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# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
class MessageRule:
"""A marshal for converting between a descriptor and proto.Message."""
def __init__(self, descriptor: type, wrapper: type):
self._descriptor = descriptor
self._wrapper = wrapper
def to_python(self, value, *, absent: bool = None):
if isinstance(value, self._descriptor):
return self._wrapper.wrap(value)
return value
def to_proto(self, value):
if isinstance(value, self._wrapper):
return self._wrapper.pb(value)
if isinstance(value, dict) and not self.is_map:
# We need to use the wrapper's marshaling to handle
# potentially problematic nested messages.
try:
# Try the fast path first.
return self._descriptor(**value)
except TypeError as ex:
# If we have a type error,
# try the slow path in case the error
# was an int64/string issue
return self._wrapper(value)._pb
return value
@property
def is_map(self):
"""Return True if the descriptor is a map entry, False otherwise."""
desc = self._descriptor.DESCRIPTOR
return desc.has_options and desc.GetOptions().map_entry