forked from kubevirt/kubevirt
/
controller.go
133 lines (119 loc) · 3.54 KB
/
controller.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
125
126
127
128
129
130
131
132
133
/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2017 Red Hat, Inc.
*
*/
package controller
import (
"runtime/debug"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"fmt"
"kubevirt.io/kubevirt/pkg/api/v1"
"kubevirt.io/kubevirt/pkg/log"
)
const (
// BurstReplicas is the maximum amount of requests in a row for CRUD operations on resources by controllers,
// to avoid unintentional DoS
BurstReplicas uint = 250
)
// NewListWatchFromClient creates a new ListWatch from the specified client, resource, namespace and field selector.
func NewListWatchFromClient(c cache.Getter, resource string, namespace string, fieldSelector fields.Selector, labelSelector labels.Selector) *cache.ListWatch {
listFunc := func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = fieldSelector.String()
options.LabelSelector = labelSelector.String()
return c.Get().
Namespace(namespace).
Resource(resource).
VersionedParams(&options, metav1.ParameterCodec).
Do().
Get()
}
watchFunc := func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = fieldSelector.String()
options.LabelSelector = labelSelector.String()
return c.Get().
Prefix("watch").
Namespace(namespace).
Resource(resource).
VersionedParams(&options, metav1.ParameterCodec).
Watch()
}
return &cache.ListWatch{ListFunc: listFunc, WatchFunc: watchFunc}
}
func HandlePanic() {
if r := recover(); r != nil {
log.Log.Level(log.CRITICAL).Log("stacktrace", debug.Stack(), "msg", r)
}
}
func NewResourceEventHandlerFuncsForWorkqueue(queue workqueue.RateLimitingInterface) cache.ResourceEventHandlerFuncs {
return cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
key, err := KeyFunc(obj)
if err == nil {
queue.Add(key)
}
},
UpdateFunc: func(old interface{}, new interface{}) {
key, err := KeyFunc(new)
if err == nil {
queue.Add(key)
}
},
DeleteFunc: func(obj interface{}) {
key, err := KeyFunc(obj)
if err == nil {
queue.Add(key)
}
},
}
}
func NewResourceEventHandlerFuncsForFunc(f func(interface{})) cache.ResourceEventHandlerFuncs {
return cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
f(obj)
},
UpdateFunc: func(old interface{}, new interface{}) {
f(new)
},
DeleteFunc: func(obj interface{}) {
f(obj)
},
}
}
func VirtualMachineKey(vm *v1.VirtualMachine) string {
return fmt.Sprintf("%v/%v", vm.ObjectMeta.Namespace, vm.ObjectMeta.Name)
}
func VirtualMachineKeys(vms []*v1.VirtualMachine) []string {
keys := []string{}
for _, vm := range vms {
keys = append(keys, VirtualMachineKey(vm))
}
return keys
}
func HasFinalizer(object metav1.Object, finalizer string) bool {
for _, f := range object.GetFinalizers() {
if f == finalizer {
return true
}
}
return false
}