calculate midnight on iteration to deal with DST changes

cherry/bedtime/__init__.py

@@ -149,7 +149,6 @@ async def periodic_rule_check(client, chain, timezone, scene, state, mutex):
     """
     Periodically checks for a matching rule to apply.
 
-    nstalling collected packages: cherry-hue
     :param client: mqtt client
     :param chain: the head of a rule chain
     :param timezone: local time zone object
@@ -157,14 +156,14 @@ async def periodic_rule_check(client, chain, timezone, scene, state, mutex):
     :param state: shared state dictionary
     :param mutex: lock for making changes to shared state
     """
-    midnight = timezone.localize(
-        datetime.combine(now(timezone), datetime.min.time()))
-    logging.debug(f'Setting time zone to {midnight.tzname()}')
-
     while True:
         logging.debug('Begin rule check')
         await mutex.acquire()
 
+        midnight = timezone.localize(
+            datetime.combine(now(timezone), datetime.min.time()))
+        logging.debug(f'Setting time zone to {midnight.tzname()}')
+
         if now(timezone) >= midnight:
             for rule in chain.walk():
                 if now(timezone).time() < rule.time:

setup.py

@@ -2,7 +2,7 @@
 from setuptools import setup, find_namespace_packages
 
 setup(name='cherry-bedtime',
-      version='0.2',
+      version='0.3',
       description='Simulates a sunset as bedtime approaches',
       author='Bob Carroll',
       author_email='bob.carroll@alum.rit.edu',