-
Notifications
You must be signed in to change notification settings - Fork 2
/
controller.go
147 lines (126 loc) · 3.91 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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
package app
import (
"context"
"errors"
"math/rand"
"time"
"github.com/castai/kvisor/pkg/logging"
"github.com/samber/lo"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
func newController(log *logging.Logger, client kubernetes.Interface) *controller {
return &controller{
log: log.WithField("component", "ctrl"),
client: client,
rnd: rand.New(rand.NewSource(time.Now().Unix())), //nolint:gosec
}
}
type controller struct {
client kubernetes.Interface
log *logging.Logger
rnd *rand.Rand
}
func (c *controller) run(ctx context.Context) error {
c.log.Info("running kvisor events generator")
defer c.log.Info("stopping kvisor events generator")
go func() {
for {
select {
case <-ctx.Done():
return
case <-time.After(5 * time.Minute):
if err := c.removeRunnerContainer(ctx); err != nil {
c.log.Errorf("remove runner container: %v", err)
}
}
}
}()
for {
rndDur := time.Duration(c.rnd.Intn(10)+1) * time.Minute
c.log.Debugf("next inject after %s", rndDur)
select {
case <-ctx.Done():
return nil
case <-time.After(rndDur):
if err := c.injectRunnerContainer(ctx); err != nil {
c.log.Errorf("inject runner container: %v", err)
}
}
}
}
func (c *controller) injectRunnerContainer(ctx context.Context) error {
c.log.Debugf("running inject")
dep, err := c.selectRandomDeployment(ctx)
if err != nil {
return err
}
c.log.Debugf("selected deployment, name=%s", dep.Name)
if lo.ContainsBy(dep.Spec.Template.Spec.InitContainers, func(item corev1.Container) bool {
return item.Name == "kvisor-anomaly-runner"
}) {
c.log.Debugf("skipping, deployment already contains event runner init container")
return nil
}
imgName, err := c.getGeneratorImageName(ctx)
if err != nil {
return err
}
dep.Spec.Template.Spec.InitContainers = append(dep.Spec.Template.Spec.InitContainers, corev1.Container{
Name: "kvisor-anomaly-runner",
Image: imgName,
Args: []string{
"-mode=event-runner",
},
})
dep.ObjectMeta.Annotations["kvisor-anomaly-runner"] = "true"
if _, err := c.client.AppsV1().Deployments(dep.Namespace).Update(ctx, dep, metav1.UpdateOptions{}); err != nil {
return err
}
c.log.Debugf("injected event runner init container")
return nil
}
func (c *controller) removeRunnerContainer(ctx context.Context) error {
c.log.Debugf("running cleanup")
list, err := c.client.AppsV1().Deployments(metav1.NamespaceAll).List(ctx, metav1.ListOptions{})
if err != nil {
return err
}
for _, item := range list.Items {
item := item
if _, found := item.ObjectMeta.Annotations["kvisor-anomaly-runner"]; found {
item.Spec.Template.Spec.InitContainers = lo.Filter(item.Spec.Template.Spec.InitContainers, func(item corev1.Container, index int) bool {
return item.Name != "kvisor-anomaly-runner"
})
delete(item.ObjectMeta.Annotations, "kvisor-anomaly-runner")
if _, err := c.client.AppsV1().Deployments(item.Namespace).Update(ctx, &item, metav1.UpdateOptions{}); err != nil {
return err
}
c.log.Debugf("removed event runner init container from deployment, name=%s", item.Name)
}
}
return nil
}
func (c *controller) selectRandomDeployment(ctx context.Context) (*appsv1.Deployment, error) {
list, err := c.client.AppsV1().Deployments(metav1.NamespaceAll).List(ctx, metav1.ListOptions{})
if err != nil {
return nil, err
}
list.Items = lo.Filter(list.Items, func(item appsv1.Deployment, index int) bool {
return item.Namespace != "kvisor"
})
if len(list.Items) == 0 {
return nil, errors.New("no deployments")
}
di := c.rnd.Intn(len(list.Items))
return &list.Items[di], nil
}
func (c *controller) getGeneratorImageName(ctx context.Context) (string, error) {
dep, err := c.client.AppsV1().Deployments("kvisor").Get(ctx, "kvisor-event-generator", metav1.GetOptions{})
if err != nil {
return "", err
}
return dep.Spec.Template.Spec.Containers[0].Image, nil
}