103 lines
3.2 KiB
Go
103 lines
3.2 KiB
Go
/*
|
|
Copyright 2016 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 resourcelock
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/kubernetes/pkg/api/v1"
|
|
"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
|
|
)
|
|
|
|
type EndpointsLock struct {
|
|
// EndpointsMeta should contain a Name and a Namespace of an
|
|
// Endpoints object that the LeaderElector will attempt to lead.
|
|
EndpointsMeta metav1.ObjectMeta
|
|
Client clientset.Interface
|
|
LockConfig ResourceLockConfig
|
|
e *v1.Endpoints
|
|
}
|
|
|
|
func (el *EndpointsLock) Get() (*LeaderElectionRecord, error) {
|
|
var record LeaderElectionRecord
|
|
var err error
|
|
el.e, err = el.Client.Core().Endpoints(el.EndpointsMeta.Namespace).Get(el.EndpointsMeta.Name, metav1.GetOptions{})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if el.e.Annotations == nil {
|
|
el.e.Annotations = make(map[string]string)
|
|
}
|
|
if recordBytes, found := el.e.Annotations[LeaderElectionRecordAnnotationKey]; found {
|
|
if err := json.Unmarshal([]byte(recordBytes), &record); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return &record, nil
|
|
}
|
|
|
|
// Create attempts to create a LeaderElectionRecord annotation
|
|
func (el *EndpointsLock) Create(ler LeaderElectionRecord) error {
|
|
recordBytes, err := json.Marshal(ler)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
el.e, err = el.Client.Core().Endpoints(el.EndpointsMeta.Namespace).Create(&v1.Endpoints{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: el.EndpointsMeta.Name,
|
|
Namespace: el.EndpointsMeta.Namespace,
|
|
Annotations: map[string]string{
|
|
LeaderElectionRecordAnnotationKey: string(recordBytes),
|
|
},
|
|
},
|
|
})
|
|
return err
|
|
}
|
|
|
|
// Update will update and existing annotation on a given resource.
|
|
func (el *EndpointsLock) Update(ler LeaderElectionRecord) error {
|
|
if el.e == nil {
|
|
return errors.New("endpoint not initialized, call get or create first")
|
|
}
|
|
recordBytes, err := json.Marshal(ler)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
el.e.Annotations[LeaderElectionRecordAnnotationKey] = string(recordBytes)
|
|
el.e, err = el.Client.Core().Endpoints(el.EndpointsMeta.Namespace).Update(el.e)
|
|
return err
|
|
}
|
|
|
|
// RecordEvent in leader election while adding meta-data
|
|
func (el *EndpointsLock) RecordEvent(s string) {
|
|
events := fmt.Sprintf("%v %v", el.LockConfig.Identity, s)
|
|
el.LockConfig.EventRecorder.Eventf(&v1.Endpoints{ObjectMeta: el.e.ObjectMeta}, v1.EventTypeNormal, "LeaderElection", events)
|
|
}
|
|
|
|
// Describe is used to convert details on current resource lock
|
|
// into a string
|
|
func (el *EndpointsLock) Describe() string {
|
|
return fmt.Sprintf("%v/%v", el.EndpointsMeta.Namespace, el.EndpointsMeta.Name)
|
|
}
|
|
|
|
// returns the Identity of the lock
|
|
func (el *EndpointsLock) Identity() string {
|
|
return el.LockConfig.Identity
|
|
}
|