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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.
from __future__ import print_function
import subprocess
import os
import os.path
import sys
import time
import logging
import logging.handlers
import fcntl
GCRON_TASKS = "/var/run/gluster/shared_storage/snaps/glusterfs_snap_cron_tasks"
GCRON_CROND_TASK = "/etc/cron.d/glusterfs_snap_cron_tasks"
GCRON_RELOAD_FLAG = "/var/run/gluster/crond_task_reload_flag"
LOCK_FILE_DIR = "/var/run/gluster/shared_storage/snaps/lock_files/"
log = logging.getLogger("gcron-logger")
start_time = 0.0
def initLogger(script_name):
log.setLevel(logging.DEBUG)
logFormat = "[%(asctime)s %(filename)s:%(lineno)s %(funcName)s] "\
"%(levelname)s %(message)s"
formatter = logging.Formatter(logFormat)
sh = logging.handlers.SysLogHandler()
sh.setLevel(logging.ERROR)
sh.setFormatter(formatter)
process = subprocess.Popen(["gluster", "--print-logdir"],
stdout=subprocess.PIPE)
out, err = process.communicate()
if process.returncode == 0:
logfile = os.path.join(out.strip(), script_name[:-3]+".log")
fh = logging.FileHandler(logfile)
fh.setLevel(logging.DEBUG)
fh.setFormatter(formatter)
log.addHandler(sh)
log.addHandler(fh)
def takeSnap(volname="", snapname=""):
success = True
if volname == "":
log.debug("No volname given")
return False
if snapname == "":
log.debug("No snapname given")
return False
cli = ["gluster",
"snapshot",
"create",
snapname,
volname]
log.debug("Running command '%s'", " ".join(cli))
p = subprocess.Popen(cli, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = p.communicate()
rv = p.returncode
log.debug("Command '%s' returned '%d'", " ".join(cli), rv)
if rv:
log.error("Snapshot of %s failed", volname)
log.error("Command output:")
log.error(err)
success = False
else:
log.info("Snapshot of %s successful", volname)
return success
def doJob(name, lockFile, jobFunc, volname):
success = True
try:
f = os.open(lockFile, os.O_RDWR | os.O_NONBLOCK)
try:
fcntl.flock(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
mtime = os.path.getmtime(lockFile)
global start_time
log.debug("%s last modified at %s", lockFile, time.ctime(mtime))
if mtime < start_time:
log.debug("Processing job %s", name)
if jobFunc(volname, name):
log.info("Job %s succeeded", name)
else:
log.error("Job %s failed", name)
success = False
os.utime(lockFile, None)
else:
log.info("Job %s has been processed already", name)
fcntl.flock(f, fcntl.LOCK_UN)
except IOError as (errno, strerror):
log.info("Job %s is being processed by another agent", name)
os.close(f)
except IOError as (errno, strerror):
log.debug("Failed to open lock file %s : %s", lockFile, strerror)
log.error("Failed to process job %s", name)
success = False
return success
def main():
script_name = os.path.basename(__file__)
initLogger(script_name)
global start_time
if sys.argv[1] == "--update":
if not os.path.exists(GCRON_TASKS):
# Create a flag in /var/run/gluster which indicates that this nodes
# doesn't have access to GCRON_TASKS right now, so that
# when the mount is available and GCRON_TASKS is available
# the flag will tell this routine to reload GCRON_CROND_TASK
try:
f = os.open(GCRON_RELOAD_FLAG, os.O_CREAT | os.O_NONBLOCK, 0644)
os.close(f)
except OSError as (errno, strerror):
if errno != EEXIST:
log.error("Failed to create %s : %s",
GCRON_RELOAD_FLAG, strerror)
output("Failed to create %s. Error: %s"
% (GCRON_RELOAD_FLAG, strerror))
return
if not os.path.exists(GCRON_CROND_TASK):
return
# As GCRON_TASKS exists now, we should check if GCRON_RELOAD_FLAG
# also exists. If so we should touch GCRON_CROND_TASK and remove
# the GCRON_RELOAD_FLAG
if os.path.exists(GCRON_RELOAD_FLAG):
try:
os.remove(GCRON_RELOAD_FLAG);
process = subprocess.Popen(["touch", "-h", GCRON_CROND_TASK],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = process.communicate()
if process.returncode != 0:
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, err)
except (IOError, OSError) as (errno, strerror):
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, strerror)
return
if os.lstat(GCRON_TASKS).st_mtime > \
os.lstat(GCRON_CROND_TASK).st_mtime:
try:
process = subprocess.Popen(["touch", "-h", GCRON_CROND_TASK],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = process.communicate()
if process.returncode != 0:
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, err)
except IOError as (errno, strerror):
log.error("Failed to touch %s. Error: %s.",
GCRON_CROND_TASK, strerror)
return
volname = sys.argv[1]
jobname = sys.argv[2]
locking_file = os.path.join(LOCK_FILE_DIR, jobname)
log.debug("locking_file = %s", locking_file)
log.debug("volname = %s", volname)
log.debug("jobname = %s", jobname)
start_time = int(time.time())
doJob("Scheduled-" + jobname + "-" + volname, locking_file, takeSnap, volname)
if __name__ == "__main__":
main()
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