112 lines
4.5 KiB
Python
112 lines
4.5 KiB
Python
# Protocol Buffers - Google's data interchange format
|
|
# Copyright 2008 Google Inc. All rights reserved.
|
|
# https://developers.google.com/protocol-buffers/
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met:
|
|
#
|
|
# * Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# * 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.
|
|
# * Neither the name of Google Inc. nor the names of its
|
|
# contributors may be used to endorse or promote products derived from
|
|
# this software without specific prior written permission.
|
|
#
|
|
# 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.
|
|
|
|
"""Determine which implementation of the protobuf API is used in this process.
|
|
"""
|
|
|
|
import os
|
|
import sys
|
|
import warnings
|
|
|
|
try:
|
|
# pylint: disable=g-import-not-at-top
|
|
from google.protobuf.internal import _api_implementation
|
|
# The compile-time constants in the _api_implementation module can be used to
|
|
# switch to a certain implementation of the Python API at build time.
|
|
_api_version = _api_implementation.api_version
|
|
except ImportError:
|
|
_api_version = -1 # Unspecified by compiler flags.
|
|
|
|
if _api_version == 1:
|
|
raise ValueError('api_version=1 is no longer supported.')
|
|
|
|
|
|
_default_implementation_type = ('cpp' if _api_version > 0 else 'python')
|
|
|
|
|
|
# This environment variable can be used to switch to a certain implementation
|
|
# of the Python API, overriding the compile-time constants in the
|
|
# _api_implementation module. Right now only 'python' and 'cpp' are valid
|
|
# values. Any other value will be ignored.
|
|
_implementation_type = os.getenv('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION',
|
|
_default_implementation_type)
|
|
|
|
if _implementation_type != 'python':
|
|
_implementation_type = 'cpp'
|
|
|
|
if 'PyPy' in sys.version and _implementation_type == 'cpp':
|
|
warnings.warn('PyPy does not work yet with cpp protocol buffers. '
|
|
'Falling back to the python implementation.')
|
|
_implementation_type = 'python'
|
|
|
|
|
|
# Detect if serialization should be deterministic by default
|
|
try:
|
|
# The presence of this module in a build allows the proto implementation to
|
|
# be upgraded merely via build deps.
|
|
#
|
|
# NOTE: Merely importing this automatically enables deterministic proto
|
|
# serialization for C++ code, but we still need to export it as a boolean so
|
|
# that we can do the same for `_implementation_type == 'python'`.
|
|
#
|
|
# NOTE2: It is possible for C++ code to enable deterministic serialization by
|
|
# default _without_ affecting Python code, if the C++ implementation is not in
|
|
# use by this module. That is intended behavior, so we don't actually expose
|
|
# this boolean outside of this module.
|
|
#
|
|
# pylint: disable=g-import-not-at-top,unused-import
|
|
from google.protobuf import enable_deterministic_proto_serialization
|
|
_python_deterministic_proto_serialization = True
|
|
except ImportError:
|
|
_python_deterministic_proto_serialization = False
|
|
|
|
|
|
# Usage of this function is discouraged. Clients shouldn't care which
|
|
# implementation of the API is in use. Note that there is no guarantee
|
|
# that differences between APIs will be maintained.
|
|
# Please don't use this function if possible.
|
|
def Type():
|
|
return _implementation_type
|
|
|
|
|
|
def _SetType(implementation_type):
|
|
"""Never use! Only for protobuf benchmark."""
|
|
global _implementation_type
|
|
_implementation_type = implementation_type
|
|
|
|
|
|
# See comment on 'Type' above.
|
|
def Version():
|
|
return 2
|
|
|
|
|
|
# For internal use only
|
|
def IsPythonDefaultSerializationDeterministic():
|
|
return _python_deterministic_proto_serialization
|