glusterfs

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#!/usr/bin/python3
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from __future__ import print_function
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import ctypes
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import ctypes.util
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api = ctypes.CDLL("libgfapi.so")
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api.glfs_get_volfile.argtypes = [ctypes.c_void_p,
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                                 ctypes.c_void_p,
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                                 ctypes.c_ulong]
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api.glfs_get_volfile.restype = ctypes.c_long
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def get_volfile(host, volume):
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    # This is set to a large value to exercise the "buffer not big enough"
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    # path.  More realistically, you'd just start with a huge buffer.
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    BUF_LEN = 0
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    fs = api.glfs_new(volume)
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    # api.glfs_set_logging(fs,"/dev/stderr",7)
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    api.glfs_set_volfile_server(fs, "tcp", host, 24007)
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    api.glfs_init(fs)
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    vbuf = ctypes.create_string_buffer(BUF_LEN)
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    vlen = api.glfs_get_volfile(fs, vbuf, BUF_LEN)
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    if vlen < 0:
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        vlen = BUF_LEN - vlen
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        vbuf = ctypes.create_string_buffer(vlen)
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        vlen = api.glfs_get_volfile(fs, vbuf, vlen)
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    api.glfs_fini(fs)
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    if vlen <= 0:
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        return vlen
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    return vbuf.value[:vlen]
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if __name__ == "__main__":
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    import sys
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    try:
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        res = get_volfile(*sys.argv[1:3])
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    except:
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        print("fetching volfile failed (volume not started?)")
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    try:
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        for line in res.split('\n'):
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            print(line)
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    except:
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        print("bad return value %s" % res)
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