124 lines
3.7 KiB
Python
124 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 Objectif Libre
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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from cloudkitty.db import api
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from cloudkitty.utils import json
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class StateManager(object):
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def __init__(self, state_backend, state_basepath, user_id, report_type,
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distributed=False):
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self._backend = state_backend
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self._basepath = state_basepath
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self._uid = user_id
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self._type = report_type
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self._distributed = distributed
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# States
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self._ts = None
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self._metadata = {}
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# Load states
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self._load()
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def _gen_filename(self):
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# FIXME(sheeprine): Basepath can't be enforced at the moment
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filename = '{0}_{1}.state'.format(self._type,
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self._uid)
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return filename
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def _open(self, mode='rb'):
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filename = self._gen_filename()
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state_file = self._backend(filename, mode)
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return state_file
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def _load(self):
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try:
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state_file = self._open()
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raw_data = state_file.read()
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if raw_data:
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state_data = json.loads(raw_data)
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self._ts = state_data['timestamp']
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self._metadata = state_data['metadata']
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state_file.close()
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except IOError:
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pass
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def _update(self):
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state_file = self._open('wb')
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state_data = {'timestamp': self._ts,
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'metadata': self._metadata}
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state_file.write(json.dumps(state_data))
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state_file.close()
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def set_state(self, timestamp):
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"""Set the current state's timestamp."""
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if self._distributed:
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self._load()
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self._ts = timestamp
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self._update()
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def get_state(self):
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"""Get the state timestamp."""
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if self._distributed:
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self._load()
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return self._ts
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def set_metadata(self, metadata):
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"""Set metadata attached to the state."""
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if self._distributed:
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self._load()
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self._metadata = metadata
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self._update()
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def get_metadata(self):
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"""Get metadata attached to the state."""
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if self._distributed:
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self._load()
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return self._metadata
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class DBStateManager(object):
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def __init__(self, user_id, report_type, distributed=False):
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self._state_name = self._gen_name(report_type, user_id)
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self._distributed = distributed
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self._db = api.get_instance().get_state()
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def _gen_name(self, state_type, uid):
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name = '{0}_{1}'.format(state_type, uid)
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return name
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def get_state(self):
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"""Get the state timestamp."""
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return self._db.get_state(self._state_name)
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def set_state(self, timestamp):
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"""Set the current state's timestamp."""
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self._db.set_state(self._state_name, timestamp)
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def get_metadata(self):
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"""Get metadata attached to the state."""
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data = self._db.get_metadata(self._state_name)
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if data:
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return json.loads(data)
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def set_metadata(self, metadata):
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"""Set metadata attached to the state."""
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self._db.set_metadata(self._state_name, json.dumps(metadata))
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