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import os
import md5
import datetime
from glob import glob
CACHE_PATH = os.path.join(os.path.dirname(__file__), "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 = CACHE_PATH+name
self.type = type
if not os.path.exists(self.path):
os.mkdir(self.path)
def hash(self, id):
""" Creates a unique filename in the cache for the id.
"""
h = md5.new(id).hexdigest()
return os.path.join(self.path, h+self.type)
def write(self, id, data):
f = self.hash(id)
open(f, "w").write(data)
def read(self, id):
f = self.hash(id)
if os.path.exists(f):
return open(f).read()
else:
return None
def exists(self, id):
f = self.hash(id)
return os.path.exists(f)
def age(self, id):
""" Returns the age of the cache entry, in days.
"""
f = self.hash(id)
if os.path.exists(f):
modified = datetime.datetime.fromtimestamp(os.stat(f)[8])
age = datetime.datetime.today() - modified
return age.days
else:
return 0
def remove(self, id):
f = self.hash(id)
if os.path.exists(f):
os.unlink(f)
def clear(self):
for f in glob(os.path.join(self.path,"*")):
os.unlink(f)
#c = Cache("kuler")
#print c.age("http://kuler.adobe.com/kuler/services/theme/getList.cfm?listType=popular")
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