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add ETag to tile renderer view

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This commit is contained in:
Laura Klünder 2017-10-20 16:21:25 +02:00
parent 5ede164761
commit decb01c9c7
1 changed files with 13 additions and 2 deletions
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15
src/c3nav/mapdata/views.py
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@ -1,7 +1,7 @@
from django.http import Http404, HttpResponse
from django.http import Http404, HttpResponse, HttpResponseNotModified
from shapely.geometry import box
from c3nav.mapdata.models import Level, Source
from c3nav.mapdata.models import Level, MapUpdate, Source
from c3nav.mapdata.render.svg import SVGRenderer
@ -24,6 +24,14 @@ def tile(request, level, zoom, x, y, format):
renderer = SVGRenderer(level, miny, minx, maxy, maxx, scale=2**zoom, user=request.user)
update_cache_key = MapUpdate.cache_key()
access_cache_key = renderer.access_cache_key
etag = update_cache_key+'_'+access_cache_key
if_none_match = request.META.get('HTTP_IF_NONE_MATCH')
if if_none_match == etag:
return HttpResponseNotModified()
try:
renderer.check_level()
except Level.DoesNotExist:
@ -39,4 +47,7 @@ def tile(request, level, zoom, x, y, format):
else:
raise ValueError
response['ETag'] = etag
response['Cache-Control'] = 'no-cache'
return response