def select_backend(name):
"""Select the pyzmq backend"""
try:
mod = __import__(name, fromlist=public_api)
except ImportError:
raise
except Exception as e:
import sys
from zmq.utils.sixcerpt import reraise
exc_info = sys.exc_info()
reraise(ImportError, ImportError("Importing %s failed with %s" % (name, e)), exc_info[2])
ns = {}
for key in public_api:
ns[key] = getattr(mod, key)
return ns
def select_backend(name):
"""Select the pyzmq backend"""
try:
mod = __import__(name, fromlist=public_api)
except ImportError:
raise
except Exception as e:
import sys
from zmq.utils.sixcerpt import reraise
exc_info = sys.exc_info()
reraise(ImportError,
ImportError("Importing %s failed with %s" % (name, e)),
exc_info[2])
ns = {}
for key in public_api:
ns[key] = getattr(mod, key)
return ns
from zmq.utils.sixcerpt import reraise
from .select import public_api, select_backend
if "PYZMQ_BACKEND" in os.environ:
backend = os.environ["PYZMQ_BACKEND"]
if backend in ("cython", "cffi"):
backend = "zmq.backend.%s" % backend
_ns = select_backend(backend)
else:
# default to cython, fallback to cffi
# (reverse on PyPy)
if platform.python_implementation() == "PyPy":
first, second = ("zmq.backend.cffi", "zmq.backend.cython")
else:
first, second = ("zmq.backend.cython", "zmq.backend.cffi")
try:
_ns = select_backend(first)
except Exception:
exc_info = sys.exc_info()
try:
_ns = select_backend(second)
except ImportError:
# raise the *first* error, not the fallback
reraise(*exc_info)
globals().update(_ns)
__all__ = public_api
if backend in ('cython', 'cffi'):
backend = 'zmq.backend.%s' % backend
_ns = select_backend(backend)
else:
# default to cython, fallback to cffi
# (reverse on PyPy)
if platform.python_implementation() == 'PyPy':
first, second = ('zmq.backend.cffi', 'zmq.backend.cython')
else:
first, second = ('zmq.backend.cython', 'zmq.backend.cffi')
try:
_ns = select_backend(first)
except Exception:
exc_info = sys.exc_info()
exc = exc_info[1]
try:
_ns = select_backend(second)
except ImportError:
# prevent 'During handling of the above exception...' on py3
# can't use `raise ... from` on Python 2
if hasattr(exc, '__cause__'):
exc.__cause__ = None
# raise the *first* error, not the fallback
from zmq.utils.sixcerpt import reraise
reraise(*exc_info)
globals().update(_ns)
__all__ = public_api
