861 lines
32 KiB
Python
861 lines
32 KiB
Python
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# Protocol Buffers - Google's data interchange format
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# Copyright 2008 Google Inc. All rights reserved.
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# https://developers.google.com/protocol-buffers/
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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 Google Inc. 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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"""Contains routines for printing protocol messages in JSON format.
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Simple usage example:
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# Create a proto object and serialize it to a json format string.
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message = my_proto_pb2.MyMessage(foo='bar')
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json_string = json_format.MessageToJson(message)
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# Parse a json format string to proto object.
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message = json_format.Parse(json_string, my_proto_pb2.MyMessage())
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"""
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__author__ = 'jieluo@google.com (Jie Luo)'
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# pylint: disable=g-statement-before-imports,g-import-not-at-top
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try:
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from collections import OrderedDict
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except ImportError:
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from ordereddict import OrderedDict # PY26
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# pylint: enable=g-statement-before-imports,g-import-not-at-top
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import base64
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import json
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import math
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from operator import methodcaller
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import re
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import sys
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import six
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from google.protobuf.internal import type_checkers
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from google.protobuf import descriptor
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from google.protobuf import symbol_database
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_TIMESTAMPFOMAT = '%Y-%m-%dT%H:%M:%S'
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_INT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT32,
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descriptor.FieldDescriptor.CPPTYPE_UINT32,
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descriptor.FieldDescriptor.CPPTYPE_INT64,
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descriptor.FieldDescriptor.CPPTYPE_UINT64])
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_INT64_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT64,
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descriptor.FieldDescriptor.CPPTYPE_UINT64])
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_FLOAT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_FLOAT,
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descriptor.FieldDescriptor.CPPTYPE_DOUBLE])
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_INFINITY = 'Infinity'
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_NEG_INFINITY = '-Infinity'
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_NAN = 'NaN'
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_UNPAIRED_SURROGATE_PATTERN = re.compile(six.u(
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r'[\ud800-\udbff](?![\udc00-\udfff])|(?<![\ud800-\udbff])[\udc00-\udfff]'
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))
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_VALID_EXTENSION_NAME = re.compile(r'\[[a-zA-Z0-9\._]*\]$')
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class Error(Exception):
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"""Top-level module error for json_format."""
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class SerializeToJsonError(Error):
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"""Thrown if serialization to JSON fails."""
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class ParseError(Error):
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"""Thrown in case of parsing error."""
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def MessageToJson(
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message,
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including_default_value_fields=False,
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preserving_proto_field_name=False,
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indent=2,
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sort_keys=False,
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use_integers_for_enums=False,
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descriptor_pool=None,
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float_precision=None):
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"""Converts protobuf message to JSON format.
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Args:
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message: The protocol buffers message instance to serialize.
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including_default_value_fields: If True, singular primitive fields,
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repeated fields, and map fields will always be serialized. If
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False, only serialize non-empty fields. Singular message fields
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and oneof fields are not affected by this option.
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preserving_proto_field_name: If True, use the original proto field
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names as defined in the .proto file. If False, convert the field
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names to lowerCamelCase.
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indent: The JSON object will be pretty-printed with this indent level.
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An indent level of 0 or negative will only insert newlines.
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sort_keys: If True, then the output will be sorted by field names.
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use_integers_for_enums: If true, print integers instead of enum names.
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descriptor_pool: A Descriptor Pool for resolving types. If None use the
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default.
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float_precision: If set, use this to specify float field valid digits.
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Returns:
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A string containing the JSON formatted protocol buffer message.
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"""
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printer = _Printer(
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including_default_value_fields,
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preserving_proto_field_name,
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use_integers_for_enums,
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descriptor_pool,
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float_precision=float_precision)
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return printer.ToJsonString(message, indent, sort_keys)
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def MessageToDict(
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message,
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including_default_value_fields=False,
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preserving_proto_field_name=False,
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use_integers_for_enums=False,
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descriptor_pool=None,
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float_precision=None):
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"""Converts protobuf message to a dictionary.
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When the dictionary is encoded to JSON, it conforms to proto3 JSON spec.
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Args:
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message: The protocol buffers message instance to serialize.
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including_default_value_fields: If True, singular primitive fields,
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repeated fields, and map fields will always be serialized. If
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False, only serialize non-empty fields. Singular message fields
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and oneof fields are not affected by this option.
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preserving_proto_field_name: If True, use the original proto field
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names as defined in the .proto file. If False, convert the field
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names to lowerCamelCase.
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use_integers_for_enums: If true, print integers instead of enum names.
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descriptor_pool: A Descriptor Pool for resolving types. If None use the
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default.
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float_precision: If set, use this to specify float field valid digits.
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Returns:
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A dict representation of the protocol buffer message.
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"""
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printer = _Printer(
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including_default_value_fields,
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preserving_proto_field_name,
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use_integers_for_enums,
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descriptor_pool,
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float_precision=float_precision)
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# pylint: disable=protected-access
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return printer._MessageToJsonObject(message)
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def _IsMapEntry(field):
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return (field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
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field.message_type.has_options and
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field.message_type.GetOptions().map_entry)
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class _Printer(object):
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"""JSON format printer for protocol message."""
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def __init__(
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self,
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including_default_value_fields=False,
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preserving_proto_field_name=False,
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use_integers_for_enums=False,
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descriptor_pool=None,
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float_precision=None):
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self.including_default_value_fields = including_default_value_fields
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self.preserving_proto_field_name = preserving_proto_field_name
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self.use_integers_for_enums = use_integers_for_enums
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self.descriptor_pool = descriptor_pool
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if float_precision:
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self.float_format = '.{}g'.format(float_precision)
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else:
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self.float_format = None
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def ToJsonString(self, message, indent, sort_keys):
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js = self._MessageToJsonObject(message)
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return json.dumps(js, indent=indent, sort_keys=sort_keys)
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def _MessageToJsonObject(self, message):
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"""Converts message to an object according to Proto3 JSON Specification."""
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message_descriptor = message.DESCRIPTOR
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full_name = message_descriptor.full_name
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if _IsWrapperMessage(message_descriptor):
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return self._WrapperMessageToJsonObject(message)
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if full_name in _WKTJSONMETHODS:
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return methodcaller(_WKTJSONMETHODS[full_name][0], message)(self)
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js = {}
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return self._RegularMessageToJsonObject(message, js)
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def _RegularMessageToJsonObject(self, message, js):
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"""Converts normal message according to Proto3 JSON Specification."""
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fields = message.ListFields()
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try:
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for field, value in fields:
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if self.preserving_proto_field_name:
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name = field.name
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else:
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name = field.json_name
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if _IsMapEntry(field):
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# Convert a map field.
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v_field = field.message_type.fields_by_name['value']
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js_map = {}
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for key in value:
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if isinstance(key, bool):
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if key:
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recorded_key = 'true'
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else:
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recorded_key = 'false'
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else:
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recorded_key = key
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js_map[recorded_key] = self._FieldToJsonObject(
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v_field, value[key])
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js[name] = js_map
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elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
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# Convert a repeated field.
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js[name] = [self._FieldToJsonObject(field, k)
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for k in value]
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elif field.is_extension:
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name = '[%s]' % field.full_name
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js[name] = self._FieldToJsonObject(field, value)
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else:
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js[name] = self._FieldToJsonObject(field, value)
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# Serialize default value if including_default_value_fields is True.
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if self.including_default_value_fields:
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message_descriptor = message.DESCRIPTOR
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for field in message_descriptor.fields:
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# Singular message fields and oneof fields will not be affected.
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if ((field.label != descriptor.FieldDescriptor.LABEL_REPEATED and
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field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE) or
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field.containing_oneof):
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continue
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if self.preserving_proto_field_name:
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name = field.name
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else:
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name = field.json_name
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if name in js:
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# Skip the field which has been serialized already.
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continue
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if _IsMapEntry(field):
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js[name] = {}
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elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
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js[name] = []
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else:
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js[name] = self._FieldToJsonObject(field, field.default_value)
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except ValueError as e:
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raise SerializeToJsonError(
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'Failed to serialize {0} field: {1}.'.format(field.name, e))
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return js
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def _FieldToJsonObject(self, field, value):
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"""Converts field value according to Proto3 JSON Specification."""
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if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
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return self._MessageToJsonObject(value)
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elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
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if self.use_integers_for_enums:
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return value
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enum_value = field.enum_type.values_by_number.get(value, None)
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if enum_value is not None:
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return enum_value.name
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else:
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if field.file.syntax == 'proto3':
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return value
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raise SerializeToJsonError('Enum field contains an integer value '
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'which can not mapped to an enum value.')
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elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
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if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
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# Use base64 Data encoding for bytes
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return base64.b64encode(value).decode('utf-8')
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else:
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return value
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elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
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return bool(value)
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elif field.cpp_type in _INT64_TYPES:
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return str(value)
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elif field.cpp_type in _FLOAT_TYPES:
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if math.isinf(value):
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if value < 0.0:
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return _NEG_INFINITY
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else:
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return _INFINITY
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if math.isnan(value):
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return _NAN
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if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_FLOAT:
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if self.float_format:
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return float(format(value, self.float_format))
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else:
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return type_checkers.ToShortestFloat(value)
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return value
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def _AnyMessageToJsonObject(self, message):
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"""Converts Any message according to Proto3 JSON Specification."""
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if not message.ListFields():
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return {}
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# Must print @type first, use OrderedDict instead of {}
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js = OrderedDict()
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type_url = message.type_url
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js['@type'] = type_url
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sub_message = _CreateMessageFromTypeUrl(type_url, self.descriptor_pool)
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sub_message.ParseFromString(message.value)
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message_descriptor = sub_message.DESCRIPTOR
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full_name = message_descriptor.full_name
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if _IsWrapperMessage(message_descriptor):
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js['value'] = self._WrapperMessageToJsonObject(sub_message)
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return js
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if full_name in _WKTJSONMETHODS:
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js['value'] = methodcaller(_WKTJSONMETHODS[full_name][0],
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sub_message)(self)
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return js
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return self._RegularMessageToJsonObject(sub_message, js)
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def _GenericMessageToJsonObject(self, message):
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"""Converts message according to Proto3 JSON Specification."""
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# Duration, Timestamp and FieldMask have ToJsonString method to do the
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# convert. Users can also call the method directly.
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return message.ToJsonString()
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def _ValueMessageToJsonObject(self, message):
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"""Converts Value message according to Proto3 JSON Specification."""
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which = message.WhichOneof('kind')
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# If the Value message is not set treat as null_value when serialize
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# to JSON. The parse back result will be different from original message.
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if which is None or which == 'null_value':
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return None
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if which == 'list_value':
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return self._ListValueMessageToJsonObject(message.list_value)
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if which == 'struct_value':
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value = message.struct_value
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else:
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value = getattr(message, which)
|
||
|
|
oneof_descriptor = message.DESCRIPTOR.fields_by_name[which]
|
||
|
|
return self._FieldToJsonObject(oneof_descriptor, value)
|
||
|
|
|
||
|
|
def _ListValueMessageToJsonObject(self, message):
|
||
|
|
"""Converts ListValue message according to Proto3 JSON Specification."""
|
||
|
|
return [self._ValueMessageToJsonObject(value)
|
||
|
|
for value in message.values]
|
||
|
|
|
||
|
|
def _StructMessageToJsonObject(self, message):
|
||
|
|
"""Converts Struct message according to Proto3 JSON Specification."""
|
||
|
|
fields = message.fields
|
||
|
|
ret = {}
|
||
|
|
for key in fields:
|
||
|
|
ret[key] = self._ValueMessageToJsonObject(fields[key])
|
||
|
|
return ret
|
||
|
|
|
||
|
|
def _WrapperMessageToJsonObject(self, message):
|
||
|
|
return self._FieldToJsonObject(
|
||
|
|
message.DESCRIPTOR.fields_by_name['value'], message.value)
|
||
|
|
|
||
|
|
|
||
|
|
def _IsWrapperMessage(message_descriptor):
|
||
|
|
return message_descriptor.file.name == 'google/protobuf/wrappers.proto'
|
||
|
|
|
||
|
|
|
||
|
|
def _DuplicateChecker(js):
|
||
|
|
result = {}
|
||
|
|
for name, value in js:
|
||
|
|
if name in result:
|
||
|
|
raise ParseError('Failed to load JSON: duplicate key {0}.'.format(name))
|
||
|
|
result[name] = value
|
||
|
|
return result
|
||
|
|
|
||
|
|
|
||
|
|
def _CreateMessageFromTypeUrl(type_url, descriptor_pool):
|
||
|
|
"""Creates a message from a type URL."""
|
||
|
|
db = symbol_database.Default()
|
||
|
|
pool = db.pool if descriptor_pool is None else descriptor_pool
|
||
|
|
type_name = type_url.split('/')[-1]
|
||
|
|
try:
|
||
|
|
message_descriptor = pool.FindMessageTypeByName(type_name)
|
||
|
|
except KeyError:
|
||
|
|
raise TypeError(
|
||
|
|
'Can not find message descriptor by type_url: {0}.'.format(type_url))
|
||
|
|
message_class = db.GetPrototype(message_descriptor)
|
||
|
|
return message_class()
|
||
|
|
|
||
|
|
|
||
|
|
def Parse(text, message, ignore_unknown_fields=False, descriptor_pool=None):
|
||
|
|
"""Parses a JSON representation of a protocol message into a message.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
text: Message JSON representation.
|
||
|
|
message: A protocol buffer message to merge into.
|
||
|
|
ignore_unknown_fields: If True, do not raise errors for unknown fields.
|
||
|
|
descriptor_pool: A Descriptor Pool for resolving types. If None use the
|
||
|
|
default.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
The same message passed as argument.
|
||
|
|
|
||
|
|
Raises::
|
||
|
|
ParseError: On JSON parsing problems.
|
||
|
|
"""
|
||
|
|
if not isinstance(text, six.text_type): text = text.decode('utf-8')
|
||
|
|
try:
|
||
|
|
js = json.loads(text, object_pairs_hook=_DuplicateChecker)
|
||
|
|
except ValueError as e:
|
||
|
|
raise ParseError('Failed to load JSON: {0}.'.format(str(e)))
|
||
|
|
return ParseDict(js, message, ignore_unknown_fields, descriptor_pool)
|
||
|
|
|
||
|
|
|
||
|
|
def ParseDict(js_dict,
|
||
|
|
message,
|
||
|
|
ignore_unknown_fields=False,
|
||
|
|
descriptor_pool=None):
|
||
|
|
"""Parses a JSON dictionary representation into a message.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
js_dict: Dict representation of a JSON message.
|
||
|
|
message: A protocol buffer message to merge into.
|
||
|
|
ignore_unknown_fields: If True, do not raise errors for unknown fields.
|
||
|
|
descriptor_pool: A Descriptor Pool for resolving types. If None use the
|
||
|
|
default.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
The same message passed as argument.
|
||
|
|
"""
|
||
|
|
parser = _Parser(ignore_unknown_fields, descriptor_pool)
|
||
|
|
parser.ConvertMessage(js_dict, message)
|
||
|
|
return message
|
||
|
|
|
||
|
|
|
||
|
|
_INT_OR_FLOAT = six.integer_types + (float,)
|
||
|
|
|
||
|
|
|
||
|
|
class _Parser(object):
|
||
|
|
"""JSON format parser for protocol message."""
|
||
|
|
|
||
|
|
def __init__(self, ignore_unknown_fields, descriptor_pool):
|
||
|
|
self.ignore_unknown_fields = ignore_unknown_fields
|
||
|
|
self.descriptor_pool = descriptor_pool
|
||
|
|
|
||
|
|
def ConvertMessage(self, value, message):
|
||
|
|
"""Convert a JSON object into a message.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
value: A JSON object.
|
||
|
|
message: A WKT or regular protocol message to record the data.
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ParseError: In case of convert problems.
|
||
|
|
"""
|
||
|
|
message_descriptor = message.DESCRIPTOR
|
||
|
|
full_name = message_descriptor.full_name
|
||
|
|
if _IsWrapperMessage(message_descriptor):
|
||
|
|
self._ConvertWrapperMessage(value, message)
|
||
|
|
elif full_name in _WKTJSONMETHODS:
|
||
|
|
methodcaller(_WKTJSONMETHODS[full_name][1], value, message)(self)
|
||
|
|
else:
|
||
|
|
self._ConvertFieldValuePair(value, message)
|
||
|
|
|
||
|
|
def _ConvertFieldValuePair(self, js, message):
|
||
|
|
"""Convert field value pairs into regular message.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
js: A JSON object to convert the field value pairs.
|
||
|
|
message: A regular protocol message to record the data.
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ParseError: In case of problems converting.
|
||
|
|
"""
|
||
|
|
names = []
|
||
|
|
message_descriptor = message.DESCRIPTOR
|
||
|
|
fields_by_json_name = dict((f.json_name, f)
|
||
|
|
for f in message_descriptor.fields)
|
||
|
|
for name in js:
|
||
|
|
try:
|
||
|
|
field = fields_by_json_name.get(name, None)
|
||
|
|
if not field:
|
||
|
|
field = message_descriptor.fields_by_name.get(name, None)
|
||
|
|
if not field and _VALID_EXTENSION_NAME.match(name):
|
||
|
|
if not message_descriptor.is_extendable:
|
||
|
|
raise ParseError('Message type {0} does not have extensions'.format(
|
||
|
|
message_descriptor.full_name))
|
||
|
|
identifier = name[1:-1] # strip [] brackets
|
||
|
|
# pylint: disable=protected-access
|
||
|
|
field = message.Extensions._FindExtensionByName(identifier)
|
||
|
|
# pylint: enable=protected-access
|
||
|
|
if not field:
|
||
|
|
# Try looking for extension by the message type name, dropping the
|
||
|
|
# field name following the final . separator in full_name.
|
||
|
|
identifier = '.'.join(identifier.split('.')[:-1])
|
||
|
|
# pylint: disable=protected-access
|
||
|
|
field = message.Extensions._FindExtensionByName(identifier)
|
||
|
|
# pylint: enable=protected-access
|
||
|
|
if not field:
|
||
|
|
if self.ignore_unknown_fields:
|
||
|
|
continue
|
||
|
|
raise ParseError(
|
||
|
|
('Message type "{0}" has no field named "{1}".\n'
|
||
|
|
' Available Fields(except extensions): {2}').format(
|
||
|
|
message_descriptor.full_name, name,
|
||
|
|
[f.json_name for f in message_descriptor.fields]))
|
||
|
|
if name in names:
|
||
|
|
raise ParseError('Message type "{0}" should not have multiple '
|
||
|
|
'"{1}" fields.'.format(
|
||
|
|
message.DESCRIPTOR.full_name, name))
|
||
|
|
names.append(name)
|
||
|
|
# Check no other oneof field is parsed.
|
||
|
|
if field.containing_oneof is not None:
|
||
|
|
oneof_name = field.containing_oneof.name
|
||
|
|
if oneof_name in names:
|
||
|
|
raise ParseError('Message type "{0}" should not have multiple '
|
||
|
|
'"{1}" oneof fields.'.format(
|
||
|
|
message.DESCRIPTOR.full_name, oneof_name))
|
||
|
|
names.append(oneof_name)
|
||
|
|
|
||
|
|
value = js[name]
|
||
|
|
if value is None:
|
||
|
|
if (field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE
|
||
|
|
and field.message_type.full_name == 'google.protobuf.Value'):
|
||
|
|
sub_message = getattr(message, field.name)
|
||
|
|
sub_message.null_value = 0
|
||
|
|
else:
|
||
|
|
message.ClearField(field.name)
|
||
|
|
continue
|
||
|
|
|
||
|
|
# Parse field value.
|
||
|
|
if _IsMapEntry(field):
|
||
|
|
message.ClearField(field.name)
|
||
|
|
self._ConvertMapFieldValue(value, message, field)
|
||
|
|
elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
|
||
|
|
message.ClearField(field.name)
|
||
|
|
if not isinstance(value, list):
|
||
|
|
raise ParseError('repeated field {0} must be in [] which is '
|
||
|
|
'{1}.'.format(name, value))
|
||
|
|
if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
|
||
|
|
# Repeated message field.
|
||
|
|
for item in value:
|
||
|
|
sub_message = getattr(message, field.name).add()
|
||
|
|
# None is a null_value in Value.
|
||
|
|
if (item is None and
|
||
|
|
sub_message.DESCRIPTOR.full_name != 'google.protobuf.Value'):
|
||
|
|
raise ParseError('null is not allowed to be used as an element'
|
||
|
|
' in a repeated field.')
|
||
|
|
self.ConvertMessage(item, sub_message)
|
||
|
|
else:
|
||
|
|
# Repeated scalar field.
|
||
|
|
for item in value:
|
||
|
|
if item is None:
|
||
|
|
raise ParseError('null is not allowed to be used as an element'
|
||
|
|
' in a repeated field.')
|
||
|
|
getattr(message, field.name).append(
|
||
|
|
_ConvertScalarFieldValue(item, field))
|
||
|
|
elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
|
||
|
|
if field.is_extension:
|
||
|
|
sub_message = message.Extensions[field]
|
||
|
|
else:
|
||
|
|
sub_message = getattr(message, field.name)
|
||
|
|
sub_message.SetInParent()
|
||
|
|
self.ConvertMessage(value, sub_message)
|
||
|
|
else:
|
||
|
|
if field.is_extension:
|
||
|
|
message.Extensions[field] = _ConvertScalarFieldValue(value, field)
|
||
|
|
else:
|
||
|
|
setattr(message, field.name, _ConvertScalarFieldValue(value, field))
|
||
|
|
except ParseError as e:
|
||
|
|
if field and field.containing_oneof is None:
|
||
|
|
raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
|
||
|
|
else:
|
||
|
|
raise ParseError(str(e))
|
||
|
|
except ValueError as e:
|
||
|
|
raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
|
||
|
|
except TypeError as e:
|
||
|
|
raise ParseError('Failed to parse {0} field: {1}.'.format(name, e))
|
||
|
|
|
||
|
|
def _ConvertAnyMessage(self, value, message):
|
||
|
|
"""Convert a JSON representation into Any message."""
|
||
|
|
if isinstance(value, dict) and not value:
|
||
|
|
return
|
||
|
|
try:
|
||
|
|
type_url = value['@type']
|
||
|
|
except KeyError:
|
||
|
|
raise ParseError('@type is missing when parsing any message.')
|
||
|
|
|
||
|
|
sub_message = _CreateMessageFromTypeUrl(type_url, self.descriptor_pool)
|
||
|
|
message_descriptor = sub_message.DESCRIPTOR
|
||
|
|
full_name = message_descriptor.full_name
|
||
|
|
if _IsWrapperMessage(message_descriptor):
|
||
|
|
self._ConvertWrapperMessage(value['value'], sub_message)
|
||
|
|
elif full_name in _WKTJSONMETHODS:
|
||
|
|
methodcaller(
|
||
|
|
_WKTJSONMETHODS[full_name][1], value['value'], sub_message)(self)
|
||
|
|
else:
|
||
|
|
del value['@type']
|
||
|
|
self._ConvertFieldValuePair(value, sub_message)
|
||
|
|
value['@type'] = type_url
|
||
|
|
# Sets Any message
|
||
|
|
message.value = sub_message.SerializeToString()
|
||
|
|
message.type_url = type_url
|
||
|
|
|
||
|
|
def _ConvertGenericMessage(self, value, message):
|
||
|
|
"""Convert a JSON representation into message with FromJsonString."""
|
||
|
|
# Duration, Timestamp, FieldMask have a FromJsonString method to do the
|
||
|
|
# conversion. Users can also call the method directly.
|
||
|
|
try:
|
||
|
|
message.FromJsonString(value)
|
||
|
|
except ValueError as e:
|
||
|
|
raise ParseError(e)
|
||
|
|
|
||
|
|
def _ConvertValueMessage(self, value, message):
|
||
|
|
"""Convert a JSON representation into Value message."""
|
||
|
|
if isinstance(value, dict):
|
||
|
|
self._ConvertStructMessage(value, message.struct_value)
|
||
|
|
elif isinstance(value, list):
|
||
|
|
self. _ConvertListValueMessage(value, message.list_value)
|
||
|
|
elif value is None:
|
||
|
|
message.null_value = 0
|
||
|
|
elif isinstance(value, bool):
|
||
|
|
message.bool_value = value
|
||
|
|
elif isinstance(value, six.string_types):
|
||
|
|
message.string_value = value
|
||
|
|
elif isinstance(value, _INT_OR_FLOAT):
|
||
|
|
message.number_value = value
|
||
|
|
else:
|
||
|
|
raise ParseError('Value {0} has unexpected type {1}.'.format(
|
||
|
|
value, type(value)))
|
||
|
|
|
||
|
|
def _ConvertListValueMessage(self, value, message):
|
||
|
|
"""Convert a JSON representation into ListValue message."""
|
||
|
|
if not isinstance(value, list):
|
||
|
|
raise ParseError(
|
||
|
|
'ListValue must be in [] which is {0}.'.format(value))
|
||
|
|
message.ClearField('values')
|
||
|
|
for item in value:
|
||
|
|
self._ConvertValueMessage(item, message.values.add())
|
||
|
|
|
||
|
|
def _ConvertStructMessage(self, value, message):
|
||
|
|
"""Convert a JSON representation into Struct message."""
|
||
|
|
if not isinstance(value, dict):
|
||
|
|
raise ParseError(
|
||
|
|
'Struct must be in a dict which is {0}.'.format(value))
|
||
|
|
# Clear will mark the struct as modified so it will be created even if
|
||
|
|
# there are no values.
|
||
|
|
message.Clear()
|
||
|
|
for key in value:
|
||
|
|
self._ConvertValueMessage(value[key], message.fields[key])
|
||
|
|
return
|
||
|
|
|
||
|
|
def _ConvertWrapperMessage(self, value, message):
|
||
|
|
"""Convert a JSON representation into Wrapper message."""
|
||
|
|
field = message.DESCRIPTOR.fields_by_name['value']
|
||
|
|
setattr(message, 'value', _ConvertScalarFieldValue(value, field))
|
||
|
|
|
||
|
|
def _ConvertMapFieldValue(self, value, message, field):
|
||
|
|
"""Convert map field value for a message map field.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
value: A JSON object to convert the map field value.
|
||
|
|
message: A protocol message to record the converted data.
|
||
|
|
field: The descriptor of the map field to be converted.
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ParseError: In case of convert problems.
|
||
|
|
"""
|
||
|
|
if not isinstance(value, dict):
|
||
|
|
raise ParseError(
|
||
|
|
'Map field {0} must be in a dict which is {1}.'.format(
|
||
|
|
field.name, value))
|
||
|
|
key_field = field.message_type.fields_by_name['key']
|
||
|
|
value_field = field.message_type.fields_by_name['value']
|
||
|
|
for key in value:
|
||
|
|
key_value = _ConvertScalarFieldValue(key, key_field, True)
|
||
|
|
if value_field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
|
||
|
|
self.ConvertMessage(value[key], getattr(
|
||
|
|
message, field.name)[key_value])
|
||
|
|
else:
|
||
|
|
getattr(message, field.name)[key_value] = _ConvertScalarFieldValue(
|
||
|
|
value[key], value_field)
|
||
|
|
|
||
|
|
|
||
|
|
def _ConvertScalarFieldValue(value, field, require_str=False):
|
||
|
|
"""Convert a single scalar field value.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
value: A scalar value to convert the scalar field value.
|
||
|
|
field: The descriptor of the field to convert.
|
||
|
|
require_str: If True, the field value must be a str.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
The converted scalar field value
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ParseError: In case of convert problems.
|
||
|
|
"""
|
||
|
|
if field.cpp_type in _INT_TYPES:
|
||
|
|
return _ConvertInteger(value)
|
||
|
|
elif field.cpp_type in _FLOAT_TYPES:
|
||
|
|
return _ConvertFloat(value, field)
|
||
|
|
elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
|
||
|
|
return _ConvertBool(value, require_str)
|
||
|
|
elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
|
||
|
|
if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
|
||
|
|
if isinstance(value, six.text_type):
|
||
|
|
encoded = value.encode('utf-8')
|
||
|
|
else:
|
||
|
|
encoded = value
|
||
|
|
# Add extra padding '='
|
||
|
|
padded_value = encoded + b'=' * (4 - len(encoded) % 4)
|
||
|
|
return base64.urlsafe_b64decode(padded_value)
|
||
|
|
else:
|
||
|
|
# Checking for unpaired surrogates appears to be unreliable,
|
||
|
|
# depending on the specific Python version, so we check manually.
|
||
|
|
if _UNPAIRED_SURROGATE_PATTERN.search(value):
|
||
|
|
raise ParseError('Unpaired surrogate')
|
||
|
|
return value
|
||
|
|
elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
|
||
|
|
# Convert an enum value.
|
||
|
|
enum_value = field.enum_type.values_by_name.get(value, None)
|
||
|
|
if enum_value is None:
|
||
|
|
try:
|
||
|
|
number = int(value)
|
||
|
|
enum_value = field.enum_type.values_by_number.get(number, None)
|
||
|
|
except ValueError:
|
||
|
|
raise ParseError('Invalid enum value {0} for enum type {1}.'.format(
|
||
|
|
value, field.enum_type.full_name))
|
||
|
|
if enum_value is None:
|
||
|
|
if field.file.syntax == 'proto3':
|
||
|
|
# Proto3 accepts unknown enums.
|
||
|
|
return number
|
||
|
|
raise ParseError('Invalid enum value {0} for enum type {1}.'.format(
|
||
|
|
value, field.enum_type.full_name))
|
||
|
|
return enum_value.number
|
||
|
|
|
||
|
|
|
||
|
|
def _ConvertInteger(value):
|
||
|
|
"""Convert an integer.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
value: A scalar value to convert.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
The integer value.
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ParseError: If an integer couldn't be consumed.
|
||
|
|
"""
|
||
|
|
if isinstance(value, float) and not value.is_integer():
|
||
|
|
raise ParseError('Couldn\'t parse integer: {0}.'.format(value))
|
||
|
|
|
||
|
|
if isinstance(value, six.text_type) and value.find(' ') != -1:
|
||
|
|
raise ParseError('Couldn\'t parse integer: "{0}".'.format(value))
|
||
|
|
|
||
|
|
if isinstance(value, bool):
|
||
|
|
raise ParseError('Bool value {0} is not acceptable for '
|
||
|
|
'integer field.'.format(value))
|
||
|
|
|
||
|
|
return int(value)
|
||
|
|
|
||
|
|
|
||
|
|
def _ConvertFloat(value, field):
|
||
|
|
"""Convert an floating point number."""
|
||
|
|
if isinstance(value, float):
|
||
|
|
if math.isnan(value):
|
||
|
|
raise ParseError('Couldn\'t parse NaN, use quoted "NaN" instead.')
|
||
|
|
if math.isinf(value):
|
||
|
|
if value > 0:
|
||
|
|
raise ParseError('Couldn\'t parse Infinity or value too large, '
|
||
|
|
'use quoted "Infinity" instead.')
|
||
|
|
else:
|
||
|
|
raise ParseError('Couldn\'t parse -Infinity or value too small, '
|
||
|
|
'use quoted "-Infinity" instead.')
|
||
|
|
if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_FLOAT:
|
||
|
|
# pylint: disable=protected-access
|
||
|
|
if value > type_checkers._FLOAT_MAX:
|
||
|
|
raise ParseError('Float value too large')
|
||
|
|
# pylint: disable=protected-access
|
||
|
|
if value < type_checkers._FLOAT_MIN:
|
||
|
|
raise ParseError('Float value too small')
|
||
|
|
if value == 'nan':
|
||
|
|
raise ParseError('Couldn\'t parse float "nan", use "NaN" instead.')
|
||
|
|
try:
|
||
|
|
# Assume Python compatible syntax.
|
||
|
|
return float(value)
|
||
|
|
except ValueError:
|
||
|
|
# Check alternative spellings.
|
||
|
|
if value == _NEG_INFINITY:
|
||
|
|
return float('-inf')
|
||
|
|
elif value == _INFINITY:
|
||
|
|
return float('inf')
|
||
|
|
elif value == _NAN:
|
||
|
|
return float('nan')
|
||
|
|
else:
|
||
|
|
raise ParseError('Couldn\'t parse float: {0}.'.format(value))
|
||
|
|
|
||
|
|
|
||
|
|
def _ConvertBool(value, require_str):
|
||
|
|
"""Convert a boolean value.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
value: A scalar value to convert.
|
||
|
|
require_str: If True, value must be a str.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
The bool parsed.
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ParseError: If a boolean value couldn't be consumed.
|
||
|
|
"""
|
||
|
|
if require_str:
|
||
|
|
if value == 'true':
|
||
|
|
return True
|
||
|
|
elif value == 'false':
|
||
|
|
return False
|
||
|
|
else:
|
||
|
|
raise ParseError('Expected "true" or "false", not {0}.'.format(value))
|
||
|
|
|
||
|
|
if not isinstance(value, bool):
|
||
|
|
raise ParseError('Expected true or false without quotes.')
|
||
|
|
return value
|
||
|
|
|
||
|
|
_WKTJSONMETHODS = {
|
||
|
|
'google.protobuf.Any': ['_AnyMessageToJsonObject',
|
||
|
|
'_ConvertAnyMessage'],
|
||
|
|
'google.protobuf.Duration': ['_GenericMessageToJsonObject',
|
||
|
|
'_ConvertGenericMessage'],
|
||
|
|
'google.protobuf.FieldMask': ['_GenericMessageToJsonObject',
|
||
|
|
'_ConvertGenericMessage'],
|
||
|
|
'google.protobuf.ListValue': ['_ListValueMessageToJsonObject',
|
||
|
|
'_ConvertListValueMessage'],
|
||
|
|
'google.protobuf.Struct': ['_StructMessageToJsonObject',
|
||
|
|
'_ConvertStructMessage'],
|
||
|
|
'google.protobuf.Timestamp': ['_GenericMessageToJsonObject',
|
||
|
|
'_ConvertGenericMessage'],
|
||
|
|
'google.protobuf.Value': ['_ValueMessageToJsonObject',
|
||
|
|
'_ConvertValueMessage']
|
||
|
|
}
|