/
event_controller.go
273 lines (232 loc) · 7.61 KB
/
event_controller.go
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package event
import (
"context"
"reflect"
"regexp"
eventloggerv1 "github.com/bakito/k8s-event-logger-operator/pkg/apis/eventlogger/v1"
"github.com/fatih/structs"
"github.com/go-logr/logr"
"github.com/operator-framework/operator-sdk/pkg/k8sutil"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
var (
log = logf.Log.WithName("controller_event")
eventLog = logf.Log.WithName("event")
)
// Add creates a new Event Controller and adds it to the Manager. The Manager will set fields on the Controller
// and Start it when the Manager is Started.
func Add(mgr manager.Manager, namespace string, name string) error {
cfg := &config{
namespace: namespace,
name: name,
}
return add(mgr, newReconciler(mgr.GetClient(), mgr.GetScheme(), cfg), cfg)
}
// newReconciler returns a new reconcile.Reconciler
func newReconciler(client client.Client, scheme *runtime.Scheme, cfg *config) reconcile.Reconciler {
return &ReconcileConfig{client: client, scheme: scheme, cfg: cfg}
}
// add adds a new Controller to mgr with r as the reconcile.Reconciler
func add(mgr manager.Manager, r reconcile.Reconciler, cfg *config) error {
// Create a new controller
c, err := controller.New("event-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource EventLogger
err = c.Watch(&source.Kind{Type: &eventloggerv1.EventLogger{}}, &handler.EnqueueRequestForObject{}, eventLoggerPredicate{cfg: cfg})
if err != nil {
return err
}
// Watch for changes to primary resource Event
p := &loggingPredicate{cfg: cfg}
p.lastVersion, err = getLatestRevision(mgr)
if err != nil {
return err
}
return c.Watch(&source.Kind{Type: &corev1.Event{}}, &handler.Funcs{}, p)
}
// blank assignment to verify that ReconcileConfig implements reconcile.Reconciler
var _ reconcile.Reconciler = &ReconcileConfig{}
// ReconcileConfig reconciles a EventLogger object
type ReconcileConfig struct {
// This client, initialized using mgr.Client() above, is a split client
// that reads objects from the cache and writes to the apiserver
client client.Client
scheme *runtime.Scheme
cfg *config
}
// Reconcile reads that state of the cluster for a EventLogger object and makes changes based on the state read
// and what is in the EventLogger.Spec
// The Controller will requeue the Request to be processed again if the returned error is non-nil or
// Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
func (r *ReconcileConfig) Reconcile(request reconcile.Request) (reconcile.Result, error) {
if r.cfg.name == "" {
r.cfg.name = request.Name
}
reqLogger := log.WithValues("Namespace", request.Namespace, "Name", request.Name)
reqLogger.V(2).Info("Reconciling event logger")
// Fetch the EventLogger cr
cr := &eventloggerv1.EventLogger{}
err := r.client.Get(context.TODO(), request.NamespacedName, cr)
if err != nil {
if errors.IsNotFound(err) {
// Request object not found, could have been deleted after reconcile request.
// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
// Return and don't requeue
r.cfg.filter = nil
reqLogger.Info("cr was deleted, removing filter")
return reconcile.Result{}, nil
}
// Error reading the object - requeue the request.
return r.updateCR(cr, reqLogger, err)
}
needUpdate := false
if !reflect.DeepEqual(r.cfg.logFields, cr.Spec.LogFields) {
r.cfg.logFields = cr.Spec.LogFields
reqLogger.WithValues("logFields", r.cfg.logFields).Info("apply new log fields")
needUpdate = true
}
newFilter := newFilter(cr.Spec)
if r.cfg.filter == nil || !r.cfg.filter.Equals(newFilter) {
r.cfg.filter = newFilter
reqLogger.WithValues("filter", r.cfg.filter).Info("apply new filter")
needUpdate = true
}
if needUpdate {
return r.updateCR(cr, reqLogger, nil)
}
return reconcile.Result{}, nil
}
func (r *ReconcileConfig) updateCR(cr *eventloggerv1.EventLogger, logger logr.Logger, err error) (reconcile.Result, error) {
updErr := cr.UpdateStatus(logger, err, r.client)
return reconcile.Result{}, updErr
}
type loggingPredicate struct {
predicate.Funcs
lastVersion string
cfg *config
}
// Create implements Predicate
func (p loggingPredicate) Create(e event.CreateEvent) bool {
return p.logEvent(e.Meta, e.Object)
}
// Delete implements Predicate
func (p loggingPredicate) Delete(e event.DeleteEvent) bool {
return p.logEvent(e.Meta, e.Object)
}
// Update implements Predicate
func (p loggingPredicate) Update(e event.UpdateEvent) bool {
return p.logEvent(e.MetaNew, e.ObjectNew)
}
func (p loggingPredicate) logEvent(mo metav1.Object, e runtime.Object) bool {
if p.cfg == nil || p.cfg.filter == nil {
return false
}
evt := e.(*corev1.Event)
if evt.ResourceVersion <= p.lastVersion {
return false
}
p.lastVersion = evt.ResourceVersion
if p.shouldLog(evt) {
var eventLogger logr.Logger
if len(p.cfg.logFields) == 0 {
eventLogger = eventLog.WithValues(
"namespace", evt.ObjectMeta.Namespace,
"name", evt.ObjectMeta.Name,
"reason", evt.Reason,
"timestamp", evt.LastTimestamp,
"type", evt.Type,
"involvedObject ", evt.InvolvedObject,
"source ", evt.Source,
)
} else {
m := structs.Map(evt)
eventLogger = eventLog
for _, lf := range p.cfg.logFields {
if len(lf.Path) > 0 {
val, ok, err := unstructured.NestedFieldNoCopy(m, lf.Path...)
if ok && err == nil {
eventLogger = eventLogger.WithValues(lf.Name, val)
}
}
}
}
eventLogger.Info(evt.Message)
}
return false
}
func (p *loggingPredicate) shouldLog(e *corev1.Event) bool {
if len(p.cfg.filter.Kinds) == 0 {
return len(p.cfg.filter.EventTypes) == 0 || p.contains(p.cfg.filter.EventTypes, e.Type)
}
k, ok := p.cfg.filter.Kinds[e.InvolvedObject.Kind]
if !ok {
return false
}
if len(k.EventTypes) != 0 && !p.contains(k.EventTypes, e.Type) {
return false
}
return p.matches(k.MatchingPatterns, k.SkipOnMatch, e.Message)
}
func (p *loggingPredicate) matches(patterns []*regexp.Regexp, skipOnMatch bool, val string) bool {
if len(patterns) == 0 {
return true
}
for _, p := range patterns {
if p.MatchString(val) {
return !skipOnMatch
}
}
return skipOnMatch
}
func (p *loggingPredicate) contains(list []string, val string) bool {
for _, v := range list {
if v == val {
return true
}
}
return false
}
func getLatestRevision(mgr manager.Manager) (string, error) {
cl, err := client.New(mgr.GetConfig(), client.Options{})
if err != nil {
return "", err
}
namespace, _ := k8sutil.GetWatchNamespace()
eventList := &corev1.EventList{}
opts := []client.ListOption{
client.Limit(0),
client.InNamespace(namespace),
}
err = cl.List(context.TODO(), eventList, opts...)
if err != nil {
return "", err
}
return eventList.ResourceVersion, nil
}
type eventLoggerPredicate struct {
predicate.Funcs
cfg *config
}
// Create implements Predicate
func (p eventLoggerPredicate) Create(e event.CreateEvent) bool {
return p.cfg.matches(e.Meta)
}
// Update implements Predicate
func (p eventLoggerPredicate) Update(e event.UpdateEvent) bool {
return p.cfg.matches(e.MetaNew)
}