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controller.go
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controller.go
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package controller
import (
"fmt"
"time"
"github.com/christopherhein/eniconfig-controller/pkg/config"
"github.com/golang/glog"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
coreinformers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/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/retry"
"k8s.io/client-go/util/workqueue"
)
const controllerAgentName = "eniconfig-controller"
const annotationName = "k8s.amazonaws.com/eniConfig"
// Controller is the controller implementation for Foo resources
type controller struct {
// kubeclientset is a standard kubernetes clientset
kubeclientset kubernetes.Interface
nodesLister corelisters.NodeLister
nodesSynced cache.InformerSynced
conf config.Config
// 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
}
// New returns a new sample controller
func New(
kubeclientset kubernetes.Interface,
nodeInformer coreinformers.NodeInformer,
conf config.Config) *controller {
// Create event broadcaster
// Add sample-controller types to the default Kubernetes Scheme so Events can be
// logged for sample-controller types.
glog.V(4).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.Infof)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeclientset.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: controllerAgentName})
ctrl := &controller{
kubeclientset: kubeclientset,
nodesLister: nodeInformer.Lister(),
nodesSynced: nodeInformer.Informer().HasSynced,
conf: conf,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "Foos"),
recorder: recorder,
}
glog.Info("Setting up event handlers")
nodeInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ctrl.handleObject,
UpdateFunc: func(old, new interface{}) {
newNode := new.(*corev1.Node)
oldNode := old.(*corev1.Node)
if newNode.ResourceVersion == oldNode.ResourceVersion {
// Periodic resync will send update events for all known Deployments.
// Two different versions of the same Deployment will always have different RVs.
return
}
ctrl.handleObject(new)
},
DeleteFunc: ctrl.handleObject,
})
return ctrl
}
// 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()
// Wait for the caches to be synced before starting workers
glog.Info("waiting for informer caches to sync")
if ok := cache.WaitForCacheSync(stopCh, c.nodesSynced); !ok {
return fmt.Errorf("failed to wait for caches to sync")
}
glog.Info("starting workers")
// Launch two workers to process Foo resources
for i := 0; i < threadiness; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
glog.Info("started workers")
<-stopCh
glog.Info("shutting down workers")
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
}
// Finally, if no error occurs we Forget this item so it does not
// get queued again until another change happens.
c.workqueue.Forget(obj)
glog.Infof("successfully synced '%s'", key)
return nil
}(obj)
if err != nil {
runtime.HandleError(err)
return true
}
return true
}
// 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 {
runtime.HandleError(fmt.Errorf("error decoding object, invalid type"))
return
}
object, ok = tombstone.Obj.(metav1.Object)
if !ok {
runtime.HandleError(fmt.Errorf("error decoding object tombstone, invalid type"))
return
}
glog.V(4).Infof("recovered deleted object '%s' from tombstone", object.GetName())
}
glog.V(4).Infof("processing object: %s", object.GetName())
retryErr := retry.RetryOnConflict(retry.DefaultRetry, func() error {
node, err := c.kubeclientset.Core().Nodes().Get(object.GetName(), metav1.GetOptions{})
if err != nil {
return err
}
nodeCopy := node.DeepCopy()
eniConfigName, err := c.conf.GetName(nodeCopy.Spec.ProviderID)
if err != nil {
return err
}
nodeCopy.ResourceVersion = ""
nodeCopy.Annotations[annotationName] = eniConfigName
_, err = c.kubeclientset.Core().Nodes().Update(nodeCopy)
if err != nil {
return err
}
return nil
})
if retryErr != nil {
runtime.HandleError(fmt.Errorf("Error updating node object %s", retryErr.Error()))
return
}
return
}