events: ensure the name is valid

The event Object is created from the referenced Object name, however,
there is no guarantee that the name from the referenced Object will be a
valid Event Name.

For those Objects with name not valid for an Event, generate a new valid
name using an UUID.

Kubernetes-commit: ee36b817df06f84ce1a48ef4d65ed559c3775404

tools/record/util/util.go

@@ -17,10 +17,14 @@ limitations under the License.
 package util
 
 import (
+	"fmt"
 	"net/http"
 
+	"github.com/google/uuid"
+
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
+	apimachineryvalidation "k8s.io/apimachinery/pkg/api/validation"
 )
 
 // ValidateEventType checks that eventtype is an expected type of event
@@ -38,3 +42,16 @@ func IsKeyNotFoundError(err error) bool {
 
 	return statusErr != nil && statusErr.Status().Code == http.StatusNotFound
 }
+
+// GenerateEventName generates a valid Event name from the referenced name and the passed UNIX timestamp.
+// The referenced Object name may not be a valid name for Events and cause the Event to fail
+// to be created, so we need to generate a new one in that case.
+// Ref: https://issues.k8s.io/127594
+func GenerateEventName(refName string, unixNano int64) string {
+	name := fmt.Sprintf("%s.%x", refName, unixNano)
+	if errs := apimachineryvalidation.NameIsDNSSubdomain(name, false); len(errs) > 0 {
+		// Using an uuid guarantees uniqueness and correctness
+		name = uuid.New().String()
+	}
+	return name
+}