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90 lines
3.6 KiB
90 lines
3.6 KiB
4 years ago
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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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"""Determine which implementation of the protobuf API is used in this process.
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"""
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import os
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import sys
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try:
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# pylint: disable=g-import-not-at-top
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from google.protobuf.internal import _api_implementation
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# The compile-time constants in the _api_implementation module can be used to
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# switch to a certain implementation of the Python API at build time.
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_api_version = _api_implementation.api_version
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del _api_implementation
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except ImportError:
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_api_version = 0
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_default_implementation_type = (
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'python' if _api_version == 0 else 'cpp')
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_default_version_str = (
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'1' if _api_version <= 1 else '2')
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# This environment variable can be used to switch to a certain implementation
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# of the Python API, overriding the compile-time constants in the
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# _api_implementation module. Right now only 'python' and 'cpp' are valid
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# values. Any other value will be ignored.
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_implementation_type = os.getenv('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION',
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_default_implementation_type)
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if _implementation_type != 'python':
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_implementation_type = 'cpp'
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# This environment variable can be used to switch between the two
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# 'cpp' implementations, overriding the compile-time constants in the
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# _api_implementation module. Right now only 1 and 2 are valid values. Any other
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# value will be ignored.
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_implementation_version_str = os.getenv(
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'PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION',
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_default_version_str)
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if _implementation_version_str not in ('1', '2'):
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raise ValueError(
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"unsupported PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION: '" +
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_implementation_version_str + "' (supported versions: 1, 2)"
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)
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_implementation_version = int(_implementation_version_str)
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# Usage of this function is discouraged. Clients shouldn't care which
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# implementation of the API is in use. Note that there is no guarantee
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# that differences between APIs will be maintained.
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# Please don't use this function if possible.
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def Type():
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return _implementation_type
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# See comment on 'Type' above.
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def Version():
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return _implementation_version
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