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rollout.go
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rollout.go
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// Copyright 2017 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 deployment
import (
"context"
"errors"
"time"
v1 "k8s.io/api/apps/v1"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
client "k8s.io/client-go/kubernetes"
)
const (
// FirstRevision is a first revision number
FirstRevision = "1"
// RestartedAtAnnotationKey is an annotation key for rollout restart
RestartedAtAnnotationKey = "kubectl.kubernetes.io/restartedAt"
// RevisionAnnotationKey is an annotation key for rollout targeted or resulted revision
RevisionAnnotationKey = "deployment.kubernetes.io/revision"
)
// RolloutSpec is a specification for deployment rollout
type RolloutSpec struct {
// Revision is the requested/resulted revision number of the ReplicateSet to rollback.
Revision string `json:"revision"`
}
// RollbackDeployment rollback to a specific ReplicaSet revision
func RollbackDeployment(client client.Interface, rolloutSpec *RolloutSpec, namespace, name string) (*RolloutSpec, error) {
deployment, err := client.AppsV1().Deployments(namespace).Get(context.TODO(), name, metaV1.GetOptions{})
if err != nil {
return nil, err
}
currRevision := deployment.Annotations[RevisionAnnotationKey]
if currRevision == FirstRevision {
return nil, errors.New("No revision for rolling back ")
}
matchRS, err := GetReplicaSetFromDeployment(client, namespace, name)
if err != nil {
return nil, err
}
for _, rs := range matchRS {
if rs.Annotations[RevisionAnnotationKey] == rolloutSpec.Revision {
updateDeployment := deployment.DeepCopy()
updateDeployment.Spec.Template.Spec = rs.Spec.Template.Spec
res, err := client.AppsV1().Deployments(namespace).Update(context.TODO(), updateDeployment, metaV1.UpdateOptions{})
if err != nil {
return nil, err
}
return &RolloutSpec{
Revision: res.Annotations[RevisionAnnotationKey],
}, nil
}
}
return nil, errors.New("There is no ReplicaSet that has the requested revision for the Deployment.")
}
// PauseDeployment is used to pause a deployment
func PauseDeployment(client client.Interface, namespace, name string) (*v1.Deployment, error) {
deployment, err := client.AppsV1().Deployments(namespace).Get(context.TODO(), name, metaV1.GetOptions{})
if err != nil {
return nil, err
}
if !deployment.Spec.Paused {
deployment.Spec.Paused = true
_, err = client.AppsV1().Deployments(namespace).Update(context.TODO(), deployment, metaV1.UpdateOptions{})
if err != nil {
return nil, err
}
return deployment, nil
}
return nil, errors.New("The Deployment is already paused.")
}
// ResumeDeployment is used to resume a deployment
func ResumeDeployment(client client.Interface, namespace, name string) (*v1.Deployment, error) {
deployment, err := client.AppsV1().Deployments(namespace).Get(context.TODO(), name, metaV1.GetOptions{})
if err != nil {
return nil, err
}
if deployment.Spec.Paused {
deployment.Spec.Paused = false
_, err = client.AppsV1().Deployments(namespace).Update(context.TODO(), deployment, metaV1.UpdateOptions{})
if err != nil {
return nil, err
}
return deployment, nil
}
return nil, errors.New("The deployment is already resumed.")
}
// RestartDeployment restarts a deployment in the manner of `kubectl rollout restart`.
func RestartDeployment(client client.Interface, namespace, name string) (*RolloutSpec, error) {
deployment, err := client.AppsV1().Deployments(namespace).Get(context.TODO(), name, metaV1.GetOptions{})
if err != nil {
return nil, err
}
if deployment.Spec.Template.ObjectMeta.Annotations == nil {
deployment.Spec.Template.ObjectMeta.Annotations = map[string]string{}
}
deployment.Spec.Template.ObjectMeta.Annotations[RestartedAtAnnotationKey] = time.Now().Format(time.RFC3339)
res, err := client.AppsV1().Deployments(namespace).Update(context.TODO(), deployment, metaV1.UpdateOptions{})
if err != nil {
return nil, err
}
return &RolloutSpec{
Revision: res.Annotations[RevisionAnnotationKey],
}, nil
}
// GetReplicaSetFromDeployment return all replicaSet which is belong to the deployment
func GetReplicaSetFromDeployment(client client.Interface, namespace, name string) ([]v1.ReplicaSet, error) {
deployment, err := client.AppsV1().Deployments(namespace).Get(context.TODO(), name, metaV1.GetOptions{})
if err != nil {
return nil, err
}
selector, err := metaV1.LabelSelectorAsSelector(deployment.Spec.Selector)
if err != nil {
return nil, err
}
options := metaV1.ListOptions{LabelSelector: selector.String()}
allRS, err := client.AppsV1().ReplicaSets(namespace).List(context.TODO(), options)
if err != nil {
return nil, err
}
var result []v1.ReplicaSet
for _, rs := range allRS.Items {
if metaV1.IsControlledBy(&rs, deployment) {
result = append(result, rs)
}
}
return result, nil
}