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storage.py
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storage.py
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import time
import pickle
import operator
from utils import digest
from itertools import takewhile
from collections import OrderedDict
from abc import abstractmethod, ABC
class IStorage(ABC):
@abstractmethod
def __setitem__(self, key, value):
"""
Set a key to the given value.
"""
@abstractmethod
def __getitem__(self, key):
"""
Get the given key. If item doesn't exist, raises C{KeyError}
"""
@abstractmethod
def get(self, key, default=None):
"""
Get given key. If not found, return default.
"""
@abstractmethod
def iter_older_than(self, seconds_old):
"""
Return the an iterator over (key, value) tuples for items older
than the given secondsOld.
"""
@abstractmethod
def __iter__(self):
"""
Get the iterator for this storage, should yield tuple of (key, value)
"""
class ForgetfulStorage(IStorage):
def __init__(self, ttl=604800):
"""
By default, max age is a week.
"""
self.data = OrderedDict()
self.ttl = ttl
def __setitem__(self, key, value):
if key in self.data:
del self.data[key]
self.data[key] = (time.monotonic(), value)
self.cull()
# added by mylsef
def delete(self, key):
self.cull()
if key in self.data:
del self.data[key]
def cull(self):
for _, _ in self.iter_older_than(self.ttl):
self.data.popitem(last=False)
def get(self, key, default=None):
self.cull()
if key in self.data:
return self[key]
return default
def __getitem__(self, key):
self.cull()
return self.data[key][1]
def __repr__(self):
self.cull()
return repr(self.data)
def iter_older_than(self, seconds_old):
min_birthday = time.monotonic() - seconds_old
zipped = self._triple_iter()
matches = takewhile(lambda r: min_birthday >= r[1], zipped)
return list(map(operator.itemgetter(0, 2), matches))
def _triple_iter(self):
ikeys = self.data.keys()
ibirthday = map(operator.itemgetter(0), self.data.values())
ivalues = map(operator.itemgetter(1), self.data.values())
return zip(ikeys, ibirthday, ivalues)
def __iter__(self):
self.cull()
ikeys = self.data.keys()
ivalues = map(operator.itemgetter(1), self.data.values())
return zip(ikeys, ivalues)
class AwesomeStorage(IStorage):
def __init__(self, ttl=604800):
self.data_tag = OrderedDict()
self.data_file = OrderedDict()
self.max_age = ttl
def __setitem__(self, key, value):
return IStorage.__setitem__(key,value)
# { tagid, (time, set( fileid ) ) }
def set(self, dkey, key, name, value, hash = True):
if dkey in self.data_tag:
s = pickle.loads(self.data_tag[dkey][1])
if hash:
s.add(digest(value))
else:
s.add(value)
self.data_tag[dkey] = (time.monotonic(), pickle.dumps(s))
else:
s = set()
if hash:
s.add(digest(value))
else:
s.add(value)
self.data_tag[dkey] = (time.monotonic(), pickle.dumps(s))
dvalue = value
if hash:
dvalue = digest(value)
self.set_file(dvalue, value, key, name)
self.cull()
def set_file(self, key, value, tag, name):
"""
self.data_file[key] = (time.monotonic(), pickle.dumps(value))
"""
if key in self.data_file:
f,t,_ = pickle.loads(self.data_file[key][1])
tags = pickle.loads(t)
tags.add(tag)
self.data_file[key] = (time.monotonic(), pickle.dumps((f, pickle.dumps(tags),_)))
else:
tags = set()
tags.add(tag)
self.data_file[key] = (time.monotonic(), pickle.dumps((pickle.dumps(value), pickle.dumps(tags), name)))
self.cull()
def cull(self):
for _, _ in self.iter_older_than(self.max_age):
self.data_tag.popitem(last = False)
def get(self, key, default = None):
self.cull()
# print('--------------get-------------')
# print(key)
# print(self.data_file)
if key in self.data_tag:
# print('in here')
return self.data_tag[key][1]
if key in self.data_file:
return self.data_file[key][1]
return default
def get_file(self, key, default = None):
self.cull()
if key in self.data_file:
return pickle.loads(self.data_file[key][1])
return default
def __getitem__(self, key):
self.cull()
return self.data_tag[key][1]
def __iter__(self):
self.cull()
ikeys = self.data_tag.keys()
ivalues = map(operator.itemgetter(1), self.data_tag.values())
return zip(ikeys, ivalues)
def delete(self, key):
self.cull()
del self.data_file[key]
def delete_tag(self, dkey ,key, value):
self.cull()
# print('----------delete-tags----------')
# print(dkey)
# print(key)
# print(value)
if dkey in self.data_tag:
files = pickle.loads(self.data_tag[dkey][1])
# d = digest(value)
if value in files:
files.remove(value)
self.data_tag[dkey] = (time.monotonic(), pickle.dumps(files))
if value in self.data_file:
f, t, _ = pickle.loads(self.data_file[value][1])
tags = pickle.loads(t)
# print('tagssssssssssssssssss')
# print(tags)
# input()
if key in tags:
# print('here---------------')
tags.remove(key)
# print(tags)
self.data_file[value] = (time.monotonic(), pickle.dumps((f, pickle.dumps(tags), _)))
def __repr__(self):
self.cull()
return repr(self.data_tag)
def iter_older_than(self, seconds_old):
t = time.monotonic() - seconds_old
zipped = self._triple_iter()
matches = takewhile(lambda r: t >= r[1], zipped)
return list(map(operator.itemgetter(0,2),matches))
def _triple_iter(self):
ikeys = self.data_tag.keys()
it = map(operator.itemgetter(0),self.data_tag.values())
ivalues = map(operator.itemgetter(1), self.data_tag.values())
return zip(ikeys, it, ivalues)