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| 1 # Protocol Buffers - Google's data interchange format |
| 2 # Copyright 2008 Google Inc. All rights reserved. |
| 3 # http://code.google.com/p/protobuf/ |
| 4 # |
| 5 # Redistribution and use in source and binary forms, with or without |
| 6 # modification, are permitted provided that the following conditions are |
| 7 # met: |
| 8 # |
| 9 # * Redistributions of source code must retain the above copyright |
| 10 # notice, this list of conditions and the following disclaimer. |
| 11 # * Redistributions in binary form must reproduce the above |
| 12 # copyright notice, this list of conditions and the following disclaimer |
| 13 # in the documentation and/or other materials provided with the |
| 14 # distribution. |
| 15 # * Neither the name of Google Inc. nor the names of its |
| 16 # contributors may be used to endorse or promote products derived from |
| 17 # this software without specific prior written permission. |
| 18 # |
| 19 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 20 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 21 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 22 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 23 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 24 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 25 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 26 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 27 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 28 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 29 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 |
| 31 """Determine which implementation of the protobuf API is used in this process. |
| 32 """ |
| 33 |
| 34 import os |
| 35 import sys |
| 36 |
| 37 try: |
| 38 # pylint: disable=g-import-not-at-top |
| 39 from google.protobuf.internal import _api_implementation |
| 40 # The compile-time constants in the _api_implementation module can be used to |
| 41 # switch to a certain implementation of the Python API at build time. |
| 42 _api_version = _api_implementation.api_version |
| 43 del _api_implementation |
| 44 except ImportError: |
| 45 _api_version = 0 |
| 46 |
| 47 _default_implementation_type = ( |
| 48 'python' if _api_version == 0 else 'cpp') |
| 49 _default_version_str = ( |
| 50 '1' if _api_version <= 1 else '2') |
| 51 |
| 52 # This environment variable can be used to switch to a certain implementation |
| 53 # of the Python API, overriding the compile-time constants in the |
| 54 # _api_implementation module. Right now only 'python' and 'cpp' are valid |
| 55 # values. Any other value will be ignored. |
| 56 _implementation_type = os.getenv('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION', |
| 57 _default_implementation_type) |
| 58 |
| 59 if _implementation_type != 'python': |
| 60 _implementation_type = 'cpp' |
| 61 |
| 62 # This environment variable can be used to switch between the two |
| 63 # 'cpp' implementations, overriding the compile-time constants in the |
| 64 # _api_implementation module. Right now only 1 and 2 are valid values. Any other |
| 65 # value will be ignored. |
| 66 _implementation_version_str = os.getenv( |
| 67 'PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION', |
| 68 _default_version_str) |
| 69 |
| 70 if _implementation_version_str not in ('1', '2'): |
| 71 raise ValueError( |
| 72 "unsupported PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION: '" + |
| 73 _implementation_version_str + "' (supported versions: 1, 2)" |
| 74 ) |
| 75 |
| 76 _implementation_version = int(_implementation_version_str) |
| 77 |
| 78 |
| 79 # Usage of this function is discouraged. Clients shouldn't care which |
| 80 # implementation of the API is in use. Note that there is no guarantee |
| 81 # that differences between APIs will be maintained. |
| 82 # Please don't use this function if possible. |
| 83 def Type(): |
| 84 return _implementation_type |
| 85 |
| 86 |
| 87 # See comment on 'Type' above. |
| 88 def Version(): |
| 89 return _implementation_version |
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