/
daemonset.go
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/
daemonset.go
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/*
Copyright (C) GRyCAP - I3M - UPV
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 imagepuller
//TODO check error control
import (
//"k8s.io/apimachinery/pkg/watch"
"context"
"fmt"
"log"
"math/rand"
"os"
"sync"
"time"
"github.com/grycap/oscar/v2/pkg/types"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/informers"
"k8s.io/client-go/informers/internalinterfaces"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
)
var DaemonSetLoggerInfo = log.New(os.Stdout, "[DAEMONSET-INFO] ", log.Flags())
const letterBytes = "abcdefghijklmnopqrstuvwxyz"
const lengthStr = 5
var podGroup string
var daemonsetName string
var workingNodes int
type PodCounter struct {
wnCount int
mutex sync.Mutex
}
var pc PodCounter
var stopper chan struct{}
//Create daemonset
func CreateDaemonset(cfg *types.Config, service types.Service, kubeClientset kubernetes.Interface) error {
//Set needed variables
setWorkingNodes(kubeClientset)
podGroup = generatePodGroupName()
daemonsetName = "image-puller-" + service.Name
//Get daemonset definition
daemon := getDaemonset(cfg, service)
//Create daemonset
_, err := kubeClientset.AppsV1().DaemonSets(cfg.ServicesNamespace).Create(context.TODO(), daemon, metav1.CreateOptions{})
if err != nil {
DaemonSetLoggerInfo.Println(err)
return fmt.Errorf("failed to create daemonset: %s", err.Error())
} else {
DaemonSetLoggerInfo.Println("Created daemonset for service:", service.Name)
}
//Set watcher informer
watchPods(kubeClientset, cfg)
return nil
}
//Get daemonset definition
func getDaemonset(cfg *types.Config, service types.Service) *appsv1.DaemonSet {
return &appsv1.DaemonSet{
ObjectMeta: metav1.ObjectMeta{
Name: daemonsetName,
Namespace: cfg.ServicesNamespace,
},
Spec: appsv1.DaemonSetSpec{
Selector: &metav1.LabelSelector{
MatchLabels: map[string]string{
"oscar-resource": "daemonset",
},
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: map[string]string{
"oscar-resource": "daemonset",
"pod-group": podGroup,
},
Name: "podpuller",
},
Spec: corev1.PodSpec{
Volumes: []corev1.Volume{},
ImagePullSecrets: types.SetImagePullSecrets(service.ImagePullSecrets),
Containers: []corev1.Container{
{
Name: "image-puller",
Image: service.Image,
Command: []string{"/bin/sh", "-c", "sleep 1h"},
},
},
},
},
},
}
}
//Watch pods with a Kubernetes Informer
func watchPods(kubeClientset kubernetes.Interface, cfg *types.Config) {
stopper = make(chan struct{})
defer close(stopper)
pc = PodCounter{wnCount: 0}
var optionsFunc internalinterfaces.TweakListOptionsFunc = func(options *metav1.ListOptions) {
labelSelector := labels.Set{
"pod-group": podGroup,
}.AsSelector()
options.LabelSelector = labelSelector.String()
}
sharedInformerOp := informers.WithTweakListOptions(optionsFunc)
factory := informers.NewSharedInformerFactoryWithOptions(kubeClientset, 2*time.Second, informers.WithNamespace(cfg.ServicesNamespace), sharedInformerOp)
podInformer := factory.Core().V1().Pods().Informer()
factory.Start(stopper)
//Wait for all the selected resources to be added to the cache
state := cache.WaitForCacheSync(stopper, podInformer.HasSynced)
if !state {
log.Fatalf("Failed to sync informer cache")
}
//Add event handler that gets all the pods status
podInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
UpdateFunc: handleUpdatePodEvent,
})
<-stopper
//Delete daemonset when all pods are in state "Running"
DaemonSetLoggerInfo.Println("Deleting daemonset...")
err := kubeClientset.AppsV1().DaemonSets(cfg.ServicesNamespace).Delete(context.TODO(), daemonsetName, metav1.DeleteOptions{})
if err != nil {
DaemonSetLoggerInfo.Println(err)
log.Fatalf("Failed to delete daemonset: %s", err.Error())
} else {
DaemonSetLoggerInfo.Println("Deleted daemonset")
}
}
func handleUpdatePodEvent(oldObj interface{}, newObj interface{}) {
newPod := newObj.(*corev1.Pod)
if newPod.Status.Phase == corev1.PodRunning {
pc.mutex.Lock()
defer pc.mutex.Unlock()
pc.wnCount++
//Check the running pods count and stop the informer
if pc.wnCount >= workingNodes {
stopper <- struct{}{}
}
}
}
func setWorkingNodes(kubeClientset kubernetes.Interface) error {
nodes, err := kubeClientset.CoreV1().Nodes().List(context.TODO(), metav1.ListOptions{LabelSelector: "!node-role.kubernetes.io/control-plane,!node-role.kubernetes.io/master"})
if err != nil {
return fmt.Errorf("error getting node list: %v", err)
}
for range nodes.Items {
workingNodes++
}
return nil
}
func generatePodGroupName() string {
b := make([]byte, lengthStr)
for i := range b {
b[i] = letterBytes[rand.Intn(len(letterBytes))]
}
return "pod-group-" + string(b)
}