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### CACHE ############################################################################################
# Code for caching XML-queries, HTML, images in subfolders in /cache.
# The filenames are unique MD5-hases.
# Authors: Frederik De Bleser, Tom De Smedt.
# Copyright (c) 2007 Tom De Smedt.
# See LICENSE.txt for details.
import os
import datetime
import sys
from glob import glob
try:
# Python 2.6+
from hashlib import md5
except:
# Python 2.5-
from md5 import new as md5
# For Mac OS X, the cache is stored inside the web library folder.
# For Windows, it is stored in the user's folder (Documents and Settings\UserName\.nodebox-web-cache).
# For Linux, it is stored in $HOME/.nodebox-web-cache/
if sys.platform.startswith("darwin"):
CACHE_PATH = os.path.join(os.path.dirname(__file__), "cache", "")
elif sys.platform.startswith("win"):
CACHE_PATH = os.path.join(os.environ["HOMEPATH"], ".nodebox-web-cache", "")
elif sys.platform.startswith("java"):
from java.lang import System # Running under Jython, e.g. NodeBox 2.
CACHE_PATH = os.path.join(System.getProperty("user.home"), ".nodebox-web-cache", "")
else:
CACHE_PATH = os.path.join(os.environ["HOME"], ".nodebox-web-cache", "")
class Cache:
def __init__(self, name, type=".xml"):
""" The cache can be used to store data downloads.
All of the data is stored in subfolders of the CACHE_PATH.
Each filename is hashed to a unique md5 string.
"""
self.path = os.path.join(CACHE_PATH, name)
self.type = type
if not os.path.exists(self.path):
os.makedirs(self.path)
def hash(self, id):
""" Creates a unique filename in the cache for the id.
"""
h = md5(id).hexdigest()
return os.path.join(self.path, h+self.type)
def write(self, id, data):
# Write files using binary mode to avoid extra newlines being inserted.
f = open(self.hash(id), "wb")
f.write(data)
f.close()
def read(self, id):
path = self.hash(id)
if os.path.exists(path):
f = open(path)
data = f.read()
f.close()
return data
else:
return None
def exists(self, id):
return os.path.exists(self.hash(id))
def age(self, id):
""" Returns the age of the cache entry, in days.
"""
path = self.hash(id)
if os.path.exists(path):
modified = datetime.datetime.fromtimestamp(os.stat(path)[8])
age = datetime.datetime.today() - modified
return age.days
else:
return 0
def remove(self, id):
path = self.hash(id)
if os.path.exists(path):
os.unlink(path)
def clear(self):
for path in glob(os.path.join(self.path,"*")):
os.unlink(path)
#c = Cache("kuler")
#print c.age("http://kuler.adobe.com/kuler/services/theme/getList.cfm?listType=popular")
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