128 lines
3.8 KiB
Python
128 lines
3.8 KiB
Python
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# coding: utf-8
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"""The main CFFI wrapping of libzmq"""
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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 json
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import os
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from os.path import dirname, join
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from cffi import FFI
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from zmq.utils.constant_names import all_names, no_prefix
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base_zmq_version = (3,2,2)
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def load_compiler_config():
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"""load pyzmq compiler arguments"""
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import zmq
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zmq_dir = dirname(zmq.__file__)
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zmq_parent = dirname(zmq_dir)
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fname = join(zmq_dir, 'utils', 'compiler.json')
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if os.path.exists(fname):
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with open(fname) as f:
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cfg = json.load(f)
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else:
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cfg = {}
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cfg.setdefault("include_dirs", [])
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cfg.setdefault("library_dirs", [])
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cfg.setdefault("runtime_library_dirs", [])
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cfg.setdefault("libraries", ["zmq"])
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# cast to str, because cffi can't handle unicode paths (?!)
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cfg['libraries'] = [str(lib) for lib in cfg['libraries']]
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for key in ("include_dirs", "library_dirs", "runtime_library_dirs"):
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# interpret paths relative to parent of zmq (like source tree)
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abs_paths = []
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for p in cfg[key]:
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if p.startswith('zmq'):
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p = join(zmq_parent, p)
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abs_paths.append(str(p))
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cfg[key] = abs_paths
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return cfg
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def zmq_version_info():
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"""Get libzmq version as tuple of ints"""
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major = ffi.new('int*')
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minor = ffi.new('int*')
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patch = ffi.new('int*')
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C.zmq_version(major, minor, patch)
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return (int(major[0]), int(minor[0]), int(patch[0]))
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cfg = load_compiler_config()
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ffi = FFI()
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def _make_defines(names):
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_names = []
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for name in names:
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define_line = "#define %s ..." % (name)
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_names.append(define_line)
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return "\n".join(_names)
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c_constant_names = ['PYZMQ_DRAFT_API']
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for name in all_names:
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if no_prefix(name):
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c_constant_names.append(name)
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else:
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c_constant_names.append("ZMQ_" + name)
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# load ffi definitions
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here = os.path.dirname(__file__)
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with open(os.path.join(here, '_cdefs.h')) as f:
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_cdefs = f.read()
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with open(os.path.join(here, '_verify.c')) as f:
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_verify = f.read()
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ffi.cdef(_cdefs)
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ffi.cdef(_make_defines(c_constant_names))
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try:
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C = ffi.verify(_verify,
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modulename='_cffi_ext',
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libraries=cfg['libraries'],
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include_dirs=cfg['include_dirs'],
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library_dirs=cfg['library_dirs'],
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runtime_library_dirs=cfg['runtime_library_dirs'],
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)
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_version_info = zmq_version_info()
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except Exception as e:
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raise ImportError("PyZMQ CFFI backend couldn't find zeromq: %s\n"
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"Please check that you have zeromq headers and libraries." % e)
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if _version_info < (3,2,2):
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raise ImportError("PyZMQ CFFI backend requires zeromq >= 3.2.2,"
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" but found %i.%i.%i" % _version_info
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)
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nsp = new_sizet_pointer = lambda length: ffi.new('size_t*', length)
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new_uint64_pointer = lambda: (ffi.new('uint64_t*'),
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nsp(ffi.sizeof('uint64_t')))
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new_int64_pointer = lambda: (ffi.new('int64_t*'),
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nsp(ffi.sizeof('int64_t')))
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new_int_pointer = lambda: (ffi.new('int*'),
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nsp(ffi.sizeof('int')))
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new_binary_data = lambda length: (ffi.new('char[%d]' % (length)),
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nsp(ffi.sizeof('char') * length))
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value_uint64_pointer = lambda val : (ffi.new('uint64_t*', val),
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ffi.sizeof('uint64_t'))
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value_int64_pointer = lambda val: (ffi.new('int64_t*', val),
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ffi.sizeof('int64_t'))
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value_int_pointer = lambda val: (ffi.new('int*', val),
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ffi.sizeof('int'))
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value_binary_data = lambda val, length: (ffi.new('char[%d]' % (length + 1), val),
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ffi.sizeof('char') * length)
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IPC_PATH_MAX_LEN = C.get_ipc_path_max_len()
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