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controller.go
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controller.go
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package main
import (
"fmt"
"strings"
"time"
"go.uber.org/zap"
"k8s.io/apimachinery/pkg/util/wait"
appsinformers "k8s.io/client-go/informers/apps/v1"
"k8s.io/client-go/kubernetes"
appslisters "k8s.io/client-go/listers/apps/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
type Controller struct {
kubeclientset kubernetes.Interface
deploymentsLister appslisters.DeploymentLister
deploymentsSynced cache.InformerSynced
daemonsetsLister appslisters.DaemonSetLister
daemonsetsSynced cache.InformerSynced
workqueue workqueue.RateLimitingInterface
namespace string
registry string
registryUsername string
registryPassword string
repository string
logger *zap.SugaredLogger
}
func NewController(
clientset kubernetes.Interface,
deploymentInformer appsinformers.DeploymentInformer,
daemonsetInformer appsinformers.DaemonSetInformer,
namespace,
registry,
registryUsername,
registryPassword,
repository string,
logger *zap.SugaredLogger) *Controller {
controller := &Controller{
kubeclientset: clientset,
deploymentsLister: deploymentInformer.Lister(),
deploymentsSynced: deploymentInformer.Informer().HasSynced,
daemonsetsLister: daemonsetInformer.Lister(),
daemonsetsSynced: daemonsetInformer.Informer().HasSynced,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "image-clone-controller"),
namespace: namespace,
registry: registry,
registryUsername: registryUsername,
registryPassword: registryPassword,
repository: repository,
logger: logger,
}
deploymentInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.enqueDeployment,
})
daemonsetInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.enqueDaemonset,
})
return controller
}
// Run will set up the 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(stopCh <-chan struct{}) error {
defer c.workqueue.ShutDown()
c.logger.Infof("Waiting for informer caches to sync")
if ok := cache.WaitForCacheSync(stopCh, c.deploymentsSynced); !ok {
return fmt.Errorf("failed to wait for caches to sync")
}
c.logger.Infof("Starting workers")
go wait.Until(c.runWorker, time.Second, stopCh)
c.logger.Infof("Started workers")
<-stopCh
c.logger.Infof("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
}
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)
c.logger.Error("expected string in workqueue but got %#v", obj)
return nil
}
splitKey := strings.SplitN(key, "/", 2)
objectType := splitKey[0]
objectKey := splitKey[1]
if objectType == "deployment" {
if err := c.deploymentSyncHandler(objectKey); err != nil {
c.workqueue.AddRateLimited(objectKey)
return fmt.Errorf("error syncing '%s': %s, requeuing", objectKey, err.Error())
}
}
if objectType == "daemonset" {
if err := c.daemonsetSyncHandler(objectKey); err != nil {
c.workqueue.AddRateLimited(objectKey)
return fmt.Errorf("error syncing '%s': %s, requeuing", objectKey, err.Error())
}
}
c.workqueue.Forget(obj)
c.logger.Infof("Successfully synced '%s'\n", objectKey)
return nil
}(obj)
if err != nil {
c.logger.Error(err)
return true
}
return true
}
// enqueueDeployment takes a Deployment resource and converts it into a namespace/name
// string which is then put onto the work queue.
func (c *Controller) enqueDeployment(obj interface{}) {
var key string
var err error
if key, err = cache.MetaNamespaceKeyFunc(obj); err != nil {
fmt.Println(err)
}
namespace, _, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
fmt.Println(fmt.Errorf("invalid resource key: %s", key))
}
key = "deployment/" + key
if !strings.Contains(c.namespace, namespace) {
c.workqueue.Add(key)
}
}
// enqueueDaemonset takes a Daemonset resource and converts it into a namespace/name
// string which is then put onto the work queue.
func (c *Controller) enqueDaemonset(obj interface{}) {
var key string
var err error
if key, err = cache.MetaNamespaceKeyFunc(obj); err != nil {
fmt.Println(err)
}
namespace, _, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
fmt.Println(fmt.Errorf("invalid resource key: %s", key))
}
key = "daemonset/" + key
if !strings.Contains(c.namespace, namespace) {
c.workqueue.Add(key)
}
}