[libvirt] [PATCH 1/2] Add domain events support to LXC driver
Daniel P. Berrange
berrange at redhat.com
Wed Jul 22 16:02:55 UTC 2009
* src/lxc_conf.h: Add queue for dispatch of domain events
* src/lxc_driver.c: Trigger domain events upon important lifecycle transitions
Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
src/lxc_conf.h | 7 ++
src/lxc_driver.c | 181 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 185 insertions(+), 3 deletions(-)
diff --git a/src/lxc_conf.h b/src/lxc_conf.h
index 30a51e1..9690cc8 100644
--- a/src/lxc_conf.h
+++ b/src/lxc_conf.h
@@ -28,6 +28,7 @@
#include "internal.h"
#include "domain_conf.h"
+#include "domain_event.h"
#include "capabilities.h"
#include "threads.h"
@@ -47,6 +48,12 @@ struct __lxc_driver {
char *stateDir;
char *logDir;
int have_netns;
+
+ /* An array of callbacks */
+ virDomainEventCallbackListPtr domainEventCallbacks;
+ virDomainEventQueuePtr domainEventQueue;
+ int domainEventTimer;
+ int domainEventDispatching;
};
int lxcLoadDriverConfig(lxc_driver_t *driver);
diff --git a/src/lxc_driver.c b/src/lxc_driver.c
index 3503573..1b5c86c 100644
--- a/src/lxc_driver.c
+++ b/src/lxc_driver.c
@@ -67,6 +67,10 @@ static void lxcDriverUnlock(lxc_driver_t *driver)
virMutexUnlock(&driver->lock);
}
+static void lxcDomainEventFlush(int timer, void *opaque);
+static void lxcDomainEventQueue(lxc_driver_t *driver,
+ virDomainEventPtr event);
+
static virDrvOpenStatus lxcOpen(virConnectPtr conn,
virConnectAuthPtr auth ATTRIBUTE_UNUSED,
@@ -114,6 +118,12 @@ static virDrvOpenStatus lxcOpen(virConnectPtr conn,
static int lxcClose(virConnectPtr conn)
{
+ lxc_driver_t *driver = conn->privateData;
+
+ lxcDriverLock(driver);
+ virDomainEventCallbackListRemoveConn(conn, driver->domainEventCallbacks);
+ lxcDriverUnlock(driver);
+
conn->privateData = NULL;
return 0;
}
@@ -293,6 +303,8 @@ static virDomainPtr lxcDomainDefine(virConnectPtr conn, const char *xml)
virDomainDefPtr def = NULL;
virDomainObjPtr vm = NULL;
virDomainPtr dom = NULL;
+ virDomainEventPtr event = NULL;
+ int newVM = 1;
lxcDriverLock(driver);
if (!(def = virDomainDefParseString(conn, driver->caps, xml,
@@ -318,6 +330,12 @@ static virDomainPtr lxcDomainDefine(virConnectPtr conn, const char *xml)
goto cleanup;
}
+ event = virDomainEventNewFromObj(vm,
+ VIR_DOMAIN_EVENT_DEFINED,
+ newVM ?
+ VIR_DOMAIN_EVENT_DEFINED_ADDED :
+ VIR_DOMAIN_EVENT_DEFINED_UPDATED);
+
dom = virGetDomain(conn, vm->def->name, vm->def->uuid);
if (dom)
dom->id = vm->def->id;
@@ -326,6 +344,8 @@ cleanup:
virDomainDefFree(def);
if (vm)
virDomainObjUnlock(vm);
+ if (event)
+ lxcDomainEventQueue(driver, event);
lxcDriverUnlock(driver);
return dom;
}
@@ -334,6 +354,7 @@ static int lxcDomainUndefine(virDomainPtr dom)
{
lxc_driver_t *driver = dom->conn->privateData;
virDomainObjPtr vm;
+ virDomainEventPtr event = NULL;
int ret = -1;
lxcDriverLock(driver);
@@ -362,6 +383,10 @@ static int lxcDomainUndefine(virDomainPtr dom)
vm) < 0)
goto cleanup;
+ event = virDomainEventNewFromObj(vm,
+ VIR_DOMAIN_EVENT_UNDEFINED,
+ VIR_DOMAIN_EVENT_UNDEFINED_REMOVED);
+
virDomainRemoveInactive(&driver->domains, vm);
vm = NULL;
ret = 0;
@@ -369,6 +394,8 @@ static int lxcDomainUndefine(virDomainPtr dom)
cleanup:
if (vm)
virDomainObjUnlock(vm);
+ if (event)
+ lxcDomainEventQueue(driver, event);
lxcDriverUnlock(driver);
return ret;
}
@@ -532,6 +559,13 @@ static int lxcVMCleanup(virConnectPtr conn,
virCgroupFree(&cgroup);
}
+ if (vm->newDef) {
+ virDomainDefFree(vm->def);
+ vm->def = vm->newDef;
+ vm->def->id = -1;
+ vm->newDef = NULL;
+ }
+
return rc;
}
@@ -709,6 +743,7 @@ static void lxcMonitorEvent(int watch,
{
lxc_driver_t *driver = data;
virDomainObjPtr vm = NULL;
+ virDomainEventPtr event = NULL;
unsigned int i;
lxcDriverLock(driver);
@@ -731,12 +766,19 @@ static void lxcMonitorEvent(int watch,
goto cleanup;
}
- if (lxcVmTerminate(NULL, driver, vm, SIGINT) < 0)
+ if (lxcVmTerminate(NULL, driver, vm, SIGINT) < 0) {
virEventRemoveHandle(watch);
+ } else {
+ event = virDomainEventNewFromObj(vm,
+ VIR_DOMAIN_EVENT_STOPPED,
+ VIR_DOMAIN_EVENT_STOPPED_SHUTDOWN);
+ }
cleanup:
if (vm)
virDomainObjUnlock(vm);
+ if (event)
+ lxcDomainEventQueue(driver, event);
lxcDriverUnlock(driver);
}
@@ -977,6 +1019,7 @@ static int lxcDomainStart(virDomainPtr dom)
{
lxc_driver_t *driver = dom->conn->privateData;
virDomainObjPtr vm;
+ virDomainEventPtr event = NULL;
int ret = -1;
lxcDriverLock(driver);
@@ -995,9 +1038,16 @@ static int lxcDomainStart(virDomainPtr dom)
ret = lxcVmStart(dom->conn, driver, vm);
+ if (ret == 0)
+ event = virDomainEventNewFromObj(vm,
+ VIR_DOMAIN_EVENT_STARTED,
+ VIR_DOMAIN_EVENT_STARTED_BOOTED);
+
cleanup:
if (vm)
virDomainObjUnlock(vm);
+ if (event)
+ lxcDomainEventQueue(driver, event);
lxcDriverUnlock(driver);
return ret;
}
@@ -1020,6 +1070,7 @@ lxcDomainCreateAndStart(virConnectPtr conn,
virDomainObjPtr vm = NULL;
virDomainDefPtr def;
virDomainPtr dom = NULL;
+ virDomainEventPtr event = NULL;
lxcDriverLock(driver);
if (!(def = virDomainDefParseString(conn, driver->caps, xml,
@@ -1043,6 +1094,10 @@ lxcDomainCreateAndStart(virConnectPtr conn,
goto cleanup;
}
+ event = virDomainEventNewFromObj(vm,
+ VIR_DOMAIN_EVENT_STARTED,
+ VIR_DOMAIN_EVENT_STARTED_BOOTED);
+
dom = virGetDomain(conn, vm->def->name, vm->def->uuid);
if (dom)
dom->id = vm->def->id;
@@ -1051,6 +1106,8 @@ cleanup:
virDomainDefFree(def);
if (vm)
virDomainObjUnlock(vm);
+ if (event)
+ lxcDomainEventQueue(driver, event);
lxcDriverUnlock(driver);
return dom;
}
@@ -1067,6 +1124,7 @@ static int lxcDomainShutdown(virDomainPtr dom)
{
lxc_driver_t *driver = dom->conn->privateData;
virDomainObjPtr vm;
+ virDomainEventPtr event = NULL;
int ret = -1;
lxcDriverLock(driver);
@@ -1078,6 +1136,9 @@ static int lxcDomainShutdown(virDomainPtr dom)
}
ret = lxcVmTerminate(dom->conn, driver, vm, 0);
+ event = virDomainEventNewFromObj(vm,
+ VIR_DOMAIN_EVENT_STOPPED,
+ VIR_DOMAIN_EVENT_STOPPED_SHUTDOWN);
if (!vm->persistent) {
virDomainRemoveInactive(&driver->domains, vm);
vm = NULL;
@@ -1086,10 +1147,103 @@ static int lxcDomainShutdown(virDomainPtr dom)
cleanup:
if (vm)
virDomainObjUnlock(vm);
+ if (event)
+ lxcDomainEventQueue(driver, event);
+ lxcDriverUnlock(driver);
+ return ret;
+}
+
+
+static int
+lxcDomainEventRegister (virConnectPtr conn,
+ virConnectDomainEventCallback callback,
+ void *opaque,
+ virFreeCallback freecb)
+{
+ lxc_driver_t *driver = conn->privateData;
+ int ret;
+
+ lxcDriverLock(driver);
+ ret = virDomainEventCallbackListAdd(conn, driver->domainEventCallbacks,
+ callback, opaque, freecb);
lxcDriverUnlock(driver);
+
return ret;
}
+static int
+lxcDomainEventDeregister (virConnectPtr conn,
+ virConnectDomainEventCallback callback)
+{
+ lxc_driver_t *driver = conn->privateData;
+ int ret;
+
+ lxcDriverLock(driver);
+ if (driver->domainEventDispatching)
+ ret = virDomainEventCallbackListMarkDelete(conn, driver->domainEventCallbacks,
+ callback);
+ else
+ ret = virDomainEventCallbackListRemove(conn, driver->domainEventCallbacks,
+ callback);
+ lxcDriverUnlock(driver);
+
+ return ret;
+}
+
+static void lxcDomainEventDispatchFunc(virConnectPtr conn,
+ virDomainEventPtr event,
+ virConnectDomainEventCallback cb,
+ void *cbopaque,
+ void *opaque)
+{
+ lxc_driver_t *driver = opaque;
+
+ /* Drop the lock whle dispatching, for sake of re-entrancy */
+ lxcDriverUnlock(driver);
+ virDomainEventDispatchDefaultFunc(conn, event, cb, cbopaque, NULL);
+ lxcDriverLock(driver);
+}
+
+
+static void lxcDomainEventFlush(int timer ATTRIBUTE_UNUSED, void *opaque)
+{
+ lxc_driver_t *driver = opaque;
+ virDomainEventQueue tempQueue;
+
+ lxcDriverLock(driver);
+
+ driver->domainEventDispatching = 1;
+
+ /* Copy the queue, so we're reentrant safe */
+ tempQueue.count = driver->domainEventQueue->count;
+ tempQueue.events = driver->domainEventQueue->events;
+ driver->domainEventQueue->count = 0;
+ driver->domainEventQueue->events = NULL;
+
+ virEventUpdateTimeout(driver->domainEventTimer, -1);
+ virDomainEventQueueDispatch(&tempQueue,
+ driver->domainEventCallbacks,
+ lxcDomainEventDispatchFunc,
+ driver);
+
+ /* Purge any deleted callbacks */
+ virDomainEventCallbackListPurgeMarked(driver->domainEventCallbacks);
+
+ driver->domainEventDispatching = 0;
+ lxcDriverUnlock(driver);
+}
+
+
+/* driver must be locked before calling */
+static void lxcDomainEventQueue(lxc_driver_t *driver,
+ virDomainEventPtr event)
+{
+ if (virDomainEventQueuePush(driver->domainEventQueue,
+ event) < 0)
+ virDomainEventFree(event);
+ if (lxc_driver->domainEventQueue->count == 1)
+ virEventUpdateTimeout(driver->domainEventTimer, 0);
+}
/**
* lxcDomainDestroy:
@@ -1103,6 +1257,7 @@ static int lxcDomainDestroy(virDomainPtr dom)
{
lxc_driver_t *driver = dom->conn->privateData;
virDomainObjPtr vm;
+ virDomainEventPtr event = NULL;
int ret = -1;
lxcDriverLock(driver);
@@ -1114,6 +1269,9 @@ static int lxcDomainDestroy(virDomainPtr dom)
}
ret = lxcVmTerminate(dom->conn, driver, vm, SIGKILL);
+ event = virDomainEventNewFromObj(vm,
+ VIR_DOMAIN_EVENT_STOPPED,
+ VIR_DOMAIN_EVENT_STOPPED_DESTROYED);
if (!vm->persistent) {
virDomainRemoveInactive(&driver->domains, vm);
vm = NULL;
@@ -1122,6 +1280,8 @@ static int lxcDomainDestroy(virDomainPtr dom)
cleanup:
if (vm)
virDomainObjUnlock(vm);
+ if (event)
+ lxcDomainEventQueue(driver, event);
lxcDriverUnlock(driver);
return ret;
}
@@ -1172,6 +1332,15 @@ static int lxcStartup(int privileged)
if(lxcContainerAvailable(0) < 0)
goto cleanup;
+ if(VIR_ALLOC(lxc_driver->domainEventCallbacks) < 0)
+ goto cleanup;
+ if (!(lxc_driver->domainEventQueue = virDomainEventQueueNew()))
+ goto cleanup;
+
+ if ((lxc_driver->domainEventTimer =
+ virEventAddTimeout(-1, lxcDomainEventFlush, lxc_driver, NULL)) < 0)
+ goto cleanup;
+
lxc_driver->have_netns = lxcCheckNetNsSupport();
/* Call function to load lxc driver configuration information */
@@ -1252,6 +1421,12 @@ static int lxcShutdown(void)
lxcDriverLock(lxc_driver);
virDomainObjListFree(&lxc_driver->domains);
+ virDomainEventCallbackListFree(lxc_driver->domainEventCallbacks);
+ virDomainEventQueueFree(lxc_driver->domainEventQueue);
+
+ if (lxc_driver->domainEventTimer != -1)
+ virEventRemoveTimeout(lxc_driver->domainEventTimer);
+
virCapabilitiesFree(lxc_driver->caps);
VIR_FREE(lxc_driver->configDir);
VIR_FREE(lxc_driver->autostartDir);
@@ -1490,8 +1665,8 @@ static virDriver lxcDriver = {
NULL, /* domainMemoryPeek */
nodeGetCellsFreeMemory, /* nodeGetCellsFreeMemory */
nodeGetFreeMemory, /* getFreeMemory */
- NULL, /* domainEventRegister */
- NULL, /* domainEventDeregister */
+ lxcDomainEventRegister, /* domainEventRegister */
+ lxcDomainEventDeregister, /* domainEventDeregister */
NULL, /* domainMigratePrepare2 */
NULL, /* domainMigrateFinish2 */
NULL, /* nodeDeviceDettach */
--
1.6.2.5
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