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core.go
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core.go
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package resourceapply
import (
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
coreclientv1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/utils/pointer"
"github.com/openshift/cluster-version-operator/lib/resourcemerge"
)
// ApplyNamespace merges objectmeta, does not worry about anything else
func ApplyNamespace(client coreclientv1.NamespacesGetter, required *corev1.Namespace) (*corev1.Namespace, bool, error) {
existing, err := client.Namespaces().Get(required.Name, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
actual, err := client.Namespaces().Create(required)
return actual, true, err
}
if err != nil {
return nil, false, err
}
// if we only create this resource, we have no need to continue further
if IsCreateOnly(required) {
return nil, false, nil
}
modified := pointer.BoolPtr(false)
resourcemerge.EnsureObjectMeta(modified, &existing.ObjectMeta, required.ObjectMeta)
if !*modified {
return existing, false, nil
}
actual, err := client.Namespaces().Update(existing)
return actual, true, err
}
// ApplyService merges objectmeta and requires
// TODO, since this cannot determine whether changes are due to legitimate actors (api server) or illegitimate ones (users), we cannot update
// TODO I've special cased the selector for now
func ApplyService(client coreclientv1.ServicesGetter, required *corev1.Service) (*corev1.Service, bool, error) {
existing, err := client.Services(required.Namespace).Get(required.Name, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
actual, err := client.Services(required.Namespace).Create(required)
return actual, true, err
}
if err != nil {
return nil, false, err
}
// if we only create this resource, we have no need to continue further
if IsCreateOnly(required) {
return nil, false, nil
}
modified := pointer.BoolPtr(false)
resourcemerge.EnsureObjectMeta(modified, &existing.ObjectMeta, required.ObjectMeta)
resourcemerge.EnsureServicePorts(modified, &existing.Spec.Ports, required.Spec.Ports)
selectorSame := equality.Semantic.DeepEqual(existing.Spec.Selector, required.Spec.Selector)
typeSame := equality.Semantic.DeepEqual(existing.Spec.Type, required.Spec.Type)
if selectorSame && typeSame && !*modified {
return nil, false, nil
}
existing.Spec.Selector = required.Spec.Selector
existing.Spec.Type = required.Spec.Type // if this is different, the update will fail. Status will indicate it.
actual, err := client.Services(required.Namespace).Update(existing)
return actual, true, err
}
// ApplyServiceAccount applies the required serviceaccount to the cluster.
func ApplyServiceAccount(client coreclientv1.ServiceAccountsGetter, required *corev1.ServiceAccount) (*corev1.ServiceAccount, bool, error) {
existing, err := client.ServiceAccounts(required.Namespace).Get(required.Name, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
actual, err := client.ServiceAccounts(required.Namespace).Create(required)
return actual, true, err
}
if err != nil {
return nil, false, err
}
// if we only create this resource, we have no need to continue further
if IsCreateOnly(required) {
return nil, false, nil
}
modified := pointer.BoolPtr(false)
resourcemerge.EnsureObjectMeta(modified, &existing.ObjectMeta, required.ObjectMeta)
if !*modified {
return existing, false, nil
}
actual, err := client.ServiceAccounts(required.Namespace).Update(existing)
return actual, true, err
}
// ApplyConfigMap applies the required serviceaccount to the cluster.
func ApplyConfigMap(client coreclientv1.ConfigMapsGetter, required *corev1.ConfigMap) (*corev1.ConfigMap, bool, error) {
existing, err := client.ConfigMaps(required.Namespace).Get(required.Name, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
actual, err := client.ConfigMaps(required.Namespace).Create(required)
return actual, true, err
}
if err != nil {
return nil, false, err
}
// if we only create this resource, we have no need to continue further
if IsCreateOnly(required) {
return nil, false, nil
}
modified := pointer.BoolPtr(false)
resourcemerge.EnsureConfigMap(modified, existing, *required)
if !*modified {
return existing, false, nil
}
actual, err := client.ConfigMaps(required.Namespace).Update(existing)
return actual, true, err
}