/
mesh_validator.go
90 lines (77 loc) · 2.81 KB
/
mesh_validator.go
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package appmesh
import (
"context"
appmesh "github.com/aws/aws-app-mesh-controller-for-k8s/apis/appmesh/v1beta2"
"github.com/aws/aws-app-mesh-controller-for-k8s/pkg/webhook"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/runtime"
"reflect"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
"strings"
)
const apiPathValidateAppMeshMesh = "/validate-appmesh-k8s-aws-v1beta2-mesh"
// NewMeshValidator returns a validator for Mesh.
func NewMeshValidator(ipFamily string) *meshValidator {
return &meshValidator{
ipFamily: ipFamily,
}
}
var _ webhook.Validator = &meshValidator{}
type meshValidator struct {
ipFamily string
}
func (v *meshValidator) Prototype(req admission.Request) (runtime.Object, error) {
return &appmesh.Mesh{}, nil
}
func (v *meshValidator) ValidateCreate(ctx context.Context, obj runtime.Object) error {
mesh := obj.(*appmesh.Mesh)
if err := v.checkIpPreference(mesh); err != nil {
return err
}
return nil
}
func (v *meshValidator) ValidateUpdate(ctx context.Context, obj runtime.Object, oldObj runtime.Object) error {
mesh := obj.(*appmesh.Mesh)
oldMesh := oldObj.(*appmesh.Mesh)
if err := v.enforceFieldsImmutability(mesh, oldMesh); err != nil {
return err
}
if err := v.checkIpPreference(mesh); err != nil {
return err
}
return nil
}
func (v *meshValidator) ValidateDelete(ctx context.Context, obj runtime.Object) error {
return nil
}
// enforceFieldsImmutability will enforce immutable fields are not changed.
func (v *meshValidator) enforceFieldsImmutability(mesh *appmesh.Mesh, oldMesh *appmesh.Mesh) error {
var changedImmutableFields []string
if !reflect.DeepEqual(mesh.Spec.AWSName, oldMesh.Spec.AWSName) {
changedImmutableFields = append(changedImmutableFields, "spec.awsName")
}
if len(changedImmutableFields) != 0 {
return errors.Errorf("%s update may not change these fields: %s", "Mesh", strings.Join(changedImmutableFields, ","))
}
return nil
}
func (v *meshValidator) checkIpPreference(mesh *appmesh.Mesh) error {
if mesh.Spec.ServiceDiscovery == nil {
if v.ipFamily == IPv4 {
return nil
}
} else {
ipPreference := mesh.Spec.ServiceDiscovery.IpPreference
if *ipPreference == appmesh.IpPreferenceIPv4 || *ipPreference == appmesh.IpPreferenceIPv6 {
return nil
} else {
return errors.Errorf("Only non-empty values allowed are %s or %s", appmesh.IpPreferenceIPv4, appmesh.IpPreferenceIPv6)
}
}
return nil
}
// +kubebuilder:webhook:path=/validate-appmesh-k8s-aws-v1beta2-mesh,mutating=false,failurePolicy=fail,groups=appmesh.k8s.aws,resources=meshes,verbs=create;update,versions=v1beta2,name=vmesh.appmesh.k8s.aws,sideEffects=None,webhookVersions=v1beta1
func (v *meshValidator) SetupWithManager(mgr ctrl.Manager) {
mgr.GetWebhookServer().Register(apiPathValidateAppMeshMesh, webhook.ValidatingWebhookForValidator(v))
}