controllerutil

Documentation

Overview

Package controllerutil contains utility functions for working with and implementing Controllers.

Index

• func AddFinalizer(o client.Object, finalizer string) (finalizersUpdated bool)
• func ContainsFinalizer(o client.Object, finalizer string) bool
• func HasControllerReference(object metav1.Object) bool
• func RemoveControllerReference(owner, object metav1.Object, scheme *runtime.Scheme) error
• func RemoveFinalizer(o client.Object, finalizer string) (finalizersUpdated bool)
• func RemoveOwnerReference(owner, object metav1.Object, scheme *runtime.Scheme) error
• func SetControllerReference(owner, controlled metav1.Object, scheme *runtime.Scheme) error
• func SetOwnerReference(owner, object metav1.Object, scheme *runtime.Scheme) error
• type AlreadyOwnedError
  • func (e *AlreadyOwnedError) Error() string
• type MutateFn
• type OperationResult
  • func CreateOrPatch(ctx context.Context, c client.Client, obj client.Object, f MutateFn) (OperationResult, error)
  • func CreateOrUpdate(ctx context.Context, c client.Client, obj client.Object, f MutateFn) (OperationResult, error)

Examples

• CreateOrUpdate

Functions

func AddFinalizer

func AddFinalizer(o client.Object, finalizer string) (finalizersUpdated bool)

AddFinalizer accepts an Object and adds the provided finalizer if not present. It returns an indication of whether it updated the object's list of finalizers.

func ContainsFinalizer

func ContainsFinalizer(o client.Object, finalizer string) bool

ContainsFinalizer checks an Object that the provided finalizer is present.

func HasControllerReference

func HasControllerReference(object metav1.Object) bool

HasControllerReference returns true if the object has an owner ref with controller equal to true

func RemoveControllerReference

func RemoveControllerReference(owner, object metav1.Object, scheme *runtime.Scheme) error

RemoveControllerReference removes an owner reference where the controller equals true

func RemoveFinalizer

func RemoveFinalizer(o client.Object, finalizer string) (finalizersUpdated bool)

RemoveFinalizer accepts an Object and removes the provided finalizer if present. It returns an indication of whether it updated the object's list of finalizers.

func RemoveOwnerReference

func RemoveOwnerReference(owner, object metav1.Object, scheme *runtime.Scheme) error

RemoveOwnerReference is a helper method to make sure the given object removes an owner reference to the object provided. This allows you to remove the owner to establish a new owner of the object in a subsequent call.

func SetControllerReference

func SetControllerReference(owner, controlled metav1.Object, scheme *runtime.Scheme) error

SetControllerReference sets owner as a Controller OwnerReference on controlled. This is used for garbage collection of the controlled object and for reconciling the owner object on changes to controlled (with a Watch + EnqueueRequestForOwner). Since only one OwnerReference can be a controller, it returns an error if there is another OwnerReference with Controller flag set.

func SetOwnerReference

func SetOwnerReference(owner, object metav1.Object, scheme *runtime.Scheme) error

SetOwnerReference is a helper method to make sure the given object contains an object reference to the object provided. This allows you to declare that owner has a dependency on the object without specifying it as a controller. If a reference to the same object already exists, it'll be overwritten with the newly provided version.

Types

type AlreadyOwnedError

type AlreadyOwnedError struct {
	Object metav1.Object
	Owner  metav1.OwnerReference
}

AlreadyOwnedError is an error returned if the object you are trying to assign a controller reference is already owned by another controller Object is the subject and Owner is the reference for the current owner.

func (*AlreadyOwnedError) Error

func (e *AlreadyOwnedError) Error() string

type MutateFn

type MutateFn func() error

MutateFn is a function which mutates the existing object into its desired state.

type OperationResult

type OperationResult string

OperationResult is the action result of a CreateOrUpdate call.

const (
	// OperationResultNone means that the resource has not been changed.
	OperationResultNone OperationResult = "unchanged"
	// OperationResultCreated means that a new resource is created.
	OperationResultCreated OperationResult = "created"
	// OperationResultUpdated means that an existing resource is updated.
	OperationResultUpdated OperationResult = "updated"
	// OperationResultUpdatedStatus means that an existing resource and its status is updated.
	OperationResultUpdatedStatus OperationResult = "updatedStatus"
	// OperationResultUpdatedStatusOnly means that only an existing status is updated.
	OperationResultUpdatedStatusOnly OperationResult = "updatedStatusOnly"
)

func CreateOrPatch

func CreateOrPatch(ctx context.Context, c client.Client, obj client.Object, f MutateFn) (OperationResult, error)

CreateOrPatch creates or patches the given object in the Kubernetes cluster. The object's desired state must be reconciled with the before state inside the passed in callback MutateFn.

The MutateFn is called regardless of creating or updating an object.

It returns the executed operation and an error.

Note: changes to any sub-resource other than status will be ignored. Changes to the status sub-resource will only be applied if the object already exist. To change the status on object creation, the easiest way is to requeue the object in the controller if OperationResult is OperationResultCreated

func CreateOrUpdate

func CreateOrUpdate(ctx context.Context, c client.Client, obj client.Object, f MutateFn) (OperationResult, error)

CreateOrUpdate creates or updates the given object in the Kubernetes cluster. The object's desired state must be reconciled with the existing state inside the passed in callback MutateFn.

The MutateFn is called regardless of creating or updating an object.

It returns the executed operation and an error.

Note: changes made by MutateFn to any sub-resource (status...), will be discarded.

Example

This example creates or updates an existing deployment.

package main

import (
	"context"

	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
	logf "sigs.k8s.io/controller-runtime/pkg/log"
)

var (
	log = logf.Log.WithName("controllerutil-examples")
)

// This example creates or updates an existing deployment.
func main() {
	// c is client.Client

	// Create or Update the deployment default/foo
	deploy := &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "default"}}

	op, err := controllerutil.CreateOrUpdate(context.TODO(), c, deploy, func() error {
		// Deployment selector is immutable so we set this value only if
		// a new object is going to be created
		if deploy.ObjectMeta.CreationTimestamp.IsZero() {
			deploy.Spec.Selector = &metav1.LabelSelector{
				MatchLabels: map[string]string{"foo": "bar"},
			}
		}

		// update the Deployment pod template
		deploy.Spec.Template = corev1.PodTemplateSpec{
			ObjectMeta: metav1.ObjectMeta{
				Labels: map[string]string{
					"foo": "bar",
				},
			},
			Spec: corev1.PodSpec{
				Containers: []corev1.Container{
					{
						Name:  "busybox",
						Image: "busybox",
					},
				},
			},
		}

		return nil
	})

	if err != nil {
		log.Error(err, "Deployment reconcile failed")
	} else {
		log.Info("Deployment successfully reconciled", "operation", op)
	}
}