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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 ick2
def wrap(kind, name, as_dict):
return {
'kind': kind,
'name': name,
'res': copy.deepcopy(as_dict),
}
def unwrap(obj):
return obj['kind'], obj['name'], copy.deepcopy(obj['res'])
def find_by_name(store, token, kind, name):
rids = store.search(token, None) # FIXME for real searches
for rid in rids:
obj, rev = store.show(token, rid)
if obj is not None:
okind, oname, as_dict = unwrap(obj)
if okind == kind and oname == name:
return as_dict, rid, rev
raise ick2.NotFound(kind=kind, name=name)
def find_names_by_kind(store, token, kind):
rids = store.search(token, None) # FIXME for real searches
for rid in rids:
obj, rev = store.show(token, rid)
if obj is not None:
okind, oname, as_dict = unwrap(obj)
if okind == kind:
yield oname
class TransactionalResource:
def __init__(self, new, token, store, kind, name):
self.token = token
self.store = store
self.kind = kind
self.name = name
self.rid = None
self.rev = None
self.resource = None
if new:
try:
find_by_name(self.store, token, kind, name)
except ick2.NotFound:
as_dict = {}
else:
raise ick2.ExistsAlready(name)
else:
try:
as_dict, self.rid, self.rev = find_by_name(
self.store, token, kind, name)
except ick2.NotFound:
raise
self.resource = ick2.resource_from_dict(as_dict)
assert ((new and self.rid is None) or
(not new and self.rid is not None))
methods = [
'as_dict',
'__getitem__',
'__setitem__',
'__contains__',
'__len__',
]
for method in methods:
setattr(self, method, getattr(self.resource, method))
def __enter__(self):
return self.resource
def __exit__(self, exc_type, value, traceback):
if exc_type is None:
as_dict = self.resource.as_dict()
obj = wrap(self.kind, self.name, as_dict)
if self.rid is None:
self.store.create(self.token, obj)
else:
self.store.update(self.token, self.rid, obj, self.rev)
class TransactionalState:
def __init__(self, state):
self.state = state
def new(self, token, kind, name):
return TransactionalResource(True, token, self.state, kind, name)
def modify(self, token, kind, name):
return TransactionalResource(False, token, self.state, kind, name)
def get_resource(self, token, kind, name):
as_dict, rid, rev = find_by_name(self.state, token, kind, name)
return ick2.resource_from_dict(as_dict)
def get_resources(self, token, kind):
return [
self.get_resource(token, kind, name)
for name in find_names_by_kind(self.state, token, kind)
]
def remove_resource(self, token, kind, name):
as_dict, rid, rev = find_by_name(self.state, token, kind, name)
self.state.delete(token, rid)
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