Current File : //lib/python3.6/site-packages/dnf/persistor.py
# persistor.py
# Persistence data container.
#
# Copyright (C) 2013-2016 Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details. You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#
# The current implementation is storing to files in persistdir. Do not depend on
# specific files existing, instead use the persistor API. The underlying
# implementation can change, e.g. for one general file with a serialized dict of
# data etc.
from __future__ import absolute_import
from __future__ import unicode_literals
from dnf.i18n import _
import distutils.version
import dnf.util
import errno
import fnmatch
import json
import logging
import os
import re
logger = logging.getLogger("dnf")
class JSONDB(object):
def _check_json_db(self, json_path):
if not os.path.isfile(json_path):
# initialize new db
dnf.util.ensure_dir(os.path.dirname(json_path))
self._write_json_db(json_path, [])
def _get_json_db(self, json_path, default=[]):
with open(json_path, 'r') as f:
content = f.read()
if content == "":
# empty file is invalid json format
logger.warning(_("%s is empty file"), json_path)
self._write_json_db(json_path, default)
else:
try:
default = json.loads(content)
except ValueError as e:
logger.warning(e)
return default
@staticmethod
def _write_json_db(json_path, content):
with open(json_path, 'w') as f:
json.dump(content, f)
class RepoPersistor(JSONDB):
"""Persistent data kept for repositories.
Is arch/releasever specific and stores to cachedir.
"""
def __init__(self, cachedir):
self.cachedir = cachedir
self.db_path = os.path.join(self.cachedir, "expired_repos.json")
self.expired_to_add = set()
self.reset_last_makecache = False
@property
def _last_makecache_path(self):
return os.path.join(self.cachedir, "last_makecache")
def get_expired_repos(self):
try:
self._check_json_db(self.db_path)
return set(self._get_json_db(self.db_path))
except OSError as e:
logger.warning(_("Failed to load expired repos cache: %s"), e)
return None
def save(self):
try:
self._check_json_db(self.db_path)
self._write_json_db(self.db_path, list(self.expired_to_add))
except OSError as e:
logger.warning(_("Failed to store expired repos cache: %s"), e)
return False
if self.reset_last_makecache:
try:
dnf.util.touch(self._last_makecache_path)
return True
except IOError:
logger.warning(_("Failed storing last makecache time."))
return False
def since_last_makecache(self):
try:
return int(dnf.util.file_age(self._last_makecache_path))
except OSError:
logger.warning(_("Failed determining last makecache time."))
return None
class TempfilePersistor(JSONDB):
def __init__(self, cachedir):
self.db_path = os.path.join(cachedir, "tempfiles.json")
self.tempfiles_to_add = set()
self._empty = False
def get_saved_tempfiles(self):
self._check_json_db(self.db_path)
return self._get_json_db(self.db_path)
def save(self):
if not self._empty and not self.tempfiles_to_add:
return
self._check_json_db(self.db_path)
if self._empty:
self._write_json_db(self.db_path, [])
return
if self.tempfiles_to_add:
data = set(self._get_json_db(self.db_path))
data.update(self.tempfiles_to_add)
self._write_json_db(self.db_path, list(data))
def empty(self):
self._empty = True
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