Hi Daniel,
I tried that but it doesn't work:
func libvirt_close_callback(conn *libvirt.Connect, reason
libvirt.ConnectCloseReason){
log.Printf("close callback: %+v", reason)
}
func event_listen() {
log.Printf("event_listen %s", conf.Libvirt.LocalUrl)
hv, err := libvirt.NewConnect(conf.Libvirt.LocalUrl)
err = hv.RegisterCloseCallback(libvirt_close_callback)
if err != nil {
log.Printf("unable to register close callback")
return
}
...
The callback fires only when I kill my app,
^CGot signal:%!(EXTRA syscall.Signal=interrupt)
close callback: 0
but not when I restart libvirtd. I tried using both local and remote
connect URIs: qemu+ssh://10.130.16.101/system, qemu+ssh://localhost/system,
qemu+ssh:///system
Thanks.
D.
2017-05-17 15:24 GMT+02:00 Daniel P. Berrange <berra...@redhat.com>:
> On Wed, May 17, 2017 at 03:08:23PM +0200, Daniel Kučera wrote:
> > Hi all,
> >
> > I'm using libvirt-go and I following code to listen for lifecycle events:
> >
> > func event_listen() {
> > log.Printf("event_listen %s", conf.Libvirt.LocalUrl)
> > hv, err := libvirt.NewConnect(conf.Libvirt.LocalUrl)
> >
> > lifecycleCallback := func(c *libvirt.Connect, d *libvirt.Domain,
> event
> > *libvirt.DomainEventLifecycle) {
> > event_message(c, d, "lifecycle", event)
> > }
> >
> > _, err = hv.DomainEventLifecycleRegister(nil, lifecycleCallback)
> > if err != nil {
> > log.Printf("unable to register event callback")
> > return
> > }
> >
> > log.Printf("Libvirt event listener started")
> >
> > go func() {
> > for err == nil {
> > err = libvirt.EventRunDefaultImpl()
> > log.Printf("EventRunDefaultImpl err: %+v", err)
> > }
> > time.Sleep(time.Second)
> > event_listen()
> > }()
> >
> > }
> >
> > It works ok until I restart libvirtd (service libvirtd restart). After
> > that, the inner go func waits some time and continues without error. But
> > the callback is not working anymore.
> >
> > My question is, how can I detect hv reconnect (I guess it's happening in
> > background) so I know when to reinitialize callbacks?
>
> There is a separate event you can listen to that notifies when the
> connection
> is closed. See the RegisterCloseCallback() method on the Connect object.
>
> Basically register a callback there, and when it fires, unregister your
> existing domain event callbacks, and close your existing Connect object
> handle. Then fire a goroutine that loops once every few seconds trying
> to open a new Connect object, and when that succeeds register new
> domain event callbacks.
>
> Regards,
> Daniel
> --
> |: https://berrange.com -o- https://www.flickr.com/photos/
> dberrange :|
> |: https://libvirt.org -o-
> https://fstop138.berrange.com :|
> |: https://entangle-photo.org -o- https://www.instagram.com/
> dberrange :|
>
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