#!/usr/bin/python
# mclu (mini cluster)
# Copyright (C) 2014 Red Hat Inc.
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import argparse
import os
import sys
import time
import subprocess

import ansible.inventory
import ansible.runner

import config
import lib

def cmdline (subparsers):
    p = subparsers.add_parser (
        'on',
        help='power on a node (or nodes)'
    )
    p.add_argument (
        'wildcard',
        help='node name(s) to be woken up (wildcard may be used)'
    )
    p.set_defaults (run=run)

def run (c, args):
    inventory = ansible.inventory.Inventory ()
    inventory.subset (subset_pattern = args.wildcard)
    nodes = inventory.get_hosts (c['nodes_group'])

    # Wake them up.
    for node in nodes:
        vars = node.get_variables()
        if 'mac' in vars:
            devnull = open (os.devnull, "w")
            subprocess.check_call ([config.WOL, vars['mac']],
                                   stdout = devnull, stderr = devnull)
        else:
            print "warning: no mac= line in ansible hosts file for %s (ignored)" % node.name

    # Wait for them to come up.
    pings = 30
    runner = ansible.runner.Runner (
        remote_user = 'root',
        module_name = 'ping',
        inventory = inventory,
        pattern = c['nodes_group'],
    )
    while pings > 0:
        data = runner.run ()
        if len (data['dark']) == 0:
            break
        pings -= 1
        time.sleep (1)

    if pings == 0:
        sys.exit ('warning: some nodes did not wake up')