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# Copyright (C) 2018 Lars Wirzenius
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import json
import os
import muck
class PersistentStore:
def __init__(self, dirname):
self._dirname = dirname
self._log = ChangeLogWriter(self._changelog_filename())
def _changelog_filename(self):
return os.path.join(self._dirname, 'changelog')
def append_change(self, chg):
self._log.append(chg)
def load_memory_store(self):
ms = muck.MemoryStore()
for chg in self._changelog_reader():
ms.change(chg)
return ms
def _changelog_reader(self):
with open(self._changelog_filename()) as f:
for line in f:
entry = json.loads(line.strip())
yield muck.create_change_from_log_entry(entry)
class ChangeLogWriter:
def __init__(self, filename):
mode = os.O_WRONLY | os.O_APPEND | os.O_CREAT
self._fd = os.open(filename, mode, 0o666)
def append(self, chg):
line = json.dumps(chg.as_dict())
line += '\n'
line = line.encode('UTF-8')
os.write(self._fd, line)
def __del__(self): # pragma: no cover
os.close(self._fd)
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