def __call__(self, environ, start_response):
etag_match = environ["headers"].get("If-None-Match", default=None)
now = time.time()
expire_time = now + self._expires
headers = [
("Cache-Control", "max-age=%d" % (self._expires)),
("Date", format_date(now)),
("Expires", format_date(expire_time)),
("Last-Modified", format_date(self._last_modified)),
("ETag", self._etag)
]
if self._etag == etag_match:
start_response("304 Not Modified", headers)
return ""
modified = os.stat(self._path).st_mtime
if not self._use_cache or self._cache is None or \
modified > self._last_modified:
self._last_modified = modified
with open(self._path, "r") as fp:
self._cache = fp.read()
self._etag = self._generate_etag()
headers.append(("Content-type", self._mimetype))
start_response("200 OK", headers)
return self._cache
def cache(request, expires=30, public=True):
#set expires header
expiry = (date.today() + timedelta(expires)).timetuple()
request.setHeader("expires" , format_date(mktime(expiry)))
cache_control = "max-age=" + str(60*60*24*expires)
if public:
cache_control += ", public"
else:
cache_control += ", private"
request.setHeader("cache-control", cache_control)
return request
def cache(self, request, expires=30, public=True):
#set expires header
from wsgiref.handlers import format_date_time as format_date
from datetime import date, timedelta
from time import mktime
expiry = (date.today() + timedelta(expires)).timetuple()
request.setHeader("expires" , format_date(mktime(expiry)))
cache_control = "max-age=" + str(60*60*24*expires)
if public:
cache_control += ", public"
else:
cache_control += ", private"
request.setHeader("cache-control", cache_control)
return request
def cache(request, expires=None, public=True):
'''
Sets the cache headers for a (static resource) request
'''
if expires is None:
expires = int(config.tuneback["http_cache_period"])
if expires == 0:
return request
#set expires header
expiry = (date.today() + timedelta(expires)).timetuple()
request.responseHeaders.setRawHeaders("expires",
[format_date(mktime(expiry))])
#set cache control
cache_control = "max-age=" + str(int(60 * 60 * 24 * expires))
if public:
cache_control += ", public"
else:
cache_control += ", private"
request.responseHeaders.setRawHeaders("cache-control", [cache_control])
return request
