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store history revisions for sidecarset
Signed-off-by: veophi <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| /* | ||
| Copyright 2021 The Kruise Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package sidecarcontrol | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
|
|
||
| appsv1alpha1 "github.com/openkruise/kruise/apis/apps/v1alpha1" | ||
|
|
||
| apps "k8s.io/api/apps/v1" | ||
| "k8s.io/apimachinery/pkg/api/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| "k8s.io/client-go/kubernetes/scheme" | ||
| "k8s.io/kubernetes/pkg/controller/history" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| ) | ||
|
|
||
| var ( | ||
| patchCodec = scheme.Codecs.LegacyCodec(appsv1alpha1.SchemeGroupVersion) | ||
| ) | ||
|
|
||
| type HistoryControl interface { | ||
| CreateControllerRevision(parent metav1.Object, revision *apps.ControllerRevision, collisionCount *int32) (*apps.ControllerRevision, error) | ||
| NewRevision(s *appsv1alpha1.SidecarSet, namespace string, revision int64, collisionCount *int32) (*apps.ControllerRevision, error) | ||
| NextRevision(revisions []*apps.ControllerRevision) int64 | ||
| GetRevisionLabelSelector(s *appsv1alpha1.SidecarSet) *metav1.LabelSelector | ||
| } | ||
|
|
||
| type realControl struct { | ||
| Client client.Client | ||
| } | ||
|
|
||
| func NewHistoryControl(client client.Client) HistoryControl { | ||
| return &realControl{ | ||
| Client: client, | ||
| } | ||
| } | ||
|
|
||
| func (r *realControl) NewRevision(s *appsv1alpha1.SidecarSet, namespace string, revision int64, collisionCount *int32) ( | ||
| *apps.ControllerRevision, error, | ||
| ) { | ||
| patch, err := r.getPatch(s) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| cr, err := history.NewControllerRevision(s, | ||
| s.GetObjectKind().GroupVersionKind(), | ||
| s.Labels, | ||
| runtime.RawExtension{Raw: patch}, | ||
| revision, | ||
| collisionCount) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| cr.SetNamespace(namespace) | ||
| if cr.Labels == nil { | ||
| cr.Labels = make(map[string]string) | ||
| } | ||
| if cr.ObjectMeta.Annotations == nil { | ||
| cr.ObjectMeta.Annotations = make(map[string]string) | ||
| } | ||
| cr.Labels[SidecarSetKindName] = s.Name | ||
| for key, value := range s.Annotations { | ||
| cr.ObjectMeta.Annotations[key] = value | ||
| } | ||
| return cr, nil | ||
| } | ||
|
|
||
| // getPatch returns a strategic merge patch that can be applied to restore a SidecarSet to a | ||
| // previous version. If the returned error is nil the patch is valid. The current state that we save is just the | ||
| // PodSpecTemplate. We can modify this later to encompass more state (or less) and remain compatible with previously | ||
| // recorded patches. | ||
| func (r *realControl) getPatch(s *appsv1alpha1.SidecarSet) ([]byte, error) { | ||
| str, err := runtime.Encode(patchCodec, s) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var raw map[string]interface{} | ||
| _ = json.Unmarshal(str, &raw) | ||
|
|
||
| objCopy := make(map[string]interface{}) | ||
| specCopy := make(map[string]interface{}) | ||
| // only copy some specified fields of s.Spec to specCopy | ||
| spec := raw["spec"].(map[string]interface{}) | ||
| copySidecarSetSpecRevision(specCopy, spec) | ||
|
|
||
| objCopy["spec"] = specCopy | ||
| return json.Marshal(objCopy) | ||
| } | ||
|
|
||
| // NextRevision finds the next valid revision number based on revisions. If the length of revisions | ||
| // is 0 this is 1. Otherwise, it is 1 greater than the largest revision's Revision. This method | ||
| // assumes that revisions has been sorted by Revision. | ||
| func (r *realControl) NextRevision(revisions []*apps.ControllerRevision) int64 { | ||
| count := len(revisions) | ||
| if count <= 0 { | ||
| return 1 | ||
| } | ||
| return revisions[count-1].Revision + 1 | ||
| } | ||
|
|
||
| func (r *realControl) GetRevisionLabelSelector(s *appsv1alpha1.SidecarSet) *metav1.LabelSelector { | ||
| return &metav1.LabelSelector{ | ||
| MatchLabels: map[string]string{ | ||
| SidecarSetKindName: s.GetName(), | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func (r *realControl) CreateControllerRevision(parent metav1.Object, revision *apps.ControllerRevision, collisionCount *int32) (*apps.ControllerRevision, error) { | ||
| if collisionCount == nil { | ||
| return nil, fmt.Errorf("collisionCount should not be nil") | ||
| } | ||
|
|
||
| // Clone the input | ||
| clone := revision.DeepCopy() | ||
|
|
||
| // Continue to attempt to create the revision updating the name with a new hash on each iteration | ||
| for { | ||
| hash := history.HashControllerRevision(revision, collisionCount) | ||
| // Update the revisions name | ||
| clone.Name = history.ControllerRevisionName(parent.GetName(), hash) | ||
| err := r.Client.Create(context.TODO(), clone) | ||
| if errors.IsAlreadyExists(err) { | ||
| exists := &apps.ControllerRevision{} | ||
| key := types.NamespacedName{ | ||
| Namespace: clone.Namespace, | ||
| Name: clone.Name, | ||
| } | ||
| err = r.Client.Get(context.TODO(), key, exists) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if bytes.Equal(exists.Data.Raw, clone.Data.Raw) { | ||
| return exists, nil | ||
| } | ||
| *collisionCount++ | ||
| continue | ||
| } | ||
| return clone, err | ||
| } | ||
| } | ||
|
|
||
| func copySidecarSetSpecRevision(dst, src map[string]interface{}) { | ||
| // we will use patch instead of update operation to update pods in the future | ||
| // dst["$patch"] = "replace" | ||
| // only record these revisions | ||
| dst["volumes"] = src["volumes"] | ||
| dst["containers"] = src["containers"] | ||
| dst["initContainers"] = src["initContainers"] | ||
| dst["imagePullSecrets"] = src["imagePullSecrets"] | ||
| } |
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