ical: Cache data

modules/ical.py

@@ -1,4 +1,6 @@
 from datetime import datetime, timedelta, timezone
+import hashlib
+import urllib.error
 import urllib.request
 
 from icalendar import Calendar, Event, vCalAddress, vText
@@ -10,13 +12,27 @@ class IcalModule:
     def __init__(self, config):
         self.cals = config.cals
 
+        self._cached_file = ".ical-%s.cache"
+        self.cache_time = 15
+
     def draw_module(self, config, width, height, line_height=19):
         now = datetime.now(tz=pytz.timezone('Europe/Paris'))
         toofar = now + timedelta(weeks=1)
 
         events = []
         for cal in self.cals:
-            with urllib.request.urlopen(cal) as c:
+            cache_file = self._cached_file % (hashlib.md5(cal.encode()).hexdigest())
+
+            try:
+                with urllib.request.urlopen(cal) as c:
+                    with open(cache_file, 'wb') as fd:
+                        fd.write(c.read())
+            except ConnectionResetError:
+                pass
+            except urllib.error.URLError:
+                pass
+
+            with open(cache_file) as c:
                 ecal = Calendar.from_ical(c.read())
                 for component in ecal.walk():
                     if component.name == "VEVENT":