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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, ValueError, AttributeError) as ex: # If we have a TypeError, ValueError or AttributeError, # try the slow path in case the error # was: # - an int64/string issue. # - a missing key issue in case a key only exists with a `_` suffix. # See related issue: https://github.com/googleapis/python-api-core/issues/227. # - a missing key issue due to nested struct. See: https://github.com/googleapis/proto-plus-python/issues/424. # - a missing key issue due to nested duration. See: https://github.com/googleapis/google-cloud-python/issues/13350. 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
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