feat: Create Kubernetes events on deletion and deletion failure

Author: TwiN

go.mod

@@ -3,50 +3,51 @@ module github.com/TwiN/k8s-ttl-controller
 go 1.19
 
 require (
+	github.com/TwiN/kevent v0.1.0
 	github.com/xhit/go-str2duration/v2 v2.0.0
 	k8s.io/api v0.25.4
 	k8s.io/apimachinery v0.25.4
 	k8s.io/client-go v0.25.4
 )
 
 require (
-	github.com/PuerkitoBio/purell v1.1.1 // indirect
-	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/emicklei/go-restful/v3 v3.8.0 // indirect
+	github.com/emicklei/go-restful/v3 v3.10.0 // indirect
 	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
 	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-openapi/jsonpointer v0.19.5 // indirect
-	github.com/go-openapi/jsonreference v0.19.5 // indirect
-	github.com/go-openapi/swag v0.19.14 // indirect
+	github.com/go-openapi/jsonreference v0.20.0 // indirect
+	github.com/go-openapi/swag v0.22.3 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/google/gnostic v0.5.7-v3refs // indirect
-	github.com/google/gofuzz v1.1.0 // indirect
+	github.com/google/gnostic v0.6.9 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/imdario/mergo v0.3.6 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/mailru/easyjson v0.7.6 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
-	golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8 // indirect
-	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
-	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
-	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect
+	golang.org/x/net v0.2.0 // indirect
+	golang.org/x/oauth2 v0.2.0 // indirect
+	golang.org/x/sys v0.2.0 // indirect
+	golang.org/x/term v0.2.0 // indirect
+	golang.org/x/text v0.4.0 // indirect
+	golang.org/x/time v0.2.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/klog/v2 v2.70.1 // indirect
-	k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect
-	k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed // indirect
+	k8s.io/klog/v2 v2.80.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20221110221610-a28e98eb7c70 // indirect
+	k8s.io/utils v0.0.0-20221108210102-8e77b1f39fe2 // indirect
 	sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
-	sigs.k8s.io/yaml v1.2.0 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
 )

go.sum

@@ -9,7 +9,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/xhit/go-str2duration/v2"
+	"github.com/TwiN/kevent"
+	str2duration "github.com/xhit/go-str2duration/v2"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime/schema"
@@ -44,7 +45,8 @@ func main() {
 		if err != nil {
 			panic("failed to create Kubernetes clients: " + err.Error())
 		}
-		if err := Reconcile(kubernetesClient, dynamicClient); err != nil {
+		eventManager := kevent.NewEventManager(kubernetesClient, "k8s-ttl-controller")
+		if err := Reconcile(kubernetesClient, dynamicClient, eventManager); err != nil {
 			log.Printf("Error during execution: %s", err.Error())
 			executionFailedCounter++
 			if executionFailedCounter > MaximumFailedExecutionBeforePanic {
@@ -62,7 +64,7 @@ func main() {
 // Reconcile loops over all resources and deletes all sub resources that have expired
 //
 // Returns an error if an execution lasts for longer than ExecutionTimeout
-func Reconcile(kubernetesClient kubernetes.Interface, dynamicClient dynamic.Interface) error {
+func Reconcile(kubernetesClient kubernetes.Interface, dynamicClient dynamic.Interface, eventManager *kevent.EventManager) error {
 	// Use Kubernetes' discovery API to retrieve all resources
 	_, resources, err := kubernetesClient.Discovery().ServerGroupsAndResources()
 	if err != nil {
@@ -78,7 +80,7 @@ func Reconcile(kubernetesClient kubernetes.Interface, dynamicClient dynamic.Inte
 		timeout <- true
 	}()
 	go func() {
-		result <- DoReconcile(dynamicClient, resources)
+		result <- DoReconcile(dynamicClient, eventManager, resources)
 	}()
 	select {
 	case <-timeout:
@@ -89,7 +91,7 @@ func Reconcile(kubernetesClient kubernetes.Interface, dynamicClient dynamic.Inte
 }
 
 // DoReconcile goes over all API resources specified, retrieves all sub resources and deletes those who have expired
-func DoReconcile(dynamicClient dynamic.Interface, resources []*metav1.APIResourceList) bool {
+func DoReconcile(dynamicClient dynamic.Interface, eventManager *kevent.EventManager, resources []*metav1.APIResourceList) bool {
 	for _, resource := range resources {
 		if len(resource.APIResources) == 0 {
 			continue
@@ -139,13 +141,16 @@ func DoReconcile(dynamicClient dynamic.Interface, resources []*metav1.APIResourc
 					}
 					ttlExpired := time.Now().After(item.GetCreationTimestamp().Add(ttlInDuration))
 					if ttlExpired {
-						log.Printf("[%s/%s] is configured with a TTL of %s, which means it has expired %s ago", apiResource.Name, item.GetName(), ttl, time.Since(item.GetCreationTimestamp().Add(ttlInDuration)).Round(time.Second))
+						durationSinceExpired := time.Since(item.GetCreationTimestamp().Add(ttlInDuration)).Round(time.Second)
+						log.Printf("[%s/%s] is configured with a TTL of %s, which means it has expired %s ago", apiResource.Name, item.GetName(), ttl, durationSinceExpired)
 						err := dynamicClient.Resource(gvr).Namespace(item.GetNamespace()).Delete(context.TODO(), item.GetName(), metav1.DeleteOptions{})
 						if err != nil {
 							log.Printf("[%s/%s] failed to delete: %s\n", apiResource.Name, item.GetName(), err)
+							eventManager.Create(item.GetNamespace(), item.GetKind(), item.GetName(), "FailedToDeleteExpiredTTL", "Unable to delete expired resource:"+err.Error(), true)
 							// XXX: Should we retry with GracePeriodSeconds set to &0 to force immediate deletion after the first attempt failed?
 						} else {
 							log.Printf("[%s/%s] deleted", apiResource.Name, item.GetName())
+							eventManager.Create(item.GetNamespace(), item.GetKind(), item.GetName(), "DeletedExpiredTTL", "Deleted resource because "+ttl+" or more has elapsed", false)
 						}
 						// Cool off a tiny bit to avoid hitting the API too often
 						time.Sleep(ThrottleDuration)