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/*
Copyright 2020 The Kubernetes 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 storageversion
import (
"context"
"fmt"
"time"
"k8s.io/api/apiserverinternal/v1alpha1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/klog/v2"
)
// Client has the methods required to update the storage version.
type Client interface {
Create(context.Context, *v1alpha1.StorageVersion, metav1.CreateOptions) (*v1alpha1.StorageVersion, error)
UpdateStatus(context.Context, *v1alpha1.StorageVersion, metav1.UpdateOptions) (*v1alpha1.StorageVersion, error)
Get(context.Context, string, metav1.GetOptions) (*v1alpha1.StorageVersion, error)
}
// SetCommonEncodingVersion updates the CommonEncodingVersion and the AllEncodingVersionsEqual
// condition based on the StorageVersions.
func SetCommonEncodingVersion(sv *v1alpha1.StorageVersion) {
var oldCommonEncodingVersion *string
if sv.Status.CommonEncodingVersion != nil {
version := *sv.Status.CommonEncodingVersion
oldCommonEncodingVersion = &version
}
sv.Status.CommonEncodingVersion = nil
if len(sv.Status.StorageVersions) != 0 {
firstVersion := sv.Status.StorageVersions[0].EncodingVersion
agreed := true
for _, ssv := range sv.Status.StorageVersions {
if ssv.EncodingVersion != firstVersion {
agreed = false
break
}
}
if agreed {
sv.Status.CommonEncodingVersion = &firstVersion
}
}
condition := v1alpha1.StorageVersionCondition{
Type: v1alpha1.AllEncodingVersionsEqual,
Status: v1alpha1.ConditionFalse,
ObservedGeneration: sv.Generation,
LastTransitionTime: metav1.NewTime(time.Now()),
Reason: "CommonEncodingVersionUnset",
Message: "Common encoding version unset",
}
if sv.Status.CommonEncodingVersion != nil {
condition.Status = v1alpha1.ConditionTrue
condition.Reason = "CommonEncodingVersionSet"
condition.Message = "Common encoding version set"
}
forceTransition := false
if oldCommonEncodingVersion != nil && sv.Status.CommonEncodingVersion != nil &&
*oldCommonEncodingVersion != *sv.Status.CommonEncodingVersion {
forceTransition = true
}
setStatusCondition(&sv.Status.Conditions, condition, forceTransition)
}
func findStatusCondition(conditions []v1alpha1.StorageVersionCondition,
conditionType v1alpha1.StorageVersionConditionType) *v1alpha1.StorageVersionCondition {
for i := range conditions {
if conditions[i].Type == conditionType {
return &conditions[i]
}
}
return nil
}
// setStatusCondition sets the corresponding condition in conditions to newCondition.
// conditions must be non-nil.
// 1. if the condition of the specified type already exists: all fields of the existing condition are updated to
// newCondition, LastTransitionTime is set to now if the new status differs from the old status
// 2. if a condition of the specified type does not exist: LastTransitionTime is set to now() if unset,
// and newCondition is appended
//
// NOTE: forceTransition allows overwriting LastTransitionTime even when the status doesn't change.
func setStatusCondition(conditions *[]v1alpha1.StorageVersionCondition, newCondition v1alpha1.StorageVersionCondition,
forceTransition bool) {
if conditions == nil {
return
}
if newCondition.LastTransitionTime.IsZero() {
newCondition.LastTransitionTime = metav1.NewTime(time.Now())
}
existingCondition := findStatusCondition(*conditions, newCondition.Type)
if existingCondition == nil {
*conditions = append(*conditions, newCondition)
return
}
statusChanged := existingCondition.Status != newCondition.Status
if statusChanged || forceTransition {
existingCondition.LastTransitionTime = newCondition.LastTransitionTime
}
existingCondition.Status = newCondition.Status
existingCondition.Reason = newCondition.Reason
existingCondition.Message = newCondition.Message
existingCondition.ObservedGeneration = newCondition.ObservedGeneration
}
// updateStorageVersionFor updates the storage version object for the resource.
func updateStorageVersionFor(c Client, apiserverID string, gr schema.GroupResource, encodingVersion string, decodableVersions []string, servedVersions []string) error {
retries := 3
var retry int
var err error
for retry < retries {
err = singleUpdate(c, apiserverID, gr, encodingVersion, decodableVersions, servedVersions)
if err == nil {
return nil
}
if apierrors.IsAlreadyExists(err) || apierrors.IsConflict(err) {
time.Sleep(1 * time.Second)
continue
}
if err != nil {
klog.Errorf("retry %d, failed to update storage version for %v: %v", retry, gr, err)
retry++
time.Sleep(1 * time.Second)
}
}
return err
}
func singleUpdate(c Client, apiserverID string, gr schema.GroupResource, encodingVersion string, decodableVersions []string, servedVersions []string) error {
shouldCreate := false
name := fmt.Sprintf("%s.%s", gr.Group, gr.Resource)
sv, err := c.Get(context.TODO(), name, metav1.GetOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return err
}
if apierrors.IsNotFound(err) {
shouldCreate = true
sv = &v1alpha1.StorageVersion{}
sv.ObjectMeta.Name = name
}
updatedSV := localUpdateStorageVersion(sv, apiserverID, encodingVersion, decodableVersions, servedVersions)
if shouldCreate {
createdSV, err := c.Create(context.TODO(), updatedSV, metav1.CreateOptions{})
if err != nil {
return err
}
// assign the calculated status to the object just created, then update status
createdSV.Status = updatedSV.Status
_, err = c.UpdateStatus(context.TODO(), createdSV, metav1.UpdateOptions{})
return err
}
_, err = c.UpdateStatus(context.TODO(), updatedSV, metav1.UpdateOptions{})
return err
}
// localUpdateStorageVersion updates the input storageversion with given server storageversion info.
// The function updates the input storageversion in place.
func localUpdateStorageVersion(sv *v1alpha1.StorageVersion, apiserverID, encodingVersion string, decodableVersions []string, servedVersions []string) *v1alpha1.StorageVersion {
newSSV := v1alpha1.ServerStorageVersion{
APIServerID: apiserverID,
EncodingVersion: encodingVersion,
DecodableVersions: decodableVersions,
ServedVersions: servedVersions,
}
foundSSV := false
for i, ssv := range sv.Status.StorageVersions {
if ssv.APIServerID == apiserverID {
sv.Status.StorageVersions[i] = newSSV
foundSSV = true
break
}
}
if !foundSSV {
sv.Status.StorageVersions = append(sv.Status.StorageVersions, newSSV)
}
SetCommonEncodingVersion(sv)
return sv
}
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