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# Copyright 2015-2016 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import errno
import random
import obnamlib
class GAClientList(object):
_well_known_blob = 'root'
def __init__(self):
self._hooks = None
self._fs = None
self.set_dirname('client-list')
self.clear()
def set_hooks(self, hooks):
self._hooks = hooks
def set_fs(self, fs):
self._fs = fs
def set_dirname(self, dirname):
self._dirname = dirname
def get_dirname(self):
return self._dirname
def clear(self):
self._data = None
self._data_is_loaded = False
self._added_clients = []
self._clear_client_names_cache()
def _clear_client_names_cache(self):
self._client_names = None
def commit(self):
self._load_data()
for client_name in self._added_clients:
self._hooks.call('repository-add-client', self, client_name)
self._save_data()
self._added_clients = []
def _save_data(self):
assert self._data is not None
blob = obnamlib.serialise_object(self._data)
bag_store = obnamlib.BagStore()
bag_store.set_location(self._fs, self.get_dirname())
blob_store = obnamlib.BlobStore()
blob_store.set_bag_store(bag_store)
blob_store.put_well_known_blob(self._well_known_blob, blob)
def get_client_names(self):
self._load_data()
if self._client_names is None:
self._client_names = set(self._data.get('clients', {}).keys())
return self._client_names
def _load_data(self):
if self._data_is_loaded:
assert self._data is not None
else:
assert self._data is None
if not self._data_is_loaded:
bag_store = obnamlib.BagStore()
bag_store.set_location(self._fs, self.get_dirname())
blob_store = obnamlib.BlobStore()
blob_store.set_bag_store(bag_store)
blob = blob_store.get_well_known_blob(self._well_known_blob)
if blob is None:
self._data = {
'clients': {},
}
else:
self._data = obnamlib.deserialise_object(blob)
assert self._data is not None
self._data_is_loaded = True
def get_client_dirname(self, client_name):
self._load_data()
return self._get_dirname_for_client_id(
self._data['clients'][client_name]['client-id'])
def _get_dirname_for_client_id(self, client_id):
return 'clientdir-%s' % client_id
def add_client(self, client_name):
self._load_data()
self._require_client_does_not_exist(client_name)
clients = self._data.get('clients', {})
clients[client_name] = {
'encryption-key': None,
'client-id': self._pick_client_id(),
}
self._data['clients'] = clients
self._clear_client_names_cache()
self._added_clients.append(client_name)
def _pick_client_id(self):
while True:
candidate_id = random.randint(0, obnamlib.MAX_ID)
dirname = self._get_dirname_for_client_id(candidate_id)
try:
self._fs.create_and_init_toplevel(dirname)
except OSError as e:
if e.errno == errno.EEXIST:
continue
raise
return candidate_id
def remove_client(self, client_name):
self._load_data()
self._require_client_exists(client_name)
clients = self._data.get('clients', {})
del clients[client_name]
self._data['clients'] = clients
if client_name in self._added_clients:
self._added_clients.remove(client_name)
self._clear_client_names_cache()
def rename_client(self, old_client_name, new_client_name):
self._load_data()
self._require_client_exists(old_client_name)
self._require_client_does_not_exist(new_client_name)
clients = self._data.get('clients', {})
clients[new_client_name] = clients[old_client_name]
del clients[old_client_name]
self._data['clients'] = clients
if old_client_name in self._added_clients: # pragma: no cover
self._added_clients.remove(old_client_name)
self._added_clients.append(new_client_name)
self._clear_client_names_cache()
def _require_client_exists(self, client_name):
if client_name not in self._data.get('clients', {}):
raise obnamlib.RepositoryClientDoesNotExist(
client_name=client_name)
def _require_client_does_not_exist(self, client_name):
if client_name in self._data.get('clients', {}):
raise obnamlib.RepositoryClientAlreadyExists(
client_name=client_name)
def get_client_encryption_key_id(self, client_name):
self._load_data()
self._require_client_exists(client_name)
return self._data['clients'][client_name]['encryption-key']
def set_client_encryption_key_id(self, client_name, encryption_key):
self._load_data()
self._require_client_exists(client_name)
self._data['clients'][client_name]['encryption-key'] = encryption_key
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