/
mutate_awscluster.go
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/
mutate_awscluster.go
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package awscluster
import (
"context"
"fmt"
"strings"
"github.com/blang/semver/v4"
infrastructurev1alpha3 "github.com/giantswarm/apiextensions/v3/pkg/apis/infrastructure/v1alpha3"
"github.com/giantswarm/k8sclient/v5/pkg/k8sclient"
"github.com/giantswarm/k8smetadata/pkg/annotation"
"github.com/giantswarm/microerror"
"github.com/giantswarm/micrologger"
admissionv1 "k8s.io/api/admission/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/giantswarm/aws-admission-controller/v3/config"
aws "github.com/giantswarm/aws-admission-controller/v3/pkg/aws/v1alpha3"
"github.com/giantswarm/aws-admission-controller/v3/pkg/key"
"github.com/giantswarm/aws-admission-controller/v3/pkg/label"
"github.com/giantswarm/aws-admission-controller/v3/pkg/mutator"
)
const (
stringTrue = "true"
stringFalse = "false"
)
type Config struct {
K8sClient k8sclient.Interface
Logger micrologger.Logger
}
// Mutator for AWSMachineDeployment object.
type Mutator struct {
k8sClient k8sclient.Interface
logger micrologger.Logger
podCIDRBlock string
dnsDomain string
region string
validAvailabilityZones []string
}
func NewMutator(config config.Config) (*Mutator, error) {
if config.K8sClient == nil {
return nil, microerror.Maskf(invalidConfigError, "%T.K8sClient must not be empty", config)
}
if config.Logger == nil {
return nil, microerror.Maskf(invalidConfigError, "%T.Logger must not be empty", config)
}
var availabilityZones []string = strings.Split(config.AvailabilityZones, ",")
mutator := &Mutator{
k8sClient: config.K8sClient,
logger: config.Logger,
podCIDRBlock: fmt.Sprintf("%s/%s", config.PodSubnet, config.PodCIDR),
dnsDomain: strings.TrimPrefix(config.Endpoint, "k8s."),
region: config.Region,
validAvailabilityZones: availabilityZones,
}
return mutator, nil
}
// Mutate is the function executed for every matching webhook request.
func (m *Mutator) Mutate(request *admissionv1.AdmissionRequest) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
if request.DryRun != nil && *request.DryRun {
return result, nil
}
if request.Operation == admissionv1.Create {
return m.MutateCreate(request)
}
if request.Operation == admissionv1.Update {
return m.MutateUpdate(request)
}
return result, nil
}
// MutateCreate is the function executed for every create webhook request.
func (m *Mutator) MutateCreate(request *admissionv1.AdmissionRequest) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
var patch []mutator.PatchOperation
var err error
awsCluster := &infrastructurev1alpha3.AWSCluster{}
if _, _, err = mutator.Deserializer.Decode(request.Object.Raw, nil, awsCluster); err != nil {
return nil, microerror.Maskf(parsingFailedError, "unable to parse AWSCluster: %v", err)
}
patch, err = m.MutatePodCIDR(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch = aws.MutateCAPILabel(&aws.Handler{K8sClient: m.k8sClient, Logger: m.logger}, awsCluster)
result = append(result, patch...)
patch, err = m.MutateCredential(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateDescription(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateDomain(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateRegion(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateReleaseVersion(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
releaseVersion, err := aws.ReleaseVersion(awsCluster, patch)
if err != nil {
return nil, microerror.Maskf(parsingFailedError, "unable to parse release version from AWSCluster")
}
result = append(result, patch...)
patch, err = m.MutateOperatorVersion(*awsCluster, releaseVersion)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
if !aws.IsHAVersion(releaseVersion) {
patch, err = m.MutateMasterPreHA(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
}
return result, nil
}
// MutateUpdate is the function executed for every update webhook request.
func (m *Mutator) MutateUpdate(request *admissionv1.AdmissionRequest) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
var patch []mutator.PatchOperation
var err error
awsCluster := &infrastructurev1alpha3.AWSCluster{}
if _, _, err = mutator.Deserializer.Decode(request.Object.Raw, nil, awsCluster); err != nil {
return nil, microerror.Maskf(parsingFailedError, "unable to parse AWSCluster: %v", err)
}
awsClusterOld := &infrastructurev1alpha3.AWSCluster{}
if _, _, err = mutator.Deserializer.Decode(request.OldObject.Raw, nil, awsClusterOld); err != nil {
return nil, microerror.Maskf(parsingFailedError, "unable to parse old AWSCluster: %v", err)
}
releaseVersion, err := aws.ReleaseVersion(awsCluster, patch)
if err != nil {
return nil, microerror.Maskf(parsingFailedError, "unable to parse release version from AWSCluster")
}
patch, err = m.MutatePodCIDR(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch = aws.MutateCAPILabel(&aws.Handler{K8sClient: m.k8sClient, Logger: m.logger}, awsCluster)
result = append(result, patch...)
patch, err = m.MutateCredential(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateDescription(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateDomain(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateRegion(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
patch, err = m.MutateAnnotationNodeTerminateUnhealthy(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
if !aws.IsHAVersion(releaseVersion) {
patch, err = m.MutateMasterPreHA(*awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
}
return result, nil
}
// MutatePodCIDR defaults the Pod CIDR if it is not set.
func (m *Mutator) MutatePodCIDR(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
//nolint:staticcheck // SA4022 the address of a variable cannot be nil
if &awsCluster.Spec.Provider.Pods != nil {
if awsCluster.Spec.Provider.Pods.CIDRBlock != "" {
return result, nil
}
if awsCluster.Spec.Provider.Pods.ExternalSNAT != nil {
// If the Pod CIDR is not set but the pods attribute exists, we default here
m.Log("level", "debug", "message", fmt.Sprintf("AWSCluster %s Pod CIDR Block is not set and will be defaulted to %s",
awsCluster.ObjectMeta.Name,
m.podCIDRBlock),
)
patch := mutator.PatchAdd("/spec/provider/pods/", "cidrBlock")
result = append(result, patch)
patch = mutator.PatchAdd("/spec/provider/pods/cidrBlock", m.podCIDRBlock)
result = append(result, patch)
return result, nil
}
}
// If the Pod CIDR is not set we default it here
m.Log("level", "debug", "message", fmt.Sprintf("AWSCluster %s Pod CIDR Block is not set and will be defaulted to %s",
awsCluster.ObjectMeta.Name,
m.podCIDRBlock),
)
patch := mutator.PatchAdd("/spec/provider/", "pods")
result = append(result, patch)
patch = mutator.PatchAdd("/spec/provider/pods", map[string]string{"cidrBlock": m.podCIDRBlock})
result = append(result, patch)
return result, nil
}
// MutateMasterPreHA is there to mutate the master instance attributes of the AWSCluster CR in legacy versions.
// This can be deprecated once no versions < 11.4.0 are in use anymore
func (m *Mutator) MutateMasterPreHA(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
var availabilityZone string
var instanceType string
{
//nolint:staticcheck // SA4022 the address of a variable cannot be nil
if &awsCluster.Spec.Provider.Master != nil {
if awsCluster.Spec.Provider.Master.AvailabilityZone != "" && awsCluster.Spec.Provider.Master.InstanceType != "" {
return result, nil
}
availabilityZone = awsCluster.Spec.Provider.Master.AvailabilityZone
instanceType = awsCluster.Spec.Provider.Master.InstanceType
} else {
patch := mutator.PatchAdd("/spec/provider/", "master")
result = append(result, patch)
}
}
if instanceType == "" {
instanceType = aws.DefaultMasterInstanceType
}
if availabilityZone == "" {
defaultedAZs := aws.GetNavailabilityZones(&aws.Handler{K8sClient: m.k8sClient, Logger: m.logger}, 1, m.validAvailabilityZones)
availabilityZone = defaultedAZs[0]
}
// If the Master attributes are not set, we default them here
m.Log("level", "debug", "message", fmt.Sprintf("Pre-HA AWSCluster %s Master attributes will be defaulted to availabilityZone %s and instanceType %s",
awsCluster.ObjectMeta.Name,
availabilityZone,
instanceType),
)
patch := mutator.PatchAdd("/spec/provider/master", map[string]string{"availabilityZone": availabilityZone, "instanceType": instanceType})
result = append(result, patch)
return result, nil
}
// MutateCredential defaults the cluster credential if it is not set.
func (m *Mutator) MutateCredential(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
if awsCluster.Spec.Provider.CredentialSecret.Name != "" && awsCluster.Spec.Provider.CredentialSecret.Namespace != "" {
return result, nil
}
// If the cluster credential secret attribute is not set or incomplete, we default here
var secretName types.NamespacedName
{
secret, err := m.fetchCredentialSecret(key.Organization(&awsCluster))
if IsNotFound(err) {
// if the credential secret can not be found we do no fail but use the default one
m.Log("level", "debug", "message", fmt.Sprintf("Could not fetch credential-secret. Using default secret instead: %v", err))
secretName = aws.DefaultCredentialSecret()
} else if err != nil {
return nil, microerror.Mask(err)
} else {
secretName = types.NamespacedName{
Name: secret.GetName(),
Namespace: secret.GetNamespace(),
}
}
}
m.Log("level", "debug", "message", fmt.Sprintf("AWSCluster %s credential secret is not set and will be defaulted to %s/%s",
awsCluster.ObjectMeta.Name,
secretName.Namespace,
secretName.Name),
)
patch := mutator.PatchAdd("/spec/provider/credentialSecret", map[string]string{"name": secretName.Name, "namespace": secretName.Namespace})
result = append(result, patch)
return result, nil
}
func (m *Mutator) fetchCredentialSecret(organization string) (corev1.Secret, error) {
var err error
secrets := corev1.SecretList{}
// return early if no org is given
if organization == "" {
return corev1.Secret{}, microerror.Maskf(notFoundError, "Could not find secret because organization is unknown.")
}
// Fetch the credential secret
m.Log("level", "debug", "message", fmt.Sprintf("Fetching credential secret for organization %s", organization))
err = m.k8sClient.CtrlClient().List(
context.Background(),
&secrets,
client.MatchingLabels{label.Organization: organization, label.ManagedBy: "credentiald"},
)
if err != nil {
return corev1.Secret{}, microerror.Maskf(notFoundError, "Failed to fetch credential-secret: %v", err)
}
if len(secrets.Items) == 0 {
return corev1.Secret{}, microerror.Maskf(notFoundError, "Could not find credential-secret for organization %s", organization)
}
if len(secrets.Items) > 1 {
return corev1.Secret{}, microerror.Maskf(notFoundError, "Found %v credential secrets instead of one for organization %s", len(secrets.Items), organization)
}
return secrets.Items[0], nil
}
// MutateDescription defaults the cluster description if it is not set.
func (m *Mutator) MutateDescription(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
if awsCluster.Spec.Cluster.Description == "" {
// If the cluster description is not set, we default here
m.Log("level", "debug", "message", fmt.Sprintf("AWSCluster %s Description is not set and will be defaulted to %s",
awsCluster.ObjectMeta.Name,
aws.DefaultClusterDescription),
)
patch := mutator.PatchAdd("/spec/cluster/description", aws.DefaultClusterDescription)
result = append(result, patch)
}
return result, nil
}
// MutateDomain defaults the cluster dns domain if it is not set.
func (m *Mutator) MutateDomain(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
if awsCluster.Spec.Cluster.DNS.Domain == "" {
// If the dns domain is not set, we default here
m.Log("level", "debug", "message", fmt.Sprintf("AWSCluster %s DNS domain is not set and will be defaulted to %s",
awsCluster.ObjectMeta.Name,
m.dnsDomain),
)
patch := mutator.PatchAdd("/spec/cluster/dns/domain", m.dnsDomain)
result = append(result, patch)
}
return result, nil
}
func (m *Mutator) MutateOperatorVersion(awsCluster infrastructurev1alpha3.AWSCluster, releaseVersion *semver.Version) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
var patch []mutator.PatchOperation
var err error
if key.AWSOperator(&awsCluster) != "" {
return result, nil
}
// Retrieve the `Release` CR.
release, err := aws.FetchRelease(&aws.Handler{K8sClient: m.k8sClient, Logger: m.logger}, releaseVersion)
if err != nil {
return nil, microerror.Mask(err)
}
// mutate the operator label
patch, err = aws.MutateLabelFromRelease(&aws.Handler{K8sClient: m.k8sClient, Logger: m.logger}, &awsCluster, *release, label.AWSOperatorVersion, "aws-operator")
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
return result, nil
}
func (m *Mutator) MutateReleaseVersion(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
var patch []mutator.PatchOperation
var err error
if key.Release(&awsCluster) != "" {
return result, nil
}
// Retrieve the `Cluster` CR related to this object.
cluster, err := aws.FetchCluster(&aws.Handler{K8sClient: m.k8sClient, Logger: m.logger}, &awsCluster)
if err != nil {
return nil, microerror.Mask(err)
}
// mutate the release label
patch, err = aws.MutateLabelFromCluster(&aws.Handler{K8sClient: m.k8sClient, Logger: m.logger}, &awsCluster, *cluster, label.Release)
if err != nil {
return nil, microerror.Mask(err)
}
result = append(result, patch...)
return result, nil
}
// MutateRegion defaults the cluster region if it is not set.
func (m *Mutator) MutateRegion(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
if awsCluster.Spec.Provider.Region == "" {
// If the region is not set, we default here
m.Log("level", "debug", "message", fmt.Sprintf("AWSCluster %s region is not set and will be defaulted to %s",
awsCluster.ObjectMeta.Name,
m.region),
)
patch := mutator.PatchAdd("/spec/provider/region", m.region)
result = append(result, patch)
}
return result, nil
}
//MutateAnnotationNodeTerminateUnhealthy migrate NodeTerminateUnhealthy annotations from alpha to stable in case it is configured.
// TODO https://github.com/giantswarm/giantswarm/issues/17395
// this migration code can be removed once all AWS clusters are on release 15.0.0 or newer
func (m *Mutator) MutateAnnotationNodeTerminateUnhealthy(awsCluster infrastructurev1alpha3.AWSCluster) ([]mutator.PatchOperation, error) {
var result []mutator.PatchOperation
release, err := semver.New(key.Release(&awsCluster))
if err != nil {
return nil, microerror.Maskf(notAllowedError, fmt.Sprintf("AWSCluster release has invalid value '%s'.", key.Release(&awsCluster)))
}
// new annotation is available from release >= 15.x.x
release15 := semver.MustParse("14.99.99")
if release.GE(release15) {
//load the old alpha annotation
if terminateUnhealthy, ok := awsCluster.GetAnnotations()[aws.AnnotationAlphaNodeTerminateUnhealthy]; ok {
// clean the old annotation
delete(awsCluster.Annotations, aws.AnnotationAlphaNodeTerminateUnhealthy)
// set new annotation, any value except 'false' is considered as true
if terminateUnhealthy == stringFalse {
awsCluster.Annotations[annotation.NodeTerminateUnhealthy] = stringFalse
} else {
awsCluster.Annotations[annotation.NodeTerminateUnhealthy] = stringTrue
}
m.Log("level", "debug", "message", fmt.Sprintf("AWSCluster annotation '%s' migrated to '%s'.",
aws.AnnotationAlphaNodeTerminateUnhealthy,
annotation.NodeTerminateUnhealthy),
)
patch := mutator.PatchAdd("/metadata/annotations", awsCluster.Annotations)
result = append(result, patch)
}
}
return result, nil
}
func (m *Mutator) Log(keyVals ...interface{}) {
m.logger.Log(keyVals...)
}
func (m *Mutator) Resource() string {
return "awscluster"
}