61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
#
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# Copyright 2015 ClusterHQ
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""
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The package that contains a module per each C library that
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`libzfs_core` uses. The modules expose CFFI objects required
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to make calls to functions in the libraries.
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"""
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from __future__ import absolute_import, division, print_function
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import threading
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import importlib
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from cffi import FFI
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def _setup_cffi():
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class LazyLibrary(object):
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def __init__(self, ffi, libname):
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self._ffi = ffi
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self._libname = libname
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self._lib = None
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self._lock = threading.Lock()
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def __getattr__(self, name):
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if self._lib is None:
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with self._lock:
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if self._lib is None:
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self._lib = self._ffi.dlopen(self._libname)
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return getattr(self._lib, name)
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MODULES = ["libnvpair", "libzfs_core"]
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ffi = FFI()
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for module_name in MODULES:
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module = importlib.import_module("." + module_name, __name__)
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ffi.cdef(module.CDEF)
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lib = LazyLibrary(ffi, module.LIBRARY)
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setattr(module, "ffi", ffi)
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setattr(module, "lib", lib)
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_setup_cffi()
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# vim: softtabstop=4 tabstop=4 expandtab shiftwidth=4
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