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libvirt/examples/domain-events/events-c/event-test.c
Daniel P. Berrange a6135ec1e6 Introduce a new event emitted when a virtualization failure occurs 
This introduces a new domain

  VIR_DOMAIN_EVENT_ID_CONTROL_ERROR

Which uses the existing generic callback

typedef void (*virConnectDomainEventGenericCallback)(virConnectPtr conn,
                                                     virDomainPtr dom,
                                                     void *opaque);

This event is intended to be emitted when there is a failure in
some part of the domain virtualization system. Whether the domain
continues to run/exist after the failure is an implementation
detail specific to the hypervisor.

The idea is that with some types of failure, hypervisors may
prefer to leave the domain running in a "degraded" mode of
operation. For example, if something goes wrong with the QEMU
monitor, it is possible to leave the guest OS running quite
happily. The mgmt app will simply loose the ability todo various
tasks. The mgmt app can then choose how/when to deal with the
failure that occured.
* daemon/remote.c: Dispatch of new event
* examples/domain-events/events-c/event-test.c: Demo catch
  of event
* include/libvirt/libvirt.h.in: Define event ID and callback
* src/conf/domain_event.c, src/conf/domain_event.h: Internal
  event handling
* src/remote/remote_driver.c: Receipt of new event from daemon
* src/remote/remote_protocol.x: Wire protocol for new event
* src/remote_protocol-structs: add new event for checks
2011-05-29 20:21:53 +08:00

392 lines
14 KiB
C
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#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <libvirt/libvirt.h>
#include <libvirt/virterror.h>
#define VIR_DEBUG(fmt) printf("%s:%d: " fmt "\n", __func__, __LINE__)
#define STREQ(a,b) (strcmp(a,b) == 0)
#ifndef ATTRIBUTE_UNUSED
# define ATTRIBUTE_UNUSED __attribute__((__unused__))
#endif
/* Prototypes */
const char *eventToString(int event);
int myEventAddHandleFunc (int fd, int event,
virEventHandleCallback cb,
void *opaque,
virFreeCallback ff);
void myEventUpdateHandleFunc(int watch, int event);
int myEventRemoveHandleFunc(int watch);
int myEventAddTimeoutFunc(int timeout,
virEventTimeoutCallback cb,
void *opaque,
virFreeCallback ff);
void myEventUpdateTimeoutFunc(int timer, int timout);
int myEventRemoveTimeoutFunc(int timer);
int myEventHandleTypeToPollEvent(virEventHandleType events);
virEventHandleType myPollEventToEventHandleType(int events);
void usage(const char *pname);
/* Callback functions */
const char *eventToString(int event) {
const char *ret = "";
switch(event) {
case VIR_DOMAIN_EVENT_DEFINED:
ret ="Defined";
break;
case VIR_DOMAIN_EVENT_UNDEFINED:
ret ="Undefined";
break;
case VIR_DOMAIN_EVENT_STARTED:
ret ="Started";
break;
case VIR_DOMAIN_EVENT_SUSPENDED:
ret ="Suspended";
break;
case VIR_DOMAIN_EVENT_RESUMED:
ret ="Resumed";
break;
case VIR_DOMAIN_EVENT_STOPPED:
ret ="Stopped";
break;
}
return ret;
}
static const char *eventDetailToString(int event, int detail) {
const char *ret = "";
switch(event) {
case VIR_DOMAIN_EVENT_DEFINED:
if (detail == VIR_DOMAIN_EVENT_DEFINED_ADDED)
ret = "Added";
else if (detail == VIR_DOMAIN_EVENT_DEFINED_UPDATED)
ret = "Updated";
break;
case VIR_DOMAIN_EVENT_UNDEFINED:
if (detail == VIR_DOMAIN_EVENT_UNDEFINED_REMOVED)
ret = "Removed";
break;
case VIR_DOMAIN_EVENT_STARTED:
switch (detail) {
case VIR_DOMAIN_EVENT_STARTED_BOOTED:
ret = "Booted";
break;
case VIR_DOMAIN_EVENT_STARTED_MIGRATED:
ret = "Migrated";
break;
case VIR_DOMAIN_EVENT_STARTED_RESTORED:
ret = "Restored";
break;
}
break;
case VIR_DOMAIN_EVENT_SUSPENDED:
if (detail == VIR_DOMAIN_EVENT_SUSPENDED_PAUSED)
ret = "Paused";
else if (detail == VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED)
ret = "Migrated";
break;
case VIR_DOMAIN_EVENT_RESUMED:
if (detail == VIR_DOMAIN_EVENT_RESUMED_UNPAUSED)
ret = "Unpaused";
else if (detail == VIR_DOMAIN_EVENT_RESUMED_MIGRATED)
ret = "Migrated";
break;
case VIR_DOMAIN_EVENT_STOPPED:
switch (detail) {
case VIR_DOMAIN_EVENT_STOPPED_SHUTDOWN:
ret = "Shutdown";
break;
case VIR_DOMAIN_EVENT_STOPPED_DESTROYED:
ret = "Destroyed";
break;
case VIR_DOMAIN_EVENT_STOPPED_CRASHED:
ret = "Crashed";
break;
case VIR_DOMAIN_EVENT_STOPPED_MIGRATED:
ret = "Migrated";
break;
case VIR_DOMAIN_EVENT_STOPPED_SAVED:
ret = "Failed";
break;
case VIR_DOMAIN_EVENT_STOPPED_FAILED:
ret = "Failed";
break;
}
break;
}
return ret;
}
static int myDomainEventCallback1(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
int event,
int detail,
void *opaque ATTRIBUTE_UNUSED)
{
printf("%s EVENT: Domain %s(%d) %s %s\n", __func__, virDomainGetName(dom),
virDomainGetID(dom), eventToString(event),
eventDetailToString(event, detail));
return 0;
}
static int myDomainEventCallback2(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
int event,
int detail,
void *opaque ATTRIBUTE_UNUSED)
{
printf("%s EVENT: Domain %s(%d) %s %s\n", __func__, virDomainGetName(dom),
virDomainGetID(dom), eventToString(event),
eventDetailToString(event, detail));
return 0;
}
static int myDomainEventRebootCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
void *opaque ATTRIBUTE_UNUSED)
{
printf("%s EVENT: Domain %s(%d) rebooted\n", __func__, virDomainGetName(dom),
virDomainGetID(dom));
return 0;
}
static int myDomainEventRTCChangeCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
long long offset,
void *opaque ATTRIBUTE_UNUSED)
{
char *str = NULL;
/* HACK: use asprintf since we have gnulib's wrapper for %lld on Win32
* but don't have a printf() replacement with %lld */
if (asprintf(&str, "%s EVENT: Domain %s(%d) rtc change %lld\n",
__func__, virDomainGetName(dom),
virDomainGetID(dom), offset) < 0)
return 0;
printf("%s", str);
free(str);
return 0;
}
static int myDomainEventWatchdogCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
int action,
void *opaque ATTRIBUTE_UNUSED)
{
printf("%s EVENT: Domain %s(%d) watchdog action=%d\n", __func__, virDomainGetName(dom),
virDomainGetID(dom), action);
return 0;
}
static int myDomainEventIOErrorCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
const char *srcPath,
const char *devAlias,
int action,
void *opaque ATTRIBUTE_UNUSED)
{
printf("%s EVENT: Domain %s(%d) io error path=%s alias=%s action=%d\n", __func__, virDomainGetName(dom),
virDomainGetID(dom), srcPath, devAlias, action);
return 0;
}
static int myDomainEventGraphicsCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
int phase,
virDomainEventGraphicsAddressPtr local,
virDomainEventGraphicsAddressPtr remote,
const char *authScheme,
virDomainEventGraphicsSubjectPtr subject,
void *opaque ATTRIBUTE_UNUSED)
{
int i;
printf("%s EVENT: Domain %s(%d) graphics ", __func__, virDomainGetName(dom),
virDomainGetID(dom));
switch (phase) {
case VIR_DOMAIN_EVENT_GRAPHICS_CONNECT:
printf("connected ");
break;
case VIR_DOMAIN_EVENT_GRAPHICS_INITIALIZE:
printf("initialized ");
break;
case VIR_DOMAIN_EVENT_GRAPHICS_DISCONNECT:
printf("disconnected ");
break;
}
printf("local: family=%d node=%s service=%s ",
local->family, local->node, local->service);
printf("remote: family=%d node=%s service=%s ",
remote->family, remote->node, remote->service);
printf("auth: %s ", authScheme);
for (i = 0 ; i < subject->nidentity ; i++) {
printf(" identity: %s=%s",
subject->identities[i].type,
subject->identities[i].name);
}
printf("\n");
return 0;
}
static int myDomainEventControlErrorCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
void *opaque ATTRIBUTE_UNUSED)
{
printf("%s EVENT: Domain %s(%d) control error\n", __func__, virDomainGetName(dom),
virDomainGetID(dom));
return 0;
}
static void myFreeFunc(void *opaque)
{
char *str = opaque;
printf("%s: Freeing [%s]\n", __func__, str);
free(str);
}
/* main test functions */
void usage(const char *pname)
{
printf("%s uri\n", pname);
}
int run = 1;
static void stop(int sig)
{
printf("Exiting on signal %d\n", sig);
run = 0;
}
int main(int argc, char **argv)
{
int callback1ret = -1;
int callback2ret = -1;
int callback3ret = -1;
int callback4ret = -1;
int callback5ret = -1;
int callback6ret = -1;
int callback7ret = -1;
int callback8ret = -1;
struct sigaction action_stop;
memset(&action_stop, 0, sizeof action_stop);
action_stop.sa_handler = stop;
if (argc > 1 && STREQ(argv[1], "--help")) {
usage(argv[0]);
return -1;
}
virEventRegisterDefaultImpl();
virConnectPtr dconn = NULL;
dconn = virConnectOpenReadOnly (argv[1] ? argv[1] : NULL);
if (!dconn) {
printf("error opening\n");
return -1;
}
sigaction(SIGTERM, &action_stop, NULL);
sigaction(SIGINT, &action_stop, NULL);
VIR_DEBUG("Registering domain event cbs");
/* Add 2 callbacks to prove this works with more than just one */
callback1ret = virConnectDomainEventRegister(dconn, myDomainEventCallback1,
strdup("callback 1"), myFreeFunc);
callback2ret = virConnectDomainEventRegisterAny(dconn,
NULL,
VIR_DOMAIN_EVENT_ID_LIFECYCLE,
VIR_DOMAIN_EVENT_CALLBACK(myDomainEventCallback2),
strdup("callback 2"), myFreeFunc);
callback3ret = virConnectDomainEventRegisterAny(dconn,
NULL,
VIR_DOMAIN_EVENT_ID_REBOOT,
VIR_DOMAIN_EVENT_CALLBACK(myDomainEventRebootCallback),
strdup("callback reboot"), myFreeFunc);
callback4ret = virConnectDomainEventRegisterAny(dconn,
NULL,
VIR_DOMAIN_EVENT_ID_RTC_CHANGE,
VIR_DOMAIN_EVENT_CALLBACK(myDomainEventRTCChangeCallback),
strdup("callback rtcchange"), myFreeFunc);
callback5ret = virConnectDomainEventRegisterAny(dconn,
NULL,
VIR_DOMAIN_EVENT_ID_WATCHDOG,
VIR_DOMAIN_EVENT_CALLBACK(myDomainEventWatchdogCallback),
strdup("callback watchdog"), myFreeFunc);
callback6ret = virConnectDomainEventRegisterAny(dconn,
NULL,
VIR_DOMAIN_EVENT_ID_IO_ERROR,
VIR_DOMAIN_EVENT_CALLBACK(myDomainEventIOErrorCallback),
strdup("callback io error"), myFreeFunc);
callback7ret = virConnectDomainEventRegisterAny(dconn,
NULL,
VIR_DOMAIN_EVENT_ID_GRAPHICS,
VIR_DOMAIN_EVENT_CALLBACK(myDomainEventGraphicsCallback),
strdup("callback graphics"), myFreeFunc);
callback8ret = virConnectDomainEventRegisterAny(dconn,
NULL,
VIR_DOMAIN_EVENT_ID_CONTROL_ERROR,
VIR_DOMAIN_EVENT_CALLBACK(myDomainEventControlErrorCallback),
strdup("callback control error"), myFreeFunc);
if ((callback1ret != -1) &&
(callback2ret != -1) &&
(callback3ret != -1) &&
(callback4ret != -1) &&
(callback5ret != -1) &&
(callback6ret != -1) &&
(callback7ret != -1)) {
while (run) {
if (virEventRunDefaultImpl() < 0) {
virErrorPtr err = virGetLastError();
fprintf(stderr, "Failed to run event loop: %s\n",
err && err->message ? err->message : "Unknown error");
}
}
VIR_DEBUG("Deregistering event handlers");
virConnectDomainEventDeregister(dconn, myDomainEventCallback1);
virConnectDomainEventDeregisterAny(dconn, callback2ret);
virConnectDomainEventDeregisterAny(dconn, callback3ret);
virConnectDomainEventDeregisterAny(dconn, callback4ret);
virConnectDomainEventDeregisterAny(dconn, callback5ret);
virConnectDomainEventDeregisterAny(dconn, callback6ret);
virConnectDomainEventDeregisterAny(dconn, callback7ret);
if (callback8ret != -1)
virConnectDomainEventDeregisterAny(dconn, callback8ret);
}
VIR_DEBUG("Closing connection");
if (dconn && virConnectClose(dconn) < 0) {
printf("error closing\n");
}
printf("done\n");
return 0;
}
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