/usr/lib/python3/dist-packages/cloudkitty/state.py is in python3-cloudkitty 7.0.0-4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | # -*- coding: utf-8 -*-
# Copyright 2014 Objectif Libre
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
# @author: Stéphane Albert
#
import decimal
import json
from cloudkitty.db import api
class StateManager(object):
def __init__(self, state_backend, state_basepath, user_id, report_type,
distributed=False):
self._backend = state_backend
self._basepath = state_basepath
self._uid = user_id
self._type = report_type
self._distributed = distributed
# States
self._ts = None
self._metadata = {}
# Load states
self._load()
def _gen_filename(self):
# FIXME(sheeprine): Basepath can't be enforced at the moment
filename = '{0}_{1}.state'.format(self._type,
self._uid)
return filename
def _open(self, mode='rb'):
filename = self._gen_filename()
state_file = self._backend(filename, mode)
return state_file
def _load(self):
try:
state_file = self._open()
raw_data = state_file.read()
if raw_data:
state_data = json.loads(raw_data)
self._ts = state_data['timestamp']
self._metadata = state_data['metadata']
state_file.close()
except IOError:
pass
def _update(self):
state_file = self._open('wb')
state_data = {'timestamp': self._ts,
'metadata': self._metadata}
state_file.write(json.dumps(state_data))
state_file.close()
def set_state(self, timestamp):
"""Set the current state's timestamp."""
if self._distributed:
self._load()
self._ts = timestamp
self._update()
def get_state(self):
"""Get the state timestamp."""
if self._distributed:
self._load()
return self._ts
def set_metadata(self, metadata):
"""Set metadata attached to the state."""
if self._distributed:
self._load()
self._metadata = metadata
self._update()
def get_metadata(self):
"""Get metadata attached to the state."""
if self._distributed:
self._load()
return self._metadata
class DecimalJSONEncoder(json.JSONEncoder):
"""Wrapper class to handle decimal.Decimal objects in json.dumps()."""
def default(self, obj):
if isinstance(obj, decimal.Decimal):
return float(obj)
return super(DecimalJSONEncoder, self).default(obj)
class DBStateManager(object):
def __init__(self, user_id, report_type, distributed=False):
self._state_name = self._gen_name(report_type, user_id)
self._distributed = distributed
self._db = api.get_instance().get_state()
def _gen_name(self, state_type, uid):
name = '{0}_{1}'.format(state_type, uid)
return name
def get_state(self):
"""Get the state timestamp."""
return self._db.get_state(self._state_name)
def set_state(self, timestamp):
"""Set the current state's timestamp."""
self._db.set_state(self._state_name, timestamp)
def get_metadata(self):
"""Get metadata attached to the state."""
data = self._db.get_metadata(self._state_name)
if data:
return json.loads(data)
def set_metadata(self, metadata):
"""Set metadata attached to the state."""
self._db.set_metadata(self._state_name,
json.dumps(metadata, cls=DecimalJSONEncoder))
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