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139 lines
4.9 KiB
Python
139 lines
4.9 KiB
Python
# JSON serialization support for Google's protobuf Messages
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# Copyright (c) 2009, Paul Dovbush
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# All rights reserved.
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# http://code.google.com/p/protobuf-json/
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of <ORGANIZATION> nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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'''
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Provide serialization and de-serialization of Google's protobuf Messages into/from JSON format.
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'''
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# groups are deprecated and not supported;
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# Note that preservation of unknown fields is currently not available for Python (c) google docs
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# extensions is not supported from 0.0.5 (due to gpb2.3 changes)
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__version__ = '0.0.5'
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__author__ = 'Paul Dovbush <dpp@dpp.su>'
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import json # py2.6+ TODO: add support for other JSON serialization modules
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from google.protobuf.descriptor import FieldDescriptor as FD
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class ParseError(Exception): pass
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def json2pb(pb, js):
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''' convert JSON string to google.protobuf.descriptor instance '''
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for field in pb.DESCRIPTOR.fields:
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if field.name not in js:
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continue
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if field.type == FD.TYPE_MESSAGE:
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pass
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elif field.type in _js2ftype:
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ftype = _js2ftype[field.type]
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else:
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raise ParseError("Field %s.%s of type '%d' is not supported" % (pb.__class__.__name__, field.name, field.type,))
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value = js[field.name]
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if field.label == FD.LABEL_REPEATED:
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pb_value = getattr(pb, field.name, None)
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for v in value:
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if field.type == FD.TYPE_MESSAGE:
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json2pb(pb_value.add(), v)
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else:
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pb_value.append(ftype(v))
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else:
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if field.type == FD.TYPE_MESSAGE:
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json2pb(getattr(pb, field.name, None), value)
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else:
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setattr(pb, field.name, ftype(value))
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return pb
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def pb2json(pb, js={}):
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''' convert google.protobuf.descriptor instance to JSON string '''
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# fields = pb.DESCRIPTOR.fields #all fields
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fields = pb.ListFields() # only filled (including extensions)
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for field, value in fields:
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if field.type == FD.TYPE_MESSAGE:
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ftype = pb2json
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elif field.type in _ftype2js:
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ftype = _ftype2js[field.type]
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else:
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raise ParseError("Field %s.%s of type '%d' is not supported" % (pb.__class__.__name__, field.name, field.type,))
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if field.label == FD.LABEL_REPEATED:
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js_value = []
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for v in value:
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js_value.append(ftype(v))
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else:
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js_value = ftype(value)
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js[field.name] = js_value
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return js
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_ftype2js = {
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FD.TYPE_DOUBLE: float,
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FD.TYPE_FLOAT: float,
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FD.TYPE_INT64: long,
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FD.TYPE_UINT64: long,
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FD.TYPE_INT32: int,
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FD.TYPE_FIXED64: float,
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FD.TYPE_FIXED32: float,
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FD.TYPE_BOOL: bool,
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FD.TYPE_STRING: unicode,
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# FD.TYPE_MESSAGE: pb2json, #handled specially
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FD.TYPE_BYTES: lambda x: x.encode('string_escape'),
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FD.TYPE_UINT32: int,
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FD.TYPE_ENUM: int,
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FD.TYPE_SFIXED32: float,
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FD.TYPE_SFIXED64: float,
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FD.TYPE_SINT32: int,
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FD.TYPE_SINT64: long,
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}
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_js2ftype = {
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FD.TYPE_DOUBLE: float,
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FD.TYPE_FLOAT: float,
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FD.TYPE_INT64: long,
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FD.TYPE_UINT64: long,
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FD.TYPE_INT32: int,
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FD.TYPE_FIXED64: float,
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FD.TYPE_FIXED32: float,
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FD.TYPE_BOOL: bool,
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FD.TYPE_STRING: unicode,
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# FD.TYPE_MESSAGE: json2pb, #handled specially
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FD.TYPE_BYTES: lambda x: x.decode('string_escape'),
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FD.TYPE_UINT32: int,
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FD.TYPE_ENUM: int,
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FD.TYPE_SFIXED32: float,
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FD.TYPE_SFIXED64: float,
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FD.TYPE_SINT32: int,
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FD.TYPE_SINT64: long,
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}
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