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#!/usr/bin/python
# Copyright (C) 2010 Gluster, Inc. <http://www.gluster.com>
# This file is part of Gluster Storage Platform.
#
# Gluster Storage Platform 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.
#
# Gluster Storage Platform 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
import signal
import atexit
import socket
import syslog
import pwd
from optparse import OptionParser
import Globals
import Socket
import Utils
import ServerRequestHandler
ME = os.path.basename(sys.argv[0])
PID_FILE = "/var/run/serveragent.pid"
serverSocket = None
clientSocket = None
clientAddress = None
clientInputStream = None
clientOutputStream = None
def sigTermHandler(signal, frame):
sys.exit(0)
def cleanup():
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)))
try:
if clientSocket:
clientSocket.close()
except socket.error, e:
Utils.log("Failed to close client socket: %s" % str(e))
try:
if serverSocket:
serverSocket.close()
except socket.error, e:
Utils.log("Failed to close server socket: " % str(e))
def main():
global PID_FILE
global serverSocket
global clientSocket
global clientAddress
global clientInputStream
global clientOutputStream
username = Globals.SERVER_AGENT_RUN_USERNAME
Utils.openLog(Globals.SERVER_AGENT_LOG_FILE)
parser = OptionParser(version="%s %s" % (ME, Globals.GLUSTER_PLATFORM_VERSION))
parser.add_option("-N", "--no-daemon",
action="store_false", dest="daemonMode", default=True,
help="Run in foreground")
parser.add_option("-r", "--run-as", dest="username",
help="Run the daemon as USERNAME (default: %s)" % Globals.SERVER_AGENT_RUN_USERNAME,
metavar="USERNAME")
(options, args) = parser.parse_args()
if options.username:
username = options.username
try:
userInfo = pwd.getpwnam(username)
except KeyError, e:
sys.stderr.write("%s\n" % str(e))
serverSocket.close()
sys.exit(-1)
uid = userInfo.pw_uid
gid = userInfo.pw_gid
try:
Utils.log("__DEBUG__ Opening server socket on port %s" % Globals.SERVER_AGENT_PORT)
serverSocket = Socket.openServerSocket()
except socket.error, e:
sys.stderr.write("Failed to open server socket: %s\n" % str(e))
sys.exit(-1)
if options.daemonMode:
if os.path.exists(PID_FILE):
sys.stderr.write("fatal: %s file exists\n" % PID_FILE)
serverSocket.close()
sys.exit(-1)
if not Utils.daemonize():
sys.stderr.write("fatal: unable to run as daemon\n")
serverSocket.close()
sys.exit(-1)
try:
fp = open(PID_FILE, "w")
fp.write("%s\n" % os.getpid())
fp.close()
except IOError, e:
Utils.log("Pid file %s: %s" % (PID_FILE, str(e)))
serverSocket.close()
sys.exit(-1)
try:
os.chown(PID_FILE, uid, gid)
except OSError, e:
Utils.log("Pid file %s: %s" % (PID_FILE, str(e)))
serverSocket.close()
try:
os.unlink(PID_FILE)
except OSError, ex:
Utils.log("Failed to remove PID file %s: %s" % (PID_FILE, str(ex)))
sys.exit(-1)
else:
Globals.GLUSTER_DEBUG = True
try:
os.setregid(gid, gid)
except OSError, e:
Utils.log("Failed to set effective and real gid to %s: %s" % (gid, str(e)))
cleanup()
sys.exit(-1)
try:
os.setreuid(uid, uid)
except OSError, e:
Utils.log("Failed to set effective and real uid to %s: %s" % (uid, str(e)))
cleanup()
sys.exit(-1)
atexit.register(cleanup)
signal.signal(signal.SIGTERM, sigTermHandler)
while True:
Utils.log("__DEBUG__ Waiting for new connection on port %s" % Globals.SERVER_AGENT_PORT)
try:
clientSocket, clientAddress, clientInputStream, clientOutputStream = Socket.acceptClient(serverSocket)
except socket.error, e:
Utils.log("Failed to accept new connection: %s" % str(e))
sys.exit(-1)
Utils.log('__DEBUG__ Connected by %s' % str(clientAddress))
try:
requestString = Socket.readPacket(clientInputStream)
Utils.log('__DEBUG__ Received %s' % repr(requestString))
responseString = ServerRequestHandler.handleRequest(requestString)
if responseString:
Socket.writePacket(clientOutputStream, responseString)
clientOutputStream.flush()
else:
Utils.log('__DEBUG__ empty response string')
Utils.log('__DEBUG__ Closing client %s' % str(clientAddress))
clientSocket.close()
except socket.error, e:
Utils.log("Socket error on client: %s" % str(e))
sys.exit(0)
if __name__ == "__main__":
main()
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