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Merge pull request #206 from grycap/devel
Added image cache functionality
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,200 @@ | ||
| /* | ||
| 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 | ||
|
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||
| 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) | ||
|
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| //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) | ||
|
|
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| return nil | ||
| } | ||
|
|
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| //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) | ||
|
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| pc = PodCounter{wnCount: 0} | ||
|
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| var optionsFunc internalinterfaces.TweakListOptionsFunc = func(options *metav1.ListOptions) { | ||
| labelSelector := labels.Set{ | ||
| "pod-group": podGroup, | ||
| }.AsSelector() | ||
| options.LabelSelector = labelSelector.String() | ||
| } | ||
|
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| sharedInformerOp := informers.WithTweakListOptions(optionsFunc) | ||
|
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| factory := informers.NewSharedInformerFactoryWithOptions(kubeClientset, 2*time.Second, informers.WithNamespace(cfg.ServicesNamespace), sharedInformerOp) | ||
| //factory := informers.NewSharedInformerFactory(kubeClientset, 2*time.Second) | ||
|
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| 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, | ||
| }) | ||
|
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| <-stopper | ||
|
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| //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 | ||
| } | ||
|
|
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| func generatePodGroupName() string { | ||
| b := make([]byte, lengthStr) | ||
| for i := range b { | ||
| b[i] = letterBytes[rand.Intn(len(letterBytes))] | ||
| } | ||
| return "pod-group-" + string(b) | ||
| } |
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