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# Copyright (c) 2014 Mirantis, Inc.
#
# 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.
import functools
import os
from oslo_log import log as logging
from muranodashboard.common import utils
from muranodashboard.environments import consts
LOG = logging.getLogger(__name__)
OBJS_PATH = os.path.join(consts.CACHE_DIR, 'apps')
if not os.path.exists(OBJS_PATH):
os.makedirs(OBJS_PATH)
LOG.info('Creating apps cache directory located at {dir}'.
format(dir=OBJS_PATH))
LOG.info('Using apps cache directory located at {dir}'.
format(dir=OBJS_PATH))
def _get_entry_path(app_id):
head, tail = app_id[:2], app_id[2:]
head = os.path.join(OBJS_PATH, head)
if not os.path.exists(head):
os.mkdir(head)
tail = os.path.join(head, tail)
if not os.path.exists(tail):
os.mkdir(tail)
return tail
def _load_from_file(file_name):
if os.path.isfile(file_name) and os.path.getsize(file_name) > 0:
with open(file_name, 'rb') as f:
p = utils.CustomUnpickler(f)
return p.load()
return None
def _save_to_file(file_name, content):
dir_path = os.path.dirname(file_name)
if not os.path.exists(dir_path):
os.makedirs(dir_path)
with open(file_name, 'wb') as f:
p = utils.CustomPickler(f)
p.dump(content)
def with_cache(*dst_parts):
def _decorator(func):
@functools.wraps(func)
def __inner(request, app_id):
path = os.path.join(_get_entry_path(app_id), *dst_parts)
# Remove file extensions since file content is pickled and
# could not be open as usual files
path = os.path.splitext(path)[0] + '-pickled'
content = _load_from_file(path)
if content is None:
content = func(request, app_id)
if content:
LOG.debug('Caching value at {0}.'.format(path))
_save_to_file(path, content)
else:
LOG.debug('Using cached value from {0}.'.format(path))
return content
return __inner
return _decorator
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