FilesExpand file tree

 master

/

example_test.go

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

147 lines (128 loc) · 4.69 KB

 master

/

example_test.go

Copy path

Top

File metadata and controls

• Code
• Blame

147 lines (128 loc) · 4.69 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

/*

Copyright 2018 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 controllerruntime_test

import (

"context"

"fmt"

"os"

"time"

appsv1 "k8s.io/api/apps/v1"

corev1 "k8s.io/api/core/v1"

ctrl "sigs.k8s.io/controller-runtime"

"sigs.k8s.io/controller-runtime/pkg/client"

// since we invoke tests with -ginkgo.junit-report we need to import ginkgo.

_ "github.com/onsi/ginkgo/v2"

)

// This example creates a simple application Controller that is configured for ReplicaSets and Pods.

//

// * Create a new application for ReplicaSets that manages Pods owned by the ReplicaSet and calls into

// ReplicaSetReconciler.

//

// * Start the application.

// TODO(pwittrock): Update this example when we have better dependency injection support.

func Example() {

var log = ctrl.Log.WithName("builder-examples")

manager, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{})

if err != nil {

log.Error(err, "could not create manager")

os.Exit(1)

}

err = ctrl.

NewControllerManagedBy(manager). // Create the Controller

For(&appsv1.ReplicaSet{}). // ReplicaSet is the Application API

Owns(&corev1.Pod{}). // ReplicaSet owns Pods created by it

Complete(&ReplicaSetReconciler{Client: manager.GetClient()})

if err != nil {

log.Error(err, "could not create controller")

os.Exit(1)

}

if err := manager.Start(ctrl.SetupSignalHandler()); err != nil {

log.Error(err, "could not start manager")

os.Exit(1)

}

}

// This example creates a simple application Controller that is configured for ReplicaSets and Pods.

// This application controller will be running leader election with the provided configuration in the manager options.

// If leader election configuration is not provided, controller runs leader election with default values.

// Default values taken from: https://github.com/kubernetes/component-base/blob/master/config/v1alpha1/defaults.go

// * defaultLeaseDuration = 15 * time.Second

// * defaultRenewDeadline = 10 * time.Second

// * defaultRetryPeriod = 2 * time.Second

//

// * Create a new application for ReplicaSets that manages Pods owned by the ReplicaSet and calls into

// ReplicaSetReconciler.

//

// * Start the application.

// TODO(pwittrock): Update this example when we have better dependency injection support.

func Example_updateLeaderElectionDurations() {

var log = ctrl.Log.WithName("builder-examples")

leaseDuration := 100 * time.Second

renewDeadline := 80 * time.Second

retryPeriod := 20 * time.Second

manager, err := ctrl.NewManager(

ctrl.GetConfigOrDie(),

ctrl.Options{

LeaseDuration: &leaseDuration,

RenewDeadline: &renewDeadline,

RetryPeriod: &retryPeriod,

})

if err != nil {

log.Error(err, "could not create manager")

os.Exit(1)

}

err = ctrl.

NewControllerManagedBy(manager). // Create the Controller

For(&appsv1.ReplicaSet{}). // ReplicaSet is the Application API

Owns(&corev1.Pod{}). // ReplicaSet owns Pods created by it

Complete(&ReplicaSetReconciler{Client: manager.GetClient()})

if err != nil {

log.Error(err, "could not create controller")

os.Exit(1)

}

if err := manager.Start(ctrl.SetupSignalHandler()); err != nil {

log.Error(err, "could not start manager")

os.Exit(1)

}

}

// ReplicaSetReconciler is a simple Controller example implementation.

type ReplicaSetReconciler struct {

client.Client

}

// Implement the business logic:

// This function will be called when there is a change to a ReplicaSet or a Pod with an OwnerReference

// to a ReplicaSet.

//

// * Read the ReplicaSet

// * Read the Pods

// * Set a Label on the ReplicaSet with the Pod count.

func (a *ReplicaSetReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {

// Read the ReplicaSet

rs := &appsv1.ReplicaSet{}

err := a.Get(ctx, req.NamespacedName, rs)

if err != nil {

return ctrl.Result{}, err

}

// List the Pods matching the PodTemplate Labels

pods := &corev1.PodList{}

err = a.List(ctx, pods, client.InNamespace(req.Namespace), client.MatchingLabels(rs.Spec.Template.Labels))

if err != nil {

return ctrl.Result{}, err

}

// Update the ReplicaSet

rs.Labels["pod-count"] = fmt.Sprintf("%v", len(pods.Items))

err = a.Update(context.TODO(), rs)

if err != nil {

return ctrl.Result{}, err

}

return ctrl.Result{}, nil

}