forked from NextTuesday/py-pb-converters
-
Notifications
You must be signed in to change notification settings - Fork 0
/
pbjson.py
179 lines (163 loc) · 7.1 KB
/
pbjson.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
#
# 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
try:
from google.protobuf.internal.containers import ScalarMap as ScalarMap
from google.protobuf.internal.containers import MessageMap as MessageMap
except:
class ScalarMap(object):
pass
class MessageMap(object):
pass
class ConvertException(Exception):
pass
def dict2pb(cls, adict, strict=False, extend=None):
names = []
extensions = {}
if extend:
names = extend.DESCRIPTOR.extensions_by_name.keys()
for name in names:
attr = getattr(extend, name)
if attr.containing_type in extensions:
extensions[attr.containing_type].append(attr)
else:
extensions[attr.containing_type]=[attr]
return dict2pb_(cls, adict, strict, extensions)
def dict2pb_(cls, adict, strict=False, extensions={}):
"""
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)))
if obj.DESCRIPTOR in extensions:
for field in extensions[obj.DESCRIPTOR]:
if not field.name in adict or None == adict[field.name]:
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, 'Extensions')[field].add()
item.CopyFrom(dict2pb_(msg_type._concrete_class, sub_dict, strict, extensions))
else:
map(getattr(obj, 'Extensions')[field].append, adict[field.name])
else:
if field.type == FD.TYPE_MESSAGE:
value = dict2pb_(msg_type._concrete_class, adict[field.name], strict, extensions)
getattr(obj, 'Extensions')[field].CopyFrom(value)
else:
getattr(obj, 'Extensions')[field] = adict[field.name]
for field in obj.DESCRIPTOR.fields:
if not field.name in adict:
continue
msg_type = field.message_type
if isinstance(getattr(obj, field.name), ScalarMap):
for k,v in adict[field.name].iteritems():
getattr(obj, field.name)[k] = v
elif isinstance(getattr(obj, field.name), MessageMap):
for k,v in adict[field.name].iteritems():
m = getattr(obj, field.name)[k]
m.CopyFrom(dict2pb_(m.__class__, v, strict, extensions))
elif 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, strict, extensions))
else:
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], strict, extensions)
getattr(obj, field.name).CopyFrom(value)
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,value in obj.ListFields():
if field.label == FD.LABEL_REPEATED:
if field.type == FD.TYPE_MESSAGE:
if not field.is_extension:
adict[field.name] = \
[pb2dict(v) for v in getattr(obj, field.name)]
else:
adict[field.name] = \
[pb2dict(v) for v in getattr(obj, 'Extensions')[field]]
else:
if not field.is_extension:
adict[field.name] = [v for v in getattr(obj, field.name)]
else:
adict[field.name] = \
[v for v in getattr(obj, 'Extensions')[field]]
else:
if field.type == FD.TYPE_MESSAGE:
if not field.is_extension:
adict[field.name] = pb2dict(v)
else:
adict[field.name] = pb2dict(getattr(obj, 'Extensions')[field])
else:
if not field.is_extension:
adict[field.name] = getattr(obj, field.name)
else:
adict[field.name] = getattr(obj, 'Extensions')[field]
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)