-                 scheme: Optional[str] = None):
-        self.host: str = os.environ.get(host, 'localhost')
-        self.user: Optional[str] = os.environ.get(user or '', None)
-        self.password: Optional[str] = os.environ.get(password or '', None)
-        self.scheme: Optional[str] = os.environ.get(scheme or '', None)
+                 scheme: Optional[str] = None,
+                 config_supply: ConfigSupplier = ConfigSupplier.ENV):
+        """Initialize a DBI class"""
+        self.OUTPUT(f'Using {config_supply.name} supplied DBI configuration', **self.OUTPUT_KWARGS)
+
+        if config_supply == DBI.ConfigSupplier.ENV:
+            self.host: Optional[str] = os.environ.get(host or '', 'localhost')
+            self.user: Optional[str] = os.environ.get(user or '', None)
+            self.password: Optional[str] = os.environ.get(password or '', None)
+            self.scheme: Optional[str] = os.environ.get(scheme or '', None)
+        elif config_supply == DBI.ConfigSupplier.FILE:
+            raise NotImplementedError()
+        else:
+            self.host = host
+            self.user = user
+            self.password = password
+            self.scheme = scheme
 
         self.OUTPUT(f'Connecting to {self.host} -> {self.scheme if self.scheme else "*"}', 
                     **self.OUTPUT_KWARGS)

mysql.py

@@ -1,10 +1,10 @@
 from typing import Dict, Hashable, Iterable, List, MutableMapping, Union, Tuple, Optional, Any
 
-from dbi import DBI, pd
+from .dbi import DBI, pd
 
 class MySQL(DBI):
     def __init__(self, 
-                 host: str, 
+                 host: Optional[str] = None, 
                  user: Optional[str] = None, 
                  password: Optional[str] = None, 
                  scheme: Optional[str] = None):