/**
* Abiquo community edition
* cloud management application for hybrid clouds
* Copyright (C) 2008-2010 - Abiquo Holdings S.L.
*
* This application is free software; you can redistribute it and/or
* modify it under the terms of the GNU LESSER GENERAL PUBLIC
* LICENSE as published by the Free Software Foundation under
* version 3 of the License
*
* This software 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
* LESSER GENERAL PUBLIC LICENSE v.3 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
package com.abiquo.vsm.monitor.libvirt;
import java.net.MalformedURLException;
import java.net.URL;
import org.libvirt.Connect;
import org.libvirt.Domain;
import org.libvirt.LibvirtException;
import org.libvirt.DomainInfo.DomainState;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.abiquo.vsm.events.VMEvent;
import com.abiquo.vsm.events.VMEventType;
import com.abiquo.vsm.exception.MonitorException;
import com.abiquo.vsm.model.PhysicalMachine;
import com.abiquo.vsm.monitor.AbstractMonitor;
/**
* The abstract libvirt monitor.
*
* @author eruiz@abiquo.com
*/
public abstract class LibvirtMonitor extends AbstractMonitor
{
/** The logger. */
private final static Logger LOGGER = LoggerFactory.getLogger(LibvirtMonitor.class);
@Override
public int getMaxNumberOfHypervisors()
{
return 1;
}
@Override
public void shutdown()
{
// Intentionally empty
}
@Override
public void start()
{
// Intentionally empty
}
@Override
public void publishState(String physicalMachineAddress, String virtualMachineName)
throws MonitorException
{
super.publishState(physicalMachineAddress, virtualMachineName);
// Connect to the hypervisor
PhysicalMachine pm = getPhysicalMachine(physicalMachineAddress);
Connect conn = connect(pm.getAddress());
Domain dom = null;
try
{
// Get concrete virtual machine state
dom = conn.domainLookupByName(virtualMachineName);
VMEventType state = translateEvent(dom.getInfo().state);
// Publish the state
notify(new VMEvent(state, physicalMachineAddress, virtualMachineName));
}
catch (LibvirtException e)
{
throw new MonitorException("Could not get the state of virtual machine: "
+ virtualMachineName, e);
}
finally
{
disconnect(conn, dom);
}
}
/**
* Creates a connection to the libvirt daemon of a physical machine.
*
* @param address The address of the physical machine.
* @return A new connection instance.
* @throws MonitorException When the address is invalid or if is impossible to connect with the
* libvirt daemon.
*/
private Connect connect(final String address) throws MonitorException
{
try
{
URL url = new URL(address);
return new Connect(buildHypervisorURL(url), false);
}
catch (MalformedURLException e)
{
throw new MonitorException("Invalid physical machine address " + address, e);
}
catch (LibvirtException e)
{
throw new MonitorException("Unable to connect with " + address, e);
}
}
/**
* Closes a connection to libvirt freeing first the used domain.
*
* @param conn The connection to close.
* @param dom The domain to free.
*/
private void disconnect(Connect conn, Domain dom)
{
try
{
if (dom != null)
{
dom.free();
}
if (conn != null)
{
conn.close();
}
}
catch (LibvirtException e)
{
LOGGER.error("Unable to close the connection to libvirt", e);
}
}
/**
* Translates an libvirt event code into an {@link VMEventType}.
*
* @param state Event code to translate.
* @return Translated event.
*/
private VMEventType translateEvent(final DomainState state)
{
VMEventType current = VMEventType.UNKNOWN;
switch (state)
{
case VIR_DOMAIN_RUNNING:
current = VMEventType.POWER_ON;
break;
case VIR_DOMAIN_PAUSED:
current = VMEventType.PAUSED;
break;
case VIR_DOMAIN_SHUTDOWN:
current = VMEventType.POWER_OFF;
break;
case VIR_DOMAIN_CRASHED:
current = VMEventType.UNKNOWN;
break;
case VIR_DOMAIN_SHUTOFF:
current = VMEventType.POWER_OFF;
break;
case VIR_DOMAIN_BLOCKED:
current = VMEventType.POWER_ON;
break;
case VIR_DOMAIN_NOSTATE:
current = VMEventType.UNKNOWN;
default:
break;
}
return current;
}
/**
* Builds a specific libvirt connection URI by each hypervisor.
*
* @param url The physical machine address, only host will be used.
* @return The specific libvirt connection URI.
*/
public abstract String buildHypervisorURL(final URL url);
}