forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
leaselock.go
124 lines (109 loc) · 3.96 KB
/
leaselock.go
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
/*
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 resourcelock
import (
"errors"
"fmt"
coordinationv1 "k8s.io/api/coordination/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
coordinationv1client "k8s.io/client-go/kubernetes/typed/coordination/v1"
)
type LeaseLock struct {
// LeaseMeta should contain a Name and a Namespace of a
// LeaseMeta object that the LeaderElector will attempt to lead.
LeaseMeta metav1.ObjectMeta
Client coordinationv1client.LeasesGetter
LockConfig ResourceLockConfig
lease *coordinationv1.Lease
}
// Get returns the election record from a Lease spec
func (ll *LeaseLock) Get() (*LeaderElectionRecord, error) {
var err error
ll.lease, err = ll.Client.Leases(ll.LeaseMeta.Namespace).Get(ll.LeaseMeta.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
return LeaseSpecToLeaderElectionRecord(&ll.lease.Spec), nil
}
// Create attempts to create a Lease
func (ll *LeaseLock) Create(ler LeaderElectionRecord) error {
var err error
ll.lease, err = ll.Client.Leases(ll.LeaseMeta.Namespace).Create(&coordinationv1.Lease{
ObjectMeta: metav1.ObjectMeta{
Name: ll.LeaseMeta.Name,
Namespace: ll.LeaseMeta.Namespace,
},
Spec: LeaderElectionRecordToLeaseSpec(&ler),
})
return err
}
// Update will update an existing Lease spec.
func (ll *LeaseLock) Update(ler LeaderElectionRecord) error {
if ll.lease == nil {
return errors.New("lease not initialized, call get or create first")
}
ll.lease.Spec = LeaderElectionRecordToLeaseSpec(&ler)
var err error
ll.lease, err = ll.Client.Leases(ll.LeaseMeta.Namespace).Update(ll.lease)
return err
}
// RecordEvent in leader election while adding meta-data
func (ll *LeaseLock) RecordEvent(s string) {
if ll.LockConfig.EventRecorder == nil {
return
}
events := fmt.Sprintf("%v %v", ll.LockConfig.Identity, s)
ll.LockConfig.EventRecorder.Eventf(&coordinationv1.Lease{ObjectMeta: ll.lease.ObjectMeta}, corev1.EventTypeNormal, "LeaderElection", events)
}
// Describe is used to convert details on current resource lock
// into a string
func (ll *LeaseLock) Describe() string {
return fmt.Sprintf("%v/%v", ll.LeaseMeta.Namespace, ll.LeaseMeta.Name)
}
// returns the Identity of the lock
func (ll *LeaseLock) Identity() string {
return ll.LockConfig.Identity
}
func LeaseSpecToLeaderElectionRecord(spec *coordinationv1.LeaseSpec) *LeaderElectionRecord {
holderIdentity := ""
if spec.HolderIdentity != nil {
holderIdentity = *spec.HolderIdentity
}
leaseDurationSeconds := 0
if spec.LeaseDurationSeconds != nil {
leaseDurationSeconds = int(*spec.LeaseDurationSeconds)
}
leaseTransitions := 0
if spec.LeaseTransitions != nil {
leaseTransitions = int(*spec.LeaseTransitions)
}
return &LeaderElectionRecord{
HolderIdentity: holderIdentity,
LeaseDurationSeconds: leaseDurationSeconds,
AcquireTime: metav1.Time{spec.AcquireTime.Time},
RenewTime: metav1.Time{spec.RenewTime.Time},
LeaderTransitions: leaseTransitions,
}
}
func LeaderElectionRecordToLeaseSpec(ler *LeaderElectionRecord) coordinationv1.LeaseSpec {
leaseDurationSeconds := int32(ler.LeaseDurationSeconds)
leaseTransitions := int32(ler.LeaderTransitions)
return coordinationv1.LeaseSpec{
HolderIdentity: &ler.HolderIdentity,
LeaseDurationSeconds: &leaseDurationSeconds,
AcquireTime: &metav1.MicroTime{ler.AcquireTime.Time},
RenewTime: &metav1.MicroTime{ler.RenewTime.Time},
LeaseTransitions: &leaseTransitions,
}
}