| /* |
| 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" |
| |
| "k8s.io/api/core/v1" |
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| corev1client "k8s.io/client-go/kubernetes/typed/core/v1" |
| ) |
| |
| 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 corev1client.EndpointsGetter |
| LockConfig ResourceLockConfig |
| e *v1.Endpoints |
| } |
| |
| // Get returns the election record from a Endpoints Annotation |
| func (el *EndpointsLock) Get() (*LeaderElectionRecord, error) { |
| var record LeaderElectionRecord |
| var err error |
| el.e, err = el.Client.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.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.Endpoints(el.EndpointsMeta.Namespace).Update(el.e) |
| return err |
| } |
| |
| // RecordEvent in leader election while adding meta-data |
| func (el *EndpointsLock) RecordEvent(s string) { |
| if el.LockConfig.EventRecorder == nil { |
| return |
| } |
| 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 |
| } |