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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,271 @@ | ||
| /* | ||
| Copyright 2020 SAP SE | ||
| 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 event | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "math/rand" | ||
| "time" | ||
|
|
||
| v1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/api/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| utilruntime "k8s.io/apimachinery/pkg/util/runtime" | ||
| "k8s.io/apimachinery/pkg/watch" | ||
| restclient "k8s.io/client-go/rest" | ||
| "k8s.io/client-go/tools/record" | ||
| "k8s.io/client-go/tools/record/util" | ||
| ref "k8s.io/client-go/tools/reference" | ||
| "k8s.io/klog/v2" | ||
| "k8s.io/utils/clock" | ||
| ) | ||
|
|
||
| const maxTriesPerEvent = 12 | ||
|
|
||
| var defaultSleepDuration = 10 * time.Second | ||
|
|
||
| const maxQueuedEvents = 1000 | ||
|
|
||
| // More or less copied from client-go. | ||
| type eventBroadcasterImpl struct { | ||
| *watch.Broadcaster | ||
| sleepDuration time.Duration | ||
| options record.CorrelatorOptions | ||
| } | ||
|
|
||
| // Creates a new event broadcaster. | ||
| func NewNodeBroadcaster() record.EventBroadcaster { | ||
| return &eventBroadcasterImpl{ | ||
| Broadcaster: watch.NewBroadcaster(maxQueuedEvents, watch.DropIfChannelFull), | ||
| sleepDuration: defaultSleepDuration, | ||
| } | ||
| } | ||
|
|
||
| // StartRecordingToSink starts sending events received from the specified eventBroadcaster to the given sink. | ||
| // The return value can be ignored or used to stop recording, if desired. | ||
| func (e *eventBroadcasterImpl) StartRecordingToSink(sink record.EventSink) watch.Interface { | ||
| eventCorrelator := record.NewEventCorrelatorWithOptions(e.options) | ||
| return e.StartEventWatcher( | ||
| func(event *v1.Event) { | ||
| recordToSink(sink, event, eventCorrelator, e.sleepDuration) | ||
| }) | ||
| } | ||
|
|
||
| func (e *eventBroadcasterImpl) Shutdown() { | ||
| e.Broadcaster.Shutdown() | ||
| } | ||
|
|
||
| func recordToSink(sink record.EventSink, event *v1.Event, | ||
| eventCorrelator *record.EventCorrelator, sleepDuration time.Duration) { | ||
| // Make a copy before modification, because there could be multiple listeners. | ||
| // Events are safe to copy like this. | ||
| eventCopy := *event | ||
| event = &eventCopy | ||
| result, err := eventCorrelator.EventCorrelate(event) | ||
| if err != nil { | ||
| utilruntime.HandleError(err) | ||
| } | ||
| if result.Skip { | ||
| return | ||
| } | ||
| tries := 0 | ||
| for { | ||
| if recordEvent(sink, result.Event, result.Patch, result.Event.Count > 1, eventCorrelator) { | ||
| break | ||
| } | ||
| tries++ | ||
| if tries >= maxTriesPerEvent { | ||
| klog.Errorf("Unable to write event '%#v' (retry limit exceeded!)", event) | ||
| break | ||
| } | ||
| // Randomize the first sleep so that various clients won't all be | ||
| // synced up if the master goes down. | ||
| if tries == 1 { | ||
| time.Sleep(time.Duration(float64(sleepDuration) * rand.Float64())) //nolint:gosec | ||
| } else { | ||
| time.Sleep(sleepDuration) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // recordEvent attempts to write event to a sink. It returns true if the event | ||
| // was successfully recorded or discarded, false if it should be retried. | ||
| // If updateExistingEvent is false, it creates a new event, otherwise it updates | ||
| // existing event. | ||
| func recordEvent(sink record.EventSink, event *v1.Event, patch []byte, | ||
| updateExistingEvent bool, eventCorrelator *record.EventCorrelator) bool { | ||
| var newEvent *v1.Event | ||
| var err error | ||
| if updateExistingEvent { | ||
| newEvent, err = sink.Patch(event, patch) | ||
| } | ||
| // Update can fail because the event may have been removed and it no longer exists. | ||
| if !updateExistingEvent || (updateExistingEvent && util.IsKeyNotFoundError(err)) { | ||
| // Making sure that ResourceVersion is empty on creation | ||
| event.ResourceVersion = "" | ||
| newEvent, err = sink.Create(event) | ||
| } | ||
| if err == nil { | ||
| // we need to update our event correlator with the server returned state to handle name/resourceversion | ||
| eventCorrelator.UpdateState(newEvent) | ||
| return true | ||
| } | ||
|
|
||
| // If we can't contact the server, then hold everything while we keep trying. | ||
| // Otherwise, something about the event is malformed and we should abandon it. | ||
| switch err.(type) { | ||
| case *restclient.RequestConstructionError: | ||
| // We will construct the request the same next time, so don't keep trying. | ||
| klog.Errorf("Unable to construct event '%#v': '%v' (will not retry!)", event, err) | ||
| return true | ||
| case *errors.StatusError: | ||
| if errors.IsAlreadyExists(err) { | ||
| klog.V(5).Infof("Server rejected event '%#v': '%v' (will not retry!)", event, err) //nolint:gomnd | ||
| } else { | ||
| klog.Errorf("Server rejected event '%#v': '%v' (will not retry!)", event, err) | ||
| } | ||
| return true | ||
| case *errors.UnexpectedObjectError: | ||
| // We don't expect this; it implies the server's response didn't match a | ||
| // known pattern. Go ahead and retry. | ||
| default: | ||
| // This case includes actual http transport errors. Go ahead and retry. | ||
| } | ||
| klog.Errorf("Unable to write event: '%#v': '%v'(may retry after sleeping)", event, err) | ||
| return false | ||
| } | ||
|
|
||
| // StartLogging starts sending events received from this EventBroadcaster to the given logging function. | ||
| // The return value can be ignored or used to stop recording, if desired. | ||
| func (e *eventBroadcasterImpl) StartLogging(logf func(format string, args ...interface{})) watch.Interface { | ||
| return e.StartEventWatcher( | ||
| func(e *v1.Event) { | ||
| logf("Event(%#v): type: '%v' reason: '%v' %v", e.InvolvedObject, e.Type, e.Reason, e.Message) | ||
| }) | ||
| } | ||
|
|
||
| // StartStructuredLogging starts sending events received from this EventBroadcaster to the structured logging function. | ||
| // The return value can be ignored or used to stop recording, if desired. | ||
| func (e *eventBroadcasterImpl) StartStructuredLogging(verbosity klog.Level) watch.Interface { | ||
| return e.StartEventWatcher( | ||
| func(e *v1.Event) { | ||
| klog.V(verbosity).InfoS("Event occurred", "object", klog.KRef(e.InvolvedObject.Namespace, e.InvolvedObject.Name), | ||
| "kind", e.InvolvedObject.Kind, "apiVersion", e.InvolvedObject.APIVersion, | ||
| "type", e.Type, "reason", e.Reason, "message", e.Message) | ||
| }) | ||
| } | ||
|
|
||
| // StartEventWatcher starts sending events received from this EventBroadcaster to the given event handler function. | ||
| // The return value can be ignored or used to stop recording, if desired. | ||
| func (e *eventBroadcasterImpl) StartEventWatcher(eventHandler func(*v1.Event)) watch.Interface { | ||
| watcher := e.Watch() | ||
| go func() { | ||
| defer utilruntime.HandleCrash() | ||
| for watchEvent := range watcher.ResultChan() { | ||
| event, ok := watchEvent.Object.(*v1.Event) | ||
| if !ok { | ||
| // This is all local, so there's no reason this should | ||
| // ever happen. | ||
| continue | ||
| } | ||
| eventHandler(event) | ||
| } | ||
| }() | ||
| return watcher | ||
| } | ||
|
|
||
| // NewRecorder returns an EventRecorder that records events with the given event source. | ||
| func (e *eventBroadcasterImpl) NewRecorder(scheme *runtime.Scheme, source v1.EventSource) record.EventRecorder { | ||
| return &NodeRecorder{scheme, source, e.Broadcaster, clock.RealClock{}} | ||
| } | ||
|
|
||
| type NodeRecorder struct { | ||
| scheme *runtime.Scheme | ||
| source v1.EventSource | ||
| *watch.Broadcaster | ||
| clock clock.Clock | ||
| } | ||
|
|
||
| func (recorder *NodeRecorder) generateEvent(object runtime.Object, annotations map[string]string, | ||
| source *v1.EventSource, eventtype, reason, message string) { | ||
| ref, err := ref.GetReference(recorder.scheme, object) | ||
| if err != nil { | ||
| klog.Errorf("Could not construct reference to: '%#v' due to: '%v'. Will not report event: '%v' '%v' '%v'", | ||
| object, err, eventtype, reason, message) | ||
| return | ||
| } | ||
|
|
||
| if !util.ValidateEventType(eventtype) { | ||
| klog.Errorf("Unsupported event type: '%v'", eventtype) | ||
| return | ||
| } | ||
|
|
||
| event := recorder.makeEvent(ref, annotations, eventtype, reason, message) | ||
| if source == nil { | ||
| event.Source = recorder.source | ||
| } else { | ||
| event.Source = *source | ||
| } | ||
|
|
||
| go func() { | ||
| // NOTE: events should be a non-blocking operation | ||
| defer utilruntime.HandleCrash() | ||
| recorder.Action(watch.Added, event) | ||
| }() | ||
| } | ||
|
|
||
| func (recorder *NodeRecorder) Event(object runtime.Object, eventtype, reason, message string) { | ||
| recorder.generateEvent(object, nil, nil, eventtype, reason, message) | ||
| } | ||
|
|
||
| func (recorder *NodeRecorder) Eventf(object runtime.Object, | ||
| eventtype, reason, messageFmt string, args ...interface{}) { | ||
| recorder.Event(object, eventtype, reason, fmt.Sprintf(messageFmt, args...)) | ||
| } | ||
|
|
||
| func (recorder *NodeRecorder) AnnotatedEventf(object runtime.Object, | ||
| annotations map[string]string, eventtype, reason, messageFmt string, args ...interface{}) { | ||
| recorder.generateEvent(object, annotations, nil, eventtype, reason, fmt.Sprintf(messageFmt, args...)) | ||
| } | ||
|
|
||
| func (recorder *NodeRecorder) makeEvent(ref *v1.ObjectReference, annotations map[string]string, | ||
| eventtype, reason, message string) *v1.Event { | ||
| t := metav1.Time{Time: recorder.clock.Now()} | ||
| // this makes the event appear in kubectl describe node. | ||
| ref.UID = types.UID(ref.Name) | ||
| namespace := ref.Namespace | ||
| if namespace == "" { | ||
| namespace = metav1.NamespaceDefault | ||
| } | ||
| return &v1.Event{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: fmt.Sprintf("%v.%x", ref.Name, t.UnixNano()), | ||
| Namespace: namespace, | ||
| Annotations: annotations, | ||
| }, | ||
| InvolvedObject: *ref, | ||
| Reason: reason, | ||
| Message: message, | ||
| FirstTimestamp: t, | ||
| LastTimestamp: t, | ||
| Count: 1, | ||
| Type: eventtype, | ||
| } | ||
| } |
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