Set the cache headers for static resources

iris.conf.example

@@ -376,3 +376,10 @@ http_ajax_request_timeout: 30
 # engine will be closed after this many seconds, including connections
 # that haven't started/completed an HTTP request.
 http_request_timeout: 5
+
+
+# HTTP Cache Period: period in **days** to request the client to store
+# static resources. Sets the Expires and Cache-Control headers
+# Note: recompiling static resources (js/css) will override the previous versions
+# in clients cache
+http_cache_period: 30

qwebirc/engines/staticengine.py

@@ -3,12 +3,7 @@
 import qwebirc.util as util
 import pprint
 from adminengine import AdminEngineAction
-
-# TODO, cache gzip stuff
-cache = {}
-def clear_cache():
-  global cache
-  cache = {}
+from qwebirc.util.caching import cache
 
 def apply_gzip(request):
   accept_encoding = request.getHeader('accept-encoding')
@@ -29,6 +24,7 @@ def __init__(self, *args, **kwargs):
 
   def render(self, request):
     self.hit(request)
+    cache(request)
     request = apply_gzip(request)
     return static.File.render(self, request)
 

qwebirc/util/caching.py

@@ -0,0 +1,26 @@
+from wsgiref.handlers import format_date_time as format_date
+from datetime import date, timedelta
+from time import mktime
+
+import qwebirc.config as config
+
+'''
+   Sets the cache headers for a (static resource) request
+'''
+def cache(request, expires=None, public=True):
+    if expires is None:
+        expires = int(config.tuneback["http_cache_period"])
+
+    #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