54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
"""
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Copyright 2013 Rackspace, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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"""
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import json
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import uuid
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class Serializable(object):
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"""Base class for things that can be serialized."""
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def serialize(self):
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"""Turn this object into a dict."""
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raise NotImplementedError()
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class RESTJSONEncoder(json.JSONEncoder):
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"""A slightly customized JSON encoder."""
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def encode(self, o):
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"""Turn an object into JSON.
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Appends a newline to responses when configured to pretty-print,
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in order to make use of curl less painful from most shells.
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"""
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delimiter = ''
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# if indent is None, newlines are still inserted, so we should too.
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if self.indent is not None:
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delimiter = '\n'
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return super(RESTJSONEncoder, self).encode(o) + delimiter
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def default(self, o):
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"""Turn an object into a serializable object. In particular, by
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calling :meth:`.Serializable.serialize`.
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"""
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if isinstance(o, Serializable):
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return o.serialize()
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elif isinstance(o, uuid.UUID):
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return str(o)
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else:
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return json.JSONEncoder.default(self, o)
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