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// SPDX-License-Identifier: GPL-3.0-or-later
package kubernetes
import (
"context"
"fmt"
"net"
"strconv"
"strings"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/model"
"github.com/netdata/netdata/go/go.d.plugin/logger"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
type serviceTargetGroup struct {
targets []model.Target
source string
}
func (s serviceTargetGroup) Provider() string { return "sd:k8s:service" }
func (s serviceTargetGroup) Source() string { return s.source }
func (s serviceTargetGroup) Targets() []model.Target { return s.targets }
type ServiceTarget struct {
model.Base `hash:"ignore"`
hash uint64
tuid string
Address string
Namespace string
Name string
Annotations map[string]any
Labels map[string]any
Port string
PortName string
PortProtocol string
ClusterIP string
ExternalName string
Type string
}
func (s ServiceTarget) Hash() uint64 { return s.hash }
func (s ServiceTarget) TUID() string { return s.tuid }
type serviceDiscoverer struct {
*logger.Logger
model.Base
informer cache.SharedInformer
queue *workqueue.Type
}
func newServiceDiscoverer(inf cache.SharedInformer) *serviceDiscoverer {
if inf == nil {
panic("nil service informer")
}
queue := workqueue.NewWithConfig(workqueue.QueueConfig{Name: "service"})
_, _ = inf.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj any) { enqueue(queue, obj) },
UpdateFunc: func(_, obj any) { enqueue(queue, obj) },
DeleteFunc: func(obj any) { enqueue(queue, obj) },
})
return &serviceDiscoverer{
Logger: log,
informer: inf,
queue: queue,
}
}
func (s *serviceDiscoverer) String() string {
return "k8s service"
}
func (s *serviceDiscoverer) Discover(ctx context.Context, ch chan<- []model.TargetGroup) {
s.Info("instance is started")
defer s.Info("instance is stopped")
defer s.queue.ShutDown()
go s.informer.Run(ctx.Done())
if !cache.WaitForCacheSync(ctx.Done(), s.informer.HasSynced) {
s.Error("failed to sync caches")
return
}
go s.run(ctx, ch)
<-ctx.Done()
}
func (s *serviceDiscoverer) run(ctx context.Context, in chan<- []model.TargetGroup) {
for {
item, shutdown := s.queue.Get()
if shutdown {
return
}
s.handleQueueItem(ctx, in, item)
}
}
func (s *serviceDiscoverer) handleQueueItem(ctx context.Context, in chan<- []model.TargetGroup, item any) {
defer s.queue.Done(item)
key := item.(string)
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return
}
obj, exists, err := s.informer.GetStore().GetByKey(key)
if err != nil {
return
}
if !exists {
tgg := &serviceTargetGroup{source: serviceSourceFromNsName(namespace, name)}
send(ctx, in, tgg)
return
}
svc, err := toService(obj)
if err != nil {
return
}
tgg := s.buildTargetGroup(svc)
for _, tgt := range tgg.Targets() {
tgt.Tags().Merge(s.Tags())
}
send(ctx, in, tgg)
}
func (s *serviceDiscoverer) buildTargetGroup(svc *corev1.Service) model.TargetGroup {
// TODO: headless service?
if svc.Spec.ClusterIP == "" || len(svc.Spec.Ports) == 0 {
return &serviceTargetGroup{
source: serviceSource(svc),
}
}
return &serviceTargetGroup{
source: serviceSource(svc),
targets: s.buildTargets(svc),
}
}
func (s *serviceDiscoverer) buildTargets(svc *corev1.Service) (targets []model.Target) {
for _, port := range svc.Spec.Ports {
portNum := strconv.FormatInt(int64(port.Port), 10)
tgt := &ServiceTarget{
tuid: serviceTUID(svc, port),
Address: net.JoinHostPort(svc.Name+"."+svc.Namespace+".svc", portNum),
Namespace: svc.Namespace,
Name: svc.Name,
Annotations: mapAny(svc.Annotations),
Labels: mapAny(svc.Labels),
Port: portNum,
PortName: port.Name,
PortProtocol: string(port.Protocol),
ClusterIP: svc.Spec.ClusterIP,
ExternalName: svc.Spec.ExternalName,
Type: string(svc.Spec.Type),
}
hash, err := calcHash(tgt)
if err != nil {
continue
}
tgt.hash = hash
targets = append(targets, tgt)
}
return targets
}
func serviceTUID(svc *corev1.Service, port corev1.ServicePort) string {
return fmt.Sprintf("%s_%s_%s_%s",
svc.Namespace,
svc.Name,
strings.ToLower(string(port.Protocol)),
strconv.FormatInt(int64(port.Port), 10),
)
}
func serviceSourceFromNsName(namespace, name string) string {
return fmt.Sprintf("discoverer=k8s,kind=service,namespace=%s,service_name=%s", namespace, name)
}
func serviceSource(svc *corev1.Service) string {
return serviceSourceFromNsName(svc.Namespace, svc.Name)
}
func toService(obj any) (*corev1.Service, error) {
svc, ok := obj.(*corev1.Service)
if !ok {
return nil, fmt.Errorf("received unexpected object type: %T", obj)
}
return svc, nil
}
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