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# coding: utf-8
"""The main CFFI wrapping of libzmq"""
# Copyright (C) PyZMQ Developers
# Distributed under the terms of the Modified BSD License.
import json
import os
from os.path import dirname, join
from cffi import FFI
from zmq.utils.constant_names import all_names, no_prefix
ffi = FFI()
base_zmq_version = (3,2,2)
core_functions = \
'''
void* zmq_socket(void *context, int type);
int zmq_close(void *socket);
int zmq_bind(void *socket, const char *endpoint);
int zmq_connect(void *socket, const char *endpoint);
int zmq_errno(void);
const char * zmq_strerror(int errnum);
void* zmq_stopwatch_start(void);
unsigned long zmq_stopwatch_stop(void *watch);
void zmq_sleep(int seconds_);
int zmq_device(int device, void *frontend, void *backend);
'''
core32_functions = \
'''
int zmq_unbind(void *socket, const char *endpoint);
int zmq_disconnect(void *socket, const char *endpoint);
void* zmq_ctx_new();
int zmq_ctx_destroy(void *context);
int zmq_ctx_get(void *context, int opt);
int zmq_ctx_set(void *context, int opt, int optval);
int zmq_proxy(void *frontend, void *backend, void *capture);
int zmq_socket_monitor(void *socket, const char *addr, int events);
'''
core40_functions = \
'''
int zmq_curve_keypair (char *z85_public_key, char *z85_secret_key);
'''
message32_functions = \
'''
typedef struct { ...; } zmq_msg_t;
typedef ... zmq_free_fn;
int zmq_msg_init(zmq_msg_t *msg);
int zmq_msg_init_size(zmq_msg_t *msg, size_t size);
int zmq_msg_init_data(zmq_msg_t *msg,
void *data,
size_t size,
zmq_free_fn *ffn,
void *hint);
size_t zmq_msg_size(zmq_msg_t *msg);
void *zmq_msg_data(zmq_msg_t *msg);
int zmq_msg_close(zmq_msg_t *msg);
int zmq_msg_send(zmq_msg_t *msg, void *socket, int flags);
int zmq_msg_recv(zmq_msg_t *msg, void *socket, int flags);
'''
sockopt_functions = \
'''
int zmq_getsockopt(void *socket,
int option_name,
void *option_value,
size_t *option_len);
int zmq_setsockopt(void *socket,
int option_name,
const void *option_value,
size_t option_len);
'''
polling_functions = \
'''
typedef struct
{
void *socket;
int fd;
short events;
short revents;
} zmq_pollitem_t;
int zmq_poll(zmq_pollitem_t *items, int nitems, long timeout);
'''
extra_functions = \
'''
void * memcpy(void *restrict s1, const void *restrict s2, size_t n);
int get_ipc_path_max_len(void);
'''
def load_compiler_config():
import zmq
zmq_dir = dirname(zmq.__file__)
zmq_parent = dirname(zmq_dir)
fname = join(zmq_dir, 'utils', 'compiler.json')
if os.path.exists(fname):
with open(fname) as f:
cfg = json.load(f)
else:
cfg = {}
cfg.setdefault("include_dirs", [])
cfg.setdefault("library_dirs", [])
cfg.setdefault("runtime_library_dirs", [])
cfg.setdefault("libraries", ["zmq"])
# cast to str, because cffi can't handle unicode paths (?!)
cfg['libraries'] = [str(lib) for lib in cfg['libraries']]
for key in ("include_dirs", "library_dirs", "runtime_library_dirs"):
# interpret paths relative to parent of zmq (like source tree)
abs_paths = []
for p in cfg[key]:
if p.startswith('zmq'):
p = join(zmq_parent, p)
abs_paths.append(str(p))
cfg[key] = abs_paths
return cfg
cfg = load_compiler_config()
def zmq_version_info():
ffi_check = FFI()
ffi_check.cdef('void zmq_version(int *major, int *minor, int *patch);')
cfg = load_compiler_config()
C_check_version = ffi_check.verify('#include <zmq.h>',
libraries=cfg['libraries'],
include_dirs=cfg['include_dirs'],
library_dirs=cfg['library_dirs'],
runtime_library_dirs=cfg['runtime_library_dirs'],
)
major = ffi.new('int*')
minor = ffi.new('int*')
patch = ffi.new('int*')
C_check_version.zmq_version(major, minor, patch)
return (int(major[0]), int(minor[0]), int(patch[0]))
def _make_defines(names):
_names = []
for name in names:
define_line = "#define %s ..." % (name)
_names.append(define_line)
return "\n".join(_names)
c_constant_names = []
for name in all_names:
if no_prefix(name):
c_constant_names.append(name)
else:
c_constant_names.append("ZMQ_" + name)
constants = _make_defines(c_constant_names)
try:
_version_info = zmq_version_info()
except Exception as e:
raise ImportError("PyZMQ CFFI backend couldn't find zeromq: %s\n"
"Please check that you have zeromq headers and libraries." % e)
if _version_info >= (3,2,2):
functions = '\n'.join([constants,
core_functions,
core32_functions,
core40_functions,
message32_functions,
sockopt_functions,
polling_functions,
extra_functions,
])
else:
raise ImportError("PyZMQ CFFI backend requires zeromq >= 3.2.2,"
" but found %i.%i.%i" % _version_info
)
ffi.cdef(functions)
C = ffi.verify('''
#include <stdio.h>
#include <sys/un.h>
#include <string.h>
#include <zmq.h>
#include <zmq_utils.h>
#include "zmq_compat.h"
int get_ipc_path_max_len(void) {
struct sockaddr_un *dummy;
return sizeof(dummy->sun_path) - 1;
}
''',
libraries=cfg['libraries'],
include_dirs=cfg['include_dirs'],
library_dirs=cfg['library_dirs'],
runtime_library_dirs=cfg['runtime_library_dirs'],
)
nsp = new_sizet_pointer = lambda length: ffi.new('size_t*', length)
new_uint64_pointer = lambda: (ffi.new('uint64_t*'),
nsp(ffi.sizeof('uint64_t')))
new_int64_pointer = lambda: (ffi.new('int64_t*'),
nsp(ffi.sizeof('int64_t')))
new_int_pointer = lambda: (ffi.new('int*'),
nsp(ffi.sizeof('int')))
new_binary_data = lambda length: (ffi.new('char[%d]' % (length)),
nsp(ffi.sizeof('char') * length))
value_uint64_pointer = lambda val : (ffi.new('uint64_t*', val),
ffi.sizeof('uint64_t'))
value_int64_pointer = lambda val: (ffi.new('int64_t*', val),
ffi.sizeof('int64_t'))
value_int_pointer = lambda val: (ffi.new('int*', val),
ffi.sizeof('int'))
value_binary_data = lambda val, length: (ffi.new('char[%d]' % (length + 1), val),
ffi.sizeof('char') * length)
IPC_PATH_MAX_LEN = C.get_ipc_path_max_len()
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