b72230379f
With kubernetes 1.18 release of client-go, signatures on methods in generated clientsets, dynamic, metadata, and scale clients have been modified to accept context.Context as a first argument. Signatures of Create, Update, and Patch methods have been updated to accept CreateOptions, UpdateOptions and PatchOptions respectively. Signatures of Delete and DeleteCollection methods now accept DeleteOptions by value instead of by reference. These changes are now accommodated with this PR and client-go and dependencies are updated to v1.18.0 Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
115 lines
3.7 KiB
Go
115 lines
3.7 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package resourcelock
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
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)
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// TODO: This is almost a exact replica of Endpoints lock.
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// going forwards as we self host more and more components
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// and use ConfigMaps as the means to pass that configuration
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// data we will likely move to deprecate the Endpoints lock.
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type ConfigMapLock struct {
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// ConfigMapMeta should contain a Name and a Namespace of a
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// ConfigMapMeta object that the LeaderElector will attempt to lead.
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ConfigMapMeta metav1.ObjectMeta
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Client corev1client.ConfigMapsGetter
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LockConfig ResourceLockConfig
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cm *v1.ConfigMap
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}
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// Get returns the election record from a ConfigMap Annotation
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func (cml *ConfigMapLock) Get(ctx context.Context) (*LeaderElectionRecord, []byte, error) {
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var record LeaderElectionRecord
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var err error
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cml.cm, err = cml.Client.ConfigMaps(cml.ConfigMapMeta.Namespace).Get(ctx, cml.ConfigMapMeta.Name, metav1.GetOptions{})
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if err != nil {
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return nil, nil, err
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}
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if cml.cm.Annotations == nil {
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cml.cm.Annotations = make(map[string]string)
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}
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recordBytes, found := cml.cm.Annotations[LeaderElectionRecordAnnotationKey]
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if found {
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if err := json.Unmarshal([]byte(recordBytes), &record); err != nil {
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return nil, nil, err
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}
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}
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return &record, []byte(recordBytes), nil
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}
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// Create attempts to create a LeaderElectionRecord annotation
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func (cml *ConfigMapLock) Create(ctx context.Context, ler LeaderElectionRecord) error {
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recordBytes, err := json.Marshal(ler)
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if err != nil {
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return err
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}
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cml.cm, err = cml.Client.ConfigMaps(cml.ConfigMapMeta.Namespace).Create(ctx, &v1.ConfigMap{
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ObjectMeta: metav1.ObjectMeta{
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Name: cml.ConfigMapMeta.Name,
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Namespace: cml.ConfigMapMeta.Namespace,
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Annotations: map[string]string{
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LeaderElectionRecordAnnotationKey: string(recordBytes),
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},
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},
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}, metav1.CreateOptions{})
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return err
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}
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// Update will update an existing annotation on a given resource.
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func (cml *ConfigMapLock) Update(ctx context.Context, ler LeaderElectionRecord) error {
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if cml.cm == nil {
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return errors.New("configmap not initialized, call get or create first")
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}
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recordBytes, err := json.Marshal(ler)
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if err != nil {
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return err
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}
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cml.cm.Annotations[LeaderElectionRecordAnnotationKey] = string(recordBytes)
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cml.cm, err = cml.Client.ConfigMaps(cml.ConfigMapMeta.Namespace).Update(ctx, cml.cm, metav1.UpdateOptions{})
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return err
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}
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// RecordEvent in leader election while adding meta-data
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func (cml *ConfigMapLock) RecordEvent(s string) {
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if cml.LockConfig.EventRecorder == nil {
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return
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}
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events := fmt.Sprintf("%v %v", cml.LockConfig.Identity, s)
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cml.LockConfig.EventRecorder.Eventf(&v1.ConfigMap{ObjectMeta: cml.cm.ObjectMeta}, v1.EventTypeNormal, "LeaderElection", events)
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}
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// Describe is used to convert details on current resource lock
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// into a string
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func (cml *ConfigMapLock) Describe() string {
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return fmt.Sprintf("%v/%v", cml.ConfigMapMeta.Namespace, cml.ConfigMapMeta.Name)
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}
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// Identity returns the Identity of the lock
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func (cml *ConfigMapLock) Identity() string {
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return cml.LockConfig.Identity
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}
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