fix: Validate TASK_POLLING_INTERVAL env var

Signed-off-by: Marcel Klehr <mklehr@gmx.net>

Author: marcelklehr

lib/main.py

@@ -39,7 +39,16 @@ def log(nc, level, content):
 }
 app_enabled = Event()
 trigger = Event()
-CHECK_INTERVAL = float(os.getenv('TASK_POLLING_INTERVAL', '5'))
+
+try:
+    CHECK_INTERVAL = float(os.getenv('TASK_POLLING_INTERVAL', '5'))
+    if CHECK_INTERVAL <= 0:
+        logger.warning("Invalid TASK_POLLING_INTERVAL env variable, falling back to default 5 seconds")
+        CHECK_INTERVAL = 5
+except (TypeError, ValueError):
+    logger.warning("Invalid TASK_POLLING_INTERVAL env variable, falling back to default 5 seconds")
+    CHECK_INTERVAL = 5
+
 CHECK_INTERVAL_WITH_TRIGGER = 5 * 60
 CHECK_INTERVAL_ON_ERROR = 10
 SHUTDOWN_EVENT_RECEIVED = Event()