forked from kubevirt/kubevirt
/
client.go
154 lines (134 loc) · 4.62 KB
/
client.go
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package eventsclient
import (
"encoding/json"
"fmt"
"net/rpc"
"path/filepath"
"github.com/libvirt/libvirt-go"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/watch"
"kubevirt.io/kubevirt/pkg/log"
notifyserver "kubevirt.io/kubevirt/pkg/virt-handler/notify-server"
"kubevirt.io/kubevirt/pkg/virt-launcher/virtwrap/api"
"kubevirt.io/kubevirt/pkg/virt-launcher/virtwrap/cli"
domainerrors "kubevirt.io/kubevirt/pkg/virt-launcher/virtwrap/errors"
"kubevirt.io/kubevirt/pkg/virt-launcher/virtwrap/util"
)
type DomainEventClient struct {
client *rpc.Client
}
func NewDomainEventClient(virtShareDir string) (*DomainEventClient, error) {
socketPath := filepath.Join(virtShareDir, "domain-notify.sock")
conn, err := rpc.Dial("unix", socketPath)
if err != nil {
log.Log.Reason(err).Errorf("client failed to connect to domain notifier socket: %s", socketPath)
return nil, err
}
return &DomainEventClient{client: conn}, nil
}
func (c *DomainEventClient) SendDomainEvent(event watch.Event) error {
var domainJSON []byte
var statusJSON []byte
var err error
if event.Type == watch.Error {
status := event.Object.(*metav1.Status)
statusJSON, err = json.Marshal(status)
if err != nil {
return err
}
} else {
domain := event.Object.(*api.Domain)
domainJSON, err = json.Marshal(domain)
if err != nil {
return err
}
}
args := ¬ifyserver.Args{
DomainJSON: string(domainJSON),
StatusJSON: string(statusJSON),
EventType: string(event.Type),
}
reply := ¬ifyserver.Reply{}
err = c.client.Call("Notify.DomainEvent", args, reply)
if err != nil {
return err
} else if reply.Success != true {
msg := fmt.Sprintf("failed to notify domain event: %s", reply.Message)
return fmt.Errorf(msg)
}
return nil
}
func newWatchEventError(err error) watch.Event {
return watch.Event{Type: watch.Error, Object: &metav1.Status{Status: metav1.StatusFailure, Message: err.Error()}}
}
func libvirtEventCallback(d cli.VirDomain, event *libvirt.DomainEventLifecycle, client *DomainEventClient, deleteNotificationSent chan watch.Event) {
// check for reconnects, and emit an error to force a resync
if event == nil {
client.SendDomainEvent(newWatchEventError(fmt.Errorf("Libvirt reconnect")))
return
}
domain, err := util.NewDomain(d)
if err != nil {
log.Log.Reason(err).Error("Could not create the Domain.")
client.SendDomainEvent(newWatchEventError(err))
return
}
// No matter which event, try to fetch the domain xml
// and the state. If we get a IsNotFound error, that
// means that the VirtualMachineInstance was removed.
spec, err := util.GetDomainSpec(d)
if err != nil {
if !domainerrors.IsNotFound(err) {
log.Log.Reason(err).Error("Could not fetch the Domain specification.")
client.SendDomainEvent(newWatchEventError(err))
return
}
} else {
domain.Spec = *spec
domain.ObjectMeta.UID = spec.Metadata.KubeVirt.UID
}
status, reason, err := d.GetState()
if err != nil {
if !domainerrors.IsNotFound(err) {
log.Log.Reason(err).Error("Could not fetch the Domain state.")
client.SendDomainEvent(newWatchEventError(err))
return
}
domain.SetState(api.NoState, api.ReasonNonExistent)
} else {
domain.SetState(util.ConvState(status), util.ConvReason(status, reason))
}
log.Log.Infof("domain status: %v:%v", status, reason)
switch domain.Status.Reason {
case api.ReasonNonExistent:
event := watch.Event{Type: watch.Deleted, Object: domain}
client.SendDomainEvent(event)
deleteNotificationSent <- event
default:
if event.Event == libvirt.DOMAIN_EVENT_DEFINED && libvirt.DomainEventDefinedDetailType(event.Detail) == libvirt.DOMAIN_EVENT_DEFINED_ADDED {
client.SendDomainEvent(watch.Event{Type: watch.Added, Object: domain})
} else {
client.SendDomainEvent(watch.Event{Type: watch.Modified, Object: domain})
}
}
}
func StartNotifier(virtShareDir string, domainConn cli.Connection, deleteNotificationSent chan watch.Event) error {
entrypointCallback := func(c *libvirt.Connect, d *libvirt.Domain, event *libvirt.DomainEventLifecycle) {
log.Log.Infof("Libvirt event %d with reason %d received", event.Event, event.Detail)
// TODO don't make a client every single time
client, err := NewDomainEventClient(virtShareDir)
if err != nil {
log.Log.Reason(err).Error("Unable to create domain event notify client")
return
}
libvirtEventCallback(d, event, client, deleteNotificationSent)
log.Log.Info("processed event")
}
err := domainConn.DomainEventLifecycleRegister(entrypointCallback)
if err != nil {
log.Log.Reason(err).Errorf("failed to register event callback with libvirt")
return err
}
log.Log.Infof("Registered libvirt event notify callback")
return nil
}