71 lines
1.9 KiB
Python
71 lines
1.9 KiB
Python
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011, Nicira Networks, Inc.
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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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# Borrowed from nova code base, more utilities will be added/borrowed as and
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# when needed.
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# @author: Somik Behera, Nicira Networks, Inc.
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"""Utilities and helper functions."""
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import datetime
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import json
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import os
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def env(*vars, **kwargs):
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"""
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returns the first environment variable set
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if none are non-empty, defaults to '' or keyword arg default
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"""
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for v in vars:
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value = os.environ.get(v)
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if value:
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return value
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return kwargs.get('default', '')
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def to_primitive(value):
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if type(value) is type([]) or type(value) is type((None,)):
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o = []
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for v in value:
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o.append(to_primitive(v))
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return o
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elif type(value) is type({}):
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o = {}
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for k, v in value.iteritems():
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o[k] = to_primitive(v)
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return o
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elif isinstance(value, datetime.datetime):
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return str(value)
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elif hasattr(value, 'iteritems'):
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return to_primitive(dict(value.iteritems()))
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elif hasattr(value, '__iter__'):
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return to_primitive(list(value))
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else:
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return value
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def dumps(value):
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try:
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return json.dumps(value)
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except TypeError:
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pass
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return json.dumps(to_primitive(value))
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def loads(s):
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return json.loads(s)
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