caching meals for 15 minutes

HSMensaW_botA.py

@@ -10,6 +10,7 @@ import traceback
 import urllib.request
 import xml.etree.ElementTree as ET
 from enum import Enum
+from time import time
 from typing import Any
 from urllib.error import HTTPError
 
@@ -54,6 +55,7 @@ essen = []
 essen_eng = []
 var = True
 datum = None
+last_updated = 0.0
 
 botID = -1
 
@@ -244,7 +246,11 @@ async def get_essen(only_today: bool) -> None:
     :param only_today: only current day; no download if the mensa is closed
     :return:
     """
-    global datum, essen, essen_eng, var  # , ctx
+    global datum, essen, essen_eng, var, last_updated  # , ctx
+    if time() < last_updated + 900:
+        return
+    last_updated = time()
+
     essen = []
     essen_eng = []
     try: