Issue 402 - Use a redirector script for downloads, not a direct link

sitescripts/extensions/web/downloads.py

 # coding: utf-8
 
 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-2014 Eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
 
 import re
 import time
 import posixpath
 import urlparse
-import multiprocessing
+import threading
+import traceback
 from ConfigParser import SafeConfigParser
 from sitescripts.web import url_handler
 from sitescripts.extensions.utils import getDownloadLinks
 
 links = {}
+UPDATE_INTERVAL = 10 * 60   # 10 minutes
 
 @url_handler('/latest/')
 def handle_request(environ, start_response):
-  update_links()
-
   request = urlparse.urlparse(environ.get('REQUEST_URI', ''))
   basename = posixpath.splitext(posixpath.basename(request.path))[0]
   if basename in links:
     start_response('302 Found', [('Location', links[basename].encode("utf-8"))])
   else:
     start_response('404 Not Found', [])
   return []
 
-UPDATE_INTERVAL = 10 * 60   # 10 minutes
-update_queue = multiprocessing.Queue()
-last_update = -float('Inf')
-
-def update_links():
-  global links, last_update
-  while not update_queue.empty():
-    links = update_queue.get()
-
-  now = time.time()
-  if now - last_update > UPDATE_INTERVAL:
-    last_update = now
-
-    process = multiprocessing.Process(target=_update_links, args=(update_queue,))
-    process.daemon = True
-    process.start()
-
-def _update_links(queue):
+def _get_links():
   parser = SafeConfigParser()
   getDownloadLinks(parser)
   result = {}
   for section in parser.sections():
     result[section] = parser.get(section, "downloadURL")
-  queue.put(result)
+  return result
 
-update_links()
+def _update_links():
+  global links
+
+  while True:
+    try:
+      links = _get_links()
+    except:
+      traceback.print_exc()
+    time.sleep(UPDATE_INTERVAL)
+
+t = threading.Thread(target = _update_links)
+t.daemon = True
+t.start()