100 lines
2.7 KiB
Python
100 lines
2.7 KiB
Python
# Copyright 2017, Kevin Carter <kevin@cloudnull.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Common code for utils."""
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import os
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import shelve
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import sys
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import tempfile
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# Lower import to support conditional configuration parser
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try:
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if sys.version_info > (3, 2, 0):
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import configparser as ConfigParser
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else:
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import ConfigParser
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except ImportError:
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raise SystemExit('No configparser module was found.')
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def is_int(value):
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"""Check if a variable is an integer."""
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for v_type in [int, float]:
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try:
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value = v_type(value)
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except ValueError:
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pass # v was not a int, float, or long
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else:
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return value
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else:
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return value
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class LocalCache(object):
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"""Context Manager for opening and closing access to the DBM."""
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def __init__(self):
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"""Initialization method for class."""
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"""Set the Path to the DBM to create/Open."""
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self.db_cache = os.path.join(
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tempfile.gettempdir(),
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'monitorstack.openstack.dbm'
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)
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def __enter__(self):
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"""Open the DBM in r/w mode.
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:return: Open DBM
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"""
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return self.open_shelve
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def __exit__(self, type, value, traceback):
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"""Close DBM Connection."""
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self.close_shelve()
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def _open_shelve(self):
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return shelve.open(self.db_cache)
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@property
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def open_shelve(self):
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"""Open shelved data."""
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return self._open_shelve()
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def close_shelve(self):
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"""Close shelved data."""
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self.open_shelve.close()
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def read_config(config_file):
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"""Read an OpenStack configuration."""
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cfg = os.path.abspath(os.path.expanduser(config_file))
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if not os.path.isfile(cfg):
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raise IOError('Config file "{}" was not found'.format(cfg))
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parser = ConfigParser.ConfigParser()
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parser.optionxform = str
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parser.read([cfg])
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args = dict()
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defaults = dict([(k, v) for k, v in parser.items(section='DEFAULT')])
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for section in parser.sections():
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if section == 'DEFAULT':
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continue
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sec = args[section] = defaults
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for key, value in parser.items(section):
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sec[key] = is_int(value=value)
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return args
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