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import libvirt


class LibVirtManager(object):
    def __init__(self, uri):
        self.conn = libvirt.open(uri)

    def createDomainFromXMLFile(self, xmlFile, flags):
        """
        if the libvirt.VIR_DOMAIN_START_PAUSED flags is set, the guest
        domain will be started, but its CPUs will remain paused.
        """
        xml = open(xmlFile).read()
        self.conn.createXML(xml, flags)

    def info(self, dom):
        infos = dom.info()
        print("""id = {dom_id}
name = {name}
state = {state}
max memory = {memory_size}
number of virt cpus = {cpus}
cpu time (in ns) = {cpu_time}
        """.format(
          dom_id=dom.ID(), name=dom.name(), state=infos[0],
          memory_size=infos[1], cpus=infos[3], cpu_time=infos[2]
        ))

    def __getattr__(self, attr):
        if hasattr(self.conn, attr):
            return getattr(self.conn, attr)
        raise AttributeError

if __name__ == "__main__":
    manager = LibVirtManager("qemu:///system")
    domain = manager.lookupByName('newvm')
    manager.info(domain)
    manager.listDefinedDomains()