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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 os
import yaml
class FileStore:
def __init__(self, dirname):
self._dirname = dirname
def _typedir(self, resource_type):
return os.path.join(self._dirname, resource_type)
def _filename(self, resource_type, resource_id):
dirname = self._typedir(resource_type)
return os.path.join(dirname, resource_id)
def list(self, resource_type):
dirname = self._typedir(resource_type)
if not os.path.isdir(dirname):
return []
return [
x
for x in sorted(os.listdir(self._typedir(resource_type)))
]
def get(self, resource_type, resource_id):
filename = self._filename(resource_type, resource_id)
if os.path.exists(filename):
with open(filename) as f:
return yaml.safe_load(f)
raise ResourceDoesNotExist(resource_type, resource_id)
def create(self, resource_type, resource_id, resource):
dirname = self._typedir(resource_type)
if not os.path.exists(dirname):
os.mkdir(dirname)
filename = self._filename(resource_type, resource_id)
with open(filename, 'w') as f:
yaml.safe_dump(resource, stream=f)
def delete(self, resource_type, resource_id):
filename = self._filename(resource_type, resource_id)
if os.path.exists(filename):
os.remove(filename)
class ResourceStoreError(Exception):
pass
class ResourceDoesNotExist(ResourceStoreError):
def __init__(self, resource_type, resource_id):
super().__init__(
'Resource does not exist: {}:{}'.format(
resource_type, resource_id))
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