#!/usr/bin/python
# vim: set fileencoding=utf-8 :
#
# Munin plugin to show the percent of cputime of libvirt managed virtual
# machines
# 
# Copyright 2008 Guido Guenther <agx@sigxcpu.org>
#
# License: GPLv2
#
# depends: python-libvirt
#
# If you don't want to use the default uri use:
# 
# [libvirt-*]
# env.uri qemu:///system
#
# in your plugin configuration

import re, sys, os
import libvirt

def canon(name):
    return re.sub(r"[^a-zA-Z0-9_]", "_", name)

def print_config(uri):
    """print the plugin config, determine the domains"""

    print """graph_title Virtual Domain Cpu Time
graph_vlabel CPU Time percentage
graph_category Virtual Machines
graph_info This graph shows the cpu time percentage of each virtual machine
graph_args --base 1000 -l 0"""

    conn = libvirt.openReadOnly(uri)
    ids = conn.listDomainsID()
    for id in ids:
        dom = conn.lookupByID(id)
        name = dom.name()
        print "%s_cputime.label %s" % (canon(name), name)
        print "%s_cputime.type DERIVE" % canon(name)
        print "%s_cputime.min 0" % canon(name)


def fetch_values(uri):
    conn = libvirt.openReadOnly(uri)
    ids = conn.listDomainsID()

    processors = float(conn.getInfo()[2])
    for id in ids:
        dom = conn.lookupByID(id)
        name = dom.name()
        cputime = float(dom.info()[4])
        cputime_percentage = 1.0e-7 * cputime / processors
        print "%s_cputime.value %.0f" % (canon(name), cputime_percentage)


def main(sys):
    uri = os.getenv("uri")

    if len(sys) > 1:
        if sys[1] in [ 'autoconf', 'detect' ]:
            if libvirt.openReadOnly(uri):
                print "yes"
                return 0
            else:
                print "no"
                return 1
        elif sys[1] == 'config':
            print_config(uri)
            return 0
    fetch_values(uri)
    return 0

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

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