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146 lines
3.9 KiB
146 lines
3.9 KiB
"""Python bindings for 0MQ."""
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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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# load bundled libzmq, if there is one:
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import os
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import sys
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from contextlib import contextmanager
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def _load_libzmq():
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"""load bundled libzmq if there is one"""
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import platform
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dlopen = hasattr(sys, 'getdlopenflags') # unix-only
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# RTLD flags are added to os in Python 3
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# get values from os because ctypes values are WRONG on pypy
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PYPY = platform.python_implementation().lower() == 'pypy'
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if dlopen:
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import ctypes
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dlflags = sys.getdlopenflags()
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# set RTLD_GLOBAL, unset RTLD_LOCAL
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flags = ctypes.RTLD_GLOBAL | dlflags
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# ctypes.RTLD_LOCAL is 0 on pypy, which is *wrong*
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flags &= ~getattr(os, 'RTLD_LOCAL', 4)
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# pypy on darwin needs RTLD_LAZY for some reason
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if PYPY and sys.platform == 'darwin':
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flags |= getattr(os, 'RTLD_LAZY', 1)
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flags &= ~getattr(os, 'RTLD_NOW', 2)
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sys.setdlopenflags(flags)
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try:
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from . import libzmq
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except ImportError:
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# raise on failure to load if libzmq is present
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from importlib.util import find_spec
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if find_spec(".libzmq", "zmq"):
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# found libzmq, but failed to load it!
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# raise instead of silently moving on
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raise
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else:
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# store libzmq as zmq._libzmq for backward-compat
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globals()['_libzmq'] = libzmq
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if PYPY:
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# should already have been imported above, so reimporting is as cheap as checking
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import ctypes
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# some versions of pypy (5.3 < ? < 5.8) needs explicit CDLL load for some reason,
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# otherwise symbols won't be globally available
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# do this unconditionally because it should be harmless (?)
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ctypes.CDLL(libzmq.__file__, ctypes.RTLD_GLOBAL)
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finally:
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if dlopen:
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sys.setdlopenflags(dlflags)
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_load_libzmq()
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@contextmanager
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def _libs_on_path():
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"""context manager for libs directory on $PATH
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Works around mysterious issue where os.add_dll_directory
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does not resolve imports (conda-forge Python >= 3.8)
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"""
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if not sys.platform.startswith("win"):
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yield
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return
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libs_dir = os.path.abspath(
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os.path.join(
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os.path.dirname(__file__),
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os.pardir,
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"pyzmq.libs",
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)
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)
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if not os.path.exists(libs_dir):
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# no bundled libs
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yield
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return
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path_before = os.environ.get("PATH")
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try:
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os.environ["PATH"] = os.pathsep.join([path_before or "", libs_dir])
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yield
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finally:
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if path_before is None:
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os.environ.pop("PATH")
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else:
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os.environ["PATH"] = path_before
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# zmq top-level imports
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# workaround for Windows
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with _libs_on_path():
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from zmq import backend
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from . import constants # noqa
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from .constants import * # noqa
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from zmq.backend import * # noqa
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from zmq import sugar
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from zmq.sugar import * # noqa
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def get_includes():
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"""Return a list of directories to include for linking against pyzmq with cython."""
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from os.path import abspath, dirname, exists, join, pardir
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base = dirname(__file__)
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parent = abspath(join(base, pardir))
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includes = [parent] + [join(parent, base, subdir) for subdir in ('utils',)]
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if exists(join(parent, base, 'include')):
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includes.append(join(parent, base, 'include'))
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return includes
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def get_library_dirs():
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"""Return a list of directories used to link against pyzmq's bundled libzmq."""
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from os.path import abspath, dirname, join, pardir
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base = dirname(__file__)
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parent = abspath(join(base, pardir))
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return [join(parent, base)]
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COPY_THRESHOLD = 65536
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DRAFT_API = backend.has("draft")
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__all__ = (
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[
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'get_includes',
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'COPY_THRESHOLD',
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'DRAFT_API',
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]
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+ constants.__all__
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+ sugar.__all__
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+ backend.__all__
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)
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