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# 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
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
_proto_extension_modules_exist_in_build = True
except ImportError:
_api_version = -1 # Unspecified by compiler flags.
_proto_extension_modules_exist_in_build = False
if _api_version == 1:
raise ValueError('api_version=1 is no longer supported.')
if _api_version < 0: # Still unspecified?
try:
# The presence of this module in a build allows the proto implementation to
# be upgraded merely via build deps rather than a compiler flag or the
# runtime environment variable.
# pylint: disable=g-import-not-at-top
from google.protobuf import _use_fast_cpp_protos
# Work around a known issue in the classic bootstrap .par import hook.
if not _use_fast_cpp_protos:
raise ImportError('_use_fast_cpp_protos import succeeded but was None')
del _use_fast_cpp_protos
_api_version = 2
except ImportError:
if _proto_extension_modules_exist_in_build:
if sys.version_info[0] >= 3: # Python 3 defaults to C++ impl v2.
_api_version = 2
# TODO(b/17427486): Make Python 2 default to C++ impl v2.
_default_implementation_type = (
'python' if _api_version <= 0 else 'cpp')
# 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'
# This environment variable can be used to switch between the two
# 'cpp' implementations, overriding the compile-time constants in the
# _api_implementation module. Right now only '2' is supported. Any other
# value will cause an error to be raised.
_implementation_version_str = os.getenv(
'PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION', '2')
if _implementation_version_str != '2':
raise ValueError(
'unsupported PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION: "' +
_implementation_version_str + '" (supported versions: 2)'
)
_implementation_version = int(_implementation_version_str)
# 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
# See comment on 'Type' above.
def Version():
return _implementation_version
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