/
controller.go
317 lines (275 loc) · 10.2 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
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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
package controller
import (
"fmt"
"time"
schedulepkg "github.com/lilic/kube-start-stop/pkg/schedule"
appsv1beta2 "k8s.io/api/apps/v1beta2"
autoscaling "k8s.io/api/autoscaling/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/scale"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
schedv1alpha1 "github.com/lilic/kube-start-stop/pkg/apis/schedule/v1alpha1"
clientset "github.com/lilic/kube-start-stop/pkg/client/clientset/versioned"
schedscheme "github.com/lilic/kube-start-stop/pkg/client/clientset/versioned/scheme"
informers "github.com/lilic/kube-start-stop/pkg/client/informers/externalversions"
listers "github.com/lilic/kube-start-stop/pkg/client/listers/schedule/v1alpha1"
)
const controllerAgentName = "schedule-controller"
const (
// SuccessSynced is used as part of the Event 'reason' when a sched is synced
SuccessSynced = "Synced"
// ErrResourceExists is used as part of the Event 'reason' when a sched fails
// to sync due to a Deployment of the same name already existing.
ErrResourceExists = "ErrResourceExists"
// MessageResourceExists is the message used for Events when a resource
// fails to sync due to a Deployment already existing
MessageResourceExists = "Resource %q already exists and is not managed by Schedule controller"
// MessageResourceSynced is the message used for an Event fired when a sched
// is synced successfully
MessageResourceSynced = "Schedule controller synced successfully"
)
// Controller is the controller implementation for Scheduler resources
type Controller struct {
// kubeclientset is a standard kubernetes clientset
kubeclientset kubernetes.Interface
scaleclientset scale.ScalesGetter
schedclientset clientset.Interface
schedsLister listers.ScheduleLister
schedsSynced cache.InformerSynced
schedsInformer cache.SharedIndexInformer
// workqueue is a rate limited work queue. This is used to queue work to be
// processed instead of performing it as soon as a change happens. This
// means we can ensure we only process a fixed amount of resources at a
// time, and makes it easy to ensure we are never processing the same item
// simultaneously in two different workers.
workqueue workqueue.RateLimitingInterface
// recorder is an event recorder for recording Event resources to the
// Kubernetes API.
recorder record.EventRecorder
}
// NewController returns a new Scheduler controller
func NewController(kubeclientset kubernetes.Interface, scaleclientset scale.ScalesGetter, schedclientset clientset.Interface, kubeInformerFactory kubeinformers.SharedInformerFactory, schedInformerFactory informers.SharedInformerFactory) *Controller {
// obtain references to shared index informers for the Deployment and sched
// types.
schedInformer := schedInformerFactory.Schedule().V1alpha1().Schedules()
// Create event broadcaster
// Add sched-controller types to the default Kubernetes Scheme so Events can be
// logged for sched-controller types.
schedscheme.AddToScheme(scheme.Scheme)
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeclientset.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: controllerAgentName})
controller := &Controller{
kubeclientset: kubeclientset,
scaleclientset: scaleclientset,
schedclientset: schedclientset,
schedsLister: schedInformer.Lister(),
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "Schedules"),
recorder: recorder,
}
return controller
}
func (c *Controller) cacheSchedules() {
source := cache.NewListWatchFromClient(
c.schedclientset.ScheduleV1alpha1().RESTClient(),
"schedules",
corev1.NamespaceAll,
fields.Everything())
c.schedsInformer = cache.NewSharedIndexInformer(
source,
&schedv1alpha1.Schedule{},
1*time.Minute,
cache.Indexers{},
)
c.schedsInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.handleSchedAdd,
UpdateFunc: c.handleSchedUpdate,
DeleteFunc: c.handleSchedDelete,
})
c.schedsSynced = c.schedsInformer.HasSynced
}
func (c *Controller) handleSchedAdd(obj interface{}) {
s, ok := obj.(*schedv1alpha1.Schedule)
if !ok {
fmt.Println("failed to cast object")
return
}
c.sync(s)
}
func (c *Controller) handleSchedUpdate(oldobj interface{}, newobj interface{}) {
s, ok := newobj.(*schedv1alpha1.Schedule)
if !ok {
fmt.Println("failed to cast object")
return
}
c.sync(s)
}
func (c *Controller) handleSchedDelete(obj interface{}) {
}
// Run will set up the event handlers for types we are interested in, as well
// as syncing informer caches and starting workers. It will block until stopCh
// is closed, at which point it will shutdown the workqueue and wait for
// workers to finish processing their current work items.
func (c *Controller) Run(threadiness int, stopCh <-chan struct{}) error {
defer runtime.HandleCrash()
defer c.workqueue.ShutDown()
c.cacheSchedules()
go c.schedsInformer.Run(stopCh)
// Start the informer factories to begin populating the informer caches
// Wait for the caches to be synced before starting workers
if !cache.WaitForCacheSync(stopCh, c.schedsSynced) {
return fmt.Errorf("failed to wait for caches to sync")
}
go wait.Until(c.runWorker, time.Second, stopCh)
<-stopCh
return nil
}
// runWorker is a long-running function that will continually call the
// processNextWorkItem function in order to read and process a message on the
// workqueue.
func (c *Controller) runWorker() {
for c.processNextWorkItem() {
}
}
// processNextWorkItem will read a single work item off the workqueue and
// attempt to process it, by calling the syncHandler.
func (c *Controller) processNextWorkItem() bool {
obj, shutdown := c.workqueue.Get()
if shutdown {
return false
}
// We wrap this block in a func so we can defer c.workqueue.Done.
err := func(obj interface{}) error {
// We call Done here so the workqueue knows we have finished
// processing this item. We also must remember to call Forget if we
// do not want this work item being re-queued. For example, we do
// not call Forget if a transient error occurs, instead the item is
// put back on the workqueue and attempted again after a back-off
// period.
defer c.workqueue.Done(obj)
var key string
var ok bool
// We expect strings to come off the workqueue. These are of the
// form namespace/name. We do this as the delayed nature of the
// workqueue means the items in the informer cache may actually be
// more up to date that when the item was initially put onto the
// workqueue.
if key, ok = obj.(string); !ok {
// As the item in the workqueue is actually invalid, we call
// Forget here else we'd go into a loop of attempting to
// process a work item that is invalid.
c.workqueue.Forget(obj)
runtime.HandleError(fmt.Errorf("expected string in workqueue but got %#v", obj))
return nil
}
// Run the syncHandler, passing it the namespace/name string of the
// sched resource to be synced.
if err := c.syncHandler(key); err != nil {
return fmt.Errorf("error syncing '%s': %s", key, err.Error())
}
// Finally, if no error occurs we Forget this item so it does not
// get queued again until another change happens.
c.workqueue.Forget(obj)
return nil
}(obj)
if err != nil {
runtime.HandleError(err)
return true
}
return true
}
// syncHandler compares the actual state with the desired, and attempts to
// converge the two. It then updates the Status block of the sched resource
// with the current status of the resource.
func (c *Controller) syncHandler(key string) error {
// Convert the namespace/name string into a distinct namespace and name
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
runtime.HandleError(fmt.Errorf("invalid resource key: %s", key))
return nil
}
// Get the sched resource with this namespace/name
sched, err := c.schedsLister.Schedules(namespace).Get(name)
if err != nil {
// The sched resource may no longer exist, in which case we stop
// processing.
if errors.IsNotFound(err) {
runtime.HandleError(fmt.Errorf("sched '%s' in work queue no longer exists", key))
return nil
}
return err
}
c.recorder.Event(sched, corev1.EventTypeNormal, SuccessSynced, MessageResourceSynced)
return nil
}
func (c *Controller) sync(sched *schedv1alpha1.Schedule) {
// check if we are in the correct time span
for _, s := range sched.Spec.Schedules {
// Translate to schedule spec
start, err := schedulepkg.ConvertWeekday(s.Start.Day)
if err != nil {
fmt.Println(err)
return
}
stop, err := schedulepkg.ConvertWeekday(s.Stop.Day)
if err != nil {
fmt.Println(err)
return
}
schedSpec := &schedulepkg.ScheduleSpec{
StartTime: schedulepkg.WeekdayTime{
Weekday: start,
TimeOfDay: schedulepkg.TimeOfDay{
Hour: s.Start.Time.Hour,
Minute: s.Start.Time.Minute,
},
},
EndTime: schedulepkg.WeekdayTime{
Weekday: stop,
TimeOfDay: schedulepkg.TimeOfDay{
Hour: s.Stop.Time.Hour,
Minute: s.Stop.Time.Minute,
},
},
}
sch := schedulepkg.New(schedSpec)
if sch.Contains(time.Now().UTC()) {
c.scaleTo(sched.Namespace, s.Selector, s.Replicas)
}
}
}
// Scale resources to desired number.
func (c *Controller) scaleTo(ns string, selector string, replicas int32) { //selector string, replicas int) {
r := &autoscaling.Scale{
TypeMeta: metav1.TypeMeta{
Kind: "Deployment",
APIVersion: "extensions/v1beta1",
},
ObjectMeta: metav1.ObjectMeta{
Name: selector,
Namespace: ns,
},
Spec: autoscaling.ScaleSpec{Replicas: replicas},
Status: autoscaling.ScaleStatus{
Replicas: replicas,
},
}
g := schema.GroupResource{Group: appsv1beta2.GroupName, Resource: "deployment"}
_, err := c.scaleclientset.Scales("default").Update(g, r)
if err != nil {
fmt.Println(err)
return
}
}