# -*- coding: utf-8 -*-
#
# Copyright (c) 2013, Next Tuesday GmbH
# Authored by: Seif Lotfy <sfl@nexttuesday.de>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are
# those of the authors and should not be interpreted as representing official
# policies, either expressed or implied, of the FreeBSD Project.
#
import simplejson
from google.protobuf.descriptor import FieldDescriptor as FD
class ConvertException(Exception):
pass
def dict2pb(cls, adict, strict=False):
"""
Takes a class representing the ProtoBuf Message and fills it with data from
the dict.
"""
obj = cls()
for field in obj.DESCRIPTOR.fields:
if not field.label == field.LABEL_REQUIRED:
continue
if not field.has_default_value:
continue
if not field.name in adict:
raise ConvertException('Field "%s" missing from descriptor dictionary.'
% field.name)
field_names = set([field.name for field in obj.DESCRIPTOR.fields])
if strict:
for key in adict.keys():
if key not in field_names:
raise ConvertException(
'Key "%s" can not be mapped to field in %s class.'
% (key, type(obj)))
for field in obj.DESCRIPTOR.fields:
if not field.name in adict:
continue
msg_type = field.message_type
if field.label == FD.LABEL_REPEATED:
if field.type == FD.TYPE_MESSAGE:
for sub_dict in adict[field.name]:
item = getattr(obj, field.name).add()
item.CopyFrom(dict2pb(msg_type._concrete_class, sub_dict))
else:
# fix python3 map用法变更
list(map(getattr(obj, field.name).append, adict[field.name]))
else:
if field.type == FD.TYPE_MESSAGE:
value = dict2pb(msg_type._concrete_class, adict[field.name])
getattr(obj, field.name).CopyFrom(value)
elif field.type in [FD.TYPE_UINT64, FD.TYPE_INT64, FD.TYPE_SINT64]:
setattr(obj, field.name, int(adict[field.name]))
else:
setattr(obj, field.name, adict[field.name])
return obj
def pb2dict(obj):
"""
Takes a ProtoBuf Message obj and convertes it to a dict.
"""
adict = {}
if not obj.IsInitialized():
return None
for field in obj.DESCRIPTOR.fields:
if not getattr(obj, field.name):
continue
if not field.label == FD.LABEL_REPEATED:
if not field.type == FD.TYPE_MESSAGE:
adict[field.name] = getattr(obj, field.name)
else:
value = pb2dict(getattr(obj, field.name))
if value:
adict[field.name] = value
else:
if field.type == FD.TYPE_MESSAGE:
adict[field.name] = \
[pb2dict(v) for v in getattr(obj, field.name)]
else:
adict[field.name] = [v for v in getattr(obj, field.name)]
return adict
def json2pb(cls, json, strict=False):
"""
Takes a class representing the Protobuf Message and fills it with data from
the json string.
"""
return dict2pb(cls, simplejson.loads(json), strict)
def pb2json(obj):
"""
Takes a ProtoBuf Message obj and convertes it to a json string.
"""
return simplejson.dumps(pb2dict(obj), sort_keys=True, indent=4)
