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#!/usr/bin/env python
# Copyright (c) 2015 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 sys
from subprocess import PIPE, Popen
from errno import EEXIST, ENOENT
import xml.etree.cElementTree as etree
import logging
import os
from datetime import datetime
import urllib
ROOT_GFID = "00000000-0000-0000-0000-000000000001"
DEFAULT_CHANGELOG_INTERVAL = 15
ParseError = etree.ParseError if hasattr(etree, 'ParseError') else SyntaxError
cache_data = {}
def cache_output(func):
def wrapper(*args, **kwargs):
global cache_data
if cache_data.get(func.func_name, None) is None:
cache_data[func.func_name] = func(*args, **kwargs)
return cache_data[func.func_name]
return wrapper
def handle_rm_error(func, path, exc_info):
if exc_info[1].errno == ENOENT:
return
raise exc_info[1]
def find(path, callback_func=lambda x: True, filter_func=lambda x: True,
ignore_dirs=[], subdirs_crawl=True):
if path in ignore_dirs:
return
if filter_func(path):
callback_func(path)
for p in os.listdir(path):
full_path = os.path.join(path, p)
if os.path.isdir(full_path):
if subdirs_crawl:
find(full_path, callback_func, filter_func, ignore_dirs)
else:
if filter_func(full_path):
callback_func(full_path)
else:
if filter_func(full_path):
callback_func(full_path)
def output_write(f, path, prefix=".", encode=False):
if path == "":
return
if prefix != ".":
path = os.path.join(prefix, path)
if encode:
path = urllib.quote_plus(path)
f.write("%s\n" % path)
def human_time(ts):
return datetime.fromtimestamp(float(ts)).strftime("%Y-%m-%d %H:%M:%S")
def setup_logger(logger, path, debug=False):
if debug:
logger.setLevel(logging.DEBUG)
else:
logger.setLevel(logging.INFO)
# create the logging file handler
fh = logging.FileHandler(path)
formatter = logging.Formatter("[%(asctime)s] %(levelname)s "
"[%(module)s - %(lineno)s:%(funcName)s] "
"- %(message)s")
fh.setFormatter(formatter)
# add handler to logger object
logger.addHandler(fh)
def create_file(path, exit_on_err=False, logger=None):
"""
If file exists overwrite. Print error to stderr and exit
if exit_on_err is set, else raise the exception. Consumer
should handle the exception.
"""
try:
open(path, 'w').close()
except (OSError, IOError) as e:
if exit_on_err:
fail("Failed to create file %s: %s" % (path, e), logger=logger)
else:
raise
def mkdirp(path, exit_on_err=False, logger=None):
"""
Try creating required directory structure
ignore EEXIST and raise exception for rest of the errors.
Print error in stderr and exit if exit_on_err is set, else
raise exception.
"""
try:
os.makedirs(path)
except (OSError, IOError) as e:
if e.errno == EEXIST and os.path.isdir(path):
pass
else:
if exit_on_err:
fail("Fail to create dir %s: %s" % (path, e), logger=logger)
else:
raise
def fail(msg, code=1, logger=None):
"""
Write error to stderr and exit
"""
if logger:
logger.error(msg)
sys.stderr.write("%s\n" % msg)
sys.exit(code)
def execute(cmd, exit_msg=None, logger=None):
"""
If failure_msg is not None then return returncode, out and error.
If failure msg is set, write to stderr and exit.
"""
p = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE, close_fds=True)
(out, err) = p.communicate()
if p.returncode != 0 and exit_msg is not None:
fail("%s: %s" % (exit_msg, err), p.returncode, logger=logger)
return (p.returncode, out, err)
def symlink_gfid_to_path(brick, gfid):
"""
Each directories are symlinked to file named GFID
in .glusterfs directory of brick backend. Using readlink
we get PARGFID/basename of dir. readlink recursively till
we get PARGFID as ROOT_GFID.
"""
if gfid == ROOT_GFID:
return ""
out_path = ""
while True:
path = os.path.join(brick, ".glusterfs", gfid[0:2], gfid[2:4], gfid)
path_readlink = os.readlink(path)
pgfid = os.path.dirname(path_readlink)
out_path = os.path.join(os.path.basename(path_readlink), out_path)
if pgfid == "../../00/00/%s" % ROOT_GFID:
break
gfid = os.path.basename(pgfid)
return out_path
@cache_output
def get_my_uuid():
cmd = ["gluster", "system::", "uuid", "get", "--xml"]
rc, out, err = execute(cmd)
if rc != 0:
return None
tree = etree.fromstring(out)
uuid_el = tree.find("uuidGenerate/uuid")
return uuid_el.text
def is_host_local(host_uuid):
# Get UUID only if it is not done previously
# else Cache the UUID value
my_uuid = get_my_uuid()
if my_uuid == host_uuid:
return True
return False
def get_changelog_rollover_time(volumename):
cmd = ["gluster", "volume", "get", volumename,
"changelog.rollover-time", "--xml"]
rc, out, err = execute(cmd)
if rc != 0:
return DEFAULT_CHANGELOG_INTERVAL
try:
tree = etree.fromstring(out)
return int(tree.find('volGetopts/Value').text)
except ParseError:
return DEFAULT_CHANGELOG_INTERVAL
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