def send_update(self, update):
response = Response(
response=update['body'],
content_type=update['content_type'],
)
response.last_modified = update['published_on']
response.headers['If-Modified-Since'] = update['published_on']
return response
def handle (self, request):
"""
Handle request for an image
"""
name, path, type = self.lookup(request.path)
# determine handler
if not type:
return self.handle_dir(request, name, path)
elif not request.args:
return self.handle_image(request, name, path)
elif 'w' in request.args and 'h' in request.args and 'x' in request.args and 'y' in request.args:
render_func = self.render_region
elif 'x' in request.args and 'y' in request.args:
render_func = self.render_tile
else:
raise exceptions.BadRequest("Unknown args")
# handle image
image, name = self.open(request.path)
# http caching
mtime = image.cache_mtime()
if 't' in request.args:
try:
ttime = datetime.datetime.utcfromtimestamp(int(request.args['t']))
except ValueError:
ttime = None
else:
ttime = None
if request.if_modified_since and mtime == request.if_modified_since:
response = Response(status=304)
else:
# render
png = render_func(request, image)
response = Response(png, content_type='image/png')
# cache out
response.last_modified = mtime
if not ttime:
# cached item may change while url stays the same
response.headers['Cache-Control'] = 'max-age={min_age:d}'.format(min_age=self.MIN_AGE)
elif ttime == mtime:
# url will change if content changes
response.headers['Cache-Control'] = 'max-age={max_age:d}'.format(max_age=self.MAX_AGE)
else:
# XXX: mismatch wtf
response.headers['Cache-Control'] = 'must-revalidate'
return response
