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pkg/metrics,pkg/reconciler: support legacy operator cr metrics
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| Copyright 2020 The Operator-SDK Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package metrics | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "sigs.k8s.io/controller-runtime/pkg/event" | ||
| ) | ||
|
|
||
| type LegacyInfoGauge struct { | ||
| *prometheus.GaugeVec | ||
| } | ||
|
|
||
| func legacyInfoGaugeName(kind string) string { | ||
| return fmt.Sprintf("%s_info", strings.ToLower(kind)) | ||
| } | ||
|
|
||
| func NewLegacyInfoGauge(kind string) *LegacyInfoGauge { | ||
| return &LegacyInfoGauge{ | ||
| prometheus.NewGaugeVec(prometheus.GaugeOpts{ | ||
| Name: legacyInfoGaugeName(kind), | ||
| Help: fmt.Sprintf("Information about the %s custom resource", kind), | ||
| }, []string{"namespace", "name"}), | ||
| } | ||
| } | ||
|
|
||
| func (vec *LegacyInfoGauge) Create(e event.CreateEvent) { | ||
| name := e.Meta.GetName() | ||
| namespace := e.Meta.GetNamespace() | ||
| vec.set(name, namespace) | ||
| } | ||
|
|
||
| func (vec *LegacyInfoGauge) Update(e event.UpdateEvent) { | ||
| name := e.MetaNew.GetName() | ||
| namespace := e.MetaNew.GetNamespace() | ||
| vec.set(name, namespace) | ||
| } | ||
|
|
||
| func (vec *LegacyInfoGauge) Delete(e event.DeleteEvent) { | ||
| vec.GaugeVec.Delete(map[string]string{ | ||
| "name": e.Meta.GetName(), | ||
| "namespace": e.Meta.GetNamespace(), | ||
| }) | ||
| } | ||
|
|
||
| func (vec *LegacyInfoGauge) set(name, namespace string) { | ||
| labels := map[string]string{ | ||
| "name": name, | ||
| "namespace": namespace, | ||
| } | ||
| m, err := vec.GaugeVec.GetMetricWith(labels) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| m.Set(1) | ||
| } | ||
|
|
||
| func NewLegacyRegistry(kind string) RegistererGathererPredicater { | ||
| crInfo := NewLegacyInfoGauge(kind) | ||
| r := NewRegistry() | ||
| r.MustRegister(crInfo) | ||
| return r | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| /* | ||
| Copyright 2020 The Operator-SDK Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package metrics | ||
|
|
||
| import ( | ||
| "context" | ||
| "net" | ||
| "net/http" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| "sigs.k8s.io/controller-runtime/pkg/event" | ||
| logf "sigs.k8s.io/controller-runtime/pkg/log" | ||
| "sigs.k8s.io/controller-runtime/pkg/predicate" | ||
| ) | ||
|
|
||
| var ( | ||
| log = logf.Log.WithName("kube-state-metrics") | ||
| ) | ||
|
|
||
| type CreateEventHandler interface { | ||
| Create(e event.CreateEvent) | ||
| } | ||
|
|
||
| type UpdateEventHandler interface { | ||
| Update(e event.UpdateEvent) | ||
| } | ||
|
|
||
| type DeleteEventHandler interface { | ||
| Delete(e event.DeleteEvent) | ||
| } | ||
|
|
||
| type GenericEventHandler interface { | ||
| Generic(e event.GenericEvent) | ||
| } | ||
|
|
||
| type RegistererGathererPredicater interface { | ||
| prometheus.Registerer | ||
| prometheus.Gatherer | ||
| Predicate() predicate.Predicate | ||
| } | ||
|
|
||
| type Registry struct { | ||
| *prometheus.Registry | ||
| metrics []prometheus.Collector | ||
| } | ||
|
|
||
| func NewRegistry() RegistererGathererPredicater { | ||
| return &Registry{ | ||
| Registry: prometheus.NewRegistry(), | ||
| } | ||
| } | ||
|
|
||
| func (r *Registry) Register(c prometheus.Collector) error { | ||
| if err := r.Registry.Register(c); err != nil { | ||
| return err | ||
| } | ||
| r.metrics = append(r.metrics, c) | ||
| return nil | ||
| } | ||
|
|
||
| func (r *Registry) MustRegister(cs ...prometheus.Collector) { | ||
| for _, c := range cs { | ||
| if err := r.Register(c); err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (r *Registry) Predicate() predicate.Predicate { | ||
| createHandlers := []CreateEventHandler{} | ||
| updateHandlers := []UpdateEventHandler{} | ||
| deleteHandlers := []DeleteEventHandler{} | ||
| genericHandlers := []GenericEventHandler{} | ||
|
|
||
| for _, m := range r.metrics { | ||
| if m, ok := m.(CreateEventHandler); ok { | ||
| createHandlers = append(createHandlers, m) | ||
| } | ||
| if m, ok := m.(UpdateEventHandler); ok { | ||
| updateHandlers = append(updateHandlers, m) | ||
| } | ||
| if m, ok := m.(DeleteEventHandler); ok { | ||
| deleteHandlers = append(deleteHandlers, m) | ||
| } | ||
| if m, ok := m.(GenericEventHandler); ok { | ||
| genericHandlers = append(genericHandlers, m) | ||
| } | ||
| } | ||
|
|
||
| return predicate.Funcs{ | ||
| CreateFunc: func(e event.CreateEvent) bool { | ||
| for _, m := range createHandlers { | ||
| m.Create(e) | ||
| } | ||
| return true | ||
| }, | ||
| UpdateFunc: func(e event.UpdateEvent) bool { | ||
| for _, m := range updateHandlers { | ||
| m.Update(e) | ||
| } | ||
| return true | ||
| }, | ||
| DeleteFunc: func(e event.DeleteEvent) bool { | ||
| for _, m := range deleteHandlers { | ||
| m.Delete(e) | ||
| } | ||
| return true | ||
| }, | ||
| GenericFunc: func(e event.GenericEvent) bool { | ||
| for _, m := range genericHandlers { | ||
| m.Generic(e) | ||
| } | ||
| return true | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| type Server struct { | ||
| Gatherer prometheus.Gatherer | ||
| ListenAddress string | ||
| } | ||
|
|
||
| const metricsPath = "/metrics" | ||
|
|
||
| func (s *Server) Start(stop <-chan struct{}) error { | ||
| log.Info("metrics server is starting to listen", "addr", s.ListenAddress) | ||
| l, err := net.Listen("tcp", s.ListenAddress) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| handler := promhttp.HandlerFor(s.Gatherer, promhttp.HandlerOpts{ | ||
| ErrorHandling: promhttp.HTTPErrorOnError, | ||
| }) | ||
| mux := http.NewServeMux() | ||
| mux.Handle(metricsPath, handler) | ||
|
|
||
| server := http.Server{ | ||
| Handler: mux, | ||
| } | ||
|
|
||
| errChan := make(chan error) | ||
| go func() { | ||
| log.Info("starting metrics server", "path", metricsPath) | ||
| if err := server.Serve(l); err != nil && err != http.ErrServerClosed { | ||
| errChan <- err | ||
| } | ||
| }() | ||
|
|
||
| select { | ||
| case err := <-errChan: | ||
| return err | ||
| case <-stop: | ||
| if err := server.Shutdown(context.Background()); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } |
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