Logs via logging library

src/technitium-ddns.py

@@ -40,6 +40,9 @@ import dns.tsigkeyring
 import dns.exception
 
 # Configuration loading
+LOG_LEVEL = os.environ.get("LOG_LEVEL", "ERROR").upper()
+LOG_FILE = os.environ.get("LOG_FILE", None)
+
 BACKEND = os.environ.get("BACKEND", "HTTP_API").upper()
 RUN_ONCE = os.environ.get("RUN_ONCE", "0") == "1"
 UPDATE_INTERVAL = int(os.environ.get("UPDATE_INTERVAL", "300"))
@@ -204,6 +207,8 @@ def pretty_print(result: Dict[str, Any]):
     logging.info(pformat(result))
 
 def main():
+    logging.basicConfig(level=LOG_LEVEL)
+
     logging.info(f"Starting updater for {FULL_DOMAIN} (zone {ZONE}) backend={BACKEND}")
     if BACKEND not in ("HTTP_API", "RFC2136"):
         logging.error("BACKEND must be HTTP_API or RFC2136", file=sys.stderr)