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124 lines
4.2 KiB
124 lines
4.2 KiB
#!/usr/bin/env python |
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# -*- coding: utf-8 -*- |
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# Mitter, a micro-blogging client with multiple interfaces. |
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# Copyright (C) 2007-2010 Mitter Contributors |
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# |
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# This program is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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import logging |
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import urllib2 |
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import gtk |
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# ---------------------------------------------------------------------- |
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# Constants |
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# ---------------------------------------------------------------------- |
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_log = logging.getLogger('ui.helpers.avatarcache') |
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# ---------------------------------------------------------------------- |
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# The cache class |
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# ---------------------------------------------------------------------- |
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class AvatarCache(object): |
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"""An avatar cache, storing GDK pixbufs references.""" |
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def __init__(self, connection, default, timeout=None): |
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"""Initialization of the cache. |
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connection: |
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A :class:`ThreadManager`, which will be used as thread pool to |
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request the avatars. |
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default: |
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A gdk_pixbuf to be used as placeholder while the real avatar is |
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being downloaded. |
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timeout: |
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Request timeout when downloading the avatars.""" |
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self._connection = connection |
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self._default = default |
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self._cache = {} |
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self._timeout = timeout |
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def get(self, owner, avatar, url=None): |
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"""Return the avatar from the cache or, if the avatar isn't available |
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yet, returns the default avatar and queue the download of it. |
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owner: |
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The object requesting the avatar. Must have a "queue_draw()" |
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method, which will be called once the avatar is available. Can be |
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None. |
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avatar: |
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The identification of the avatar. Can be any string. |
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url: |
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URL to download the avatar. If not passed, *avatar* **must** be a |
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valid URL.""" |
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if avatar in self._cache: |
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return self._cache[avatar] |
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if not url: |
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url = avatar |
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self._connection.add_work(self._post_avatar_download, |
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self._exception_avatar_download, |
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self._download_pic, |
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avatar, |
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url, |
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owner) |
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# add the default avatar in the cache just to avoid a new request for |
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# it. It will be overwritten anyway later. |
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self._cache[avatar] = self._default |
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return self._default |
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# ------------------------------------------------------------ |
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# Network functions |
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# ------------------------------------------------------------ |
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def _download_pic(self, avatar, url, owner): |
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"""Download a picture from the web. Can be used in a thread.""" |
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request = urllib2.Request(url=url) |
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timeout = self._timeout |
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_log.debug('Starting request of %s (timeout %ds)' % ( |
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url, timeout)) |
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response = urllib2.urlopen(request, timeout=timeout) |
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data = response.read() |
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_log.debug('Request completed') |
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return (avatar, owner, data) |
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def _post_avatar_download(self, widget, data): |
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"""Called after the data from the picture is available.""" |
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(avatar, owner, data) = data |
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loader = gtk.gdk.PixbufLoader() |
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loader.write(data) |
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loader.close() |
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user_pic = loader.get_pixbuf() |
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user_pic = user_pic.scale_simple(48, 48, gtk.gdk.INTERP_BILINEAR) |
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self._cache[avatar] = user_pic |
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if owner: |
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owner.queue_draw() |
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return |
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def _exception_avatar_download(self, widget, exception): |
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"""Called in case we have a problem downloading an user avatar.""" |
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_log.debug('Exception trying to get an avatar.') |
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_log.debug(str(exception)) |
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return
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