Use internally env.getenv to ensure env.setup is called on the first hit

dmf/alerts/alerts.py

@@ -1,7 +1,8 @@
 from typing import Optional, TYPE_CHECKING, Tuple, Union
-import os
+
 
 from ..utils.typing import Literal
+from ..env import env
 
 if TYPE_CHECKING:
     from .backend import AlertBackend
@@ -155,7 +156,7 @@ def resolve_credentials(
     :param alert_token: Optional; Slack token to override the environment variable.
     :return: A tuple containing the alert_token and the backend type ('slack').
     """
-    alert_token = alert_token or os.getenv(ALERT_TOKEN)
+    alert_token = alert_token or env.getenv(ALERT_TOKEN)
 
     if not alert_token:
         raise ValueError(

dmf/alerts/slack_backend.py

@@ -1,5 +1,5 @@
 import logging
-import os
+
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Optional, Union
@@ -14,6 +14,7 @@
     )
 
 from .backend import AlertBackend, AlertException
+from ..env import env
 
 __all__ = ["SlackBackend"]
 
@@ -74,7 +75,7 @@ def __init__(
 
         super().__init__(fail_silently=fail_silently)
         self.client = WebClient(token=token)
-        self.channel = channel or os.getenv(DEFAULT_CHANNEL_ENV)
+        self.channel = channel or env.getenv(DEFAULT_CHANNEL_ENV)
 
     def send_message(
         self,

dmf/alerts/telegram_backend.py

@@ -1,10 +1,10 @@
 import logging
-import os
 from datetime import datetime
 from pathlib import Path
 from typing import Optional, Union
 
 from ..utils.typing import Literal
+from ..env import env
 
 try:
     import requests
@@ -83,7 +83,7 @@ def __init__(
         """
         super().__init__(fail_silently=fail_silently)
         self.token = token
-        self.channel = channel or os.getenv(DEFAULT_CHANNEL_ENV)
+        self.channel = channel or env.getenv(DEFAULT_CHANNEL_ENV)
 
         if not self.channel:
             raise AlertException(