| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package k8ssd |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "fmt" |
| 8 | "net" |
| 9 | "strconv" |
| 10 | "strings" |
| 11 | |
| 12 | "github.com/netdata/netdata/go/plugins/logger" |
| 13 | "github.com/netdata/netdata/go/plugins/plugin/agent/discovery/sd/model" |
| 14 | |
| 15 | corev1 "k8s.io/api/core/v1" |
| 16 | "k8s.io/client-go/tools/cache" |
| 17 | "k8s.io/client-go/util/workqueue" |
| 18 | ) |
| 19 | |
| 20 | type serviceTargetGroup struct { |
| 21 | targets []model.Target |
| 22 | source string |
| 23 | } |
| 24 | |
| 25 | func (s *serviceTargetGroup) Provider() string { return "sd:k8s:service" } |
| 26 | func (s *serviceTargetGroup) Source() string { return s.source } |
| 27 | func (s *serviceTargetGroup) Targets() []model.Target { return s.targets } |
| 28 | func (s *serviceTargetGroup) setSource(src string) { s.source = src } |
| 29 | |
| 30 | type ServiceTarget struct { |
| 31 | model.Base `hash:"ignore"` |
| 32 | |
| 33 | hash uint64 |
| 34 | tuid string |
| 35 | |
| 36 | Address string |
| 37 | Namespace string |
| 38 | Name string |
| 39 | Annotations map[string]any |
| 40 | Labels map[string]any |
| 41 | Port string |
| 42 | PortName string |
| 43 | PortProtocol string |
| 44 | ClusterIP string |
| 45 | ExternalName string |
| 46 | Type string |
| 47 | } |
| 48 | |
| 49 | func (s ServiceTarget) Hash() uint64 { return s.hash } |
| 50 | func (s ServiceTarget) TUID() string { return s.tuid } |
| 51 | |
| 52 | type serviceDiscoverer struct { |
| 53 | *logger.Logger |
| 54 | model.Base |
| 55 | |
| 56 | informer cache.SharedInformer |
| 57 | queue *workqueue.Typed[any] |
| 58 | } |
| 59 | |
| 60 | func newServiceDiscoverer(inf cache.SharedInformer) *serviceDiscoverer { |
| 61 | if inf == nil { |
| 62 | panic("nil service informer") |
| 63 | } |
| 64 | |
| 65 | queue := workqueue.NewTypedWithConfig(workqueue.TypedQueueConfig[any]{Name: "service"}) |
| 66 | |
| 67 | _, _ = inf.AddEventHandler(cache.ResourceEventHandlerFuncs{ |
| 68 | AddFunc: func(obj any) { enqueue(queue, obj) }, |
| 69 | UpdateFunc: func(_, obj any) { enqueue(queue, obj) }, |
| 70 | DeleteFunc: func(obj any) { enqueue(queue, obj) }, |
| 71 | }) |
| 72 | |
| 73 | return &serviceDiscoverer{ |
| 74 | Logger: log, |
| 75 | informer: inf, |
| 76 | queue: queue, |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | func (s *serviceDiscoverer) String() string { |
| 81 | return "k8s service" |
| 82 | } |
| 83 | |
| 84 | func (s *serviceDiscoverer) Discover(ctx context.Context, ch chan<- []model.TargetGroup) { |
| 85 | s.Info("instance is started") |
| 86 | defer s.Info("instance is stopped") |
| 87 | defer s.queue.ShutDown() |
| 88 | |
| 89 | go s.informer.Run(ctx.Done()) |
| 90 | |
| 91 | if !cache.WaitForCacheSync(ctx.Done(), s.informer.HasSynced) { |
| 92 | s.Error("failed to sync caches") |
| 93 | return |
| 94 | } |
| 95 | |
| 96 | go s.run(ctx, ch) |
| 97 | |
| 98 | <-ctx.Done() |
| 99 | } |
| 100 | |
| 101 | func (s *serviceDiscoverer) run(ctx context.Context, in chan<- []model.TargetGroup) { |
| 102 | for { |
| 103 | item, shutdown := s.queue.Get() |
| 104 | if shutdown { |
| 105 | return |
| 106 | } |
| 107 | |
| 108 | s.handleQueueItem(ctx, in, item) |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | func (s *serviceDiscoverer) handleQueueItem(ctx context.Context, in chan<- []model.TargetGroup, item any) { |
| 113 | defer s.queue.Done(item) |
| 114 | |
| 115 | key := item.(string) |
| 116 | namespace, name, err := cache.SplitMetaNamespaceKey(key) |
| 117 | if err != nil { |
| 118 | return |
| 119 | } |
| 120 | |
| 121 | obj, exists, err := s.informer.GetStore().GetByKey(key) |
| 122 | if err != nil { |
| 123 | return |
| 124 | } |
| 125 | |
| 126 | if !exists { |
| 127 | tgg := &serviceTargetGroup{source: serviceSourceFromNsName(namespace, name)} |
| 128 | model.SendTargetGroup(ctx, in, tgg) |
| 129 | return |
| 130 | } |
| 131 | |
| 132 | svc, err := toService(obj) |
| 133 | if err != nil { |
| 134 | return |
| 135 | } |
| 136 | |
| 137 | tgg := s.buildTargetGroup(svc) |
| 138 | |
| 139 | model.SendTargetGroup(ctx, in, tgg) |
| 140 | } |
| 141 | |
| 142 | func (s *serviceDiscoverer) buildTargetGroup(svc *corev1.Service) model.TargetGroup { |
| 143 | // TODO: headless service? |
| 144 | if svc.Spec.ClusterIP == "" || len(svc.Spec.Ports) == 0 { |
| 145 | return &serviceTargetGroup{ |
| 146 | source: serviceSource(svc), |
| 147 | } |
| 148 | } |
| 149 | return &serviceTargetGroup{ |
| 150 | source: serviceSource(svc), |
| 151 | targets: s.buildTargets(svc), |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | func (s *serviceDiscoverer) buildTargets(svc *corev1.Service) (targets []model.Target) { |
| 156 | for _, port := range svc.Spec.Ports { |
| 157 | portNum := strconv.FormatInt(int64(port.Port), 10) |
| 158 | tgt := &ServiceTarget{ |
| 159 | tuid: serviceTUID(svc, port), |
| 160 | Address: net.JoinHostPort(svc.Name+"."+svc.Namespace+".svc", portNum), |
| 161 | Namespace: svc.Namespace, |
| 162 | Name: svc.Name, |
| 163 | Annotations: model.MapAny(svc.Annotations), |
| 164 | Labels: model.MapAny(svc.Labels), |
| 165 | Port: portNum, |
| 166 | PortName: port.Name, |
| 167 | PortProtocol: string(port.Protocol), |
| 168 | ClusterIP: svc.Spec.ClusterIP, |
| 169 | ExternalName: svc.Spec.ExternalName, |
| 170 | Type: string(svc.Spec.Type), |
| 171 | } |
| 172 | hash, err := model.CalcHash(tgt) |
| 173 | if err != nil { |
| 174 | continue |
| 175 | } |
| 176 | tgt.hash = hash |
| 177 | |
| 178 | targets = append(targets, tgt) |
| 179 | } |
| 180 | |
| 181 | return targets |
| 182 | } |
| 183 | |
| 184 | func serviceTUID(svc *corev1.Service, port corev1.ServicePort) string { |
| 185 | return fmt.Sprintf("%s_%s_%s_%s", |
| 186 | svc.Namespace, |
| 187 | svc.Name, |
| 188 | strings.ToLower(string(port.Protocol)), |
| 189 | strconv.FormatInt(int64(port.Port), 10), |
| 190 | ) |
| 191 | } |
| 192 | |
| 193 | func serviceSourceFromNsName(namespace, name string) string { |
| 194 | return fmt.Sprintf("discoverer=k8s,kind=service,namespace=%s,service_name=%s", namespace, name) |
| 195 | } |
| 196 | |
| 197 | func serviceSource(svc *corev1.Service) string { |
| 198 | return serviceSourceFromNsName(svc.Namespace, svc.Name) |
| 199 | } |
| 200 | |
| 201 | func toService(obj any) (*corev1.Service, error) { |
| 202 | svc, ok := obj.(*corev1.Service) |
| 203 | if !ok { |
| 204 | return nil, fmt.Errorf("received unexpected object type: %T", obj) |
| 205 | } |
| 206 | return svc, nil |
| 207 | } |