_fast_uuid.py 文件源码

def __init__(self):
        # Store these on the class since they should only ever be called once
        if _LibUUID._ffi is None or _LibUUID._libuuid is None:
            _LibUUID._ffi = FFI()

            # These definitions are from uuid.h
            _LibUUID._ffi.cdef("""
                typedef unsigned char uuid_t[16];

                void uuid_generate(uuid_t out);
                void uuid_generate_random(uuid_t out);
                void uuid_generate_time(uuid_t out);
            """)

            # By opening the library with dlopen, the compile step is skipped
            # dodging a class of errors, since headers aren't needed, just the
            # installed library.
            _LibUUID._libuuid = _LibUUID._ffi.dlopen(
                ctypes.util.find_library("uuid")
            )

            get_config().logger.debug(
                "FastUUID Created - FFI: ({}), LIBUUID: ({})".format(
                    _LibUUID._ffi,
                    _LibUUID._libuuid
                )
            )

        # Keeping only one copy of this around does result in
        # pretty substantial performance improvements - in the 10,000s of
        # messages per second range
        self.output = _LibUUID._ffi.new("uuid_t")