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#
# Copyright 2014 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# Refer to the README and COPYING files for full details of the license
#
import ctypes
from ctypes.util import find_library
import os
GLUSTER_VOL_PROTOCAL = 'tcp'
GLUSTER_VOL_HOST = 'localhost'
GLUSTER_VOL_PORT = 24007
GLUSTER_VOL_PATH = "/"
class GlusterLibgfapiException(Exception):
message = "Gluster Libgfapi Exception"
def __init__(self, rc=0, err=()):
self.rc = rc
self.err = err
def __str__(self):
s = self.message
if self.err:
e = '\n'.join(self.err)
s += '\nerror: ' + e
if self.rc:
s += '\nreturn code: %s' % self.rc
return s
class GlfsStatvfsException(GlusterLibgfapiException):
message = "Failed to get Gluster volume Size info"
class GlfsInitException(GlusterLibgfapiException):
message = "glfs init failed"
class GlfsFiniException(GlusterLibgfapiException):
message = "glfs fini failed"
class StatVfsStruct(ctypes.Structure):
_fields_ = [
('f_bsize', ctypes.c_ulong),
('f_frsize', ctypes.c_ulong),
('f_blocks', ctypes.c_ulong),
('f_bfree', ctypes.c_ulong),
('f_bavail', ctypes.c_ulong),
('f_files', ctypes.c_ulong),
('f_ffree', ctypes.c_ulong),
('f_favail', ctypes.c_ulong),
('f_fsid', ctypes.c_ulong),
('f_flag', ctypes.c_ulong),
('f_namemax', ctypes.c_ulong),
('__f_spare', ctypes.c_int * 6),
]
def glfsInit(volumeId, host, port, protocol):
fs = _glfs_new(volumeId)
rc = _glfs_set_volfile_server(fs,
protocol,
host,
port)
if rc != 0:
raise GlfsInitException(
rc=rc, err=["setting volfile server failed"]
)
rc = _glfs_init(fs)
if rc == 0:
return fs
elif rc == 1:
raise GlfsInitException(
rc=rc, err=["Volume:%s is stopped." % volumeId]
)
elif rc == -1:
raise GlfsInitException(
rc=rc, err=["Volume:%s not found." % volumeId]
)
else:
raise GlfsInitException(rc=rc, err=["unknown error."])
def glfsFini(fs, volumeId):
rc = _glfs_fini(fs)
if rc != 0:
raise GlfsFiniException(rc=rc)
def getVolumeStatvfs(volumeId, host=GLUSTER_VOL_HOST,
port=GLUSTER_VOL_PORT,
protocol=GLUSTER_VOL_PROTOCAL):
statvfsdata = StatVfsStruct()
fs = glfsInit(volumeId, host, port, protocol)
rc = _glfs_statvfs(fs, GLUSTER_VOL_PATH, ctypes.byref(statvfsdata))
if rc != 0:
raise GlfsStatvfsException(rc=rc)
glfsFini(fs, volumeId)
# To convert to os.statvfs_result we need to pass tuple/list in
# following order: bsize, frsize, blocks, bfree, bavail, files,
# ffree, favail, flag, namemax
return os.statvfs_result((statvfsdata.f_bsize,
statvfsdata.f_frsize,
statvfsdata.f_blocks,
statvfsdata.f_bfree,
statvfsdata.f_bavail,
statvfsdata.f_files,
statvfsdata.f_ffree,
statvfsdata.f_favail,
statvfsdata.f_flag,
statvfsdata.f_namemax))
# C function prototypes for using the library gfapi
_lib = ctypes.CDLL(find_library("gfapi"),
use_errno=True)
_glfs_new = ctypes.CFUNCTYPE(
ctypes.c_void_p, ctypes.c_char_p)(('glfs_new', _lib))
_glfs_set_volfile_server = ctypes.CFUNCTYPE(
ctypes.c_int,
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_char_p,
ctypes.c_int)(('glfs_set_volfile_server', _lib))
_glfs_init = ctypes.CFUNCTYPE(
ctypes.c_int, ctypes.c_void_p)(('glfs_init', _lib))
_glfs_fini = ctypes.CFUNCTYPE(
ctypes.c_int, ctypes.c_void_p)(('glfs_fini', _lib))
_glfs_statvfs = ctypes.CFUNCTYPE(ctypes.c_int,
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_void_p)(('glfs_statvfs', _lib))
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