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#!/usr/bin/python
# Copyright (C) 2011 Gluster, Inc. <http://www.gluster.com>
# This file is part of Gluster Management Gateway (GlusterMG).
#
# GlusterMG 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 3 of the License,
# or (at your option) any later version.
#
# GlusterMG 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, see
# <http://www.gnu.org/licenses/>.
#
import os
import sys
p1 = os.path.abspath(os.path.dirname(sys.argv[0]))
p2 = "%s/common" % os.path.dirname(p1)
if not p1 in sys.path:
sys.path.append(p1)
if not p2 in sys.path:
sys.path.append(p2)
import socket
import struct
import signal
import time
import Utils
import Globals
PID_FILE = "/var/run/multicast-discoverd.pid"
GLUSTERD_UUID = "NA"
def exitHandler(signum, frame):
try:
if os.path.exists(PID_FILE):
os.unlink(PID_FILE)
except OSError, e:
Utils.log("Failed to remove PID file %s: %s" % (PID_FILE, str(e)))
sys.exit(0)
def updateGlusterdUuid(signum, frame):
lines = Utils.readFile("/etc/glusterd/glusterd.info", lines=True)
for line in lines:
if line.strip().startswith("UUID="):
GLUSTERD_UUID = line.strip().split("=")[1]
return
GLUSTERD_UUID = "NA"
def isInPeer():
status = Utils.runCommand("gluster peer status", output=True)
if status["Status"] == 0:
if status["Stdout"].strip().upper() != "NO PEERS PRESENT":
return True
return False
def main():
if os.path.exists(PID_FILE):
sys.stderr.write("fatal: PID file %s exists\n" % PID_FILE)
sys.exit(-1)
if not Utils.daemonize():
sys.stderr.write("fatal: unable to run as daemon\n")
sys.exit(-1)
try:
fp = open(PID_FILE, "w")
fp.write("%s\n" % os.getpid())
fp.close()
except IOError, e:
Utils.log("failed to create PID file %s: %s" % (PID_FILE, str(e)))
sys.exit(1)
updateGlusterdUuid(None, None)
signal.signal(signal.SIGINT, exitHandler)
signal.signal(signal.SIGTERM, exitHandler)
signal.signal(signal.SIGHUP, exitHandler)
multicastSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
multicastSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
multicastSocket.bind(('', Globals.MULTICAST_PORT))
multicastSocket.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP,
struct.pack("4sl", socket.inet_aton(Globals.MULTICAST_GROUP),
socket.INADDR_ANY))
while True:
request = multicastSocket.recvfrom(Globals.DEFAULT_BUFSIZE)
if not request:
continue
#print "received [%s] from %s" % (request[0], request[1])
tokens = request[0].strip().split(",")
if len(tokens) != 3:
continue
if tokens[0] != Globals.GLUSTER_PROBE_STRING:
continue
if isInPeer():
continue
time.sleep(0.2)
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((request[1][0], Globals.SERVER_PORT))
sock.send("%s,%s,%s,%s,%s,%s\n" % (tokens[0], tokens[1], tokens[2], socket.gethostname(), socket.getfqdn(), GLUSTERD_UUID))
sock.close()
except socket.error, e:
Utils.log("failed to send reply to [%s:%s]: %s" % (request[1][0], Globals.SERVER_PORT, str(e)))
sys.exit(0)
if __name__ == "__main__":
main()
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