#!/usr/bin/python

# The Following Agent Has Been Tested On:
#
# Virsh 0.3.3 on RHEL 5.2 with xen-3.0.3-51
#

import sys, re, pexpect, exceptions
sys.path.append("/usr/share/fence")
from fencing import *

#BEGIN_VERSION_GENERATION
RELEASE_VERSION="4.0.2"
BUILD_DATE="(built Fri May 30 06:22:39 UTC 2014)"
REDHAT_COPYRIGHT="Copyright (C) Red Hat, Inc. 2004-2010 All rights reserved."
#END_VERSION_GENERATION

def get_outlets_status(conn, options):
	if options.has_key("--use-sudo"):
		prefix = SUDO_PATH + " "
	else:
		prefix = ""

	conn.sendline(prefix + "virsh list --all")
	conn.log_expect(options, options["--command-prompt"], int(options["--shell-timeout"]))

	result = {}

        #This is status of mini finite automata. 0 = we didn't found Id and Name, 1 = we did
	fa_status = 0

	for line in conn.before.splitlines():
		domain = re.search("^\s*(\S+)\s+(\S+)\s+(\S+).*$", line)

		if (domain!=None):
			if ((fa_status==0) and (domain.group(1).lower()=="id") and (domain.group(2).lower()=="name")):
				fa_status = 1
			elif (fa_status==1):
				result[domain.group(2)] = ("", (domain.group(3).lower() in ["running", "blocked", "idle", "no state", "paused"] and "on" or "off"))
	return result

def get_power_status(conn, options):
	outlets = get_outlets_status(conn, options)

	if (not (options["--plug"] in outlets)):
		fail_usage("Failed: You have to enter existing name of virtual machine!")
	else:
		return outlets[options["--plug"]][1]

def set_power_status(conn, options):
	if options.has_key("--use-sudo"):
		prefix = SUDO_PATH + " "
	else:
		prefix = ""

	conn.sendline(prefix + "virsh %s "%(options["--action"] == "on" and "start" or "destroy")+options["--plug"])

	conn.log_expect(options, options["--command-prompt"], int(options["--power-timeout"]))
	time.sleep(int(options["--power-wait"]))

def main():
	device_opt = [ "ipaddr", "login", "passwd", "cmd_prompt", "secure", "port", "sudo" ]

	atexit.register(atexit_handler)

	all_opt["secure"]["default"] = "1"
	all_opt["cmd_prompt"]["default"] = [ "\[EXPECT\]#\ " ]
	all_opt["ssh_options"]["default"] = "-t '/bin/bash -c \"PS1=\[EXPECT\]#\  /bin/bash --noprofile --norc\"'"

	options = check_input(device_opt, process_input(device_opt))

	docs = { }
	docs["shortdesc"] = "Fence agent for virsh"
	docs["longdesc"] = "fence_virsh is an I/O Fencing agent \
which can be used with the virtual machines managed by libvirt. \
It logs via ssh to a dom0 and there run virsh command, which does \
all work. \
\n.P\n\
By default, virsh needs root account to do properly work. So you \
must allow ssh login in your sshd_config."
	docs["vendorurl"] = "http://libvirt.org"
	show_docs(options, docs)

	## Operate the fencing device
	conn = fence_login(options)
	result = fence_action(conn, options, set_power_status, get_power_status, get_outlets_status)

	## Logout from system
	try:
		conn.sendline("quit")
		conn.close()
	except:
		pass

	sys.exit(result)
if __name__ == "__main__":
	main()
