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generate.py
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generate.py
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from cffi import FFI
import os
try:
import ConfigParser as cfgparser
except ImportError:
# try py3 import
import configparser as cfgparser
SITE_CFG = 'site.cfg'
DEFAULT_INCLUDE_DIRS = ['/usr/include/nanomsg', '/usr/local/include/nanomsg']
DEFAULT_HOST_LIBRARY = 'nanomsg'
BLOCKS = {'{': '}', '(': ')'}
DEFINITIONS = '''
struct nn_pollfd {
int fd;
short events;
short revents;
};
'''
def header_files(include_paths):
for dir in include_paths:
if os.path.exists(dir):
break
return {fn: os.path.join(dir, fn) for fn in os.listdir(dir)
if fn.endswith('.h')}
def functions(hfiles):
lines = []
for fn, path in hfiles.items():
with open(path) as f:
cont = ''
for ln in f:
if cont == ',':
lines.append(ln)
cont = ''
if cont in BLOCKS:
lines.append(ln)
if BLOCKS[cont] in ln:
cont = ''
if not (ln.startswith('NN_EXPORT')
or ln.startswith('typedef')):
continue
lines.append(ln)
cont = ln.strip()[-1]
return ''.join(ln[10:] if ln.startswith('NN_') else ln for ln in lines)
def symbols(ffi, host_library):
nanomsg = ffi.dlopen(host_library)
lines = []
for i in range(1024):
val = ffi.new('int*')
name = nanomsg.nn_symbol(i, val)
if name == ffi.NULL:
break
name = ffi.string(name).decode()
name = name[3:] if name.startswith('NN_') else name
lines.append('%s = %s' % (name, val[0]))
return '\n'.join(lines) + '\n'
def create_module():
# Set defaults
set_source_args = {
'include_dirs': DEFAULT_INCLUDE_DIRS
}
host_library = DEFAULT_HOST_LIBRARY
# Read overrides for cross-compilation support from site.cfg
if os.path.isfile(SITE_CFG):
parser = cfgparser.ConfigParser()
if parser.read(SITE_CFG):
parsed_cfg = parser.defaults()
for param in ['include_dirs', 'library_dirs']:
if param in parsed_cfg:
set_source_args[param] = parsed_cfg[param].split(',')
if 'host_library' in parsed_cfg:
host_library = parsed_cfg['host_library']
# Add some more directories from the environment
if 'CPATH' in os.environ:
cpaths = os.getenv('CPATH').split(os.pathsep)
set_source_args['include_dirs'] += [os.path.join(p, 'nanomsg')
for p in cpaths]
hfiles = header_files(set_source_args['include_dirs'])
# remove ws.h due to https://github.com/nanomsg/nanomsg/issues/467
hfiles.pop('ws.h', None)
# Build FFI module and write out the constants
ffi = FFI()
ffi.cdef(DEFINITIONS)
ffi.cdef(functions(hfiles))
ffi.set_source('_nnpy', '\n'.join('#include <%s>' % fn for fn in hfiles),
libraries=['nanomsg'], **set_source_args)
with open('nnpy/constants.py', 'w') as f:
f.write(symbols(ffi, host_library))
return ffi
ffi = create_module()
if __name__ == '__main__':
ffi.compile()