/
controller.go
383 lines (336 loc) · 12.4 KB
/
controller.go
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package main
import (
"context"
"fmt"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"time"
clusterv1alpha1 "github.com/spectro30/bookcrd/apis/cluster/v1alpha1"
clientset "github.com/spectro30/bookcrd/client/clientset/versioned"
samplescheme "github.com/spectro30/bookcrd/client/clientset/versioned/scheme"
clusterInformer "github.com/spectro30/bookcrd/client/informers/externalversions/cluster/v1alpha1"
clusterLister "github.com/spectro30/bookcrd/client/listers/cluster/v1alpha1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
appsinformers "k8s.io/client-go/informers/apps/v1"
coreinformers "k8s.io/client-go/informers/core/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
appslisters "k8s.io/client-go/listers/apps/v1"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog"
)
const controllerAgentName = "cluster-controller"
const finalizerName = "finalizer.emon.dev"
type controller struct {
//k8s clientset
kubeClientSet kubernetes.Interface
//this one is for cluster
clusterClientSet clientset.Interface
deploymentsListener appslisters.DeploymentLister
deploymentsSynced cache.InformerSynced
podsListener corelisters.PodLister
podsSynced cache.InformerSynced
clusterLister clusterLister.ClusterLister
clusterSynced cache.InformerSynced
// 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
}
func newController(kubeClientSet kubernetes.Interface,
clusterClientSet clientset.Interface,
deploymentInformer appsinformers.DeploymentInformer,
podInformer coreinformers.PodInformer,
clusterInformer clusterInformer.ClusterInformer) *controller {
// Create event broadcaster
// Add sample-controller types to the default Kubernetes Scheme so Events can be
// logged for sample-controller types.
utilruntime.Must(samplescheme.AddToScheme(scheme.Scheme))
klog.V(4).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(klog.Infof)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeClientSet.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: controllerAgentName})
fmt.Println("Hello There")
controller := &controller{
kubeClientSet: kubeClientSet,
clusterClientSet: clusterClientSet,
deploymentsListener: deploymentInformer.Lister(),
deploymentsSynced: deploymentInformer.Informer().HasSynced,
podsListener: podInformer.Lister(),
podsSynced: podInformer.Informer().HasSynced,
clusterLister: clusterInformer.Lister(),
clusterSynced: clusterInformer.Informer().HasSynced,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "Clusters"),
recorder: recorder,
}
deploymentInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.handleObject,
UpdateFunc: func(oldObj, newObj interface{}) {
controller.handleObject(newObj)
},
DeleteFunc: controller.handleObject,
})
//podInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
// AddFunc: ,
// UpdateFunc: ,
// DeleteFunc: ,
//})
clusterInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
if o, ok := obj.(*clusterv1alpha1.Cluster); ok && o.GetGeneration() > o.Status.ObservedGeneration {
controller.enqueue(obj)
}
},
UpdateFunc: func(oldObj, newObj interface{}) {
controller.enqueue(newObj)
},
DeleteFunc: controller.enqueue,
})
return controller
}
func (c *controller) Run(threadiness int, stopch <-chan struct{}) error {
defer utilruntime.HandleCrash()
defer c.workqueue.ShutDown()
// Start the informer factories to begin populating the informer caches
klog.Info("Starting cluster controller")
// Wait for the caches to be synced before starting workers
klog.Info("Waiting for informer caches to sync")
if ok := cache.WaitForCacheSync(stopch, c.deploymentsSynced, c.podsSynced, c.clusterSynced); !ok {
klog.Info("can't sync cache properly")
return fmt.Errorf("failed to wait for cache sync")
}
//now i need to start workers
for i := 0; i < threadiness; i++ {
go wait.Until(c.runWorker, time.Second, stopch)
}
klog.Info("Started workers to process the queue")
<-stopch
klog.Info("Shutting down workers program has been terminated")
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() {
}
}
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 {
defer c.workqueue.Done(obj)
var key string
var ok bool
if key, ok = obj.(string); !ok {
c.workqueue.Forget(obj)
utilruntime.HandleError(fmt.Errorf("expected string in workqueue but got %#v", obj))
return nil
}
// now need to pass the key to syncHandler
if err := c.syncHandler(key); err != nil {
// put it back again in the queue
c.workqueue.AddRateLimited(key)
return fmt.Errorf("error syncing '%s': %s, requeuing", 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)
klog.Infof("Successfully synced '%s'", key)
return nil
//why put object here????
}(obj)
if err != nil {
utilruntime.HandleError(err)
}
return true
}
func (c *controller) syncHandler(key string) error {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
utilruntime.HandleError(fmt.Errorf("can't retrieve namespace. error : ", err.Error()))
return nil
}
cluster, err := c.clusterLister.Clusters(namespace).Get(name)
if err != nil {
if errors.IsNotFound(err) {
//maybe the resource is no longer available
utilruntime.HandleError(fmt.Errorf("the item can't be finded maybe it's deleted", err.Error()))
return nil
}
return err
}
bookDeploymentName := cluster.Spec.DeploymentName
if bookDeploymentName == "" {
// We choose to absorb the error here as the worker would requeue the
// resource otherwise. Instead, the next time the resource is updated
// the resource will be queued again.
utilruntime.HandleError(fmt.Errorf("%s: deployment name must be specified", key))
return nil
}
bookDeployment, err := c.kubeClientSet.AppsV1().Deployments(namespace).Get(context.TODO(), bookDeploymentName, metav1.GetOptions{})
if errors.IsNotFound(err) {
bookDeployment, err = c.kubeClientSet.AppsV1().Deployments(cluster.Namespace).Create(context.TODO(), newDeployment(cluster), metav1.CreateOptions{})
}
if errors.IsNotFound(err){
_, err = c.kubeClientSet.CoreV1().Services(cluster.Namespace).Create(context.TODO(), newService(cluster), metav1.CreateOptions{})
}
if err != nil {
return err
}
if !metav1.IsControlledBy(bookDeployment, cluster) {
msg := fmt.Sprintf("already Resource Exists", bookDeployment.Name)
c.recorder.Event(cluster, corev1.EventTypeWarning, "ErrResourceExists", msg)
return fmt.Errorf(err.Error())
}
if *bookDeployment.Spec.Replicas != *cluster.Spec.ReplicaCount && cluster.Spec.ReplicaCount != nil {
klog.V(4).Infof("cluster %s replicas: %d, deployment replicas: %d", name, *cluster.Spec.ReplicaCount, *bookDeployment.Spec.Replicas)
bookDeployment, err = c.kubeClientSet.AppsV1().Deployments(namespace).Update(context.TODO(), newDeployment(cluster), metav1.UpdateOptions{})
}
if err != nil {
return err
}
// Finally, we update the status block of the Foo resource to reflect the
// current state of the world
err = c.updateClusterStatus(cluster, bookDeployment)
if err != nil {
return err
}
c.recorder.Event(cluster, corev1.EventTypeNormal, "SuccessSynced", "Message Resource Synced")
return nil
}
func (c *controller) updateClusterStatus(cluster *clusterv1alpha1.Cluster,
bookdeployment *appsv1.Deployment) error {
clusterCopy := cluster.DeepCopy()
if cluster.DeletionTimestamp == nil {
clusterCopy.Status.CurrentReplica = bookdeployment.Status.AvailableReplicas
}
clusterCopy.Status.ObservedGeneration = cluster.ObjectMeta.GetGeneration()
//clusterCopy.Status.ObservedGeneration =
// If the CustomResourceSubresources feature gate is not enabled,
// we must use Update instead of UpdateStatus to update the Status block of the Foo resource.
// UpdateStatus will not allow changes to the Spec of the resource,
// which is ideal for ensuring nothing other than resource status has been updated.
_, err := c.clusterClientSet.ClusterV1alpha1().Clusters(cluster.Namespace).Update(context.TODO(), clusterCopy, metav1.UpdateOptions{})
return err
}
// handleObject will take any resource implementing metav1.Object and attempt
// to find the Foo resource that 'owns' it. It does this by looking at the
// objects metadata.ownerReferences field for an appropriate OwnerReference.
// It then enqueues that Foo resource to be processed. If the object does not
// have an appropriate OwnerReference, it will simply be skipped.
func (c *controller) handleObject(obj interface{}) {
var object metav1.Object
var ok bool
if object, ok = obj.(metav1.Object); !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
utilruntime.HandleError(fmt.Errorf("error decoding object, invalid type"))
return
}
object, ok = tombstone.Obj.(metav1.Object)
if !ok {
utilruntime.HandleError(fmt.Errorf("error decoding object tombstone, invalid type"))
return
}
klog.V(4).Infof("Recovered deleted object '%s' from tombstone", object.GetName())
}
klog.V(4).Infof("Processing object: %s", object.GetName())
if ownerRef := metav1.GetControllerOf(object); ownerRef != nil {
// If this object is not owned by a Foo, we should not do anything more
// with it.
if ownerRef.Kind != "cluster" {
return
}
cluster, err := c.clusterLister.Clusters(object.GetNamespace()).Get(ownerRef.Name)
if err != nil {
klog.V(4).Infof("ignoring orphaned object '%s' of cluster '%s'", object.GetSelfLink(), ownerRef.Name)
return
}
c.enqueue(cluster)
return
}
}
func (c *controller) enqueue(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
utilruntime.HandleError(err)
return
}
c.workqueue.Add(key)
}
// newDeployment creates a new Deployment for a Foo resource. It also sets
// the appropriate OwnerReferences on the resource so handleObject can discover
// the Foo resource that 'owns' it.
func newDeployment(cluster *clusterv1alpha1.Cluster) *appsv1.Deployment {
labels := map[string]string{
"app": "book-server",
"controller": cluster.Name,
}
return &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: cluster.Name,
Namespace: cluster.Namespace,
OwnerReferences: []metav1.OwnerReference{
*metav1.NewControllerRef(cluster, clusterv1alpha1.SchemeGroupVersion.WithKind("Cluster")),
},
},
Spec: appsv1.DeploymentSpec{
Replicas: cluster.Spec.ReplicaCount,
Selector: &metav1.LabelSelector{
MatchLabels: labels,
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: labels,
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{
{
Name: "book-server",
Image: "spectro30/bookapp:latest",
},
},
},
},
},
}
}
func newService (cluster *clusterv1alpha1.Cluster) *corev1.Service{
return &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: "bookcrd",
},
Spec: corev1.ServiceSpec{
Selector: map[string]string{
"app": "bookapp",
},
Type: corev1.ServiceTypeNodePort,
Ports: []corev1.ServicePort{
{
Port: 80,
TargetPort: intstr.IntOrString{
IntVal: 8888,
},
},
},
},
}
}