5f87afafcd
This patch localizes try...except blocks, DRYs construction of certain HTTP exceptions, and modifies what types of exceptions are thrown (in some cases), to be more precise. I also factored out some input validation code that happened to be mixed up with all the exception handling. Implements: blueprint grizzly-debt Change-Id: I1030308bed1ec55477b176bf022118d53b46b7ff
50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
# Copyright (c) 2013 Rackspace, Inc.
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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
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# 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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import simplejson as json
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class MalformedJSON(ValueError):
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"""JSON string is not valid."""
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pass
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def read_json(stream):
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"""Like json.load, but converts ValueError to MalformedJSON upon failure.
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:param stream: a file-like object
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"""
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try:
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return json.load(stream)
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except ValueError as ex:
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raise MalformedJSON(ex.message)
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def to_json(obj):
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"""Like json.dumps, but outputs a UTF-8 encoded string.
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:param obj: a JSON-serializable object
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"""
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return json.dumps(obj, ensure_ascii=False)
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def purge(src):
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"""Returns a copy of a dict, excluding any keys set to `None`.
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:param src: a dictionary-like object to copy
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"""
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return dict([(k, v) for k, v in src.items() if v is not None])
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