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import time
try:
import cPickle as pickle
except ImportError:
import pickle
class SimpleCache:
"""A SimpleCache for testing. Copied from Werkzeug."""
def __init__(self, threshold=500, default_timeout=300):
self.default_timeout = default_timeout
self._cache = {}
self.clear = self._cache.clear
self._threshold = threshold
def _prune(self):
if len(self._cache) > self._threshold:
now = time.time()
toremove = []
for idx, (key, (expires, _)) in enumerate(self._cache.items()):
if (expires != 0 and expires <= now) or idx % 3 == 0:
toremove.append(key)
for key in toremove:
self._cache.pop(key, None)
def _normalize_timeout(self, timeout):
if timeout is None:
timeout = self.default_timeout
if timeout > 0:
timeout = time.time() + timeout
return timeout
def get(self, key):
try:
expires, value = self._cache[key]
if expires == 0 or expires > time.time():
return pickle.loads(value)
except (KeyError, pickle.PickleError):
return None
def set(self, key, value, timeout=None):
expires = self._normalize_timeout(timeout)
self._prune()
self._cache[key] = (expires, pickle.dumps(value, pickle.HIGHEST_PROTOCOL))
return True
def delete(self, key):
return self._cache.pop(key, None) is not None
def has(self, key):
try:
expires, value = self._cache[key]
return expires == 0 or expires > time.time()
except KeyError:
return False
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