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#!/usr/bin/python
#    fence_cdu - fence agent for a Sentry Switch CDU.
#
#    Copyright (C) 2012 Canonical Ltd.
#
#    Authors: Andres Rodriguez <andres.rodriguez@canonical.com>
#
#    This program 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, version 3 of the License.
#
#    This program 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/>.

#####
##
## The Following Agent Has Been Tested On:
##
##  Model                Firmware
## +---------------------------------------------+
## Sentry Switched CDU   6a
##
## @note: ssh has not being tested
##
#####

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

def get_power_status(conn, options):
    exp_result = 0
    outlets = {}
    try:
        conn.send("STATUS\r\n")
        conn.log_expect(options, options["-c"], int(options["-Y"]))
        lines = conn.before.split("\n")
        #    .A12     TowerA_Outlet12           On         Idle On  
        #    .A12     test-01                   On         Idle On  
        show_re = re.compile('(\.\w+)\s+(\w+|\w+\W\w+)\s+(On|Off)\s+(On|Idle On|Off|Wake On)')
        for line in lines:
            res = show_re.search(line)
            if res != None:
                outlets[res.group(2)] = (res.group(1), res.group(3))
    except pexpect.EOF:
        fail(EC_CONNECTION_LOST)
    except pexpect.TIMEOUT:
        fail(EC_TIMED_OUT)
    try:
        (_, status) = outlets[options["-n"]]
        return status.lower().strip()
    except KeyError:
        fail(EC_STATUS)

def set_power_status(conn, options):
        outlets = {}
	action = {
		'on' : "on",
		'off': "off"
	}[options["-o"]]
	try:
            conn.send("LIST OUTLETS\r\n")
            conn.log_expect(options, options["-c"], int(options["-Y"]))
            lines = conn.before.split("\n")
            #    .A12     TowerA_Outlet12
            #    .A12     test-01
            show_re = re.compile('(\.\w+)\s+(\w+|\w+\W\w+)\s+')
            for line in lines:
                res = show_re.search(line)
                if res != None:
                    outlets[res.group(2)] = (res.group(1))
            conn.send(action + " " + outlets[options["-n"]] + "\r\n")
            conn.log_expect(options, options["-c"], int(options["-Y"]))
	except pexpect.EOF:
		fail(EC_CONNECTION_LOST)
	except pexpect.TIMEOUT:
		fail(EC_TIMED_OUT)

def main():
	device_opt = [  "help", "version", "agent", "quiet", "verbose", "debug",
			"action", "ipaddr", "login", "passwd", "passwd_script",
			"secure", "port", "identity_file", "switch", "test", "separator",
			"inet4_only", "inet6_only", "ipport",
			"power_timeout", "shell_timeout", "login_timeout", "power_wait" ]

	atexit.register(atexit_handler)

	options = check_input(device_opt, process_input(device_opt))

	## 
	## Fence agent specific defaults
	#####
	options["ssh_options"] = "-1 -c blowfish"

	if 0 == options.has_key("-c"):
		options["-c"] = "Switched CDU:"

	docs = { }
	docs["shortdesc"] = "Fence agent for a Sentry Switch CDU over telnet/ssh"
	docs["longdesc"] = "fence_cdu is an I/O Fencing agent \
which can be used with the Sentry Switch CDU. It logs into the device \
via telnet/ssh and power's on/off an outlet."
	docs["vendorurl"] = "http://www.servertech.com"
	show_docs(options, docs)

	## Support for -n [switch]:[plug] notation that was used before
	if (options.has_key("-n") == 1) and (-1 != options["-n"].find(":")):
		(switch, plug) = options["-n"].split(":", 1)
		options["-s"] = switch;
		options["-n"] = plug;

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

	##
	## Logout from system
	##
	## In some special unspecified cases it is possible that 
	## connection will be closed before we run close(). This is not 
	## a problem because everything is checked before.
	######
	try:
		conn.sendline("LOGOUT")
		conn.close()
	except exceptions.OSError:
		pass
	except pexpect.ExceptionPexpect:
		pass
	
	sys.exit(result)

if __name__ == "__main__":
	main()