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45 lines
1.3 KiB
45 lines
1.3 KiB
"""Import basic exposure of libzmq C API as a backend"""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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import os
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import platform
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import sys
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from .select import public_api, select_backend
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if 'PYZMQ_BACKEND' in os.environ:
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backend = os.environ['PYZMQ_BACKEND']
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if backend in ('cython', 'cffi'):
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backend = 'zmq.backend.%s' % backend
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_ns = select_backend(backend)
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else:
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# default to cython, fallback to cffi
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# (reverse on PyPy)
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if platform.python_implementation() == 'PyPy':
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first, second = ('zmq.backend.cffi', 'zmq.backend.cython')
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else:
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first, second = ('zmq.backend.cython', 'zmq.backend.cffi')
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try:
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_ns = select_backend(first)
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except Exception:
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exc_info = sys.exc_info()
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exc = exc_info[1]
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try:
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_ns = select_backend(second)
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except ImportError:
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# prevent 'During handling of the above exception...' on py3
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# can't use `raise ... from` on Python 2
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if hasattr(exc, '__cause__'):
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exc.__cause__ = None
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# raise the *first* error, not the fallback
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from zmq.utils.sixcerpt import reraise
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reraise(*exc_info)
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globals().update(_ns)
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__all__ = public_api
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