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core.go
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core.go
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package resourceapply
import (
"bytes"
"fmt"
"sort"
"strings"
"k8s.io/klog"
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"
"github.com/openshift/library-go/pkg/operator/events"
"github.com/openshift/library-go/pkg/operator/resource/resourcemerge"
)
// ApplyNamespace merges objectmeta, does not worry about anything else
func ApplyNamespace(client coreclientv1.NamespacesGetter, recorder events.Recorder, 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)
reportCreateEvent(recorder, required, err)
return actual, true, err
}
if err != nil {
return nil, false, err
}
modified := resourcemerge.BoolPtr(false)
existingCopy := existing.DeepCopy()
resourcemerge.EnsureObjectMeta(modified, &existingCopy.ObjectMeta, required.ObjectMeta)
if !*modified {
return existingCopy, false, nil
}
if klog.V(4) {
klog.Infof("Namespace %q changes: %v", required.Name, JSONPatchNoError(existing, existingCopy))
}
actual, err := client.Namespaces().Update(existingCopy)
reportUpdateEvent(recorder, required, err)
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, recorder events.Recorder, 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)
reportCreateEvent(recorder, required, err)
return actual, true, err
}
if err != nil {
return nil, false, err
}
modified := resourcemerge.BoolPtr(false)
existingCopy := existing.DeepCopy()
resourcemerge.EnsureObjectMeta(modified, &existingCopy.ObjectMeta, required.ObjectMeta)
selectorSame := equality.Semantic.DeepEqual(existingCopy.Spec.Selector, required.Spec.Selector)
typeSame := false
requiredIsEmpty := len(required.Spec.Type) == 0
existingCopyIsCluster := existingCopy.Spec.Type == corev1.ServiceTypeClusterIP
if (requiredIsEmpty && existingCopyIsCluster) || equality.Semantic.DeepEqual(existingCopy.Spec.Type, required.Spec.Type) {
typeSame = true
}
if selectorSame && typeSame && !*modified {
return existingCopy, false, nil
}
existingCopy.Spec.Selector = required.Spec.Selector
existingCopy.Spec.Type = required.Spec.Type // if this is different, the update will fail. Status will indicate it.
if klog.V(4) {
klog.Infof("Service %q changes: %v", required.Namespace+"/"+required.Name, JSONPatchNoError(existing, required))
}
actual, err := client.Services(required.Namespace).Update(existingCopy)
reportUpdateEvent(recorder, required, err)
return actual, true, err
}
// ApplyPod merges objectmeta, does not worry about anything else
func ApplyPod(client coreclientv1.PodsGetter, recorder events.Recorder, required *corev1.Pod) (*corev1.Pod, bool, error) {
existing, err := client.Pods(required.Namespace).Get(required.Name, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
actual, err := client.Pods(required.Namespace).Create(required)
reportCreateEvent(recorder, required, err)
return actual, true, err
}
if err != nil {
return nil, false, err
}
modified := resourcemerge.BoolPtr(false)
existingCopy := existing.DeepCopy()
resourcemerge.EnsureObjectMeta(modified, &existingCopy.ObjectMeta, required.ObjectMeta)
if !*modified {
return existingCopy, false, nil
}
if klog.V(4) {
klog.Infof("Pod %q changes: %v", required.Namespace+"/"+required.Name, JSONPatchNoError(existing, required))
}
actual, err := client.Pods(required.Namespace).Update(existingCopy)
reportUpdateEvent(recorder, required, err)
return actual, true, err
}
// ApplyServiceAccount merges objectmeta, does not worry about anything else
func ApplyServiceAccount(client coreclientv1.ServiceAccountsGetter, recorder events.Recorder, 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)
reportCreateEvent(recorder, required, err)
return actual, true, err
}
if err != nil {
return nil, false, err
}
modified := resourcemerge.BoolPtr(false)
existingCopy := existing.DeepCopy()
resourcemerge.EnsureObjectMeta(modified, &existingCopy.ObjectMeta, required.ObjectMeta)
if !*modified {
return existingCopy, false, nil
}
if klog.V(4) {
klog.Infof("ServiceAccount %q changes: %v", required.Namespace+"/"+required.Name, JSONPatchNoError(existing, required))
}
actual, err := client.ServiceAccounts(required.Namespace).Update(existingCopy)
reportUpdateEvent(recorder, required, err)
return actual, true, err
}
// ApplyConfigMap merges objectmeta, requires data
func ApplyConfigMap(client coreclientv1.ConfigMapsGetter, recorder events.Recorder, 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)
reportCreateEvent(recorder, required, err)
return actual, true, err
}
if err != nil {
return nil, false, err
}
modified := resourcemerge.BoolPtr(false)
existingCopy := existing.DeepCopy()
resourcemerge.EnsureObjectMeta(modified, &existingCopy.ObjectMeta, required.ObjectMeta)
var modifiedKeys []string
for existingCopyKey, existingCopyValue := range existingCopy.Data {
if requiredValue, ok := required.Data[existingCopyKey]; !ok || (existingCopyValue != requiredValue) {
modifiedKeys = append(modifiedKeys, "data."+existingCopyKey)
}
}
for existingCopyKey, existingCopyBinValue := range existingCopy.BinaryData {
if requiredBinValue, ok := required.BinaryData[existingCopyKey]; !ok || !bytes.Equal(existingCopyBinValue, requiredBinValue) {
modifiedKeys = append(modifiedKeys, "binaryData."+existingCopyKey)
}
}
for requiredKey := range required.Data {
if _, ok := existingCopy.Data[requiredKey]; !ok {
modifiedKeys = append(modifiedKeys, "data."+requiredKey)
}
}
for requiredBinKey := range required.BinaryData {
if _, ok := existingCopy.BinaryData[requiredBinKey]; !ok {
modifiedKeys = append(modifiedKeys, "binaryData."+requiredBinKey)
}
}
dataSame := len(modifiedKeys) == 0
if dataSame && !*modified {
return existingCopy, false, nil
}
existingCopy.Data = required.Data
existingCopy.BinaryData = required.BinaryData
actual, err := client.ConfigMaps(required.Namespace).Update(existingCopy)
var details string
if !dataSame {
sort.Sort(sort.StringSlice(modifiedKeys))
details = fmt.Sprintf("cause by changes in %v", strings.Join(modifiedKeys, ","))
}
if klog.V(4) {
klog.Infof("ConfigMap %q changes: %v", required.Namespace+"/"+required.Name, JSONPatchNoError(existing, required))
}
reportUpdateEvent(recorder, required, err, details)
return actual, true, err
}
// ApplySecret merges objectmeta, requires data
func ApplySecret(client coreclientv1.SecretsGetter, recorder events.Recorder, required *corev1.Secret) (*corev1.Secret, bool, error) {
if len(required.StringData) > 0 {
return nil, false, fmt.Errorf("Secret.stringData is not supported")
}
existing, err := client.Secrets(required.Namespace).Get(required.Name, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
actual, err := client.Secrets(required.Namespace).Create(required)
reportCreateEvent(recorder, required, err)
return actual, true, err
}
if err != nil {
return nil, false, err
}
modified := resourcemerge.BoolPtr(false)
existingCopy := existing.DeepCopy()
resourcemerge.EnsureObjectMeta(modified, &existingCopy.ObjectMeta, required.ObjectMeta)
dataSame := equality.Semantic.DeepEqual(existingCopy.Data, required.Data)
if dataSame && !*modified {
return existingCopy, false, nil
}
existingCopy.Data = required.Data
if klog.V(4) {
klog.Infof("Secret %s/%s changes: %v", required.Namespace, required.Name, JSONPatchSecretNoError(existing, required))
}
actual, err := client.Secrets(required.Namespace).Update(existingCopy)
reportUpdateEvent(recorder, required, err)
return actual, true, err
}
func SyncConfigMap(client coreclientv1.ConfigMapsGetter, recorder events.Recorder, sourceNamespace, sourceName, targetNamespace, targetName string, ownerRefs []metav1.OwnerReference) (*corev1.ConfigMap, bool, error) {
source, err := client.ConfigMaps(sourceNamespace).Get(sourceName, metav1.GetOptions{})
switch {
case apierrors.IsNotFound(err):
deleteErr := client.ConfigMaps(targetNamespace).Delete(targetName, nil)
if _, getErr := client.ConfigMaps(targetNamespace).Get(targetName, metav1.GetOptions{}); getErr != nil && apierrors.IsNotFound(getErr) {
return nil, true, nil
}
if apierrors.IsNotFound(deleteErr) {
return nil, false, nil
}
if deleteErr == nil {
recorder.Eventf("TargetConfigDeleted", "Deleted target configmap %s/%s because source config does not exist", targetNamespace, targetName)
return nil, true, nil
}
return nil, false, deleteErr
case err != nil:
return nil, false, err
default:
source.Namespace = targetNamespace
source.Name = targetName
source.ResourceVersion = ""
source.OwnerReferences = ownerRefs
return ApplyConfigMap(client, recorder, source)
}
}
func SyncSecret(client coreclientv1.SecretsGetter, recorder events.Recorder, sourceNamespace, sourceName, targetNamespace, targetName string, ownerRefs []metav1.OwnerReference) (*corev1.Secret, bool, error) {
source, err := client.Secrets(sourceNamespace).Get(sourceName, metav1.GetOptions{})
switch {
case apierrors.IsNotFound(err):
if _, getErr := client.Secrets(targetNamespace).Get(targetName, metav1.GetOptions{}); getErr != nil && apierrors.IsNotFound(getErr) {
return nil, true, nil
}
deleteErr := client.Secrets(targetNamespace).Delete(targetName, nil)
if apierrors.IsNotFound(deleteErr) {
return nil, false, nil
}
if deleteErr == nil {
recorder.Eventf("TargetSecretDeleted", "Deleted target secret %s/%s because source config does not exist", targetNamespace, targetName)
return nil, true, nil
}
return nil, false, deleteErr
case err != nil:
return nil, false, err
default:
source.Namespace = targetNamespace
source.Name = targetName
source.ResourceVersion = ""
source.OwnerReferences = ownerRefs
return ApplySecret(client, recorder, source)
}
}