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Define public API for receiving guest memory balloon events

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When the guest changes its memory balloon applications may want
to know what the new value is, without having to periodically
poll on XML / domain info. Introduce a "balloon change" event
to let apps see this

* include/libvirt/libvirt.h.in: Define the
  virConnectDomainEventBalloonChangeCallback callback
  and VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE constant
* python/libvirt-override-virConnect.py,
  python/libvirt-override.c: Wire up helpers for new event
* daemon/remote.c: Helper for serializing balloon event
* examples/domain-events/events-c/event-test.c,
  examples/domain-events/events-python/event-test.py: Add
  example of balloon event usage
* src/conf/domain_event.c, src/conf/domain_event.h: Handling
  of balloon events
* src/remote/remote_driver.c: Add handler of balloon events
* src/remote/remote_protocol.x: Define wire protocol for
  balloon events
* src/remote_protocol-structs: Likewise.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange
2012-07-13 17:05:17 +08:00
committed by Guannan Ren
parent db4eba91a7
commit 7ed6d7dda7
12 changed files with 211 additions and 2 deletions
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9
python/libvirt-override-virConnect.py
View File

@@ -161,6 +161,15 @@
cb(self, virDomain(self, _obj=dom), reason, opaque)
return 0;
def _dispatchDomainEventBalloonChangeCallback(self, dom, actual, cbData):
"""Dispatches events to python user domain balloon change event callbacks
"""
cb = cbData["cb"]
opaque = cbData["opaque"]
cb(self, virDomain(self, _obj=dom), actual, opaque)
return 0
def domainEventDeregisterAny(self, callbackID):
"""Removes a Domain Event Callback. De-registering for a
domain callback will disable delivery of this event type """

50
python/libvirt-override.c
View File

@@ -5352,6 +5352,53 @@ libvirt_virConnectDomainEventPMSuspendCallback(virConnectPtr conn ATTRIBUTE_UNUS
return ret;
}
static int
libvirt_virConnectDomainEventBalloonChangeCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
unsigned long long actual,
void *opaque)
{
PyObject *pyobj_cbData = (PyObject*)opaque;
PyObject *pyobj_dom;
PyObject *pyobj_ret;
PyObject *pyobj_conn;
PyObject *dictKey;
int ret = -1;
LIBVIRT_ENSURE_THREAD_STATE;
/* Create a python instance of this virDomainPtr */
virDomainRef(dom);
pyobj_dom = libvirt_virDomainPtrWrap(dom);
Py_INCREF(pyobj_cbData);
dictKey = libvirt_constcharPtrWrap("conn");
pyobj_conn = PyDict_GetItem(pyobj_cbData, dictKey);
Py_DECREF(dictKey);
/* Call the Callback Dispatcher */
pyobj_ret = PyObject_CallMethod(pyobj_conn,
(char*)"_dispatchDomainEventBalloonChangeCallback",
(char*)"OLO",
pyobj_dom,
(PY_LONG_LONG)actual,
pyobj_cbData);
Py_DECREF(pyobj_cbData);
Py_DECREF(pyobj_dom);
if(!pyobj_ret) {
DEBUG("%s - ret:%p\n", __FUNCTION__, pyobj_ret);
PyErr_Print();
} else {
Py_DECREF(pyobj_ret);
ret = 0;
}
LIBVIRT_RELEASE_THREAD_STATE;
return ret;
}
static PyObject *
libvirt_virConnectDomainEventRegisterAny(ATTRIBUTE_UNUSED PyObject * self,
PyObject * args)
@@ -5421,6 +5468,9 @@ libvirt_virConnectDomainEventRegisterAny(ATTRIBUTE_UNUSED PyObject * self,
case VIR_DOMAIN_EVENT_ID_PMSUSPEND:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventPMSuspendCallback);
break;
case VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventBalloonChangeCallback);
break;
}
if (!cb) {