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authorDaniel P. Berrange <berrange@redhat.com>2012-07-13 17:05:17 +0800
committerGuannan Ren <gren@redhat.com>2012-07-14 16:02:26 +0800
commit49759db34e7cb65a431c66d0d9a14af5f809d09b (patch)
treecfde89ba703a6481908b948a763f801a24b2136f
parentcb8fb3d06281dc1c56bd8438f8d8a3b82ca95bcc (diff)
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Define public API for receiving guest memory balloon events
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>
-rw-r--r--libvirt-override-virConnect.py9
-rw-r--r--libvirt-override.c50
2 files changed, 59 insertions, 0 deletions
diff --git a/libvirt-override-virConnect.py b/libvirt-override-virConnect.py
index ecb5680..50177ab 100644
--- a/libvirt-override-virConnect.py
+++ b/libvirt-override-virConnect.py
@@ -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 """
diff --git a/libvirt-override.c b/libvirt-override.c
index 8ef9fa0..8b41dff 100644
--- a/libvirt-override.c
+++ b/libvirt-override.c
@@ -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) {