Re: [libvirt-users] virConnectDomainEventRegisterAny problem

22 Aug 2013


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21.08.2013 12:58, Alexandr пишет:
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21.08.2013 12:39, Daniel P. Berrange пишет:
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On Wed, Aug 21, 2013 at 12:36:06PM +0300, Alexandr wrote:
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21.08.2013 09:46, Alexandr пишет:
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21.08.2013 09:32, Martin Kletzander пишет:
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On Wed 21 Aug 2013 01:03:37 AM CEST, Alexandr wrote:
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good day. i trying to make callback function for 
VIR_DOMAIN_EVENT_ID_LIFECYCLE, i have successfully 
registering callback, but it never called, i need to
know when domain started, stopped or crashed, i have
write following code
static int    domain_event_handler(virConnectPtr conn, 
virDomainPtr dom, int event, int detail, void * opaque) {
 switch(event) { } return 0; }
..... int callback = 
virConnectDomainEventRegisterAny(libvirt_connection,
NULL, VIR_DOMAIN_EVENT_ID_LIFECYCLE, 
VIR_DOMAIN_EVENT_CALLBACK(domain_event_handler), NULL, 
NULL); if(callback == -1) { std::cout<<"Error: failed to 
register domain event handle callback\n"; return -1; } 
.....
but "domain_event_handler" is never called, what is
wrong here ?
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Are you running an event loop?  You can have a look at our
 examples [1] and see what's being done there.  Especially 
note the virEventRunDefaultImpl() [2] there.
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Martin
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[1] 
http://libvirt.org/git/?p=libvirt.git;a=blob;f=examples/domain-events/events...
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[2]
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http://libvirt.org/git/?p=libvirt.git;a=blob;f=examples/domain-events/events...
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oh..., i missed it, thx for hint and sorry for stupid questions .
now it's working except for events from other connections, for 
example i want to handle domain started by virt-manager, now i
do not have event when it's started, is exists any api to
handle this events, or i need to implement internal polling of
domains state in my application ?
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The events system reports all lifecycle events, regardless of 
which connection triggered them.
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If you're not seeing events from domains started by virt-manager 
then your almost certainly connecting to a different libvirt URI 
than virt-manager is using.
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Daniel
also looks like i do not receiving last event, i mean last event
what passed to callback is "eventcount - 1"
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after few days of trying i have not resolved problem, and have
followinf situation: i receiving events from my connection sometimes
(not all and not always), i do not receiving events from other
connections (virt-manager) at all (i am sure that connection url are
same for both connections), my code follows:

static int	domain_event_handler(virConnectPtr conn, virDomainPtr dom,
int event, int detail, void * opaque)
{
	std::cout<<"domain event handler called\n";
}

void libvirt_eventloop_thr_func()
{
	while(true) //TODO: stop somehow on exit
	{
		if(virEventRunDefaultImpl() < 0)
		{
			virErrorPtr err = virGetLastError();
			fprintf(stderr, "Failed to run event loop: %s\n", err &&
err->message ? err->message : "Unknown error");
		}
	}
}

....
	virSetErrorFunc(NULL, libvirt_error_handler);
	
	libvirt_connection = virConnectOpen("qemu:///system");
	if(libvirt_connection == NULL)
	{
		std::cout<<"failed to connect to qemu:///system\n";
		return -1;
	}
	std::cout<<"connected to qemu:///system\n";

	if (virEventRegisterDefaultImpl() < 0)
	{
		virErrorPtr err = virGetLastError();
		fprintf(stderr, "Failed to register event implementation: %s\n", err
&& err->message ? err->message: "Unknown error");
			return -1;
	}
	{
		int callback = virConnectDomainEventRegisterAny(libvirt_connection,
NULL, VIR_DOMAIN_EVENT_ID_LIFECYCLE,
VIR_DOMAIN_EVENT_CALLBACK(domain_event_handler), NULL, NULL);
		if(callback == -1)
		{
			std::cout<<"Error: failed to register domain event handle callback\n";
			return -1;
		}
	}

	
	boost::thread(boost::bind(&libvirt_eventloop_thr_func));
....


am i doing something wrong here ?
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