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https://github.com/samsonjs/vdirsyncer.git
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71 lines
1.9 KiB
Python
71 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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'''
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vdirsyncer.storage.memory
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~~~~~~~~~~~~~~~~~~~~~~~~~
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:copyright: (c) 2014 Markus Unterwaditzer & contributors
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:license: MIT, see LICENSE for more details.
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'''
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import random
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import vdirsyncer.exceptions as exceptions
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from vdirsyncer.storage.base import Storage
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def _random_string():
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return '{:.9f}'.format(random.random())
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class MemoryStorage(Storage):
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'''
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Saves data in RAM, only useful for testing.
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'''
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def __init__(self, fileext='', **kwargs):
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if kwargs.get('collection') is not None:
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raise ValueError('MemoryStorage does not support collections.')
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self.items = {} # href => (etag, item)
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self.fileext = fileext
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super(MemoryStorage, self).__init__(**kwargs)
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def _get_href(self, item):
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return item.ident + self.fileext
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def list(self):
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for href, (etag, item) in self.items.items():
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yield href, etag
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def get(self, href):
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etag, item = self.items[href]
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return item, etag
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def has(self, href):
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return href in self.items
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def upload(self, item):
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href = self._get_href(item)
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if href in self.items:
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raise exceptions.AlreadyExistingError(item)
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etag = _random_string()
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self.items[href] = (etag, item)
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return href, etag
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def update(self, href, item, etag):
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if href not in self.items:
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raise exceptions.NotFoundError(href)
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actual_etag, _ = self.items[href]
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if etag != actual_etag:
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raise exceptions.WrongEtagError(etag, actual_etag)
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new_etag = _random_string()
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self.items[href] = (new_etag, item)
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return new_etag
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def delete(self, href, etag):
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if not self.has(href):
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raise exceptions.NotFoundError(href)
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if etag != self.items[href][0]:
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raise exceptions.WrongEtagError(etag)
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del self.items[href]
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