speed up voice rendering

lib/render.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python2
 # -*- coding: UTF-8 -*-
 # File: render.py
-# Date: Thu Jan 08 00:22:33 2015 +0800
+# Date: Thu Jan 08 00:53:11 2015 +0800
 # Author: Yuxin Wu <[email protected]>
 
 import os
@@ -192,6 +192,9 @@ class HTMLRender(object):
             talkers = set([talker_id])
         self.prepare_avatar_css(talkers)
 
+        voice_paths = [msg.imgPath for msg in msgs if msg.type == TYPE_SPEAK]
+        self.res.cache_voice_mp3(voice_paths)
+
         logger.info(u"Rendering {} messages of {}({})".format(
             len(msgs), self.parser.contacts[talker_id], talker_id))