github.com/oam-dev/kubevela@v1.9.11/pkg/oam/util/helper.go

/*
Copyright 2021 The KubeVela Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package util

import (
	"context"
	"encoding/json"
	"fmt"
	"hash"
	"hash/fnv"
	"strconv"
	"strings"

	"github.com/davecgh/go-spew/spew"
	"github.com/pkg/errors"
	corev1 "k8s.io/api/core/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/api/meta"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/apimachinery/pkg/util/rand"
	"k8s.io/apimachinery/pkg/util/validation"
	"sigs.k8s.io/controller-runtime/pkg/client"

	"github.com/oam-dev/kubevela/apis/core.oam.dev/common"
	"github.com/oam-dev/kubevela/apis/core.oam.dev/condition"
	"github.com/oam-dev/kubevela/apis/core.oam.dev/v1beta1"
	types2 "github.com/oam-dev/kubevela/apis/types"
	"github.com/oam-dev/kubevela/pkg/oam"
)

const (
	// TraitPrefixKey is prefix of trait name
	TraitPrefixKey = "trait"

	// Dummy used for dummy definition
	Dummy = "dummy"

	// DummyTraitMessage is a message for trait which don't have definition found
	DummyTraitMessage = "No TraitDefinition found, all framework capabilities will work as default"
)

const (
	// ErrReconcileErrInCondition indicates one or more error occurs and are recorded in status conditions
	ErrReconcileErrInCondition = "object level reconcile error, type: %q, msg: %q"
	// ErrUpdateStatus is the error while applying status.
	ErrUpdateStatus = "cannot apply status"

	// ErrStoreCapabilityInConfigMap is the error while storing capability in ConfigMap
	ErrStoreCapabilityInConfigMap = "cannot store capability %s in ConfigMap: %v"
	// ErrGenerateOpenAPIV2JSONSchemaForCapability is the error while generating OpenAPI v3 schema
	ErrGenerateOpenAPIV2JSONSchemaForCapability = "cannot generate OpenAPI v3 JSON schema for capability %s: %v"
	// ErrUpdateCapabilityInConfigMap is the error while creating or updating a capability
	ErrUpdateCapabilityInConfigMap = "cannot create or update capability %s in ConfigMap: %v"

	// ErrUpdateComponentDefinition is the error while update ComponentDefinition
	ErrUpdateComponentDefinition = "cannot update ComponentDefinition %s: %v"
	// ErrUpdateTraitDefinition is the error while update TraitDefinition
	ErrUpdateTraitDefinition = "cannot update TraitDefinition %s: %v"
	// ErrUpdateStepDefinition is the error while update WorkflowStepDefinition
	ErrUpdateStepDefinition = "cannot update WorkflowStepDefinition %s: %v"
	// ErrUpdatePolicyDefinition is the error while update PolicyDefinition
	ErrUpdatePolicyDefinition = "cannot update PolicyDefinition %s: %v"
	// ErrUpdateWorkflowStepDefinition is the error while update WorkflowStepDefinition
	ErrUpdateWorkflowStepDefinition = "cannot update WorkflowStepDefinition %s: %v"

	// ErrCreateConvertedWorklaodDefinition is the error while apply a WorkloadDefinition
	ErrCreateConvertedWorklaodDefinition = "cannot create converted WorkloadDefinition %s: %v"

	// ErrRefreshPackageDiscover is the error while refresh PackageDiscover
	ErrRefreshPackageDiscover = "cannot discover the open api of the CRD : %v"

	// ErrGenerateDefinitionRevision is the error while generate DefinitionRevision
	ErrGenerateDefinitionRevision = "cannot generate DefinitionRevision of %s: %v"
	// ErrCreateDefinitionRevision is the error while create or update DefinitionRevision
	ErrCreateDefinitionRevision = "cannot create DefinitionRevision %s: %v"
)

// WorkloadType describe the workload type of ComponentDefinition
type WorkloadType string

const (
	// ComponentDef describe a workload of Defined by ComponentDefinition
	ComponentDef WorkloadType = "ComponentDef"

	// KubeDef describe a workload refer to raw K8s resource
	KubeDef WorkloadType = "KubeDef"

	// HELMDef describe a workload refer to HELM
	HELMDef WorkloadType = "HelmDef"

	// TerraformDef describes a workload refer to Terraform
	TerraformDef WorkloadType = "TerraformDef"

	// ReferWorkload describe an existing workload
	ReferWorkload WorkloadType = "ReferWorkload"
)

type namespaceContextKey int

const (
	// AppDefinitionNamespace is context key to define app namespace
	AppDefinitionNamespace namespaceContextKey = iota
	// XDefinitionNamespace is context key to define the namespace, which x-definition(Component/Trait) is installed to
	XDefinitionNamespace
)

// A ConditionedObject is an Object type with condition field
type ConditionedObject interface {
	client.Object

	oam.Conditioned
}

// ErrBadRevision represents an error when the revision name is not standardized
const ErrBadRevision = "bad revision name"

// GetDefinitionNamespaceWithCtx will get namespace from context, it will try get `AppDefinitionNamespace` key, if not found,
// will use default system level namespace defined in `systemvar.SystemDefinitionNamespace`
func GetDefinitionNamespaceWithCtx(ctx context.Context) string {
	var appNs string
	if app := ctx.Value(AppDefinitionNamespace); app == nil {
		appNs = oam.SystemDefinitionNamespace
	} else {
		appNs = app.(string)
	}
	return appNs
}

// GetXDefinitionNamespaceWithCtx will get namespace from context, it will try get `XDefinitionNamespace` key, if not found,
// will use default system level namespace defined in `vela-system`
func GetXDefinitionNamespaceWithCtx(ctx context.Context) string {
	if xNs, _ := ctx.Value(XDefinitionNamespace).(string); len(xNs) > 0 {
		return xNs
	}
	return oam.SystemDefinitionNamespace
}

// SetNamespaceInCtx set app namespace in context,
// Sometimes webhook handler may receive a request that appNs is empty string, and will cause error when search definition
// So if namespace is empty, it will use `default` namespace by default.
func SetNamespaceInCtx(ctx context.Context, namespace string) context.Context {
	if namespace == "" {
		// compatible with some webhook handlers that maybe receive empty string as app namespace which means `default` namespace
		namespace = types2.DefaultAppNamespace
	}
	ctx = context.WithValue(ctx, AppDefinitionNamespace, namespace)
	return ctx
}

// SetXDefinitionNamespaceInCtx set x-definition namespace in context,
// Sometimes x-definition is installed to customized namespace
// So it is empty, it will use `vela-system` namespace by default.
func SetXDefinitionNamespaceInCtx(ctx context.Context, namespace string) context.Context {
	if namespace == "" {
		namespace = oam.SystemDefinitionNamespace
	}
	ctx = context.WithValue(ctx, XDefinitionNamespace, namespace)
	return ctx
}

// GetDefinition get definition from two level namespace
func GetDefinition(ctx context.Context, cli client.Reader, definition client.Object, definitionName string) error {
	appNs := GetDefinitionNamespaceWithCtx(ctx)
	if err := cli.Get(ctx, types.NamespacedName{Name: definitionName, Namespace: appNs}, definition); err != nil {
		if !apierrors.IsNotFound(err) {
			return err
		}

		for _, ns := range []string{GetXDefinitionNamespaceWithCtx(ctx), oam.SystemDefinitionNamespace} {
			err = GetDefinitionFromNamespace(ctx, cli, definition, definitionName, ns)
			if !apierrors.IsNotFound(err) {
				return err
			}
		}
		return err
	}
	return nil
}

// GetDefinitionFromNamespace get definition from namespace.
func GetDefinitionFromNamespace(ctx context.Context, cli client.Reader, definition client.Object, definitionName, namespace string) error {
	if err := cli.Get(ctx, types.NamespacedName{Name: definitionName, Namespace: namespace}, definition); err != nil {
		if apierrors.IsNotFound(err) {
			// compatibility code for old clusters those definition crd is cluster scope
			var newErr error
			if newErr = cli.Get(ctx, types.NamespacedName{Name: definitionName}, definition); checkRequestNamespaceError(newErr) {
				return err
			}
			return newErr
		}
		return err
	}
	return nil
}

// GetCapabilityDefinition can get different versions of ComponentDefinition/TraitDefinition
func GetCapabilityDefinition(ctx context.Context, cli client.Reader, definition client.Object,
	definitionName string) error {
	isLatestRevision, defRev, err := fetchDefinitionRev(ctx, cli, definitionName)
	if err != nil {
		return err
	}
	if isLatestRevision {
		return GetDefinition(ctx, cli, definition, definitionName)
	}
	switch def := definition.(type) {
	case *v1beta1.ComponentDefinition:
		*def = defRev.Spec.ComponentDefinition
	case *v1beta1.TraitDefinition:
		*def = defRev.Spec.TraitDefinition
	case *v1beta1.PolicyDefinition:
		*def = defRev.Spec.PolicyDefinition
	case *v1beta1.WorkflowStepDefinition:
		*def = defRev.Spec.WorkflowStepDefinition
	default:
	}
	return nil
}

func fetchDefinitionRev(ctx context.Context, cli client.Reader, definitionName string) (bool, *v1beta1.DefinitionRevision, error) {
	// if the component's type doesn't contain '@' means user want to use the latest Definition.
	if !strings.Contains(definitionName, "@") {
		return true, nil, nil
	}

	defRevName, err := ConvertDefinitionRevName(definitionName)
	if err != nil {
		return false, nil, err
	}
	defRev := new(v1beta1.DefinitionRevision)
	if err := GetDefinition(ctx, cli, defRev, defRevName); err != nil {
		return false, nil, err
	}
	return false, defRev, nil
}

// ConvertDefinitionRevName can help convert definition type defined in Application to DefinitionRevision Name
// e.g., worker@v1.3.1 will be convert to worker-v1.3.1
func ConvertDefinitionRevName(definitionName string) (string, error) {
	splits := strings.Split(definitionName, "@v")
	if len(splits) == 1 || len(splits[0]) == 0 {
		errs := validation.IsQualifiedName(definitionName)
		if len(errs) != 0 {
			return definitionName, errors.Errorf("invalid definitionRevision name %s:%s", definitionName, strings.Join(errs, ","))
		}
		return definitionName, nil
	}

	defName := splits[0]
	revisionName := strings.TrimPrefix(definitionName, fmt.Sprintf("%s@v", defName))
	defRevName := fmt.Sprintf("%s-v%s", defName, revisionName)
	errs := validation.IsQualifiedName(defRevName)
	if len(errs) != 0 {
		return defRevName, errors.Errorf("invalid definitionRevision name %s:%s", defName, strings.Join(errs, ","))
	}
	return defRevName, nil
}

// when get a namespaced scope object without namespace, would get an error request namespace
func checkRequestNamespaceError(err error) bool {
	return err != nil && err.Error() == "an empty namespace may not be set when a resource name is provided"
}

// EndReconcileWithNegativeCondition is used to handle reconcile failure for a conditioned resource.
// It will make ctrl-mgr to requeue the resource through patching changed conditions or returning
// an error.
// It should not handle reconcile success with positive conditions, otherwise it will trigger
// infinite requeue.
func EndReconcileWithNegativeCondition(ctx context.Context, r client.StatusClient, workload ConditionedObject,
	condition ...condition.Condition) error {
	if len(condition) == 0 {
		return nil
	}
	workloadPatch := client.MergeFrom(workload.DeepCopyObject().(client.Object))
	conditionIsChanged := IsConditionChanged(condition, workload)
	workload.SetConditions(condition...)
	if err := r.Status().Patch(ctx, workload, workloadPatch, client.FieldOwner(workload.GetUID())); err != nil {
		return errors.Wrap(err, ErrUpdateStatus)
	}
	if conditionIsChanged {
		// if any condition is changed, patching status can trigger requeue the resource and we should return nil to
		// avoid requeue it again
		return nil
	}
	// if no condition is changed, patching status can not trigger requeue, so we must return an error to
	// requeue the resource
	return errors.Errorf(ErrReconcileErrInCondition, condition[0].Type, condition[0].Message)
}

// PatchCondition will patch status with condition and return, it generally used by cases which don't want to reconcile after patch
func PatchCondition(ctx context.Context, r client.StatusClient, workload ConditionedObject,
	condition ...condition.Condition) error {
	if len(condition) == 0 {
		return nil
	}
	workloadPatch := client.MergeFrom(workload.DeepCopyObject().(client.Object))
	workload.SetConditions(condition...)
	return r.Status().Patch(ctx, workload, workloadPatch, client.FieldOwner(workload.GetUID()))
}

// IsConditionChanged will check if conditions in workload are changed compare to newCondition
func IsConditionChanged(newCondition []condition.Condition, workload ConditionedObject) bool {
	var conditionIsChanged bool
	for _, newCond := range newCondition {
		// NOTE(roywang) an implicit rule here: condition type is unique in an object's conditions
		// if this rule is changed in the future, we must revise below logic correspondingly
		existingCond := workload.GetCondition(newCond.Type)

		if !existingCond.Equal(newCond) {
			conditionIsChanged = true
			break
		}
	}
	return conditionIsChanged
}

// EndReconcileWithPositiveCondition is used to handle reconcile success for a conditioned resource.
// It should only accept positive condition which means no need to requeue the resource.
func EndReconcileWithPositiveCondition(ctx context.Context, r client.StatusClient, workload ConditionedObject,
	condition ...condition.Condition) error {
	workloadPatch := client.MergeFrom(workload.DeepCopyObject().(client.Object))
	workload.SetConditions(condition...)
	return errors.Wrap(
		r.Status().Patch(ctx, workload, workloadPatch, client.FieldOwner(workload.GetUID())),
		ErrUpdateStatus)
}

// A metaObject is a Kubernetes object that has label and annotation
type labelAnnotationObject interface {
	GetLabels() map[string]string
	SetLabels(labels map[string]string)
	GetAnnotations() map[string]string
	SetAnnotations(annotations map[string]string)
}

// PassLabelAndAnnotation passes through labels and annotation objectMeta from the parent to the child object
// when annotation or labels has conflicts, the parentObj will override the childObj.
func PassLabelAndAnnotation(parentObj, childObj labelAnnotationObject) {
	// pass app-config labels
	childObj.SetLabels(MergeMapOverrideWithDst(childObj.GetLabels(), parentObj.GetLabels()))
	// pass app-config annotation
	childObj.SetAnnotations(MergeMapOverrideWithDst(childObj.GetAnnotations(), parentObj.GetAnnotations()))
}

// RemoveLabels removes keys that contains in the removekeys slice from the label
func RemoveLabels(o labelAnnotationObject, removeKeys []string) {
	exist := o.GetLabels()
	for _, key := range removeKeys {
		delete(exist, key)
	}
	o.SetLabels(exist)
}

// RemoveAnnotations removes keys that contains in the removekeys slice from the annotation
func RemoveAnnotations(o labelAnnotationObject, removeKeys []string) {
	exist := o.GetAnnotations()
	for _, key := range removeKeys {
		delete(exist, key)
	}
	o.SetAnnotations(exist)
}

// GetDefinitionName return the Definition name of any resources
// the format of the definition of a resource is <kind plurals>.<group>
// Now the definition name of a resource could also be defined as `definition.oam.dev/name` in `metadata.annotations`
// typeLabel specified which Definition it is, if specified, will directly get definition from label.
func GetDefinitionName(mapper meta.RESTMapper, u *unstructured.Unstructured, typeLabel string) (string, error) {
	if typeLabel != "" {
		if labels := u.GetLabels(); labels != nil {
			if definitionName, ok := labels[typeLabel]; ok {
				return definitionName, nil
			}
		}
	}
	groupVersion, err := schema.ParseGroupVersion(u.GetAPIVersion())
	if err != nil {
		return "", err
	}
	mapping, err := mapper.RESTMapping(schema.GroupKind{Group: groupVersion.Group, Kind: u.GetKind()}, groupVersion.Version)
	if err != nil {
		return "", err
	}
	return mapping.Resource.Resource + "." + groupVersion.Group, nil
}

// GetGVKFromDefinition help get Group Version Kind from DefinitionReference
func GetGVKFromDefinition(mapper meta.RESTMapper, definitionRef common.DefinitionReference) (metav1.GroupVersionKind, error) {
	// if given definitionRef is empty or it's a dummy definition, return an empty GVK
	// NOTE currently, only TraitDefinition is allowed to omit definitionRef conditionally.
	if len(definitionRef.Name) < 1 || definitionRef.Name == Dummy {
		return metav1.GroupVersionKind{}, nil
	}
	var gvk metav1.GroupVersionKind
	groupResource := schema.ParseGroupResource(definitionRef.Name)
	gvr := schema.GroupVersionResource{Group: groupResource.Group, Resource: groupResource.Resource, Version: definitionRef.Version}
	kinds, err := mapper.KindsFor(gvr)
	if err != nil {
		return gvk, err
	}
	if len(kinds) < 1 {
		return gvk, &meta.NoResourceMatchError{
			PartialResource: gvr,
		}
	}
	return metav1.GroupVersionKind{
		Group:   kinds[0].Group,
		Kind:    kinds[0].Kind,
		Version: kinds[0].Version,
	}, nil
}

// ConvertWorkloadGVK2Definition help convert a GVK to DefinitionReference
func ConvertWorkloadGVK2Definition(mapper meta.RESTMapper, def common.WorkloadGVK) (common.DefinitionReference, error) {
	var reference common.DefinitionReference
	gv, err := schema.ParseGroupVersion(def.APIVersion)
	if err != nil {
		return reference, err
	}
	gvk := gv.WithKind(def.Kind)
	mappings, err := mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
	if err != nil {
		return reference, err
	}
	gvr := mappings.Resource
	reference.Version = gvr.Version
	reference.Name = gvr.GroupResource().String()
	return reference, nil
}

// GetObjectsGivenGVKAndLabels fetches the kubernetes object given its gvk and labels by list API
func GetObjectsGivenGVKAndLabels(ctx context.Context, cli client.Reader,
	gvk schema.GroupVersionKind, namespace string, labels map[string]string) (*unstructured.UnstructuredList, error) {
	unstructuredObjList := &unstructured.UnstructuredList{}
	apiVersion := metav1.GroupVersion{
		Group:   gvk.Group,
		Version: gvk.Version,
	}.String()
	unstructuredObjList.SetAPIVersion(apiVersion)
	unstructuredObjList.SetKind(gvk.Kind)
	if err := cli.List(ctx, unstructuredObjList, client.MatchingLabels(labels), client.InNamespace(namespace)); err != nil {
		return nil, errors.Wrap(err, fmt.Sprintf("failed to get obj with labels %+v and gvk %+v ", labels, gvk))
	}
	return unstructuredObjList, nil
}

// GetObjectGivenGVKAndName fetches the kubernetes object given its gvk and name
func GetObjectGivenGVKAndName(ctx context.Context, client client.Reader,
	gvk schema.GroupVersionKind, namespace, name string) (*unstructured.Unstructured, error) {
	obj := &unstructured.Unstructured{}
	apiVersion := metav1.GroupVersion{
		Group:   gvk.Group,
		Version: gvk.Version,
	}.String()
	obj.SetAPIVersion(apiVersion)
	obj.SetKind(gvk.Kind)
	err := client.Get(ctx, types.NamespacedName{
		Namespace: namespace,
		Name:      name},
		obj)
	if err != nil {
		return nil, errors.Wrap(err, fmt.Sprintf("failed to get obj %s with gvk %+v ", name, gvk))
	}
	return obj, nil
}

// Object2Unstructured converts an object to an unstructured struct
func Object2Unstructured(obj interface{}) (*unstructured.Unstructured, error) {
	objMap, err := Object2Map(obj)
	if err != nil {
		return nil, err
	}
	return &unstructured.Unstructured{
		Object: objMap,
	}, nil
}

// RawExtension2Unstructured converts a rawExtension to an unstructured struct
func RawExtension2Unstructured(raw *runtime.RawExtension) (*unstructured.Unstructured, error) {
	var objMap map[string]interface{}
	err := json.Unmarshal(raw.Raw, &objMap)
	if err != nil {
		return nil, err
	}
	return &unstructured.Unstructured{
		Object: objMap,
	}, nil
}

// RawExtension2Application converts runtime.RawExtension to Application
func RawExtension2Application(raw runtime.RawExtension) (*v1beta1.Application, error) {
	a := &v1beta1.Application{}
	b, err := raw.MarshalJSON()
	if err != nil {
		return nil, err
	}
	if err := json.Unmarshal(b, a); err != nil {
		return nil, err
	}
	if len(a.GetNamespace()) == 0 {
		a.SetNamespace("default")
	}
	return a, nil
}

// Object2Map turn the Object to a map
func Object2Map(obj interface{}) (map[string]interface{}, error) {
	var res map[string]interface{}
	bts, err := json.Marshal(obj)
	if err != nil {
		return nil, err
	}
	err = json.Unmarshal(bts, &res)
	return res, err
}

// Object2RawExtension converts an object to a rawExtension
func Object2RawExtension(obj interface{}) *runtime.RawExtension {
	bts := MustJSONMarshal(obj)
	return &runtime.RawExtension{
		Raw: bts,
	}
}

// MustJSONMarshal json-marshals an object into bytes. It panics on err.
func MustJSONMarshal(obj interface{}) []byte {
	b, err := json.Marshal(obj)
	if err != nil {
		panic(err)
	}
	return b
}

// RawExtension2Map will convert rawExtension to map
func RawExtension2Map(raw *runtime.RawExtension) (map[string]interface{}, error) {
	if raw == nil {
		return nil, nil
	}
	data, err := raw.MarshalJSON()
	if err != nil {
		return nil, err
	}
	var ret map[string]interface{}
	err = json.Unmarshal(data, &ret)
	if err != nil {
		return nil, err
	}
	return ret, err
}

// GenTraitName generate trait name
func GenTraitName(componentName string, ct *unstructured.Unstructured, traitType string) string {
	var traitMiddleName = TraitPrefixKey
	if traitType != "" && traitType != Dummy {
		traitMiddleName = strings.ToLower(traitType)
	}
	return fmt.Sprintf("%s-%s-%s", componentName, traitMiddleName, ComputeHash(ct))
}

// ComputeHash returns a hash value calculated from pod template and
// a collisionCount to avoid hash collision. The hash will be safe encoded to
// avoid bad words.
func ComputeHash(trait *unstructured.Unstructured) string {
	componentTraitHasher := fnv.New32a()
	DeepHashObject(componentTraitHasher, *trait)

	return rand.SafeEncodeString(fmt.Sprint(componentTraitHasher.Sum32()))
}

// DeepHashObject writes specified object to hash using the spew library
// which follows pointers and prints actual values of the nested objects
// ensuring the hash does not change when a pointer changes.
func DeepHashObject(hasher hash.Hash, objectToWrite interface{}) {
	hasher.Reset()
	printer := spew.ConfigState{
		Indent:         " ",
		SortKeys:       true,
		DisableMethods: true,
		SpewKeys:       true,
	}
	_, _ = printer.Fprintf(hasher, "%#v", objectToWrite)
}

// AddLabels will merge labels with existing labels. If any conflict keys, use new value to override existing value.
func AddLabels(o labelAnnotationObject, labels map[string]string) {
	o.SetLabels(MergeMapOverrideWithDst(o.GetLabels(), labels))
}

// AddAnnotations will merge annotations with existing ones. If any conflict keys, use new value to override existing value.
func AddAnnotations(o labelAnnotationObject, annos map[string]string) {
	o.SetAnnotations(MergeMapOverrideWithDst(o.GetAnnotations(), annos))
}

// MergeMapOverrideWithDst merges two could be nil maps. Keep the dst for any conflicts,
func MergeMapOverrideWithDst(src, dst map[string]string) map[string]string {
	if src == nil && dst == nil {
		return nil
	}
	r := make(map[string]string)
	for k, v := range src {
		r[k] = v
	}
	// override the src for the same key
	for k, v := range dst {
		r[k] = v
	}
	return r
}

// ExtractComponentName will extract the componentName from a revisionName
func ExtractComponentName(revisionName string) string {
	splits := strings.Split(revisionName, "-")
	return strings.Join(splits[0:len(splits)-1], "-")
}

// ExtractRevisionNum  extract revision number
func ExtractRevisionNum(appRevision string, delimiter string) (int, error) {
	splits := strings.Split(appRevision, delimiter)
	// check some bad appRevision name, eg:v1, appv2
	if len(splits) == 1 {
		return 0, errors.New(ErrBadRevision)
	}
	// check some bad appRevision name, eg:myapp-a1
	if !strings.HasPrefix(splits[len(splits)-1], "v") {
		return 0, errors.New(ErrBadRevision)
	}
	return strconv.Atoi(strings.TrimPrefix(splits[len(splits)-1], "v"))
}

// Min for int
func Min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// Max for int
func Max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

// Abs for int
func Abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}

// AsOwner converts the supplied object reference to an owner reference.
func AsOwner(r *corev1.ObjectReference) metav1.OwnerReference {
	return metav1.OwnerReference{
		APIVersion: r.APIVersion,
		Kind:       r.Kind,
		Name:       r.Name,
		UID:        r.UID,
	}
}

// AsController converts the supplied object reference to a controller
// reference. You may also consider using metav1.NewControllerRef.
func AsController(r *corev1.ObjectReference) metav1.OwnerReference {
	c := true
	ref := AsOwner(r)
	ref.Controller = &c
	return ref
}

// NamespaceAccessor namespace accessor for resource
type NamespaceAccessor interface {
	For(obj client.Object) string
	Namespace() string
}

type applicationResourceNamespaceAccessor struct {
	applicationNamespace string
	overrideNamespace    string
}

// For access namespace for resource
func (accessor *applicationResourceNamespaceAccessor) For(obj client.Object) string {
	if accessor.overrideNamespace != "" {
		return accessor.overrideNamespace
	}
	if originalNamespace := obj.GetNamespace(); originalNamespace != "" {
		return originalNamespace
	}
	return accessor.applicationNamespace
}

// Namespace the namespace by default
func (accessor *applicationResourceNamespaceAccessor) Namespace() string {
	if accessor.overrideNamespace != "" {
		return accessor.overrideNamespace
	}
	return accessor.applicationNamespace
}

// NewApplicationResourceNamespaceAccessor create namespace accessor for resource in application
func NewApplicationResourceNamespaceAccessor(appNs, overrideNs string) NamespaceAccessor {
	return &applicationResourceNamespaceAccessor{applicationNamespace: appNs, overrideNamespace: overrideNs}
}