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# Copyright (C) 2018-2019 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 copy
import os
import urllib.parse
import yaml
import ick2
class PersistentStateInterface: # pragma: no cover
def get_resource_ids(self, kind):
raise NotImplementedError()
def has_resource(self, kind, rid):
raise NotImplementedError()
def get_resource(self, kind, rid):
raise NotImplementedError()
def get_resources(self, kind):
return [
self.get_resource(kind, rid)
for rid in self.get_resource_ids(kind)
]
def write_resource(self, kind, rid, resource):
raise NotImplementedError()
def remove_resource(self, kind, rid):
raise NotImplementedError()
class FilePersistentState(PersistentStateInterface):
def __init__(self):
self._dir = None
def get_directory(self):
return self._dir
def set_directory(self, dirname):
self._dir = dirname
def _safe(self, name):
return urllib.parse.quote(name, safe='')
def _unsafe(self, safe):
return urllib.parse.unquote(safe)
def _unsafe_list(self, safe_names):
return [self._unsafe(safe) for safe in safe_names]
def _dirname(self, kind):
return os.path.join(self._dir, self._safe(kind))
def _filename(self, kind, rid):
dirname = self._dirname(kind)
return os.path.join(dirname, self._safe(rid))
def has_resource(self, kind, rid):
filename = self._filename(kind, rid)
return os.path.exists(filename)
def get_resource_ids(self, kind):
dirname = self._dirname(kind)
if os.path.exists(dirname):
return self._unsafe_list(os.listdir(dirname))
return []
def get_resource(self, kind, rid):
filename = self._filename(kind, rid)
if not os.path.exists(filename):
raise ick2.NotFound(kind=kind, rid=rid)
with open(filename, 'r') as f:
as_dict = yaml.load(f, Loader=yaml.CSafeLoader)
return resource_from_dict(as_dict)
def write_resource(self, kind, rid, resource):
dirname = self._dirname(kind)
if not os.path.exists(dirname):
os.makedirs(dirname)
filename = self._filename(kind, rid)
with open(filename, 'w') as f:
yaml.dump(
resource.as_dict(), stream=f, Dumper=yaml.CSafeDumper)
def remove_resource(self, kind, rid):
filename = self._filename(kind, rid)
os.remove(filename)
class NotFound(Exception):
def __init__(self, kind, rid):
super().__init__(
'Resource {}:{} not found'.format(
kind or "unknown", rid or "unknown"))
class Resource: # pragma: no cover
def __init__(self, as_dict=None):
self._dict = copy.deepcopy(as_dict or {})
def as_dict(self):
return copy.deepcopy(self._dict)
def __getitem__(self, key):
return self._dict[key]
def __setitem__(self, key, value):
self._dict[key] = value
def __contains__(self, key):
return key in self._dict
def __len__(self):
return len(self._dict)
def get(self, key, default=None):
return self._dict.get(key, default)
def from_dict(self, as_dict):
self._dict.clear()
for key in as_dict:
self[key] = as_dict[key]
def resource_from_dict(as_dict): # pragma: no cover
return Resource(as_dict)
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