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authorDan McGee <dan@archlinux.org>2010-10-07 19:57:31 -0500
committerDan McGee <dan@archlinux.org>2010-10-07 19:57:31 -0500
commitf8c2a155102f07fb15be3d181cedb65623ee1dd4 (patch)
treed5e8a101ebb39639d57daf94e107fc4fef8ac55a
parentfc6e7113c40ec33c57164efbddceee80c934f476 (diff)
Ensure last modified times use UTC
We were cheating before and using non-UTC times; adjust the values we get back from the database as appropriate so our times are not bogus. Signed-off-by: Dan McGee <dan@archlinux.org>
-rw-r--r--feeds.py16
1 files changed, 16 insertions, 0 deletions
diff --git a/feeds.py b/feeds.py
index 58c48c38..3fa199d6 100644
--- a/feeds.py
+++ b/feeds.py
@@ -1,4 +1,5 @@
import datetime
+from decimal import Decimal, ROUND_HALF_DOWN
from django.contrib.syndication.views import Feed
from django.core.cache import cache
@@ -14,6 +15,17 @@ CACHE_TIMEOUT = 1800
CACHE_PACKAGE_KEY = 'cache_package_latest'
CACHE_NEWS_KEY = 'cache_news_latest'
+def utc_offset():
+ '''Calculate the UTC offset from local time. Useful for converting values
+ stored in local time to things like cache last modifed headers.'''
+ timediff = datetime.datetime.utcnow() - datetime.datetime.now()
+ secs = timediff.days * 86400 + timediff.seconds
+ # round to nearest minute
+ mins = Decimal(secs) / Decimal(60)
+ mins = mins.quantize(Decimal('0'), rounding=ROUND_HALF_DOWN)
+ return datetime.timedelta(minutes=int(mins))
+
+
def retrieve_package_latest():
# we could break this down based on the request url, but it would probably
# cost us more in query time to do so.
@@ -23,6 +35,7 @@ def retrieve_package_latest():
try:
latest = Package.objects.values('last_update').latest(
'last_update')['last_update']
+ latest = latest + utc_offset()
cache.set(CACHE_PACKAGE_KEY, latest, CACHE_TIMEOUT)
return latest
except Package.DoesNotExist:
@@ -35,6 +48,7 @@ def refresh_package_latest(**kwargs):
# thread. Update it instead.
latest = Package.objects.values('last_update').latest(
'last_update')['last_update']
+ latest = latest + utc_offset()
cache.set(CACHE_PACKAGE_KEY, latest, CACHE_TIMEOUT)
def package_etag(request, *args, **kwargs):
@@ -108,6 +122,7 @@ def retrieve_news_latest():
try:
latest = News.objects.values('last_modified').latest(
'last_modified')['last_modified']
+ latest = latest + utc_offset()
cache.set(CACHE_NEWS_KEY, latest, CACHE_TIMEOUT)
return latest
except News.DoesNotExist:
@@ -120,6 +135,7 @@ def refresh_news_latest(**kwargs):
# thread. Update it instead.
latest = News.objects.values('last_modified').latest(
'last_modified')['last_modified']
+ latest = latest + utc_offset()
cache.set(CACHE_NEWS_KEY, latest, CACHE_TIMEOUT)
def news_etag(request, *args, **kwargs):