/
k8s.go
132 lines (115 loc) · 3.45 KB
/
k8s.go
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package destination
import (
"context"
"fmt"
"os"
"github.com/rancher/opni/apis"
"github.com/rancher/opni/pkg/alerting/drivers/config"
"github.com/rancher/opni/pkg/alerting/shared"
"github.com/samber/lo"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
"log/slog"
typedv1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/record"
)
var (
scheme = runtime.NewScheme()
)
func init() {
apis.InitScheme(scheme)
}
type K8sDestination struct {
lg *slog.Logger
namespace string
recorder record.EventRecorder
}
type EventSinkImpl struct {
Interface typedv1.EventInterface
}
// Create takes the representation of a event and creates it. Returns the server's representation of the event, and an error, if there is any.
func (e *EventSinkImpl) Create(event *corev1.Event) (*corev1.Event, error) {
if event.Namespace == "" {
return nil, fmt.Errorf("can't create an event with empty namespace")
}
return e.Interface.Create(context.TODO(), event, metav1.CreateOptions{})
}
// Update takes the representation of a event and updates it. Returns the server's representation of the event, and an error, if there is any.
func (e *EventSinkImpl) Update(event *corev1.Event) (*corev1.Event, error) {
if event.Namespace == "" {
return nil, fmt.Errorf("can't update an event with empty namespace")
}
return e.Interface.Update(context.TODO(), event, metav1.UpdateOptions{})
}
// Patch applies the patch and returns the patched event, and an error, if there is any.
func (e *EventSinkImpl) Patch(event *corev1.Event, data []byte) (*corev1.Event, error) {
if event.Namespace == "" {
return nil, fmt.Errorf("can't patch an event with empty namespace")
}
return e.Interface.Patch(context.TODO(), event.Name, types.StrategicMergePatchType, data, metav1.PatchOptions{})
}
func NewEventSink(
eventClient typedv1.EventInterface,
) record.EventSink {
return &EventSinkImpl{
Interface: eventClient,
}
}
func NewK8sDestination(
lg *slog.Logger,
) (Destination, error) {
ns, ok := os.LookupEnv("POD_NAMESPACE")
if !ok {
return nil, fmt.Errorf("failed to find namespace to send kubernetes events to")
}
cfg, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
clientSet, err := kubernetes.NewForConfig(cfg)
if err != nil {
return nil, err
}
eventsClient := clientSet.CoreV1().Events(ns)
broadcaster := record.NewBroadcaster()
k := &K8sDestination{
recorder: broadcaster.NewRecorder(scheme, corev1.EventSource{Component: "opni-alerting"}),
namespace: ns,
}
defer broadcaster.StartRecordingToSink(
NewEventSink(eventsClient),
)
k.lg = lg.With("destination", k.Name())
return k, nil
}
func (k K8sDestination) Name() string {
return "k8s"
}
func (k K8sDestination) pushEvents(alerts []config.Alert) {
for _, alert := range alerts {
alert := alert
header, ok := alert.GetHeader()
if !ok {
header = missingTitle
}
summary, ok := alert.GetSummary()
if !ok {
summary = missingBody
}
k.recorder.AnnotatedEventf(&appsv1.StatefulSet{
ObjectMeta: metav1.ObjectMeta{
Name: shared.AlertmanagerService,
Namespace: k.namespace,
},
}, lo.Assign(alert.Annotations, alert.Labels), corev1.EventTypeWarning, header, summary)
}
}
func (k K8sDestination) Push(_ context.Context, msg config.WebhookMessage) error {
k.pushEvents(msg.Alerts)
return nil
}