125 lines
5.3 KiB
Python
125 lines
5.3 KiB
Python
# -*- coding: utf-8 -*-
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"utils used by storage"
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# Copyright (C) 2013-2018 Team tiramisu (see AUTHORS for all contributors)
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# ____________________________________________________________
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import os
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from time import time
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from .cache.dictionary import Cache as DictCache
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def _display_classname(obj):
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return(obj.__class__.__name__.lower())
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DEBUG = bool(os.environ.get('DEBUG', False))
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del os
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class Cache(DictCache):
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__slots__ = ('_storage',)
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def __init__(self, storage):
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self._storage = storage
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super().__init__()
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def setcache(self, path, index, val, self_props, props):
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"""add val in cache for a specified path
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if slave, add index
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"""
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if 'cache' in props or 'cache' in self_props:
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if DEBUG:
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print('setcache {} with index {} and value {} in {} ({})'.format(path, index, val,
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_display_classname(self),
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id(self)))
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self._setcache(path, index, val, time())
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elif DEBUG:
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print('not setcache {} with index {} and value {} and props {} and {} in {} ({})'.format(path,
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index,
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val,
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props,
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self_props,
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_display_classname(self),
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id(self)))
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def getcache(self,
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path,
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expires_time,
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index,
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props,
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self_props,
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type_):
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no_cache = False, None
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if 'cache' in props or type_ == 'context_props':
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indexed = self._getcache(path, index)
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if indexed is None:
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return no_cache
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value, timestamp = indexed
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if type_ == 'context_props':
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# cached value is settings properties so value is props
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props = value
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elif type_ == 'self_props':
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# if self_props is None, so cached value is self properties
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# so value is self_props
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self_props = value
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# recheck "cache" value
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if 'cache' in props or 'cache' in props:
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if expires_time and timestamp and \
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('expire' in props or \
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'expire' in self_props):
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ntime = int(time())
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if timestamp + expires_time >= ntime:
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if DEBUG:
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print('getcache in cache (1)', path, value, _display_classname(self),
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id(self), index)
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return True, value
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else:
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if DEBUG:
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print('getcache expired value for path {} < {}'.format(
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timestamp + expires_time, ntime))
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# if expired, remove from cache
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#self.delcache(path)
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else:
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if DEBUG:
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print('getcache in cache (2)', path, value, _display_classname(self),
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id(self), index)
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return True, value
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if DEBUG:
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print('getcache {} with index {} not in {} cache'.format(path, index,
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_display_classname(self)))
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return no_cache
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def delcache(self, path):
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"""remove cache for a specified path
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"""
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if DEBUG:
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print('delcache', path, _display_classname(self), id(self))
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if path in self._cache:
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self._delcache(path)
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def reset_all_cache(self):
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"empty the cache"
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if DEBUG:
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print('reset_all_cache', _display_classname(self), id(self))
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self._reset_all_cache()
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def get_cached(self):
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"""return all values in a dictionary
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please only use it in test purpose
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example: {'path1': {'index1': ('value1', 'time1')}, 'path2': {'index2': ('value2', 'time2', )}}
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"""
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if DEBUG:
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print('get_chached {} for {} ({})'.format(self._cache, _display_classname(self), id(self)))
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return self._get_cached()
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