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#
# Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
# This file is part of GlusterFS.
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
#
import os
from ctypes import CDLL, create_string_buffer, get_errno, byref, c_ulong
from ctypes.util import find_library
from syncdutils import ChangelogException
class Changes(object):
libgfc = CDLL(find_library("gfchangelog"), use_errno=True)
@classmethod
def geterrno(cls):
return get_errno()
@classmethod
def raise_changelog_err(cls):
errn = cls.geterrno()
raise ChangelogException(errn, os.strerror(errn))
@classmethod
def _get_api(cls, call):
return getattr(cls.libgfc, call)
@classmethod
def cl_register(cls, brick, path, log_file, log_level, retries=0):
ret = cls._get_api('gf_changelog_register')(brick, path,
log_file,
log_level, retries)
if ret == -1:
cls.raise_changelog_err()
@classmethod
def cl_scan(cls):
ret = cls._get_api('gf_changelog_scan')()
if ret == -1:
cls.raise_changelog_err()
@classmethod
def cl_startfresh(cls):
ret = cls._get_api('gf_changelog_start_fresh')()
if ret == -1:
cls.raise_changelog_err()
@classmethod
def cl_getchanges(cls):
""" remove hardcoding for path name length """
def clsort(f):
return f.split('.')[-1]
changes = []
buf = create_string_buffer('\0', 4096)
call = cls._get_api('gf_changelog_next_change')
while True:
ret = call(buf, 4096)
if ret in (0, -1):
break
changes.append(buf.raw[:ret - 1])
if ret == -1:
cls.raise_changelog_err()
# cleanup tracker
cls.cl_startfresh()
return sorted(changes, key=clsort)
@classmethod
def cl_done(cls, clfile):
ret = cls._get_api('gf_changelog_done')(clfile)
if ret == -1:
cls.raise_changelog_err()
@classmethod
def cl_history_scan(cls):
ret = cls._get_api('gf_history_changelog_scan')()
if ret == -1:
cls.raise_changelog_err()
return ret
@classmethod
def cl_history_changelog(cls, changelog_path, start, end, num_parallel):
actual_end = c_ulong()
ret = cls._get_api('gf_history_changelog')(changelog_path, start, end,
num_parallel,
byref(actual_end))
if ret == -1:
cls.raise_changelog_err()
return (ret, actual_end.value)
@classmethod
def cl_history_startfresh(cls):
ret = cls._get_api('gf_history_changelog_start_fresh')()
if ret == -1:
cls.raise_changelog_err()
@classmethod
def cl_history_getchanges(cls):
""" remove hardcoding for path name length """
def clsort(f):
return f.split('.')[-1]
changes = []
buf = create_string_buffer('\0', 4096)
call = cls._get_api('gf_history_changelog_next_change')
while True:
ret = call(buf, 4096)
if ret in (0, -1):
break
changes.append(buf.raw[:ret - 1])
if ret == -1:
cls.raise_changelog_err()
return sorted(changes, key=clsort)
@classmethod
def cl_history_done(cls, clfile):
ret = cls._get_api('gf_history_changelog_done')(clfile)
if ret == -1:
cls.raise_changelog_err()
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