90 lines
2.7 KiB
Python
90 lines
2.7 KiB
Python
import os
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import socket
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import time
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from django.conf import settings
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from django.core.cache import get_cache
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from django.utils.encoding import smart_str
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from django.utils.hashcompat import md5_constructor
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from django.utils.importlib import import_module
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from compressor.utils import get_mod_func
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def get_hexdigest(plaintext, length=None):
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digest = md5_constructor(smart_str(plaintext)).hexdigest()
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if length:
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return digest[:length]
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return digest
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def simple_cachekey(key):
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return 'django_compressor.%s' % smart_str(key)
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def socket_cachekey(key):
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return "django_compressor.%s.%s" % (socket.gethostname(), smart_str(key))
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try:
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mod_name, func_name = get_mod_func(settings.COMPRESS_CACHE_KEY_FUNCTION)
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get_cachekey = getattr(import_module(mod_name), func_name)
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except (AttributeError, ImportError), e:
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raise ImportError("Couldn't import cache key function %s: %s" %
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(settings.COMPRESS_CACHE_KEY_FUNCTION, e))
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def get_mtime_cachekey(filename):
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return get_cachekey("mtime.%s" % get_hexdigest(filename))
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def get_offline_cachekey(source):
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to_hexdigest = [smart_str(getattr(s, 's', s)) for s in source]
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return get_cachekey("offline.%s" % get_hexdigest(to_hexdigest))
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def get_templatetag_cachekey(compressor, mode, kind):
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return get_cachekey(
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"templatetag.%s.%s.%s" % (compressor.cachekey, mode, kind))
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def get_mtime(filename):
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if settings.COMPRESS_MTIME_DELAY:
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key = get_mtime_cachekey(filename)
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mtime = cache.get(key)
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if mtime is None:
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mtime = os.path.getmtime(filename)
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cache.set(key, mtime, settings.COMPRESS_MTIME_DELAY)
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return mtime
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return os.path.getmtime(filename)
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def get_hashed_mtime(filename, length=12):
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try:
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filename = os.path.realpath(filename)
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mtime = str(int(get_mtime(filename)))
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except OSError:
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return None
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return get_hexdigest(mtime, length)
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def cache_get(key):
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packed_val = cache.get(key)
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if packed_val is None:
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return None
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val, refresh_time, refreshed = packed_val
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if (time.time() > refresh_time) and not refreshed:
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# Store the stale value while the cache
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# revalidates for another MINT_DELAY seconds.
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cache_set(key, val, refreshed=True,
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timeout=settings.COMPRESS_MINT_DELAY)
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return None
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return val
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def cache_set(key, val, refreshed=False,
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timeout=settings.COMPRESS_REBUILD_TIMEOUT):
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refresh_time = timeout + time.time()
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real_timeout = timeout + settings.COMPRESS_MINT_DELAY
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packed_val = (val, refresh_time, refreshed)
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return cache.set(key, packed_val, real_timeout)
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cache = get_cache(settings.COMPRESS_CACHE_BACKEND)
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