mirror of
https://github.com/ceph/ceph-csi.git
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431 lines
15 KiB
Go
431 lines
15 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package events
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import (
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"context"
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"fmt"
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"os"
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"sync"
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"time"
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corev1 "k8s.io/api/core/v1"
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eventsv1 "k8s.io/api/events/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/json"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/strategicpatch"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/apimachinery/pkg/watch"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/kubernetes/scheme"
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typedv1core "k8s.io/client-go/kubernetes/typed/core/v1"
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typedeventsv1 "k8s.io/client-go/kubernetes/typed/events/v1"
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restclient "k8s.io/client-go/rest"
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"k8s.io/client-go/tools/record"
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"k8s.io/client-go/tools/record/util"
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"k8s.io/klog/v2"
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"k8s.io/utils/clock"
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)
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const (
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maxTriesPerEvent = 12
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finishTime = 6 * time.Minute
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refreshTime = 30 * time.Minute
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maxQueuedEvents = 1000
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)
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var defaultSleepDuration = 10 * time.Second
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// TODO: validate impact of copying and investigate hashing
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type eventKey struct {
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eventType string
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action string
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reason string
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reportingController string
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reportingInstance string
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regarding corev1.ObjectReference
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related corev1.ObjectReference
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}
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type eventBroadcasterImpl struct {
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*watch.Broadcaster
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mu sync.Mutex
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eventCache map[eventKey]*eventsv1.Event
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sleepDuration time.Duration
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sink EventSink
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}
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// EventSinkImpl wraps EventsV1Interface to implement EventSink.
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// TODO: this makes it easier for testing purpose and masks the logic of performing API calls.
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// Note that rollbacking to raw clientset should also be transparent.
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type EventSinkImpl struct {
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Interface typedeventsv1.EventsV1Interface
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}
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// 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.
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func (e *EventSinkImpl) Create(event *eventsv1.Event) (*eventsv1.Event, error) {
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if event.Namespace == "" {
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return nil, fmt.Errorf("can't create an event with empty namespace")
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}
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return e.Interface.Events(event.Namespace).Create(context.TODO(), event, metav1.CreateOptions{})
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}
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// 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.
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func (e *EventSinkImpl) Update(event *eventsv1.Event) (*eventsv1.Event, error) {
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if event.Namespace == "" {
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return nil, fmt.Errorf("can't update an event with empty namespace")
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}
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return e.Interface.Events(event.Namespace).Update(context.TODO(), event, metav1.UpdateOptions{})
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}
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// Patch applies the patch and returns the patched event, and an error, if there is any.
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func (e *EventSinkImpl) Patch(event *eventsv1.Event, data []byte) (*eventsv1.Event, error) {
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if event.Namespace == "" {
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return nil, fmt.Errorf("can't patch an event with empty namespace")
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}
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return e.Interface.Events(event.Namespace).Patch(context.TODO(), event.Name, types.StrategicMergePatchType, data, metav1.PatchOptions{})
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}
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// NewBroadcaster Creates a new event broadcaster.
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func NewBroadcaster(sink EventSink) EventBroadcaster {
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return newBroadcaster(sink, defaultSleepDuration, map[eventKey]*eventsv1.Event{})
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}
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// NewBroadcasterForTest Creates a new event broadcaster for test purposes.
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func newBroadcaster(sink EventSink, sleepDuration time.Duration, eventCache map[eventKey]*eventsv1.Event) EventBroadcaster {
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return &eventBroadcasterImpl{
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Broadcaster: watch.NewBroadcaster(maxQueuedEvents, watch.DropIfChannelFull),
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eventCache: eventCache,
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sleepDuration: sleepDuration,
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sink: sink,
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}
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}
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func (e *eventBroadcasterImpl) Shutdown() {
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e.Broadcaster.Shutdown()
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}
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// refreshExistingEventSeries refresh events TTL
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func (e *eventBroadcasterImpl) refreshExistingEventSeries() {
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// TODO: Investigate whether lock contention won't be a problem
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e.mu.Lock()
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defer e.mu.Unlock()
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for isomorphicKey, event := range e.eventCache {
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if event.Series != nil {
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if recordedEvent, retry := recordEvent(e.sink, event); !retry {
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if recordedEvent != nil {
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e.eventCache[isomorphicKey] = recordedEvent
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}
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}
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}
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}
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}
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// finishSeries checks if a series has ended and either:
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// - write final count to the apiserver
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// - delete a singleton event (i.e. series field is nil) from the cache
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func (e *eventBroadcasterImpl) finishSeries() {
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// TODO: Investigate whether lock contention won't be a problem
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e.mu.Lock()
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defer e.mu.Unlock()
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for isomorphicKey, event := range e.eventCache {
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eventSerie := event.Series
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if eventSerie != nil {
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if eventSerie.LastObservedTime.Time.Before(time.Now().Add(-finishTime)) {
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if _, retry := recordEvent(e.sink, event); !retry {
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delete(e.eventCache, isomorphicKey)
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}
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}
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} else if event.EventTime.Time.Before(time.Now().Add(-finishTime)) {
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delete(e.eventCache, isomorphicKey)
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}
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}
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}
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// NewRecorder returns an EventRecorder that records events with the given event source.
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func (e *eventBroadcasterImpl) NewRecorder(scheme *runtime.Scheme, reportingController string) EventRecorder {
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hostname, _ := os.Hostname()
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reportingInstance := reportingController + "-" + hostname
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return &recorderImpl{scheme, reportingController, reportingInstance, e.Broadcaster, clock.RealClock{}}
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}
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func (e *eventBroadcasterImpl) recordToSink(event *eventsv1.Event, clock clock.Clock) {
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// Make a copy before modification, because there could be multiple listeners.
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eventCopy := event.DeepCopy()
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go func() {
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evToRecord := func() *eventsv1.Event {
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e.mu.Lock()
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defer e.mu.Unlock()
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eventKey := getKey(eventCopy)
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isomorphicEvent, isIsomorphic := e.eventCache[eventKey]
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if isIsomorphic {
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if isomorphicEvent.Series != nil {
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isomorphicEvent.Series.Count++
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isomorphicEvent.Series.LastObservedTime = metav1.MicroTime{Time: clock.Now()}
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return nil
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}
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isomorphicEvent.Series = &eventsv1.EventSeries{
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Count: 2,
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LastObservedTime: metav1.MicroTime{Time: clock.Now()},
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}
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// Make a copy of the Event to make sure that recording it
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// doesn't mess with the object stored in cache.
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return isomorphicEvent.DeepCopy()
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}
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e.eventCache[eventKey] = eventCopy
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// Make a copy of the Event to make sure that recording it doesn't
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// mess with the object stored in cache.
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return eventCopy.DeepCopy()
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}()
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if evToRecord != nil {
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// TODO: Add a metric counting the number of recording attempts
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e.attemptRecording(evToRecord)
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// We don't want the new recorded Event to be reflected in the
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// client's cache because server-side mutations could mess with the
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// aggregation mechanism used by the client.
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}
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}()
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}
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func (e *eventBroadcasterImpl) attemptRecording(event *eventsv1.Event) *eventsv1.Event {
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tries := 0
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for {
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if recordedEvent, retry := recordEvent(e.sink, event); !retry {
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return recordedEvent
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}
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tries++
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if tries >= maxTriesPerEvent {
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klog.Errorf("Unable to write event '%#v' (retry limit exceeded!)", event)
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return nil
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}
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// Randomize sleep so that various clients won't all be
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// synced up if the master goes down.
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time.Sleep(wait.Jitter(e.sleepDuration, 0.25))
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}
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}
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func recordEvent(sink EventSink, event *eventsv1.Event) (*eventsv1.Event, bool) {
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var newEvent *eventsv1.Event
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var err error
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isEventSeries := event.Series != nil
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if isEventSeries {
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patch, patchBytesErr := createPatchBytesForSeries(event)
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if patchBytesErr != nil {
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klog.Errorf("Unable to calculate diff, no merge is possible: %v", patchBytesErr)
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return nil, false
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}
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newEvent, err = sink.Patch(event, patch)
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}
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// Update can fail because the event may have been removed and it no longer exists.
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if !isEventSeries || (isEventSeries && util.IsKeyNotFoundError(err)) {
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// Making sure that ResourceVersion is empty on creation
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event.ResourceVersion = ""
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newEvent, err = sink.Create(event)
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}
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if err == nil {
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return newEvent, false
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}
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// If we can't contact the server, then hold everything while we keep trying.
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// Otherwise, something about the event is malformed and we should abandon it.
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switch err.(type) {
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case *restclient.RequestConstructionError:
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// We will construct the request the same next time, so don't keep trying.
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klog.Errorf("Unable to construct event '%#v': '%v' (will not retry!)", event, err)
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return nil, false
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case *errors.StatusError:
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if errors.IsAlreadyExists(err) {
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// If we tried to create an Event from an EventSerie, it means that
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// the original Patch request failed because the Event we were
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// trying to patch didn't exist. If the creation failed because the
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// Event now exists, it is safe to retry. This occurs when a new
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// Event is emitted twice in a very short period of time.
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if isEventSeries {
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return nil, true
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}
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klog.V(5).Infof("Server rejected event '%#v': '%v' (will not retry!)", event, err)
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} else {
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klog.Errorf("Server rejected event '%#v': '%v' (will not retry!)", event, err)
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}
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return nil, false
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case *errors.UnexpectedObjectError:
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// We don't expect this; it implies the server's response didn't match a
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// known pattern. Go ahead and retry.
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default:
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// This case includes actual http transport errors. Go ahead and retry.
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}
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klog.Errorf("Unable to write event: '%v' (may retry after sleeping)", err)
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return nil, true
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}
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func createPatchBytesForSeries(event *eventsv1.Event) ([]byte, error) {
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oldEvent := event.DeepCopy()
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oldEvent.Series = nil
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oldData, err := json.Marshal(oldEvent)
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if err != nil {
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return nil, err
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}
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newData, err := json.Marshal(event)
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if err != nil {
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return nil, err
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}
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return strategicpatch.CreateTwoWayMergePatch(oldData, newData, eventsv1.Event{})
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}
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func getKey(event *eventsv1.Event) eventKey {
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key := eventKey{
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eventType: event.Type,
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action: event.Action,
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reason: event.Reason,
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reportingController: event.ReportingController,
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reportingInstance: event.ReportingInstance,
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regarding: event.Regarding,
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}
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if event.Related != nil {
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key.related = *event.Related
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}
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return key
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}
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// StartStructuredLogging starts sending events received from this EventBroadcaster to the structured logging function.
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// The return value can be ignored or used to stop recording, if desired.
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// TODO: this function should also return an error.
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func (e *eventBroadcasterImpl) StartStructuredLogging(verbosity klog.Level) func() {
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stopWatcher, err := e.StartEventWatcher(
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func(obj runtime.Object) {
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event, ok := obj.(*eventsv1.Event)
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if !ok {
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klog.Errorf("unexpected type, expected eventsv1.Event")
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return
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}
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klog.V(verbosity).InfoS("Event occurred", "object", klog.KRef(event.Regarding.Namespace, event.Regarding.Name), "kind", event.Regarding.Kind, "apiVersion", event.Regarding.APIVersion, "type", event.Type, "reason", event.Reason, "action", event.Action, "note", event.Note)
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})
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if err != nil {
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klog.Errorf("failed to start event watcher: '%v'", err)
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return func() {}
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}
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return stopWatcher
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}
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// StartEventWatcher starts sending events received from this EventBroadcaster to the given event handler function.
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// The return value is used to stop recording
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func (e *eventBroadcasterImpl) StartEventWatcher(eventHandler func(event runtime.Object)) (func(), error) {
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watcher, err := e.Watch()
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if err != nil {
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klog.Errorf("Unable start event watcher: '%v' (will not retry!)", err)
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return nil, err
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}
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go func() {
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defer utilruntime.HandleCrash()
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for {
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watchEvent, ok := <-watcher.ResultChan()
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if !ok {
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return
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}
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eventHandler(watchEvent.Object)
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}
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}()
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return watcher.Stop, nil
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}
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func (e *eventBroadcasterImpl) startRecordingEvents(stopCh <-chan struct{}) error {
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eventHandler := func(obj runtime.Object) {
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event, ok := obj.(*eventsv1.Event)
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if !ok {
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klog.Errorf("unexpected type, expected eventsv1.Event")
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return
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}
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e.recordToSink(event, clock.RealClock{})
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}
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stopWatcher, err := e.StartEventWatcher(eventHandler)
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if err != nil {
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return err
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}
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go func() {
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<-stopCh
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stopWatcher()
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}()
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return nil
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}
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// StartRecordingToSink starts sending events received from the specified eventBroadcaster to the given sink.
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func (e *eventBroadcasterImpl) StartRecordingToSink(stopCh <-chan struct{}) {
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go wait.Until(e.refreshExistingEventSeries, refreshTime, stopCh)
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go wait.Until(e.finishSeries, finishTime, stopCh)
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err := e.startRecordingEvents(stopCh)
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if err != nil {
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klog.Errorf("unexpected type, expected eventsv1.Event")
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return
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}
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}
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type eventBroadcasterAdapterImpl struct {
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coreClient typedv1core.EventsGetter
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coreBroadcaster record.EventBroadcaster
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eventsv1Client typedeventsv1.EventsV1Interface
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eventsv1Broadcaster EventBroadcaster
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}
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// NewEventBroadcasterAdapter creates a wrapper around new and legacy broadcasters to simplify
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// migration of individual components to the new Event API.
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func NewEventBroadcasterAdapter(client clientset.Interface) EventBroadcasterAdapter {
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eventClient := &eventBroadcasterAdapterImpl{}
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if _, err := client.Discovery().ServerResourcesForGroupVersion(eventsv1.SchemeGroupVersion.String()); err == nil {
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eventClient.eventsv1Client = client.EventsV1()
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eventClient.eventsv1Broadcaster = NewBroadcaster(&EventSinkImpl{Interface: eventClient.eventsv1Client})
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}
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// Even though there can soon exist cases when coreBroadcaster won't really be needed,
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// we create it unconditionally because its overhead is minor and will simplify using usage
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// patterns of this library in all components.
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eventClient.coreClient = client.CoreV1()
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eventClient.coreBroadcaster = record.NewBroadcaster()
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return eventClient
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}
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// StartRecordingToSink starts sending events received from the specified eventBroadcaster to the given sink.
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func (e *eventBroadcasterAdapterImpl) StartRecordingToSink(stopCh <-chan struct{}) {
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if e.eventsv1Broadcaster != nil && e.eventsv1Client != nil {
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e.eventsv1Broadcaster.StartRecordingToSink(stopCh)
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}
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if e.coreBroadcaster != nil && e.coreClient != nil {
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e.coreBroadcaster.StartRecordingToSink(&typedv1core.EventSinkImpl{Interface: e.coreClient.Events("")})
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}
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}
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func (e *eventBroadcasterAdapterImpl) NewRecorder(name string) EventRecorder {
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if e.eventsv1Broadcaster != nil && e.eventsv1Client != nil {
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return e.eventsv1Broadcaster.NewRecorder(scheme.Scheme, name)
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}
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return record.NewEventRecorderAdapter(e.DeprecatedNewLegacyRecorder(name))
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}
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func (e *eventBroadcasterAdapterImpl) DeprecatedNewLegacyRecorder(name string) record.EventRecorder {
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return e.coreBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: name})
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}
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func (e *eventBroadcasterAdapterImpl) Shutdown() {
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if e.coreBroadcaster != nil {
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e.coreBroadcaster.Shutdown()
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}
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if e.eventsv1Broadcaster != nil {
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e.eventsv1Broadcaster.Shutdown()
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}
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}
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