leader_election.go

Documentation: sigs.k8s.io/controller-runtime/pkg/leaderelection/fake

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package fake
    18  
    19  import (
    20  	"context"
    21  	"encoding/json"
    22  	"os"
    23  	"time"
    24  
    25  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    26  	"k8s.io/apimachinery/pkg/util/uuid"
    27  	"k8s.io/client-go/rest"
    28  	"k8s.io/client-go/tools/leaderelection/resourcelock"
    29  	"sigs.k8s.io/controller-runtime/pkg/leaderelection"
    30  	"sigs.k8s.io/controller-runtime/pkg/recorder"
    31  )
    32  
    33  // NewResourceLock creates a new ResourceLock for use in testing
    34  // leader election.
    35  func NewResourceLock(config *rest.Config, recorderProvider recorder.Provider, options leaderelection.Options) (resourcelock.Interface, error) {
    36  	// Leader id, needs to be unique
    37  	id, err := os.Hostname()
    38  	if err != nil {
    39  		return nil, err
    40  	}
    41  	id = id + "_" + string(uuid.NewUUID())
    42  
    43  	return &ResourceLock{
    44  		id: id,
    45  		record: resourcelock.LeaderElectionRecord{
    46  			HolderIdentity:       id,
    47  			LeaseDurationSeconds: 15,
    48  			AcquireTime:          metav1.NewTime(time.Now()),
    49  			RenewTime:            metav1.NewTime(time.Now().Add(15 * time.Second)),
    50  			LeaderTransitions:    1,
    51  		},
    52  	}, nil
    53  }
    54  
    55  // ResourceLock implements the ResourceLockInterface.
    56  // By default returns that the current identity holds the lock.
    57  type ResourceLock struct {
    58  	id     string
    59  	record resourcelock.LeaderElectionRecord
    60  }
    61  
    62  // Get implements the ResourceLockInterface.
    63  func (f *ResourceLock) Get(ctx context.Context) (*resourcelock.LeaderElectionRecord, []byte, error) {
    64  	recordBytes, err := json.Marshal(f.record)
    65  	if err != nil {
    66  		return nil, nil, err
    67  	}
    68  	return &f.record, recordBytes, nil
    69  }
    70  
    71  // Create implements the ResourceLockInterface.
    72  func (f *ResourceLock) Create(ctx context.Context, ler resourcelock.LeaderElectionRecord) error {
    73  	f.record = ler
    74  	return nil
    75  }
    76  
    77  // Update implements the ResourceLockInterface.
    78  func (f *ResourceLock) Update(ctx context.Context, ler resourcelock.LeaderElectionRecord) error {
    79  	f.record = ler
    80  	return nil
    81  }
    82  
    83  // RecordEvent implements the ResourceLockInterface.
    84  func (f *ResourceLock) RecordEvent(s string) {
    85  
    86  }
    87  
    88  // Identity implements the ResourceLockInterface.
    89  func (f *ResourceLock) Identity() string {
    90  	return f.id
    91  }
    92  
    93  // Describe implements the ResourceLockInterface.
    94  func (f *ResourceLock) Describe() string {
    95  	return f.id
    96  }
    97
View as plain text