add virt module for libvirt interaction/support
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Seth Vidal
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437
virt
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437
virt
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#!/usr/bin/python
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"""
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Virt management features
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Copyright 2007, 2012 Red Hat, Inc
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Michael DeHaan <mdehaan@redhat.com>
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Seth Vidal <skvidal@fedoraproject.org>
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This software may be freely redistributed under the terms of the GNU
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general public license.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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"""
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VIRT_FAILED = 1
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VIRT_SUCCESS = 0
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VIRT_UNAVAILABLE=2
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try:
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import json
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except ImportError:
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import simplejson as json
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# other modules
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import os
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import sys
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import subprocess
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try:
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import libvirt
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except ImportError:
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print json.dumps({
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"failed" : True,
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"msg" : "libvirt python module unavailable",
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"rc": VIRT_UNAVAILABLE,
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})
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sys.exit(1)
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import shlex
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VIRT_STATE_NAME_MAP = {
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0 : "running",
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1 : "running",
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2 : "running",
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3 : "paused",
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4 : "shutdown",
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5 : "shutdown",
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6 : "crashed"
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}
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class LibvirtConnection(object):
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def __init__(self):
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cmd = subprocess.Popen("uname -r", shell=True, stdout=subprocess.PIPE,
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close_fds=True)
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output = cmd.communicate()[0]
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if output.find("xen") != -1:
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conn = libvirt.open(None)
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else:
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conn = libvirt.open("qemu:///system")
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if not conn:
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raise Exception("hypervisor connection failure")
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self.conn = conn
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def find_vm(self, vmid):
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"""
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Extra bonus feature: vmid = -1 returns a list of everything
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"""
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conn = self.conn
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vms = []
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# this block of code borrowed from virt-manager:
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# get working domain's name
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ids = conn.listDomainsID()
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for id in ids:
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vm = conn.lookupByID(id)
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vms.append(vm)
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# get defined domain
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names = conn.listDefinedDomains()
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for name in names:
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vm = conn.lookupByName(name)
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vms.append(vm)
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if vmid == -1:
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return vms
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for vm in vms:
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if vm.name() == vmid:
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return vm
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raise Exception("virtual machine %s not found" % vmid)
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def shutdown(self, vmid):
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return self.find_vm(vmid).shutdown()
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def pause(self, vmid):
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return self.suspend(self.conn,vmid)
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def unpause(self, vmid):
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return self.resume(self.conn,vmid)
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def suspend(self, vmid):
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return self.find_vm(vmid).suspend()
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def resume(self, vmid):
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return self.find_vm(vmid).resume()
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def create(self, vmid):
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return self.find_vm(vmid).create()
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def destroy(self, vmid):
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return self.find_vm(vmid).destroy()
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def undefine(self, vmid):
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return self.find_vm(vmid).undefine()
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def get_status2(self, vm):
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state = vm.info()[0]
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# print "DEBUG: state: %s" % state
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return VIRT_STATE_NAME_MAP.get(state,"unknown")
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def get_status(self, vmid):
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state = self.find_vm(vmid).info()[0]
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return VIRT_STATE_NAME_MAP.get(state,"unknown")
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def nodeinfo(self):
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return self.conn.getInfo()
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def get_type(self):
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return self.conn.getType()
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def get_maxVcpus(self, vmid):
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vm = self.conn.lookupByName(vmid)
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return vm.maxVcpus()
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def get_maxMemory(self, vmid):
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vm = self.conn.lookupByName(vmid)
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return vm.maxMemory()
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def getFreeMemory(self):
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return self.conn.getFreeMemory()
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def get_autostart(self, vmid):
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vm = self.conn.lookupByName(vmid)
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return vm.autostart()
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def set_autostart(self, vmid, val):
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vm = self.conn.lookupByName(vmid)
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return vm.setAutostart(val)
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class Virt(object):
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def __get_conn(self):
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self.conn = LibvirtConnection()
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return self.conn
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def get_vm(self, vmid):
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self.__get_conn()
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return self.conn.find_vm(vmid)
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def state(self):
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vms = self.list_vms()
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state = []
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for vm in vms:
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state_blurb = self.conn.get_status(vm)
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state.append("%s %s" % (vm,state_blurb))
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return state
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def info(self):
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vms = self.list_vms()
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info = dict()
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for vm in vms:
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data = self.conn.find_vm(vm).info()
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# libvirt returns maxMem, memory, and cpuTime as long()'s, which
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# xmlrpclib tries to convert to regular int's during serialization.
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# This throws exceptions, so convert them to strings here and
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# assume the other end of the xmlrpc connection can figure things
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# out or doesn't care.
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info[vm] = {
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"state" : VIRT_STATE_NAME_MAP.get(data[0],"unknown"),
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"maxMem" : str(data[1]),
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"memory" : str(data[2]),
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"nrVirtCpu" : data[3],
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"cpuTime" : str(data[4]),
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}
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thisvm = self.conn.find_vm(vm)
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if hasattr(thisvm, 'autostart'):
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info[vm]["autostart"] = thisvm.autostart()
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return info
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def nodeinfo(self):
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self.__get_conn()
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info = dict()
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data = self.conn.nodeinfo()
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info = {
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"cpumodel" : str(data[0]),
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"phymemory" : str(data[1]),
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"cpus" : str(data[2]),
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"cpumhz" : str(data[3]),
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"numanodes" : str(data[4]),
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"sockets" : str(data[5]),
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"cpucores" : str(data[6]),
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"cputhreads" : str(data[7])
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}
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return info
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def list_vms(self):
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self.conn = self.__get_conn()
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vms = self.conn.find_vm(-1)
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results = []
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for x in vms:
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try:
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results.append(x.name())
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except:
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pass
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return results
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def virttype(self):
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return self.__get_conn().get_type()
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def autostart(self, vmid):
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self.conn = self.__get_conn()
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return self.conn.set_autostart(vmid, True)
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def freemem(self):
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self.conn = self.__get_conn()
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return self.conn.getFreeMemory()
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def shutdown(self, vmid):
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"""
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Make the machine with the given vmid stop running.
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Whatever that takes.
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"""
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self.__get_conn()
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self.conn.shutdown(vmid)
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return 0
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def pause(self, vmid):
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"""
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Pause the machine with the given vmid.
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"""
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self.__get_conn()
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return self.conn.suspend(vmid)
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def unpause(self, vmid):
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"""
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Unpause the machine with the given vmid.
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"""
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self.__get_conn()
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return self.conn.resume(vmid)
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def create(self, vmid):
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"""
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Start the machine via the given mac address.
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"""
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self.__get_conn()
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return self.conn.create(vmid)
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def start(self, vmid):
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"""
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Start the machine via the given id/name
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"""
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self.__get_conn()
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return self.conn.create(vmid)
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def destroy(self, vmid):
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"""
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Pull the virtual power from the virtual domain, giving it virtually no
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time to virtually shut down.
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"""
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self.__get_conn()
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return self.conn.destroy(vmid)
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def undefine(self, vmid):
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"""
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Stop a domain, and then wipe it from the face of the earth.
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by deleting the disk image and it's configuration file.
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"""
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self.__get_conn()
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return self.conn.undefine(vmid)
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def status(self, vmid):
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"""
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Return a state suitable for server consumption. Aka, codes.py values, not XM output.
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"""
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self.__get_conn()
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return self.conn.get_status(vmid)
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def get_xml(self, vmid):
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"""
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Recieve a Vm id as input
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Return an xml describing vm config returned by a libvirt call
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"""
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conn = libvirt.openReadOnly(None)
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if conn == None:
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return (-1,'Failed to open connection to the hypervisor')
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try:
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domV = conn.lookupByName(vmid)
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except:
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return (-1,'Failed to find the main domain')
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return domV.XMLDesc(0)
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def get_maxVcpus(self, vmid):
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"""
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Gets the max number of VCPUs on a guest
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"""
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self.__get_conn()
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return self.conn.get_maxVcpus(vmid)
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def get_max_memory(self, vmid):
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"""
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Gets the max memory on a guest
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"""
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self.__get_conn()
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return self.conn.get_MaxMemory(vmid)
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def main():
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rc = VIRT_SUCCESS
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vm_commands = ['create','status', 'start', 'stop', 'pause', 'unpause',
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'shutdown', 'undefine', 'destroy', 'get_xml', 'autostart']
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host_commands = ['freemem', 'list_vms', 'info', 'nodeinfo', 'virttype']
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msg = """
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virtmodule arguments:
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- queryvm guest <queryable item from libvirt domain api> <more of those>
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- guest commands: (all require a single guest name an argument)
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%s
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- host commands:
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%s
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""" % (', '.join(sorted(vm_commands)), ', '.join(sorted(host_commands)))
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if len(sys.argv) == 1:
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return VIRT_FAILED, msg
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argfile = sys.argv[1]
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if not os.path.exists(argfile):
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msg = "Argument file not found"
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return VIRT_FAILED, msg
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args = open(argfile, 'r').read()
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items = shlex.split(args)
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if not len(items):
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return VIRT_FAILED, msg
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basecmd = items[0]
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v = Virt()
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if basecmd in ('queryvm'):
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if len(items) < 3:
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msg = "queryvm requires at least 2 arguments: guest itemname [itemname]"
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return VIRT_FAILED, msg
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guest = items[1]
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reqs = items[2:]
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res = {}
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for req in reqs:
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vm = v.get_vm(guest)
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if hasattr(vm, req):
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data = getattr(vm,req)()
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res[req] = data
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return rc, res
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# any methods that require the guest/vmid as the argument must be listed here
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elif basecmd in vm_commands:
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if len(items) < 2:
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msg = "%s requires 1 argument: guest" % basecmd
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return VIRT_FAILED, msg
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guest = items[1]
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res = getattr(v, basecmd)(guest)
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if type(res) != dict:
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res = { basecmd: res }
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return rc, res
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elif hasattr(v, basecmd):
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res = getattr(v, basecmd)()
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return rc, res
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else:
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msg = "Command %s not recognized" % basecmd
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rc = VIRT_FAILED
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return rc, msg
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if __name__ == "__main__":
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try:
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rc, result = main()
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except Exception, e:
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rc = 1
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result = str(e)
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if rc != 0: # something went wrong emit the msg
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print json.dumps({
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"failed" : rc,
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"msg" : result,
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"rc": rc,
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})
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sys.exit(rc)
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else:
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print json.dumps(result)
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