/
applier.go
452 lines (377 loc) · 14.2 KB
/
applier.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package kubernetes
import (
"bytes"
"context"
"fmt"
"io"
"strings"
"github.com/hashicorp/go-multierror"
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/util/yaml"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/client"
errorsutils "github.com/gardener/gardener/pkg/utils/errors"
)
// defaultApplier applies objects by retrieving their current state and then either creating / updating them
// (update happens with a predefined merge logic).
type defaultApplier struct {
client client.Client
restMapper meta.RESTMapper
}
// NewApplier constructs a new Applier from the given client.
func NewApplier(c client.Client, restMapper meta.RESTMapper) Applier {
return &defaultApplier{client: c, restMapper: restMapper}
}
// NewApplierForConfig creates a new Applier for the given rest.Config.
// Use NewApplier if you already have a client and RESTMapper at hand, as this will create a new direct client.
func NewApplierForConfig(config *rest.Config) (Applier, error) {
opts := client.Options{}
if err := setClientOptionsDefaults(config, &opts); err != nil {
return nil, err
}
c, err := client.New(config, opts)
if err != nil {
return nil, err
}
return NewApplier(c, opts.Mapper), nil
}
func (a *defaultApplier) applyObject(ctx context.Context, desired *unstructured.Unstructured, options MergeFuncs) error {
// look up scope of objects' kind to check, if we should default the namespace field
mapping, err := a.restMapper.RESTMapping(desired.GroupVersionKind().GroupKind(), desired.GroupVersionKind().Version)
if err != nil || mapping == nil {
// Don't reset RESTMapper in case of cache misses. Most probably indicates, that the corresponding CRD is not yet applied.
// CRD might be applied later as part of the same chart
// default namespace on a best effort basis
if desired.GetKind() != "Namespace" && desired.GetNamespace() == "" {
desired.SetNamespace(metav1.NamespaceDefault)
}
} else {
if mapping.Scope.Name() == meta.RESTScopeNameNamespace {
// default namespace field to `default` in case of namespaced kinds
if desired.GetNamespace() == "" {
desired.SetNamespace(metav1.NamespaceDefault)
}
} else {
// unset namespace field in case of non-namespaced kinds
desired.SetNamespace("")
}
}
key := client.ObjectKeyFromObject(desired)
if len(key.Name) == 0 {
return fmt.Errorf("missing 'metadata.name' in: %+v", desired)
}
current := &unstructured.Unstructured{}
current.SetGroupVersionKind(desired.GroupVersionKind())
if err = a.client.Get(ctx, key, current); err != nil {
if apierrors.IsNotFound(err) {
return a.client.Create(ctx, desired)
}
return err
}
if err := a.mergeObjects(desired, current, options); err != nil {
return err
}
return a.client.Update(ctx, desired)
}
func (a *defaultApplier) deleteObject(ctx context.Context, desired *unstructured.Unstructured, opts *DeleteManifestOptions) error {
if desired.GetNamespace() == "" {
desired.SetNamespace(metav1.NamespaceDefault)
}
if len(desired.GetName()) == 0 {
return fmt.Errorf("missing 'metadata.name' in: %+v", desired)
}
err := a.client.Delete(ctx, desired)
if err != nil {
// this is kept for backwards compatibility.
if apierrors.IsNotFound(err) {
return nil
}
for _, tf := range opts.TolerateErrorFuncs {
if tf != nil && tf(err) {
return nil
}
}
}
return err
}
// DefaultMergeFuncs contains options for common k8s objects, e.g. Service, ServiceAccount.
var (
DefaultMergeFuncs = MergeFuncs{
corev1.SchemeGroupVersion.WithKind("Service").GroupKind(): func(newObj, oldObj *unstructured.Unstructured) {
newSvcType, found, _ := unstructured.NestedString(newObj.Object, "spec", "type")
if !found {
newSvcType = string(corev1.ServiceTypeClusterIP)
_ = unstructured.SetNestedField(newObj.Object, newSvcType, "spec", "type")
}
oldSvcType, found, _ := unstructured.NestedString(oldObj.Object, "spec", "type")
if !found {
oldSvcType = string(corev1.ServiceTypeClusterIP)
}
annotations, found, _ := unstructured.NestedMap(oldObj.Object, "metadata", "annotations")
if found {
mergedAnnotations := make(map[string]interface{})
for key, value := range annotations {
annotation := key
annotationValue := value.(string)
for _, keepAnnotation := range keepServiceAnnotations() {
if strings.HasPrefix(annotation, keepAnnotation) {
mergedAnnotations[annotation] = annotationValue
}
}
}
newAnnotations, found, _ := unstructured.NestedMap(newObj.Object, "metadata", "annotations")
if found {
for key, value := range newAnnotations {
mergedAnnotations[key] = value.(string)
}
}
_ = unstructured.SetNestedMap(newObj.Object, mergedAnnotations, "metadata", "annotations")
}
switch newSvcType {
case string(corev1.ServiceTypeLoadBalancer), string(corev1.ServiceTypeNodePort):
oldPorts, found, _ := unstructured.NestedSlice(oldObj.Object, "spec", "ports")
if !found {
// no old ports probably means that the service was of type External name before.
break
}
newPorts, found, _ := unstructured.NestedSlice(newObj.Object, "spec", "ports")
if !found {
// no new ports is safe to ignore
break
}
ports := make([]interface{}, 0, len(newPorts))
for _, newPort := range newPorts {
np := newPort.(map[string]interface{})
npName, _, _ := unstructured.NestedString(np, "name")
npPort, _ := nestedFloat64OrInt64(np, "port")
nodePort, ok := nestedFloat64OrInt64(np, "nodePort")
for _, oldPortObj := range oldPorts {
op := oldPortObj.(map[string]interface{})
opName, _, _ := unstructured.NestedString(op, "name")
opPort, _ := nestedFloat64OrInt64(op, "port")
if (opName == npName || opPort == npPort) && (!ok || nodePort == 0) {
np["nodePort"] = op["nodePort"]
}
}
ports = append(ports, np)
}
_ = unstructured.SetNestedSlice(newObj.Object, ports, "spec", "ports")
case string(corev1.ServiceTypeExternalName):
// there is no ClusterIP in this case
return
}
// ClusterIP is immutable unless that old service is of type ExternalName
if oldSvcType != string(corev1.ServiceTypeExternalName) {
newClusterIP, _, _ := unstructured.NestedString(newObj.Object, "spec", "clusterIP")
if newClusterIP != corev1.ClusterIPNone || newSvcType != string(corev1.ServiceTypeClusterIP) {
oldClusterIP, _, _ := unstructured.NestedString(oldObj.Object, "spec", "clusterIP")
_ = unstructured.SetNestedField(newObj.Object, oldClusterIP, "spec", "clusterIP")
}
}
newETP, _, _ := unstructured.NestedString(newObj.Object, "spec", "externalTrafficPolicy")
oldETP, _, _ := unstructured.NestedString(oldObj.Object, "spec", "externalTrafficPolicy")
if oldSvcType == string(corev1.ServiceTypeLoadBalancer) &&
newSvcType == string(corev1.ServiceTypeLoadBalancer) &&
newETP == string(corev1.ServiceExternalTrafficPolicyTypeLocal) &&
oldETP == string(corev1.ServiceExternalTrafficPolicyTypeLocal) {
newHealthCheckPort, _ := nestedFloat64OrInt64(newObj.Object, "spec", "healthCheckNodePort")
if newHealthCheckPort == 0 {
oldHealthCheckPort, _ := nestedFloat64OrInt64(oldObj.Object, "spec", "healthCheckNodePort")
_ = unstructured.SetNestedField(newObj.Object, oldHealthCheckPort, "spec", "healthCheckNodePort")
}
}
},
corev1.SchemeGroupVersion.WithKind("ServiceAccount").GroupKind(): func(newObj, oldObj *unstructured.Unstructured) {
// We do not want to overwrite a ServiceAccount's `.secrets[]` list or `.imagePullSecrets[]`.
newObj.Object["secrets"] = oldObj.Object["secrets"]
newObj.Object["imagePullSecrets"] = oldObj.Object["imagePullSecrets"]
},
{Group: "autoscaling.k8s.io", Kind: "VerticalPodAutoscaler"}: func(newObj, oldObj *unstructured.Unstructured) {
// Never override the status of VPA resources
if oldStatus := oldObj.Object["status"]; oldStatus != nil {
newObj.Object["status"] = oldStatus
}
},
}
DeploymentKeepReplicasMergeFunc = MergeFunc(func(newObj, oldObj *unstructured.Unstructured) {
oldReplicas, ok := nestedFloat64OrInt64(oldObj.Object, "spec", "replicas")
if !ok {
return
}
_ = unstructured.SetNestedField(newObj.Object, oldReplicas, "spec", "replicas")
})
)
func nestedFloat64OrInt64(obj map[string]interface{}, fields ...string) (int64, bool) {
val, found, err := unstructured.NestedFieldNoCopy(obj, fields...)
if !found || err != nil {
return 0, found
}
f, ok := val.(float64)
if ok {
return int64(f), true
}
i, ok := val.(int64)
if ok {
return i, true
}
return 0, false
}
// CopyApplierOptions returns a copies of the provided applier options.
func CopyApplierOptions(in MergeFuncs) MergeFuncs {
out := make(MergeFuncs, len(in))
for k, v := range in {
out[k] = v
}
return out
}
func keepServiceAnnotations() []string {
return []string{"loadbalancer.openstack.org"}
}
func (a *defaultApplier) mergeObjects(newObj, oldObj *unstructured.Unstructured, mergeFuncs MergeFuncs) error {
newObj.SetResourceVersion(oldObj.GetResourceVersion())
// We do not want to overwrite the Finalizers.
newObj.Object["metadata"].(map[string]interface{})["finalizers"] = oldObj.Object["metadata"].(map[string]interface{})["finalizers"]
if merge, ok := mergeFuncs[newObj.GroupVersionKind().GroupKind()]; ok {
merge(newObj, oldObj)
}
return nil
}
// ApplyManifest is a function which does the same like `kubectl apply -f <file>`. It takes a bunch of manifests <m>,
// all concatenated in a byte slice, and sends them one after the other to the API server. If a resource
// already exists at the API server, it will update it. It returns an error as soon as the first error occurs.
func (a *defaultApplier) ApplyManifest(ctx context.Context, r UnstructuredReader, options MergeFuncs) error {
allErrs := &multierror.Error{
ErrorFormat: errorsutils.NewErrorFormatFuncWithPrefix("failed to apply manifests"),
}
for {
obj, err := r.Read()
if err == io.EOF {
break
}
if err != nil {
allErrs = multierror.Append(allErrs, fmt.Errorf("could not read object: %+v", err))
continue
}
if obj == nil {
continue
}
if err := a.applyObject(ctx, obj, options); err != nil {
allErrs = multierror.Append(allErrs, fmt.Errorf("could not apply object of kind %q \"%s/%s\": %+v", obj.GetKind(), obj.GetNamespace(), obj.GetName(), err))
continue
}
}
return allErrs.ErrorOrNil()
}
// DeleteManifest is a function which does the same like `kubectl delete -f <file>`. It takes a bunch of manifests <m>,
// all concatenated in a byte slice, and sends them one after the other to the API server for deletion.
// It returns an error as soon as the first error occurs.
func (a *defaultApplier) DeleteManifest(ctx context.Context, r UnstructuredReader, opts ...DeleteManifestOption) error {
allErrs := &multierror.Error{
ErrorFormat: errorsutils.NewErrorFormatFuncWithPrefix("failed to delete manifests"),
}
deleteOps := &DeleteManifestOptions{}
for _, o := range opts {
if o != nil {
o.MutateDeleteManifestOptions(deleteOps)
}
}
for {
obj, err := r.Read()
if err == io.EOF {
break
}
if err != nil {
allErrs = multierror.Append(allErrs, fmt.Errorf("could not read object: %+v", err))
continue
}
if obj == nil {
continue
}
if err := a.deleteObject(ctx, obj, deleteOps); err != nil {
allErrs = multierror.Append(allErrs, fmt.Errorf("could not delete object of kind %q \"%s/%s\": %+v", obj.GetKind(), obj.GetNamespace(), obj.GetName(), err))
continue
}
}
return allErrs.ErrorOrNil()
}
// UnstructuredReader an interface that all manifest readers should implement
type UnstructuredReader interface {
Read() (*unstructured.Unstructured, error)
}
// NewManifestReader initializes a reader for yaml manifests
func NewManifestReader(manifest []byte) UnstructuredReader {
return &manifestReader{
decoder: yaml.NewYAMLOrJSONDecoder(bytes.NewReader(manifest), 1024),
manifest: manifest,
}
}
// manifestReader is an unstructured reader that contains a JSONDecoder
type manifestReader struct {
decoder *yaml.YAMLOrJSONDecoder
manifest []byte
}
// Read decodes yaml data into an unstructured object
func (m *manifestReader) Read() (*unstructured.Unstructured, error) {
// loop for skipping empty yaml objects
for {
var data map[string]interface{}
err := m.decoder.Decode(&data)
if err == io.EOF {
return nil, err
}
if err != nil {
return nil, fmt.Errorf("error '%+v' decoding manifest: %s", err, string(m.manifest))
}
if data == nil {
continue
}
return &unstructured.Unstructured{Object: data}, nil
}
}
// NewNamespaceSettingReader initializes a reader for yaml manifests with support for setting the namespace
func NewNamespaceSettingReader(mReader UnstructuredReader, namespace string) UnstructuredReader {
return &namespaceSettingReader{
reader: mReader,
namespace: namespace,
}
}
// namespaceSettingReader is an unstructured reader that contains a JSONDecoder and a manifest reader (or other reader types)
type namespaceSettingReader struct {
reader UnstructuredReader
namespace string
}
// Read decodes yaml data into an unstructured object
func (n *namespaceSettingReader) Read() (*unstructured.Unstructured, error) {
readObj, err := n.reader.Read()
if err != nil {
return nil, err
}
readObj.SetNamespace(n.namespace)
return readObj, nil
}
// NewObjectReferenceReader initializes a reader from ObjectReference
func NewObjectReferenceReader(objectReference *corev1.ObjectReference) UnstructuredReader {
return &objectReferenceReader{
objectReference: objectReference,
}
}
// objectReferenceReader is an unstructured reader that contains a ObjectReference
type objectReferenceReader struct {
objectReference *corev1.ObjectReference
}
// Read translates ObjectReference into Unstructured object
func (r *objectReferenceReader) Read() (*unstructured.Unstructured, error) {
obj := &unstructured.Unstructured{}
obj.SetAPIVersion(r.objectReference.APIVersion)
obj.SetKind(r.objectReference.Kind)
obj.SetNamespace(r.objectReference.Namespace)
obj.SetName(r.objectReference.Name)
return obj, nil
}