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89 lines
3.6 KiB
89 lines
3.6 KiB
# 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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