#!/usr/bin/python3
# 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
#
#%# capabilities=autoconf
#%# family=contrib

from __future__ import print_function
import re, sys, os
import libvirt

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

def print_config(uri, stack):
    """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
total_pc.type DERIVE
total_pc.graph no
total_pc.min 0
total_pc.max 100
total_pc.label total
total_pc.info cputime used by all virtual machines
total_pc.warning 90
total_pc.critical 95""")

    draw = [ "LINE1", "AREA"][stack]
    conn = libvirt.openReadOnly(uri)
    ids = conn.listDomainsID()
    for id in ids:
        try:
            dom = conn.lookupByID(id)
            name = dom.name()
        except libvirt.libvirtError as err:
            print("Id: %s: %s" % (id, err), file=sys.stderr)
            continue
        if name == "Domain-0":
            continue
        print("%s_cputime.label %s" % (canon(name), name))
        print("%s_cputime.type DERIVE" % canon(name))
        print("%s_cputime.min 0" % canon(name))
        print("%s_cputime.draw %s" % (canon(name), draw))
        print("%s_cputime.info percent of cputime used by virtual machine '%s'" % (canon(name), name))
        if draw == "AREA":
            draw = "STACK"

def fetch_values(uri):
    conn = libvirt.openReadOnly(uri)
    ids = conn.listDomainsID()
    total = 0

    processors = float(conn.getInfo()[2])
    for id in ids:
        try:
            dom = conn.lookupByID(id)
            name = dom.name()
        except libvirt.libvirtError as err:
            print("Id: %s: %s" % (id, err), file=sys.stderr)
            continue
        if name == "Domain-0":
            continue
        cputime = float(dom.info()[4])
        cputime_percentage = 1.0e-7 * cputime / processors
        total += cputime_percentage
        print("%s_cputime.value %.0f" % (canon(name), cputime_percentage))
    print("total_pc.value %.0f" % total)


def main(sys):
    uri = os.getenv("uri", "qemu:///system")
    stack = [ False, True ][os.getenv("stack") == "1"]

    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, stack)
            return 0
    fetch_values(uri)
    return 0

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

# vim:et:ts=4:sw=4: