61 lines
1.6 KiB
Python
61 lines
1.6 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 json
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from oslo_utils import encodeutils
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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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class OverflowedJSONInteger(OverflowError):
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"""JSON integer is too large."""
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pass
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def _json_int(s):
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"""Parse a string as a base 10 64-bit signed integer."""
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i = int(s)
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if not (int(-2 ** 63) <= i <= int(2 ** 63 - 1)):
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raise OverflowedJSONInteger()
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return i
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def read_json(stream, len):
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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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:param len: the number of bytes to read from stream
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"""
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try:
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content = encodeutils.safe_decode(stream.read(len), 'utf-8')
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return json.loads(content, parse_int=_json_int)
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except UnicodeDecodeError as ex:
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raise MalformedJSON(ex)
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except ValueError as ex:
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raise MalformedJSON(ex)
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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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