/
kubernetes.go
218 lines (194 loc) · 5.89 KB
/
kubernetes.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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
package lambda
import (
"os"
"regexp"
"time"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
)
var (
versionParseRegexp = regexp.MustCompile(`v(\d+)((alpha|beta)(\d+))?`)
)
type Version string
func (v Version) GetNumericVersion() string {
matches := versionParseRegexp.FindStringSubmatch(string(v))
if len(matches) < 2 {
return ""
}
return matches[1]
}
func (v Version) GetSuffix() string {
// e.g. v1beta1,
matches := versionParseRegexp.FindStringSubmatch(string(v))
if len(matches) < 5 {
return ""
}
return matches[3] + matches[4]
}
// Resource is kubernetes resource enumeration hiding api version
type Resource struct {
Name string
Version string
}
type kubernetesExecutable struct {
Rs Resource
namespaces []string
clientInterface dynamic.Interface
informer informers.GenericInformer
}
// KubernetesClientLambda provides manipulation interface for resources
type KubernetesClientLambda interface {
Type(Resource) *kubernetesExecutable
}
type kubernetesClientLambdaImpl struct {
informerFactory informers.SharedInformerFactory
clientPool dynamic.ClientPool
}
func (kcl *kubernetesClientLambdaImpl) Type(rs Resource) *kubernetesExecutable {
gvr := GetResouceIndexerInstance().GetGroupVersionResource(rs)
i, err := kcl.clientPool.ClientForGroupVersionResource(gvr)
if err != nil {
panic(err)
}
exec := &kubernetesExecutable{
Rs: rs,
clientInterface: i,
}
if kcl.informerFactory != nil {
informer, err := kcl.informerFactory.ForResource(gvr)
if err != nil {
panic(err)
}
if informer.Informer().LastSyncResourceVersion() == "" {
kcl.informerFactory.Start(make(chan struct{}))
// TODO: set timeout for waiting cache sync
cache.WaitForCacheSync(make(chan struct{}), informer.Informer().HasSynced)
}
exec.informer = informer
}
return exec
}
func getKCLFromConfig(config *rest.Config) *kubernetesClientLambdaImpl {
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err)
}
factory := informers.NewSharedInformerFactory(clientset, time.Minute)
return &kubernetesClientLambdaImpl{
informerFactory: factory,
clientPool: dynamic.NewDynamicClientPool(config),
}
}
// OutOfClusterDefault loads configuration from ~/.kube/config
func OutOfClusterDefault() KubernetesClientLambda {
return OutOfClusterInContext("")
}
// OutOfClusterInContext is used to switch context of multi-cluster kubernetes
func OutOfClusterInContext(context string) KubernetesClientLambda {
config, err := clientcmd.LoadFromFile(os.Getenv("HOME") + "/.kube/config")
if err != nil {
panic(err)
}
if config == nil || config.Contexts == nil {
panic("something's wrong with kube config file")
}
if context != "" {
config.CurrentContext = context
}
clientConfig, err := clientcmd.NewDefaultClientConfig(*config, &clientcmd.ConfigOverrides{}).ClientConfig()
if err != nil {
panic(err)
}
return getKCLFromConfig(clientConfig)
}
func (exec *kubernetesExecutable) InNamespace(namespaces ...string) *Lambda {
rs := exec.Rs
gvk := GetResouceIndexerInstance().GetGroupVersionKind(rs)
exec.namespaces = namespaces
ch := make(chan runtime.Object)
if len(namespaces) == 0 {
exec.namespaces = []string{metav1.NamespaceAll}
}
l := &Lambda{
rs: exec.Rs,
namespaces: exec.namespaces,
val: ch,
getFunc: func(namespace, name string) (runtime.Object, error) {
return exec.informer.Lister().ByNamespace(namespace).Get(name)
},
listFunc: func(namespace string, selector labels.Selector) ([]runtime.Object, error) {
return exec.informer.Lister().ByNamespace(namespace).List(selector)
},
createFunc: func(object runtime.Object) error {
api := GetResouceIndexerInstance().GetAPIResource(rs)
accessor, err := meta.Accessor(object)
if err != nil {
return err
}
object.GetObjectKind().SetGroupVersionKind(gvk)
tmpObj, err := castObjectToUnstructured(object)
if err != nil {
return err
}
if _, err := exec.clientInterface.Resource(api, accessor.GetNamespace()).Create(tmpObj); err != nil {
return err
}
cache.WaitForCacheSync(make(chan struct{}), exec.informer.Informer().HasSynced)
return nil
},
updateFunc: func(object runtime.Object) error {
api := GetResouceIndexerInstance().GetAPIResource(rs)
accessor, err := meta.Accessor(object)
if err != nil {
return err
}
object.GetObjectKind().SetGroupVersionKind(gvk)
tmpObj, err := castObjectToUnstructured(object)
if err != nil {
return err
}
if _, err := exec.clientInterface.Resource(api, accessor.GetNamespace()).Update(tmpObj); err != nil {
return err
}
cache.WaitForCacheSync(make(chan struct{}), exec.informer.Informer().HasSynced)
return nil
},
deleteFunc: func(object runtime.Object) error {
api := GetResouceIndexerInstance().GetAPIResource(rs)
accessor, err := meta.Accessor(object)
if err != nil {
return err
}
if err := exec.clientInterface.Resource(api, accessor.GetNamespace()).Delete(accessor.GetName(), &metav1.DeleteOptions{}); err != nil {
return err
}
cache.WaitForCacheSync(make(chan struct{}), exec.informer.Informer().HasSynced)
return nil
},
}
close(ch)
return l
}
func (exec *kubernetesExecutable) OnAdd(f func(interface{})) {
exec.informer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: f,
})
}
func (exec *kubernetesExecutable) OnUpdate(f func(interface{}, interface{})) {
exec.informer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
UpdateFunc: f,
})
}
func (exec *kubernetesExecutable) OnDelete(f func(interface{})) {
exec.informer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
DeleteFunc: f,
})
}