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# Copyright (C) 2006, Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import os, time, md5
from sugar import env
from sugar import util
class BuddyIconCache(object):
"""Caches icons on disk and finds them based on md5 hash."""
def __init__(self):
ppath = env.get_profile_path()
self._cachepath = os.path.join(ppath, "cache", "buddy-icons")
if not os.path.exists(self._cachepath):
os.makedirs(self._cachepath)
self._cache = {}
# Read all cached icons and their sums
for fname in os.listdir(self._cachepath):
m = md5.new()
data = self._get_icon_data(fname)
if len(data) == 0:
continue
m.update(data)
printable_hash = util.printable_hash(m.digest())
self._cache[printable_hash] = fname
del m
def _get_icon_data(self, fname):
fd = open(os.path.join(self._cachepath, fname), "r")
data = fd.read()
fd.close()
del fd
return data
def get_icon(self, printable_hash):
if not isinstance(printable_hash, unicode):
raise RuntimeError("printable_hash must be a unicode string.")
try:
fname = self._cache[printable_hash]
return self._get_icon_data(fname)
except KeyError:
pass
return None
def add_icon(self, icon_data):
if len(icon_data) == 0:
return
m = md5.new()
m.update(icon_data)
printable_hash = util.printable_hash(m.digest())
if self._cache.has_key(printable_hash):
del m
return
# Write the icon to disk and add an entry to our cache for it
m.update(time.asctime())
fname = util.printable_hash(m.digest())
fd = open(os.path.join(self._cachepath, fname), "w")
fd.write(icon_data)
fd.close()
self._cache[printable_hash] = fname
del m
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